C# WPF Scrollbar - Repeat Buttons-CodePudding

I would like to change my scrollbar design. I have already changed a few things, but I can't get any further. Ive used this question

Current Scrollbar

<SolidColorBrush x:Key="DisabledForegroundBrush" Color="#888" />
    <SolidColorBrush x:Key="GlyphBrush" Color="#444" />
    <SolidColorBrush x:Key="NormalBrush" Color="#888" />
    <SolidColorBrush x:Key="NormalBorderBrush" Color="#888" />
    <SolidColorBrush x:Key="HorizontalNormalBrush" Color="#FF686868" />
    <SolidColorBrush x:Key="HorizontalNormalBorderBrush" Color="#888" />

    <LinearGradientBrush x:Key="ListBoxBackgroundBrush" StartPoint="0,0" EndPoint="1,0.001">
        <GradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="White" Offset="0.0" />
                <GradientStop Color="White" Offset="0.6" />
                <GradientStop Color="#DDDDDD" Offset="1.2"/>
            </GradientStopCollection>
        </GradientBrush.GradientStops>
    </LinearGradientBrush>
    <LinearGradientBrush x:Key="StandardBrush" StartPoint="0,0" EndPoint="0,1">
        <GradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="#FFF" Offset="0.0"/>
                <GradientStop Color="#CCC" Offset="1.0"/>
            </GradientStopCollection>
        </GradientBrush.GradientStops>
    </LinearGradientBrush>
    <LinearGradientBrush x:Key="PressedBrush" StartPoint="0,0" EndPoint="0,1">
        <GradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="#BBB" Offset="0.0"/>
                <GradientStop Color="#EEE" Offset="0.1"/>
                <GradientStop Color="#EEE" Offset="0.9"/>
                <GradientStop Color="#FFF" Offset="1.0"/>
            </GradientStopCollection>
        </GradientBrush.GradientStops>
    </LinearGradientBrush>

