Question

你能不能帮我弄清楚是什么原因造成我程序中的意外输出？我用过flash cs5和as3。这是一个拖放游戏。

找不到任何错误，但我的 MOUSE_UP 和 MOUSE_DOWN 无法正常运行。（在我看来）

我说这是因为，当我测试代码时，当我点击对象时。鼠标有点像点击或类似的功能。我不能放弃这个物体。

这是我用于拖放的代码集

 wintersquash_mc.buttonMode = true;
 wintersquash_mc.addEventListener(MouseEvent.MOUSE_DOWN, pickupObject);
 wintersquash_mc.addEventListener(MouseEvent.MOUSE_UP, dropObject);

 function pickupObject(event:MouseEvent):void
 {
event.target.startDrag(true);
event.target.parent.addChild(event.target);
objectoriginalX = event.target.x;
objectoriginalY = event.target.y;
 }
 function dropObject(event:MouseEvent):void
 {
event.target.stopDrag();
var matchingTargetName:String = "target" + event.target.name;
var matchingTarget:DisplayObject = getChildByName(matchingTargetName);
if (event.target.dropTarget != null && event.target.dropTarget.parent == matchingTarget)
{
    event.target.removeEventListener(MouseEvent.MOUSE_DOWN, pickupObject);
    event.target.removeEventListener(MouseEvent.MOUSE_UP, dropObject);
    event.target.buttonMode = false;
    event.target.x = matchingTarget.x;
    event.target.y = matchingTarget.y;
    scorer++;
    score.text = String(scorer);
}
else
{
    event.target.x = objectoriginalX;
    event.target.y = objectoriginalY;
}
 }

希望有人能告诉我为什么它不能正常工作:(

Answer 1

尝试将MOUSE_UP添加到舞台，而不是动画片段。这应该确保无论鼠标在哪里都会捕获事件。

此外，您可以考虑在pickupObject（）运行后仅添加MOUSE_UP侦听器。像这样：

wintersquash_mc.buttonMode = true;
wintersquash_mc.addEventListener(MouseEvent.MOUSE_DOWN, pickupObject);

function pickupObject(event:MouseEvent):void
{
    event.target.startDrag(true);
    event.target.parent.addChild(event.target);
    objectoriginalX = event.target.x;
    objectoriginalY = event.target.y;
    stage.addEventListener(MouseEvent.MOUSE_UP, dropObject);
}

这将要求您的类具有对Stage对象的引用。此外，您必须在完成后从舞台中显式删除侦听器。不过试一试，看看它是否适合你。

Answer 2

我通常会像这样拖拉：

wintersquash_mc.buttonMode = true;

wintersquash_mc.mouseChildren = false;
//this way you won't start dragging i.e. a sub-movieclip of the button

wintersquash_mc.addEventListener(MouseEvent.MOUSE_DOWN, pickupObject);

function pickupObject(event:MouseEvent):void
{
    event.target.startDrag(true);

    event.target.parent.addChild(event.target);
    // is it necessary to add the clip to its parent?
    // I would rather make a var on the root,
    // and dump the event.target into that like this:
    // root.nowDragged = event.target;

    objectoriginalX = event.target.x;
    objectoriginalY = event.target.y;
    stage.addEventListener(MouseEvent.MOUSE_UP, dropObject);
}

function dropObject(event:MouseEvent):void
{
    root.nowDragged.stopDrag(true);
    stage.removeEventListener(MouseEvent.MOUSE_UP, dropObject);
    // this removes the listener to prevent false alarms on other mouse ups
    //... (rest of your code)
}

我希望这会有所帮助。

拖放时使用MOUSE_UP和MOUSE_DOWN在flash中出现问题

2 个答案: