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Class.js
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Class.js
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define(['jidejs/base/Util', 'jidejs/base/ObservableProperty'], function(_, ObservableProperty) {
function Type() {
}
Type.prototype.name = '';
Type.prototype.init = function(instance) {};
Type.prototype.setup = function(instance) {};
Type.prototype.dispose = function(instance) {};
function Property(config) {
if(!(this instanceof Property)) {
return new Property(config);
}
this.name = config.name || '';
this.initivalValue = config.value || null;
this.converter = config.converter || null;
this.bubbles = config.bubbles || false;
this.cancelable = typeof config.cancelable !== 'undefined' ? config.cancelable : true;
}
Property.prototype = Object.create(Type.prototype);
Property.prototype.constructor = Property;
Property.prototype.setup = function(proto) {
var name = this.name;
Object.defineProperty(proto, name, {
get: function() {
return this[name+'Property'].get();
},
set: function(value) {
this[name+'Property'].set(value);
},
enumerable: true, configurable: true
});
};
Property.prototype.init = function(instance) {
var name = this.name;
instance[name+'Property'] = new ObservableProperty(
instance, name, this.initialValue, this.converter, this.bubbles, this.cancelable
);
};
Property.prototype.dispose = function(instance) {
instance[this.name+'Property'].dispose();
};
/**
* Creates a new constructor function from the given definition object.
*
* @param {Object} definition The class definition
* @param {Object|Function?} definition.$extends The prototype from which the new class inherits.
* If a function is given, its prototype is used.
* @param {Array<Object>?} definition.$with An Array of objects that should be mixed in with this class.
* @param {Function?} definition.$init The constructor function of the class
* @param {Function?} definition.dispose The dispose implementation
* @return {Function}
*/
function Class(definition) {
var $extends = definition.$extends || Object,
$with = definition.$with || [],
$init = definition.$init,
dispose = definition.dispose,
properties = [];
if(_.isFunction($extends)) {
$extends = $extends.prototype || Object;
}
function Class() {
for(i = 0, len = properties.length; i < len; i++) {
properties[i].init(this, arguments);
}
$init.apply(this, arguments);
}
Class.prototype = Object.create($extends);
for(var i = 0, len = $with.length; i < len; i++) {
mixin(Class.prototype, $with[i]);
}
Object.getOwnPropertyNames(definition).forEach(function(propertyName) {
// ignore the $extends and $with properties
if(propertyName === '$extends' || propertyName === '$with' || propertyName === '$init' || propertyName === 'dispose') return;
var descriptor = Object.getOwnPropertyDescriptor(definition, propertyName);
if(descriptor.value) {
if(descriptor.value === Property) {
properties.push(new Property({name: propertyName}));
} else if(descriptor.value instanceof Type) {
descriptor.value.name = propertyName;
properties.push(descriptor.value);
} else {
descriptor.configurable = true; // explicitly make the property configurable so that it can be overriden
Object.defineProperty(Class.prototype, propertyName, descriptor);
}
} else {
descriptor.configurable = true; // explicitly make the property configurable so that it can be overriden
Object.defineProperty(Class.prototype, propertyName, descriptor);
}
});
for(i = 0, len = properties.length; i < len; i++) {
properties[i].setup(Class.prototype);
}
Class.prototype.dispose = function() {
for(i = 0, len = properties.length; i < len; i++) {
properties[i].dispose(this);
}
if(dispose) dispose.call(this);
else if($extends.dispose) $extends.dispose.call(this);
};
Class.prototype.constructor = Class;
return Class;
}
Class.Type = Type;
Class.Property = Property;
function mixin(target, mixin) {
var copyTarget = target;
if(_.isFunction(copyTarget)) {
copyTarget = target.prototype;
}
for(var i = 0, len = arguments.length; i < len; i++) {
mixin = arguments[i];
if(_.isFunction(mixin)) {
mixin = mixin.prototype;
}
Object.getOwnPropertyNames(mixin).forEach(function(name) {
if(!(name in copyTarget)) {
var desc = Object.getOwnPropertyDescriptor(mixin, name);
Object.defineProperty(copyTarget, name, desc);
}
});
}
return this;
}
return Class;
});