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Shan's Simple Examples: Keyboard shortcuts and TextInput

Posted At : March 6, 2008 1:58 PM | Posted By : Shannon Hicks
Related Categories: Flex & Flash, Shan's Simple Examples

Someone on #flex asked about preventing text from appearing in a TextInput or TextArea, when the user is using a keyboard shortcut. After a little discussion, I came up with a working example. I decided to use shift-space to simplify things.

The first assumption is that you're listening for keyboard shortcuts at the application level:

application.addEventListener(KeyboardEvent.KEY_UP,shortcutHandler);

Now, you've got your input box, and it's listeners:

<mx:TextArea height="100%" width="95%" keyDown="shortcutPreprocess(event)" textInput="shortcutPreventer(event)"/>
private function shortcutPreprocess(e:KeyboardEvent):void {
   if (e.shiftKey && e.keyCode == 32) {
   _isShiftSpace = true;
} else {
   _isShiftSpace = false;
}
}

private function shortcutPreventer(e:Event):void {
   if (_isShiftSpace) {
      e.stopImmediatePropagation();
      e.preventDefault();
   }
}

Note that I had to set a boolean in my shortcutPreprocess method, and then I check for the boolean in shortcutPreventer. The reason being is that the textInput event doesn't pass in the KeyboardEvent in any way, so I don't know if there was a key combo pressed.

Working example & source: http://www.iotashan.com/examples/KeyboardShortcut/

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