如何获取滑块在样式中的拇指位置？我想显示拇指位置的实际值。这可以通过根据该值更改以下文本块的宽度来实现。但是如何获得拇指的位置呢？
<TextBlock Grid.Column="0" Width="THUMB POSITION" HorizontalAlignment="Right" Grid.Row="0" Text="{Binding Path=Value, RelativeSource={RelativeSource TemplatedParent}}"></TextBlock>
完整的样式如下所示：
<Style x:Key="MyCustomStyleForSlider" TargetType="{x:Type Slider}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Slider}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto" MinHeight="{TemplateBinding MinHeight}"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto" MinWidth="{TemplateBinding MinWidth}"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Grid.Row="0" Text="{Binding Path=Value, RelativeSource={RelativeSource TemplatedParent}}"></TextBlock>
<TextBlock Grid.Column="0" Grid.Row="1" Text="{Binding Path=Minimum, RelativeSource={RelativeSource TemplatedParent}}"></TextBlock>
<TextBlock Grid.Column="2" Grid.Row="1" Text="{Binding Path=Maximum, RelativeSource={RelativeSource TemplatedParent}}"></TextBlock>
<TickBar Grid.Column="1" x:Name="TopTick" Visibility="Visible" Fill="LightGray" Placement="Top" Height="6" Grid.Row="1"/>
<TickBar Grid.Column="1" x:Name="BottomTick" Visibility="Collapsed" Fill="Green" Placement="Bottom" Height="4" Grid.Row="0"/>
<Border x:Name="TrackBackground" BorderThickness="1" CornerRadius="1" Margin="5,0" VerticalAlignment="Center" Height="4.0" Grid.Row="1" >
<Canvas Margin="-6,-1">
<Rectangle Visibility="Visible" x:Name="PART_SelectionRange" Height="4.0" Fill="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}" Stroke="{DynamicResource {x:Static SystemColors.ControlDarkDarkBrushKey}}" StrokeThickness="1.0"/>
</Canvas>
</Border>
<Track x:Name="PART_Track" Grid.Row="1" Grid.Column="1">
<Track.DecreaseRepeatButton>
<RepeatButton Style="{StaticResource SliderRepeatButtonStyle}" BorderBrush="Transparent" Background="Transparent" Foreground="Transparent" Command="{x:Static Slider.DecreaseLarge}"/>
</Track.DecreaseRepeatButton>
<Track.IncreaseRepeatButton>
<RepeatButton Style="{StaticResource SliderRepeatButtonStyle}" Background="Transparent" Foreground="Transparent" BorderBrush="Transparent" Command="{x:Static Slider.IncreaseLarge}"/>
</Track.IncreaseRepeatButton>
<Track.Thumb>
<!--<Thumb x:Name="Thumb" Background="Black"/>-->
<Thumb x:Name="Thumb" Style="{StaticResource CustomThumbForSlider}" Background="Black"/>
</Track.Thumb>
</Track>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
我现在找到了解决方案。我使用减少RepeatButton的ActualWidth来获取拇指的位置。由于存在一些偏移，我只需要一个转换器，但它可以在没有任何代码的情况下工作。
Code:
<TextBlock Grid.Column="1" Grid.Row="0" TextAlignment="Right" Foreground="#3B3833"
HorizontalAlignment="Left" Width="{Binding Path=ActualWidth, ElementName=leftToggle,
Converter={StaticResource SliderConverter}, ConverterParameter=140}" Text="{Binding
Path=Value, RelativeSource={RelativeSource TemplatedParent}}"></TextBlock>
Preview:
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