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/**
* Muuri v0.9.1
* https://muuri.dev/
* Copyright (c) 2015-present, Haltu Oy
* Released under the MIT license
* https://github.com/haltu/muuri/blob/master/LICENSE.md
* @license MIT
*
* Muuri Packer
* Copyright (c) 2016-present, Niklas Rämö <inramo@gmail.com>
* @license MIT
*
* Muuri Ticker / Muuri Emitter / Muuri Dragger
* Copyright (c) 2018-present, Niklas Rämö <inramo@gmail.com>
* @license MIT
*
* Muuri AutoScroller
* Copyright (c) 2019-present, Niklas Rämö <inramo@gmail.com>
* @license MIT
*/
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global = global || self, global.Muuri = factory());
}(this, (function () { 'use strict';
var GRID_INSTANCES = {};
var ITEM_ELEMENT_MAP = typeof Map === 'function' ? new Map() : null;
var ACTION_SWAP = 'swap';
var ACTION_MOVE = 'move';
var EVENT_SYNCHRONIZE = 'synchronize';
var EVENT_LAYOUT_START = 'layoutStart';
var EVENT_LAYOUT_END = 'layoutEnd';
var EVENT_LAYOUT_ABORT = 'layoutAbort';
var EVENT_ADD = 'add';
var EVENT_REMOVE = 'remove';
var EVENT_SHOW_START = 'showStart';
var EVENT_SHOW_END = 'showEnd';
var EVENT_HIDE_START = 'hideStart';
var EVENT_HIDE_END = 'hideEnd';
var EVENT_FILTER = 'filter';
var EVENT_SORT = 'sort';
var EVENT_MOVE = 'move';
var EVENT_SEND = 'send';
var EVENT_BEFORE_SEND = 'beforeSend';
var EVENT_RECEIVE = 'receive';
var EVENT_BEFORE_RECEIVE = 'beforeReceive';
var EVENT_DRAG_INIT = 'dragInit';
var EVENT_DRAG_START = 'dragStart';
var EVENT_DRAG_MOVE = 'dragMove';
var EVENT_DRAG_SCROLL = 'dragScroll';
var EVENT_DRAG_END = 'dragEnd';
var EVENT_DRAG_RELEASE_START = 'dragReleaseStart';
var EVENT_DRAG_RELEASE_END = 'dragReleaseEnd';
var EVENT_DESTROY = 'destroy';
var HAS_TOUCH_EVENTS = 'ontouchstart' in window;
var HAS_POINTER_EVENTS = !!window.PointerEvent;
var HAS_MS_POINTER_EVENTS = !!window.navigator.msPointerEnabled;
var MAX_SAFE_FLOAT32_INTEGER = 16777216;
/**
* Event emitter constructor.
*
* @class
*/
function Emitter() {
this._events = {};
this._queue = [];
this._counter = 0;
this._clearOnEmit = false;
}
/**
* Public prototype methods
* ************************
*/
/**
* Bind an event listener.
*
* @public
* @param {String} event
* @param {Function} listener
* @returns {Emitter}
*/
Emitter.prototype.on = function (event, listener) {
if (!this._events || !event || !listener) return this;
// Get listeners queue and create it if it does not exist.
var listeners = this._events[event];
if (!listeners) listeners = this._events[event] = [];
// Add the listener to the queue.
listeners.push(listener);
return this;
};
/**
* Unbind all event listeners that match the provided listener function.
*
* @public
* @param {String} event
* @param {Function} listener
* @returns {Emitter}
*/
Emitter.prototype.off = function (event, listener) {
if (!this._events || !event || !listener) return this;
// Get listeners and return immediately if none is found.
var listeners = this._events[event];
if (!listeners || !listeners.length) return this;
// Remove all matching listeners.
var index;
while ((index = listeners.indexOf(listener)) !== -1) {
listeners.splice(index, 1);
}
return this;
};
/**
* Unbind all listeners of the provided event.
*
* @public
* @param {String} event
* @returns {Emitter}
*/
Emitter.prototype.clear = function (event) {
if (!this._events || !event) return this;
var listeners = this._events[event];
if (listeners) {
listeners.length = 0;
delete this._events[event];
}
return this;
};
/**
* Emit all listeners in a specified event with the provided arguments.
*
* @public
* @param {String} event
* @param {...*} [args]
* @returns {Emitter}
*/
Emitter.prototype.emit = function (event) {
if (!this._events || !event) {
this._clearOnEmit = false;
return this;
}
// Get event listeners and quit early if there's no listeners.
var listeners = this._events[event];
if (!listeners || !listeners.length) {
this._clearOnEmit = false;
return this;
}
var queue = this._queue;
var startIndex = queue.length;
var argsLength = arguments.length - 1;
var args;
// If we have more than 3 arguments let's put the arguments in an array and
// apply it to the listeners.
if (argsLength > 3) {
args = [];
args.push.apply(args, arguments);
args.shift();
}
// Add the current listeners to the callback queue before we process them.
// This is necessary to guarantee that all of the listeners are called in
// correct order even if new event listeners are removed/added during
// processing and/or events are emitted during processing.
queue.push.apply(queue, listeners);
// Reset the event's listeners if need be.
if (this._clearOnEmit) {
listeners.length = 0;
this._clearOnEmit = false;
}
// Increment queue counter. This is needed for the scenarios where emit is
// triggered while the queue is already processing. We need to keep track of
// how many "queue processors" there are active so that we can safely reset
// the queue in the end when the last queue processor is finished.
++this._counter;
// Process the queue (the specific part of it for this emit).
var i = startIndex;
var endIndex = queue.length;
for (; i < endIndex; i++) {
// prettier-ignore
argsLength === 0 ? queue[i]() :
argsLength === 1 ? queue[i](arguments[1]) :
argsLength === 2 ? queue[i](arguments[1], arguments[2]) :
argsLength === 3 ? queue[i](arguments[1], arguments[2], arguments[3]) :
queue[i].apply(null, args);
// Stop processing if the emitter is destroyed.
if (!this._events) return this;
}
// Decrement queue process counter.
--this._counter;
// Reset the queue if there are no more queue processes running.
if (!this._counter) queue.length = 0;
return this;
};
/**
* Emit all listeners in a specified event with the provided arguments and
* remove the event's listeners just before calling the them. This method allows
* the emitter to serve as a queue where all listeners are called only once.
*
* @public
* @param {String} event
* @param {...*} [args]
* @returns {Emitter}
*/
Emitter.prototype.burst = function () {
if (!this._events) return this;
this._clearOnEmit = true;
this.emit.apply(this, arguments);
return this;
};
/**
* Check how many listeners there are for a specific event.
*
* @public
* @param {String} event
* @returns {Boolean}
*/
Emitter.prototype.countListeners = function (event) {
if (!this._events) return 0;
var listeners = this._events[event];
return listeners ? listeners.length : 0;
};
/**
* Destroy emitter instance. Basically just removes all bound listeners.
*
* @public
* @returns {Emitter}
*/
Emitter.prototype.destroy = function () {
if (!this._events) return this;
this._queue.length = this._counter = 0;
this._events = null;
return this;
};
var pointerout = HAS_POINTER_EVENTS ? 'pointerout' : HAS_MS_POINTER_EVENTS ? 'MSPointerOut' : '';
var waitDuration = 100;
/**
* If you happen to use Edge or IE on a touch capable device there is a
* a specific case where pointercancel and pointerend events are never emitted,
* even though one them should always be emitted when you release your finger
* from the screen. The bug appears specifically when Muuri shifts the dragged
* element's position in the DOM after pointerdown event, IE and Edge don't like
* that behaviour and quite often forget to emit the pointerend/pointercancel
* event. But, they do emit pointerout event so we utilize that here.
* Specifically, if there has been no pointermove event within 100 milliseconds
* since the last pointerout event we force cancel the drag operation. This hack
* works surprisingly well 99% of the time. There is that 1% chance there still
* that dragged items get stuck but it is what it is.
*
* @class
* @param {Dragger} dragger
*/
function EdgeHack(dragger) {
if (!pointerout) return;
this._dragger = dragger;
this._timeout = null;
this._outEvent = null;
this._isActive = false;
this._addBehaviour = this._addBehaviour.bind(this);
this._removeBehaviour = this._removeBehaviour.bind(this);
this._onTimeout = this._onTimeout.bind(this);
this._resetData = this._resetData.bind(this);
this._onStart = this._onStart.bind(this);
this._onOut = this._onOut.bind(this);
this._dragger.on('start', this._onStart);
}
/**
* @private
*/
EdgeHack.prototype._addBehaviour = function () {
if (this._isActive) return;
this._isActive = true;
this._dragger.on('move', this._resetData);
this._dragger.on('cancel', this._removeBehaviour);
this._dragger.on('end', this._removeBehaviour);
window.addEventListener(pointerout, this._onOut);
};
/**
* @private
*/
EdgeHack.prototype._removeBehaviour = function () {
if (!this._isActive) return;
this._dragger.off('move', this._resetData);
this._dragger.off('cancel', this._removeBehaviour);
this._dragger.off('end', this._removeBehaviour);
window.removeEventListener(pointerout, this._onOut);
this._resetData();
this._isActive = false;
};
/**
* @private
*/
EdgeHack.prototype._resetData = function () {
window.clearTimeout(this._timeout);
this._timeout = null;
this._outEvent = null;
};
/**
* @private
* @param {(PointerEvent|TouchEvent|MouseEvent)} e
*/
EdgeHack.prototype._onStart = function (e) {
if (e.pointerType === 'mouse') return;
this._addBehaviour();
};
/**
* @private
* @param {(PointerEvent|TouchEvent|MouseEvent)} e
*/
EdgeHack.prototype._onOut = function (e) {
if (!this._dragger._getTrackedTouch(e)) return;
this._resetData();
this._outEvent = e;
this._timeout = window.setTimeout(this._onTimeout, waitDuration);
};
/**
* @private
*/
EdgeHack.prototype._onTimeout = function () {
var e = this._outEvent;
this._resetData();
if (this._dragger.isActive()) this._dragger._onCancel(e);
};
/**
* @public
*/
EdgeHack.prototype.destroy = function () {
if (!pointerout) return;
this._dragger.off('start', this._onStart);
this._removeBehaviour();
};
// Playing it safe here, test all potential prefixes capitalized and lowercase.
var vendorPrefixes = ['', 'webkit', 'moz', 'ms', 'o', 'Webkit', 'Moz', 'MS', 'O'];
var cache = {};
/**
* Get prefixed CSS property name when given a non-prefixed CSS property name.
* Returns null if the property is not supported at all.
*
* @param {CSSStyleDeclaration} style
* @param {String} prop
* @returns {String}
*/
function getPrefixedPropName(style, prop) {
var prefixedProp = cache[prop] || '';
if (prefixedProp) return prefixedProp;
var camelProp = prop[0].toUpperCase() + prop.slice(1);
var i = 0;
while (i < vendorPrefixes.length) {
prefixedProp = vendorPrefixes[i] ? vendorPrefixes[i] + camelProp : prop;
if (prefixedProp in style) {
cache[prop] = prefixedProp;
return prefixedProp;
}
++i;
}
return '';
}
/**
* Check if passive events are supported.
* https://github.com/WICG/EventListenerOptions/blob/gh-pages/explainer.md#feature-detection
*
* @returns {Boolean}
*/
function hasPassiveEvents() {
var isPassiveEventsSupported = false;
try {
var passiveOpts = Object.defineProperty({}, 'passive', {
get: function () {
isPassiveEventsSupported = true;
},
});
window.addEventListener('testPassive', null, passiveOpts);
window.removeEventListener('testPassive', null, passiveOpts);
} catch (e) {}
return isPassiveEventsSupported;
}
var ua = window.navigator.userAgent.toLowerCase();
var isEdge = ua.indexOf('edge') > -1;
var isIE = ua.indexOf('trident') > -1;
var isFirefox = ua.indexOf('firefox') > -1;
var isAndroid = ua.indexOf('android') > -1;
var listenerOptions = hasPassiveEvents() ? { passive: true } : false;
var taProp = 'touchAction';
var taPropPrefixed = getPrefixedPropName(document.documentElement.style, taProp);
var taDefaultValue = 'auto';
/**
* Creates a new Dragger instance for an element.
*
* @public
* @class
* @param {HTMLElement} element
* @param {Object} [cssProps]
*/
function Dragger(element, cssProps) {
this._element = element;
this._emitter = new Emitter();
this._isDestroyed = false;
this._cssProps = {};
this._touchAction = '';
this._isActive = false;
this._pointerId = null;
this._startTime = 0;
this._startX = 0;
this._startY = 0;
this._currentX = 0;
this._currentY = 0;
this._onStart = this._onStart.bind(this);
this._onMove = this._onMove.bind(this);
this._onCancel = this._onCancel.bind(this);
this._onEnd = this._onEnd.bind(this);
// Can't believe had to build a freaking class for a hack!
this._edgeHack = null;
if ((isEdge || isIE) && (HAS_POINTER_EVENTS || HAS_MS_POINTER_EVENTS)) {
this._edgeHack = new EdgeHack(this);
}
// Apply initial CSS props.
this.setCssProps(cssProps);
// If touch action was not provided with initial CSS props let's assume it's
// auto.
if (!this._touchAction) {
this.setTouchAction(taDefaultValue);
}
// Prevent native link/image dragging for the item and it's children.
element.addEventListener('dragstart', Dragger._preventDefault, false);
// Listen to start event.
element.addEventListener(Dragger._inputEvents.start, this._onStart, listenerOptions);
}
/**
* Protected properties
* ********************
*/
Dragger._pointerEvents = {
start: 'pointerdown',
move: 'pointermove',
cancel: 'pointercancel',
end: 'pointerup',
};
Dragger._msPointerEvents = {
start: 'MSPointerDown',
move: 'MSPointerMove',
cancel: 'MSPointerCancel',
end: 'MSPointerUp',
};
Dragger._touchEvents = {
start: 'touchstart',
move: 'touchmove',
cancel: 'touchcancel',
end: 'touchend',
};
Dragger._mouseEvents = {
start: 'mousedown',
move: 'mousemove',
cancel: '',
end: 'mouseup',
};
Dragger._inputEvents = (function () {
if (HAS_TOUCH_EVENTS) return Dragger._touchEvents;
if (HAS_POINTER_EVENTS) return Dragger._pointerEvents;
if (HAS_MS_POINTER_EVENTS) return Dragger._msPointerEvents;
return Dragger._mouseEvents;
})();
Dragger._emitter = new Emitter();
Dragger._emitterEvents = {
start: 'start',
move: 'move',
end: 'end',
cancel: 'cancel',
};
Dragger._activeInstances = [];
/**
* Protected static methods
* ************************
*/
Dragger._preventDefault = function (e) {
if (e.preventDefault && e.cancelable !== false) e.preventDefault();
};
Dragger._activateInstance = function (instance) {
var index = Dragger._activeInstances.indexOf(instance);
if (index > -1) return;
Dragger._activeInstances.push(instance);
Dragger._emitter.on(Dragger._emitterEvents.move, instance._onMove);
Dragger._emitter.on(Dragger._emitterEvents.cancel, instance._onCancel);
Dragger._emitter.on(Dragger._emitterEvents.end, instance._onEnd);
if (Dragger._activeInstances.length === 1) {
Dragger._bindListeners();
}
};
Dragger._deactivateInstance = function (instance) {
var index = Dragger._activeInstances.indexOf(instance);
if (index === -1) return;
Dragger._activeInstances.splice(index, 1);
Dragger._emitter.off(Dragger._emitterEvents.move, instance._onMove);
Dragger._emitter.off(Dragger._emitterEvents.cancel, instance._onCancel);
Dragger._emitter.off(Dragger._emitterEvents.end, instance._onEnd);
if (!Dragger._activeInstances.length) {
Dragger._unbindListeners();
}
};
Dragger._bindListeners = function () {
window.addEventListener(Dragger._inputEvents.move, Dragger._onMove, listenerOptions);
window.addEventListener(Dragger._inputEvents.end, Dragger._onEnd, listenerOptions);
if (Dragger._inputEvents.cancel) {
window.addEventListener(Dragger._inputEvents.cancel, Dragger._onCancel, listenerOptions);
}
};
Dragger._unbindListeners = function () {
window.removeEventListener(Dragger._inputEvents.move, Dragger._onMove, listenerOptions);
window.removeEventListener(Dragger._inputEvents.end, Dragger._onEnd, listenerOptions);
if (Dragger._inputEvents.cancel) {
window.removeEventListener(Dragger._inputEvents.cancel, Dragger._onCancel, listenerOptions);
}
};
Dragger._getEventPointerId = function (event) {
// If we have pointer id available let's use it.
if (typeof event.pointerId === 'number') {
return event.pointerId;
}
// For touch events let's get the first changed touch's identifier.
if (event.changedTouches) {
return event.changedTouches[0] ? event.changedTouches[0].identifier : null;
}
// For mouse/other events let's provide a static id.
return 1;
};
Dragger._getTouchById = function (event, id) {
// If we have a pointer event return the whole event if there's a match, and
// null otherwise.
if (typeof event.pointerId === 'number') {
return event.pointerId === id ? event : null;
}
// For touch events let's check if there's a changed touch object that matches
// the pointerId in which case return the touch object.
if (event.changedTouches) {
for (var i = 0; i < event.changedTouches.length; i++) {
if (event.changedTouches[i].identifier === id) {
return event.changedTouches[i];
}
}
return null;
}
// For mouse/other events let's assume there's only one pointer and just
// return the event.
return event;
};
Dragger._onMove = function (e) {
Dragger._emitter.emit(Dragger._emitterEvents.move, e);
};
Dragger._onCancel = function (e) {
Dragger._emitter.emit(Dragger._emitterEvents.cancel, e);
};
Dragger._onEnd = function (e) {
Dragger._emitter.emit(Dragger._emitterEvents.end, e);
};
/**
* Private prototype methods
* *************************
*/
/**
* Reset current drag operation (if any).
*
* @private
*/
Dragger.prototype._reset = function () {
this._pointerId = null;
this._startTime = 0;
this._startX = 0;
this._startY = 0;
this._currentX = 0;
this._currentY = 0;
this._isActive = false;
Dragger._deactivateInstance(this);
};
/**
* Create a custom dragger event from a raw event.
*
* @private
* @param {String} type
* @param {(PointerEvent|TouchEvent|MouseEvent)} e
* @returns {Object}
*/
Dragger.prototype._createEvent = function (type, e) {
var touch = this._getTrackedTouch(e);
return {
// Hammer.js compatibility interface.
type: type,
srcEvent: e,
distance: this.getDistance(),
deltaX: this.getDeltaX(),
deltaY: this.getDeltaY(),
deltaTime: type === Dragger._emitterEvents.start ? 0 : this.getDeltaTime(),
isFirst: type === Dragger._emitterEvents.start,
isFinal: type === Dragger._emitterEvents.end || type === Dragger._emitterEvents.cancel,
pointerType: e.pointerType || (e.touches ? 'touch' : 'mouse'),
// Partial Touch API interface.
identifier: this._pointerId,
screenX: touch.screenX,
screenY: touch.screenY,
clientX: touch.clientX,
clientY: touch.clientY,
pageX: touch.pageX,
pageY: touch.pageY,
target: touch.target,
};
};
/**
* Emit a raw event as dragger event internally.
*
* @private
* @param {String} type
* @param {(PointerEvent|TouchEvent|MouseEvent)} e
*/
Dragger.prototype._emit = function (type, e) {
this._emitter.emit(type, this._createEvent(type, e));
};
/**
* If the provided event is a PointerEvent this method will return it if it has
* the same pointerId as the instance. If the provided event is a TouchEvent
* this method will try to look for a Touch instance in the changedTouches that
* has an identifier matching this instance's pointerId. If the provided event
* is a MouseEvent (or just any other event than PointerEvent or TouchEvent)
* it will be returned immediately.
*
* @private
* @param {(PointerEvent|TouchEvent|MouseEvent)} e
* @returns {?(Touch|PointerEvent|MouseEvent)}
*/
Dragger.prototype._getTrackedTouch = function (e) {
if (this._pointerId === null) return null;
return Dragger._getTouchById(e, this._pointerId);
};
/**
* Handler for start event.
*
* @private
* @param {(PointerEvent|TouchEvent|MouseEvent)} e
*/
Dragger.prototype._onStart = function (e) {
if (this._isDestroyed) return;
// If pointer id is already assigned let's return early.
if (this._pointerId !== null) return;
// Get (and set) pointer id.
this._pointerId = Dragger._getEventPointerId(e);
if (this._pointerId === null) return;
// Setup initial data and emit start event.
var touch = this._getTrackedTouch(e);
this._startX = this._currentX = touch.clientX;
this._startY = this._currentY = touch.clientY;
this._startTime = Date.now();
this._isActive = true;
this._emit(Dragger._emitterEvents.start, e);
// If the drag procedure was not reset within the start procedure let's
// activate the instance (start listening to move/cancel/end events).
if (this._isActive) {
Dragger._activateInstance(this);
}
};
/**
* Handler for move event.
*
* @private
* @param {(PointerEvent|TouchEvent|MouseEvent)} e
*/
Dragger.prototype._onMove = function (e) {
var touch = this._getTrackedTouch(e);
if (!touch) return;
this._currentX = touch.clientX;
this._currentY = touch.clientY;
this._emit(Dragger._emitterEvents.move, e);
};
/**
* Handler for cancel event.
*
* @private
* @param {(PointerEvent|TouchEvent|MouseEvent)} e
*/
Dragger.prototype._onCancel = function (e) {
if (!this._getTrackedTouch(e)) return;
this._emit(Dragger._emitterEvents.cancel, e);
this._reset();
};
/**
* Handler for end event.
*
* @private
* @param {(PointerEvent|TouchEvent|MouseEvent)} e
*/
Dragger.prototype._onEnd = function (e) {
if (!this._getTrackedTouch(e)) return;
this._emit(Dragger._emitterEvents.end, e);
this._reset();
};
/**
* Public prototype methods
* ************************
*/
/**
* Check if the element is being dragged at the moment.
*
* @public
* @returns {Boolean}
*/
Dragger.prototype.isActive = function () {
return this._isActive;
};
/**
* Set element's touch-action CSS property.
*
* @public
* @param {String} value
*/
Dragger.prototype.setTouchAction = function (value) {
// Store unmodified touch action value (we trust user input here).
this._touchAction = value;
// Set touch-action style.
if (taPropPrefixed) {
this._cssProps[taPropPrefixed] = '';
this._element.style[taPropPrefixed] = value;
}
// If we have an unsupported touch-action value let's add a special listener
// that prevents default action on touch start event. A dirty hack, but best
// we can do for now. The other options would be to somehow polyfill the
// unsupported touch action behavior with custom heuristics which sounds like
// a can of worms. We do a special exception here for Firefox Android which's
// touch-action does not work properly if the dragged element is moved in the
// the DOM tree on touchstart.
if (HAS_TOUCH_EVENTS) {
this._element.removeEventListener(Dragger._touchEvents.start, Dragger._preventDefault, true);
if (this._element.style[taPropPrefixed] !== value || (isFirefox && isAndroid)) {
this._element.addEventListener(Dragger._touchEvents.start, Dragger._preventDefault, true);
}
}
};
/**
* Update element's CSS properties. Accepts an object with camel cased style
* props with value pairs as it's first argument.
*
* @public
* @param {Object} [newProps]
*/
Dragger.prototype.setCssProps = function (newProps) {
if (!newProps) return;
var currentProps = this._cssProps;
var element = this._element;
var prop;
var prefixedProp;
// Reset current props.
for (prop in currentProps) {
element.style[prop] = currentProps[prop];
delete currentProps[prop];
}
// Set new props.
for (prop in newProps) {
// Make sure we have a value for the prop.
if (!newProps[prop]) continue;
// Special handling for touch-action.
if (prop === taProp) {
this.setTouchAction(newProps[prop]);
continue;
}
// Get prefixed prop and skip if it does not exist.
prefixedProp = getPrefixedPropName(element.style, prop);
if (!prefixedProp) continue;
// Store the prop and add the style.
currentProps[prefixedProp] = '';
element.style[prefixedProp] = newProps[prop];
}
};
/**
* How much the pointer has moved on x-axis from start position, in pixels.
* Positive value indicates movement from left to right.
*
* @public
* @returns {Number}
*/
Dragger.prototype.getDeltaX = function () {
return this._currentX - this._startX;
};
/**
* How much the pointer has moved on y-axis from start position, in pixels.
* Positive value indicates movement from top to bottom.
*
* @public
* @returns {Number}
*/
Dragger.prototype.getDeltaY = function () {
return this._currentY - this._startY;
};
/**
* How far (in pixels) has pointer moved from start position.
*
* @public
* @returns {Number}
*/
Dragger.prototype.getDistance = function () {
var x = this.getDeltaX();
var y = this.getDeltaY();
return Math.sqrt(x * x + y * y);
};
/**
* How long has pointer been dragged.
*
* @public
* @returns {Number}
*/
Dragger.prototype.getDeltaTime = function () {
return this._startTime ? Date.now() - this._startTime : 0;
};
/**
* Bind drag event listeners.
*
* @public
* @param {String} eventName
* - 'start', 'move', 'cancel' or 'end'.
* @param {Function} listener
*/
Dragger.prototype.on = function (eventName, listener) {
this._emitter.on(eventName, listener);
};
/**
* Unbind drag event listeners.
*
* @public
* @param {String} eventName
* - 'start', 'move', 'cancel' or 'end'.
* @param {Function} listener
*/
Dragger.prototype.off = function (eventName, listener) {
this._emitter.off(eventName, listener);
};
/**
* Destroy the instance and unbind all drag event listeners.
*
* @public
*/
Dragger.prototype.destroy = function () {
if (this._isDestroyed) return;
var element = this._element;
if (this._edgeHack) this._edgeHack.destroy();
// Reset data and deactivate the instance.
this._reset();
// Destroy emitter.
this._emitter.destroy();
// Unbind event handlers.
element.removeEventListener(Dragger._inputEvents.start, this._onStart, listenerOptions);
element.removeEventListener('dragstart', Dragger._preventDefault, false);
element.removeEventListener(Dragger._touchEvents.start, Dragger._preventDefault, true);
// Reset styles.
for (var prop in this._cssProps) {
element.style[prop] = this._cssProps[prop];
delete this._cssProps[prop];
}
// Reset data.
this._element = null;
// Mark as destroyed.
this._isDestroyed = true;
};
var dt = 1000 / 60;
var raf = (
window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function (callback) {
return this.setTimeout(function () {
callback(Date.now());
}, dt);
}
).bind(window);
/**
* A ticker system for handling DOM reads and writes in an efficient way.
*
* @class
*/
function Ticker(numLanes) {
this._nextStep = null;
this._lanes = [];
this._stepQueue = [];
this._stepCallbacks = {};
this._step = this._step.bind(this);
for (var i = 0; i < numLanes; i++) {
this._lanes.push(new TickerLane());
}
}
Ticker.prototype._step = function (time) {
var lanes = this._lanes;
var stepQueue = this._stepQueue;
var stepCallbacks = this._stepCallbacks;
var i, j, id, laneQueue, laneCallbacks, laneIndices;
this._nextStep = null;
for (i = 0; i < lanes.length; i++) {
laneQueue = lanes[i].queue;
laneCallbacks = lanes[i].callbacks;
laneIndices = lanes[i].indices;
for (j = 0; j < laneQueue.length; j++) {
id = laneQueue[j];
if (!id) continue;
stepQueue.push(id);
stepCallbacks[id] = laneCallbacks[id];
delete laneCallbacks[id];
delete laneIndices[id];
}
laneQueue.length = 0;
}
for (i = 0; i < stepQueue.length; i++) {
id = stepQueue[i];
if (stepCallbacks[id]) stepCallbacks[id](time);
delete stepCallbacks[id];
}
stepQueue.length = 0;
};
Ticker.prototype.add = function (laneIndex, id, callback) {
this._lanes[laneIndex].add(id, callback);
if (!this._nextStep) this._nextStep = raf(this._step);
};
Ticker.prototype.remove = function (laneIndex, id) {
this._lanes[laneIndex].remove(id);
};
/**
* A lane for ticker.
