define(['../on', '../_base/window', '../dom-construct', '../domReady!'], function(on, baseWin, domConstruct){
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// summary:
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// This sub module provide an event factory for delayed events (like debounce or throttle)
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// module:
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// dojo/on/asyncEventListener
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//Testing is the browser support async event access
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//If not we need to clone the event, otherwise accessing the event properties
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//will trigger a JS error (invalid member)
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var testNode = domConstruct.create('div', null, baseWin.body()),
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testEvent,
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requiresClone;
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on.once(testNode, 'click', function(e){
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testEvent = e;
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});
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testNode.click();
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try{
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requiresClone = testEvent.clientX === undefined;
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}catch(e){
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requiresClone = true;
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}finally{
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domConstruct.destroy(testNode);
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}
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function clone(arg){
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// summary:
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// clone the event
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// description:
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// Used if the browser provides a corrupted event (comming from a node) when passed to an async function
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var argCopy = {},
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i;
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for(i in arg){
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argCopy[i] = arg[i];
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}
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return argCopy;
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}
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return function(listener){
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if(requiresClone){
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return function(e){
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//lang.clone fail to clone events, so we use a custom function
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listener.call(this, clone(e));
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};
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}
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return listener;
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};
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});
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