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Highlight whole TreeViewItem line in WPF

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暗喜 2020-11-30 17:48

If I set TreeViewItem Background it highlights the header only. How can I highlight the whole line?

I have found a post almost solving a problem http://social.msdn.

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9条回答
  • 陌清茗
    2020-11-30 18:50

    If you mean something like this screenshot


    (source: bendewey.com)

    Update As noted this example has the downfall of being indented on the subitems


    (source: bendewey.com)

    Then this should help you. Its also based on http://msdn.microsoft.com/en-us/library/ms788727.aspx you can change the TreeViewItem's Template to a StackPanel and set the ItemsPanel left Margin to 19. Then in the TreeView you set the HorizontalContentAlignment="Stretch". I'm attaching the entire resource below, but here is the important part.

    <ControlTemplate TargetType="{x:Type TreeViewItem}">
<StackPanel>
    <Border Name="Bd"
      Background="{TemplateBinding Background}"
      BorderBrush="{TemplateBinding BorderBrush}"
      BorderThickness="{TemplateBinding BorderThickness}"
      Padding="{TemplateBinding Padding}">
        <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="19" />
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
              <ToggleButton x:Name="Expander"
                      Style="{StaticResource ExpandCollapseToggleStyle}"
                      IsChecked="{Binding Path=IsExpanded,
                                  RelativeSource={RelativeSource TemplatedParent}}"
                      ClickMode="Press"/>
              <ContentPresenter x:Name="PART_Header"
                    Grid.Column="1"
                        ContentSource="Header"
                        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"/>
        </Grid>
  </Border>
  <ItemsPresenter x:Name="ItemsHost" Margin="19,0,0,0" />
</StackPanel>
<!-- Triggers -->
</ControlTemplate>

    Control

    <TreeView Margin="50" HorizontalContentAlignment="Stretch">
    <TreeViewItem Header="test2"/>
    <TreeViewItem Header="test2">
        <TreeViewItem Header="sub test"/>
        <TreeViewItem Header="sub test2"/>
    </TreeViewItem>
    <TreeViewItem Header="test3"/>
</TreeView>

    Resources

    <SolidColorBrush x:Key="GlyphBrush" Color="#444" />

<!--=================================================================
      TreeViewItem
  ==================================================================-->
<Style x:Key="ExpandCollapseToggleStyle" TargetType="ToggleButton">
  <Setter Property="Focusable" Value="False"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="ToggleButton">
        <Grid
          Width="15"
          Height="13"
          Background="Transparent">
          <Path x:Name="ExpandPath"
            HorizontalAlignment="Left" 
            VerticalAlignment="Center" 
            Margin="1,1,1,1"
            Fill="{StaticResource GlyphBrush}"
            Data="M 4 0 L 8 4 L 4 8 Z"/>
        </Grid>
        <ControlTemplate.Triggers>
          <Trigger Property="IsChecked"
               Value="True">
            <Setter Property="Data"
                TargetName="ExpandPath"
                Value="M 0 4 L 8 4 L 4 8 Z"/>
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>
<Style x:Key="TreeViewItemFocusVisual">
  <Setter Property="Control.Template">
    <Setter.Value>
      <ControlTemplate>
        <Border>
          <Rectangle Margin="0,0,0,0"
                 StrokeThickness="5"
                 Stroke="Black"
                 StrokeDashArray="1 2"
                 Opacity="0"/>
        </Border>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>


