How to change the width of the vertical scrollbar in WPF TreeView (SfTreeView)?
WPF TreeView (SfTreeView), doesn’t have any direct property to change the width of the vertical scrollbar. However, you can change it by increasing the width of the ScrollViewer in the SfTreeView template by creating Style with TargetType as SfTreeView.
<Window.Resources>
<DataTemplate x:Key="endExpanderTemplate">
<Grid x:Name="grid"
Width="{TemplateBinding Width}"
Background="Transparent" >
<Path x:Name="PART_CollapseCellPath"
Width="6.061"
Height="8.706"
Data="M5.6040074,0 L6.2710001,0.74499984 1.5000009,5.0119996 6.2529947,9.2629985 5.5860021,10.007999 0,5.0119996 z"
Stretch="Uniform"
Fill="#6D6D6D" />
<Path x:Name="PART_ExpanderCellPath"
Width="8.706"
Height="6.061"
Data="M0.74499548,0 L5.0119957,4.7700001 9.2630047,0.017000169 10.008001,0.68400005 5.0119957,6.2700001 0,0.66699985 z"
Stretch="Uniform"
Fill="#6D6D6D"/>
</Grid>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding IsExpanded}" Value="True">
<Setter Property="Visibility" TargetName="PART_ExpanderCellPath" Value="Visible"/>
<Setter Property="Visibility" TargetName="PART_CollapseCellPath" Value="Collapsed"/>
</DataTrigger>
<DataTrigger Binding="{Binding IsExpanded}" Value="False">
<Setter Property="Visibility" TargetName="PART_ExpanderCellPath" Value="Collapsed"/>
<Setter Property="Visibility" TargetName="PART_CollapseCellPath" Value="Visible"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
<Style TargetType="syncfusion:SfTreeView" x:Key="SfTreeViewStyle_ScrollBarWidth">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="syncfusion:SfTreeView">
<Grid Background="{TemplateBinding Background}">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
SnapsToDevicePixels="True">
<ScrollViewer x:Name="PART_ScrollViewer"
Background="Transparent"
CanContentScroll="True"
IsTabStop="False"
FlowDirection="{TemplateBinding FlowDirection}"
HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
IsDeferredScrollingEnabled="{TemplateBinding ScrollViewer.IsDeferredScrollingEnabled}"
PanningMode="{TemplateBinding ScrollViewer.PanningMode}"
PanningRatio="{TemplateBinding ScrollViewer.PanningRatio}"
VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}">
<syncfusion:TreeNodeContainer x:Name="PART_TreeNodeContainer"
HorizontalAlignment="Left"
Background="Transparent"/>
<ScrollViewer.Resources>
<sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">50</sys:Double>
</ScrollViewer.Resources>
</ScrollViewer>
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ExpanderPosition" Value="End">
<Setter Property="ExpanderTemplate" Value="{StaticResource endExpanderTemplate}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
Take a moment to peruse the documentation, where you can find about styling in SfTreeView, with code examples.
You can download the example from GitHub
Conclusion
I hope you enjoyed learning about how to change the width of the vertical scrollbar in WPF TreeView (SfTreeView).
You can refer to our WPF TreeView feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications.
For current customers, you can check out our Document Processing Libraries from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our controls.
If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-trac, or feedback portal. We are always happy to assist you!
