air 禁止F4+Alt退出

//原理 其实就是侦听关闭命令  

import flash.display.InteractiveObject;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;

import flash.desktop.NativeApplication;

//全屏
//stage.displayState = StageDisplayState.FULL_SCREEN_INTERACTIVE;

var key_obj = {};
var ib2 = this.stage.nativeWindow; //希望屏蔽alt键的对象
var ib = this.stage; //希望屏蔽alt键的对象

addKeyBoardEven(true);
function addKeyBoardEven(_isAdd) {
	if (_isAdd) {
		ib.addEventListener(KeyboardEvent.KEY_UP, onKeyUpHandler);
		ib.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDownHandler);
		ib2.addEventListener (Event.CLOSING,closing);
	} else {
		ib.removeEventListener(KeyboardEvent.KEY_UP, onKeyUpHandler);
		ib.removeEventListener(KeyboardEvent.KEY_DOWN, onKeyDownHandler);
		ib2.removeEventListener (Event.CLOSING,closing);
	}
}

function closing(_evt){
	trace("使对ib对象按下的alt键无效");
	_evt.preventDefault();
}

function onKeyDownHandler(_evt: KeyboardEvent): void {
	
	var _code = (_evt.keyCode).toString();
	key_obj[_code] = true;

	if (key_obj["115"] && key_obj["18"] == true) {
		
		 NativeApplication.nativeApplication.exit();
		return;
	}
}

function onKeyUpHandler(_evt: KeyboardEvent): void {
	var _code = (_evt.keyCode);
	key_obj[_code.toString()] = false;
}