键盘侦听器的综合应用

Stage.scaleMode = "noScale";
// 在根影片深度为1处创建一个空 MC
var container:MovieClip = this.createEmptyMovieClip("container", 1);
// 新建存放 MC 列表的数组
var mcList:Array = new Array();
// 函数新增影片
function addingMC()
{
// 取得 container 深度 + 1
var depthNum:Number = container.getNextHighestDepth();
// 添加当前mc
var current_mc:MovieClip = container.attachMovie("mc", "my_mc" + depthNum, depthNum, {_x:random(600), _y:random(400)});
// 压入堆栈
mcList.push(current_mc);
// 设置编号
current_mc.number_txt.text = depthNum;
// 设置按钮事件
current_mc.new_btn.onPress = addingMC;
// :TRICK: 设置背景托板鼠标事件
current_mc.board_mc.onPress = function()
{
// :TRICK: 整体 MC 开始拖拽
current_mc.startDrag(false, 0, 0, 600, 400);
};
current_mc.board_mc.onRelease = function()
{
current_mc.stopDrag();
};
// 修改前一 mc 的属性
if (depthNum > 0)
{
// 前一mc
var previous_mc:MovieClip = mcList[mcList.length - 2];
// 移除侦听器
Key.removeListener(previous_mc);
// 设置 _alpha 属性
previous_mc._alpha = 50;
// 按钮失效
previous_mc.new_btn.enabled = false;
}
// onKeyUp 与 Key.getCode() 联合使用可以检测到 Esc 键
current_mc.onKeyUp = function()
{
//trace(Key.getCode());
if (Key.getCode() == 27)
{
//trace(this);
//trace(this.getDepth());
var depthNum:Number = this.getDepth();
if (depthNum > 1)
{
// 前一mc
var previous_mc:MovieClip = mcList[mcList.length - 2];
// 添加侦听器
Key.addListener(previous_mc);
// 设置 _alpha 属性
previous_mc._alpha = 100;
// 按钮恢复
previous_mc.new_btn.enabled = true;
}
else if (depthNum == 1)
{
// 前一mc
var previous_mc:MovieClip = mcList[mcList.length - 2];
// 设置 _alpha 属性
previous_mc._alpha = 100;
// 按钮恢复
previous_mc.new_btn.enabled = true;
}
this.removeMovieClip();
// 弹出堆栈
mcList.pop();
//trace(mcList.length);
updateAfterEvent();
}
};
Key.addListener(current_mc);
}
addingMC();