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How to: Create a Rollover Effect Using Events

This example shows how to change the color of an element as the mouse pointer enters and leaves the area occupied by the element.

This example consists of a Extensible Application Markup Language (XAML) file and a code-behind file.

Note Note

This example demonstrates how to use events, but the recommended way to achieve this same effect is to use a Trigger in a style. For more information, see Styling and Templating.

The following XAML creates the user interface, which consists of Border around a TextBlock, and attaches the MouseEnter and MouseLeave event handlers to the Border.

<StackPanel>
  <Border MouseEnter="OnMouseEnterHandler"
          MouseLeave="OnMouseLeaveHandler"
          Name="border1" Margin="10"
          BorderThickness="1"
          BorderBrush="Black"
          VerticalAlignment="Center"
          Width="300" Height="100">
    <Label Margin="10" FontSize="14"
           HorizontalAlignment="Center">Move Cursor Over Me</Label>
  </Border>
</StackPanel>

The following code behind creates the MouseEnter and MouseLeave event handlers. When the mouse pointer enters the Border, the background of the Border is changed to red. When the mouse pointer leaves the Border, the background of the Border is changed back to white.

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();
    }

    // raised when mouse cursor enters the area occupied by the element 
    void OnMouseEnterHandler(object sender, MouseEventArgs e)
    {
        border1.Background = Brushes.Red;
    }

    // raised when mouse cursor leaves the area occupied by the element 
    void OnMouseLeaveHandler(object sender, MouseEventArgs e)
    {
        border1.Background = Brushes.White;
    }
}

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