Silverlight 简单拖曳

Webcast 上一个小Demo

 

隐藏行号 复制代码 ？ 这是一段程序代码。

1. private WrapPanel imageContainer = null;
   

2. private SolidColorBrush enterColor = new SolidColorBrush(Colors.DarkGray);
   

3. private SolidColorBrush LeaveColor = new SolidColorBrush(Colors.Transparent);
   

5. public MainPage()
   

6. {
   

7.     InitializeComponent();
   

9.     imageContainer = new WrapPanel() { Background = new SolidColorBrush(Colors.LightGray) };
   

11.     scrvierwer.Content = imageContainer;
    

13.     imageContainer.AllowDrop = true;
    

14.     imageContainer.Drop += new DragEventHandler(imageContainer_Drop);
    

15. }
    

17. void imageContainer_Drop(object sender, DragEventArgs e)
    

18. {
    

19.     FileInfo[] droppedfiles = e.Data.GetData(DataFormats.FileDrop) as FileInfo[];
    

21.     foreach (FileInfo item in droppedfiles)
    

22.     {
    

23.         if (IsSupportedImageFile(item.Extension.ToLower()))
    

24.         {
    

25.             Border imagePlaceHolder = new Border()
    

26.             {
    

27.                 Child = CreateImage(item),
    

28.                 Margin = new Thickness(10.0),
    

29.                 Cursor = Cursors.Hand
    

30.             };
    

32.             ToolTipService.SetToolTip(imagePlaceHolder, item.Name);
    

34.             imagePlaceHolder.MouseEnter += new MouseEventHandler(imagePlaceHolder_MouseEnter);
    

35.             imagePlaceHolder.MouseLeave += new MouseEventHandler(imagePlaceHolder_MouseLeave);
    

37.             imageContainer.Children.Add(imagePlaceHolder);
    

39.         }
    

40.     }
    

41. }
    

43. void imagePlaceHolder_MouseLeave(object sender, MouseEventArgs e)
    

44. {
    

45.     (sender as Border).Background = LeaveColor;
    

46. }
    

48. void imagePlaceHolder_MouseEnter(object sender, MouseEventArgs e)
    

49. {
    

50.     (sender as Border).Background = enterColor;
    

51. }
    

53. private bool IsSupportedImageFile(string extension)
    

54. {
    

55.     if (extension == ".jpg" || extension == ".png")
    

56.     {
    

57.         return true;
    

58.     }
    

59.     return false;
    

60. }
    

62. private Image CreateImage(FileInfo droppedfile)
    

63. {
    

64.     using (FileStream filestreame = droppedfile.OpenRead())
    

65.     {
    

66.         BitmapImage bitmapimage = new BitmapImage();
    

67.         bitmapimage.SetSource(filestreame);
    

68.         return new Image() { Source = bitmapimage, Width = 100, Margin = new Thickness(5.0) };
    

69.     }
    

70. }