*
* @class
*/
function TickerLane() {
this.queue = [];
this.indices = {};
this.callbacks = {};
}
TickerLane.prototype.add = function (id, callback) {
var index = this.indices[id];
if (index !== undefined) this.queue[index] = undefined;
this.queue.push(id);
this.callbacks[id] = callback;
this.indices[id] = this.queue.length - 1;
};
TickerLane.prototype.remove = function (id) {
var index = this.indices[id];
if (index === undefined) return;
this.queue[index] = undefined;
delete this.callbacks[id];
delete this.indices[id];
};
var LAYOUT_READ = 'layoutRead';
var LAYOUT_WRITE = 'layoutWrite';
var VISIBILITY_READ = 'visibilityRead';
var VISIBILITY_WRITE = 'visibilityWrite';
var DRAG_START_READ = 'dragStartRead';
var DRAG_START_WRITE = 'dragStartWrite';
var DRAG_MOVE_READ = 'dragMoveRead';
var DRAG_MOVE_WRITE = 'dragMoveWrite';
var DRAG_SCROLL_READ = 'dragScrollRead';
var DRAG_SCROLL_WRITE = 'dragScrollWrite';
var DRAG_SORT_READ = 'dragSortRead';
var PLACEHOLDER_LAYOUT_READ = 'placeholderLayoutRead';
var PLACEHOLDER_LAYOUT_WRITE = 'placeholderLayoutWrite';
var PLACEHOLDER_RESIZE_WRITE = 'placeholderResizeWrite';
var AUTO_SCROLL_READ = 'autoScrollRead';
var AUTO_SCROLL_WRITE = 'autoScrollWrite';
var DEBOUNCE_READ = 'debounceRead';
var LANE_READ = 0;
var LANE_READ_TAIL = 1;
var LANE_WRITE = 2;
var ticker = new Ticker(3);
function addLayoutTick(itemId, read, write) {
ticker.add(LANE_READ, LAYOUT_READ + itemId, read);
ticker.add(LANE_WRITE, LAYOUT_WRITE + itemId, write);
}
function cancelLayoutTick(itemId) {
ticker.remove(LANE_READ, LAYOUT_READ + itemId);
ticker.remove(LANE_WRITE, LAYOUT_WRITE + itemId);
}
function addVisibilityTick(itemId, read, write) {
ticker.add(LANE_READ, VISIBILITY_READ + itemId, read);
ticker.add(LANE_WRITE, VISIBILITY_WRITE + itemId, write);
}
function cancelVisibilityTick(itemId) {
ticker.remove(LANE_READ, VISIBILITY_READ + itemId);
ticker.remove(LANE_WRITE, VISIBILITY_WRITE + itemId);
}
function addDragStartTick(itemId, read, write) {
ticker.add(LANE_READ, DRAG_START_READ + itemId, read);
ticker.add(LANE_WRITE, DRAG_START_WRITE + itemId, write);
}
function cancelDragStartTick(itemId) {
ticker.remove(LANE_READ, DRAG_START_READ + itemId);
ticker.remove(LANE_WRITE, DRAG_START_WRITE + itemId);
}
function addDragMoveTick(itemId, read, write) {
ticker.add(LANE_READ, DRAG_MOVE_READ + itemId, read);
ticker.add(LANE_WRITE, DRAG_MOVE_WRITE + itemId, write);
}
function cancelDragMoveTick(itemId) {
ticker.remove(LANE_READ, DRAG_MOVE_READ + itemId);
ticker.remove(LANE_WRITE, DRAG_MOVE_WRITE + itemId);
}
function addDragScrollTick(itemId, read, write) {
ticker.add(LANE_READ, DRAG_SCROLL_READ + itemId, read);
ticker.add(LANE_WRITE, DRAG_SCROLL_WRITE + itemId, write);
}
function cancelDragScrollTick(itemId) {
ticker.remove(LANE_READ, DRAG_SCROLL_READ + itemId);
ticker.remove(LANE_WRITE, DRAG_SCROLL_WRITE + itemId);
}
function addDragSortTick(itemId, read) {
ticker.add(LANE_READ_TAIL, DRAG_SORT_READ + itemId, read);
}
function cancelDragSortTick(itemId) {
ticker.remove(LANE_READ_TAIL, DRAG_SORT_READ + itemId);
}
function addPlaceholderLayoutTick(itemId, read, write) {
ticker.add(LANE_READ, PLACEHOLDER_LAYOUT_READ + itemId, read);
ticker.add(LANE_WRITE, PLACEHOLDER_LAYOUT_WRITE + itemId, write);
}
function cancelPlaceholderLayoutTick(itemId) {
ticker.remove(LANE_READ, PLACEHOLDER_LAYOUT_READ + itemId);
ticker.remove(LANE_WRITE, PLACEHOLDER_LAYOUT_WRITE + itemId);
}
function addPlaceholderResizeTick(itemId, write) {
ticker.add(LANE_WRITE, PLACEHOLDER_RESIZE_WRITE + itemId, write);
}
function cancelPlaceholderResizeTick(itemId) {
ticker.remove(LANE_WRITE, PLACEHOLDER_RESIZE_WRITE + itemId);
}
function addAutoScrollTick(read, write) {
ticker.add(LANE_READ, AUTO_SCROLL_READ, read);
ticker.add(LANE_WRITE, AUTO_SCROLL_WRITE, write);
}
function cancelAutoScrollTick() {
ticker.remove(LANE_READ, AUTO_SCROLL_READ);
ticker.remove(LANE_WRITE, AUTO_SCROLL_WRITE);
}
function addDebounceTick(debounceId, read) {
ticker.add(LANE_READ, DEBOUNCE_READ + debounceId, read);
}
function cancelDebounceTick(debounceId) {
ticker.remove(LANE_READ, DEBOUNCE_READ + debounceId);
}
var AXIS_X = 1;
var AXIS_Y = 2;
var FORWARD = 4;
var BACKWARD = 8;
var LEFT = AXIS_X | BACKWARD;
var RIGHT = AXIS_X | FORWARD;
var UP = AXIS_Y | BACKWARD;
var DOWN = AXIS_Y | FORWARD;
var functionType = 'function';
/**
* Check if a value is a function.
*
* @param {*} val
* @returns {Boolean}
*/
function isFunction(val) {
return typeof val === functionType;
}
var isWeakMapSupported = typeof WeakMap === 'function';
var cache$1 = isWeakMapSupported ? new WeakMap() : null;
var cacheInterval = 3000;
var cacheTimer;
var canClearCache = true;
var clearCache = function () {
if (canClearCache) {
cacheTimer = window.clearInterval(cacheTimer);
cache$1 = isWeakMapSupported ? new WeakMap() : null;
} else {
canClearCache = true;
}
};
/**
* Returns the computed value of an element's style property as a string.
*
* @param {HTMLElement} element
* @param {String} style
* @returns {String}
*/
function getStyle(element, style) {
var styles = cache$1 && cache$1.get(element);
if (!styles) {
styles = window.getComputedStyle(element, null);
if (cache$1) cache$1.set(element, styles);
}
if (cache$1) {
if (!cacheTimer) {
cacheTimer = window.setInterval(clearCache, cacheInterval);
} else {
canClearCache = false;
}
}
return styles.getPropertyValue(style);
}
/**
* Returns the computed value of an element's style property transformed into
* a float value.
*
* @param {HTMLElement} el
* @param {String} style
* @returns {Number}
*/
function getStyleAsFloat(el, style) {
return parseFloat(getStyle(el, style)) || 0;
}
var DOC_ELEM = document.documentElement;
var BODY = document.body;
var THRESHOLD_DATA = { value: 0, offset: 0 };
/**
* @param {HTMLElement|Window} element
* @returns {HTMLElement|Window}
*/
function getScrollElement(element) {
if (element === window || element === DOC_ELEM || element === BODY) {
return window;
} else {
return element;
}
}
/**
* @param {HTMLElement|Window} element
* @returns {Number}
*/
function getScrollLeft(element) {
return element === window ? element.pageXOffset : element.scrollLeft;
}
/**
* @param {HTMLElement|Window} element
* @returns {Number}
*/
function getScrollTop(element) {
return element === window ? element.pageYOffset : element.scrollTop;
}
/**
* @param {HTMLElement|Window} element
* @returns {Number}
*/
function getScrollLeftMax(element) {
if (element === window) {
return DOC_ELEM.scrollWidth - DOC_ELEM.clientWidth;
} else {
return element.scrollWidth - element.clientWidth;
}
}
/**
* @param {HTMLElement|Window} element
* @returns {Number}
*/
function getScrollTopMax(element) {
if (element === window) {
return DOC_ELEM.scrollHeight - DOC_ELEM.clientHeight;
} else {
return element.scrollHeight - element.clientHeight;
}
}
/**
* Get window's or element's client rectangle data relative to the element's
* content dimensions (includes inner size + padding, excludes scrollbars,
* borders and margins).
*
* @param {HTMLElement|Window} element
* @returns {Rectangle}
*/
function getContentRect(element, result) {
result = result || {};
if (element === window) {
result.width = DOC_ELEM.clientWidth;
result.height = DOC_ELEM.clientHeight;
result.left = 0;
result.right = result.width;
result.top = 0;
result.bottom = result.height;
} else {
var bcr = element.getBoundingClientRect();
var borderLeft = element.clientLeft || getStyleAsFloat(element, 'border-left-width');
var borderTop = element.clientTop || getStyleAsFloat(element, 'border-top-width');
result.width = element.clientWidth;
result.height = element.clientHeight;
result.left = bcr.left + borderLeft;
result.right = result.left + result.width;
result.top = bcr.top + borderTop;
result.bottom = result.top + result.height;
}
return result;
}
/**
* @param {Item} item
* @returns {Object}
*/
function getItemAutoScrollSettings(item) {
return item._drag._getGrid()._settings.dragAutoScroll;
}
/**
* @param {Item} item
*/
function prepareItemScrollSync(item) {
if (!item._drag) return;
item._drag._prepareScroll();
}
/**
* @param {Item} item
*/
function applyItemScrollSync(item) {
if (!item._drag || !item._isActive) return;
var drag = item._drag;
drag._scrollDiffX = drag._scrollDiffY = 0;
item._setTranslate(drag._left, drag._top);
}
/**
* Compute threshold value and edge offset.
*
* @param {Number} threshold
* @param {Number} safeZone
* @param {Number} itemSize
* @param {Number} targetSize
* @returns {Object}
*/
function computeThreshold(threshold, safeZone, itemSize, targetSize) {
THRESHOLD_DATA.value = Math.min(targetSize / 2, threshold);
THRESHOLD_DATA.offset =
Math.max(0, itemSize + THRESHOLD_DATA.value * 2 + targetSize * safeZone - targetSize) / 2;
return THRESHOLD_DATA;
}
function ScrollRequest() {
this.reset();
}
ScrollRequest.prototype.reset = function () {
if (this.isActive) this.onStop();
this.item = null;
this.element = null;
this.isActive = false;
this.isEnding = false;
this.direction = null;
this.value = null;
this.maxValue = 0;
this.threshold = 0;
this.distance = 0;
this.speed = 0;
this.duration = 0;
this.action = null;
};
ScrollRequest.prototype.hasReachedEnd = function () {
return FORWARD & this.direction ? this.value >= this.maxValue : this.value <= 0;
};
ScrollRequest.prototype.computeCurrentScrollValue = function () {
if (this.value === null) {
return AXIS_X & this.direction ? getScrollLeft(this.element) : getScrollTop(this.element);
}
return Math.max(0, Math.min(this.value, this.maxValue));
};
ScrollRequest.prototype.computeNextScrollValue = function (deltaTime) {
var delta = this.speed * (deltaTime / 1000);
var nextValue = FORWARD & this.direction ? this.value + delta : this.value - delta;
return Math.max(0, Math.min(nextValue, this.maxValue));
};
ScrollRequest.prototype.computeSpeed = (function () {
var data = {
direction: null,
threshold: 0,
distance: 0,
value: 0,
maxValue: 0,
deltaTime: 0,
duration: 0,
isEnding: false,
};
return function (deltaTime) {
var item = this.item;
var speed = getItemAutoScrollSettings(item).speed;
if (isFunction(speed)) {
data.direction = this.direction;
data.threshold = this.threshold;
data.distance = this.distance;
data.value = this.value;
data.maxValue = this.maxValue;
data.duration = this.duration;
data.speed = this.speed;
data.deltaTime = deltaTime;
data.isEnding = this.isEnding;
return speed(item, this.element, data);
} else {
return speed;
}
};
})();
ScrollRequest.prototype.tick = function (deltaTime) {
if (!this.isActive) {
this.isActive = true;
this.onStart();
}
this.value = this.computeCurrentScrollValue();
this.speed = this.computeSpeed(deltaTime);
this.value = this.computeNextScrollValue(deltaTime);
this.duration += deltaTime;
return this.value;
};
ScrollRequest.prototype.onStart = function () {
var item = this.item;
var onStart = getItemAutoScrollSettings(item).onStart;
if (isFunction(onStart)) onStart(item, this.element, this.direction);
};
ScrollRequest.prototype.onStop = function () {
var item = this.item;
var onStop = getItemAutoScrollSettings(item).onStop;
if (isFunction(onStop)) onStop(item, this.element, this.direction);
// Manually nudge sort to happen. There's a good chance that the item is still
// after the scroll stops which means that the next sort will be triggered
// only after the item is moved or it's parent scrolled.
if (item._drag) item._drag.sort();
};
function ScrollAction() {
this.element = null;
this.requestX = null;
this.requestY = null;
this.scrollLeft = 0;
this.scrollTop = 0;
}
ScrollAction.prototype.reset = function () {
if (this.requestX) this.requestX.action = null;
if (this.requestY) this.requestY.action = null;
this.element = null;
this.requestX = null;
this.requestY = null;
this.scrollLeft = 0;
this.scrollTop = 0;
};
ScrollAction.prototype.addRequest = function (request) {
if (AXIS_X & request.direction) {
this.removeRequest(this.requestX);
this.requestX = request;
} else {
this.removeRequest(this.requestY);
this.requestY = request;
}
request.action = this;
};
ScrollAction.prototype.removeRequest = function (request) {
if (!request) return;
if (this.requestX === request) {
this.requestX = null;
request.action = null;
} else if (this.requestY === request) {
this.requestY = null;
request.action = null;
}
};
ScrollAction.prototype.computeScrollValues = function () {
this.scrollLeft = this.requestX ? this.requestX.value : getScrollLeft(this.element);
this.scrollTop = this.requestY ? this.requestY.value : getScrollTop(this.element);
};
ScrollAction.prototype.scroll = function () {
var element = this.element;
if (!element) return;
if (element.scrollTo) {
element.scrollTo(this.scrollLeft, this.scrollTop);
} else {
element.scrollLeft = this.scrollLeft;
element.scrollTop = this.scrollTop;
}
};
function Pool(createItem, releaseItem) {
this.pool = [];
this.createItem = createItem;
this.releaseItem = releaseItem;
}
Pool.prototype.pick = function () {
return this.pool.pop() || this.createItem();
};
Pool.prototype.release = function (item) {
this.releaseItem(item);
if (this.pool.indexOf(item) !== -1) return;
this.pool.push(item);
};
Pool.prototype.reset = function () {
this.pool.length = 0;
};
/**
* Check if two rectangles are overlapping.
*
* @param {Object} a
* @param {Object} b
* @returns {Number}
*/
function isOverlapping(a, b) {
return !(
a.left + a.width <= b.left ||
b.left + b.width <= a.left ||
a.top + a.height <= b.top ||
b.top + b.height <= a.top
);
}
/**
* Calculate intersection area between two rectangle.
*
* @param {Object} a
* @param {Object} b
* @returns {Number}
*/
function getIntersectionArea(a, b) {
if (!isOverlapping(a, b)) return 0;
var width = Math.min(a.left + a.width, b.left + b.width) - Math.max(a.left, b.left);
var height = Math.min(a.top + a.height, b.top + b.height) - Math.max(a.top, b.top);
return width * height;
}
/**
* Calculate how many percent the intersection area of two rectangles is from
* the maximum potential intersection area between the rectangles.
*
* @param {Object} a
* @param {Object} b
* @returns {Number}
*/
function getIntersectionScore(a, b) {
var area = getIntersectionArea(a, b);
if (!area) return 0;
var maxArea = Math.min(a.width, b.width) * Math.min(a.height, b.height);
return (area / maxArea) * 100;
}
var RECT_1 = {
width: 0,
height: 0,
left: 0,
right: 0,
top: 0,
bottom: 0,
};
var RECT_2 = {
width: 0,
height: 0,
left: 0,
right: 0,
top: 0,
bottom: 0,
};
function AutoScroller() {
this._isDestroyed = false;
this._isTicking = false;
this._tickTime = 0;
this._tickDeltaTime = 0;
this._items = [];
this._actions = [];
this._requests = {};
this._requests[AXIS_X] = {};
this._requests[AXIS_Y] = {};
this._requestOverlapCheck = {};
this._dragPositions = {};
this._dragDirections = {};
this._overlapCheckInterval = 150;
this._requestPool = new Pool(
function () {
return new ScrollRequest();
},
function (request) {
request.reset();
}
);
this._actionPool = new Pool(
function () {
return new ScrollAction();
},
function (action) {
action.reset();
}
);
this._readTick = this._readTick.bind(this);
this._writeTick = this._writeTick.bind(this);
}
AutoScroller.AXIS_X = AXIS_X;
AutoScroller.AXIS_Y = AXIS_Y;
AutoScroller.FORWARD = FORWARD;
AutoScroller.BACKWARD = BACKWARD;
AutoScroller.LEFT = LEFT;
AutoScroller.RIGHT = RIGHT;
AutoScroller.UP = UP;
AutoScroller.DOWN = DOWN;
AutoScroller.smoothSpeed = function (maxSpeed, acceleration, deceleration) {
return function (item, element, data) {
var targetSpeed = 0;
if (!data.isEnding) {
if (data.threshold > 0) {
var factor = data.threshold - Math.max(0, data.distance);
targetSpeed = (maxSpeed / data.threshold) * factor;
} else {
targetSpeed = maxSpeed;
}
}
var currentSpeed = data.speed;
var nextSpeed = targetSpeed;
if (currentSpeed === targetSpeed) {
return nextSpeed;
}
if (currentSpeed < targetSpeed) {
nextSpeed = currentSpeed + acceleration * (data.deltaTime / 1000);
return Math.min(targetSpeed, nextSpeed);
} else {
nextSpeed = currentSpeed - deceleration * (data.deltaTime / 1000);
return Math.max(targetSpeed, nextSpeed);
}
};
};
AutoScroller.pointerHandle = function (pointerSize) {
var rect = { left: 0, top: 0, width: 0, height: 0 };
var size = pointerSize || 1;
return function (item, x, y, w, h, pX, pY) {
rect.left = pX - size * 0.5;
rect.top = pY - size * 0.5;
rect.width = size;
rect.height = size;
return rect;
};
};
AutoScroller.prototype._readTick = function (time) {
if (this._isDestroyed) return;
if (time && this._tickTime) {
this._tickDeltaTime = time - this._tickTime;
this._tickTime = time;
this._updateRequests();
this._updateActions();
} else {
this._tickTime = time;
this._tickDeltaTime = 0;
}
};
AutoScroller.prototype._writeTick = function () {
if (this._isDestroyed) return;
this._applyActions();
addAutoScrollTick(this._readTick, this._writeTick);
};
AutoScroller.prototype._startTicking = function () {
this._isTicking = true;
addAutoScrollTick(this._readTick, this._writeTick);
};
AutoScroller.prototype._stopTicking = function () {
this._isTicking = false;
this._tickTime = 0;
this._tickDeltaTime = 0;
cancelAutoScrollTick();
};
AutoScroller.prototype._getItemHandleRect = function (item, handle, rect) {
var itemDrag = item._drag;
if (handle) {
var ev = itemDrag._dragMoveEvent || itemDrag._dragStartEvent;
var data = handle(
item,
itemDrag._clientX,
itemDrag._clientY,
item._width,
item._height,
ev.clientX,
ev.clientY
);
rect.left = data.left;
rect.top = data.top;
rect.width = data.width;
rect.height = data.height;
} else {
rect.left = itemDrag._clientX;
rect.top = itemDrag._clientY;
rect.width = item._width;
rect.height = item._height;
}
rect.right = rect.left + rect.width;
rect.bottom = rect.top + rect.height;
return rect;
};
AutoScroller.prototype._requestItemScroll = function (
item,
axis,
element,
direction,
threshold,
distance,
maxValue
) {
var reqMap = this._requests[axis];
var request = reqMap[item._id];
if (request) {
if (request.element !== element || request.direction !== direction) {
request.reset();
}
} else {
request = this._requestPool.pick();
}
request.item = item;
request.element = element;
request.direction = direction;
request.threshold = threshold;
request.distance = distance;
request.maxValue = maxValue;
reqMap[item._id] = request;
};
AutoScroller.prototype._cancelItemScroll = function (item, axis) {
var reqMap = this._requests[axis];
var request = reqMap[item._id];
if (!request) return;
if (request.action) request.action.removeRequest(request);
this._requestPool.release(request);
delete reqMap[item._id];
};
AutoScroller.prototype._checkItemOverlap = function (item, checkX, checkY) {
var settings = getItemAutoScrollSettings(item);
var targets = isFunction(settings.targets) ? settings.targets(item) : settings.targets;
var threshold = settings.threshold;
var safeZone = settings.safeZone;
if (!targets || !targets.length) {
checkX && this._cancelItemScroll(item, AXIS_X);
checkY && this._cancelItemScroll(item, AXIS_Y);
return;
}
var dragDirections = this._dragDirections[item._id];
var dragDirectionX = dragDirections[0];
var dragDirectionY = dragDirections[1];
if (!dragDirectionX && !dragDirectionY) {
checkX && this._cancelItemScroll(item, AXIS_X);
checkY && this._cancelItemScroll(item, AXIS_Y);
return;
}
var itemRect = this._getItemHandleRect(item, settings.handle, RECT_1);
var testRect = RECT_2;
var target = null;
var testElement = null;
var testAxisX = true;
var testAxisY = true;
var testScore = 0;
var testPriority = 0;
var testThreshold = null;
var testDirection = null;
var testDistance = 0;
var testMaxScrollX = 0;
var testMaxScrollY = 0;
var xElement = null;
var xPriority = -Infinity;
var xThreshold = 0;
var xScore = 0;
var xDirection = null;
var xDistance = 0;
var xMaxScroll = 0;
var yElement = null;
var yPriority = -Infinity;
var yThreshold = 0;
var yScore = 0;
var yDirection = null;
var yDistance = 0;
var yMaxScroll = 0;
for (var i = 0; i < targets.length; i++) {
target = targets[i];
testAxisX = checkX && dragDirectionX && target.axis !== AXIS_Y;
testAxisY = checkY && dragDirectionY && target.axis !== AXIS_X;
testPriority = target.priority || 0;
// Ignore this item if it's x-axis and y-axis priority is lower than
// the currently matching item's.
if ((!testAxisX || testPriority < xPriority) && (!testAxisY || testPriority < yPriority)) {
continue;
}
testElement = getScrollElement(target.element || target);
testMaxScrollX = testAxisX ? getScrollLeftMax(testElement) : -1;
testMaxScrollY = testAxisY ? getScrollTopMax(testElement) : -1;
// Ignore this item if there is no possibility to scroll.
if (!testMaxScrollX && !testMaxScrollY) continue;
testRect = getContentRect(testElement, testRect);
testScore = getIntersectionScore(itemRect, testRect);
// Ignore this item if it's not overlapping at all with the dragged item.
if (testScore <= 0) continue;
// Test x-axis.
if (
testAxisX &&
testPriority >= xPriority &&
testMaxScrollX > 0 &&
(testPriority > xPriority || testScore > xScore)
) {
testDirection = null;
testThreshold = computeThreshold(
typeof target.threshold === 'number' ? target.threshold : threshold,
safeZone,
itemRect.width,
testRect.width
);
if (dragDirectionX === RIGHT) {
testDistance = testRect.right + testThreshold.offset - itemRect.right;
if (testDistance <= testThreshold.value && getScrollLeft(testElement) < testMaxScrollX) {
testDirection = RIGHT;
}
} else if (dragDirectionX === LEFT) {
testDistance = itemRect.left - (testRect.left - testThreshold.offset);
if (testDistance <= testThreshold.value && getScrollLeft(testElement) > 0) {
testDirection = LEFT;
}
}
if (testDirection !== null) {
xElement = testElement;
xPriority = testPriority;
xThreshold = testThreshold.value;
xScore = testScore;
xDirection = testDirection;
xDistance = testDistance;
xMaxScroll = testMaxScrollX;
}
}
// Test y-axis.
if (
testAxisY &&
testPriority >= yPriority &&
testMaxScrollY > 0 &&
(testPriority > yPriority || testScore > yScore)
) {
testDirection = null;
testThreshold = computeThreshold(
typeof target.threshold === 'number' ? target.threshold : threshold,
safeZone,
itemRect.height,
testRect.height
);
if (dragDirectionY === DOWN) {
testDistance = testRect.bottom + testThreshold.offset - itemRect.bottom;
if (testDistance <= testThreshold.value && getScrollTop(testElement) < testMaxScrollY) {
testDirection = DOWN;
}
} else if (dragDirectionY === UP) {
testDistance = itemRect.top - (testRect.top - testThreshold.offset);
if (testDistance <= testThreshold.value && getScrollTop(testElement) > 0) {
testDirection = UP;
}
}
if (testDirection !== null) {
yElement = testElement;
yPriority = testPriority;
yThreshold = testThreshold.value;
yScore = testScore;
yDirection = testDirection;
yDistance = testDistance;
yMaxScroll = testMaxScrollY;
}
}
}
// Request or cancel x-axis scroll.
if (checkX) {
if (xElement) {
this._requestItemScroll(
item,
AXIS_X,
xElement,
xDirection,
xThreshold,
xDistance,
xMaxScroll
);
} else {
this._cancelItemScroll(item, AXIS_X);
}
}
// Request or cancel y-axis scroll.
if (checkY) {
if (yElement) {
this._requestItemScroll(
item,
AXIS_Y,
yElement,
yDirection,
yThreshold,
yDistance,
yMaxScroll
);
} else {
this._cancelItemScroll(item, AXIS_Y);
}
}
};
AutoScroller.prototype._updateScrollRequest = function (scrollRequest) {
var item = scrollRequest.item;
var settings = getItemAutoScrollSettings(item);
var targets = isFunction(settings.targets) ? settings.targets(item) : settings.targets;
var targetCount = (targets && targets.length) || 0;
var threshold = settings.threshold;
var safeZone = settings.safeZone;
var itemRect = this._getItemHandleRect(item, settings.handle, RECT_1);
var testRect = RECT_2;
var target = null;
var testElement = null;
var testIsAxisX = false;
var testScore = null;
var testThreshold = null;
var testDistance = null;
var testScroll = null;
var testMaxScroll = null;
var hasReachedEnd = null;
for (var i = 0; i < targetCount; i++) {
target = targets[i];
// Make sure we have a matching element.
testElement = getScrollElement(target.element || target);
if (testElement !== scrollRequest.element) continue;
// Make sure we have a matching axis.
testIsAxisX = !!(AXIS_X & scrollRequest.direction);
if (testIsAxisX) {
if (target.axis === AXIS_Y) continue;
} else {
if (target.axis === AXIS_X) continue;
}
// Stop scrolling if there is no room to scroll anymore.
testMaxScroll = testIsAxisX ? getScrollLeftMax(testElement) : getScrollTopMax(testElement);
if (testMaxScroll <= 0) {
break;
}
testRect = getContentRect(testElement, testRect);
testScore = getIntersectionScore(itemRect, testRect);
// Stop scrolling if dragged item is not overlapping with the scroll
// element anymore.
if (testScore <= 0) {
break;
}
// Compute threshold and edge offset.
testThreshold = computeThreshold(
typeof target.threshold === 'number' ? target.threshold : threshold,
safeZone,
testIsAxisX ? itemRect.width : itemRect.height,
testIsAxisX ? testRect.width : testRect.height
);
// Compute distance (based on current direction).
if (scrollRequest.direction === LEFT) {
testDistance = itemRect.left - (testRect.left - testThreshold.offset);
} else if (scrollRequest.direction === RIGHT) {
testDistance = testRect.right + testThreshold.offset - itemRect.right;
} else if (scrollRequest.direction === UP) {
testDistance = itemRect.top - (testRect.top - testThreshold.offset);
} else {
testDistance = testRect.bottom + testThreshold.offset - itemRect.bottom;
}
// Stop scrolling if threshold is not exceeded.
if (testDistance > testThreshold.value) {
break;
}
// Stop scrolling if we have reached the end of the scroll value.
testScroll = testIsAxisX ? getScrollLeft(testElement) : getScrollTop(testElement);
hasReachedEnd =
FORWARD & scrollRequest.direction ? testScroll >= testMaxScroll : testScroll <= 0;
if (hasReachedEnd) {
break;
}
// Scrolling can continue, let's update the values.
scrollRequest.maxValue = testMaxScroll;
scrollRequest.threshold = testThreshold.value;
scrollRequest.distance = testDistance;
scrollRequest.isEnding = false;
return true;
}
// Before we end the request, let's see if we need to stop the scrolling
// smoothly or immediately.
if (settings.smoothStop === true && scrollRequest.speed > 0) {
if (hasReachedEnd === null) hasReachedEnd = scrollRequest.hasReachedEnd();
scrollRequest.isEnding = hasReachedEnd ? false : true;
} else {
scrollRequest.isEnding = false;
}
return scrollRequest.isEnding;
};
AutoScroller.prototype._updateRequests = function () {
var items = this._items;
var requestsX = this._requests[AXIS_X];
var requestsY = this._requests[AXIS_Y];
var item, reqX, reqY, checkTime, needsCheck, checkX, checkY;
for (var i = 0; i < items.length; i++) {
item = items[i];
checkTime = this._requestOverlapCheck[item._id];
needsCheck = checkTime > 0 && this._tickTime - checkTime > this._overlapCheckInterval;
checkX = true;
reqX = requestsX[item._id];
if (reqX && reqX.isActive) {
checkX = !this._updateScrollRequest(reqX);
if (checkX) {
needsCheck = true;
this._cancelItemScroll(item, AXIS_X);
}
}
checkY = true;
reqY = requestsY[item._id];
if (reqY && reqY.isActive) {
checkY = !this._updateScrollRequest(reqY);
if (checkY) {
needsCheck = true;
this._cancelItemScroll(item, AXIS_Y);
}
}
if (needsCheck) {
this._requestOverlapCheck[item._id] = 0;
this._checkItemOverlap(item, checkX, checkY);
}
}
};
AutoScroller.prototype._requestAction = function (request, axis) {
var actions = this._actions;
var isAxisX = axis === AXIS_X;
var action = null;
for (var i = 0; i < actions.length; i++) {
action = actions[i];
// If the action's request does not match the request's -> skip.
