解决的问题：对一个域多个控件实现可拖放的鼠标操作，将此实现封装为一个常用类以便复用
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);
}
}
原文参考：http://bbs.silverlightchina.net/forum.PHP?mod=viewthread&tid=2143&extra=page%3D2%26filter%3Ddigest%26digest%3D1
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 [email protected] 举报，一经查实，本站将立刻删除。