<Style x:Key="{x:Type TreeViewItem}"
     TargetType="{x:Type TreeViewItem}">
  <Setter Property="Background"
      Value="Transparent"/>
  <Setter Property="HorizontalContentAlignment"
      Value="{Binding Path=HorizontalContentAlignment,
              RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
  <Setter Property="VerticalContentAlignment"
      Value="{Binding Path=VerticalContentAlignment,
              RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
  <Setter Property="Padding"
      Value="1,0,0,0"/>
  <Setter Property="Foreground"
      Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
  <Setter Property="FocusVisualStyle"
      Value="{StaticResource TreeViewItemFocusVisual}"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type TreeViewItem}">
        <StackPanel>
            <Border Name="Bd"
              Background="{TemplateBinding Background}"
              BorderBrush="{TemplateBinding BorderBrush}"
              BorderThickness="{TemplateBinding BorderThickness}"
              Padding="{TemplateBinding Padding}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="19" />
                    <ColumnDefinition />
                </Grid.ColumnDefinitions>
                  <ToggleButton x:Name="Expander"
                          Style="{StaticResource ExpandCollapseToggleStyle}"
                          IsChecked="{Binding Path=IsExpanded,
                                      RelativeSource={RelativeSource TemplatedParent}}"
                          ClickMode="Press"/>
                <ContentPresenter x:Name="PART_Header"
                            Grid.Column="1"
                          ContentSource="Header"
                          HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"/>
            </Grid>
          </Border>
          <ItemsPresenter x:Name="ItemsHost" Margin="19,0,0,0" />
        </StackPanel>
        <ControlTemplate.Triggers>
          <Trigger Property="IsExpanded"
               Value="false">
            <Setter TargetName="ItemsHost"
                Property="Visibility"
                Value="Collapsed"/>
          </Trigger>
          <Trigger Property="HasItems"
               Value="false">
            <Setter TargetName="Expander"
                Property="Visibility"
                Value="Hidden"/>
          </Trigger>
          <MultiTrigger>
            <MultiTrigger.Conditions>
              <Condition Property="HasHeader"
                     Value="false"/>
              <Condition Property="Width"
                     Value="Auto"/>
            </MultiTrigger.Conditions>
            <Setter TargetName="PART_Header"
                Property="MinWidth"
                Value="75"/>
          </MultiTrigger>
          <MultiTrigger>
            <MultiTrigger.Conditions>
              <Condition Property="HasHeader"
                     Value="false"/>
              <Condition Property="Height"
                     Value="Auto"/>
            </MultiTrigger.Conditions>
            <Setter TargetName="PART_Header"
                Property="MinHeight"
                Value="19"/>
          </MultiTrigger>
          <Trigger Property="IsSelected"
               Value="true">
            <Setter TargetName="Bd"
                Property="Background"
                Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
            <Setter Property="Foreground"
                Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
          </Trigger>
          <MultiTrigger>
            <MultiTrigger.Conditions>
              <Condition Property="IsSelected"
                     Value="true"/>
              <Condition Property="IsSelectionActive"
                     Value="false"/>
            </MultiTrigger.Conditions>
            <Setter TargetName="Bd"
                Property="Background"
                Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
            <Setter Property="Foreground"
                Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
          </MultiTrigger>
          <Trigger Property="IsEnabled"
               Value="false">
            <Setter Property="Foreground"
                Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>
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  • 囚心锁ツ
    2020-11-30 18:50

    This is by far the easiest solution. Just create a rectangle, call it Hb, and set its margine to -100px and not visible. Only set it to Visible when you've it selected or mouse over. It's a hack, but you're good for up to 5 levels of nested TreeViewItems (100 > 19*5)

         <ControlTemplate TargetType="{x:Type TreeViewItem}">
  <Grid>
   <Grid.ColumnDefinitions>
    <ColumnDefinition MinWidth="19" Width="Auto"/>
    <ColumnDefinition Width="*"/>
   </Grid.ColumnDefinitions>
   <Grid.RowDefinitions>
    <RowDefinition Height="Auto"/>
    <RowDefinition/>
   </Grid.RowDefinitions>
                        <ToggleButton x:Name="Expander" Style="{StaticResource ExpandCollapseToggleStyle}" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press" VerticalAlignment="Top" Panel.ZIndex="1"/>
   <Rectangle x:Name="Hb" Width="Auto" Height="Auto" Grid.ColumnSpan="2" Margin="-100,0,0,0" Panel.ZIndex="-1" Visibility="Hidden" />
                        <Border x:Name="Bd" SnapsToDevicePixels="true" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" Grid.Column="1" Panel.ZIndex="0">
    <ContentPresenter x:Name="PART_Header" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" ContentSource="Header" HorizontalAlignment="Stretch"/>
   </Border>
   <ItemsPresenter x:Name="ItemsHost" Grid.Column="0" Grid.Row="1" Grid.ColumnSpan="2" Margin="19,0,0,0"/>
  </Grid>
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  • 失恋的感觉
    2020-11-30 18:50

    If you mean something like this screenshot


    (source: bendewey.com)

    Then this should help you. Its based on http://msdn.microsoft.com/en-us/library/ms788727.aspx you can make some changes to the TreeViewItem's Grid layout. Basically you remove the third column. Then in the TreeView you set the HorizontalContentAlignment="Stretch". I'm attaching the entire resource below, but here is the important part.