if (request.element !== action.element) {
action = null;
continue;
}
// If the request and action share the same element, but the request slot
// for the requested axis is already reserved let's ignore and cancel this
// request.
if (isAxisX ? action.requestX : action.requestY) {
this._cancelItemScroll(request.item, axis);
return;
}
// Seems like we have found our action, let's break the loop.
break;
}
if (!action) action = this._actionPool.pick();
action.element = request.element;
action.addRequest(request);
request.tick(this._tickDeltaTime);
actions.push(action);
};
AutoScroller.prototype._updateActions = function () {
var items = this._items;
var requests = this._requests;
var actions = this._actions;
var itemId;
var reqX;
var reqY;
var i;
// Generate actions.
for (i = 0; i < items.length; i++) {
itemId = items[i]._id;
reqX = requests[AXIS_X][itemId];
reqY = requests[AXIS_Y][itemId];
if (reqX) this._requestAction(reqX, AXIS_X);
if (reqY) this._requestAction(reqY, AXIS_Y);
}
// Compute actions' scroll values.
for (i = 0; i < actions.length; i++) {
actions[i].computeScrollValues();
}
};
AutoScroller.prototype._applyActions = function () {
var actions = this._actions;
var items = this._items;
var i;
// No actions -> no scrolling.
if (!actions.length) return;
// Scroll all the required elements.
for (i = 0; i < actions.length; i++) {
actions[i].scroll();
this._actionPool.release(actions[i]);
}
// Reset actions.
actions.length = 0;
// Sync the item position immediately after all the auto-scrolling business is
// finished. Without this procedure the items will jitter during auto-scroll
// (in some cases at least) since the drag scroll handler is async (bound to
// raf tick). Note that this procedure should not emit any dragScroll events,
// because otherwise they would be emitted twice for the same event.
for (i = 0; i < items.length; i++) prepareItemScrollSync(items[i]);
for (i = 0; i < items.length; i++) applyItemScrollSync(items[i]);
};
AutoScroller.prototype._updateDragDirection = function (item) {
var dragPositions = this._dragPositions[item._id];
var dragDirections = this._dragDirections[item._id];
var x1 = item._drag._left;
var y1 = item._drag._top;
if (dragPositions.length) {
var x2 = dragPositions[0];
var y2 = dragPositions[1];
dragDirections[0] = x1 > x2 ? RIGHT : x1 < x2 ? LEFT : dragDirections[0] || 0;
dragDirections[1] = y1 > y2 ? DOWN : y1 < y2 ? UP : dragDirections[1] || 0;
}
dragPositions[0] = x1;
dragPositions[1] = y1;
};
AutoScroller.prototype.addItem = function (item) {
if (this._isDestroyed) return;
var index = this._items.indexOf(item);
if (index === -1) {
this._items.push(item);
this._requestOverlapCheck[item._id] = this._tickTime;
this._dragDirections[item._id] = [0, 0];
this._dragPositions[item._id] = [];
if (!this._isTicking) this._startTicking();
}
};
AutoScroller.prototype.updateItem = function (item) {
if (this._isDestroyed) return;
this._updateDragDirection(item);
if (!this._requestOverlapCheck[item._id]) {
this._requestOverlapCheck[item._id] = this._tickTime;
}
};
AutoScroller.prototype.removeItem = function (item) {
if (this._isDestroyed) return;
var index = this._items.indexOf(item);
if (index === -1) return;
var itemId = item._id;
var reqX = this._requests[AXIS_X][itemId];
if (reqX) {
this._cancelItemScroll(item, AXIS_X);
delete this._requests[AXIS_X][itemId];
}
var reqY = this._requests[AXIS_Y][itemId];
if (reqY) {
this._cancelItemScroll(item, AXIS_Y);
delete this._requests[AXIS_Y][itemId];
}
delete this._requestOverlapCheck[itemId];
delete this._dragPositions[itemId];
delete this._dragDirections[itemId];
this._items.splice(index, 1);
if (this._isTicking && !this._items.length) {
this._stopTicking();
}
};
AutoScroller.prototype.isItemScrollingX = function (item) {
var reqX = this._requests[AXIS_X][item._id];
return !!(reqX && reqX.isActive);
};
AutoScroller.prototype.isItemScrollingY = function (item) {
var reqY = this._requests[AXIS_Y][item._id];
return !!(reqY && reqY.isActive);
};
AutoScroller.prototype.isItemScrolling = function (item) {
return this.isItemScrollingX(item) || this.isItemScrollingY(item);
};
AutoScroller.prototype.destroy = function () {
if (this._isDestroyed) return;
var items = this._items.slice(0);
for (var i = 0; i < items.length; i++) {
this.removeItem(items[i]);
}
this._actions.length = 0;
this._requestPool.reset();
this._actionPool.reset();
this._isDestroyed = true;
};
var ElProto = window.Element.prototype;
var matchesFn =
ElProto.matches ||
ElProto.matchesSelector ||
ElProto.webkitMatchesSelector ||
ElProto.mozMatchesSelector ||
ElProto.msMatchesSelector ||
ElProto.oMatchesSelector ||
function () {
return false;
};
/**
* Check if element matches a CSS selector.
*
* @param {Element} el
* @param {String} selector
* @returns {Boolean}
*/
function elementMatches(el, selector) {
return matchesFn.call(el, selector);
}
/**
* Add class to an element.
*
* @param {HTMLElement} element
* @param {String} className
*/
function addClass(element, className) {
if (!className) return;
if (element.classList) {
element.classList.add(className);
} else {
if (!elementMatches(element, '.' + className)) {
element.className += ' ' + className;
}
}
}
var tempArray = [];
var numberType = 'number';
/**
* Insert an item or an array of items to array to a specified index. Mutates
* the array. The index can be negative in which case the items will be added
* to the end of the array.
*
* @param {Array} array
* @param {*} items
* @param {Number} [index=-1]
*/
function arrayInsert(array, items, index) {
var startIndex = typeof index === numberType ? index : -1;
if (startIndex < 0) startIndex = array.length - startIndex + 1;
array.splice.apply(array, tempArray.concat(startIndex, 0, items));
tempArray.length = 0;
}
/**
* Normalize array index. Basically this function makes sure that the provided
* array index is within the bounds of the provided array and also transforms
* negative index to the matching positive index. The third (optional) argument
* allows you to define offset for array's length in case you are adding items
* to the array or removing items from the array.
*
* @param {Array} array
* @param {Number} index
* @param {Number} [sizeOffset]
*/
function normalizeArrayIndex(array, index, sizeOffset) {
var maxIndex = Math.max(0, array.length - 1 + (sizeOffset || 0));
return index > maxIndex ? maxIndex : index < 0 ? Math.max(maxIndex + index + 1, 0) : index;
}
/**
* Move array item to another index.
*
* @param {Array} array
* @param {Number} fromIndex
* - Index (positive or negative) of the item that will be moved.
* @param {Number} toIndex
* - Index (positive or negative) where the item should be moved to.
*/
function arrayMove(array, fromIndex, toIndex) {
// Make sure the array has two or more items.
if (array.length < 2) return;
// Normalize the indices.
var from = normalizeArrayIndex(array, fromIndex);
var to = normalizeArrayIndex(array, toIndex);
// Add target item to the new position.
if (from !== to) {
array.splice(to, 0, array.splice(from, 1)[0]);
}
}
/**
* Swap array items.
*
* @param {Array} array
* @param {Number} index
* - Index (positive or negative) of the item that will be swapped.
* @param {Number} withIndex
* - Index (positive or negative) of the other item that will be swapped.
*/
function arraySwap(array, index, withIndex) {
// Make sure the array has two or more items.
if (array.length < 2) return;
// Normalize the indices.
var indexA = normalizeArrayIndex(array, index);
var indexB = normalizeArrayIndex(array, withIndex);
var temp;
// Swap the items.
if (indexA !== indexB) {
temp = array[indexA];
array[indexA] = array[indexB];
array[indexB] = temp;
}
}
var transformProp = getPrefixedPropName(document.documentElement.style, 'transform') || 'transform';
var styleNameRegEx = /([A-Z])/g;
var prefixRegex = /^(webkit-|moz-|ms-|o-)/;
var msPrefixRegex = /^(-m-s-)/;
/**
* Transforms a camel case style property to kebab case style property. Handles
* vendor prefixed properties elegantly as well, e.g. "WebkitTransform" and
* "webkitTransform" are both transformed into "-webkit-transform".
*
* @param {String} property
* @returns {String}
*/
function getStyleName(property) {
// Initial slicing, turns "fooBarProp" into "foo-bar-prop".
var styleName = property.replace(styleNameRegEx, '-$1').toLowerCase();
// Handle properties that start with "webkit", "moz", "ms" or "o" prefix (we
// need to add an extra '-' to the beginnig).
styleName = styleName.replace(prefixRegex, '-$1');
// Handle properties that start with "MS" prefix (we need to transform the
// "-m-s-" into "-ms-").
styleName = styleName.replace(msPrefixRegex, '-ms-');
return styleName;
}
var transformStyle = getStyleName(transformProp);
var transformNone = 'none';
var displayInline = 'inline';
var displayNone = 'none';
var displayStyle = 'display';
/**
* Returns true if element is transformed, false if not. In practice the
* element's display value must be anything else than "none" or "inline" as
* well as have a valid transform value applied in order to be counted as a
* transformed element.
*
* Borrowed from Mezr (v0.6.1):
* https://github.com/niklasramo/mezr/blob/0.6.1/mezr.js#L661
*
* @param {HTMLElement} element
* @returns {Boolean}
*/
function isTransformed(element) {
var transform = getStyle(element, transformStyle);
if (!transform || transform === transformNone) return false;
var display = getStyle(element, displayStyle);
if (display === displayInline || display === displayNone) return false;
return true;
}
/**
* Returns an absolute positioned element's containing block, which is
* considered to be the closest ancestor element that the target element's
* positioning is relative to. Disclaimer: this only works as intended for
* absolute positioned elements.
*
* @param {HTMLElement} element
* @returns {(Document|Element)}
*/
function getContainingBlock(element) {
// As long as the containing block is an element, static and not
// transformed, try to get the element's parent element and fallback to
// document. https://github.com/niklasramo/mezr/blob/0.6.1/mezr.js#L339
var doc = document;
var res = element || doc;
while (res && res !== doc && getStyle(res, 'position') === 'static' && !isTransformed(res)) {
res = res.parentElement || doc;
}
return res;
}
var offsetA = {};
var offsetB = {};
var offsetDiff = {};
/**
* Returns the element's document offset, which in practice means the vertical
* and horizontal distance between the element's northwest corner and the
* document's northwest corner. Note that this function always returns the same
* object so be sure to read the data from it instead using it as a reference.
*
* @param {(Document|Element|Window)} element
* @param {Object} [offsetData]
* - Optional data object where the offset data will be inserted to. If not
* provided a new object will be created for the return data.
* @returns {Object}
*/
function getOffset(element, offsetData) {
var offset = offsetData || {};
var rect;
// Set up return data.
offset.left = 0;
offset.top = 0;
// Document's offsets are always 0.
if (element === document) return offset;
// Add viewport scroll left/top to the respective offsets.
offset.left = window.pageXOffset || 0;
offset.top = window.pageYOffset || 0;
// Window's offsets are the viewport scroll left/top values.
if (element.self === window.self) return offset;
// Add element's client rects to the offsets.
rect = element.getBoundingClientRect();
offset.left += rect.left;
offset.top += rect.top;
// Exclude element's borders from the offset.
offset.left += getStyleAsFloat(element, 'border-left-width');
offset.top += getStyleAsFloat(element, 'border-top-width');
return offset;
}
/**
* Calculate the offset difference two elements.
*
* @param {HTMLElement} elemA
* @param {HTMLElement} elemB
* @param {Boolean} [compareContainingBlocks=false]
* - When this is set to true the containing blocks of the provided elements
* will be used for calculating the difference. Otherwise the provided
* elements will be compared directly.
* @returns {Object}
*/
function getOffsetDiff(elemA, elemB, compareContainingBlocks) {
offsetDiff.left = 0;
offsetDiff.top = 0;
// If elements are same let's return early.
if (elemA === elemB) return offsetDiff;
// Compare containing blocks if necessary.
if (compareContainingBlocks) {
elemA = getContainingBlock(elemA);
elemB = getContainingBlock(elemB);
// If containing blocks are identical, let's return early.
if (elemA === elemB) return offsetDiff;
}
// Finally, let's calculate the offset diff.
getOffset(elemA, offsetA);
getOffset(elemB, offsetB);
offsetDiff.left = offsetB.left - offsetA.left;
offsetDiff.top = offsetB.top - offsetA.top;
return offsetDiff;
}
/**
* Check if overflow style value is scrollable.
*
* @param {String} value
* @returns {Boolean}
*/
function isScrollableOverflow(value) {
return value === 'auto' || value === 'scroll' || value === 'overlay';
}
/**
* Check if an element is scrollable.
*
* @param {HTMLElement} element
* @returns {Boolean}
*/
function isScrollable(element) {
return (
isScrollableOverflow(getStyle(element, 'overflow')) ||
isScrollableOverflow(getStyle(element, 'overflow-x')) ||
isScrollableOverflow(getStyle(element, 'overflow-y'))
);
}
/**
* Collect element's ancestors that are potentially scrollable elements. The
* provided element is also also included in the check, meaning that if it is
* scrollable it is added to the result array.
*
* @param {HTMLElement} element
* @param {Array} [result]
* @returns {Array}
*/
function getScrollableAncestors(element, result) {
result = result || [];
// Find scroll parents.
while (element && element !== document) {
// If element is inside ShadowDOM let's get it's host node from the real
// DOM and continue looping.
if (element.getRootNode && element instanceof DocumentFragment) {
element = element.getRootNode().host;
continue;
}
// If element is scrollable let's add it to the scrollable list.
if (isScrollable(element)) {
result.push(element);
}
element = element.parentNode;
}
// Always add window to the results.
result.push(window);
return result;
}
var translateValue = {};
var transformNone$1 = 'none';
var rxMat3d = /^matrix3d/;
var rxMatTx = /([^,]*,){4}/;
var rxMat3dTx = /([^,]*,){12}/;
var rxNextItem = /[^,]*,/;
/**
* Returns the element's computed translateX and translateY values as a floats.
* The returned object is always the same object and updated every time this
* function is called.
*
* @param {HTMLElement} element
* @returns {Object}
*/
function getTranslate(element) {
translateValue.x = 0;
translateValue.y = 0;
var transform = getStyle(element, transformStyle);
if (!transform || transform === transformNone$1) {
return translateValue;
}
// Transform style can be in either matrix3d(...) or matrix(...).
var isMat3d = rxMat3d.test(transform);
var tX = transform.replace(isMat3d ? rxMat3dTx : rxMatTx, '');
var tY = tX.replace(rxNextItem, '');
translateValue.x = parseFloat(tX) || 0;
translateValue.y = parseFloat(tY) || 0;
return translateValue;
}
/**
* Remove class from an element.
*
* @param {HTMLElement} element
* @param {String} className
*/
function removeClass(element, className) {
if (!className) return;
if (element.classList) {
element.classList.remove(className);
} else {
if (elementMatches(element, '.' + className)) {
element.className = (' ' + element.className + ' ')
.replace(' ' + className + ' ', ' ')
.trim();
}
}
}
var START_PREDICATE_INACTIVE = 0;
var START_PREDICATE_PENDING = 1;
var START_PREDICATE_RESOLVED = 2;
var SCROLL_LISTENER_OPTIONS = hasPassiveEvents() ? { passive: true } : false;
/**
* Bind touch interaction to an item.
*
* @class
* @param {Item} item
*/
function ItemDrag(item) {
var element = item._element;
var grid = item.getGrid();
var settings = grid._settings;
this._item = item;
this._gridId = grid._id;
this._isDestroyed = false;
this._isMigrating = false;
// Start predicate data.
this._startPredicate = isFunction(settings.dragStartPredicate)
? settings.dragStartPredicate
: ItemDrag.defaultStartPredicate;
this._startPredicateState = START_PREDICATE_INACTIVE;
this._startPredicateResult = undefined;
// Data for drag sort predicate heuristics.
this._isSortNeeded = false;
this._sortTimer = undefined;
this._blockedSortIndex = null;
this._sortX1 = 0;
this._sortX2 = 0;
this._sortY1 = 0;
this._sortY2 = 0;
// Setup item's initial drag data.
this._reset();
// Bind the methods that needs binding.
this._preStartCheck = this._preStartCheck.bind(this);
this._preEndCheck = this._preEndCheck.bind(this);
this._onScroll = this._onScroll.bind(this);
this._prepareStart = this._prepareStart.bind(this);
this._applyStart = this._applyStart.bind(this);
this._prepareMove = this._prepareMove.bind(this);
this._applyMove = this._applyMove.bind(this);
this._prepareScroll = this._prepareScroll.bind(this);
this._applyScroll = this._applyScroll.bind(this);
this._handleSort = this._handleSort.bind(this);
this._handleSortDelayed = this._handleSortDelayed.bind(this);
// Get drag handle element.
this._handle = (settings.dragHandle && element.querySelector(settings.dragHandle)) || element;
// Init dragger.
this._dragger = new Dragger(this._handle, settings.dragCssProps);
this._dragger.on('start', this._preStartCheck);
this._dragger.on('move', this._preStartCheck);
this._dragger.on('cancel', this._preEndCheck);
this._dragger.on('end', this._preEndCheck);
}
/**
* Public properties
* *****************
*/
/**
* @public
* @static
* @type {AutoScroller}
*/
ItemDrag.autoScroller = new AutoScroller();
/**
* Public static methods
* *********************
*/
/**
* Default drag start predicate handler that handles anchor elements
* gracefully. The return value of this function defines if the drag is
* started, rejected or pending. When true is returned the dragging is started
* and when false is returned the dragging is rejected. If nothing is returned
* the predicate will be called again on the next drag movement.
*
* @public
* @static
* @param {Item} item
* @param {Object} event
* @param {Object} [options]
* - An optional options object which can be used to pass the predicate
* it's options manually. By default the predicate retrieves the options
* from the grid's settings.
* @returns {(Boolean|undefined)}
*/
ItemDrag.defaultStartPredicate = function (item, event, options) {
var drag = item._drag;
// Make sure left button is pressed on mouse.
if (event.isFirst && event.srcEvent.button) {
return false;
}
// If the start event is trusted, non-cancelable and it's default action has
// not been prevented it is in most cases a sign that the gesture would be
// cancelled anyways right after it has started (e.g. starting drag while
// the page is scrolling).
if (
event.isFirst &&
event.srcEvent.isTrusted === true &&
event.srcEvent.defaultPrevented === false &&
event.srcEvent.cancelable === false
) {
return false;
}
// Final event logic. At this stage return value does not matter anymore,
// the predicate is either resolved or it's not and there's nothing to do
// about it. Here we just reset data and if the item element is a link
// we follow it (if there has only been slight movement).
if (event.isFinal) {
drag._finishStartPredicate(event);
return;
}
// Setup predicate data from options if not already set.
var predicate = drag._startPredicateData;
if (!predicate) {
var config = options || drag._getGrid()._settings.dragStartPredicate || {};
drag._startPredicateData = predicate = {
distance: Math.max(config.distance, 0) || 0,
delay: Math.max(config.delay, 0) || 0,
};
}
// If delay is defined let's keep track of the latest event and initiate
// delay if it has not been done yet.
if (predicate.delay) {
predicate.event = event;
if (!predicate.delayTimer) {
predicate.delayTimer = window.setTimeout(function () {
predicate.delay = 0;
if (drag._resolveStartPredicate(predicate.event)) {
drag._forceResolveStartPredicate(predicate.event);
drag._resetStartPredicate();
}
}, predicate.delay);
}
}
return drag._resolveStartPredicate(event);
};
/**
* Default drag sort predicate.
*
* @public
* @static
* @param {Item} item
* @param {Object} [options]
* @param {Number} [options.threshold=50]
* @param {String} [options.action='move']
* @returns {?Object}
* - Returns `null` if no valid index was found. Otherwise returns drag sort
* command.
*/
ItemDrag.defaultSortPredicate = (function () {
var itemRect = {};
var targetRect = {};
var returnData = {};
var gridsArray = [];
var minThreshold = 1;
var maxThreshold = 100;
function getTargetGrid(item, rootGrid, threshold) {
var target = null;
var dragSort = rootGrid._settings.dragSort;
var bestScore = -1;
var gridScore;
var grids;
var grid;
var container;
var containerRect;
var left;
var top;
var right;
var bottom;
var i;
// Get potential target grids.
if (dragSort === true) {
gridsArray[0] = rootGrid;
grids = gridsArray;
} else if (isFunction(dragSort)) {
grids = dragSort.call(rootGrid, item);
}
// Return immediately if there are no grids.
if (!grids || !Array.isArray(grids) || !grids.length) {
return target;
}
// Loop through the grids and get the best match.
for (i = 0; i < grids.length; i++) {
grid = grids[i];
// Filter out all destroyed grids.
if (grid._isDestroyed) continue;
// Compute the grid's client rect an clamp the initial boundaries to
// viewport dimensions.
grid._updateBoundingRect();
left = Math.max(0, grid._left);
top = Math.max(0, grid._top);
right = Math.min(window.innerWidth, grid._right);
bottom = Math.min(window.innerHeight, grid._bottom);
// The grid might be inside one or more elements that clip it's visibility
// (e.g overflow scroll/hidden) so we want to find out the visible portion
// of the grid in the viewport and use that in our calculations.
container = grid._element.parentNode;
while (
container &&
container !== document &&
container !== document.documentElement &&
container !== document.body
) {
if (container.getRootNode && container instanceof DocumentFragment) {
container = container.getRootNode().host;
continue;
}
if (getStyle(container, 'overflow') !== 'visible') {
containerRect = container.getBoundingClientRect();
left = Math.max(left, containerRect.left);
top = Math.max(top, containerRect.top);
right = Math.min(right, containerRect.right);
bottom = Math.min(bottom, containerRect.bottom);
}
if (getStyle(container, 'position') === 'fixed') {
break;
}
container = container.parentNode;
}
// No need to go further if target rect does not have visible area.
if (left >= right || top >= bottom) continue;
// Check how much dragged element overlaps the container element.
targetRect.left = left;
targetRect.top = top;
targetRect.width = right - left;
targetRect.height = bottom - top;
gridScore = getIntersectionScore(itemRect, targetRect);
// Check if this grid is the best match so far.
if (gridScore > threshold && gridScore > bestScore) {
bestScore = gridScore;
target = grid;
}
}
// Always reset grids array.
gridsArray.length = 0;
return target;
}
return function (item, options) {
var drag = item._drag;
var rootGrid = drag._getGrid();
// Get drag sort predicate settings.
var sortThreshold = options && typeof options.threshold === 'number' ? options.threshold : 50;
var sortAction = options && options.action === ACTION_SWAP ? ACTION_SWAP : ACTION_MOVE;
var migrateAction =
options && options.migrateAction === ACTION_SWAP ? ACTION_SWAP : ACTION_MOVE;
// Sort threshold must be a positive number capped to a max value of 100. If
// that's not the case this function will not work correctly. So let's clamp
// the threshold just in case.
sortThreshold = Math.min(Math.max(sortThreshold, minThreshold), maxThreshold);
// Populate item rect data.
itemRect.width = item._width;
itemRect.height = item._height;
itemRect.left = drag._clientX;
itemRect.top = drag._clientY;
// Calculate the target grid.
var grid = getTargetGrid(item, rootGrid, sortThreshold);
// Return early if we found no grid container element that overlaps the
// dragged item enough.
if (!grid) return null;
var isMigration = item.getGrid() !== grid;
var gridOffsetLeft = 0;
var gridOffsetTop = 0;
var matchScore = 0;
var matchIndex = -1;
var hasValidTargets = false;
var target;
var score;
var i;
// If item is moved within it's originating grid adjust item's left and
// top props. Otherwise if item is moved to/within another grid get the
// container element's offset (from the element's content edge).
if (grid === rootGrid) {
itemRect.left = drag._gridX + item._marginLeft;
itemRect.top = drag._gridY + item._marginTop;
} else {
grid._updateBorders(1, 0, 1, 0);
gridOffsetLeft = grid._left + grid._borderLeft;
gridOffsetTop = grid._top + grid._borderTop;
}
// Loop through the target grid items and try to find the best match.
for (i = 0; i < grid._items.length; i++) {
target = grid._items[i];
// If the target item is not active or the target item is the dragged
// item let's skip to the next item.
if (!target._isActive || target === item) {
continue;
}
// Mark the grid as having valid target items.
hasValidTargets = true;
// Calculate the target's overlap score with the dragged item.
targetRect.width = target._width;
targetRect.height = target._height;
targetRect.left = target._left + target._marginLeft + gridOffsetLeft;
targetRect.top = target._top + target._marginTop + gridOffsetTop;
score = getIntersectionScore(itemRect, targetRect);
// Update best match index and score if the target's overlap score with
// the dragged item is higher than the current best match score.
if (score > matchScore) {
matchIndex = i;
matchScore = score;
}
}
// If there is no valid match and the dragged item is being moved into
// another grid we need to do some guess work here. If there simply are no
// valid targets (which means that the dragged item will be the only active
// item in the new grid) we can just add it as the first item. If we have
// valid items in the new grid and the dragged item is overlapping one or
// more of the items in the new grid let's make an exception with the
// threshold and just pick the item which the dragged item is overlapping
// most. However, if the dragged item is not overlapping any of the valid
// items in the new grid let's position it as the last item in the grid.
if (isMigration && matchScore < sortThreshold) {
matchIndex = hasValidTargets ? matchIndex : 0;
matchScore = sortThreshold;
}
// Check if the best match overlaps enough to justify a placement switch.
if (matchScore >= sortThreshold) {
returnData.grid = grid;
returnData.index = matchIndex;
returnData.action = isMigration ? migrateAction : sortAction;
return returnData;
}
return null;
};
})();
/**
* Public prototype methods
* ************************
*/
/**
* Abort dragging and reset drag data.
*
* @public
*/
ItemDrag.prototype.stop = function () {
if (!this._isActive) return;
// If the item is being dropped into another grid, finish it up and return
// immediately.
if (this._isMigrating) {
this._finishMigration();
return;
}
// Cancel queued ticks.
var itemId = this._item._id;
cancelDragStartTick(itemId);
cancelDragMoveTick(itemId);
cancelDragScrollTick(itemId);
// Cancel sort procedure.
this._cancelSort();
if (this._isStarted) {
// Remove scroll listeners.
this._unbindScrollListeners();
var element = item._element;
var grid = this._getGrid();
var draggingClass = grid._settings.itemDraggingClass;
// Append item element to the container if it's not it's child. Also make
// sure the translate values are adjusted to account for the DOM shift.
if (element.parentNode !== grid._element) {
grid._element.appendChild(element);
item._setTranslate(this._gridX, this._gridY);
// We need to do forced reflow to make sure the dragging class is removed
// gracefully.
// eslint-disable-next-line
if (draggingClass) element.clientWidth;
}
// Remove dragging class.
removeClass(element, draggingClass);
}
// Reset drag data.
this._reset();
};
/**
* Manually trigger drag sort. This is only needed for special edge cases where
* e.g. you have disabled sort and want to trigger a sort right after enabling
* it (and don't want to wait for the next move/scroll event).
*
* @private
* @param {Boolean} [force=false]
*/
ItemDrag.prototype.sort = function (force) {
var item = this._item;
if (item._isActive && this._dragMoveEvent) {
if (force === true) {
this._handleSort();
} else {
addDragSortTick(item._id, this._handleSort);
}
}
};
/**
* Destroy instance.
*
* @public
*/
ItemDrag.prototype.destroy = function () {
if (this._isDestroyed) return;
this.stop();
this._dragger.destroy();
ItemDrag.autoScroller.removeItem(this._item);
this._isDestroyed = true;
};
/**
* Private prototype methods
* *************************
*/
/**
* Get Grid instance.
*
* @private
* @returns {?Grid}
*/
ItemDrag.prototype._getGrid = function () {
return GRID_INSTANCES[this._gridId] || null;
};
/**
* Setup/reset drag data.
*
* @private
*/
ItemDrag.prototype._reset = function () {
this._isActive = false;
this._isStarted = false;
// The dragged item's container element.
this._container = null;
// The dragged item's containing block.
this._containingBlock = null;
// Drag/scroll event data.
this._dragStartEvent = null;
this._dragMoveEvent = null;
this._dragPrevMoveEvent = null;
this._scrollEvent = null;
// All the elements which need to be listened for scroll events during
// dragging.
this._scrollers = [];
// The current translateX/translateY position.
this._left = 0;
this._top = 0;
// Dragged element's current position within the grid.
this._gridX = 0;
this._gridY = 0;
// Dragged element's current offset from window's northwest corner. Does
// not account for element's margins.
this._clientX = 0;
this._clientY = 0;
// Keep track of the clientX/Y diff for scrolling.
this._scrollDiffX = 0;
this._scrollDiffY = 0;
// Keep track of the clientX/Y diff for moving.
this._moveDiffX = 0;
this._moveDiffY = 0;
// Offset difference between the dragged element's temporary drag
// container and it's original container.
this._containerDiffX = 0;
this._containerDiffY = 0;
};
/**
* Bind drag scroll handlers to all scrollable ancestor elements of the
* dragged element and the drag container element.
