開發(fā)日常的Silverlight應(yīng)用程序時(shí)，常常要對一個域多個控件實(shí)現(xiàn)可拖放的MOUSE操作，在Silverlight中實(shí)現(xiàn)拖放的功能其實(shí)非常簡單，但是為了提高程序功能代碼的可復(fù)用性，程序員常常喜歡把常用的代碼封裝成一個工具類，例如Asp.net中常用SQLHelper類，用來操作數(shù)據(jù)庫的，這里我們介紹的類是在Silverlight中實(shí)現(xiàn)拖動的工具類，它支持Silverlight2.0至Silverlight4.0的各個版本通用，好了話不多說，我們還是看代碼吧：

public static class DragDrop
{private static bool IsDragging = false;private static Point curPoint;private const int MAX_ZINDEX = 99999;private const double CURRENT_OPACITY = 0.5;private static int lastZIndex;private static double lastOpacity;private static void sender_MouseLeftButtonDown(object sender, MouseButtonEventArgs e){UIElement uiElement = sender as UIElement;if (uiElement != null){uiElement.CaptureMouse();lastZIndex = (int)uiElement.GetValue(Canvas.ZIndexProperty);uiElement.SetValue(Canvas.ZIndexProperty, MAX_ZINDEX);lastOpacity = uiElement.Opacity;uiElement.Opacity = CURRENT_OPACITY;IsDragging = true;curPoint = new Point(e.GetPosition(null).X, e.GetPosition(null).Y);}}private static void sender_MouseMove(object sender, MouseEventArgs e){if (!IsDragging){return;}UIElement uiElement = sender as UIElement;if (uiElement != null){double currentLeft = (double)uiElement.GetValue(Canvas.LeftProperty);double currentTop = (double)uiElement.GetValue(Canvas.TopProperty);double newLeft = (double)currentLeft + e.GetPosition(null).X - curPoint.X;double newTop = (double)currentTop + e.GetPosition(null).Y - curPoint.Y;uiElement.SetValue(Canvas.LeftProperty, newLeft);uiElement.SetValue(Canvas.TopProperty, newTop);curPoint = new Point(e.GetPosition(null).X, e.GetPosition(null).Y);}}private static void sender_MouseLeftButtonUp(object sender, MouseButtonEventArgs e){UIElement uiElement = sender as UIElement;if (uiElement != null){uiElement.ReleaseMouseCapture();IsDragging = false;uiElement.SetValue(Canvas.ZIndexProperty, lastZIndex);uiElement.Opacity = lastOpacity;}}public static void Load(UIElement sender){sender.MouseLeftButtonDown += new MouseButtonEventHandler(sender_MouseLeftButtonDown);sender.MouseLeftButtonUp += new MouseButtonEventHandler(sender_MouseLeftButtonUp);sender.MouseMove += new MouseEventHandler(sender_MouseMove);}public static void UnLoad(UIElement sender){sender.MouseLeftButtonDown -= new MouseButtonEventHandler(sender_MouseLeftButtonDown);sender.MouseLeftButtonUp -= new MouseButtonEventHandler(sender_MouseLeftButtonUp);sender.MouseMove -= new MouseEventHandler(sender_MouseMove);}
}DragDrop工具類的使用方法：

DragDrop.Load(LayoutRoot);

DragDrop是一個靜態(tài)類，使用起來非常簡單，以上只要一行代碼就可以實(shí)現(xiàn)對Grid控件的拖放操作了。

希望對大家有所幫助~！

轉(zhuǎn)載于:https://www.cnblogs.com/slteam/archive/2010/03/18/1689384.html

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