Question

我正在尝试构建一个拖放游戏，用户可以使用我提供的图像构建一些东西。我将在菜单中显示用户可以单击并拖动到建筑区域的图像。用户将能够根据需要添加该图像的多个实例。

我能够让它的一部分工作。到目前为止，我可以单击图像并将其拖动，然后根据需要创建尽可能多的实例。但是，我放置后无法点击并拖动图片。

当我进行跟踪以查看名称时，它表示所有新实例都名为hillChild1。我试图将它们命名为hillChild1，hillChild2等，但这似乎并不起作用......但不确定这是一个问题。

这是我的代码：

thesubmenu1.hill.addEventListener(MouseEvent.MOUSE_DOWN, onDown);
stage.addEventListener(MouseEvent.MOUSE_UP, onUp);

var myImage:Sprite = Sprite(new Hill_mc());
var i:Number=0; i++;


function onDown(e:MouseEvent):void {
    var myImage:Sprite = Sprite(new Hill_mc());
    myImage.name = "hillChild"+i;
    addChild(myImage);
    myImage.x = mouseX;
    myImage.y = mouseY;
    myImage.startDrag();
    myImage.buttonMode = true;
}
function onUp(e:MouseEvent):void {
    var myImage:Sprite = Sprite(new Hill_mc());
    myImage.stopDrag();
    myImage.name = "hillChild";
}



stage.addEventListener(MouseEvent.CLICK, traceName);
function traceName(event:MouseEvent):void { trace(event.target.name); }



myImage.getChild(myImage).addEventListener("mouseDown", mouseDownHandler);
stage.addEventListener("mouseUp", mouseUpHandler);

function mouseDownHandler (e:MouseEvent):void{
   myImage.startDrag();
}
function mouseUpHandler (e:MouseEvent):void{
   myImage.stopDrag();
}

我不熟悉StackOverflow以及Actionscript 3，如果它不明显的话。

Answer 1

您的问题可能是您在鼠标上创建新实例（当您想要的是对已经在鼠标按下时创建的实例的引用）。此外，您永远不会向新对象添加单击侦听器。只有在鼠标按下后才能将鼠标向上侦听器添加到舞台上（然后在鼠标中删除侦听器）。

thesubmenu1.hill.addEventListener(MouseEvent.MOUSE_DOWN, createCopy);

var i:int=0;
var tmpImage:Sprite; //to store which image is being dragged currently

function createCopy(e:MouseEvent):void {
    tmpImage = new Hill_mc();
    tmpImage.name = "hillChild"+(i++); //increment every copy
    addChild(tmpImage);
    tmpImage.x = mouseX;
    tmpImage.y = mouseY;
    tmpImage.startDrag();
    tmpImage.buttonMode = true;
    tmpImage.addEventListener(MouseEvent.MOUSE_DOWN, onDown); //add the mouse down to this new object
    stage.addEventListener(MouseEvent.MOUSE_UP, onUp); //since the mouse is currently down, we need to listen for mouse up to tell the current copy to stop dragging
}

//this will be called when click a copy
function onDown(e:MouseEvent):void {
    tmpImage = Sprite(e.currentTarget); //get a reference to the one that was clicked, so we know which object to stop dragging on the global mouse up.
    stage.addEventListener(MouseEvent.MOUSE_UP, onUp); //listen for the mouse up
    tmpImage.startDrag();
}
function onUp(e:MouseEvent):void {
    stage.removeEventListener(MouseEvent.MOUSE_UP,onUp); //now that the mouse is released, stop listening for mouse up
    tmpImage.stopDrag(); //stop dragging the one that was clicked
}

Actionscript 3 - 如何使新实例可拖动？

1 个答案: