Jak zmienić kolor/krycie trójkątnej ikony na TreeViewItem?

Question

Niektóre z moich TreeViewItems to klikalne, a niektóre z nich nie.

Dla osób, które nie są klikalne, zmieniłem kolor na Pierwszy plan na szary.

Jednakże, jeśli ten element ma dzieci, chcę też zmienić trochę trójkątny kulę na szary.

Jak mogę zrobić coś takiego:

//PSEUDO-CODE: 
<TreeViewItem IconBulletEnabled="False" IconBulletColor="#aaa" Header="Part 1"/> 

alt text http://i36.tinypic.com/33mpo5x.png

Answer 1

Będziesz musiał edytować ControlTemplate. Wyodrębniłem domyślny dla ciebie z Expression Blend. Trzeba syf się z nim aż do uzyskania żądanego efektu, a następnie zastosować je do swoich TreeViewItems tak:

<TreeViewItem Header="Word 1" ItemContainerStyle="{DynamicResource TreeViewItemStyle1}"/> 

Oto styl sam w sobie:

 <Style x:Key="TreeViewItemFocusVisual"> 
      <Setter Property="Control.Template"> 
       <Setter.Value> 
        <ControlTemplate> 
         <Rectangle/> 
        </ControlTemplate> 
       </Setter.Value> 
      </Setter> 
     </Style> 
     <PathGeometry x:Key="TreeArrow" Figures="M0,0 L0,6 L6,0 z"/> 
     <Style x:Key="ExpandCollapseToggleStyle" TargetType="{x:Type ToggleButton}"> 
      <Setter Property="Focusable" Value="False"/> 
      <Setter Property="Width" Value="16"/> 
      <Setter Property="Height" Value="16"/> 
      <Setter Property="Template"> 
       <Setter.Value> 
        <ControlTemplate TargetType="{x:Type ToggleButton}"> 
         <Border Width="16" Height="16" Background="Transparent" Padding="5,5,5,5"> 
          <Path x:Name="ExpandPath" Fill="Transparent" Stroke="#FF989898" Data="{StaticResource TreeArrow}"> 
           <Path.RenderTransform> 
            <RotateTransform Angle="135" CenterX="3" CenterY="3"/> 
           </Path.RenderTransform> 
          </Path> 
         </Border> 
         <ControlTemplate.Triggers> 
          <Trigger Property="IsMouseOver" Value="True"> 
           <Setter Property="Stroke" TargetName="ExpandPath" Value="#FF1BBBFA"/> 
           <Setter Property="Fill" TargetName="ExpandPath" Value="Transparent"/> 
          </Trigger> 
          <Trigger Property="IsChecked" Value="True"> 
           <Setter Property="RenderTransform" TargetName="ExpandPath"> 
            <Setter.Value> 
             <RotateTransform Angle="180" CenterX="3" CenterY="3"/> 
            </Setter.Value> 
           </Setter> 
           <Setter Property="Fill" TargetName="ExpandPath" Value="#FF595959"/> 
           <Setter Property="Stroke" TargetName="ExpandPath" Value="#FF262626"/> 
          </Trigger> 
         </ControlTemplate.Triggers> 
        </ControlTemplate> 
       </Setter.Value> 
      </Setter> 
     </Style> 
     <Style x:Key="TreeViewItemStyle1" TargetType="{x:Type TreeViewItem}"> 
      <Setter Property="Background" Value="Transparent"/> 
      <Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/> 
      <Setter Property="VerticalContentAlignment" Value="{Binding 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="Auto"/> 
           <ColumnDefinition Width="*"/> 
          </Grid.ColumnDefinitions> 
          <Grid.RowDefinitions> 
           <RowDefinition Height="Auto"/> 
           <RowDefinition/> 
          </Grid.RowDefinitions> 
          <ToggleButton x:Name="Expander" Style="{StaticResource ExpandCollapseToggleStyle}" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}"/> 
          <Border x:Name="Bd" SnapsToDevicePixels="true" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" Grid.Column="1"> 
           <ContentPresenter x:Name="PART_Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" ContentSource="Header"/> 
          </Border> 
          <ItemsPresenter x:Name="ItemsHost" Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="1"/> 
         </Grid> 
         <ControlTemplate.Triggers> 
          <Trigger Property="IsExpanded" Value="false"> 
           <Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/> 
          </Trigger> 
          <Trigger Property="HasItems" Value="false"> 
           <Setter Property="Visibility" TargetName="Expander" Value="Hidden"/> 
          </Trigger> 
          <Trigger Property="IsSelected" Value="true"> 
           <Setter Property="Background" TargetName="Bd" 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 Property="Background" TargetName="Bd" 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.Triggers> 
       <Trigger Property="VirtualizingStackPanel.IsVirtualizing" Value="true"> 
        <Setter Property="ItemsPanel"> 
         <Setter.Value> 
          <ItemsPanelTemplate> 
           <VirtualizingStackPanel/> 
          </ItemsPanelTemplate> 
         </Setter.Value> 
        </Setter> 
       </Trigger> 
      </Style.Triggers> 
     </Style>