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/* <copyright>
This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
(c) Copyright 2011 Motorola Mobility, Inc. All Rights Reserved.
</copyright> */
/**
@module montage/core/event/mutable-event
@requires montage
*/
var Montage = require("montage").Montage;
// XXX Does not presently function server-side
if (typeof window !== "undefined") {
var _eventConstructorsByType = {};
var nullDescriptor = {value: null};
var wrapProperty = function(obj, key) {
var storageKey = "_" + key;
Montage.defineProperty(obj, storageKey, {value: undefined});
Montage.defineProperty(obj, key, {
get:(function(key, storageKey) {
return function() {
return this.hasOwnProperty(storageKey) ? this[storageKey] : (this._event ? this._event[key] : undefined);
};
})(key, storageKey),
set: (function(storageKey) {
return function(value) {
this[storageKey] = value;
};
})(storageKey)
});
};
/**
@class module:montage/core/event/mutable-event.MutableEvent
*/
var MutableEvent = exports.MutableEvent = Montage.create(Montage,/** @lends module:montage/core/event/mutable-event.MutableEvent# */ {
/**
@function
@param {Event} event The original event.
@returns newEvent
*/
fromEvent: {
value: function(event) {
var type = event.type,
constructor = _eventConstructorsByType[type],
newEvent;
if (!constructor) {
constructor = function() {
};
constructor.prototype = MutableEvent.create()._initPrototypeWithEvent(event);
_eventConstructorsByType[type] = constructor;
}
newEvent = new constructor();
newEvent._initWithEvent(event);
return newEvent;
}
},
// Same arguments as initEvent & initCustomEvent
/**
@function
@param {Event} type TODO
@param {Event} canBubbleArg TODO
@param {Event} cancelableArg TODO
@param {Event} data TODO
@returns this.fromEvent(anEvent)
*/
fromType: {
value: function(type, canBubbleArg, cancelableArg, data) {
var anEvent = document.createEvent("CustomEvent");
anEvent.initEvent(type, canBubbleArg, cancelableArg, data);
return this.fromEvent(anEvent);
}
},
/**
@private
*/
_initPrototypeWithEvent: {
value: function(event) {
var key;
for (key in event) {
// Don't overwrite keys we have installed
if (this[key]) {
continue;
}
// Skip methods, the ones we care about have been wrapped already
// TODO actually wrap all known functions generically
//if (typeof this[key] === "function") {
// continue;
//}
// TODO ok, maybe it would be quicker to not make this a function, but I really hate duplicated code
wrapProperty(this, key);
}
wrapProperty(this, "replayed");
return this;
}
},
/**
@private
*/
_initWithEvent: {
value: function(event) {
this._event = event;
return this;
}
},
/**
@function
*/
preventDefault: {
value: function() {
this._event.preventDefault();
}
},
/**
@function
*/
stopImmediatePropagation: {
value: function() {
this._event.stopImmediatePropagation();
// TODO only if the event is cancellable?
this.propagationStopped = true;
}
},
/**
@type {Property}
@default {Boolean} false
*/
propagationStopped: {
value: false
},
/**
@type {Property}
@default {Boolean} true
*/
mutable: {
value: true
},
/**
@type {Property}
@default {Element} null
*/
target: {
value: null
},
/**
@function
*/
stopPropagation: {
value: function() {
this._event.stopPropagation();
// TODO only if the event is cancellable?
this.propagationStopped = true;
}
},
/**
@function
*/
stop: {
value: function() {
this.preventDefault();
this.stopPropagation();
}
}
});
} // client-side
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