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UIElement.MouseMove Event

Occurs when the mouse pointer moves while over this element.

Namespace:  System.Windows
Assembly:  PresentationCore (in PresentationCore.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

'Declaration
Public Event MouseMove As MouseEventHandler
'Usage
Dim instance As UIElement 
Dim handler As MouseEventHandler 

AddHandler instance.MouseMove, handler
<object MouseMove="MouseEventHandler" .../>

Implements

IInputElement.MouseMove

Identifier field

MouseMoveEvent

Routing strategy

Bubbling

Delegate

MouseEventHandler

  • The corresponding tunneling event is PreviewMouseMove.

  • Override OnMouseMove to implement class handling for this event in derived classes.

This event creates an alias for the Mouse.MouseMove attached event for this class, so that MouseMove is part of the class members list when UIElement is inherited as a base element. Event handlers that are attached to the MouseMove event are attached to the underlying Mouse.MouseMove attached event and receive the same event data instance.

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 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

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0
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