*
* @private
*/
ItemDrag.prototype._bindScrollListeners = function () {
var gridContainer = this._getGrid()._element;
var dragContainer = this._container;
var scrollers = this._scrollers;
var gridScrollers;
var i;
// Get dragged element's scrolling parents.
scrollers.length = 0;
getScrollableAncestors(this._item._element.parentNode, scrollers);
// If drag container is defined and it's not the same element as grid
// container then we need to add the grid container and it's scroll parents
// to the elements which are going to be listener for scroll events.
if (dragContainer !== gridContainer) {
gridScrollers = [];
getScrollableAncestors(gridContainer, gridScrollers);
for (i = 0; i < gridScrollers.length; i++) {
if (scrollers.indexOf(gridScrollers[i]) < 0) {
scrollers.push(gridScrollers[i]);
}
}
}
// Bind scroll listeners.
for (i = 0; i < scrollers.length; i++) {
scrollers[i].addEventListener('scroll', this._onScroll, SCROLL_LISTENER_OPTIONS);
}
};
/**
* Unbind currently bound drag scroll handlers from all scrollable ancestor
* elements of the dragged element and the drag container element.
*
* @private
*/
ItemDrag.prototype._unbindScrollListeners = function () {
var scrollers = this._scrollers;
var i;
for (i = 0; i < scrollers.length; i++) {
scrollers[i].removeEventListener('scroll', this._onScroll, SCROLL_LISTENER_OPTIONS);
}
scrollers.length = 0;
};
/**
* Unbind currently bound drag scroll handlers from all scrollable ancestor
* elements of the dragged element and the drag container element.
*
* @private
* @param {Object} event
* @returns {Boolean}
*/
ItemDrag.prototype._resolveStartPredicate = function (event) {
var predicate = this._startPredicateData;
if (event.distance < predicate.distance || predicate.delay) return;
this._resetStartPredicate();
return true;
};
/**
* Forcefully resolve drag start predicate.
*
* @private
* @param {Object} event
*/
ItemDrag.prototype._forceResolveStartPredicate = function (event) {
if (!this._isDestroyed && this._startPredicateState === START_PREDICATE_PENDING) {
this._startPredicateState = START_PREDICATE_RESOLVED;
this._onStart(event);
}
};
/**
* Finalize start predicate.
*
* @private
* @param {Object} event
*/
ItemDrag.prototype._finishStartPredicate = function (event) {
var element = this._item._element;
// Check if this is a click (very subjective heuristics).
var isClick = Math.abs(event.deltaX) < 2 && Math.abs(event.deltaY) < 2 && event.deltaTime < 200;
// Reset predicate.
this._resetStartPredicate();
// If the gesture can be interpreted as click let's try to open the element's
// href url (if it is an anchor element).
if (isClick) openAnchorHref(element);
};
/**
* Reset drag sort heuristics.
*
* @private
* @param {Number} x
* @param {Number} y
*/
ItemDrag.prototype._resetHeuristics = function (x, y) {
this._blockedSortIndex = null;
this._sortX1 = this._sortX2 = x;
this._sortY1 = this._sortY2 = y;
};
/**
* Run heuristics and return true if overlap check can be performed, and false
* if it can not.
*
* @private
* @param {Number} x
* @param {Number} y
* @returns {Boolean}
*/
ItemDrag.prototype._checkHeuristics = function (x, y) {
var settings = this._getGrid()._settings.dragSortHeuristics;
var minDist = settings.minDragDistance;
// Skip heuristics if not needed.
if (minDist <= 0) {
this._blockedSortIndex = null;
return true;
}
var diffX = x - this._sortX2;
var diffY = y - this._sortY2;
// If we can't do proper bounce back check make sure that the blocked index
// is not set.
var canCheckBounceBack = minDist > 3 && settings.minBounceBackAngle > 0;
if (!canCheckBounceBack) {
this._blockedSortIndex = null;
}
if (Math.abs(diffX) > minDist || Math.abs(diffY) > minDist) {
// Reset blocked index if angle changed enough. This check requires a
// minimum value of 3 for minDragDistance to function properly.
if (canCheckBounceBack) {
var angle = Math.atan2(diffX, diffY);
var prevAngle = Math.atan2(this._sortX2 - this._sortX1, this._sortY2 - this._sortY1);
var deltaAngle = Math.atan2(Math.sin(angle - prevAngle), Math.cos(angle - prevAngle));
if (Math.abs(deltaAngle) > settings.minBounceBackAngle) {
this._blockedSortIndex = null;
}
}
// Update points.
this._sortX1 = this._sortX2;
this._sortY1 = this._sortY2;
this._sortX2 = x;
this._sortY2 = y;
return true;
}
return false;
};
/**
* Reset for default drag start predicate function.
*
* @private
*/
ItemDrag.prototype._resetStartPredicate = function () {
var predicate = this._startPredicateData;
if (predicate) {
if (predicate.delayTimer) {
predicate.delayTimer = window.clearTimeout(predicate.delayTimer);
}
this._startPredicateData = null;
}
};
/**
* Handle the sorting procedure. Manage drag sort heuristics/interval and
* check overlap when necessary.
*
* @private
*/
ItemDrag.prototype._handleSort = function () {
var settings = this._getGrid()._settings;
// No sorting when drag sort is disabled. Also, account for the scenario where
// dragSort is temporarily disabled during drag procedure so we need to reset
// sort timer heuristics state too.
if (
!settings.dragSort ||
(!settings.dragAutoScroll.sortDuringScroll && ItemDrag.autoScroller.isItemScrolling(this._item))
) {
this._sortX1 = this._sortX2 = this._gridX;
this._sortY1 = this._sortY2 = this._gridY;
// We set this to true intentionally so that overlap check would be
// triggered as soon as possible after sort becomes enabled again.
this._isSortNeeded = true;
if (this._sortTimer !== undefined) {
this._sortTimer = window.clearTimeout(this._sortTimer);
}
return;
}
// If sorting is enabled we always need to run the heuristics check to keep
// the tracked coordinates updated. We also allow an exception when the sort
// timer is finished because the heuristics are intended to prevent overlap
// checks based on the dragged element's immediate movement and a delayed
// overlap check is valid if it comes through, because it was valid when it
// was invoked.
var shouldSort = this._checkHeuristics(this._gridX, this._gridY);
if (!this._isSortNeeded && !shouldSort) return;
var sortInterval = settings.dragSortHeuristics.sortInterval;
if (sortInterval <= 0 || this._isSortNeeded) {
this._isSortNeeded = false;
if (this._sortTimer !== undefined) {
this._sortTimer = window.clearTimeout(this._sortTimer);
}
this._checkOverlap();
} else if (this._sortTimer === undefined) {
this._sortTimer = window.setTimeout(this._handleSortDelayed, sortInterval);
}
};
/**
* Delayed sort handler.
*
* @private
*/
ItemDrag.prototype._handleSortDelayed = function () {
this._isSortNeeded = true;
this._sortTimer = undefined;
addDragSortTick(this._item._id, this._handleSort);
};
/**
* Cancel and reset sort procedure.
*
* @private
*/
ItemDrag.prototype._cancelSort = function () {
this._isSortNeeded = false;
if (this._sortTimer !== undefined) {
this._sortTimer = window.clearTimeout(this._sortTimer);
}
cancelDragSortTick(this._item._id);
};
/**
* Handle the ending of the drag procedure for sorting.
*
* @private
*/
ItemDrag.prototype._finishSort = function () {
var isSortEnabled = this._getGrid()._settings.dragSort;
var needsFinalCheck = isSortEnabled && (this._isSortNeeded || this._sortTimer !== undefined);
this._cancelSort();
if (needsFinalCheck) this._checkOverlap();
};
/**
* Check (during drag) if an item is overlapping other items and based on
* the configuration layout the items.
*
* @private
*/
ItemDrag.prototype._checkOverlap = function () {
if (!this._isActive) return;
var item = this._item;
var settings = this._getGrid()._settings;
var result;
var currentGrid;
var currentIndex;
var targetGrid;
var targetIndex;
var targetItem;
var sortAction;
var isMigration;
// Get overlap check result.
if (isFunction(settings.dragSortPredicate)) {
result = settings.dragSortPredicate(item, this._dragMoveEvent);
} else {
result = ItemDrag.defaultSortPredicate(item, settings.dragSortPredicate);
}
// Let's make sure the result object has a valid index before going further.
if (!result || typeof result.index !== 'number') return;
sortAction = result.action === ACTION_SWAP ? ACTION_SWAP : ACTION_MOVE;
currentGrid = item.getGrid();
targetGrid = result.grid || currentGrid;
isMigration = currentGrid !== targetGrid;
currentIndex = currentGrid._items.indexOf(item);
targetIndex = normalizeArrayIndex(
targetGrid._items,
result.index,
isMigration && sortAction === ACTION_MOVE ? 1 : 0
);
// Prevent position bounce.
if (!isMigration && targetIndex === this._blockedSortIndex) {
return;
}
// If the item was moved within it's current grid.
if (!isMigration) {
// Make sure the target index is not the current index.
if (currentIndex !== targetIndex) {
this._blockedSortIndex = currentIndex;
// Do the sort.
(sortAction === ACTION_SWAP ? arraySwap : arrayMove)(
currentGrid._items,
currentIndex,
targetIndex
);
// Emit move event.
if (currentGrid._hasListeners(EVENT_MOVE)) {
currentGrid._emit(EVENT_MOVE, {
item: item,
fromIndex: currentIndex,
toIndex: targetIndex,
action: sortAction,
});
}
// Layout the grid.
currentGrid.layout();
}
}
// If the item was moved to another grid.
else {
this._blockedSortIndex = null;
// Let's fetch the target item when it's still in it's original index.
targetItem = targetGrid._items[targetIndex];
// Emit beforeSend event.
if (currentGrid._hasListeners(EVENT_BEFORE_SEND)) {
currentGrid._emit(EVENT_BEFORE_SEND, {
item: item,
fromGrid: currentGrid,
fromIndex: currentIndex,
toGrid: targetGrid,
toIndex: targetIndex,
});
}
// Emit beforeReceive event.
if (targetGrid._hasListeners(EVENT_BEFORE_RECEIVE)) {
targetGrid._emit(EVENT_BEFORE_RECEIVE, {
item: item,
fromGrid: currentGrid,
fromIndex: currentIndex,
toGrid: targetGrid,
toIndex: targetIndex,
});
}
// Update item's grid id reference.
item._gridId = targetGrid._id;
// Update drag instance's migrating indicator.
this._isMigrating = item._gridId !== this._gridId;
// Move item instance from current grid to target grid.
currentGrid._items.splice(currentIndex, 1);
arrayInsert(targetGrid._items, item, targetIndex);
// Reset sort data.
item._sortData = null;
// Emit send event.
if (currentGrid._hasListeners(EVENT_SEND)) {
currentGrid._emit(EVENT_SEND, {
item: item,
fromGrid: currentGrid,
fromIndex: currentIndex,
toGrid: targetGrid,
toIndex: targetIndex,
});
}
// Emit receive event.
if (targetGrid._hasListeners(EVENT_RECEIVE)) {
targetGrid._emit(EVENT_RECEIVE, {
item: item,
fromGrid: currentGrid,
fromIndex: currentIndex,
toGrid: targetGrid,
toIndex: targetIndex,
});
}
// If the sort action is "swap" let's respect it and send the target item
// (if it exists) from the target grid to the originating grid. This process
// is done on purpose after the dragged item placed within the target grid
// so that we can keep this implementation as simple as possible utilizing
// the existing API.
if (sortAction === ACTION_SWAP && targetItem && targetItem.isActive()) {
// Sanity check to make sure that the target item is still part of the
// target grid. It could have been manipulated in the event handlers.
if (targetGrid._items.indexOf(targetItem) > -1) {
targetGrid.send(targetItem, currentGrid, currentIndex, {
appendTo: this._container || document.body,
layoutSender: false,
layoutReceiver: false,
});
}
}
// Layout both grids.
currentGrid.layout();
targetGrid.layout();
}
};
/**
* If item is dragged into another grid, finish the migration process
* gracefully.
*
* @private
*/
ItemDrag.prototype._finishMigration = function () {
var item = this._item;
var release = item._dragRelease;
var element = item._element;
var isActive = item._isActive;
var targetGrid = item.getGrid();
var targetGridElement = targetGrid._element;
var targetSettings = targetGrid._settings;
var targetContainer = targetSettings.dragContainer || targetGridElement;
var currentSettings = this._getGrid()._settings;
var currentContainer = element.parentNode;
var currentVisClass = isActive
? currentSettings.itemVisibleClass
: currentSettings.itemHiddenClass;
var nextVisClass = isActive ? targetSettings.itemVisibleClass : targetSettings.itemHiddenClass;
var translate;
var offsetDiff;
// Destroy current drag. Note that we need to set the migrating flag to
// false first, because otherwise we create an infinite loop between this
// and the drag.stop() method.
this._isMigrating = false;
this.destroy();
// Update item class.
if (currentSettings.itemClass !== targetSettings.itemClass) {
removeClass(element, currentSettings.itemClass);
addClass(element, targetSettings.itemClass);
}
// Update visibility class.
if (currentVisClass !== nextVisClass) {
removeClass(element, currentVisClass);
addClass(element, nextVisClass);
}
// Move the item inside the target container if it's different than the
// current container.
if (targetContainer !== currentContainer) {
targetContainer.appendChild(element);
offsetDiff = getOffsetDiff(currentContainer, targetContainer, true);
translate = getTranslate(element);
translate.x -= offsetDiff.left;
translate.y -= offsetDiff.top;
}
// Update item's cached dimensions.
item._refreshDimensions();
// Calculate the offset difference between target's drag container (if any)
// and actual grid container element. We save it later for the release
// process.
offsetDiff = getOffsetDiff(targetContainer, targetGridElement, true);
release._containerDiffX = offsetDiff.left;
release._containerDiffY = offsetDiff.top;
// Recreate item's drag handler.
item._drag = targetSettings.dragEnabled ? new ItemDrag(item) : null;
// Adjust the position of the item element if it was moved from a container
// to another.
if (targetContainer !== currentContainer) {
item._setTranslate(translate.x, translate.y);
}
// Update child element's styles to reflect the current visibility state.
item._visibility.setStyles(isActive ? targetSettings.visibleStyles : targetSettings.hiddenStyles);
// Start the release.
release.start();
};
/**
* Drag pre-start handler.
*
* @private
* @param {Object} event
*/
ItemDrag.prototype._preStartCheck = function (event) {
// Let's activate drag start predicate state.
if (this._startPredicateState === START_PREDICATE_INACTIVE) {
this._startPredicateState = START_PREDICATE_PENDING;
}
// If predicate is pending try to resolve it.
if (this._startPredicateState === START_PREDICATE_PENDING) {
this._startPredicateResult = this._startPredicate(this._item, event);
if (this._startPredicateResult === true) {
this._startPredicateState = START_PREDICATE_RESOLVED;
this._onStart(event);
} else if (this._startPredicateResult === false) {
this._resetStartPredicate(event);
this._dragger._reset();
this._startPredicateState = START_PREDICATE_INACTIVE;
}
}
// Otherwise if predicate is resolved and drag is active, move the item.
else if (this._startPredicateState === START_PREDICATE_RESOLVED && this._isActive) {
this._onMove(event);
}
};
/**
* Drag pre-end handler.
*
* @private
* @param {Object} event
*/
ItemDrag.prototype._preEndCheck = function (event) {
var isResolved = this._startPredicateState === START_PREDICATE_RESOLVED;
// Do final predicate check to allow user to unbind stuff for the current
// drag procedure within the predicate callback. The return value of this
// check will have no effect to the state of the predicate.
this._startPredicate(this._item, event);
this._startPredicateState = START_PREDICATE_INACTIVE;
if (!isResolved || !this._isActive) return;
if (this._isStarted) {
this._onEnd(event);
} else {
this.stop();
}
};
/**
* Drag start handler.
*
* @private
* @param {Object} event
*/
ItemDrag.prototype._onStart = function (event) {
var item = this._item;
if (!item._isActive) return;
this._isActive = true;
this._dragStartEvent = event;
ItemDrag.autoScroller.addItem(item);
addDragStartTick(item._id, this._prepareStart, this._applyStart);
};
/**
* Prepare item to be dragged.
*
* @private
* ItemDrag.prototype
*/
ItemDrag.prototype._prepareStart = function () {
var item = this._item;
if (!item._isActive) return;
var element = item._element;
var grid = this._getGrid();
var settings = grid._settings;
var gridContainer = grid._element;
var dragContainer = settings.dragContainer || gridContainer;
var containingBlock = getContainingBlock(dragContainer);
var translate = getTranslate(element);
var elementRect = element.getBoundingClientRect();
var hasDragContainer = dragContainer !== gridContainer;
this._container = dragContainer;
this._containingBlock = containingBlock;
this._clientX = elementRect.left;
this._clientY = elementRect.top;
this._left = this._gridX = translate.x;
this._top = this._gridY = translate.y;
this._scrollDiffX = this._scrollDiffY = 0;
this._moveDiffX = this._moveDiffY = 0;
this._resetHeuristics(this._gridX, this._gridY);
// If a specific drag container is set and it is different from the
// grid's container element we store the offset between containers.
if (hasDragContainer) {
var offsetDiff = getOffsetDiff(containingBlock, gridContainer);
this._containerDiffX = offsetDiff.left;
this._containerDiffY = offsetDiff.top;
}
};
/**
* Start drag for the item.
*
* @private
*/
ItemDrag.prototype._applyStart = function () {
var item = this._item;
if (!item._isActive) return;
var grid = this._getGrid();
var element = item._element;
var release = item._dragRelease;
var migrate = item._migrate;
var hasDragContainer = this._container !== grid._element;
if (item.isPositioning()) {
item._layout.stop(true, this._left, this._top);
}
if (migrate._isActive) {
this._left -= migrate._containerDiffX;
this._top -= migrate._containerDiffY;
this._gridX -= migrate._containerDiffX;
this._gridY -= migrate._containerDiffY;
migrate.stop(true, this._left, this._top);
}
if (item.isReleasing()) {
release._reset();
}
if (grid._settings.dragPlaceholder.enabled) {
item._dragPlaceholder.create();
}
this._isStarted = true;
grid._emit(EVENT_DRAG_INIT, item, this._dragStartEvent);
if (hasDragContainer) {
// If the dragged element is a child of the drag container all we need to
// do is setup the relative drag position data.
if (element.parentNode === this._container) {
this._gridX -= this._containerDiffX;
this._gridY -= this._containerDiffY;
}
// Otherwise we need to append the element inside the correct container,
// setup the actual drag position data and adjust the element's translate
// values to account for the DOM position shift.
else {
this._left += this._containerDiffX;
this._top += this._containerDiffY;
this._container.appendChild(element);
item._setTranslate(this._left, this._top);
}
}
addClass(element, grid._settings.itemDraggingClass);
this._bindScrollListeners();
grid._emit(EVENT_DRAG_START, item, this._dragStartEvent);
};
/**
* Drag move handler.
*
* @private
* @param {Object} event
*/
ItemDrag.prototype._onMove = function (event) {
var item = this._item;
if (!item._isActive) {
this.stop();
return;
}
this._dragMoveEvent = event;
addDragMoveTick(item._id, this._prepareMove, this._applyMove);
addDragSortTick(item._id, this._handleSort);
};
/**
* Prepare dragged item for moving.
*
* @private
*/
ItemDrag.prototype._prepareMove = function () {
var item = this._item;
if (!item._isActive) return;
var settings = this._getGrid()._settings;
var axis = settings.dragAxis;
var nextEvent = this._dragMoveEvent;
var prevEvent = this._dragPrevMoveEvent || this._dragStartEvent || nextEvent;
// Update horizontal position data.
if (axis !== 'y') {
var moveDiffX = nextEvent.clientX - prevEvent.clientX;
this._left = this._left - this._moveDiffX + moveDiffX;
this._gridX = this._gridX - this._moveDiffX + moveDiffX;
this._clientX = this._clientX - this._moveDiffX + moveDiffX;
this._moveDiffX = moveDiffX;
}
// Update vertical position data.
if (axis !== 'x') {
var moveDiffY = nextEvent.clientY - prevEvent.clientY;
this._top = this._top - this._moveDiffY + moveDiffY;
this._gridY = this._gridY - this._moveDiffY + moveDiffY;
this._clientY = this._clientY - this._moveDiffY + moveDiffY;
this._moveDiffY = moveDiffY;
}
this._dragPrevMoveEvent = nextEvent;
};
/**
* Apply movement to dragged item.
*
* @private
*/
ItemDrag.prototype._applyMove = function () {
var item = this._item;
if (!item._isActive) return;
this._moveDiffX = this._moveDiffY = 0;
item._setTranslate(this._left, this._top);
this._getGrid()._emit(EVENT_DRAG_MOVE, item, this._dragMoveEvent);
ItemDrag.autoScroller.updateItem(item);
};
/**
* Drag scroll handler.
*
* @private
* @param {Object} event
*/
ItemDrag.prototype._onScroll = function (event) {
var item = this._item;
if (!item._isActive) {
this.stop();
return;
}
this._scrollEvent = event;
addDragScrollTick(item._id, this._prepareScroll, this._applyScroll);
addDragSortTick(item._id, this._handleSort);
};
/**
* Prepare dragged item for scrolling.
*
* @private
*/
ItemDrag.prototype._prepareScroll = function () {
var item = this._item;
// If item is not active do nothing.
if (!item._isActive) return;
var element = item._element;
var grid = this._getGrid();
var gridContainer = grid._element;
var axis = grid._settings.dragAxis;
var moveX = axis !== 'y';
var moveY = axis !== 'x';
var rect = element.getBoundingClientRect();
// Update container diff.
if (this._container !== gridContainer) {
var offsetDiff = getOffsetDiff(this._containingBlock, gridContainer);
this._containerDiffX = offsetDiff.left;
this._containerDiffY = offsetDiff.top;
}
// Update horizontal position data.
if (moveX) {
var scrollDiffX = this._clientX - this._moveDiffX - this._scrollDiffX - rect.left;
this._left = this._left - this._scrollDiffX + scrollDiffX;
this._scrollDiffX = scrollDiffX;
}
// Update vertical position data.
if (moveY) {
var scrollDiffY = this._clientY - this._moveDiffY - this._scrollDiffY - rect.top;
this._top = this._top - this._scrollDiffY + scrollDiffY;
this._scrollDiffY = scrollDiffY;
}
// Update grid position.
this._gridX = this._left - this._containerDiffX;
this._gridY = this._top - this._containerDiffY;
};
/**
* Apply scroll to dragged item.
*
* @private
*/
ItemDrag.prototype._applyScroll = function () {
var item = this._item;
if (!item._isActive) return;
this._scrollDiffX = this._scrollDiffY = 0;
item._setTranslate(this._left, this._top);
this._getGrid()._emit(EVENT_DRAG_SCROLL, item, this._scrollEvent);
};
/**
* Drag end handler.
*
* @private
* @param {Object} event
*/
ItemDrag.prototype._onEnd = function (event) {
var item = this._item;
var element = item._element;
var grid = this._getGrid();
var settings = grid._settings;
var release = item._dragRelease;
// If item is not active, reset drag.
if (!item._isActive) {
this.stop();
return;
}
// Cancel queued ticks.
cancelDragStartTick(item._id);
cancelDragMoveTick(item._id);
cancelDragScrollTick(item._id);
// Finish sort procedure (does final overlap check if needed).
this._finishSort();
// Remove scroll listeners.
this._unbindScrollListeners();
// Setup release data.
release._containerDiffX = this._containerDiffX;
release._containerDiffY = this._containerDiffY;
// Reset drag data.
this._reset();
// Remove drag class name from element.
removeClass(element, settings.itemDraggingClass);
// Stop auto-scroll.
ItemDrag.autoScroller.removeItem(item);
// Emit dragEnd event.
grid._emit(EVENT_DRAG_END, item, event);
// Finish up the migration process or start the release process.
this._isMigrating ? this._finishMigration() : release.start();
};
/**
* Private helpers
* ***************
*/
/**
* Check if an element is an anchor element and open the href url if possible.
*
* @param {HTMLElement} element
*/
function openAnchorHref(element) {
// Make sure the element is anchor element.
if (element.tagName.toLowerCase() !== 'a') return;
// Get href and make sure it exists.
var href = element.getAttribute('href');
if (!href) return;
// Finally let's navigate to the link href.
var target = element.getAttribute('target');
if (target && target !== '_self') {
window.open(href, target);
} else {
window.location.href = href;
}
}
/**
* Get current values of the provided styles definition object or array.
*
* @param {HTMLElement} element
* @param {(Object|Array} styles
* @return {Object}
*/
function getCurrentStyles(element, styles) {
var result = {};
var prop, i;
if (Array.isArray(styles)) {
for (i = 0; i < styles.length; i++) {
prop = styles[i];
result[prop] = getStyle(element, getStyleName(prop));
}
} else {
for (prop in styles) {
result[prop] = getStyle(element, getStyleName(prop));
}
}
return result;
}
var unprefixRegEx = /^(webkit|moz|ms|o|Webkit|Moz|MS|O)(?=[A-Z])/;
var cache$2 = {};
/**
* Remove any potential vendor prefixes from a property name.
*
* @param {String} prop
* @returns {String}
*/
function getUnprefixedPropName(prop) {
var result = cache$2[prop];
if (result) return result;
result = prop.replace(unprefixRegEx, '');
if (result !== prop) {
result = result[0].toLowerCase() + result.slice(1);
}
cache$2[prop] = result;
return result;
}
var nativeCode = '[native code]';
/**
* Check if a value (e.g. a method or constructor) is native code. Good for
* detecting when a polyfill is used and when not.
*
* @param {*} feat
* @returns {Boolean}
*/
function isNative(feat) {
var S = window.Symbol;
return !!(
feat &&
isFunction(S) &&
isFunction(S.toString) &&
S(feat).toString().indexOf(nativeCode) > -1
);
}
/**
* Set inline styles to an element.
*
* @param {HTMLElement} element
* @param {Object} styles
*/
function setStyles(element, styles) {
for (var prop in styles) {
element.style[prop] = styles[prop];
}
}
var HAS_WEB_ANIMATIONS = !!(Element && isFunction(Element.prototype.animate));
var HAS_NATIVE_WEB_ANIMATIONS = !!(Element && isNative(Element.prototype.animate));
/**
* Item animation handler powered by Web Animations API.
*
* @class
* @param {HTMLElement} element
*/
function Animator(element) {
this._element = element;
this._animation = null;
this._duration = 0;
this._easing = '';
this._callback = null;
this._props = [];
this._values = [];
this._isDestroyed = false;
this._onFinish = this._onFinish.bind(this);
}
/**
* Public prototype methods
* ************************
*/
/**
* Start instance's animation. Automatically stops current animation if it is
* running.
*
* @public
* @param {Object} propsFrom
* @param {Object} propsTo
* @param {Object} [options]
* @param {Number} [options.duration=300]
* @param {String} [options.easing='ease']
* @param {Function} [options.onFinish]
*/
Animator.prototype.start = function (propsFrom, propsTo, options) {
if (this._isDestroyed) return;
var element = this._element;
var opts = options || {};
// If we don't have web animations available let's not animate.
if (!HAS_WEB_ANIMATIONS) {
setStyles(element, propsTo);
this._callback = isFunction(opts.onFinish) ? opts.onFinish : null;
this._onFinish();
return;
}
var animation = this._animation;
var currentProps = this._props;
var currentValues = this._values;
var duration = opts.duration || 300;
var easing = opts.easing || 'ease';
var cancelAnimation = false;
var propName, propCount, propIndex;
// If we have an existing animation running, let's check if it needs to be
// cancelled or if it can continue running.
if (animation) {
propCount = 0;
// Cancel animation if duration or easing has changed.
if (duration !== this._duration || easing !== this._easing) {
cancelAnimation = true;
}
// Check if the requested animation target props and values match with the
// current props and values.
if (!cancelAnimation) {
for (propName in propsTo) {
++propCount;
propIndex = currentProps.indexOf(propName);
if (propIndex === -1 || propsTo[propName] !== currentValues[propIndex]) {
cancelAnimation = true;
break;
}
}
// Check if the target props count matches current props count. This is
// needed for the edge case scenario where target props contain the same
// styles as current props, but the current props have some additional
// props.
if (propCount !== currentProps.length) {
cancelAnimation = true;
}
}
}
// Cancel animation (if required).
if (cancelAnimation) animation.cancel();
// Store animation callback.
this._callback = isFunction(opts.onFinish) ? opts.onFinish : null;
// If we have a running animation that does not need to be cancelled, let's
// call it a day here and let it run.
if (animation && !cancelAnimation) return;
// Store target props and values to instance.
currentProps.length = currentValues.length = 0;
for (propName in propsTo) {
currentProps.push(propName);
currentValues.push(propsTo[propName]);
}
// Start the animation. We need to provide unprefixed property names to the
// Web Animations polyfill if it is being used. If we have native Web
// Animations available we need to provide prefixed properties instead.
this._duration = duration;
this._easing = easing;
this._animation = element.animate(
[
createFrame(propsFrom, HAS_NATIVE_WEB_ANIMATIONS),
createFrame(propsTo, HAS_NATIVE_WEB_ANIMATIONS),
],
{
duration: duration,
easing: easing,
}
);
this._animation.onfinish = this._onFinish;
// Set the end styles. This makes sure that the element stays at the end
// values after animation is finished.
setStyles(element, propsTo);
};
/**
* Stop instance's current animation if running.