    <!-- ... -->
<ControlTemplate TargetType="{x:Type TreeViewItem}">
  <Grid>
    <Grid.ColumnDefinitions>
      <ColumnDefinition MinWidth="19"
                Width="Auto"/>
      <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto"/>
      <RowDefinition/>
    </Grid.RowDefinitions>
    <!-- ... -->

    Control

    <TreeView Margin="50" HorizontalContentAlignment="Stretch">
    <TreeViewItem Header="test2"/>
    <TreeViewItem Header="test2">
        <TreeViewItem Header="sub test"/>
        <TreeViewItem Header="sub test2"/>
    </TreeViewItem>
    <TreeViewItem Header="test3"/>
</TreeView>

    Resources

    <SolidColorBrush x:Key="GlyphBrush" Color="#444" />

<!--=================================================================
   TreeViewItem
==================================================================-->
<Style x:Key="ExpandCollapseToggleStyle" TargetType="ToggleButton">
  <Setter Property="Focusable" Value="False"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="ToggleButton">
        <Grid
          Width="15"
          Height="13"
          Background="Transparent">
          <Path x:Name="ExpandPath"
            HorizontalAlignment="Left" 
            VerticalAlignment="Center" 
            Margin="1,1,1,1"
            Fill="{StaticResource GlyphBrush}"
            Data="M 4 0 L 8 4 L 4 8 Z"/>
        </Grid>
        <ControlTemplate.Triggers>
          <Trigger Property="IsChecked"
               Value="True">
            <Setter Property="Data"
                TargetName="ExpandPath"
                Value="M 0 4 L 8 4 L 4 8 Z"/>
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>
<Style x:Key="TreeViewItemFocusVisual">
  <Setter Property="Control.Template">
    <Setter.Value>
      <ControlTemplate>
        <Border>
          <Rectangle Margin="0,0,0,0"
                 StrokeThickness="5"
                 Stroke="Black"
                 StrokeDashArray="1 2"
                 Opacity="0"/>
        </Border>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>


<Style x:Key="{x:Type TreeViewItem}"
     TargetType="{x:Type TreeViewItem}">
  <Setter Property="Background"
      Value="Transparent"/>
  <Setter Property="HorizontalContentAlignment"
      Value="{Binding Path=HorizontalContentAlignment,
              RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
  <Setter Property="VerticalContentAlignment"
      Value="{Binding Path=VerticalContentAlignment,
              RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
  <Setter Property="Padding"
      Value="1,0,0,0"/>
  <Setter Property="Foreground"
      Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
  <Setter Property="FocusVisualStyle"
      Value="{StaticResource TreeViewItemFocusVisual}"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type TreeViewItem}">
        <Grid>
          <Grid.ColumnDefinitions>
            <ColumnDefinition MinWidth="19"
                      Width="Auto"/>
            <ColumnDefinition Width="*"/>
          </Grid.ColumnDefinitions>
          <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition/>
          </Grid.RowDefinitions>
          <ToggleButton x:Name="Expander"
                  Style="{StaticResource ExpandCollapseToggleStyle}"
                  IsChecked="{Binding Path=IsExpanded,
                              RelativeSource={RelativeSource TemplatedParent}}"
                  ClickMode="Press"/>
          <Border Name="Bd"
              Grid.Column="1"
              Background="{TemplateBinding Background}"
              BorderBrush="{TemplateBinding BorderBrush}"
              BorderThickness="{TemplateBinding BorderThickness}"
              Padding="{TemplateBinding Padding}">
            <ContentPresenter x:Name="PART_Header"
                      ContentSource="Header"
                      HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"/>
          </Border>
          <ItemsPresenter x:Name="ItemsHost"
                  Grid.Row="1"
                  Grid.Column="1"/>
        </Grid>
        <ControlTemplate.Triggers>
          <Trigger Property="IsExpanded" Value="false">
            <Setter TargetName="ItemsHost" Property="Visibility" Value="Collapsed"/>
          </Trigger>
          <Trigger Property="HasItems" Value="false">
            <Setter TargetName="Expander" Property="Visibility" Value="Hidden"/>
          </Trigger>
          <MultiTrigger>
            <MultiTrigger.Conditions>
              <Condition Property="HasHeader" Value="false"/>
              <Condition Property="Width" Value="Auto"/>
            </MultiTrigger.Conditions>
            <Setter TargetName="PART_Header" Property="MinWidth" Value="75"/>
          </MultiTrigger>
          <MultiTrigger>
            <MultiTrigger.Conditions>
              <Condition Property="HasHeader" Value="false"/>
              <Condition Property="Height" Value="Auto"/>
            </MultiTrigger.Conditions>
            <Setter TargetName="PART_Header" Property="MinHeight" Value="19"/>
          </MultiTrigger>
          <Trigger Property="IsSelected" Value="true">
            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
          </Trigger>
          <MultiTrigger>
            <MultiTrigger.Conditions>
              <Condition Property="IsSelected" Value="true"/>
              <Condition Property="IsSelectionActive" Value="false"/>
            </MultiTrigger.Conditions>
            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
          </MultiTrigger>
          <Trigger Property="IsEnabled" Value="false">
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>
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