Question

我有一个按钮，单击它会打开一个上下文菜单。我在同一个堆栈面板上有另一个按钮，当通过按钮2打开上下文菜单时，单击按钮1不会第一次触发按钮1的事件，但是当再次点击时，事件被触发。简单来说，当按钮2的上下文菜单打开时，我需要点击2次才能触发窗口上按钮1的事件。

以下是更多理解的代码：

MainWindow.xaml

<Grid MouseLeftButtonDown="Grid_MouseLeftButtonDown">  
        <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions> 
<StackPanel Grid.Row = "0" Orientation="Horizontal">
       <Button x:Name= "btnOne" Click="btnOneClick"/>  
       <Button x:Name="btnTwo" 
                            RenderOptions.BitmapScalingMode="HighQuality" Cursor="Hand"  ContextMenuService.IsEnabled="False" Click="btnTwoClick">
                        <Button.Triggers>
                            <EventTrigger RoutedEvent="Button.Click">
                                <EventTrigger.Actions>
                                    <BeginStoryboard>
                                        <Storyboard>
                                            <BooleanAnimationUsingKeyFrames 
                                 Storyboard.TargetName="MyContextMenu" 
                                 Storyboard.TargetProperty="IsOpen">
                                                <DiscreteBooleanKeyFrame KeyTime="0:0:0" Value="True" />
                                            </BooleanAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </BeginStoryboard>
                                </EventTrigger.Actions>
                            </EventTrigger>
                        </Button.Triggers>
                        <StackPanel>
                            <StackPanel  Height="{Binding ActualHeight, ElementName=btnTwo}" Orientation="Horizontal" HorizontalAlignment="Right" >
                                <TextBlock  HorizontalAlignment="Right" Text="Click Me" ></TextBlock>                         
                            </StackPanel>                            
                        </StackPanel>
                        <Button.ContextMenu>
                            <ContextMenu x:Name="MyContextMenu"  StaysOpen="False"  Width="200" MaxHeight="258"
                                         BorderBrush="Gray" BorderThickness="1,0,1,1" Closed="MyContextMenuClosed">
                                <MenuItem Header="MenuOne" StaysOpenOnClick="True" Cursor="Arrow"/>
                                <MenuItem Header="MenuTwo" StaysOpenOnClick="True" Cursor="Arrow"/>                                                               
                            </ContextMenu>
                        </Button.ContextMenu>
                    </Button>
</StackPanel>
</Grid>

MainWindow.xaml.cs

//When user clicks anywhere on the Grid
 private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {              
            //Close the Context menu if it's open
            if (btnTwo.ContextMenu.IsOpen)
                btnTwo.ContextMenu.IsOpen = false;
        }


    //When user clicks on btnTwo
    private void btnTwoClick(object sender, RoutedEventArgs e)
        {
            if (!btnTwo.ContextMenu.IsOpen)
            {
                //Open the Context menu when Button is clicked
                btnTwo.ContextMenu.IsEnabled = true;
                btnTwo.ContextMenu.PlacementTarget = (sender as Button);
                btnTwo.ContextMenu.Placement = System.Windows.Controls.Primitives.PlacementMode.Bottom;
                btnTwo.ContextMenu.IsOpen = true;

            }              
        }

 //When user clicks on btnOne, This event does does not fires when context menu is open
 private void btnOneClick(object sender, RoutedEventArgs e)
        {

        }

Answer 1

我无法解释，但是，如果你删除

StaysOpen="False"

在XAML中的ContextMenu定义中，它将按预期的那样工作。顺便说一下 - 你不需要在XAML按钮的触发器和Click EventHandler中调用两次ContextMenu。

默认情况下，MSDN写入StaysOpen为false。

如果菜单应保持打开，直到IsOpen属性更改为假;否则，错误。默认值为false。

当上下文菜单打开时，单击一下就不会触及上下文菜单外的控件

1 个答案: