silverlight 拖拽

 

#region 拖拽事件
        Point mouseOffest;
        protected void canvalRoot_MouseLeftButtonDown(object o, MouseButtonEventArgs e)
        {
            Canvas obj = o as Canvas;
            obj.CaptureMouse();
            mouseOffest = e.GetPosition(obj);
            obj.MouseMove += new MouseEventHandler(canvalRoot_MouseMove);
            obj.MouseLeftButtonUp += new MouseButtonEventHandler(obj_MouseLeftButtonUp);
        }
        protected void obj_MouseLeftButtonUp(object o, MouseButtonEventArgs e)
        {
            Canvas obj = o as Canvas;
            obj.ReleaseMouseCapture();
            Point pointEnd = e.GetPosition(this.Parent as Canvas);
            Canvas.SetLeft(obj, pointEnd.X - mouseOffest.X);
            Canvas.SetTop(obj, pointEnd.Y - mouseOffest.Y);
            obj.MouseMove -= new MouseEventHandler(canvalRoot_MouseMove);
            obj.MouseLeftButtonUp -= new MouseButtonEventHandler(obj_MouseLeftButtonUp);
        }
        protected void canvalRoot_MouseMove(object o, MouseEventArgs e)
        {
            Canvas obj = o as Canvas;
            Point pointNow = e.GetPosition(this.Parent as Canvas);
            Canvas.SetLeft(obj, pointNow.X - mouseOffest.X);
            Canvas.SetTop(obj, pointNow.Y - mouseOffest.Y);
        }
        #endregion

这只是基本的拖拽

SL3.0以上，可以实现拖放目标的事件

AllowDrop

DragEnter

DragLeave

DragOver

Drop