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How to change the color of drag line indicator in WPF TreeGrid?
11 mins read
By default, WPF TreeGrid (SfTreeGrid) does not provide the direct support to change the color of drag line indicator. You can change the color of drag line indicator by overriding the TreeGridHeaderRowControl and TreeGridRowControl Template.
<LinearGradientBrush x:Key="HeaderBackgroundBrush"
StartPoint="0,0"
EndPoint="1,1" >
<GradientStop Color="Transparent" Offset="0" />
<GradientStop Color="Transparent" Offset="1" />
</LinearGradientBrush>
<SolidColorBrush x:Key="HeaderBorderBrush" Color="Gray" />
<SolidColorBrush x:Key="ContentBorderBrush" Color="Gray" />
<Style TargetType="syncfusion:TreeGridHeaderRowControl">
<Setter Property="Background" Value="{StaticResource HeaderBackgroundBrush}" />
<Setter Property="BorderBrush" Value="{StaticResource HeaderBorderBrush}" />
<Setter Property="BorderThickness" Value="0" />
<Setter Property="IsTabStop" Value="False" />
<Setter Property="syncfusion:VisualContainer.WantsMouseInput" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="syncfusion:TreeGridHeaderRowControl">
<Grid>
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
SnapsToDevicePixels="True">
<ContentPresenter />
</Border>
<Border x:Name="PART_DragLineIndicator"
BorderBrush="Red"
Visibility="Collapsed"
BorderThickness="0,0,0,2" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="syncfusion:TreeGridRowControl">
<Setter Property="BorderBrush" Value="{StaticResource ContentBorderBrush}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="syncfusion:TreeGridRowControl">
<Grid>
<Border x:Name="PART_BackgroundBorder"
Margin="{TemplateBinding IndentMargin}"
Background="{TemplateBinding Background}"
Visibility="Visible">
<Rectangle x:Name="PART_FocusRect"
Margin="1,2,2,2"
Fill="Transparent"
Stroke="DarkGray"
StrokeDashArray="2,2"
StrokeThickness="1"
Visibility="Collapsed" />
</Border>
<Border x:Name="PART_SelectionBorder"
Margin="{TemplateBinding IndentMargin}"
Background="{TemplateBinding SelectionBackground}"
Visibility="Collapsed" />
<ContentPresenter />
<Border x:Name="PART_DragLineIndicator"
BorderBrush="Red"
Visibility="Collapsed"
BorderThickness="0,0,0,2" />
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="SelectionStates">
<VisualState x:Name="Unselected" />
<VisualState x:Name="Selected">
<Storyboard>
<ObjectAnimationUsingKeyFrames
BeginTime="00:00:00"
Storyboard.TargetName="PART_SelectionBorder"
Storyboard.TargetProperty="(UIElement.Visibility)">
<DiscreteObjectKeyFrame KeyTime="00:00:00"
Value="{x:Static Visibility.Visible}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="SelectedPointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames
BeginTime="00:00:00"
Storyboard.TargetName="PART_SelectionBorder"
Storyboard.TargetProperty="UIElement.Visibility)">
<DiscreteObjectKeyFrame KeyTime="00:00:00"
Value="{x:Static Visibility.Visible}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="SelectedPressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames
BeginTime="00:00:00"
Storyboard.TargetName="PART_SelectionBorder"
Storyboard.TargetProperty="UIElement.Visibility)">
<DiscreteObjectKeyFrame KeyTime="00:00:00"
Value="{x:Static Visibility.Visible}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="UnselectedPointerOver" />
<VisualState x:Name="UnselectedPressed" />
<VisualState x:Name="Focused">
<Storyboard>
<ObjectAnimationUsingKeyFrames
BeginTime="00:00:00"
Storyboard.TargetName="PART_FocusRect"
Storyboard.TargetProperty="UIElement.Visibility)">
<DiscreteObjectKeyFrame KeyTime="00:00:00"
Value="{x:Static Visibility.Visible}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
The following screenshot shows the drag line indicator color changed,
Conclusion
I hope you enjoyed learning about how to change the color of drag line indicator in TreeGrid.
You can refer to our WPF TreeGrid feature tour page to know about its other groundbreaking feature representations. You can also explore documentation to understand how to create and manipulate data.
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