Question

我想在我的应用程序中实现拖放可能性。这是我的源代码：

我将图像添加到容器中，现在希望能够将它们从元素PieceContainer移动到元素板（在另一个类中定义）。我尝试定义鼠标移动处理程序，因为它显示在这里：http://livedocs.adobe.com/flex/3/html/help.html?content=dragdrop_7.html，但它没有做任何事情......实际上我不明白我应该如何定义drap启动器，并删除处理程序

public class PieceContainer extends Canvas
{
    //private var image:Image = new Image();
    private var piecesWhite:Dictionary;
    private var piecesBlack:Dictionary; 
    private var images:ArrayCollection = new ArrayCollection();
    private var placeX:Number;

    public var items:Dictionary;

    public function PieceContainer()
    {
        super();
        this.addEventListener(Event.ADDED_TO_STAGE, displayPiece);
    }

    private function displayPiece(event:Event):void
    {
        placePiecesDict(new Point(0, 0), items);
    }

    private function placePiecesDict(start:Point, dict:Dictionary):void
    {
        placeX = 0;
        for (var item:* in dict)
    {

            var image:Image = new Image();
                image.source = dict[item];
                image.x = placeX/1.4;
                image.y = start.y;
                image.addEventListener(MouseEvent.MOUSE_MOVE, doDrag);
                images.addItem(image);
                this.addChild(image);
            placeX += height; 
            }
        }


        private function doDrag(evt:Event):void
        {
            trace(evt);
        }
    }

有关更多说明，请参阅附图： http://img.skitch.com/20091221-e6j8d62y9iin621hmcdbssrp6d.png

我用这种方式重新组织了代码：

public class PieceContainer extends Canvas
{

    private var piecesWhite:Dictionary;
    private var piecesBlack:Dictionary; 
    private var images:ArrayCollection = new ArrayCollection();
    private var placeX:Number;  
    public var items:Dictionary;

    public function PieceContainer()
    {
        super();
        this.addEventListener(Event.ADDED_TO_STAGE, displayPiece);
    }

    private function displayPiece(event:Event):void
    {
        placePiecesDict(new Point(0, 0), items);
    }

    private function placePiecesDict(start:Point, dict:Dictionary):void
    {
        placeX = 0;
        for (var item:* in dict)
        {

            var image:Image = new Image();
                     image.source = dict[item];
                     image.x = placeX/1.4;
                 image.y = start.y;
                 image.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
            images.addItem(image);
            this.addChild(image);
            placeX += height; 
        }
        }


    private function mouseMoveHandler(evt:MouseEvent):void
    {

        var dragInitiator:Image =  Image(evt.currentTarget);
        var ds:DragSource = new DragSource();
        ds.addData(dragInitiator, "img");
        DragManager.doDrag(dragInitiator, ds, evt);
    }

并且还在棋盘上添加了拖放处理程序：

public class BoardCell extends Canvas
{

    private var _color:Number;

    public function BoardCell()
    {
        super();
        this.addEventListener(DragEvent.DRAG_ENTER, dragEnterHanler);
        this.addEventListener(DragEvent.DRAG_DROP, dragDropHandler);
    }

    public function placeMe(x:int, y:int, width:Number, color:Number):void
    {
        graphics.lineStyle(1, 0x000000);
        graphics.beginFill(color);
        graphics.drawRect(x, y, width, width);
        graphics.endFill(); 
    }


    private function dragEnterHanler(event:DragEvent):void
    {
        if(event.dragSource.hasFormat("img"))
        {
            DragManager.acceptDragDrop(Canvas(event.currentTarget))
        }
    }

    private function dragDropHandler(event:DragEvent):void
    {
        event.dragInitiator.x = 0;
        event.dragInitiator.y = 0;

    }

但实际上有两个问题：

首先：项目是可拖动的，但是当我将它们添加到板上时，它们会保留在PiecesContainer中。第二：我希望复制项目，而不是移动（但是当他们在船上时，他们应该是可移动的，而不是复制的）

先谢谢

Answer 1

第一个问题很容易解决。 dragMoveEnabled=true是如何在列表控件中执行的，但由于您执行的操作非常自定义，因此您需要回顾拖动启动器并从中删除药品。详细信息： http://livedocs.adobe.com/flex/3/html/help.html?content=dragdrop_8.html

这也可以帮助您设置拖放功能，以便您也可以解决问题2。

Flex：拖放，简单的例子

1 个答案: