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Flash / Flex / ActionScript » Development » KeyboardEvent 
Up / Left Sensor
 

package {
  import flash.display.*;
  import flash.events.*;
  import flash.ui.*;

  public class Main extends Sprite {
    private var upPressed:Boolean;
    private var leftPressed:Boolean;

    public function Main (  ) {
      stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDownListener);
      stage.addEventListener(KeyboardEvent.KEY_UP, keyUpListener);
    }

    private function keyDownListener (e:KeyboardEvent):void {
      if (e.keyCode == Keyboard.UP) {
        upPressed = true;
      else if (e.keyCode == Keyboard.LEFT) {
        leftPressed = true;
      }

      if (upPressed && leftPressed) {
        trace("Up Arrow key and Left Arrow key are both pressed");
      }
    }

    private function keyUpListener (e:KeyboardEvent):void {
      if (e.keyCode == Keyboard.UP) {
        upPressed = false;
      else if (e.keyCode == Keyboard.LEFT) {
        leftPressed = false;
      }
    }
  }
}

        
Related examples in the same category
1.KeyboardEvent Basics
2.Understanding keyCodes
3.Listen for the keyDown event and traces out the character code for that key.
4.Handling keyboard events globally
5.Handling keyboard events for a particular object
6.Retrieving a pressed key's key code through KeyboardEvent.KEY_DOWN event
7.Reference key code with Keyboard.ESCAPE
8.Multilocation keys
9.Determining the Character Associated with a Key
10.Converting user input to uppercase
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