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/**
* HistoryManager
*
* Observes back/forward button usage and saves states
* for registered modules into the hash. This allows to
* bookmark specific states for an application.
*
* @version 1.0rc2
*
* @see Events, Options
*
* @license MIT License
* @author Harald Kirschner <mail [at] digitarald.de>
* @copyright 2007 Author
*/
var HistoryManager = {
/**
* Default options - Can be overridden with setOptions
*
* observeDelay: Duration for checking the state, default 100ms
* stateSeparator: Seperator for module-state join, default ';'
* iframeSrc: Scr for IE6/7 iframe, must exist on server!
* onStart: Fires on start
* onRegister: Fires on register
* onUnregister: Fires on unregister
* onUpdate: Fires when state changes from ...
* onStateChange: ... module changes
* onObserverChange: ... history change
*/
options: {
observeDelay: 100,
stateSeparator: ';',
iframeSrc: 'blank.html',
onStart: Class.empty,
onRegister: Class.empty,
onUnregister: Class.empty,
onStart: Class.empty,
onUpdate: Class.empty,
onStateChange: Class.empty,
onObserverChange: Class.empty
},
/**
* Default options for register
*
* defaults: Default values array, initially empty.
* regexpParams: When regexp is a String, this is the second argument for new RegExp.
* skipDefaultMatch: default true; When true onGenerate is not called when current values are similar to the default values.
*/
dataOptions: {
skipDefaultMatch: true,
defaults: [],
regexpParams: ''
},
/**
* Constructur - Class.initialize
*
* Options:
* - observeDelay: duration in ms, default 100 - BackBuddy observe the hash for changes periodical
* - stateSeparator: char, default ';' - Separator for multiple module-states in the hash
* - iframeSrc: string, default 'blank.html' - File for the iframe (IE6/7), must exist on the server!
* - Events: onStart, onRegister, onStart, onUpdate, onStateChange, onObserverChange
*
* @return this
*
* @param {Object} options
*/
initialize: function(options) {
if (this.modules) return this;
this.setOptions(options);
this.modules = $H({});
this.count = history.length;
this.states = [];
this.states[this.count] = this.getHash();
this.state = null;
return this;
},
/**
* Start - Check hash and start observer
*
* Call start after registering ALL modules. This start the observer,
* reads the state from the hash and calls onMatch for effected modules.
*
* @return this
*
*/
start: function() {
this.observe.periodical(this.options.observeDelay, this);
this.started = true;
this.observe();
this.update();
this.fireEvent('onStart', [this.state]);
return this;
},
/**
* Registers a module
*
* @return {Object} Object with shortcuts for setValues, setValue, generate and unregister
*
* @param {String} Module key
* @param {RegExp}/{String} Regular expression that matches the string updated from onGenerate
* @param {Function} Will be called when the regexp matches, with the new values as argument.
* @param {Function} Should return the string for the state string, values are first argument
* @param {Array} default values, the input values given to onMatch and onGenerate will be complemented with these
* @param {Object} (optional) options
*/
register: function(key, defaults, onMatch, onGenerate, regexp, options) {
if (!this.modules) this.initialize();
var data = $merge(this.dataOptions, options || {}, {
defaults: defaults,
onMatch: onMatch,
onGenerate: onGenerate,
regexp: regexp
});
data.regexp = data.regexp || key + '-([\\w_-]*)';
if (typeof data.regexp == 'string') data.regexp = new RegExp(data.regexp, data.regexpParams);
data.onGenerate = data.onGenerate || function(values) { return key + '-' + values[0]; };
data.values = data.defaults.copy();
this.modules.set(key, data);
this.fireEvent('onUnregister', [key, data]);
return {
setValues: function(values) {
return this.setValues(key, values);
}.bind(this),
setValue: function(index, value) {
return this.setValue(key, index, value);
}.bind(this),
generate: function(values) {
return this.generate(key, values);
}.bind(this),
unregister: function() {
return this.unregister(key);
}.bind(this)
};
},
/**
* unregister - Removes an module from the
*
* @param {String} Module key
*/
unregister: function(key) {
this.fireEvent('onRegister', [key]);
this.modules.remove(key);
},
/**
* setValues - Set all values new, updates new state
*
* @param {String} Module key