*
* @public
*/
Animator.prototype.stop = function () {
if (this._isDestroyed || !this._animation) return;
this._animation.cancel();
this._animation = this._callback = null;
this._props.length = this._values.length = 0;
};
/**
* Read the current values of the element's animated styles from the DOM.
*
* @public
* @return {Object}
*/
Animator.prototype.getCurrentStyles = function () {
return getCurrentStyles(element, currentProps);
};
/**
* Check if the item is being animated currently.
*
* @public
* @return {Boolean}
*/
Animator.prototype.isAnimating = function () {
return !!this._animation;
};
/**
* Destroy the instance and stop current animation if it is running.
*
* @public
*/
Animator.prototype.destroy = function () {
if (this._isDestroyed) return;
this.stop();
this._element = null;
this._isDestroyed = true;
};
/**
* Private prototype methods
* *************************
*/
/**
* Animation end handler.
*
* @private
*/
Animator.prototype._onFinish = function () {
var callback = this._callback;
this._animation = this._callback = null;
this._props.length = this._values.length = 0;
callback && callback();
};
/**
* Private helpers
* ***************
*/
function createFrame(props, prefix) {
var frame = {};
for (var prop in props) {
frame[prefix ? prop : getUnprefixedPropName(prop)] = props[prop];
}
return frame;
}
/**
* Transform translateX and translateY value into CSS transform style
* property's value.
*
* @param {Number} x
* @param {Number} y
* @returns {String}
*/
function getTranslateString(x, y) {
return 'translateX(' + x + 'px) translateY(' + y + 'px)';
}
/**
* Drag placeholder.
*
* @class
* @param {Item} item
*/
function ItemDragPlaceholder(item) {
this._item = item;
this._animation = new Animator();
this._element = null;
this._className = '';
this._didMigrate = false;
this._resetAfterLayout = false;
this._left = 0;
this._top = 0;
this._transX = 0;
this._transY = 0;
this._nextTransX = 0;
this._nextTransY = 0;
// Bind animation handlers.
this._setupAnimation = this._setupAnimation.bind(this);
this._startAnimation = this._startAnimation.bind(this);
this._updateDimensions = this._updateDimensions.bind(this);
// Bind event handlers.
this._onLayoutStart = this._onLayoutStart.bind(this);
this._onLayoutEnd = this._onLayoutEnd.bind(this);
this._onReleaseEnd = this._onReleaseEnd.bind(this);
this._onMigrate = this._onMigrate.bind(this);
this._onHide = this._onHide.bind(this);
}
/**
* Private prototype methods
* *************************
*/
/**
* Update placeholder's dimensions to match the item's dimensions.
*
* @private
*/
ItemDragPlaceholder.prototype._updateDimensions = function () {
if (!this.isActive()) return;
setStyles(this._element, {
width: this._item._width + 'px',
height: this._item._height + 'px',
});
};
/**
* Move placeholder to a new position.
*
* @private
* @param {Item[]} items
* @param {Boolean} isInstant
*/
ItemDragPlaceholder.prototype._onLayoutStart = function (items, isInstant) {
var item = this._item;
// If the item is not part of the layout anymore reset placeholder.
if (items.indexOf(item) === -1) {
this.reset();
return;
}
var nextLeft = item._left;
var nextTop = item._top;
var currentLeft = this._left;
var currentTop = this._top;
// Keep track of item layout position.
this._left = nextLeft;
this._top = nextTop;
// If item's position did not change, and the item did not migrate and the
// layout is not instant and we can safely skip layout.
if (!isInstant && !this._didMigrate && currentLeft === nextLeft && currentTop === nextTop) {
return;
}
// Slots data is calculated with item margins added to them so we need to add
// item's left and top margin to the slot data to get the placeholder's
// next position.
var nextX = nextLeft + item._marginLeft;
var nextY = nextTop + item._marginTop;
// Just snap to new position without any animations if no animation is
// required or if placeholder moves between grids.
var grid = item.getGrid();
var animEnabled = !isInstant && grid._settings.layoutDuration > 0;
if (!animEnabled || this._didMigrate) {
// Cancel potential (queued) layout tick.
cancelPlaceholderLayoutTick(item._id);
// Snap placeholder to correct position.
this._element.style[transformProp] = getTranslateString(nextX, nextY);
this._animation.stop();
// Move placeholder inside correct container after migration.
if (this._didMigrate) {
grid.getElement().appendChild(this._element);
this._didMigrate = false;
}
return;
}
// Start the placeholder's layout animation in the next tick. We do this to
// avoid layout thrashing.
this._nextTransX = nextX;
this._nextTransY = nextY;
addPlaceholderLayoutTick(item._id, this._setupAnimation, this._startAnimation);
};
/**
* Prepare placeholder for layout animation.
*
* @private
*/
ItemDragPlaceholder.prototype._setupAnimation = function () {
if (!this.isActive()) return;
var translate = getTranslate(this._element);
this._transX = translate.x;
this._transY = translate.y;
};
/**
* Start layout animation.
*
* @private
*/
ItemDragPlaceholder.prototype._startAnimation = function () {
if (!this.isActive()) return;
var animation = this._animation;
var currentX = this._transX;
var currentY = this._transY;
var nextX = this._nextTransX;
var nextY = this._nextTransY;
// If placeholder is already in correct position let's just stop animation
// and be done with it.
if (currentX === nextX && currentY === nextY) {
if (animation.isAnimating()) {
this._element.style[transformProp] = getTranslateString(nextX, nextY);
animation.stop();
}
return;
}
// Otherwise let's start the animation.
var settings = this._item.getGrid()._settings;
var currentStyles = {};
var targetStyles = {};
currentStyles[transformProp] = getTranslateString(currentX, currentY);
targetStyles[transformProp] = getTranslateString(nextX, nextY);
animation.start(currentStyles, targetStyles, {
duration: settings.layoutDuration,
easing: settings.layoutEasing,
onFinish: this._onLayoutEnd,
});
};
/**
* Layout end handler.
*
* @private
*/
ItemDragPlaceholder.prototype._onLayoutEnd = function () {
if (this._resetAfterLayout) {
this.reset();
}
};
/**
* Drag end handler. This handler is called when dragReleaseEnd event is
* emitted and receives the event data as it's argument.
*
* @private
* @param {Item} item
*/
ItemDragPlaceholder.prototype._onReleaseEnd = function (item) {
if (item._id === this._item._id) {
// If the placeholder is not animating anymore we can safely reset it.
if (!this._animation.isAnimating()) {
this.reset();
return;
}
// If the placeholder item is still animating here, let's wait for it to
// finish it's animation.
this._resetAfterLayout = true;
}
};
/**
* Migration start handler. This handler is called when beforeSend event is
* emitted and receives the event data as it's argument.
*
* @private
* @param {Object} data
* @param {Item} data.item
* @param {Grid} data.fromGrid
* @param {Number} data.fromIndex
* @param {Grid} data.toGrid
* @param {Number} data.toIndex
*/
ItemDragPlaceholder.prototype._onMigrate = function (data) {
// Make sure we have a matching item.
if (data.item !== this._item) return;
var grid = this._item.getGrid();
var nextGrid = data.toGrid;
// Unbind listeners from current grid.
grid.off(EVENT_DRAG_RELEASE_END, this._onReleaseEnd);
grid.off(EVENT_LAYOUT_START, this._onLayoutStart);
grid.off(EVENT_BEFORE_SEND, this._onMigrate);
grid.off(EVENT_HIDE_START, this._onHide);
// Bind listeners to the next grid.
nextGrid.on(EVENT_DRAG_RELEASE_END, this._onReleaseEnd);
nextGrid.on(EVENT_LAYOUT_START, this._onLayoutStart);
nextGrid.on(EVENT_BEFORE_SEND, this._onMigrate);
nextGrid.on(EVENT_HIDE_START, this._onHide);
// Mark the item as migrated.
this._didMigrate = true;
};
/**
* Reset placeholder if the associated item is hidden.
*
* @private
* @param {Item[]} items
*/
ItemDragPlaceholder.prototype._onHide = function (items) {
if (items.indexOf(this._item) > -1) this.reset();
};
/**
* Public prototype methods
* ************************
*/
/**
* Create placeholder. Note that this method only writes to DOM and does not
* read anything from DOM so it should not cause any additional layout
* thrashing when it's called at the end of the drag start procedure.
*
* @public
*/
ItemDragPlaceholder.prototype.create = function () {
// If we already have placeholder set up we can skip the initiation logic.
if (this.isActive()) {
this._resetAfterLayout = false;
return;
}
var item = this._item;
var grid = item.getGrid();
var settings = grid._settings;
var animation = this._animation;
// Keep track of layout position.
this._left = item._left;
this._top = item._top;
// Create placeholder element.
var element;
if (isFunction(settings.dragPlaceholder.createElement)) {
element = settings.dragPlaceholder.createElement(item);
} else {
element = document.createElement('div');
}
this._element = element;
// Update element to animation instance.
animation._element = element;
// Add placeholder class to the placeholder element.
this._className = settings.itemPlaceholderClass || '';
if (this._className) {
addClass(element, this._className);
}
// Set initial styles.
setStyles(element, {
position: 'absolute',
left: '0px',
top: '0px',
width: item._width + 'px',
height: item._height + 'px',
});
// Set initial position.
element.style[transformProp] = getTranslateString(
item._left + item._marginLeft,
item._top + item._marginTop
);
// Bind event listeners.
grid.on(EVENT_LAYOUT_START, this._onLayoutStart);
grid.on(EVENT_DRAG_RELEASE_END, this._onReleaseEnd);
grid.on(EVENT_BEFORE_SEND, this._onMigrate);
grid.on(EVENT_HIDE_START, this._onHide);
// onCreate hook.
if (isFunction(settings.dragPlaceholder.onCreate)) {
settings.dragPlaceholder.onCreate(item, element);
}
// Insert the placeholder element to the grid.
grid.getElement().appendChild(element);
};
/**
* Reset placeholder data.
*
* @public
*/
ItemDragPlaceholder.prototype.reset = function () {
if (!this.isActive()) return;
var element = this._element;
var item = this._item;
var grid = item.getGrid();
var settings = grid._settings;
var animation = this._animation;
// Reset flag.
this._resetAfterLayout = false;
// Cancel potential (queued) layout tick.
cancelPlaceholderLayoutTick(item._id);
cancelPlaceholderResizeTick(item._id);
// Reset animation instance.
animation.stop();
animation._element = null;
// Unbind event listeners.
grid.off(EVENT_DRAG_RELEASE_END, this._onReleaseEnd);
grid.off(EVENT_LAYOUT_START, this._onLayoutStart);
grid.off(EVENT_BEFORE_SEND, this._onMigrate);
grid.off(EVENT_HIDE_START, this._onHide);
// Remove placeholder class from the placeholder element.
if (this._className) {
removeClass(element, this._className);
this._className = '';
}
// Remove element.
element.parentNode.removeChild(element);
this._element = null;
// onRemove hook. Note that here we use the current grid's onRemove callback
// so if the item has migrated during drag the onRemove method will not be
// the originating grid's method.
if (isFunction(settings.dragPlaceholder.onRemove)) {
settings.dragPlaceholder.onRemove(item, element);
}
};
/**
* Check if placeholder is currently active (visible).
*
* @public
* @returns {Boolean}
*/
ItemDragPlaceholder.prototype.isActive = function () {
return !!this._element;
};
/**
* Get placeholder element.
*
* @public
* @returns {?HTMLElement}
*/
ItemDragPlaceholder.prototype.getElement = function () {
return this._element;
};
/**
* Update placeholder's dimensions to match the item's dimensions. Note that
* the updating is done asynchronously in the next tick to avoid layout
* thrashing.
*
* @public
*/
ItemDragPlaceholder.prototype.updateDimensions = function () {
if (!this.isActive()) return;
addPlaceholderResizeTick(this._item._id, this._updateDimensions);
};
/**
* Destroy placeholder instance.
*
* @public
*/
ItemDragPlaceholder.prototype.destroy = function () {
this.reset();
this._animation.destroy();
this._item = this._animation = null;
};
/**
* The release process handler constructor. Although this might seem as proper
* fit for the drag process this needs to be separated into it's own logic
* because there might be a scenario where drag is disabled, but the release
* process still needs to be implemented (dragging from a grid to another).
*
* @class
* @param {Item} item
*/
function ItemDragRelease(item) {
this._item = item;
this._isActive = false;
this._isDestroyed = false;
this._isPositioningStarted = false;
this._containerDiffX = 0;
this._containerDiffY = 0;
}
/**
* Public prototype methods
* ************************
*/
/**
* Start the release process of an item.
*
* @public
*/
ItemDragRelease.prototype.start = function () {
if (this._isDestroyed || this._isActive) return;
var item = this._item;
var grid = item.getGrid();
var settings = grid._settings;
this._isActive = true;
addClass(item._element, settings.itemReleasingClass);
if (!settings.dragRelease.useDragContainer) {
this._placeToGrid();
}
grid._emit(EVENT_DRAG_RELEASE_START, item);
// Let's start layout manually _only_ if there is no unfinished layout in
// about to finish.
if (!grid._nextLayoutData) item._layout.start(false);
};
/**
* End the release process of an item. This method can be used to abort an
* ongoing release process (animation) or finish the release process.
*
* @public
* @param {Boolean} [abort=false]
* - Should the release be aborted? When true, the release end event won't be
* emitted. Set to true only when you need to abort the release process
* while the item is animating to it's position.
* @param {Number} [left]
* - The element's current translateX value (optional).
* @param {Number} [top]
* - The element's current translateY value (optional).
*/
ItemDragRelease.prototype.stop = function (abort, left, top) {
if (this._isDestroyed || !this._isActive) return;
var item = this._item;
var grid = item.getGrid();
if (!abort && (left === undefined || top === undefined)) {
left = item._left;
top = item._top;
}
var didReparent = this._placeToGrid(left, top);
this._reset(didReparent);
if (!abort) grid._emit(EVENT_DRAG_RELEASE_END, item);
};
ItemDragRelease.prototype.isJustReleased = function () {
return this._isActive && this._isPositioningStarted === false;
};
/**
* Destroy instance.
*
* @public
*/
ItemDragRelease.prototype.destroy = function () {
if (this._isDestroyed) return;
this.stop(true);
this._item = null;
this._isDestroyed = true;
};
/**
* Private prototype methods
* *************************
*/
/**
* Move the element back to the grid container element if it does not exist
* there already.
*
* @private
* @param {Number} [left]
* - The element's current translateX value (optional).
* @param {Number} [top]
* - The element's current translateY value (optional).
* @returns {Boolean}
* - Returns `true` if the element was reparented.
*/
ItemDragRelease.prototype._placeToGrid = function (left, top) {
if (this._isDestroyed) return;
var item = this._item;
var element = item._element;
var container = item.getGrid()._element;
var didReparent = false;
if (element.parentNode !== container) {
if (left === undefined || top === undefined) {
var translate = getTranslate(element);
left = translate.x - this._containerDiffX;
top = translate.y - this._containerDiffY;
}
container.appendChild(element);
item._setTranslate(left, top);
didReparent = true;
}
this._containerDiffX = 0;
this._containerDiffY = 0;
return didReparent;
};
/**
* Reset data and remove releasing class.
*
* @private
* @param {Boolean} [needsReflow]
*/
ItemDragRelease.prototype._reset = function (needsReflow) {
if (this._isDestroyed) return;
var item = this._item;
var releasingClass = item.getGrid()._settings.itemReleasingClass;
this._isActive = false;
this._isPositioningStarted = false;
this._containerDiffX = 0;
this._containerDiffY = 0;
// If the element was just reparented we need to do a forced reflow to remove
// the class gracefully.
if (releasingClass) {
// eslint-disable-next-line
if (needsReflow) item._element.clientWidth;
removeClass(item._element, releasingClass);
}
};
var MIN_ANIMATION_DISTANCE = 2;
/**
* Layout manager for Item instance, handles the positioning of an item.
*
* @class
* @param {Item} item
*/
function ItemLayout(item) {
var element = item._element;
var elementStyle = element.style;
this._item = item;
this._isActive = false;
this._isDestroyed = false;
this._isInterrupted = false;
this._currentStyles = {};
this._targetStyles = {};
this._nextLeft = 0;
this._nextTop = 0;
this._offsetLeft = 0;
this._offsetTop = 0;
this._skipNextAnimation = false;
this._animOptions = {
onFinish: this._finish.bind(this),
duration: 0,
easing: 0,
};
// Set element's initial position styles.
elementStyle.left = '0px';
elementStyle.top = '0px';
item._setTranslate(0, 0);
this._animation = new Animator(element);
this._queue = 'layout-' + item._id;
// Bind animation handlers and finish method.
this._setupAnimation = this._setupAnimation.bind(this);
this._startAnimation = this._startAnimation.bind(this);
}
/**
* Public prototype methods
* ************************
*/
/**
* Start item layout based on it's current data.
*
* @public
* @param {Boolean} instant
* @param {Function} [onFinish]
*/
ItemLayout.prototype.start = function (instant, onFinish) {
if (this._isDestroyed) return;
var item = this._item;
var release = item._dragRelease;
var gridSettings = item.getGrid()._settings;
var isPositioning = this._isActive;
var isJustReleased = release.isJustReleased();
var animDuration = isJustReleased
? gridSettings.dragRelease.duration
: gridSettings.layoutDuration;
var animEasing = isJustReleased ? gridSettings.dragRelease.easing : gridSettings.layoutEasing;
var animEnabled = !instant && !this._skipNextAnimation && animDuration > 0;
// If the item is currently positioning cancel potential queued layout tick
// and process current layout callback queue with interrupted flag on.
if (isPositioning) {
cancelLayoutTick(item._id);
item._emitter.burst(this._queue, true, item);
}
// Mark release positioning as started.
if (isJustReleased) release._isPositioningStarted = true;
// Push the callback to the callback queue.
if (isFunction(onFinish)) {
item._emitter.on(this._queue, onFinish);
}
// Reset animation skipping flag.
this._skipNextAnimation = false;
// If no animations are needed, easy peasy!
if (!animEnabled) {
this._updateOffsets();
item._setTranslate(this._nextLeft, this._nextTop);
this._animation.stop();
this._finish();
return;
}
// Kick off animation to be started in the next tick.
this._isActive = true;
this._animOptions.easing = animEasing;
this._animOptions.duration = animDuration;
this._isInterrupted = isPositioning;
addLayoutTick(item._id, this._setupAnimation, this._startAnimation);
};
/**
* Stop item's position animation if it is currently animating.
*
* @public
* @param {Boolean} processCallbackQueue
* @param {Number} [left]
* @param {Number} [top]
*/
ItemLayout.prototype.stop = function (processCallbackQueue, left, top) {
if (this._isDestroyed || !this._isActive) return;
var item = this._item;
// Cancel animation init.
cancelLayoutTick(item._id);
// Stop animation.
if (this._animation.isAnimating()) {
if (left === undefined || top === undefined) {
var translate = getTranslate(item._element);
left = translate.x;
top = translate.y;
}
item._setTranslate(left, top);
this._animation.stop();
}
// Remove positioning class.
removeClass(item._element, item.getGrid()._settings.itemPositioningClass);
// Reset active state.
this._isActive = false;
// Process callback queue if needed.
if (processCallbackQueue) {
item._emitter.burst(this._queue, true, item);
}
};
/**
* Destroy the instance and stop current animation if it is running.
*
* @public
*/
ItemLayout.prototype.destroy = function () {
if (this._isDestroyed) return;
var elementStyle = this._item._element.style;
this.stop(true, 0, 0);
this._item._emitter.clear(this._queue);
this._animation.destroy();
elementStyle[transformProp] = '';
elementStyle.left = '';
elementStyle.top = '';
this._item = null;
this._currentStyles = null;
this._targetStyles = null;
this._animOptions = null;
this._isDestroyed = true;
};
/**
* Private prototype methods
* *************************
*/
/**
* Calculate and update item's current layout offset data.
*
* @private
*/
ItemLayout.prototype._updateOffsets = function () {
if (this._isDestroyed) return;
var item = this._item;
var migrate = item._migrate;
var release = item._dragRelease;
this._offsetLeft = release._isActive
? release._containerDiffX
: migrate._isActive
? migrate._containerDiffX
: 0;
this._offsetTop = release._isActive
? release._containerDiffY
: migrate._isActive
? migrate._containerDiffY
: 0;
this._nextLeft = this._item._left + this._offsetLeft;
this._nextTop = this._item._top + this._offsetTop;
};
/**
* Finish item layout procedure.
*
* @private
*/
ItemLayout.prototype._finish = function () {
if (this._isDestroyed) return;
var item = this._item;
var migrate = item._migrate;
var release = item._dragRelease;
// Update internal translate values.
item._tX = this._nextLeft;
item._tY = this._nextTop;
// Mark the item as inactive and remove positioning classes.
if (this._isActive) {
this._isActive = false;
removeClass(item._element, item.getGrid()._settings.itemPositioningClass);
}
// Finish up release and migration.
if (release._isActive) release.stop();
if (migrate._isActive) migrate.stop();
// Process the callback queue.
item._emitter.burst(this._queue, false, item);
};
/**
* Prepare item for layout animation.
*
* @private
*/
ItemLayout.prototype._setupAnimation = function () {
var item = this._item;
if (item._tX === undefined || item._tY === undefined) {
var translate = getTranslate(item._element);
item._tX = translate.x;
item._tY = translate.y;
}
};
/**
* Start layout animation.
*
* @private
*/
ItemLayout.prototype._startAnimation = function () {
var item = this._item;
var settings = item.getGrid()._settings;
var isInstant = this._animOptions.duration <= 0;
// Let's update the offset data and target styles.
this._updateOffsets();
var xDiff = Math.abs(item._left - (item._tX - this._offsetLeft));
var yDiff = Math.abs(item._top - (item._tY - this._offsetTop));
// If there is no need for animation or if the item is already in correct
// position (or near it) let's finish the process early.
if (isInstant || (xDiff < MIN_ANIMATION_DISTANCE && yDiff < MIN_ANIMATION_DISTANCE)) {
if (xDiff || yDiff || this._isInterrupted) {
item._setTranslate(this._nextLeft, this._nextTop);
}
this._animation.stop();
this._finish();
return;
}
// Set item's positioning class if needed.
if (!this._isInterrupted) {
addClass(item._element, settings.itemPositioningClass);
}
// Get current/next styles for animation.
this._currentStyles[transformProp] = getTranslateString(item._tX, item._tY);
this._targetStyles[transformProp] = getTranslateString(this._nextLeft, this._nextTop);
// Set internal translation values to undefined for the duration of the
// animation since they will be changing on each animation frame for the
// duration of the animation and tracking them would mean reading the DOM on
// each frame, which is pretty darn expensive.
item._tX = item._tY = undefined;
// Start animation.
this._animation.start(this._currentStyles, this._targetStyles, this._animOptions);
};
/**
* The migrate process handler constructor.
*
* @class
* @param {Item} item
*/
function ItemMigrate(item) {
// Private props.
this._item = item;
this._isActive = false;
this._isDestroyed = false;
this._container = false;
this._containerDiffX = 0;
this._containerDiffY = 0;
}
/**
* Public prototype methods
* ************************
*/
/**
* Start the migrate process of an item.
*
* @public
* @param {Grid} targetGrid
* @param {(HTMLElement|Number|Item)} position
* @param {HTMLElement} [container]
*/
ItemMigrate.prototype.start = function (targetGrid, position, container) {
if (this._isDestroyed) return;
var item = this._item;
var element = item._element;
var isActive = item.isActive();
var isVisible = item.isVisible();
var grid = item.getGrid();
var settings = grid._settings;
var targetSettings = targetGrid._settings;
var targetElement = targetGrid._element;
var targetItems = targetGrid._items;
var currentIndex = grid._items.indexOf(item);
var targetContainer = container || document.body;
var targetIndex;
var targetItem;
var currentContainer;
var offsetDiff;
var containerDiff;
var translate;
var translateX;
var translateY;
var currentVisClass;
var nextVisClass;
// Get target index.
if (typeof position === 'number') {
targetIndex = normalizeArrayIndex(targetItems, position, 1);
} else {
targetItem = targetGrid.getItem(position);
if (!targetItem) return;
targetIndex = targetItems.indexOf(targetItem);
}
// Get current translateX and translateY values if needed.
if (item.isPositioning() || this._isActive || item.isReleasing()) {
translate = getTranslate(element);
translateX = translate.x;
translateY = translate.y;
}
// Abort current positioning.
if (item.isPositioning()) {
item._layout.stop(true, translateX, translateY);
}
// Abort current migration.
if (this._isActive) {
translateX -= this._containerDiffX;
translateY -= this._containerDiffY;
this.stop(true, translateX, translateY);
}
// Abort current release.
if (item.isReleasing()) {
translateX -= item._dragRelease._containerDiffX;
translateY -= item._dragRelease._containerDiffY;
item._dragRelease.stop(true, translateX, translateY);
}
// Stop current visibility animation.
item._visibility.stop(true);
// Destroy current drag.
if (item._drag) item._drag.destroy();
// Emit beforeSend event.
if (grid._hasListeners(EVENT_BEFORE_SEND)) {
grid._emit(EVENT_BEFORE_SEND, {
item: item,
fromGrid: grid,
fromIndex: currentIndex,
toGrid: targetGrid,
toIndex: targetIndex,
});
}
// Emit beforeReceive event.
if (targetGrid._hasListeners(EVENT_BEFORE_RECEIVE)) {
targetGrid._emit(EVENT_BEFORE_RECEIVE, {
item: item,
fromGrid: grid,
fromIndex: currentIndex,
toGrid: targetGrid,
toIndex: targetIndex,
});
}
// Update item class.
if (settings.itemClass !== targetSettings.itemClass) {
removeClass(element, settings.itemClass);
addClass(element, targetSettings.itemClass);
}
// Update visibility class.
currentVisClass = isVisible ? settings.itemVisibleClass : settings.itemHiddenClass;
nextVisClass = isVisible ? targetSettings.itemVisibleClass : targetSettings.itemHiddenClass;
if (currentVisClass !== nextVisClass) {
removeClass(element, currentVisClass);
addClass(element, nextVisClass);
}
// Move item instance from current grid to target grid.
grid._items.splice(currentIndex, 1);
arrayInsert(targetItems, item, targetIndex);
// Update item's grid id reference.
item._gridId = targetGrid._id;
// If item is active we need to move the item inside the target container for
// the duration of the (potential) animation if it's different than the
// current container.
if (isActive) {
currentContainer = element.parentNode;
if (targetContainer !== currentContainer) {
targetContainer.appendChild(element);
offsetDiff = getOffsetDiff(targetContainer, currentContainer, true);
if (!translate) {
translate = getTranslate(element);
translateX = translate.x;
translateY = translate.y;
}
item._setTranslate(translateX + offsetDiff.left, translateY + offsetDiff.top);
}
}
// If item is not active let's just append it to the target grid's element.
else {
targetElement.appendChild(element);
}
// Update child element's styles to reflect the current visibility state.
item._visibility.setStyles(
isVisible ? targetSettings.visibleStyles : targetSettings.hiddenStyles
);
// Get offset diff for the migration data, if the item is active.
if (isActive) {
containerDiff = getOffsetDiff(targetContainer, targetElement, true);
}
// Update item's cached dimensions.
item._refreshDimensions();
// Reset item's sort data.
item._sortData = null;
// Create new drag handler.
item._drag = targetSettings.dragEnabled ? new ItemDrag(item) : null;
// Setup migration data.
if (isActive) {
this._isActive = true;
this._container = targetContainer;
this._containerDiffX = containerDiff.left;
this._containerDiffY = containerDiff.top;
} else {
this._isActive = false;
this._container = null;
this._containerDiffX = 0;
this._containerDiffY = 0;
}
// Emit send event.
if (grid._hasListeners(EVENT_SEND)) {
grid._emit(EVENT_SEND, {
item: item,
fromGrid: grid,
fromIndex: currentIndex,
toGrid: targetGrid,
toIndex: targetIndex,
});
}
// Emit receive event.
if (targetGrid._hasListeners(EVENT_RECEIVE)) {
targetGrid._emit(EVENT_RECEIVE, {
item: item,
fromGrid: grid,
fromIndex: currentIndex,
toGrid: targetGrid,
toIndex: targetIndex,
});
}
};
/**
* End the migrate process of an item. This method can be used to abort an
* ongoing migrate process (animation) or finish the migrate process.
*
* @public
* @param {Boolean} [abort=false]
* - Should the migration be aborted?
* @param {Number} [left]
* - The element's current translateX value (optional).
* @param {Number} [top]
* - The element's current translateY value (optional).
*/
ItemMigrate.prototype.stop = function (abort, left, top) {
if (this._isDestroyed || !this._isActive) return;
var item = this._item;
var element = item._element;
var grid = item.getGrid();
var gridElement = grid._element;
var translate;
if (this._container !== gridElement) {
if (left === undefined || top === undefined) {
if (abort) {
translate = getTranslate(element);
left = translate.x - this._containerDiffX;
top = translate.y - this._containerDiffY;
} else {
left = item._left;
top = item._top;
}
}
gridElement.appendChild(element);
item._setTranslate(left, top);
}
this._isActive = false;
this._container = null;
this._containerDiffX = 0;
this._containerDiffY = 0;
};
/**
* Destroy instance.
*
* @public
*/
ItemMigrate.prototype.destroy = function () {
if (this._isDestroyed) return;
this.stop(true);
this._item = null;
this._isDestroyed = true;
};
/**
* Visibility manager for Item instance, handles visibility of an item.
*
* @class
* @param {Item} item
*/
function ItemVisibility(item) {
var isActive = item._isActive;
var element = item._element;
var childElement = element.children[0];
var settings = item.getGrid()._settings;
if (!childElement) {
throw new Error('No valid child element found within item element.');
}
this._item = item;
this._isDestroyed = false;
this._isHidden = !isActive;
this._isHiding = false;
this._isShowing = false;
this._childElement = childElement;
this._currentStyleProps = [];
this._animation = new Animator(childElement);
this._queue = 'visibility-' + item._id;
this._finishShow = this._finishShow.bind(this);
this._finishHide = this._finishHide.bind(this);
element.style.display = isActive ? '' : 'none';
addClass(element, isActive ? settings.itemVisibleClass : settings.itemHiddenClass);
this.setStyles(isActive ? settings.visibleStyles : settings.hiddenStyles);
}
/**
* Public prototype methods
* ************************
*/
/**
* Show item.
*
* @public
* @param {Boolean} instant
* @param {Function} [onFinish]
*/
ItemVisibility.prototype.show = function (instant, onFinish) {
if (this._isDestroyed) return;
var item = this._item;
var element = item._element;
var callback = isFunction(onFinish) ? onFinish : null;
var grid = item.getGrid();
var settings = grid._settings;
// If item is visible call the callback and be done with it.
if (!this._isShowing && !this._isHidden) {
callback && callback(false, item);
return;
}
// If item is showing and does not need to be shown instantly, let's just
// push callback to the callback queue and be done with it.
if (this._isShowing && !instant) {
callback && item._emitter.on(this._queue, callback);
return;
}
// If the item is hiding or hidden process the current visibility callback
// queue with the interrupted flag active, update classes and set display
// to block if necessary.
if (!this._isShowing) {
item._emitter.burst(this._queue, true, item);
removeClass(element, settings.itemHiddenClass);
addClass(element, settings.itemVisibleClass);
if (!this._isHiding) element.style.display = '';
}
// Push callback to the callback queue.
callback && item._emitter.on(this._queue, callback);
// Update visibility states.
this._isShowing = true;
this._isHiding = this._isHidden = false;
// Finally let's start show animation.
this._startAnimation(true, instant, this._finishShow);
};
/**
* Hide item.
*
* @public
* @param {Boolean} instant
* @param {Function} [onFinish]
*/
ItemVisibility.prototype.hide = function (instant, onFinish) {
if (this._isDestroyed) return;
var item = this._item;
var element = item._element;
var callback = isFunction(onFinish) ? onFinish : null;
var grid = item.getGrid();
var settings = grid._settings;
// If item is already hidden call the callback and be done with it.
if (!this._isHiding && this._isHidden) {
callback && callback(false, item);
return;
}
// If item is hiding and does not need to be hidden instantly, let's just
// push callback to the callback queue and be done with it.
if (this._isHiding && !instant) {
callback && item._emitter.on(this._queue, callback);
return;
}
// If the item is showing or visible process the current visibility callback
// queue with the interrupted flag active, update classes and set display
// to block if necessary.
if (!this._isHiding) {
item._emitter.burst(this._queue, true, item);
addClass(element, settings.itemHiddenClass);
removeClass(element, settings.itemVisibleClass);
}
// Push callback to the callback queue.
callback && item._emitter.on(this._queue, callback);
// Update visibility states.
this._isHidden = this._isHiding = true;
this._isShowing = false;
// Finally let's start hide animation.
this._startAnimation(false, instant, this._finishHide);
};
/**
* Stop current hiding/showing process.
*
* @public
* @param {Boolean} processCallbackQueue
*/
ItemVisibility.prototype.stop = function (processCallbackQueue) {
if (this._isDestroyed) return;
if (!this._isHiding && !this._isShowing) return;
var item = this._item;
cancelVisibilityTick(item._id);
this._animation.stop();
if (processCallbackQueue) {
item._emitter.burst(this._queue, true, item);
}
};
/**
* Reset all existing visibility styles and apply new visibility styles to the
* visibility element. This method should be used to set styles when there is a
* chance that the current style properties differ from the new ones (basically
* on init and on migrations).
*
* @public
* @param {Object} styles
*/
ItemVisibility.prototype.setStyles = function (styles) {
var childElement = this._childElement;
var currentStyleProps = this._currentStyleProps;
this._removeCurrentStyles();
for (var prop in styles) {
currentStyleProps.push(prop);
childElement.style[prop] = styles[prop];
}
};
/**
* Destroy the instance and stop current animation if it is running.
*
* @public
*/
ItemVisibility.prototype.destroy = function () {
if (this._isDestroyed) return;
var item = this._item;
var element = item._element;
var grid = item.getGrid();
var settings = grid._settings;
this.stop(true);
item._emitter.clear(this._queue);
this._animation.destroy();
this._removeCurrentStyles();
removeClass(element, settings.itemVisibleClass);
removeClass(element, settings.itemHiddenClass);
element.style.display = '';
// Reset state.
this._isHiding = this._isShowing = false;
this._isDestroyed = this._isHidden = true;
};
/**
* Private prototype methods
* *************************
*/
/**
* Start visibility animation.
*
* @private
* @param {Boolean} toVisible
* @param {Boolean} [instant]
* @param {Function} [onFinish]
*/
ItemVisibility.prototype._startAnimation = function (toVisible, instant, onFinish) {
if (this._isDestroyed) return;
var item = this._item;
var animation = this._animation;
var childElement = this._childElement;
var settings = item.getGrid()._settings;
var targetStyles = toVisible ? settings.visibleStyles : settings.hiddenStyles;
var duration = toVisible ? settings.showDuration : settings.hideDuration;
var easing = toVisible ? settings.showEasing : settings.hideEasing;
var isInstant = instant || duration <= 0;
var currentStyles;
// No target styles? Let's quit early.
if (!targetStyles) {
onFinish && onFinish();
return;
}
// Cancel queued visibility tick.
cancelVisibilityTick(item._id);
// If we need to apply the styles instantly without animation.
if (isInstant) {
setStyles(childElement, targetStyles);
animation.stop();
onFinish && onFinish();
return;
}
// Start the animation in the next tick (to avoid layout thrashing).
addVisibilityTick(
item._id,
function () {
currentStyles = getCurrentStyles(childElement, targetStyles);
},
function () {
animation.start(currentStyles, targetStyles, {
duration: duration,
easing: easing,
onFinish: onFinish,
});
}
);
};
/**
* Finish show procedure.
*
* @private
*/
ItemVisibility.prototype._finishShow = function () {
if (this._isHidden) return;
this._isShowing = false;
this._item._emitter.burst(this._queue, false, this._item);
};
/**
* Finish hide procedure.
*
* @private
*/
ItemVisibility.prototype._finishHide = function () {
if (!this._isHidden) return;
var item = this._item;
this._isHiding = false;
item._layout.stop(true, 0, 0);
item._element.style.display = 'none';
item._emitter.burst(this._queue, false, item);
};
/**
* Remove currently applied visibility related inline style properties.
*
* @private
*/
ItemVisibility.prototype._removeCurrentStyles = function () {
var childElement = this._childElement;
var currentStyleProps = this._currentStyleProps;
for (var i = 0; i < currentStyleProps.length; i++) {
childElement.style[currentStyleProps[i]] = '';
}
currentStyleProps.length = 0;
};
var id = 0;
/**
* Returns a unique numeric id (increments a base value on every call).
* @returns {Number}
*/
function createUid() {
return ++id;
}
/**
* Creates a new Item instance for a Grid instance.
*
* @class
* @param {Grid} grid
* @param {HTMLElement} element
* @param {Boolean} [isActive]
*/
function Item(grid, element, isActive) {
var settings = grid._settings;
// Store item/element pair to a map (for faster item querying by element).
if (ITEM_ELEMENT_MAP) {
if (ITEM_ELEMENT_MAP.has(element)) {
throw new Error('You can only create one Muuri Item per element!');
} else {
ITEM_ELEMENT_MAP.set(element, this);
}
}
this._id = createUid();
this._gridId = grid._id;
this._element = element;
this._isDestroyed = false;
this._left = 0;
this._top = 0;
this._width = 0;
this._height = 0;
this._marginLeft = 0;
this._marginRight = 0;
this._marginTop = 0;
this._marginBottom = 0;
this._tX = undefined;
this._tY = undefined;
this._sortData = null;
this._emitter = new Emitter();
// If the provided item element is not a direct child of the grid container
// element, append it to the grid container. Note, we are indeed reading the
// DOM here but it's a property that does not cause reflowing.
if (element.parentNode !== grid._element) {
grid._element.appendChild(element);
}
// Set item class.
addClass(element, settings.itemClass);
// If isActive is not defined, let's try to auto-detect it. Note, we are
// indeed reading the DOM here but it's a property that does not cause
// reflowing.
if (typeof isActive !== 'boolean') {
isActive = getStyle(element, 'display') !== 'none';
}
// Set up active state (defines if the item is considered part of the layout
// or not).
this._isActive = isActive;
// Setup visibility handler.
this._visibility = new ItemVisibility(this);
// Set up layout handler.
this._layout = new ItemLayout(this);
// Set up migration handler data.
this._migrate = new ItemMigrate(this);
// Set up drag handler.
this._drag = settings.dragEnabled ? new ItemDrag(this) : null;
// Set up release handler. Note that although this is fully linked to dragging
// this still needs to be always instantiated to handle migration scenarios
// correctly.
this._dragRelease = new ItemDragRelease(this);
// Set up drag placeholder handler. Note that although this is fully linked to
// dragging this still needs to be always instantiated to handle migration
// scenarios correctly.
this._dragPlaceholder = new ItemDragPlaceholder(this);
// Note! You must call the following methods before you start using the
// instance. They are deliberately not called in the end as it would cause
// potentially a massive amount of reflows if multiple items were instantiated
// in a loop.
// this._refreshDimensions();
// this._refreshSortData();
}
/**
* Public prototype methods
* ************************
*/
/**
* Get the instance grid reference.
*
* @public
* @returns {Grid}
*/
Item.prototype.getGrid = function () {
return GRID_INSTANCES[this._gridId];
};
/**
* Get the instance element.
*
* @public
* @returns {HTMLElement}
*/
Item.prototype.getElement = function () {
return this._element;
};
/**
* Get instance element's cached width.
*
* @public
* @returns {Number}
*/
Item.prototype.getWidth = function () {
return this._width;
};
/**
* Get instance element's cached height.
*
* @public
* @returns {Number}
*/
Item.prototype.getHeight = function () {
return this._height;
};
/**
* Get instance element's cached margins.
*
* @public
* @returns {Object}
* - The returned object contains left, right, top and bottom properties
* which indicate the item element's cached margins.
*/
Item.prototype.getMargin = function () {
return {
left: this._marginLeft,
right: this._marginRight,
top: this._marginTop,
bottom: this._marginBottom,
};
};
/**
* Get instance element's cached position.
*
* @public
* @returns {Object}
* - The returned object contains left and top properties which indicate the
* item element's cached position in the grid.
*/
Item.prototype.getPosition = function () {
return {
left: this._left,
top: this._top,
};
};
/**
* Is the item active?
*
* @public
* @returns {Boolean}
*/
Item.prototype.isActive = function () {
return this._isActive;
};
/**
* Is the item visible?
*
* @public
* @returns {Boolean}
*/
Item.prototype.isVisible = function () {
return !!this._visibility && !this._visibility._isHidden;
};
/**
* Is the item being animated to visible?
*
* @public
* @returns {Boolean}
*/
Item.prototype.isShowing = function () {
return !!(this._visibility && this._visibility._isShowing);
};
/**
* Is the item being animated to hidden?
*
* @public
* @returns {Boolean}
*/
Item.prototype.isHiding = function () {
return !!(this._visibility && this._visibility._isHiding);
};
/**
* Is the item positioning?
*
* @public
* @returns {Boolean}
*/
Item.prototype.isPositioning = function () {
return !!(this._layout && this._layout._isActive);
};
/**
* Is the item being dragged (or queued for dragging)?
*
* @public
* @returns {Boolean}
*/
Item.prototype.isDragging = function () {
return !!(this._drag && this._drag._isActive);
};
/**
* Is the item being released?
*
* @public
* @returns {Boolean}
*/
Item.prototype.isReleasing = function () {
return !!(this._dragRelease && this._dragRelease._isActive);
};
/**
* Is the item destroyed?
*
* @public
* @returns {Boolean}
*/
Item.prototype.isDestroyed = function () {
return this._isDestroyed;
};
/**
* Private prototype methods
* *************************
*/
/**
* Recalculate item's dimensions.
*
* @private
* @param {Boolean} [force=false]
*/
Item.prototype._refreshDimensions = function (force) {
if (this._isDestroyed) return;
if (force !== true && this._visibility._isHidden) return;
var element = this._element;
var dragPlaceholder = this._dragPlaceholder;
var rect = element.getBoundingClientRect();
// Calculate width and height.
this._width = rect.width;
this._height = rect.height;
// Calculate margins (ignore negative margins).
this._marginLeft = Math.max(0, getStyleAsFloat(element, 'margin-left'));
this._marginRight = Math.max(0, getStyleAsFloat(element, 'margin-right'));
this._marginTop = Math.max(0, getStyleAsFloat(element, 'margin-top'));
this._marginBottom = Math.max(0, getStyleAsFloat(element, 'margin-bottom'));
// Keep drag placeholder's dimensions synced with the item's.
if (dragPlaceholder) dragPlaceholder.updateDimensions();
};
/**
* Fetch and store item's sort data.
*
* @private
*/
Item.prototype._refreshSortData = function () {
if (this._isDestroyed) return;
var data = (this._sortData = {});
var getters = this.getGrid()._settings.sortData;
var prop;
for (prop in getters) {
data[prop] = getters[prop](this, this._element);
}
};
/**
* Add item to layout.
*
* @private
*/
Item.prototype._addToLayout = function (left, top) {
if (this._isActive === true) return;
this._isActive = true;
this._left = left || 0;
this._top = top || 0;
};
/**
* Remove item from layout.
*
* @private
*/
Item.prototype._removeFromLayout = function () {
if (this._isActive === false) return;
this._isActive = false;
this._left = 0;
this._top = 0;
};
/**
* Check if the layout procedure can be skipped for the item.
*
* @private
* @param {Number} left
* @param {Number} top
* @returns {Boolean}
*/
Item.prototype._canSkipLayout = function (left, top) {
return (
this._left === left &&
this._top === top &&
!this._migrate._isActive &&
!this._layout._skipNextAnimation &&
!this._dragRelease.isJustReleased()
);
};
/**
* Set the provided left and top arguments as the item element's translate
* values in the DOM. This method keeps track of the currently applied
* translate values and skips the update operation if the provided values are
* identical to the currently applied values. Returns `false` if there was no
* need for update and `true` if the translate value was updated.
*
* @private
* @param {Number} left
* @param {Number} top
* @returns {Boolean}
*/
Item.prototype._setTranslate = function (left, top) {
if (this._tX === left && this._tY === top) return false;
this._tX = left;
this._tY = top;
this._element.style[transformProp] = getTranslateString(left, top);
return true;
};
/**
* Destroy item instance.
*
* @private
* @param {Boolean} [removeElement=false]
*/
Item.prototype._destroy = function (removeElement) {
if (this._isDestroyed) return;
var element = this._element;
var grid = this.getGrid();
var settings = grid._settings;
// Destroy handlers.
this._dragPlaceholder.destroy();
this._dragRelease.destroy();
this._migrate.destroy();
this._layout.destroy();
this._visibility.destroy();
if (this._drag) this._drag.destroy();
// Destroy emitter.
this._emitter.destroy();
// Remove item class.
removeClass(element, settings.itemClass);
// Remove element from DOM.
if (removeElement) element.parentNode.removeChild(element);
// Remove item/element pair from map.
if (ITEM_ELEMENT_MAP) ITEM_ELEMENT_MAP.delete(element);
// Reset state.
this._isActive = false;
this._isDestroyed = true;
};
function createPackerProcessor(isWorker) {
var FILL_GAPS = 1;
var HORIZONTAL = 2;
var ALIGN_RIGHT = 4;
var ALIGN_BOTTOM = 8;
var ROUNDING = 16;
var EPS = 0.001;
var MIN_SLOT_SIZE = 0.5;
// Rounds number first to three decimal precision and then floors the result
// to two decimal precision.
// Math.floor(Math.round(number * 1000) / 10) / 100
function roundNumber(number) {
return ((((number * 1000 + 0.5) << 0) / 10) << 0) / 100;
}
/**
* @class
*/
function PackerProcessor() {
this.currentRects = [];
this.nextRects = [];
this.rectTarget = {};
this.rectStore = [];
this.slotSizes = [];
this.rectId = 0;
this.slotIndex = -1;
this.slotData = { left: 0, top: 0, width: 0, height: 0 };
this.sortRectsLeftTop = this.sortRectsLeftTop.bind(this);
this.sortRectsTopLeft = this.sortRectsTopLeft.bind(this);
}
/**
* Takes a layout object as an argument and computes positions (slots) for the
* layout items. Also computes the final width and height of the layout. The
* provided layout object's slots array is mutated as well as the width and
* height properties.
*
* @param {Object} layout
* @param {Number} layout.width
* - The start (current) width of the layout in pixels.
* @param {Number} layout.height
* - The start (current) height of the layout in pixels.
* @param {(Item[]|Number[])} layout.items
* - List of Muuri.Item instances or a list of item dimensions
* (e.g [ item1Width, item1Height, item2Width, item2Height, ... ]).
* @param {(Array|Float32Array)} layout.slots
* - An Array/Float32Array instance which's length should equal to
* the amount of items times two. The position (width and height) of each
* item will be written into this array.
* @param {Number} settings
* - The layout's settings as bitmasks.
* @returns {Object}
*/
PackerProcessor.prototype.computeLayout = function (layout, settings) {
var items = layout.items;
var slots = layout.slots;
var fillGaps = !!(settings & FILL_GAPS);
var horizontal = !!(settings & HORIZONTAL);
var alignRight = !!(settings & ALIGN_RIGHT);
var alignBottom = !!(settings & ALIGN_BOTTOM);
var rounding = !!(settings & ROUNDING);
var isPreProcessed = typeof items[0] === 'number';
var i, bump, item, slotWidth, slotHeight, slot;
// No need to go further if items do not exist.
if (!items.length) return layout;
// Compute slots for the items.
bump = isPreProcessed ? 2 : 1;
for (i = 0; i < items.length; i += bump) {
// If items are pre-processed it means that items array contains only
// the raw dimensions of the items. Otherwise we assume it is an array
// of normal Muuri items.
if (isPreProcessed) {
slotWidth = items[i];
slotHeight = items[i + 1];
} else {
item = items[i];
slotWidth = item._width + item._marginLeft + item._marginRight;
slotHeight = item._height + item._marginTop + item._marginBottom;
}
// If rounding is enabled let's round the item's width and height to
// make the layout algorithm a bit more stable. This has a performance
// cost so don't use this if not necessary.
if (rounding) {
slotWidth = roundNumber(slotWidth);
slotHeight = roundNumber(slotHeight);
}
// Get slot data.
slot = this.computeNextSlot(layout, slotWidth, slotHeight, fillGaps, horizontal);
// Update layout width/height.
if (horizontal) {
if (slot.left + slot.width > layout.width) {
layout.width = slot.left + slot.width;
}
} else {
if (slot.top + slot.height > layout.height) {
layout.height = slot.top + slot.height;
}
}
// Add item slot data to layout slots.
slots[++this.slotIndex] = slot.left;
slots[++this.slotIndex] = slot.top;
// Store the size too (for later usage) if needed.
if (alignRight || alignBottom) {
this.slotSizes.push(slot.width, slot.height);
}
}
// If the alignment is set to right we need to adjust the results.
if (alignRight) {
for (i = 0; i < slots.length; i += 2) {
slots[i] = layout.width - (slots[i] + this.slotSizes[i]);
}
}
// If the alignment is set to bottom we need to adjust the results.
if (alignBottom) {
for (i = 1; i < slots.length; i += 2) {
slots[i] = layout.height - (slots[i] + this.slotSizes[i]);
}
}
// Reset stuff.
this.slotSizes.length = 0;
this.currentRects.length = 0;
this.nextRects.length = 0;
this.rectId = 0;
this.slotIndex = -1;
return layout;
};
/**
* Calculate next slot in the layout. Returns a slot object with position and
* dimensions data. The returned object is reused between calls.
*
* @param {Object} layout
* @param {Number} slotWidth
* @param {Number} slotHeight
* @param {Boolean} fillGaps
* @param {Boolean} horizontal
* @returns {Object}
*/
PackerProcessor.prototype.computeNextSlot = function (
layout,
slotWidth,
slotHeight,
fillGaps,
horizontal
) {
var slot = this.slotData;
var currentRects = this.currentRects;
var nextRects = this.nextRects;
var ignoreCurrentRects = false;
var rect;
var rectId;
var shards;
var i;
var j;
// Reset new slots.
nextRects.length = 0;
// Set item slot initial data.
slot.left = null;
slot.top = null;
slot.width = slotWidth;
slot.height = slotHeight;
// Try to find position for the slot from the existing free spaces in the
// layout.
for (i = 0; i < currentRects.length; i++) {
rectId = currentRects[i];
if (!rectId) continue;
rect = this.getRect(rectId);
if (slot.width <= rect.width + EPS && slot.height <= rect.height + EPS) {
slot.left = rect.left;
slot.top = rect.top;
break;
}
}
// If no position was found for the slot let's position the slot to
// the bottom left (in vertical mode) or top right (in horizontal mode) of
// the layout.
if (slot.left === null) {
if (horizontal) {
slot.left = layout.width;
slot.top = 0;
} else {
slot.left = 0;
slot.top = layout.height;
}
// If gaps don't need filling let's throw away all the current free spaces
// (currentRects).
if (!fillGaps) {
ignoreCurrentRects = true;
}
}
// In vertical mode, if the slot's bottom overlaps the layout's bottom.
if (!horizontal && slot.top + slot.height > layout.height + EPS) {
// If slot is not aligned to the left edge, create a new free space to the
// left of the slot.
if (slot.left > MIN_SLOT_SIZE) {
nextRects.push(this.addRect(0, layout.height, slot.left, Infinity));
}
// If slot is not aligned to the right edge, create a new free space to
// the right of the slot.
if (slot.left + slot.width < layout.width - MIN_SLOT_SIZE) {
nextRects.push(
this.addRect(
slot.left + slot.width,
layout.height,
layout.width - slot.left - slot.width,
Infinity
)
);
}
// Update layout height.
layout.height = slot.top + slot.height;
}
// In horizontal mode, if the slot's right overlaps the layout's right edge.
if (horizontal && slot.left + slot.width > layout.width + EPS) {
// If slot is not aligned to the top, create a new free space above the
// slot.
if (slot.top > MIN_SLOT_SIZE) {
nextRects.push(this.addRect(layout.width, 0, Infinity, slot.top));
}
// If slot is not aligned to the bottom, create a new free space below
// the slot.
if (slot.top + slot.height < layout.height - MIN_SLOT_SIZE) {
nextRects.push(
this.addRect(
layout.width,
slot.top + slot.height,
Infinity,
layout.height - slot.top - slot.height
)
);
}
// Update layout width.
layout.width = slot.left + slot.width;
}
// Clean up the current free spaces making sure none of them overlap with
// the slot. Split all overlapping free spaces into smaller shards that do
// not overlap with the slot.
if (!ignoreCurrentRects) {
if (fillGaps) i = 0;
for (; i < currentRects.length; i++) {
rectId = currentRects[i];
if (!rectId) continue;
rect = this.getRect(rectId);
shards = this.splitRect(rect, slot);
for (j = 0; j < shards.length; j++) {
rectId = shards[j];
rect = this.getRect(rectId);
// Make sure that the free space is within the boundaries of the
// layout. This routine is critical to the algorithm as it makes sure
// that there are no leftover spaces with infinite height/width.
// It's also essential that we don't compare values absolutely to each
// other but leave a little headroom (EPSILON) to get rid of false
// positives.
if (
horizontal ? rect.left + EPS < layout.width - EPS : rect.top + EPS < layout.height - EPS
) {
nextRects.push(rectId);
}
}
}
}
// Sanitize and sort all the new free spaces that will be used in the next
// iteration. This procedure is critical to make the bin-packing algorithm
// work. The free spaces have to be in correct order in the beginning of the
// next iteration.
if (nextRects.length > 1) {
this.purgeRects(nextRects).sort(horizontal ? this.sortRectsLeftTop : this.sortRectsTopLeft);
}
// Finally we need to make sure that `this.currentRects` points to
// `nextRects` array as that is used in the next iteration's beginning when
// we try to find a space for the next slot.
this.currentRects = nextRects;
this.nextRects = currentRects;
return slot;
};
/**
* Add a new rectangle to the rectangle store. Returns the id of the new
* rectangle.
*
* @param {Number} left
* @param {Number} top
* @param {Number} width
* @param {Number} height
* @returns {Number}
*/
PackerProcessor.prototype.addRect = function (left, top, width, height) {
var rectId = ++this.rectId;
this.rectStore[rectId] = left || 0;
this.rectStore[++this.rectId] = top || 0;
this.rectStore[++this.rectId] = width || 0;
this.rectStore[++this.rectId] = height || 0;
return rectId;
};
/**
* Get rectangle data from the rectangle store by id. Optionally you can
* provide a target object where the rectangle data will be written in. By
* default an internal object is reused as a target object.
*
* @param {Number} id
* @param {Object} [target]
* @returns {Object}
*/
PackerProcessor.prototype.getRect = function (id, target) {
if (!target) target = this.rectTarget;
target.left = this.rectStore[id] || 0;
target.top = this.rectStore[++id] || 0;
target.width = this.rectStore[++id] || 0;
target.height = this.rectStore[++id] || 0;
return target;
};
/**
* Punch a hole into a rectangle and return the shards (1-4).
*
* @param {Object} rect
* @param {Object} hole
* @returns {Number[]}
*/
PackerProcessor.prototype.splitRect = (function () {
var shards = [];
var width = 0;
var height = 0;
return function (rect, hole) {
// Reset old shards.
shards.length = 0;
// If the slot does not overlap with the hole add slot to the return data
// as is. Note that in this case we are eager to keep the slot as is if
// possible so we use the EPSILON in favour of that logic.
if (
rect.left + rect.width <= hole.left + EPS ||
hole.left + hole.width <= rect.left + EPS ||
rect.top + rect.height <= hole.top + EPS ||
hole.top + hole.height <= rect.top + EPS
) {
shards.push(this.addRect(rect.left, rect.top, rect.width, rect.height));
return shards;
}
// Left split.
width = hole.left - rect.left;
if (width >= MIN_SLOT_SIZE) {
shards.push(this.addRect(rect.left, rect.top, width, rect.height));
}
// Right split.
width = rect.left + rect.width - (hole.left + hole.width);
if (width >= MIN_SLOT_SIZE) {
shards.push(this.addRect(hole.left + hole.width, rect.top, width, rect.height));
}
// Top split.
height = hole.top - rect.top;
if (height >= MIN_SLOT_SIZE) {
shards.push(this.addRect(rect.left, rect.top, rect.width, height));
}
// Bottom split.
height = rect.top + rect.height - (hole.top + hole.height);
if (height >= MIN_SLOT_SIZE) {
shards.push(this.addRect(rect.left, hole.top + hole.height, rect.width, height));
}
return shards;
};
})();
/**
* Check if a rectangle is fully within another rectangle.
*
* @param {Object} a
* @param {Object} b
* @returns {Boolean}
*/
PackerProcessor.prototype.isRectAWithinRectB = function (a, b) {
return (
a.left + EPS >= b.left &&
a.top + EPS >= b.top &&
a.left + a.width - EPS <= b.left + b.width &&
a.top + a.height - EPS <= b.top + b.height
);
};
/**
* Loops through an array of rectangle ids and resets all that are fully
* within another rectangle in the array. Resetting in this case means that
* the rectangle id value is replaced with zero.
*
* @param {Number[]} rectIds
* @returns {Number[]}
*/
PackerProcessor.prototype.purgeRects = (function () {
var rectA = {};
var rectB = {};
return function (rectIds) {
var i = rectIds.length;
var j;
while (i--) {
j = rectIds.length;
if (!rectIds[i]) continue;
this.getRect(rectIds[i], rectA);
while (j--) {
if (!rectIds[j] || i === j) continue;
this.getRect(rectIds[j], rectB);
if (this.isRectAWithinRectB(rectA, rectB)) {
rectIds[i] = 0;
break;
}
}
}
return rectIds;
};
})();
/**
* Sort rectangles with top-left gravity.
