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60 lines
2.0 KiB
JavaScript
60 lines
2.0 KiB
JavaScript
12 years ago
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define("dijit/Destroyable", [
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"dojo/_base/array", // array.forEach array.map
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"dojo/aspect",
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"dojo/_base/declare"
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], function(array, aspect, declare){
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// module:
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// dijit/Destroyable
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return declare("dijit.Destroyable", null, {
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// summary:
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// Mixin to track handles and release them when instance is destroyed.
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// description:
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// Call this.own(...) on list of handles (returned from dojo/aspect, dojo/on,
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// dojo/Stateful::watch, or any class (including widgets) with a destroyRecursive() or destroy() method.
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// Then call destroy() later to destroy this instance and release the resources.
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destroy: function(/*Boolean*/ preserveDom){
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// summary:
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// Destroy this class, releasing any resources registered via own().
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this._destroyed = true;
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},
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own: function(){
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// summary:
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// Track specified handles and remove/destroy them when this instance is destroyed, unless they were
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// already removed/destroyed manually.
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// tags:
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// protected
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// returns:
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// The array of specified handles, so you can do for example:
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// | var handle = this.own(on(...))[0];
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array.forEach(arguments, function(handle){
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var destroyMethodName =
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"destroyRecursive" in handle ? "destroyRecursive" : // remove "destroyRecursive" for 2.0
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"destroy" in handle ? "destroy" :
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"remove";
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// When this.destroy() is called, destroy handle. Since I'm using aspect.before(),
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// the handle will be destroyed before a subclass's destroy() method starts running, before it calls
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// this.inherited() or even if it doesn't call this.inherited() at all. If that's an issue, make an
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// onDestroy() method and connect to that instead.
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var odh = aspect.before(this, "destroy", function(preserveDom){
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handle[destroyMethodName](preserveDom);
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});
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// If handle is destroyed manually before this.destroy() is called, remove the listener set directly above.
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var hdh = aspect.after(handle, destroyMethodName, function(){
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odh.remove();
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hdh.remove();
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}, true);
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}, this);
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return arguments; // handle
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}
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});
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});
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