1

我对拖放功能和对象选择有疑问。

我创建了简单的 Flash 编曲器(将表格图标添加到舞台 - 房间)。我有创建表格图标的新实例的按钮,我可以在舞台上拖放。

问题是我只能拖放最后添加的图标。如果我添加新的实例 od 图标,我将无法获取(拖放)之前创建的任何图标:/

我的代码在这里:主类

import flash.events.MouseEvent;
import flash.events.Event;
import com.adobe.images.JPGEncoder;
import flash.geom.Point;

btn_middleTable.addEventListener(MouseEvent.CLICK, f_middleIco);
btn_bigTable.addEventListener(MouseEvent.CLICK, f_bigIco);
btnSave.addEventListener(MouseEvent.CLICK, f_save);

function f_middleIco(event:MouseEvent):void
{
    var middle:MiddleIco = new MiddleIco();
    middle.x = 20;
    middle.y = 20;
    stage.addChild(middle);
    trace("created");
}

function f_bigIco(event:MouseEvent):void
{
    var big:BigIco = new BigIco();
    big.x = 20;
    big.y = 20;
    stage.addChild(big);
    trace("created");
}

function f_save(event:MouseEvent)
{
    var jpgEncoder:JPGEncoder;
    jpgEncoder = new JPGEncoder(90);

    var bitmapData:BitmapData = new BitmapData(stage.width, stage.height);
    bitmapData.draw(stage, new Matrix());
    var img = jpgEncoder.encode(bitmapData);

    var file:FileReference = new FileReference();
    file.save(img, "filename.png");
}

图标实例包:

package  {

    import flash.display.MovieClip;
    import flash.events.MouseEvent;
    import flash.events.Event;
    import flash.geom.Point;

    public class BigIco extends MovieClip {
            public var active:Boolean;

        public function BigIco() {
            // constructor code
            this.addEventListener(Event.ENTER_FRAME, f_move);
            this.addEventListener(MouseEvent.MOUSE_DOWN,downf);
            this.addEventListener(MouseEvent.MOUSE_UP,upf);
        }

        public function f_move(e:Event)
        {
            if(active==true)
            {
                startDrag();
            }
            else if(active==false)
            {
                stopDrag();
            }
        }

        public function downf(e:MouseEvent)
        {
            active = true;
        }
        public function upf(e:MouseEvent)
        {
            active = false;
        }
}
}

我该怎么做才能选择实际上在鼠标光标上的每个图标(实例)?

4

1 回答 1

0

理论:startDrag并不stopDrag意味着被重复调用 - 但它们会在每一帧,对于你添加的每个剪辑,因为你正在使用一个ENTER_FRAME监听器。

我没有对此进行测试,但调用stopDrag实际上可能会停止任何拖动 - 包括在其他剪辑上 - 因为您首先只允许拖动单个Sprite(因此MovieClip

因此,如果该理论成立,startDrag()您的第一个图标将通过f_move()调用新图标立即取消stopDrag()

但是在任何情况下都不需要你作为ENTER_FRAME听众。这应该给出相同的结果(除了它实际上有效) - 只需立即在鼠标侦听器中调用拖动方法:

public class BigIco extends MovieClip {
    public var active:Boolean;

    public function BigIco() {
        // constructor code
        this.addEventListener(MouseEvent.MOUSE_DOWN, downf);
        this.addEventListener(MouseEvent.MOUSE_UP, upf);
    }

    public function downf(e:MouseEvent)
    {
        // Unless you're going to use 'active' for other stuff,
        // you can remove this line:
        active = true; 
        startDrag();
    }
    public function upf(e:MouseEvent)
    {
        // Same here:
        active = false;
        stopDrag();
    }
}

除此之外,我无法在您的代码中发现任何真正的问题。

编辑:“完美”版本,如果指针不在图标上,也会检测鼠标向上:

public class BigIco extends MovieClip {

    public function BigIco() {
        // Only add mouse down listener here. We'll add up when needed below:
        this.addEventListener(MouseEvent.MOUSE_DOWN,downf);
    }

    public function downf(e:MouseEvent)
    {
        // Add event listener to stage, so as to be triggered even if
        // the pointer isn't over the icon when releasing the button.
        // Note that this will also work even with the mouse *outside*
        // the stage/swf area:
        stage.addEventListener(MouseEvent.MOUSE_UP,upf);
        startDrag();
    }
    public function upf(e:MouseEvent)
    {
        // Remember to remove the event listener after use:
        stage.removeEventListener(MouseEvent.MOUSE_UP, upf);
        stopDrag();
    }
}
于 2013-07-13T09:25:22.533 回答