图片拖放的实现(drag and drop)

1. backgroundColor="#333333" xmlns:tools="tools.*" creationComplete="init();"
2. >
3.  
4. <!--[CDATA[
5. import mx.core.UIComponent;
6. import mx.core.DragSource;
7. import mx.events.DragEvent;
8. import mx.managers.DragManager;
9.  
10. [Embed(source="images/aoao_120.png")]-->     private var imgsrc:Class;
11.  
12. private function init():void
13. {
14. img1.source = imgsrc;
15. img2.source = imgsrc;
16. }
17.  
18. /**
19. * 开始拖拽
20. * */
21. private function dragHandler(event:MouseEvent):void
22. {
23. // 定义拖拽挂载数据源
24. var ds:DragSource = new DragSource();
25. // 定义拖拽图标(用于第二副图片的拖拽)
26. var di:Image = new Image();
27. // 拖拽对象
28. var target:Image = event.currentTarget as Image;
29.  
30. // 添加拖拽数据源数据
31. ds.addData(target, "img");
32. ds.addData(event.localX, "x");
33. ds.addData(event.localY, "y");
34.  
35. // 拖拽图标
36. if (target.id == "img2")
37. di.source = new Bitmap(getBitmapData(target.content));
38. else
39. di = null;
40. // 执行拖拽
41. DragManager.doDrag(target, ds, event, di);
42. }
43. /**
44. * 进入拖放区域
45. * */
46. private function dragEnterHandler(event:DragEvent):void
47. {
48. // 进入区域, 设置状态为允许拖放
49. if (event.dragSource.hasFormat("img"))
50. DragManager.acceptDragDrop(event.target as UIComponent);
51. }
52. /**
53. * 释放拖拽
54. * */
55. private function dragDropHandler(event:DragEvent):void
56. {
57. // 复制图片
58. var img:Image = new Image();
59. img.source = new Bitmap(getBitmapData(event.dragSource.dataForFormat("img") as DisplayObject));
60. // 处理图片防止位置
61. img.x = event.currentTarget.mouseX - (event.dragSource.dataForFormat("x") as Number);
62. img.y = event.currentTarget.mouseY - (event.dragSource.dataForFormat("y") as Number);
63. // 显示图片
64. event.currentTarget.addChild(img);
65. }
66. /**
67. * 获取图片信息
68. * */
69. private function getBitmapData(target:DisplayObject):BitmapData
70. {
71. var res:BitmapData = new BitmapData(target.width, target.height);
72. res.draw(target);
73. return res;
74. }
75. ]]&gt;
76.  
77.  
78.  
79.  
80.  
81.  
82.  
83. dragEnter="dragEnterHandler(event);" dragDrop="dragDropHandler(event);" /&gt;