    <Style x:Key="ScrollBarLineButton" TargetType="{x:Type RepeatButton}">
        <Setter Property="Visibility" Value="Hidden"/>
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RepeatButton}">
                    <Border Name="Border" Margin="1" CornerRadius="4" Background="{StaticResource NormalBrush}" BorderBrush="{StaticResource NormalBorderBrush}" BorderThickness="1">
                        <Path HorizontalAlignment="Center" VerticalAlignment="Center" Fill="{StaticResource GlyphBrush}" Data="{Binding Path=Content, RelativeSource={RelativeSource TemplatedParent}}" />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsPressed" Value="true">
                            <Setter TargetName="Border" Property="Background" Value="{StaticResource PressedBrush}" />
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="ScrollBarPageButton" TargetType="{x:Type RepeatButton}">
        <Setter Property="Visibility" Value="Hidden"/>
        <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="{x:Type RepeatButton}">
                    <Border Background="Black" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style x:Key="ScrollBarThumb" TargetType="{x:Type Thumb}">
        <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="{x:Type Thumb}">
                    <Border CornerRadius="4" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="0"  Width="8" Margin="0"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <ControlTemplate x:Key="VerticalScrollBar" TargetType="{x:Type ScrollBar}">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition MaxHeight="0"/>
                <RowDefinition Height="0.00001*"/>
                <RowDefinition MaxHeight="0"/>
            </Grid.RowDefinitions>
            <Border Grid.RowSpan="3" CornerRadius="4" Background="LightGray" Width="8" Margin="0, 0, 5 ,0"/>
            <RepeatButton Grid.Row="0" Style="{StaticResource ScrollBarLineButton}" Height="18"  Command="ScrollBar.LineUpCommand" Content="M 0 4 L 8 4 L 4 0 Z" />
            <Track Name="PART_Track" Grid.Row="1" IsDirectionReversed="true">
                <Track.DecreaseRepeatButton>
                    <RepeatButton Style="{StaticResource ScrollBarPageButton}" Command="ScrollBar.PageUpCommand" />
                </Track.DecreaseRepeatButton>
                <Track.Thumb>
                    <Thumb Style="{StaticResource ScrollBarThumb}" Margin="0,0,5,0" Background="{StaticResource HorizontalNormalBrush}" BorderBrush="{StaticResource HorizontalNormalBorderBrush}" />
                </Track.Thumb>
                <Track.IncreaseRepeatButton>
                    <RepeatButton Style="{StaticResource ScrollBarPageButton}" Command="ScrollBar.PageDownCommand" />
                </Track.IncreaseRepeatButton>
            </Track>
            <RepeatButton Grid.Row="3" Style="{StaticResource ScrollBarLineButton}" Height="18" Command="ScrollBar.LineDownCommand" Content="M 0 0 L 4 4 L 8 0 Z"/>
        </Grid>
    </ControlTemplate>
    <ControlTemplate x:Key="HorizontalScrollBar" TargetType="{x:Type ScrollBar}">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition MaxWidth="18"/>
                <ColumnDefinition Width="0.00001*"/>
                <ColumnDefinition MaxWidth="18"/>
            </Grid.ColumnDefinitions>
            <Border Grid.ColumnSpan="3" CornerRadius="2" Background="#F0F0F0"/>
            <RepeatButton Grid.Column="0"  Style="{StaticResource ScrollBarLineButton}" Width="8" Command="ScrollBar.LineLeftCommand" Content="M 4 0 L 4 8 L 0 4 Z" />
            <Track Name="PART_Track" Grid.Column="1" IsDirectionReversed="False">
                <Track.DecreaseRepeatButton>
                    <RepeatButton Style="{StaticResource ScrollBarPageButton}" Command="ScrollBar.PageLeftCommand" />
                </Track.DecreaseRepeatButton>
                <Track.Thumb>
                    <Thumb Style="{StaticResource ScrollBarThumb}" Margin="0,1,0,1" Background="{StaticResource NormalBrush}" BorderBrush="{StaticResource NormalBorderBrush}" />
                </Track.Thumb>
                <Track.IncreaseRepeatButton>
                    <RepeatButton Style="{StaticResource ScrollBarPageButton}" Command="ScrollBar.PageRightCommand" />
                </Track.IncreaseRepeatButton>
            </Track>
            <RepeatButton Grid.Column="3" Style="{StaticResource ScrollBarLineButton}" Width="8" Command="ScrollBar.LineRightCommand" Content="M 0 0 L 4 4 L 0 8 Z"/>
        </Grid>
    </ControlTemplate>
    <Style x:Key="{x:Type ScrollBar}" TargetType="{x:Type ScrollBar}">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Style.Triggers>
            <Trigger Property="Orientation" Value="Horizontal">
                <Setter Property="Width" Value="Auto"/>
                <Setter Property="Height" Value="18" />
                <Setter Property="Template" Value="{StaticResource HorizontalScrollBar}" />
            </Trigger>
            <Trigger Property="Orientation" Value="Vertical">
                <Setter Property="Width" Value="18"/>
                <Setter Property="Height" Value="Auto" />
                <Setter Property="Template" Value="{StaticResource VerticalScrollBar}" />
            </Trigger>
        </Style.Triggers>
    </Style>

    <Style x:Key="FavsScrollViewer" TargetType="{x:Type ScrollViewer}">
        <Setter Property="OverridesDefaultStyle" Value="True"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ScrollViewer}">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition/>
                        </Grid.ColumnDefinitions>
                        <Grid.RowDefinitions>
                            <RowDefinition/>
                            <RowDefinition Height="Auto"/>
                        </Grid.RowDefinitions>
                        <ScrollContentPresenter Grid.Column="1"/>
                        <ScrollBar Name="PART_VerticalScrollBar" Value="{TemplateBinding VerticalOffset}" Maximum="{TemplateBinding ScrollableHeight}" ViewportSize="{TemplateBinding ViewportHeight}" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"/>
                        <ScrollBar Name="PART_HorizontalScrollBar" Orientation="Horizontal" Grid.Row="1" Grid.Column="1" Value="{TemplateBinding HorizontalOffset}" Maximum="{TemplateBinding ScrollableWidth}" ViewportSize="{TemplateBinding ViewportWidth}" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

CodePudding user response：

In VerticalScrollBar template you have <RowDefinition MaxHeight="0"/>. So row with button has 0 height.

