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jquery.observable.js
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jquery.observable.js
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/*
* Copyright (c) 2014, Bence Erős (ebence88@gmail.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*/
(function($) {
"use strict";
var getEventListeners = function( data, event ) {
var metadata = data.__observable;
if (metadata.eventlisteners === undefined) {
metadata.eventlisteners = {
'change': []
};
}
if ( event === undefined ) {
return metadata.eventlisteners;
}
if ( metadata.eventlisteners[event] === undefined ) {
metadata.eventlisteners[event] = [];
}
return metadata.eventlisteners[event];
};
var fireEvent = function(data, event, params) {
var listeners = getEventListeners(data, event);
// listeners.length can change during the iteration, since
// the event handlers can add new event handlers for the fired event.
// we don't want to run the event handlers which have been added after
// the event occured (ie. which has been added after the iteration has been started)
// therefore we save the current number of listeners to a local variable
// before starting the iteration
var listenerCount = listeners.length;
for ( var i = 0; i < listenerCount; ++i ) {
var listener = listeners[i];
if (listener === undefined)
continue;
// listener.isRunning is a flag/lock to avoid infinite recursions (eg. when the data is modified
// by the listener function, then the same listener won't be called again
if ( ! listener.isRunning ) {
listener.isRunning = true;
listener.fn.apply(data, params);
listener.isRunning = false;
}
}
};
// this function will be the on() method of all wrappers
var listenerAdder = function(event, listener) {
if ( $.isArray( event ) ) {
var rval = [];
for ( var i = 0; i < event.length; ++i ) {
rval.push( this.on( event[ i ], listener ) );
}
return rval;
}
var listeners = getEventListeners(this, event);
var rval = listeners.length;
listeners.push({
fn: listener
});
return rval;
};
var listenerRemover = function(event, listenerID) {
var listeners = getEventListeners(this, event);
if (listeners[listenerID] !== undefined) {
listeners[listenerID] = undefined;
}
};
var listenerCount = function(event) {
var eventListeners = getEventListeners(this, event);
var rval = 0;
for (var i = 0; i < eventListeners.length; ++i) {
if ( eventListeners[i] ){
++rval;
}
}
return rval;
}
var createObservableObject = function(value) {
if ( $.isPlainObject(value) ) {
for ( var i in value ) {
if (value.hasOwnProperty( i )) {
value[ i ] = $.observable( value[ i ] );
}
}
}
var observable = function observableObject() {
if (arguments.length === 0) { // getter
return value;
} else { // setter
var oldVal = $.observable.remove(observable);
value = arguments[ 0 ];
var isObservable = ($.isFunction( value )
&& value.__observable !== undefined );
if (isObservable) {
value = value();
}
if ( $.isPlainObject( value ) ) {
for (var i in value) {
if (value.hasOwnProperty( i )) {
value[ i ] = $.observable( value[ i ] );
}
}
}
fireEvent( observable, 'change', [observable, oldVal] );
}
};
observable.__observable = {};
observable.on = listenerAdder;
observable.off = listenerRemover;
observable.listenerCount = listenerCount;
return observable;
};
var observableArrayItems = function(arr) {
for (var i = 0; i < arr.length; ++i) {
arr[ i ] = $.observable(arr[ i ]);
}
return arr;
};
var createObservableArray = function(arr) {
var observable = function() {
var oldVal, newVal;
switch (arguments.length) {
case 0:
return arr;
case 1:
var arg = arguments[0];
if ( $.isArray( arg ) ) {
oldVal = $.observable.remove(arr);
arr = observableArrayItems( arg );
fireEvent(observable, 'change', [arr, oldVal ]);
} else {
return arr[ arg ];
}
break;
case 2:
oldVal = $.observable.remove( arr[ arguments[0] ] );
arr[ arguments[0] ] = newVal = $.observable( arguments[1] );
fireEvent(observable, 'elemchange', [arguments[0], newVal, oldVal]);
break;
default:
throw "must be called with 1 or 2 arguments, not " + arguments.length;
}
};
arr = observableArrayItems( arr );
observable.__observable = {};
observable.on = listenerAdder;
observable.push = function(newItem) {
newItem = $.observable(newItem);
arr.push( newItem );
fireEvent( this, 'push', [newItem] );
};
observable.forEach = function( callback ) {
for ( var i = 0; i < arr.length; ++i ) {
if ( callback.call( null, i, arr[i] ) === false ) {
break;
}
}
};
observable.size = function() {
return arr.length;
};
observable.pop = function() {
var rval = arr.pop();
fireEvent( this, 'pop', [rval] );
return rval;
};
observable.reverse = function() {
arr.reverse();
fireEvent( this, 'reverse', [] );
};
observable.shift = function() {
var rval = arr.shift();
fireEvent( this, 'shift', [rval] );
return rval;
};
observable.sort = function( callback ) {
if ( callback ) {
if ( ! $.isFunction( callback )) {
throw "ArrayWrapper.sort() can only accept function parameter";
}
} else {
callback = function(a, b) { // a default callback with lexicographical ordering.
a = a.toString();
b = b.toString();
if (a === b) {
return 0;
} else if (a < b) {
return -1;
}
return 1;
};
}
var comparator = function(a, b) {
return callback($.observable.remove( a ),
$.observable.remove( b )); // unwrapping the items before passing them to the callback
};
return arr.sort(comparator);
};
observable.unshift = function(elem) {
elem = $.observable( elem );
arr.unshift( elem );
fireEvent(this, 'unshift', [elem] );
};
return observable;
};
$.observable = function(data) {
if ( $.isArray(data) ) {
return createObservableArray( data );
}
if ( $.isFunction(data) && data.__observable ) {
return data;
}
return createObservableObject( data );
};
$.observable.remove = function(data) {
var rval = [], i;
if ( ! $.isFunction(data)) {
if ( $.isArray(data) ) {
for ( i = 0; i < data.length; ++i ) {
rval[ i ] = $.observable.remove( data[ i ] );
}
}
return rval;
}
var rawData = data(); // getting the raw object
if ( $.isArray(rawData) ) {
for( i = 0; i < rawData.length; ++i ) {
rval[ i ] = $.observable.remove( rawData[ i ] );
}
return rval;
} else if ($.isPlainObject( rawData ) ) {
rval = {};
for ( var prop in rawData ) {
if (rawData.hasOwnProperty(prop)) {
rval[ prop ] = $.observable.remove( rawData[ prop ] );
}
}
return rval;
}
return rawData;
};
})(jQuery);