*
* @param {Number} aId
* @param {Number} bId
* @returns {Number}
*/
PackerProcessor.prototype.sortRectsTopLeft = (function () {
var rectA = {};
var rectB = {};
return function (aId, bId) {
this.getRect(aId, rectA);
this.getRect(bId, rectB);
return rectA.top < rectB.top && rectA.top + EPS < rectB.top
? -1
: rectA.top > rectB.top && rectA.top - EPS > rectB.top
? 1
: rectA.left < rectB.left && rectA.left + EPS < rectB.left
? -1
: rectA.left > rectB.left && rectA.left - EPS > rectB.left
? 1
: 0;
};
})();
/**
* Sort rectangles with left-top gravity.
*
* @param {Number} aId
* @param {Number} bId
* @returns {Number}
*/
PackerProcessor.prototype.sortRectsLeftTop = (function () {
var rectA = {};
var rectB = {};
return function (aId, bId) {
this.getRect(aId, rectA);
this.getRect(bId, rectB);
return rectA.left < rectB.left && rectA.left + EPS < rectB.left
? -1
: rectA.left > rectB.left && rectA.left - EPS < rectB.left
? 1
: rectA.top < rectB.top && rectA.top + EPS < rectB.top
? -1
: rectA.top > rectB.top && rectA.top - EPS > rectB.top
? 1
: 0;
};
})();
if (isWorker) {
var PACKET_INDEX_WIDTH = 1;
var PACKET_INDEX_HEIGHT = 2;
var PACKET_INDEX_OPTIONS = 3;
var PACKET_HEADER_SLOTS = 4;
var processor = new PackerProcessor();
self.onmessage = function (msg) {
var data = new Float32Array(msg.data);
var items = data.subarray(PACKET_HEADER_SLOTS, data.length);
var slots = new Float32Array(items.length);
var settings = data[PACKET_INDEX_OPTIONS];
var layout = {
items: items,
slots: slots,
width: data[PACKET_INDEX_WIDTH],
height: data[PACKET_INDEX_HEIGHT],
};
// Compute the layout (width / height / slots).
processor.computeLayout(layout, settings);
// Copy layout data to the return data.
data[PACKET_INDEX_WIDTH] = layout.width;
data[PACKET_INDEX_HEIGHT] = layout.height;
data.set(layout.slots, PACKET_HEADER_SLOTS);
// Send layout back to the main thread.
postMessage(data.buffer, [data.buffer]);
};
}
return PackerProcessor;
}
var PackerProcessor = createPackerProcessor();
//
// WORKER UTILS
//
var blobUrl = null;
var activeWorkers = [];
function createWorkerProcessors(amount, onmessage) {
var workers = [];
if (amount > 0) {
if (!blobUrl) {
blobUrl = URL.createObjectURL(
new Blob(['(' + createPackerProcessor.toString() + ')(true)'], {
type: 'application/javascript',
})
);
}
for (var i = 0, worker; i < amount; i++) {
worker = new Worker(blobUrl);
if (onmessage) worker.onmessage = onmessage;
workers.push(worker);
activeWorkers.push(worker);
}
}
return workers;
}
function destroyWorkerProcessors(workers) {
var worker;
var index;
for (var i = 0; i < workers.length; i++) {
worker = workers[i];
worker.onmessage = null;
worker.onerror = null;
worker.onmessageerror = null;
worker.terminate();
index = activeWorkers.indexOf(worker);
if (index > -1) activeWorkers.splice(index, 1);
}
if (blobUrl && !activeWorkers.length) {
URL.revokeObjectURL(blobUrl);
blobUrl = null;
}
}
function isWorkerProcessorsSupported() {
return !!(window.Worker && window.URL && window.Blob);
}
var FILL_GAPS = 1;
var HORIZONTAL = 2;
var ALIGN_RIGHT = 4;
var ALIGN_BOTTOM = 8;
var ROUNDING = 16;
var PACKET_INDEX_ID = 0;
var PACKET_INDEX_WIDTH = 1;
var PACKET_INDEX_HEIGHT = 2;
var PACKET_INDEX_OPTIONS = 3;
var PACKET_HEADER_SLOTS = 4;
/**
* @class
* @param {Number} [numWorkers=0]
* @param {Object} [options]
* @param {Boolean} [options.fillGaps=false]
* @param {Boolean} [options.horizontal=false]
* @param {Boolean} [options.alignRight=false]
* @param {Boolean} [options.alignBottom=false]
* @param {Boolean} [options.rounding=false]
*/
function Packer(numWorkers, options) {
this._options = 0;
this._processor = null;
this._layoutQueue = [];
this._layouts = {};
this._layoutCallbacks = {};
this._layoutWorkers = {};
this._layoutWorkerData = {};
this._workers = [];
this._onWorkerMessage = this._onWorkerMessage.bind(this);
// Set initial options.
this.setOptions(options);
// Init the worker(s) or the processor if workers can't be used.
numWorkers = typeof numWorkers === 'number' ? Math.max(0, numWorkers) : 0;
if (numWorkers && isWorkerProcessorsSupported()) {
try {
this._workers = createWorkerProcessors(numWorkers, this._onWorkerMessage);
} catch (e) {
this._processor = new PackerProcessor();
}
} else {
this._processor = new PackerProcessor();
}
}
Packer.prototype._sendToWorker = function () {
if (!this._layoutQueue.length || !this._workers.length) return;
var layoutId = this._layoutQueue.shift();
var worker = this._workers.pop();
var data = this._layoutWorkerData[layoutId];
delete this._layoutWorkerData[layoutId];
this._layoutWorkers[layoutId] = worker;
worker.postMessage(data.buffer, [data.buffer]);
};
Packer.prototype._onWorkerMessage = function (msg) {
var data = new Float32Array(msg.data);
var layoutId = data[PACKET_INDEX_ID];
var layout = this._layouts[layoutId];
var callback = this._layoutCallbacks[layoutId];
var worker = this._layoutWorkers[layoutId];
if (layout) delete this._layoutCallbacks[layoutId];
if (callback) delete this._layoutCallbacks[layoutId];
if (worker) delete this._layoutWorkers[layoutId];
if (layout && callback) {
layout.width = data[PACKET_INDEX_WIDTH];
layout.height = data[PACKET_INDEX_HEIGHT];
layout.slots = data.subarray(PACKET_HEADER_SLOTS, data.length);
this._finalizeLayout(layout);
callback(layout);
}
if (worker) {
this._workers.push(worker);
this._sendToWorker();
}
};
Packer.prototype._finalizeLayout = function (layout) {
var grid = layout._grid;
var isHorizontal = layout._settings & HORIZONTAL;
var isBorderBox = grid._boxSizing === 'border-box';
delete layout._grid;
delete layout._settings;
layout.styles = {};
if (isHorizontal) {
layout.styles.width =
(isBorderBox ? layout.width + grid._borderLeft + grid._borderRight : layout.width) + 'px';
} else {
layout.styles.height =
(isBorderBox ? layout.height + grid._borderTop + grid._borderBottom : layout.height) + 'px';
}
return layout;
};
/**
* @public
* @param {Object} [options]
* @param {Boolean} [options.fillGaps]
* @param {Boolean} [options.horizontal]
* @param {Boolean} [options.alignRight]
* @param {Boolean} [options.alignBottom]
* @param {Boolean} [options.rounding]
*/
Packer.prototype.setOptions = function (options) {
if (!options) return;
var fillGaps;
if (typeof options.fillGaps === 'boolean') {
fillGaps = options.fillGaps ? FILL_GAPS : 0;
} else {
fillGaps = this._options & FILL_GAPS;
}
var horizontal;
if (typeof options.horizontal === 'boolean') {
horizontal = options.horizontal ? HORIZONTAL : 0;
} else {
horizontal = this._options & HORIZONTAL;
}
var alignRight;
if (typeof options.alignRight === 'boolean') {
alignRight = options.alignRight ? ALIGN_RIGHT : 0;
} else {
alignRight = this._options & ALIGN_RIGHT;
}
var alignBottom;
if (typeof options.alignBottom === 'boolean') {
alignBottom = options.alignBottom ? ALIGN_BOTTOM : 0;
} else {
alignBottom = this._options & ALIGN_BOTTOM;
}
var rounding;
if (typeof options.rounding === 'boolean') {
rounding = options.rounding ? ROUNDING : 0;
} else {
rounding = this._options & ROUNDING;
}
this._options = fillGaps | horizontal | alignRight | alignBottom | rounding;
};
/**
* @public
* @param {Grid} grid
* @param {Number} layoutId
* @param {Item[]} items
* @param {Number} width
* @param {Number} height
* @param {Function} callback
* @returns {?Function}
*/
Packer.prototype.createLayout = function (grid, layoutId, items, width, height, callback) {
if (this._layouts[layoutId]) {
throw new Error('A layout with the provided id is currently being processed.');
}
var horizontal = this._options & HORIZONTAL;
var layout = {
id: layoutId,
items: items,
slots: null,
width: horizontal ? 0 : width,
height: !horizontal ? 0 : height,
// Temporary data, which will be removed before sending the layout data
// outside of Packer's context.
_grid: grid,
_settings: this._options,
};
// If there are no items let's call the callback immediately.
if (!items.length) {
layout.slots = [];
this._finalizeLayout(layout);
callback(layout);
return;
}
// Create layout synchronously if needed.
if (this._processor) {
layout.slots = window.Float32Array
? new Float32Array(items.length * 2)
: new Array(items.length * 2);
this._processor.computeLayout(layout, layout._settings);
this._finalizeLayout(layout);
callback(layout);
return;
}
// Worker data.
var data = new Float32Array(PACKET_HEADER_SLOTS + items.length * 2);
// Worker data header.
data[PACKET_INDEX_ID] = layoutId;
data[PACKET_INDEX_WIDTH] = layout.width;
data[PACKET_INDEX_HEIGHT] = layout.height;
data[PACKET_INDEX_OPTIONS] = layout._settings;
// Worker data items.
var i, j, item;
for (i = 0, j = PACKET_HEADER_SLOTS - 1, item; i < items.length; i++) {
item = items[i];
data[++j] = item._width + item._marginLeft + item._marginRight;
data[++j] = item._height + item._marginTop + item._marginBottom;
}
this._layoutQueue.push(layoutId);
this._layouts[layoutId] = layout;
this._layoutCallbacks[layoutId] = callback;
this._layoutWorkerData[layoutId] = data;
this._sendToWorker();
return this.cancelLayout.bind(this, layoutId);
};
/**
* @public
* @param {Number} layoutId
*/
Packer.prototype.cancelLayout = function (layoutId) {
var layout = this._layouts[layoutId];
if (!layout) return;
delete this._layouts[layoutId];
delete this._layoutCallbacks[layoutId];
if (this._layoutWorkerData[layoutId]) {
delete this._layoutWorkerData[layoutId];
var queueIndex = this._layoutQueue.indexOf(layoutId);
if (queueIndex > -1) this._layoutQueue.splice(queueIndex, 1);
}
};
/**
* @public
*/
Packer.prototype.destroy = function () {
// Move all currently used workers back in the workers array.
for (var key in this._layoutWorkers) {
this._workers.push(this._layoutWorkers[key]);
}
// Destroy all instance's workers.
destroyWorkerProcessors(this._workers);
// Reset data.
this._workers.length = 0;
this._layoutQueue.length = 0;
this._layouts = {};
this._layoutCallbacks = {};
this._layoutWorkers = {};
this._layoutWorkerData = {};
};
var debounceId = 0;
/**
* Returns a function, that, as long as it continues to be invoked, will not
* be triggered. The function will be called after it stops being called for
* N milliseconds. The returned function accepts one argument which, when
* being `true`, cancels the debounce function immediately. When the debounce
* function is canceled it cannot be invoked again.
*
* @param {Function} fn
* @param {Number} durationMs
* @returns {Function}
*/
function debounce(fn, durationMs) {
var id = ++debounceId;
var timer = 0;
var lastTime = 0;
var isCanceled = false;
var tick = function (time) {
if (isCanceled) return;
if (lastTime) timer -= time - lastTime;
lastTime = time;
if (timer > 0) {
addDebounceTick(id, tick);
} else {
timer = lastTime = 0;
fn();
}
};
return function (cancel) {
if (isCanceled) return;
if (durationMs <= 0) {
if (cancel !== true) fn();
return;
}
if (cancel === true) {
isCanceled = true;
timer = lastTime = 0;
tick = undefined;
cancelDebounceTick(id);
return;
}
if (timer <= 0) {
timer = durationMs;
tick(0);
} else {
timer = durationMs;
}
};
}
var htmlCollectionType = '[object HTMLCollection]';
var nodeListType = '[object NodeList]';
/**
* Check if a value is a node list or a html collection.
*
* @param {*} val
* @returns {Boolean}
*/
function isNodeList(val) {
var type = Object.prototype.toString.call(val);
return type === htmlCollectionType || type === nodeListType;
}
var objectType = 'object';
var objectToStringType = '[object Object]';
var toString = Object.prototype.toString;
/**
* Check if a value is a plain object.
*
* @param {*} val
* @returns {Boolean}
*/
function isPlainObject(val) {
return typeof val === objectType && toString.call(val) === objectToStringType;
}
function noop() {}
/**
* Converts a value to an array or clones an array.
*
* @param {*} val
* @returns {Array}
*/
function toArray(val) {
return isNodeList(val) ? Array.prototype.slice.call(val) : Array.prototype.concat(val);
}
var NUMBER_TYPE = 'number';
var STRING_TYPE = 'string';
var INSTANT_LAYOUT = 'instant';
var layoutId = 0;
/**
* Creates a new Grid instance.
*
* @class
* @param {(HTMLElement|String)} element
* @param {Object} [options]
* @param {(String|HTMLElement[]|NodeList|HTMLCollection)} [options.items="*"]
* @param {Number} [options.showDuration=300]
* @param {String} [options.showEasing="ease"]
* @param {Object} [options.visibleStyles={opacity: "1", transform: "scale(1)"}]
* @param {Number} [options.hideDuration=300]
* @param {String} [options.hideEasing="ease"]
* @param {Object} [options.hiddenStyles={opacity: "0", transform: "scale(0.5)"}]
* @param {(Function|Object)} [options.layout]
* @param {Boolean} [options.layout.fillGaps=false]
* @param {Boolean} [options.layout.horizontal=false]
* @param {Boolean} [options.layout.alignRight=false]
* @param {Boolean} [options.layout.alignBottom=false]
* @param {Boolean} [options.layout.rounding=false]
* @param {(Boolean|Number)} [options.layoutOnResize=150]
* @param {Boolean} [options.layoutOnInit=true]
* @param {Number} [options.layoutDuration=300]
* @param {String} [options.layoutEasing="ease"]
* @param {?Object} [options.sortData=null]
* @param {Boolean} [options.dragEnabled=false]
* @param {?String} [options.dragHandle=null]
* @param {?HtmlElement} [options.dragContainer=null]
* @param {?Function} [options.dragStartPredicate]
* @param {Number} [options.dragStartPredicate.distance=0]
* @param {Number} [options.dragStartPredicate.delay=0]
* @param {String} [options.dragAxis="xy"]
* @param {(Boolean|Function)} [options.dragSort=true]
* @param {Object} [options.dragSortHeuristics]
* @param {Number} [options.dragSortHeuristics.sortInterval=100]
* @param {Number} [options.dragSortHeuristics.minDragDistance=10]
* @param {Number} [options.dragSortHeuristics.minBounceBackAngle=1]
* @param {(Function|Object)} [options.dragSortPredicate]
* @param {Number} [options.dragSortPredicate.threshold=50]
* @param {String} [options.dragSortPredicate.action="move"]
* @param {String} [options.dragSortPredicate.migrateAction="move"]
* @param {Object} [options.dragRelease]
* @param {Number} [options.dragRelease.duration=300]
* @param {String} [options.dragRelease.easing="ease"]
* @param {Boolean} [options.dragRelease.useDragContainer=true]
* @param {Object} [options.dragCssProps]
* @param {Object} [options.dragPlaceholder]
* @param {Boolean} [options.dragPlaceholder.enabled=false]
* @param {?Function} [options.dragPlaceholder.createElement=null]
* @param {?Function} [options.dragPlaceholder.onCreate=null]
* @param {?Function} [options.dragPlaceholder.onRemove=null]
* @param {Object} [options.dragAutoScroll]
* @param {(Function|Array)} [options.dragAutoScroll.targets=[]]
* @param {?Function} [options.dragAutoScroll.handle=null]
* @param {Number} [options.dragAutoScroll.threshold=50]
* @param {Number} [options.dragAutoScroll.safeZone=0.2]
* @param {(Function|Number)} [options.dragAutoScroll.speed]
* @param {Boolean} [options.dragAutoScroll.sortDuringScroll=true]
* @param {Boolean} [options.dragAutoScroll.smoothStop=false]
* @param {?Function} [options.dragAutoScroll.onStart=null]
* @param {?Function} [options.dragAutoScroll.onStop=null]
* @param {String} [options.containerClass="muuri"]
* @param {String} [options.itemClass="muuri-item"]
* @param {String} [options.itemVisibleClass="muuri-item-visible"]
* @param {String} [options.itemHiddenClass="muuri-item-hidden"]
* @param {String} [options.itemPositioningClass="muuri-item-positioning"]
* @param {String} [options.itemDraggingClass="muuri-item-dragging"]
* @param {String} [options.itemReleasingClass="muuri-item-releasing"]
* @param {String} [options.itemPlaceholderClass="muuri-item-placeholder"]
*/
function Grid(element, options) {
// Allow passing element as selector string
if (typeof element === STRING_TYPE) {
element = document.querySelector(element);
}
// Throw an error if the container element is not body element or does not
// exist within the body element.
var isElementInDom = element.getRootNode
? element.getRootNode({ composed: true }) === document
: document.body.contains(element);
if (!isElementInDom || element === document.documentElement) {
throw new Error('Container element must be an existing DOM element.');
}
// Create instance settings by merging the options with default options.
var settings = mergeSettings(Grid.defaultOptions, options);
settings.visibleStyles = normalizeStyles(settings.visibleStyles);
settings.hiddenStyles = normalizeStyles(settings.hiddenStyles);
if (!isFunction(settings.dragSort)) {
settings.dragSort = !!settings.dragSort;
}
this._id = createUid();
this._element = element;
this._settings = settings;
this._isDestroyed = false;
this._items = [];
this._layout = {
id: 0,
items: [],
slots: [],
};
this._isLayoutFinished = true;
this._nextLayoutData = null;
this._emitter = new Emitter();
this._onLayoutDataReceived = this._onLayoutDataReceived.bind(this);
// Store grid instance to the grid instances collection.
GRID_INSTANCES[this._id] = this;
// Add container element's class name.
addClass(element, settings.containerClass);
// If layoutOnResize option is a valid number sanitize it and bind the resize
// handler.
bindLayoutOnResize(this, settings.layoutOnResize);
// Add initial items.
this.add(getInitialGridElements(element, settings.items), { layout: false });
// Layout on init if necessary.
if (settings.layoutOnInit) {
this.layout(true);
}
}
/**
* Public properties
* *****************
*/
/**
* @public
* @static
* @see Item
*/
Grid.Item = Item;
/**
* @public
* @static
* @see ItemLayout
*/
Grid.ItemLayout = ItemLayout;
/**
* @public
* @static
* @see ItemVisibility
*/
Grid.ItemVisibility = ItemVisibility;
/**
* @public
* @static
* @see ItemMigrate
*/
Grid.ItemMigrate = ItemMigrate;
/**
* @public
* @static
* @see ItemDrag
*/
Grid.ItemDrag = ItemDrag;
/**
* @public
* @static
* @see ItemDragRelease
*/
Grid.ItemDragRelease = ItemDragRelease;
/**
* @public
* @static
* @see ItemDragPlaceholder
*/
Grid.ItemDragPlaceholder = ItemDragPlaceholder;
/**
* @public
* @static
* @see Emitter
*/
Grid.Emitter = Emitter;
/**
* @public
* @static
* @see Animator
*/
Grid.Animator = Animator;
/**
* @public
* @static
* @see Dragger
*/
Grid.Dragger = Dragger;
/**
* @public
* @static
* @see Packer
*/
Grid.Packer = Packer;
/**
* @public
* @static
* @see AutoScroller
*/
Grid.AutoScroller = AutoScroller;
/**
* The default Packer instance used by default for all layouts.
*
* @public
* @static
* @type {Packer}
*/
Grid.defaultPacker = new Packer(2);
/**
* Default options for Grid instance.
*
* @public
* @static
* @type {Object}
*/
Grid.defaultOptions = {
// Initial item elements
items: '*',
// Default show animation
showDuration: 300,
showEasing: 'ease',
// Default hide animation
hideDuration: 300,
hideEasing: 'ease',
// Item's visible/hidden state styles
visibleStyles: {
opacity: '1',
transform: 'scale(1)',
},
hiddenStyles: {
opacity: '0',
transform: 'scale(0.5)',
},
// Layout
layout: {
fillGaps: false,
horizontal: false,
alignRight: false,
alignBottom: false,
rounding: false,
},
layoutOnResize: 150,
layoutOnInit: true,
layoutDuration: 300,
layoutEasing: 'ease',
// Sorting
sortData: null,
// Drag & Drop
dragEnabled: false,
dragContainer: null,
dragHandle: null,
dragStartPredicate: {
distance: 0,
delay: 0,
},
dragAxis: 'xy',
dragSort: true,
dragSortHeuristics: {
sortInterval: 100,
minDragDistance: 10,
minBounceBackAngle: 1,
},
dragSortPredicate: {
threshold: 50,
action: ACTION_MOVE,
migrateAction: ACTION_MOVE,
},
dragRelease: {
duration: 300,
easing: 'ease',
useDragContainer: true,
},
dragCssProps: {
touchAction: 'none',
userSelect: 'none',
userDrag: 'none',
tapHighlightColor: 'rgba(0, 0, 0, 0)',
touchCallout: 'none',
contentZooming: 'none',
},
dragPlaceholder: {
enabled: false,
createElement: null,
onCreate: null,
onRemove: null,
},
dragAutoScroll: {
targets: [],
handle: null,
threshold: 50,
safeZone: 0.2,
speed: AutoScroller.smoothSpeed(1000, 2000, 2500),
sortDuringScroll: true,
smoothStop: false,
onStart: null,
onStop: null,
},
// Classnames
containerClass: 'muuri',
itemClass: 'muuri-item',
itemVisibleClass: 'muuri-item-shown',
itemHiddenClass: 'muuri-item-hidden',
itemPositioningClass: 'muuri-item-positioning',
itemDraggingClass: 'muuri-item-dragging',
itemReleasingClass: 'muuri-item-releasing',
itemPlaceholderClass: 'muuri-item-placeholder',
};
/**
* Public prototype methods
* ************************
*/
/**
* Bind an event listener.
*
* @public
* @param {String} event
* @param {Function} listener
* @returns {Grid}
*/
Grid.prototype.on = function (event, listener) {
this._emitter.on(event, listener);
return this;
};
/**
* Unbind an event listener.
*
* @public
* @param {String} event
* @param {Function} listener
* @returns {Grid}
*/
Grid.prototype.off = function (event, listener) {
this._emitter.off(event, listener);
return this;
};
/**
* Get the container element.
*
* @public
* @returns {HTMLElement}
*/
Grid.prototype.getElement = function () {
return this._element;
};
/**
* Get instance's item by element or by index. Target can also be an Item
* instance in which case the function returns the item if it exists within
* related Grid instance. If nothing is found with the provided target, null
* is returned.
*
* @private
* @param {(HtmlElement|Number|Item)} [target]
* @returns {?Item}
*/
Grid.prototype.getItem = function (target) {
// If no target is specified or the instance is destroyed, return null.
if (this._isDestroyed || (!target && target !== 0)) {
return null;
}
// If target is number return the item in that index. If the number is lower
// than zero look for the item starting from the end of the items array. For
// example -1 for the last item, -2 for the second last item, etc.
if (typeof target === NUMBER_TYPE) {
return this._items[target > -1 ? target : this._items.length + target] || null;
}
// If the target is an instance of Item return it if it is attached to this
// Grid instance, otherwise return null.
if (target instanceof Item) {
return target._gridId === this._id ? target : null;
}
// In other cases let's assume that the target is an element, so let's try
// to find an item that matches the element and return it. If item is not
// found return null.
if (ITEM_ELEMENT_MAP) {
var item = ITEM_ELEMENT_MAP.get(target);
return item && item._gridId === this._id ? item : null;
} else {
for (var i = 0; i < this._items.length; i++) {
if (this._items[i]._element === target) {
return this._items[i];
}
}
}
return null;
};
/**
* Get all items. Optionally you can provide specific targets (elements,
* indices and item instances). All items that are not found are omitted from
* the returned array.
*
* @public
* @param {(HtmlElement|Number|Item|Array)} [targets]
* @returns {Item[]}
*/
Grid.prototype.getItems = function (targets) {
// Return all items immediately if no targets were provided or if the
// instance is destroyed.
if (this._isDestroyed || targets === undefined) {
return this._items.slice(0);
}
var items = [];
var i, item;
if (Array.isArray(targets) || isNodeList(targets)) {
for (i = 0; i < targets.length; i++) {
item = this.getItem(targets[i]);
if (item) items.push(item);
}
} else {
item = this.getItem(targets);
if (item) items.push(item);
}
return items;
};
/**
* Update the cached dimensions of the instance's items. By default all the
* items are refreshed, but you can also provide an array of target items as the
* first argument if you want to refresh specific items. Note that all hidden
* items are not refreshed by default since their "display" property is "none"
* and their dimensions are therefore not readable from the DOM. However, if you
* do want to force update hidden item dimensions too you can provide `true`
* as the second argument, which makes the elements temporarily visible while
* their dimensions are being read.
*
* @public
* @param {Item[]} [items]
* @param {Boolean} [force=false]
* @returns {Grid}
*/
Grid.prototype.refreshItems = function (items, force) {
if (this._isDestroyed) return this;
var targets = items || this._items;
var i, item, style, hiddenItemStyles;
if (force === true) {
hiddenItemStyles = [];
for (i = 0; i < targets.length; i++) {
item = targets[i];
if (!item.isVisible() && !item.isHiding()) {
style = item.getElement().style;
style.visibility = 'hidden';
style.display = '';
hiddenItemStyles.push(style);
}
}
}
for (i = 0; i < targets.length; i++) {
targets[i]._refreshDimensions(force);
}
if (force === true) {
for (i = 0; i < hiddenItemStyles.length; i++) {
style = hiddenItemStyles[i];
style.visibility = '';
style.display = 'none';
}
hiddenItemStyles.length = 0;
}
return this;
};
/**
* Update the sort data of the instance's items. By default all the items are
* refreshed, but you can also provide an array of target items if you want to
* refresh specific items.
*
* @public
* @param {Item[]} [items]
* @returns {Grid}
*/
Grid.prototype.refreshSortData = function (items) {
if (this._isDestroyed) return this;
var targets = items || this._items;
for (var i = 0; i < targets.length; i++) {
targets[i]._refreshSortData();
}
return this;
};
/**
* Synchronize the item elements to match the order of the items in the DOM.
* This comes handy if you need to keep the DOM structure matched with the
* order of the items. Note that if an item's element is not currently a child
* of the container element (if it is dragged for example) it is ignored and
* left untouched.
*
* @public
* @returns {Grid}
*/
Grid.prototype.synchronize = function () {
if (this._isDestroyed) return this;
var items = this._items;
if (!items.length) return this;
var fragment;
var element;
for (var i = 0; i < items.length; i++) {
element = items[i]._element;
if (element.parentNode === this._element) {
fragment = fragment || document.createDocumentFragment();
fragment.appendChild(element);
}
}
if (!fragment) return this;
this._element.appendChild(fragment);
this._emit(EVENT_SYNCHRONIZE);
return this;
};
/**
* Calculate and apply item positions.
*
* @public
* @param {Boolean} [instant=false]
* @param {Function} [onFinish]
* @returns {Grid}
*/
Grid.prototype.layout = function (instant, onFinish) {
if (this._isDestroyed) return this;
// Cancel unfinished layout algorithm if possible.
var unfinishedLayout = this._nextLayoutData;
if (unfinishedLayout && isFunction(unfinishedLayout.cancel)) {
unfinishedLayout.cancel();
}
// Compute layout id (let's stay in Float32 range).
layoutId = (layoutId % MAX_SAFE_FLOAT32_INTEGER) + 1;
var nextLayoutId = layoutId;
// Store data for next layout.
this._nextLayoutData = {
id: nextLayoutId,
instant: instant,
onFinish: onFinish,
cancel: null,
};
// Collect layout items (all active grid items).
var items = this._items;
var layoutItems = [];
for (var i = 0; i < items.length; i++) {
if (items[i]._isActive) layoutItems.push(items[i]);
}
// Compute new layout.
this._refreshDimensions();
var gridWidth = this._width - this._borderLeft - this._borderRight;
var gridHeight = this._height - this._borderTop - this._borderBottom;
var layoutSettings = this._settings.layout;
var cancelLayout;
if (isFunction(layoutSettings)) {
cancelLayout = layoutSettings(
this,
nextLayoutId,
layoutItems,
gridWidth,
gridHeight,
this._onLayoutDataReceived
);
} else {
Grid.defaultPacker.setOptions(layoutSettings);
cancelLayout = Grid.defaultPacker.createLayout(
this,
nextLayoutId,
layoutItems,
gridWidth,
gridHeight,
this._onLayoutDataReceived
);
}
// Store layout cancel method if available.
if (
isFunction(cancelLayout) &&
this._nextLayoutData &&
this._nextLayoutData.id === nextLayoutId
) {
this._nextLayoutData.cancel = cancelLayout;
}
return this;
};
/**
* Add new items by providing the elements you wish to add to the instance and
* optionally provide the index where you want the items to be inserted into.
