根据滑块增加文本的字体大小

Question

所以我的要求非常简单。我将有一个滑块控件和一个文本块。因此，无论何时增加或减少滑块，Textblock的字体大小都应该改变。我能够使用MVVM模式完成此任务。

我的问题是我需要在滑块下面显示一些文字，如小，中，低。好吧，我能够在线阅读一些文章说这可以使用TickBar完成。但问题是TickBar没有值更改事件，因此我可以触发对ViewModel的更改。

有人可以让我知道使用滑块完成此操作。我已经在google上阅读了一些样式，并且它会在滑块更改后立即显示数字。可以将其更改为小，中，低等文本。感谢。

<Style
            x:Key="SliderRepeatButton"
            TargetType="RepeatButton">
            <Setter
                Property="SnapsToDevicePixels"
                Value="true" />
            <Setter
                Property="OverridesDefaultStyle"
                Value="true" />
            <Setter
                Property="IsTabStop"
                Value="false" />
            <Setter
                Property="Focusable"
                Value="false" />
            <Setter
                Property="Template">
                <Setter.Value>
                    <ControlTemplate
                        TargetType="RepeatButton">
                        <Border
                            Background="Transparent" />
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <Style
            x:Key="SliderRepeatButton1"
            TargetType="RepeatButton">
            <Setter
                Property="SnapsToDevicePixels"
                Value="true" />
            <Setter
                Property="OverridesDefaultStyle"
                Value="true" />
            <Setter
                Property="Template">
                <Setter.Value>
                    <ControlTemplate
                        TargetType="RepeatButton">
                        <Border
                            SnapsToDevicePixels="True"
                            Background="YellowGreen"
                            BorderThickness="1"
                            BorderBrush="YellowGreen"
                            Height="3" />
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <Style
            x:Key="SliderThumb"
            TargetType="Thumb">
            <Setter
                Property="SnapsToDevicePixels"
                Value="true" />
            <Setter
                Property="OverridesDefaultStyle"
                Value="true" />
            <Setter
                Property="Template">
                <Setter.Value>
                    <ControlTemplate
                        TargetType="Thumb">
                        <StackPanel
                            Orientation="Vertical">
                            <Path
                                Data="M 0 0 L 8 0 L 4 6 Z"
                                Stroke="YellowGreen"
                                Margin="-2,0,0,0"
                                StrokeThickness="2"
                                Fill="YellowGreen"></Path>
                            <Line
                                X1="0"
                                Y1="0"
                                X2="0"
                                Y2="7"
                                Stroke="Gray"
                                StrokeThickness="1"
                                Margin="2,0,0,0"
                                StrokeDashArray="1.5,1.5"></Line>
                            <TextBlock
                                Foreground="Black"
                                Margin="-2,30,0,0"
                                Text="{Binding Value, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Slider}}}" />
                        </StackPanel>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <ControlTemplate
            x:Key="Slider"
            TargetType="Slider">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition
                        Height="Auto" />
                    <RowDefinition
                        Height="Auto"
                        MinHeight="{TemplateBinding MinHeight}" />
                    <RowDefinition
                        Height="Auto" />
                </Grid.RowDefinitions>
                <TickBar
                    x:Name="TopTick"
                    Fill="LightGray"
                    VerticalAlignment="Top"
                    SnapsToDevicePixels="True"
                    Grid.Row="0"
                    Placement="Top"
                    Height="5"
                    Visibility="Visible" />
                <Border
                    BorderBrush="LightGray"
                    BorderThickness="0,0,0,1"></Border>
                <Border
                    x:Name="TrackBackground"
                    VerticalAlignment="Center"
                    Margin="0,-10,0,0"
                    BorderBrush="Red"
                    Background="Red"
                    Height="3"
                    Grid.Row="1"
                    BorderThickness="1" />
                <Track
                    Grid.Row="1"
                    x:Name="PART_Track"
                    Margin="0,-10,0,0">
                    <Track.DecreaseRepeatButton>
                        <RepeatButton
                            Style="{StaticResource SliderRepeatButton1}"
                            Command="Slider.DecreaseLarge" />
                    </Track.DecreaseRepeatButton>
                    <Track.Thumb>
                        <Thumb
                            Style="{StaticResource SliderThumb}"
                            Margin="0,-20,0,0" />
                    </Track.Thumb>
                    <Track.IncreaseRepeatButton>
                        <RepeatButton
                            Style="{StaticResource SliderRepeatButton}"
                            Command="Slider.IncreaseLarge" />
                    </Track.IncreaseRepeatButton>
                </Track>
                <TextBlock
                    Text="0"
                    Grid.Row="1"
                    Margin="0,15,0,0"></TextBlock>
                <TickBar
                    x:Name="BottomTick"
                    Fill="LightGray"
                    SnapsToDevicePixels="True"
                    Grid.Row="2"
                    Placement="Bottom"
                    Height="4"
                    Visibility="Collapsed" />
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger
                    Property="TickPlacement"
                    Value="TopLeft">
                    <Setter
                        TargetName="TopTick"
                        Property="Visibility"
                        Value="Visible" />
                </Trigger>
                <Trigger
                    Property="TickPlacement"
                    Value="BottomRight">
                    <Setter
                        TargetName="BottomTick"
                        Property="Visibility"
                        Value="Visible" />
                </Trigger>
                <Trigger
                    Property="TickPlacement"
                    Value="Both">
                    <Setter
                        TargetName="TopTick"
                        Property="Visibility"
                        Value="Visible" />
                    <Setter
                        TargetName="BottomTick"
                        Property="Visibility"
                        Value="Visible" />
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>

        <Style
            x:Key="Horizontal_Slider"
            TargetType="Slider">
            <Setter
                Property="Focusable"
                Value="False" />
            <Setter
                Property="SnapsToDevicePixels"
                Value="true" />
            <Setter
                Property="OverridesDefaultStyle"
                Value="true" />
            <Style.Triggers>
                <Trigger
                    Property="Orientation"
                    Value="Horizontal">
                    <Setter
                        Property="MinHeight"
                        Value="21" />
                    <Setter
                        Property="MinWidth"
                        Value="104" />
                    <Setter
                        Property="Template"
                        Value="{StaticResource Slider}" />
                </Trigger>
            </Style.Triggers>
        </Style>