How to change WPF ScrollViewer RepeatButton Height and Width - wpf

Question

I would like to change the size of the RepeatButton UP and DOWN of a ScrollViewer, to get a touchable size on industrial touch panels.
How can I access these properties?
I was able to change the size of the ScrollViewer globally within a ResourceDictionary like this:
<Style x:Key="{x:Type ScrollBar}" TargetType="{x:Type ScrollBar}">
<Setter Property="Stylus.IsFlicksEnabled" Value="True" />
<Style.Triggers>
<Trigger Property="Orientation" Value="Horizontal">
<Setter Property="Height" Value="{StaticResource widthScrollbarNormal}" />
<Setter Property="MinHeight" Value="{StaticResource widthScrollbarNormal}" />
</Trigger>
<Trigger Property="Orientation" Value="Vertical">
<Setter Property="Width" Value="{StaticResource widthScrollbarNormal}" />
<Setter Property="MinWidth" Value="{StaticResource widthScrollbarNormal}" />
</Trigger>
</Style.Triggers>
But I cannot find the way to change the RepeatButton size.
Thanks

Answer 1

In yout view, in case if is datagrid, add this resource:
<DataGrid.Resources>
<Style TargetType="{x:Type ScrollBarStyle}" BasedOn="{StaticResource ScrollBarStyle}"/>
</DataGrid.Resources>
Then create all of this styles in styles file (if you don't have it, check how you can create and use one!!):
(add the normal one, the horizontal and the vertical!
Normal:
<!--scroll bar style (normal/large one)-->
<Style x:Key="ScrollBarStyle" 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="30"/>
<Setter Property="MinHeight" Value="0"/>
<Setter Property="Template" Value="{StaticResource HorizontalScrollBar}" />
</Trigger>
<Trigger Property="Orientation" Value="Vertical">
<Setter Property="Width" Value="30"/>
<Setter Property="MinWidth" Value="0"/>
<Setter Property="Height" Value="Auto" />
<Setter Property="Template" Value="{StaticResource VerticalScrollBar}" />
</Trigger>
</Style.Triggers>
</Style>
And for horizontal:
<!--horizontal scrollbar itself template (normal)-->
<ControlTemplate x:Key="HorizontalScrollBar" TargetType="{x:Type ScrollBar}">
<Grid >
<Grid.ColumnDefinitions>
<ColumnDefinition MaxWidth="30"/>
<ColumnDefinition Width="0.00001*"/>
<ColumnDefinition MaxWidth="30"/>
</Grid.ColumnDefinitions>
<Border
Grid.ColumnSpan="3"
CornerRadius="0"
Background="#F0F0F0" />
<RepeatButton
Grid.Column="0"
Style="{StaticResource ScrollBarLineButton}"
Width="Auto"
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="1,0,1,0"
Background="{DynamicResource NormalBrush}"
BorderBrush="Transparent" />
</Track.Thumb>
<Track.IncreaseRepeatButton>
<RepeatButton
Style="{StaticResource ScrollBarPageButton}"
Command="ScrollBar.PageRightCommand" />
</Track.IncreaseRepeatButton>
</Track>
<RepeatButton
Grid.Column="3"
Style="{StaticResource ScrollBarLineButton}"
Width="Auto"
Command="ScrollBar.LineRightCommand"
Content="M 0 0 L 4 4 L 0 8 Z"/>
</Grid>
</ControlTemplate>
And for vertical:
<!--vertical scrollbar itself template (normal)-->
<ControlTemplate x:Key="VerticalScrollBar" TargetType="{x:Type ScrollBar}">
<Grid >
<Grid.RowDefinitions>
<RowDefinition MaxHeight="30"/>
<RowDefinition Height="0.00001*"/>
<RowDefinition MaxHeight="30"/>
</Grid.RowDefinitions>
<Border
Grid.RowSpan="3"
CornerRadius="0"
Background="#F0F0F0" />
<RepeatButton
Grid.Row="0"
Style="{StaticResource ScrollBarLineButton}"
Height="Auto"
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="0,1,0,1"
Background="{DynamicResource NormalBrush}"
BorderBrush="Transparent" />
</Track.Thumb>
<Track.IncreaseRepeatButton>
<RepeatButton
Style="{StaticResource ScrollBarPageButton}"
Command="ScrollBar.PageDownCommand" />
</Track.IncreaseRepeatButton>
</Track>
<RepeatButton
Grid.Row="3"
Style="{StaticResource ScrollBarLineButton}"
Height="Auto"
Command="ScrollBar.LineDownCommand"
Content="M 0 0 L 4 4 L 8 0 Z"/>
</Grid>
</ControlTemplate>