* @param {Object} Complete values
*/
setValues: function(key, values) {
var data = this.modules.get(key);
if (!data || data.values.isSimilar(values)) return this;
data.values = values;
this.update();
return this;
},
/**
* setValue - Set one value, updates new state
*
* @param {String} Module key
* @param {Number} Value index
* @param {Object} Value
*/
setValue: function(key, index, value) {
var data = this.modules.get(key);
if (!data || data.values[index] == value) return this;
data.values[index] = value;
this.update();
return this;
},
/**
* generate - Generates a hash from the given
*
* @param {String} Module key
* @param {Number} Value index
* @param {Object} Value
*/
generate: function(key, values) {
var data = this.modules.get(key);
var current = data.values.copy();
data.values = values;
var state = this.generateState();
data.values = current;
return '#' + state;
},
observe: function() {
if (this.timeout) return;
var state = this.getState();
if (this.state == state) return;
if ((window.ie || window.webkit419) && (this.state !== null)) this.setState(state, true);
else this.state = state;
this.modules.each(function(data, key) {
var bits = state.match(data.regexp);
if (bits) {
bits.splice(0, 1);
bits.complement(data.defaults);
if (!bits.isSimilar(data.defaults)) data.values = bits;
} else data.values = data.defaults.copy();
data.onMatch(data.values, data.defaults);
});
this.fireEvent('onStateChange', [state]).fireEvent('onObserverChange', [state]);
},
generateState: function() {
var state = [];
this.modules.each(function(data, key) {
if (data.skipDefaultMatch && data.values.isSimilar(data.defaults)) return;
state.push(data.onGenerate(data.values));
});
return state.join(this.options.stateSeparator);
},
update: function() {
if (!this.started) return this;
var state = this.generateState();
if ((!this.state && !state) || (this.state == state)) return this;
this.setState(state);
this.fireEvent('onStateChange', [state]).fireEvent('onUpdate', [state]);
return this;
},
observeTimeout: function() {
if (this.timeout) this.timeout = $clear(this.timeout);
else this.timeout = this.observeTimeout.delay(200, this);
},
getHash: function() {
var href = top.location.href;
var pos = href.indexOf('#') + 1;
return (pos) ? href.substr(pos) : '';
},
getState: function() {
var state = this.getHash();
if (this.iframe) {
var doc = this.iframe.contentWindow.document;
if (doc && doc.body.id == 'state') {
var istate = doc.body.innerText;
if (this.state == state) return istate;
this.istateOld = true;
} else return this.istate;
}
if (window.webkit419 && history.length != this.count) {
this.count = history.length;
return $pick(this.states[this.count - 1], state);
}
return state;
},
setState: function(state, fix) {
state = $pick(state, '');
if (window.webkit419) {
if (!this.form) this.form = new Element('form', {method: 'get'}).injectInside(document.body);
this.count = history.length;
this.states[this.count] = state;
this.observeTimeout();
this.form.setProperty('action', '#' + state).submit();
} else top.location.hash = state || '#';
if (window.ie && (!fix || this.istateOld)) {
if (!this.iframe) {
this.iframe = new Element('iframe', {
src: this.options.iframeSrc,
styles: 'visibility: hidden;'
}).injectInside(document.body);
this.istate = this.state;
}
try {
var doc = this.iframe.contentWindow.document;
doc.open();
doc.write('<html><body id="state">' + state + '</body></html>');
doc.close();
this.istateOld = false;
} catch(e) {};
}
this.state = state;
},
extend: $extend
};
HistoryManager.extend(Events.prototype);
HistoryManager.extend(Options.prototype);
/**
* Extends Array with 2 helpers: isSimilar(array) and complement(array)
*
*/
Array.extend({
/**
* isSimilar - Returns true for similar arrays, type-insensitive
*
* @example
* [1].isSimilar(['1']) == true
* [1, 2].isSimilar([1, false]) == false
*
* @return {Boolean}
* @param {Object} Array
*/
isSimilar: function(array) {
return (this.toString() == array.toString());
},
/**
* complement - Fills up empty array values from another array, length is the same
*
* @example
* [1, null].complement([3, 4]) == [1, 4]
* [undefined, '1'].complement([2, 3, 4]) == [2, '1']
* @return {Array} this
* @param {Object} Array
*/
complement: function(array) {
for (var i = 0, j = this.length; i < j; i++) this[i] = $pick(this[i], array[i] || null);
return this;
}
});