CodePudding user response：

Set the Visibility of the RepeatButton to Visible in the "ScrollBarLineButton" Style
Set the Height of the RowDefinitions in the "VerticalScrollBar" Style

Also set the Grid.Row attached property of the last RepeatButton to 2 in in the "VerticalScrollBar" Style:

  <Style x:Key="ScrollBarLineButton" TargetType="{x:Type RepeatButton}">
      <Setter Property="Visibility" Value="Visible"/>
      <Setter Property="SnapsToDevicePixels" Value="True"/>
      <Setter Property="OverridesDefaultStyle" Value="true"/>
      <Setter Property="Focusable" Value="false"/>
      <Setter Property="Template">
          <Setter.Value>
              <ControlTemplate TargetType="{x:Type RepeatButton}">
                  <Border Name="Border" Margin="1" CornerRadius="4" Background="{StaticResource NormalBrush}" BorderBrush="{StaticResource NormalBorderBrush}" BorderThickness="1">
                      <Path HorizontalAlignment="Center" VerticalAlignment="Center" Fill="{StaticResource GlyphBrush}" Data="{Binding Path=Content, RelativeSource={RelativeSource TemplatedParent}}" />
                  </Border>
                  <ControlTemplate.Triggers>
                      <Trigger Property="IsPressed" Value="true">
                          <Setter TargetName="Border" Property="Background" Value="{StaticResource PressedBrush}" />
                      </Trigger>
                      <Trigger Property="IsEnabled" Value="false">
                          <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
                      </Trigger>
                  </ControlTemplate.Triggers>
              </ControlTemplate>
          </Setter.Value>
      </Setter>
  </Style>

  <ControlTemplate x:Key="VerticalScrollBar" TargetType="{x:Type ScrollBar}">
      <Grid>
          <Grid.RowDefinitions>
              <RowDefinition Height="Auto" />
              <RowDefinition Height="0.00001*"/>
              <RowDefinition Height="Auto"/>
          </Grid.RowDefinitions>
          <Border Grid.RowSpan="3" CornerRadius="4" Background="LightGray" Width="8" Margin="0, 0, 5 ,0"/>
          <RepeatButton Grid.Row="0" Style="{StaticResource ScrollBarLineButton}" Height="18"  Command="ScrollBar.LineUpCommand" Content="M 0 4 L 8 4 L 4 0 Z" />
          <Track Name="PART_Track" Grid.Row="1" IsDirectionReversed="true">
              <Track.DecreaseRepeatButton>
                  <RepeatButton Style="{StaticResource ScrollBarPageButton}" Command="ScrollBar.PageUpCommand" />
              </Track.DecreaseRepeatButton>
              <Track.Thumb>
                  <Thumb Style="{StaticResource ScrollBarThumb}" Margin="0,0,5,0" Background="{StaticResource HorizontalNormalBrush}" BorderBrush="{StaticResource HorizontalNormalBorderBrush}" />
              </Track.Thumb>
              <Track.IncreaseRepeatButton>
                  <RepeatButton Style="{StaticResource ScrollBarPageButton}" Command="ScrollBar.PageDownCommand" />
              </Track.IncreaseRepeatButton>
          </Track>
          <RepeatButton Grid.Row="2" Style="{StaticResource ScrollBarLineButton}" Height="18" Command="ScrollBar.LineDownCommand" Content="M 0 0 L 4 4 L 8 0 Z"/>
      </Grid>
  </ControlTemplate>