我有一个窗户,上面有一个按钮。该按钮具有上下文菜单:
<Window>
<ScrollViewer Height="500">
<Button Height = "2000">
<Button.ContextMenu>
<ContextMenu>
<MenuItem Header="Item1"></MenuItem>
<MenuItem Header="Item2"></MenuItem>
<MenuItem Header="Item3"></MenuItem>
</ContextMenu>
</Button.ContextMenu>
</Button>
</ScrollViewer>
</Window>
[只要我右键单击按钮,就会显示上下文菜单。当我将鼠标移出上下文菜单并滚动滚轮时,scrollViewer根本不会滚动。我已经尝试了许多关于鼠标离开或鼠标进入事件的方法,但是没有任何帮助。我希望上下文菜单仍然显示,但是将转轮事件发送到scrollViewer(或窗口),如果我在上下文菜单之外单击,它将正常关闭。
在win窗体应用程序中,我有相同的问题,但是我可以通过使用ContextMenuStrip替代ContextMenu来解决。在WPF中,看起来像没有ContextMenuStrip。
ContextMenu
的理解,您可以使用看起来像Popup
的ContextMenu
:<ScrollViewer Height="500">
<Button Height="2000">
<Popup x:Name="popup" Placement="Mouse" StaysOpen="False"
xmlns:theme="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero2">
<theme:SystemDropShadowChrome Name="Shdw" Color="Transparent" SnapsToDevicePixels="true">
<Border Name="ContextMenuBorder" Background="#F5F5F5" BorderBrush="#FF959595" BorderThickness="1" SnapsToDevicePixels="True">
<ScrollViewer Name="ContextMenuScrollViewer" Grid.ColumnSpan="2" Margin="1,0"
Style="{DynamicResource {ComponentResourceKey TypeInTargetAssembly={x:Type FrameworkElement}, ResourceId=MenuScrollViewer}}">
<Grid RenderOptions.ClearTypeHint="Enabled">
<Canvas Height="0" Width="0" HorizontalAlignment="Left" VerticalAlignment="Top">
<Rectangle Name="OpaqueRect" Height="{Binding ElementName=ContextMenuBorder, Path=ActualHeight}"
Width="{Binding ElementName=ContextMenuBorder, Path=ActualWidth}"
Fill="{Binding ElementName=ContextMenuBorder, Path=Background}"
SnapsToDevicePixels="True"/>
</Canvas>
<Rectangle Fill="#F1F1F1" HorizontalAlignment="Left" Width="28" Margin="1,2" RadiusX="2" RadiusY="2" SnapsToDevicePixels="True"/>
<Rectangle HorizontalAlignment="Left" Width="1" Margin="29,2,0,2" Fill="#E2E3E3" SnapsToDevicePixels="True"/>
<Rectangle HorizontalAlignment="Left" Width="1" Margin="30,2,0,2" Fill="White" SnapsToDevicePixels="True"/>
<StackPanel>
<MenuItem Header="Item1"></MenuItem>
<MenuItem Header="Item2"></MenuItem>
<MenuItem Header="Item3"></MenuItem>
</StackPanel>
</Grid>
</ScrollViewer>
</Border>
</theme:SystemDropShadowChrome>
</Popup>
<Button.Triggers>
<EventTrigger RoutedEvent="MouseRightButtonUp">
<BeginStoryboard>
<Storyboard>
<BooleanAnimationUsingKeyFrames Storyboard.TargetName="popup" Storyboard.TargetProperty="IsOpen">
<DiscreteBooleanKeyFrame KeyTime="00:00:00.1" Value="True"/>
</BooleanAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Button.Triggers>
</Button>
</ScrollViewer>
如果要使用PresentationFramework.Aero2.dll
,请记住添加对SystemDropShadowChrome
的引用。不幸的是,当涉及到WPF逻辑树时,上下文菜单弹出窗口并不是其主机的祖先。这意味着从上下文菜单到scrollviewer的事件冒泡不起作用,因此不会向scrollviewer通知任何鼠标滚轮活动。但是,如果您只想在scrollviewer中向上/向下滚动,则可以通过侦听上下文菜单上的MouseWheel事件然后手动滚动ScrollViewer来轻松复制自己的行为。
例如xaml:
<ScrollViewer Height="500" x:Name="MyScrollViewer"> <Button Height = "2000"> <Button.ContextMenu> <ContextMenu x:Name="MyContextMenu"> <MenuItem Header="Item1"></MenuItem> <MenuItem Header="Item2"></MenuItem> <MenuItem Header="Item3"></MenuItem> </ContextMenu> </Button.ContextMenu> </Button> </ScrollViewer>
在您后面的代码中,您可以执行以下操作:
public MainWindow() { InitializeComponent(); this.MyContextMenu.MouseWheel += OnContextMenuMouseWheel; } private void OnContextMenuMouseWheel(object sender, MouseWheelEventArgs e) { var currentOffset = MyScrollViewer.VerticalOffset; var newOffset = currentOffset - e.Delta; MyScrollViewer.ScrollToVerticalOffset(newOffset); e.Handled = true; }