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MouseEventHandler Delegate

Represents the method that will handle mouse related events such as MouseEnter and MouseMove.

Namespace: System.Windows.Input
Assembly: PresentationCore (in presentationcore.dll)

public delegate void MouseEventHandler (
	Object sender,
	MouseEventArgs e
)
/** @delegate */
public delegate void MouseEventHandler (
	Object sender, 
	MouseEventArgs e
)
In XAML, you can use delegates but you cannot define your own.

Parameters

sender

The source of the event

e

The event data

The MouseEventHandler is used with the following events: GotMouseCapture, LostMouseCapture, MouseEnter, MouseLeave, MouseMove, and the corresponding tunneling events.

When you create a MouseEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see Events and Delegates.

This example shows how to change the dimensions of an object when the mouse pointer moves on the screen.

The example includes an Extensible Application Markup Language (XAML) file that creates the user interface (UI) and a code-behind file that creates the event handler. For the complete sample, see Moving an Object with the Mouse Pointer Sample.

The following XAML creates the UI, which consists of an Ellipse inside of a StackPanel, and attaches the event handler for the MouseMove event.

<Window x:Class="WCSamples.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://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>

The following code behind creates the MouseMove event handler. When the mouse pointer moves, the height and the width of the Ellipse are increased and decreased.

// 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.
    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;
}

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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