如何：使对象跟随鼠标指针移动
更新：2007 年 11 月
此示例演示当鼠标指针在屏幕上移动时如何更改对象的维度值。
此示例包括一个用来创建用户界面 (UI) 的可扩展应用程序标记语言 (XAML) 文件和一个用来创建事件处理程序的代码隐藏文件。有关完整示例，请参见 使用鼠标指针移动对象的示例。
示例
下面的 XAML 创建了 UI（它在 StackPanel 内包括了一个 Ellipse），并附加了 MouseMove 事件的事件处理程序。
<Window x:Class="WCSamples.Window1"
xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
Title="mouseMoveWithPointer"
Height="400"
Width="500"
>
<Canvas MouseMove="MouseMoveHandler"
Background="LemonChiffon">
<Ellipse Name="ellipse" Fill="LightBlue"
Width="100" Height="100"/>
</Canvas>
</Window>
下面的隐藏代码创建 MouseMove 事件处理程序。 当鼠标指针移动时，Ellipse 的高度和宽度随之进行增加和减少。
' raised when the mouse pointer moves.
' Expands the dimensions of an Ellipse when the mouse moves.
Private Sub OnMouseMoveHandler(ByVal sender As Object, ByVal e As MouseEventArgs)
'Get the x and y coordinates of the mouse pointer.
Dim position As System.Windows.Point
position = e.GetPosition(Me)
Dim pX As Double
pX = position.X
Dim pY As Double
pY = position.Y
'Set the Height and Width of the Ellipse to the mouse coordinates.
ellipse1.Height = pY
ellipse1.Width = pX
End Sub
// raised when the mouse pointer moves.
// Expands the dimensions of an Ellipse when the mouse moves.
private void MouseMoveHandler(object sender, MouseEventArgs e)
{
// Get the x and y coordinates of the mouse pointer.
System.Windows.Point position = e.GetPosition(this);
double pX = position.X;
double pY = position.Y;
// Sets the Height/Width of the circle to the mouse coordinates.
ellipse.Width = pX;
ellipse.Height = pY;
}