.net - 样式化 XAML 滑块控件 - 如何停止在 PointerOver 上更改拇指背景？

Question

我正在尝试使用 XAML 为 Metro 风格应用程序重新设置 Slider 控件的样式 - 它应该看起来像用户沿着灰色条拖动的红色总线，即：

我已经使用 Visual Studio 提取了样式并重新设置了 Slider 控件的样式，如下所示。不幸的是，每当我将鼠标悬停在滑块上时，拇指就会被一个灰色矩形替换，即使我已经从 VisualState“PointerOver”组中专门删除了所有 Storyboard 项目。

我错过了什么？XAML 如下。如果我需要修改另一个模板（例如 Thumb？），那么请提供有关如何提取此模板的步骤，因为 Visual Studio 似乎除了下面的之外没有向我公开任何更多的控制模板。

    <Style x:Key="BusRouteSliderStyle" TargetType="Slider">
        <Setter Property="Background" Value="{StaticResource SliderTrackBackgroundThemeBrush}"/>
        <Setter Property="BorderBrush" Value="{StaticResource SliderBorderThemeBrush}"/>
        <Setter Property="BorderThickness" Value="{StaticResource SliderBorderThemeThickness}"/>
        <Setter Property="Foreground" Value="{StaticResource SliderTrackDecreaseBackgroundThemeBrush}"/>
        <Setter Property="ManipulationMode" Value="None"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Slider">
                    <Grid Margin="{TemplateBinding Padding}">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal"/>
                                <VisualState x:Name="Pressed">
                                    <Storyboard>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Disabled">
                                    <Storyboard>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="PointerOver">
                                    <Storyboard>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="FocusStates">
                                <VisualState x:Name="Focused">
                                    <Storyboard>
                                        <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="FocusVisualWhiteHorizontal"/>
                                        <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="FocusVisualBlackHorizontal"/>
                                        <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="FocusVisualWhiteVertical"/>
                                        <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="FocusVisualBlackVertical"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Unfocused"/>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Grid x:Name="HorizontalTemplate" Background="Transparent">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto"/>
                                <ColumnDefinition Width="Auto"/>
                                <ColumnDefinition Width="*"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="17"/>
                                <RowDefinition Height="30"/>
                                <RowDefinition Height="32"/>
                            </Grid.RowDefinitions>
                            <Rectangle x:Name="HorizontalTrackRect" Grid.ColumnSpan="3" Fill="LightGray" Grid.Row="1"
                                       Height="10" VerticalAlignment="Bottom"/>
                            <Rectangle x:Name="HorizontalDecreaseRect" Height="0" />
                            <TickBar x:Name="TopTickBar" Grid.ColumnSpan="3" Fill="{StaticResource SliderTickmarkOutsideBackgroundThemeBrush}" Height="{StaticResource SliderOutsideTickBarThemeHeight}" Margin="0,0,0,2" Visibility="Collapsed" VerticalAlignment="Bottom"/>
                            <TickBar x:Name="HorizontalInlineTickBar" Grid.ColumnSpan="3" Fill="{StaticResource SliderTickMarkInlineBackgroundThemeBrush}" Height="{StaticResource SliderTrackThemeHeight}" Grid.Row="1" Visibility="Collapsed"/>
                            <TickBar x:Name="BottomTickBar" Grid.ColumnSpan="3" Fill="{StaticResource SliderTickmarkOutsideBackgroundThemeBrush}" Height="{StaticResource SliderOutsideTickBarThemeHeight}" Margin="0,2,0,0" Grid.Row="2" Visibility="Collapsed" VerticalAlignment="Top"/>
                            <Rectangle x:Name="HorizontalBorder" Grid.ColumnSpan="3" Grid.Row="1" Stroke="{TemplateBinding BorderBrush}" StrokeThickness="{TemplateBinding BorderThickness}"/>
                            <Thumb x:Name="HorizontalThumb"  
                                   Grid.Column="1" 
                                   DataContext="{TemplateBinding Value}"
                                   Width="40"
                                   Height="30" 
                                   Grid.Row="1" >
                                <Thumb.Background>
                                    <ImageBrush ImageSource="/Assets/bus_thumb.png" />
                                </Thumb.Background>
                            </Thumb>
                            <Rectangle x:Name="FocusVisualWhiteHorizontal" Grid.ColumnSpan="3" IsHitTestVisible="False" Opacity="0" Grid.RowSpan="3" StrokeDashOffset="1.5" StrokeEndLineCap="Square" Stroke="{StaticResource FocusVisualWhiteStrokeThemeBrush}" StrokeDashArray="1,1"/>
                            <Rectangle x:Name="FocusVisualBlackHorizontal" Grid.ColumnSpan="3" IsHitTestVisible="False" Opacity="0" Grid.RowSpan="3" StrokeDashOffset="0.5" StrokeEndLineCap="Square" Stroke="{StaticResource FocusVisualBlackStrokeThemeBrush}" StrokeDashArray="1,1"/>
                        </Grid>
                        <Grid x:Name="VerticalTemplate" Background="Transparent" Visibility="Collapsed">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="17"/>
                                <ColumnDefinition Width="Auto"/>
                                <ColumnDefinition Width="17"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*"/>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="Auto"/>
                            </Grid.RowDefinitions>
                            <Rectangle x:Name="VerticalTrackRect" Grid.Column="1" Fill="{TemplateBinding Background}" Grid.RowSpan="3"/>
                            <Rectangle x:Name="VerticalDecreaseRect" Grid.Column="1" Fill="{TemplateBinding Foreground}" Grid.Row="2"/>
                            <TickBar x:Name="LeftTickBar" Fill="{StaticResource SliderTickmarkOutsideBackgroundThemeBrush}" HorizontalAlignment="Right" Margin="0,0,2,0" Grid.RowSpan="3" Visibility="Collapsed" Width="{StaticResource SliderOutsideTickBarThemeHeight}"/>
                            <TickBar x:Name="VerticalInlineTickBar" Grid.Column="1" Fill="{StaticResource SliderTickMarkInlineBackgroundThemeBrush}" Grid.RowSpan="3" Visibility="Collapsed" Width="{StaticResource SliderTrackThemeHeight}"/>
                            <TickBar x:Name="RightTickBar" Grid.Column="2" Fill="{StaticResource SliderTickmarkOutsideBackgroundThemeBrush}" HorizontalAlignment="Left" Margin="2,0,0,0" Grid.RowSpan="3" Visibility="Collapsed" Width="{StaticResource SliderOutsideTickBarThemeHeight}"/>
                            <Rectangle x:Name="VerticalBorder" Grid.Column="1" Grid.RowSpan="3" Stroke="{TemplateBinding BorderBrush}" StrokeThickness="{TemplateBinding BorderThickness}"/>
                            <Thumb x:Name="VerticalThumb" 
                                Background="{StaticResource SliderThumbBackgroundThemeBrush}" 
                                Grid.Column="1" DataContext="{TemplateBinding Value}" Height="{StaticResource SliderTrackThemeHeight}" Grid.Row="1" 
                                Width="{StaticResource SliderTrackThemeHeight}"/>
                            <Rectangle x:Name="FocusVisualWhiteVertical" Grid.ColumnSpan="3" IsHitTestVisible="False" Opacity="0" Grid.RowSpan="3" StrokeDashOffset="1.5" StrokeEndLineCap="Square" Stroke="{StaticResource FocusVisualWhiteStrokeThemeBrush}" StrokeDashArray="1,1"/>
                            <Rectangle x:Name="FocusVisualBlackVertical" Grid.ColumnSpan="3" IsHitTestVisible="False" Opacity="0" Grid.RowSpan="3" StrokeDashOffset="0.5" StrokeEndLineCap="Square" Stroke="{StaticResource FocusVisualBlackStrokeThemeBrush}" StrokeDashArray="1,1"/>
                        </Grid>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</UserControl.Resources>

