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UIElement.MouseLeave 事件

Occurs when the mouse pointer leaves the bounds of this element.

命名空间: System.Windows
程序集: PresentationCore(在 presentationcore.dll 中)
XML 命名空间:  http://schemas.microsoft.com/winfx/2006/xaml/presentation

public event MouseEventHandler MouseLeave
/** @event */
public final void add_MouseLeave (MouseEventHandler value)

/** @event */
public final void remove_MouseLeave (MouseEventHandler value)

在 JScript 中,可处理由类定义的事件,但无法定义自己的事件。
<object MouseLeave="MouseEventHandler" .../>

Identifier field

MouseLeaveEvent

Routing strategy

Direct

Delegate

MouseEventHandler

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

MouseLeave is a routed event that uses the direct event handling routing strategy. Direct routed events are not raised along a route; instead, they are handled in the same element where they are raised. However, they do enable other aspects of routed event behavior, such as event triggers in styles.

Although MouseLeave tracks when the mouse leaves an element, this event more literally reports that the IsMouseOver property value has changed from true to false on this element.

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

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. For the complete samples, see Mouse Pointer Sample.

说明注意:

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 Styles Overview.

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;
    }
}

Windows Vista、Microsoft Windows XP SP2 和 Windows Server 2003 SP1 支持 Microsoft .NET Framework 3.0。

.NET Framework

受以下版本支持:3.0

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