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我想在我的應用程序中實現拖動&拖放的可能性。這裏是我的源代碼：Flex：拖放，簡單示例
我將圖像添加到容器，現在想要能夠將它們從元素PieceContainer移動到元素板（在另一個類中定義）。我試圖定義鼠標移動處理程序，因爲它是如下所示：http://livedocs.adobe.com/flex/3/html/help.html?content=dragdrop_7.html，但它不會做任何事情......其實我也不知道我應該如何定義DRAP引發劑，滴處理
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);
}
}
也請見所附圖片爲一些描述： http://img.skitch.com/20091221-e6j8d62y9iin621hmcdbssrp6d.png
我重組代碼是這樣的：
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);
}
並且還添加拖放處理板：
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;
}
但實際上有2個問題：
第一：項目可以拖動，但是當我將它們添加到登上他們在PiecesContainer巋然不動。 二：我要項目被複制，而並非只是移動（但是當他們在船上，他們應該是可移動的，不可複製）
感謝，提前