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="50" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>

    <Slider x:Name="busSlider" Width="220" Height="50" Minimum="0" Maximum="100" Value="0" Orientation="Horizontal" IsEnabled="True"  Style="{StaticResource BusRouteSliderStyle}" />

    <TextBlock x:Name="lblSliderStopInfo" Grid.Row="1" Foreground="White" FontSize="12" Text ="{Binding ElementName=slider,  Path=Value}" />

</Grid>

Answer 1

您可能还需要更改 Thumb 控件的样式/模板。

Answer 2

正如我所怀疑的，我需要更改 Thumb 控件的样式，但在 VIsual Studio 中提取它并不容易，因为它已经包含在 ControlTemplate 中。

解决方案如下：

• 在空白 XAML 页面上创建一个全新的 Thumb 控件，为其指定高度/宽度，使其在设计器画布上可见。
• 右键单击它，选择“编辑模板”->“编辑副本”
• 这会在 XAML 中创建模板，然后可以根据需要将其复制/粘贴到其他地方。

默认的 Thumb 样式粘贴在下面，供任何需要的人使用。只需删除 PointerOver 和 Pressed 状态即可实现我想要的行为。

  <Style x:Key="ThumbStyle1" TargetType="Thumb">
        <Setter Property="Background" Value="{StaticResource ThumbBackgroundThemeBrush}"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="IsTabStop" Value="False"/>
        <Setter Property="BorderBrush" Value="{StaticResource ThumbBorderThemeBrush}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Thumb">
                    <Grid>
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal"/>
                                <VisualState x:Name="PointerOver">
                                    <Storyboard>
                                        <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="BackgroundPointerOver"/>
                                        <DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Background"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Pressed">
                                    <Storyboard>
                                        <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="BackgroundPressed"/>
                                        <DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Background"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Disabled"/>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="FocusStates">
                                <VisualState x:Name="Unfocused"/>
                                <VisualState x:Name="Focused"/>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Border x:Name="Background" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}"/>
                        <Border x:Name="BackgroundPointerOver" BorderBrush="{StaticResource ThumbPointerOverBorderThemeBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{StaticResource ThumbPointerOverBackgroundThemeBrush}" Opacity="0"/>
                        <Border x:Name="BackgroundPressed" BorderBrush="{StaticResource ThumbPressedBorderThemeBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{StaticResource ThumbPressedBackgroundThemeBrush}" Opacity="0"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>