WPF PreviewMouse 事件不起作用

Question

使用以下代码在附加到进程时出现一些奇怪的行为。每个按钮都有 Mouseup 和 Mousedown。在正常运行上，只有 MouseDown 起作用，而 MouseUp 被跳过。如果我在 MouseUp 中放置一个断点，它仍然会被跳过。在 MouseDown 中放置一个断点，然后两个事件都起作用。有什么想法或不同的方法吗？

private void Window_Load(object sender, RoutedEventArgs e)
{
    TelescopeHardware.Start();
    TelescopeHardware.StaticPropertyChanged += PropertyChanged;

    ButtonLeft.PreviewMouseLeftButtonUp += (s, ev) => { SetPulseGuideParms(0.0, -GuideRate); };
    ButtonLeft.PreviewMouseLeftButtonDown += (s, ev) => { StartSlew(SlewDirection.SlewLeft); };

    ButtonRight.PreviewMouseLeftButtonUp += (s, ev) => { SetPulseGuideParms(0.0, GuideRate); };
    ButtonRight.PreviewMouseLeftButtonDown += (s, ev) => { StartSlew(SlewDirection.SlewRight); };

    ButtonUp.PreviewMouseLeftButtonUp += (s, ev) => { SetPulseGuideParms(GuideRate, 0.0); };
    ButtonUp.PreviewMouseLeftButtonDown += (s, ev) => { StartSlew(SlewDirection.SlewUp); };

    ButtonDown.PreviewMouseLeftButtonUp += (s, ev) => { SetPulseGuideParms(-GuideRate, 0.0); };
    ButtonDown.PreviewMouseLeftButtonDown += (s, ev) => { StartSlew(SlewDirection.SlewDown); };

    ButtonStop.PreviewMouseLeftButtonDown += (s, ev) => { TelescopeHardware.AbortSlew(); };

    SlewSpeed_Load();
    Version_Load();
    EquatorialSystem_Load();
    GetTrackingRates();
}

这是一个按钮的 Xaml...

<Button Grid.Column="0" Grid.Row="1" Margin="2,2,2,2">
    <Rectangle x:Name="ButtonLeft" Fill="{StaticResource Arrow-Left-Bold-Circle}" Height="32" Width="32" />
</Button>

Answer 1

如果您将 Button 替换为另一个不处理鼠标点击的元素，例如 Border:

，您的代码将按预期工作

<Border Grid.Column="0" Grid.Row="1" Margin="2,2,2,2" BorderThickness="1">
    <Rectangle x:Name="ButtonLeft" Fill="{StaticResource Arrow-Left-Bold-Circle}" Height="32" Width="32" />
    <Border.Style>
        <Style TargetType="Border">
            <Setter Property="Background" Value="#FFDDDDDD"/>
            <Setter Property="BorderBrush" Value="#FF707070"/>
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="true">
                    <Setter Property="Background" Value="#FFBEE6FD"/>
                    <Setter Property="BorderBrush" Value="#FF3C7FB1"/>
                </Trigger>
            </Style.Triggers>
        </Style>
    </Border.Style>
</Border>

WPF PreviewMouse 事件不起作用

WPF PreviewMouse events not working

wpf

mouseevent