拖放 UI 布局中的对象

<UserControl x:Class="DragAndDropSimple.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Width="400" Height="300">
  <Canvas x:Name="rootCanvas"
  Width="640"
  Height="480"
  Background="Gray"
  >
    <!-- You can drag this rectangle around the canvas. -->
    <Rectangle
    MouseLeftButtonDown="Handle_MouseDown"
    MouseMove="Handle_MouseMove"
    MouseLeftButtonUp="Handle_MouseUp"
    Canvas.Left="30" Canvas.Top="30" Fill="Red"
    Width="50" Height="50" />
  </Canvas>

</UserControl>

// Global variables used to keep track of the 
// mouse position and whether the object is captured
// by the mouse.
bool isMouseCaptured;
double mouseVerticalPosition;
double mouseHorizontalPosition;

public void Handle_MouseDown (object sender, MouseEventArgs args) 
{
    Rectangle item = sender as Rectangle;
    mouseVerticalPosition = args.GetPosition(null).Y;
    mouseHorizontalPosition = args.GetPosition(null).X;
    isMouseCaptured = true;
    item.CaptureMouse();
}

public void Handle_MouseMove(object sender, MouseEventArgs args) 
{
    Rectangle item = sender as Rectangle;
    if (isMouseCaptured) 
    {

        // Calculate the current position of the object.
        double deltaV = args.GetPosition(null).Y - mouseVerticalPosition;
        double deltaH = args.GetPosition(null).X - mouseHorizontalPosition;
        double newTop = deltaV + (double)item.GetValue(Canvas.TopProperty);
        double newLeft = deltaH + (double)item.GetValue(Canvas.LeftProperty);

        // Set new position of object.
        item.SetValue(Canvas.TopProperty, newTop);
        item.SetValue(Canvas.LeftProperty, newLeft);

        // Update position global variables.
        mouseVerticalPosition = args.GetPosition(null).Y;
        mouseHorizontalPosition = args.GetPosition(null).X;
    }
}

public void Handle_MouseUp(object sender, MouseEventArgs args) 
{
    Rectangle item = sender as Rectangle;
    isMouseCaptured = false;
    item.ReleaseMouseCapture();
    mouseVerticalPosition = -1;
    mouseHorizontalPosition = -1;
}