Question

所以基本上我有一个名为Jug的MovieClip，当点击鸡蛋并将其拖到Jug时，我希望它消失，然后在它首次启动的地方重新添加。除此之外，我想要一个变量在值中加1。

我已经尝试了一段时间摆弄它并且我无法弄清楚，因为当我删除孩子时它会出错。这是代码：

var eggClickOffset:Point = null;
var egg:Egg = new Egg();
egg.x = 290;
egg.y = 330;
addChild(egg);
var eggAmount:TextField = new TextField();
eggAmount.defaultTextFormat = textFormat;
eggAmount.x = 250;
eggAmount.y = 60;
eggAmount.height = 18;
eggAmount.width = 100;
eggAmount.border = true;
eggAmount.text = "Incorrect Amount";
eggAmount.background = true;
eggAmount.backgroundColor = 0xff0000;
stage.focus = eggAmount;
addChild(eggAmount);
var eggs:int;
eggs = 0;

//Egg Event listeners:
egg.addEventListener(Event.ENTER_FRAME, eggAmountCounter);
egg.addEventListener(MouseEvent.MOUSE_DOWN, startEggDrag);
egg.addEventListener(MouseEvent.MOUSE_UP, stopEggDrag);
egg.addEventListener(Event.ENTER_FRAME, dragEgg);
egg.addEventListener(Event.ENTER_FRAME, checkEggCollision);

//starting egg drag:
function startEggDrag(event:MouseEvent):void
{
    eggClickOffset = new Point(event.localX,event.localY);
}

//Stopping the egg drag:
function stopEggDrag(event:MouseEvent):void
{
    eggClickOffset = null;
}

//Egg Dragging:
function dragEgg(event:Event):void
{
    if (eggClickOffset != null)
    {// must be dragging
        egg.x = mouseX - eggClickOffset.x;
        egg.y = mouseY - eggClickOffset.y;
    }
}

//When egg hits jug:
function checkEggCollision(event:Event):void
{
    if (jug.hitTestObject(egg))
    {
            eggs + 1;
            egg.removeEventListener(MouseEvent.MOUSE_DOWN, startEggDrag);
            egg.removeEventListener(Event.ENTER_FRAME, dragEgg);
            removeChild(egg);
            addChild(egg);
            egg.x = 300;
            egg.y = 300;
    }
}

//How many eggs:
function eggAmountCounter(event:Event):void {
    if(eggs == 3){
        eggAmount.text = "Corrent Amount";
    }
}

Answer 1

因此，就工具包重绘自身所需的内容而言，从容器中添加和删除内容实际上非常昂贵。并且通常会出现这样的问题，即您所遇到的问题与广告宣传不同。因此，当您想要控制可见性时，我的建议是永远不会添加/删除组件。只需将它们标记为visible = false / true，并可选择记住使用includeInLayout = true / false。由于你有影片剪辑，因此= true / false应该足够好。

如果你只想让鸡蛋重新回到原来的位置，只需直接修改它的x，y位置即可。我创建了一个简单的方法，它接收一个egg并设置初始状态的所有属性。在你的stopEggDrag方法中，只需调用该函数传递屏幕上正在吸毒的蛋。 Viola它会回到原来的位置。

这里的诀窍是，如果你永远不删除对象，就不必解决删除问题。

Answer 2

抱歉，我在removeChild上没有错误，但我暗示不能再移动蛋了，因为：

egg.removeEventListener(MouseEvent.MOUSE_DOWN, startEggDrag);

顺便说一下，我确定在这种情况下你不需要3x Event.ENTER_FRAME。

我建议你采用不同的方法吗？也许你可以尝试更像这样的东西：

var eggStartPos:Point;
egg.addEventListener(MouseEvent.MOUSE_DOWN, startEggDrag);
egg.addEventListener(MouseEvent.MOUSE_UP, stopEggDrag);

//starting egg drag:
function startEggDrag(event:MouseEvent):void
{
    eggStartPos = new Point(egg.x, egg.y);
    egg.addEventListener(Event.ENTER_FRAME, handle_enterFrame);
}

//Stopping the egg drag:
function stopEggDrag(event:MouseEvent):void
{
    egg.removeEventListener(Event.ENTER_FRAME, handle_enterFrame);
    eggStartPos = null;
}

//Handle egg moving and hittest on enter frame
function handle_enterFrame(event:Event):void
{
    egg.x = mouseX;
    egg.y = mouseY;

    if( collisionWithJug(egg) )
    {
        egg.removeEventListener(Event.ENTER_FRAME, handle_enterFrame);
        collisionOccur();
    }
}

function collisionWithJug(target:DisplayObject):Boolean
{
    if (jug.hitTestObject(target))
        return true;
    else
        return false;
}

//Got collision
function collisionOccur():void
{
    eggs += 1;
    egg.x = eggStartPos.x;
    egg.y = eggStartPos.y;

    eggAmountCounter();
}


//How many eggs:
function eggAmountCounter():void
{
    if(eggs == 3)
    {
        eggAmount.text = "Corrent Amount";
    }
}

Actionscript 3.0添加和删除子项

2 个答案: