Flex Canvas keyboard event handling
In the attached code sample, keyboard events just don't work.
The control never reaches handleKeyDown, no matter which key I press.<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Canvas creationComplete="initIt()" id="can1">
<mx:Label text="it's here" y="2000"/>
</mx:Canvas>
<mx:Script>
<![CDATA[
private function initIt():void {
can1.addEventListener(KeyboardEvent.KEY_DOWN,handleKeyDown);
}
private function handleKeyDown(e:KeyboardEvent):void {
if(e.keyCode == Keyboard.UP) {
trace("up");
verticalScrollPosition++;
}
if(e.keyCode == Keyboard.DOWN) {
trace("down");
verticalScro开发者_StackOverflow社区llPosition--;
}
}
]]>
</mx:Script>
</mx:Application>
The reason for that is that normally a Canvas doesn't have focus. Without focus there normally are no keyboard events. Thake a look at "Problem with handling keyboard events inside a Canvas using Flex." for a possible solution.
try to switch focus manually in initIt() function
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