/**
* ObservableObject.js
*
* Released under LGPL License.
* Copyright (c) 1999-2015 Ephox Corp. All rights reserved
*
* License: http://www.tinymce.com/license
* Contributing: http://www.tinymce.com/contributing
*/
/**
* This class is a object that is observable when properties changes a change event gets emitted.
*
* @private
* @class tinymce.data.ObservableObject
*/
define("tinymce/data/ObservableObject", [
"tinymce/data/Binding",
"tinymce/util/Observable",
"tinymce/util/Class",
"tinymce/util/Tools"
], function(Binding, Observable, Class, Tools) {
function isNode(node) {
return node.nodeType > 0;
}
// Todo: Maybe this should be shallow compare since it might be huge object references
function isEqual(a, b) {
var k, checked;
// Strict equals
if (a === b) {
return true;
}
// Compare null
if (a === null || b === null) {
return a === b;
}
// Compare number, boolean, string, undefined
if (typeof a !== "object" || typeof b !== "object") {
return a === b;
}
// Compare arrays
if (Tools.isArray(b)) {
if (a.length !== b.length) {
return false;
}
k = a.length;
while (k--) {
if (!isEqual(a[k], b[k])) {
return false;
}
}
}
// Shallow compare nodes
if (isNode(a) || isNode(b)) {
return a === b;
}
// Compare objects
checked = {};
for (k in b) {
if (!isEqual(a[k], b[k])) {
return false;
}
checked[k] = true;
}
for (k in a) {
if (!checked[k] && !isEqual(a[k], b[k])) {
return false;
}
}
return true;
}
return Class.extend({
Mixins: [Observable],
/**
* Constructs a new observable object instance.
*
* @constructor
* @param {Object} data Initial data for the object.
*/
init: function(data) {
var name, value;
data = data || {};
for (name in data) {
value = data[name];
if (value instanceof Binding) {
data[name] = value.create(this, name);
}
}
this.data = data;
},
/**
* Sets a property on the value this will call
* observers if the value is a change from the current value.
*
* @method set
* @param {String/object} name Name of the property to set or a object of items to set.
* @param {Object} value Value to set for the property.
* @return {tinymce.data.ObservableObject} Observable object instance.
*/
set: function(name, value) {
var key, args, oldValue = this.data[name];
if (value instanceof Binding) {
value = value.create(this, name);
}
if (typeof name === "object") {
for (key in name) {
this.set(key, name[key]);
}
return this;
}
if (!isEqual(oldValue, value)) {
this.data[name] = value;
args = {
target: this,
name: name,
value: value,
oldValue: oldValue
};
this.fire('change:' + name, args);
this.fire('change', args);
}
return this;
},
/**
* Gets a property by name.
*
* @method get
* @param {String} name Name of the property to get.
* @return {Object} Object value of propery.
*/
get: function(name) {
return this.data[name];
},
/**
* Returns true/false if the specified property exists.
*
* @method has
* @param {String} name Name of the property to check for.
* @return {Boolean} true/false if the item exists.
*/
has: function(name) {
return name in this.data;
},
/**
* Returns a dynamic property binding for the specified property name. This makes
* it possible to sync the state of two properties in two ObservableObject instances.
*
* @method bind
* @param {String} name Name of the property to sync with the property it's inserted to.
* @return {tinymce.data.Binding} Data binding instance.
*/
bind: function(name) {
return Binding.create(this, name);
},
/**
* Destroys the observable object and fires the "destroy"
* event and clean up any internal resources.
*
* @method destroy
*/
destroy: function() {
this.fire('destroy');
}
});
});
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