* All elements that are not already children of the container element will be
* automatically appended to the container element. If an element has it's CSS
* display property set to "none" it will be marked as inactive during the
* initiation process. As long as the item is inactive it will not be part of
* the layout, but it will retain it's index. You can activate items at any
* point with grid.show() method. This method will automatically call
* grid.layout() if one or more of the added elements are visible. If only
* hidden items are added no layout will be called. All the new visible items
* are positioned without animation during their first layout.
*
* @public
* @param {(HTMLElement|HTMLElement[])} elements
* @param {Object} [options]
* @param {Number} [options.index=-1]
* @param {Boolean} [options.active]
* @param {(Boolean|Function|String)} [options.layout=true]
* @returns {Item[]}
*/
Grid.prototype.add = function (elements, options) {
if (this._isDestroyed || !elements) return [];
var newItems = toArray(elements);
if (!newItems.length) return newItems;
var opts = options || {};
var layout = opts.layout ? opts.layout : opts.layout === undefined;
var items = this._items;
var needsLayout = false;
var fragment;
var element;
var item;
var i;
// Collect all the elements that are not child of the grid element into a
// document fragment.
for (i = 0; i < newItems.length; i++) {
element = newItems[i];
if (element.parentNode !== this._element) {
fragment = fragment || document.createDocumentFragment();
fragment.appendChild(element);
}
}
// If we have a fragment, let's append it to the grid element. We could just
// not do this and the `new Item()` instantiation would handle this for us,
// but this way we can add the elements into the DOM a bit faster.
if (fragment) {
this._element.appendChild(fragment);
}
// Map provided elements into new grid items.
for (i = 0; i < newItems.length; i++) {
element = newItems[i];
item = newItems[i] = new Item(this, element, opts.active);
// If the item to be added is active, we need to do a layout. Also, we
// need to mark the item with the skipNextAnimation flag to make it
// position instantly (without animation) during the next layout. Without
// the hack the item would animate to it's new position from the northwest
// corner of the grid, which feels a bit buggy (imho).
if (item._isActive) {
needsLayout = true;
item._layout._skipNextAnimation = true;
}
}
// Set up the items' initial dimensions and sort data. This needs to be done
// in a separate loop to avoid layout thrashing.
for (i = 0; i < newItems.length; i++) {
item = newItems[i];
item._refreshDimensions();
item._refreshSortData();
}
// Add the new items to the items collection to correct index.
arrayInsert(items, newItems, opts.index);
// Emit add event.
if (this._hasListeners(EVENT_ADD)) {
this._emit(EVENT_ADD, newItems.slice(0));
}
// If layout is needed.
if (needsLayout && layout) {
this.layout(layout === INSTANT_LAYOUT, isFunction(layout) ? layout : undefined);
}
return newItems;
};
/**
* Remove items from the instance.
*
* @public
* @param {Item[]} items
* @param {Object} [options]
* @param {Boolean} [options.removeElements=false]
* @param {(Boolean|Function|String)} [options.layout=true]
* @returns {Item[]}
*/
Grid.prototype.remove = function (items, options) {
if (this._isDestroyed || !items.length) return [];
var opts = options || {};
var layout = opts.layout ? opts.layout : opts.layout === undefined;
var needsLayout = false;
var allItems = this.getItems();
var targetItems = [];
var indices = [];
var index;
var item;
var i;
// Remove the individual items.
for (i = 0; i < items.length; i++) {
item = items[i];
if (item._isDestroyed) continue;
index = this._items.indexOf(item);
if (index === -1) continue;
if (item._isActive) needsLayout = true;
targetItems.push(item);
indices.push(allItems.indexOf(item));
item._destroy(opts.removeElements);
this._items.splice(index, 1);
}
// Emit remove event.
if (this._hasListeners(EVENT_REMOVE)) {
this._emit(EVENT_REMOVE, targetItems.slice(0), indices);
}
// If layout is needed.
if (needsLayout && layout) {
this.layout(layout === INSTANT_LAYOUT, isFunction(layout) ? layout : undefined);
}
return targetItems;
};
/**
* Show specific instance items.
*
* @public
* @param {Item[]} items
* @param {Object} [options]
* @param {Boolean} [options.instant=false]
* @param {Boolean} [options.syncWithLayout=true]
* @param {Function} [options.onFinish]
* @param {(Boolean|Function|String)} [options.layout=true]
* @returns {Grid}
*/
Grid.prototype.show = function (items, options) {
if (!this._isDestroyed && items.length) {
this._setItemsVisibility(items, true, options);
}
return this;
};
/**
* Hide specific instance items.
*
* @public
* @param {Item[]} items
* @param {Object} [options]
* @param {Boolean} [options.instant=false]
* @param {Boolean} [options.syncWithLayout=true]
* @param {Function} [options.onFinish]
* @param {(Boolean|Function|String)} [options.layout=true]
* @returns {Grid}
*/
Grid.prototype.hide = function (items, options) {
if (!this._isDestroyed && items.length) {
this._setItemsVisibility(items, false, options);
}
return this;
};
/**
* Filter items. Expects at least one argument, a predicate, which should be
* either a function or a string. The predicate callback is executed for every
* item in the instance. If the return value of the predicate is truthy the
* item in question will be shown and otherwise hidden. The predicate callback
* receives the item instance as it's argument. If the predicate is a string
* it is considered to be a selector and it is checked against every item
* element in the instance with the native element.matches() method. All the
* matching items will be shown and others hidden.
*
* @public
* @param {(Function|String)} predicate
* @param {Object} [options]
* @param {Boolean} [options.instant=false]
* @param {Boolean} [options.syncWithLayout=true]
* @param {FilterCallback} [options.onFinish]
* @param {(Boolean|Function|String)} [options.layout=true]
* @returns {Grid}
*/
Grid.prototype.filter = function (predicate, options) {
if (this._isDestroyed || !this._items.length) return this;
var itemsToShow = [];
var itemsToHide = [];
var isPredicateString = typeof predicate === STRING_TYPE;
var isPredicateFn = isFunction(predicate);
var opts = options || {};
var isInstant = opts.instant === true;
var syncWithLayout = opts.syncWithLayout;
var layout = opts.layout ? opts.layout : opts.layout === undefined;
var onFinish = isFunction(opts.onFinish) ? opts.onFinish : null;
var tryFinishCounter = -1;
var tryFinish = noop;
var item;
var i;
// If we have onFinish callback, let's create proper tryFinish callback.
if (onFinish) {
tryFinish = function () {
++tryFinishCounter && onFinish(itemsToShow.slice(0), itemsToHide.slice(0));
};
}
// Check which items need to be shown and which hidden.
if (isPredicateFn || isPredicateString) {
for (i = 0; i < this._items.length; i++) {
item = this._items[i];
if (isPredicateFn ? predicate(item) : elementMatches(item._element, predicate)) {
itemsToShow.push(item);
} else {
itemsToHide.push(item);
}
}
}
// Show items that need to be shown.
if (itemsToShow.length) {
this.show(itemsToShow, {
instant: isInstant,
syncWithLayout: syncWithLayout,
onFinish: tryFinish,
layout: false,
});
} else {
tryFinish();
}
// Hide items that need to be hidden.
if (itemsToHide.length) {
this.hide(itemsToHide, {
instant: isInstant,
syncWithLayout: syncWithLayout,
onFinish: tryFinish,
layout: false,
});
} else {
tryFinish();
}
// If there are any items to filter.
if (itemsToShow.length || itemsToHide.length) {
// Emit filter event.
if (this._hasListeners(EVENT_FILTER)) {
this._emit(EVENT_FILTER, itemsToShow.slice(0), itemsToHide.slice(0));
}
// If layout is needed.
if (layout) {
this.layout(layout === INSTANT_LAYOUT, isFunction(layout) ? layout : undefined);
}
}
return this;
};
/**
* Sort items. There are three ways to sort the items. The first is simply by
* providing a function as the comparer which works identically to native
* array sort. Alternatively you can sort by the sort data you have provided
* in the instance's options. Just provide the sort data key(s) as a string
* (separated by space) and the items will be sorted based on the provided
* sort data keys. Lastly you have the opportunity to provide a presorted
* array of items which will be used to sync the internal items array in the
* same order.
*
* @public
* @param {(Function|String|Item[])} comparer
* @param {Object} [options]
* @param {Boolean} [options.descending=false]
* @param {(Boolean|Function|String)} [options.layout=true]
* @returns {Grid}
*/
Grid.prototype.sort = (function () {
var sortComparer;
var isDescending;
var origItems;
var indexMap;
function defaultComparer(a, b) {
var result = 0;
var criteriaName;
var criteriaOrder;
var valA;
var valB;
// Loop through the list of sort criteria.
for (var i = 0; i < sortComparer.length; i++) {
// Get the criteria name, which should match an item's sort data key.
criteriaName = sortComparer[i][0];
criteriaOrder = sortComparer[i][1];
// Get items' cached sort values for the criteria. If the item has no sort
// data let's update the items sort data (this is a lazy load mechanism).
valA = (a._sortData ? a : a._refreshSortData())._sortData[criteriaName];
valB = (b._sortData ? b : b._refreshSortData())._sortData[criteriaName];
// Sort the items in descending order if defined so explicitly. Otherwise
// sort items in ascending order.
if (criteriaOrder === 'desc' || (!criteriaOrder && isDescending)) {
result = valB < valA ? -1 : valB > valA ? 1 : 0;
} else {
result = valA < valB ? -1 : valA > valB ? 1 : 0;
}
// If we have -1 or 1 as the return value, let's return it immediately.
if (result) return result;
}
// If values are equal let's compare the item indices to make sure we
// have a stable sort. Note that this is not necessary in evergreen browsers
// because Array.sort() is nowadays stable. However, in order to guarantee
// same results in older browsers we need this.
if (!result) {
if (!indexMap) indexMap = createIndexMap(origItems);
result = isDescending ? compareIndexMap(indexMap, b, a) : compareIndexMap(indexMap, a, b);
}
return result;
}
function customComparer(a, b) {
var result = isDescending ? -sortComparer(a, b) : sortComparer(a, b);
if (!result) {
if (!indexMap) indexMap = createIndexMap(origItems);
result = isDescending ? compareIndexMap(indexMap, b, a) : compareIndexMap(indexMap, a, b);
}
return result;
}
return function (comparer, options) {
if (this._isDestroyed || this._items.length < 2) return this;
var items = this._items;
var opts = options || {};
var layout = opts.layout ? opts.layout : opts.layout === undefined;
// Setup parent scope data.
isDescending = !!opts.descending;
origItems = items.slice(0);
indexMap = null;
// If function is provided do a native array sort.
if (isFunction(comparer)) {
sortComparer = comparer;
items.sort(customComparer);
}
// Otherwise if we got a string, let's sort by the sort data as provided in
// the instance's options.
else if (typeof comparer === STRING_TYPE) {
sortComparer = comparer
.trim()
.split(' ')
.filter(function (val) {
return val;
})
.map(function (val) {
return val.split(':');
});
items.sort(defaultComparer);
}
// Otherwise if we got an array, let's assume it's a presorted array of the
// items and order the items based on it. Here we blindly trust that the
// presorted array consists of the same item instances as the current
// `gird._items` array.
else if (Array.isArray(comparer)) {
items.length = 0;
items.push.apply(items, comparer);
}
// Otherwise let's throw an error.
else {
sortComparer = isDescending = origItems = indexMap = null;
throw new Error('Invalid comparer argument provided.');
}
// Emit sort event.
if (this._hasListeners(EVENT_SORT)) {
this._emit(EVENT_SORT, items.slice(0), origItems);
}
// If layout is needed.
if (layout) {
this.layout(layout === INSTANT_LAYOUT, isFunction(layout) ? layout : undefined);
}
// Reset data (to avoid mem leaks).
sortComparer = isDescending = origItems = indexMap = null;
return this;
};
})();
/**
* Move item to another index or in place of another item.
*
* @public
* @param {(HtmlElement|Number|Item)} item
* @param {(HtmlElement|Number|Item)} position
* @param {Object} [options]
* @param {String} [options.action="move"]
* - Accepts either "move" or "swap".
* - "move" moves the item in place of the other item.
* - "swap" swaps the position of the items.
* @param {(Boolean|Function|String)} [options.layout=true]
* @returns {Grid}
*/
Grid.prototype.move = function (item, position, options) {
if (this._isDestroyed || this._items.length < 2) return this;
var items = this._items;
var opts = options || {};
var layout = opts.layout ? opts.layout : opts.layout === undefined;
var isSwap = opts.action === ACTION_SWAP;
var action = isSwap ? ACTION_SWAP : ACTION_MOVE;
var fromItem = this.getItem(item);
var toItem = this.getItem(position);
var fromIndex;
var toIndex;
// Make sure the items exist and are not the same.
if (fromItem && toItem && fromItem !== toItem) {
// Get the indices of the items.
fromIndex = items.indexOf(fromItem);
toIndex = items.indexOf(toItem);
// Do the move/swap.
if (isSwap) {
arraySwap(items, fromIndex, toIndex);
} else {
arrayMove(items, fromIndex, toIndex);
}
// Emit move event.
if (this._hasListeners(EVENT_MOVE)) {
this._emit(EVENT_MOVE, {
item: fromItem,
fromIndex: fromIndex,
toIndex: toIndex,
action: action,
});
}
// If layout is needed.
if (layout) {
this.layout(layout === INSTANT_LAYOUT, isFunction(layout) ? layout : undefined);
}
}
return this;
};
/**
* Send item to another Grid instance.
*
* @public
* @param {(HtmlElement|Number|Item)} item
* @param {Grid} targetGrid
* @param {(HtmlElement|Number|Item)} position
* @param {Object} [options]
* @param {HTMLElement} [options.appendTo=document.body]
* @param {(Boolean|Function|String)} [options.layoutSender=true]
* @param {(Boolean|Function|String)} [options.layoutReceiver=true]
* @returns {Grid}
*/
Grid.prototype.send = function (item, targetGrid, position, options) {
if (this._isDestroyed || targetGrid._isDestroyed || this === targetGrid) return this;
// Make sure we have a valid target item.
item = this.getItem(item);
if (!item) return this;
var opts = options || {};
var container = opts.appendTo || document.body;
var layoutSender = opts.layoutSender ? opts.layoutSender : opts.layoutSender === undefined;
var layoutReceiver = opts.layoutReceiver
? opts.layoutReceiver
: opts.layoutReceiver === undefined;
// Start the migration process.
item._migrate.start(targetGrid, position, container);
// If migration was started successfully and the item is active, let's layout
// the grids.
if (item._migrate._isActive && item._isActive) {
if (layoutSender) {
this.layout(
layoutSender === INSTANT_LAYOUT,
isFunction(layoutSender) ? layoutSender : undefined
);
}
if (layoutReceiver) {
targetGrid.layout(
layoutReceiver === INSTANT_LAYOUT,
isFunction(layoutReceiver) ? layoutReceiver : undefined
);
}
}
return this;
};
/**
* Destroy the instance.
*
* @public
* @param {Boolean} [removeElements=false]
* @returns {Grid}
*/
Grid.prototype.destroy = function (removeElements) {
if (this._isDestroyed) return this;
var container = this._element;
var items = this._items.slice(0);
var layoutStyles = (this._layout && this._layout.styles) || {};
var i, prop;
// Unbind window resize event listener.
unbindLayoutOnResize(this);
// Destroy items.
for (i = 0; i < items.length; i++) items[i]._destroy(removeElements);
this._items.length = 0;
// Restore container.
removeClass(container, this._settings.containerClass);
for (prop in layoutStyles) container.style[prop] = '';
// Emit destroy event and unbind all events.
this._emit(EVENT_DESTROY);
this._emitter.destroy();
// Remove reference from the grid instances collection.
delete GRID_INSTANCES[this._id];
// Flag instance as destroyed.
this._isDestroyed = true;
return this;
};
/**
* Private prototype methods
* *************************
*/
/**
* Emit a grid event.
*
* @private
* @param {String} event
* @param {...*} [arg]
*/
Grid.prototype._emit = function () {
if (this._isDestroyed) return;
this._emitter.emit.apply(this._emitter, arguments);
};
/**
* Check if there are any events listeners for an event.
*
* @private
* @param {String} event
* @returns {Boolean}
*/
Grid.prototype._hasListeners = function (event) {
if (this._isDestroyed) return false;
return this._emitter.countListeners(event) > 0;
};
/**
* Update container's width, height and offsets.
*
* @private
*/
Grid.prototype._updateBoundingRect = function () {
var element = this._element;
var rect = element.getBoundingClientRect();
this._width = rect.width;
this._height = rect.height;
this._left = rect.left;
this._top = rect.top;
this._right = rect.right;
this._bottom = rect.bottom;
};
/**
* Update container's border sizes.
*
* @private
* @param {Boolean} left
* @param {Boolean} right
* @param {Boolean} top
* @param {Boolean} bottom
*/
Grid.prototype._updateBorders = function (left, right, top, bottom) {
var element = this._element;
if (left) this._borderLeft = getStyleAsFloat(element, 'border-left-width');
if (right) this._borderRight = getStyleAsFloat(element, 'border-right-width');
if (top) this._borderTop = getStyleAsFloat(element, 'border-top-width');
if (bottom) this._borderBottom = getStyleAsFloat(element, 'border-bottom-width');
};
/**
* Refresh all of container's internal dimensions and offsets.
*
* @private
*/
Grid.prototype._refreshDimensions = function () {
this._updateBoundingRect();
this._updateBorders(1, 1, 1, 1);
this._boxSizing = getStyle(this._element, 'box-sizing');
};
/**
* Calculate and apply item positions.
*
* @private
* @param {Object} layout
*/
Grid.prototype._onLayoutDataReceived = (function () {
var itemsToLayout = [];
return function (layout) {
if (this._isDestroyed || !this._nextLayoutData || this._nextLayoutData.id !== layout.id) return;
var grid = this;
var instant = this._nextLayoutData.instant;
var onFinish = this._nextLayoutData.onFinish;
var numItems = layout.items.length;
var counter = numItems;
var item;
var left;
var top;
var i;
// Reset next layout data.
this._nextLayoutData = null;
if (!this._isLayoutFinished && this._hasListeners(EVENT_LAYOUT_ABORT)) {
this._emit(EVENT_LAYOUT_ABORT, this._layout.items.slice(0));
}
// Update the layout reference.
this._layout = layout;
// Update the item positions and collect all items that need to be laid
// out. It is critical that we update the item position _before_ the
// layoutStart event as the new data might be needed in the callback.
itemsToLayout.length = 0;
for (i = 0; i < numItems; i++) {
item = layout.items[i];
// Make sure we have a matching item.
if (!item) {
--counter;
continue;
}
// Get the item's new left and top values.
left = layout.slots[i * 2];
top = layout.slots[i * 2 + 1];
// Let's skip the layout process if we can. Possibly avoids a lot of DOM
// operations which saves us some CPU cycles.
if (item._canSkipLayout(left, top)) {
--counter;
continue;
}
// Update the item's position.
item._left = left;
item._top = top;
// Only active non-dragged items need to be moved.
if (item.isActive() && !item.isDragging()) {
itemsToLayout.push(item);
}
}
// Set layout styles to the grid element.
if (layout.styles) {
setStyles(this._element, layout.styles);
}
// layoutStart event is intentionally emitted after the container element's
// dimensions are set, because otherwise there would be no hook for reacting
// to container dimension changes.
if (this._hasListeners(EVENT_LAYOUT_START)) {
this._emit(EVENT_LAYOUT_START, layout.items.slice(0), instant === true);
}
function tryFinish() {
if (--counter > 0) return;
var hasLayoutChanged = grid._layout.id !== layout.id;
var callback = isFunction(instant) ? instant : onFinish;
if (!hasLayoutChanged) {
grid._isLayoutFinished = true;
}
if (isFunction(callback)) {
callback(layout.items.slice(0), hasLayoutChanged);
}
if (!hasLayoutChanged && grid._hasListeners(EVENT_LAYOUT_END)) {
grid._emit(EVENT_LAYOUT_END, layout.items.slice(0));
}
}
if (!itemsToLayout.length) {
tryFinish();
return this;
}
this._isLayoutFinished = false;
for (i = 0; i < itemsToLayout.length; i++) {
if (this._layout.id !== layout.id) break;
itemsToLayout[i]._layout.start(instant === true, tryFinish);
}
if (this._layout.id === layout.id) {
itemsToLayout.length = 0;
}
return this;
};
})();
/**
* Show or hide Grid instance's items.
*
* @private
* @param {Item[]} items
* @param {Boolean} toVisible
* @param {Object} [options]
* @param {Boolean} [options.instant=false]
* @param {Boolean} [options.syncWithLayout=true]
* @param {Function} [options.onFinish]
* @param {(Boolean|Function|String)} [options.layout=true]
*/
Grid.prototype._setItemsVisibility = function (items, toVisible, options) {
var grid = this;
var targetItems = items.slice(0);
var opts = options || {};
var isInstant = opts.instant === true;
var callback = opts.onFinish;
var layout = opts.layout ? opts.layout : opts.layout === undefined;
var counter = targetItems.length;
var startEvent = toVisible ? EVENT_SHOW_START : EVENT_HIDE_START;
var endEvent = toVisible ? EVENT_SHOW_END : EVENT_HIDE_END;
var method = toVisible ? 'show' : 'hide';
var needsLayout = false;
var completedItems = [];
var hiddenItems = [];
var item;
var i;
// If there are no items call the callback, but don't emit any events.
if (!counter) {
if (isFunction(callback)) callback(targetItems);
return;
}
// Prepare the items.
for (i = 0; i < targetItems.length; i++) {
item = targetItems[i];
// If inactive item is shown or active item is hidden we need to do
// layout.
if ((toVisible && !item._isActive) || (!toVisible && item._isActive)) {
needsLayout = true;
}
// If inactive item is shown we also need to do a little hack to make the
// item not animate it's next positioning (layout).
item._layout._skipNextAnimation = !!(toVisible && !item._isActive);
// If a hidden item is being shown we need to refresh the item's
// dimensions.
if (toVisible && item._visibility._isHidden) {
hiddenItems.push(item);
}
// Add item to layout or remove it from layout.
if (toVisible) {
item._addToLayout();
} else {
item._removeFromLayout();
}
}
// Force refresh the dimensions of all hidden items.
if (hiddenItems.length) {
this.refreshItems(hiddenItems, true);
hiddenItems.length = 0;
}
// Show the items in sync with the next layout.
function triggerVisibilityChange() {
if (needsLayout && opts.syncWithLayout !== false) {
grid.off(EVENT_LAYOUT_START, triggerVisibilityChange);
}
if (grid._hasListeners(startEvent)) {
grid._emit(startEvent, targetItems.slice(0));
}
for (i = 0; i < targetItems.length; i++) {
// Make sure the item is still in the original grid. There is a chance
// that the item starts migrating before tiggerVisibilityChange is called.
if (targetItems[i]._gridId !== grid._id) {
if (--counter < 1) {
if (isFunction(callback)) callback(completedItems.slice(0));
if (grid._hasListeners(endEvent)) grid._emit(endEvent, completedItems.slice(0));
}
continue;
}
targetItems[i]._visibility[method](isInstant, function (interrupted, item) {
// If the current item's animation was not interrupted add it to the
// completedItems array.
if (!interrupted) completedItems.push(item);
// If all items have finished their animations call the callback
// and emit showEnd/hideEnd event.
if (--counter < 1) {
if (isFunction(callback)) callback(completedItems.slice(0));
if (grid._hasListeners(endEvent)) grid._emit(endEvent, completedItems.slice(0));
}
});
}
}
// Trigger the visibility change, either async with layout or instantly.
if (needsLayout && opts.syncWithLayout !== false) {
this.on(EVENT_LAYOUT_START, triggerVisibilityChange);
} else {
triggerVisibilityChange();
}
// Trigger layout if needed.
if (needsLayout && layout) {
this.layout(layout === INSTANT_LAYOUT, isFunction(layout) ? layout : undefined);
}
};
/**
* Private helpers
* ***************
*/
/**
* Merge default settings with user settings. The returned object is a new
* object with merged values. The merging is a deep merge meaning that all
* objects and arrays within the provided settings objects will be also merged
* so that modifying the values of the settings object will have no effect on
* the returned object.
*
* @param {Object} defaultSettings
* @param {Object} [userSettings]
* @returns {Object} Returns a new object.
*/
function mergeSettings(defaultSettings, userSettings) {
// Create a fresh copy of default settings.
var settings = mergeObjects({}, defaultSettings);
// Merge user settings to default settings.
if (userSettings) {
settings = mergeObjects(settings, userSettings);
}
// Handle visible/hidden styles manually so that the whole object is
// overridden instead of the props.
if (userSettings && userSettings.visibleStyles) {
settings.visibleStyles = userSettings.visibleStyles;
} else if (defaultSettings && defaultSettings.visibleStyles) {
settings.visibleStyles = defaultSettings.visibleStyles;
}
if (userSettings && userSettings.hiddenStyles) {
settings.hiddenStyles = userSettings.hiddenStyles;
} else if (defaultSettings && defaultSettings.hiddenStyles) {
settings.hiddenStyles = defaultSettings.hiddenStyles;
}
return settings;
}
/**
* Merge two objects recursively (deep merge). The source object's properties
* are merged to the target object.
*
* @param {Object} target
* - The target object.
* @param {Object} source
* - The source object.
* @returns {Object} Returns the target object.
*/
function mergeObjects(target, source) {
var sourceKeys = Object.keys(source);
var length = sourceKeys.length;
var isSourceObject;
var propName;
var i;
for (i = 0; i < length; i++) {
propName = sourceKeys[i];
isSourceObject = isPlainObject(source[propName]);
// If target and source values are both objects, merge the objects and
// assign the merged value to the target property.
if (isPlainObject(target[propName]) && isSourceObject) {
target[propName] = mergeObjects(mergeObjects({}, target[propName]), source[propName]);
continue;
}
// If source's value is object and target's is not let's clone the object as
// the target's value.
if (isSourceObject) {
target[propName] = mergeObjects({}, source[propName]);
continue;
}
// If source's value is an array let's clone the array as the target's
// value.
if (Array.isArray(source[propName])) {
target[propName] = source[propName].slice(0);
continue;
}
// In all other cases let's just directly assign the source's value as the
// target's value.
target[propName] = source[propName];
}
return target;
}
/**
* Collect and return initial items for grid.
*
* @param {HTMLElement} gridElement
* @param {?(HTMLElement[]|NodeList|HtmlCollection|String)} elements
* @returns {(HTMLElement[]|NodeList|HtmlCollection)}
*/
function getInitialGridElements(gridElement, elements) {
// If we have a wildcard selector let's return all the children.
if (elements === '*') {
return gridElement.children;
}
// If we have some more specific selector, let's filter the elements.
if (typeof elements === STRING_TYPE) {
var result = [];
var children = gridElement.children;
for (var i = 0; i < children.length; i++) {
if (elementMatches(children[i], elements)) {
result.push(children[i]);
}
}
return result;
}
// If we have an array of elements or a node list.
if (Array.isArray(elements) || isNodeList(elements)) {
return elements;
}
// Otherwise just return an empty array.
return [];
}
/**
* Bind grid's resize handler to window.
*
* @param {Grid} grid
* @param {(Number|Boolean)} delay
*/
function bindLayoutOnResize(grid, delay) {
if (typeof delay !== NUMBER_TYPE) {
delay = delay === true ? 0 : -1;
}
if (delay >= 0) {
grid._resizeHandler = debounce(function () {
grid.refreshItems().layout();
}, delay);
window.addEventListener('resize', grid._resizeHandler);
}
}
/**
* Unbind grid's resize handler from window.
*
* @param {Grid} grid
*/
function unbindLayoutOnResize(grid) {
if (grid._resizeHandler) {
grid._resizeHandler(true);
window.removeEventListener('resize', grid._resizeHandler);
grid._resizeHandler = null;
}
}
/**
* Normalize style declaration object, returns a normalized (new) styles object
* (prefixed properties and invalid properties removed).
*
* @param {Object} styles
* @returns {Object}
*/
function normalizeStyles(styles) {
var normalized = {};
var docElemStyle = document.documentElement.style;
var prop, prefixedProp;
// Normalize visible styles (prefix and remove invalid).
for (prop in styles) {
if (!styles[prop]) continue;
prefixedProp = getPrefixedPropName(docElemStyle, prop);
if (!prefixedProp) continue;
normalized[prefixedProp] = styles[prop];
}
return normalized;
}
/**
* Create index map from items.
*
* @param {Item[]} items
* @returns {Object}
*/
function createIndexMap(items) {
var result = {};
for (var i = 0; i < items.length; i++) {
result[items[i]._id] = i;
}
return result;
}
/**
* Sort comparer function for items' index map.
*
* @param {Object} indexMap
* @param {Item} itemA
* @param {Item} itemB
* @returns {Number}
*/
function compareIndexMap(indexMap, itemA, itemB) {
var indexA = indexMap[itemA._id];
var indexB = indexMap[itemB._id];
return indexA - indexB;
}
return Grid;
})));