Стили и шаблоны элемента TreeViewTreeView Styles and Templates

В этом разделе описываются стили и шаблоны для элемента управления TreeView.This topic describes the styles and templates for the TreeView control. Можно изменить ControlTemplate по умолчанию, чтобы обеспечить уникальность внешнего вида элемента управления.You can modify the default ControlTemplate to give the control a unique appearance. Дополнительные сведения см. в разделе Создание шаблона для элемента управления.For more information, see Create a template for a control.

Части TreeViewTreeView Parts

Элемент управления TreeView не имеет именованных частей.The TreeView control does not have any named parts.

При создании ControlTemplate для TreeViewшаблон может содержать ItemsPresenter в пределах ScrollViewer.When you create a ControlTemplate for an TreeView, your template might contain a ItemsPresenter within a ScrollViewer. (ItemsPresenter отображает каждый элемент в TreeView; ScrollViewer включает прокрутку в элементе управления).(The ItemsPresenter displays each item in the TreeView; the ScrollViewer enables scrolling within the control). Если ItemsPresenter не является прямым дочерним элементом ScrollViewer, необходимо присвоить ItemsPresenter имя, ItemsPresenter.If the ItemsPresenter is not the direct child of the ScrollViewer, you must give the ItemsPresenter the name, ItemsPresenter.

Состояния TreeViewTreeView States

В следующей таблице перечислены визуальные состояния для элемента управления TreeView.The following table lists the visual states for the TreeView control.

Имя VisualStateVisualState Name Имя VisualStateGroupVisualStateGroup Name ОписаниеDescription
ValidValid ValidationStatesValidationStates Элемент управления использует класс Validation, а HasError присоединенным свойством является false.The control uses the Validation class and the HasError attached property is false.
InvalidFocusedInvalidFocused ValidationStatesValidationStates Присоединенное HasError свойство имеет true элемент управления имеет фокус.The HasError attached property is true has the control has focus.
InvalidUnfocusedInvalidUnfocused ValidationStatesValidationStates Присоединенное HasError свойство имеет true элемент управления не имеет фокуса.The HasError attached property is true has the control does not have focus.

TreeViewItem частиTreeViewItem Parts

В следующей таблице перечислены именованные части для элемента управления TreeViewItem.The following table lists the named parts for the TreeViewItem control.

ОтделениеPart ВведитеType ОписаниеDescription
PART_HeaderPART_Header FrameworkElement Визуальный элемент, содержащий содержимое заголовка элемента управления TreeView.A visual element that contains that header content of the TreeView control.

Состояния TreeViewItemTreeViewItem States

В следующей таблице перечислены визуальные состояния для элемента управления TreeViewItem.The following table lists the visual states for TreeViewItem control.

Имя VisualStateVisualState Name Имя VisualStateGroupVisualStateGroup Name ОписаниеDescription
НормальныйNormal CommonStatesCommonStates Состояние по умолчанию.The default state.
MouseOverMouseOver CommonStatesCommonStates Указатель мыши располагается на TreeViewItem.The mouse pointer is positioned over the TreeViewItem.
Отключено.Disabled CommonStatesCommonStates TreeViewItem отключена.The TreeViewItem is disabled.
FocusedFocused FocusStatesFocusStates TreeViewItem имеет фокус.The TreeViewItem has focus.
Без фокуса вводаUnfocused FocusStatesFocusStates TreeViewItem не имеет фокуса.The TreeViewItem does not have focus.
РазреженныйExpanded експансионстатесExpansionStates Элемент управления TreeViewItem развернут.The TreeViewItem control is expanded.
СвернутоCollapsed експансионстатесExpansionStates Элемент управления TreeViewItem свернут.The TreeViewItem control is collapsed.
HasItemsHasItems хаситемсстатесHasItemsStates TreeViewItem содержит элементы.The TreeViewItem has items.
ЭлементовNoItems хаситемсстатесHasItemsStates TreeViewItem не содержит элементов.The TreeViewItem does not have items.
ВыбранныеSelected SelectionStatesSelectionStates Выбрано TreeViewItem.The TreeViewItem is selected.
селектединактивеSelectedInactive SelectionStatesSelectionStates TreeViewItem выбран, но неактивен.The TreeViewItem is selected but not active.
UnselectedUnselected SelectionStatesSelectionStates TreeViewItem не выбран.The TreeViewItem is not selected.
ValidValid ValidationStatesValidationStates Элемент управления использует класс Validation, а HasError присоединенным свойством является false.The control uses the Validation class and the HasError attached property is false.
InvalidFocusedInvalidFocused ValidationStatesValidationStates Присоединенное HasError свойство имеет true элемент управления имеет фокус.The HasError attached property is true has the control has focus.
InvalidUnfocusedInvalidUnfocused ValidationStatesValidationStates Присоединенное HasError свойство имеет true элемент управления не имеет фокуса.The HasError attached property is true has the control does not have focus.

Пример ControlTemplate в TreeViewTreeView ControlTemplate Example

В следующем примере показано, как определить ControlTemplate для элемента управления TreeView и связанных с ним типов.The following example shows how to define a ControlTemplate for the TreeView control and its associated types.

<Style x:Key="{x:Type TreeView}"
       TargetType="TreeView">
  <Setter Property="OverridesDefaultStyle"
          Value="True" />
  <Setter Property="SnapsToDevicePixels"
          Value="True" />
  <Setter Property="ScrollViewer.HorizontalScrollBarVisibility"
          Value="Auto" />
  <Setter Property="ScrollViewer.VerticalScrollBarVisibility"
          Value="Auto" />
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="TreeView">
        <Border Name="Border"
                CornerRadius="1"
                BorderThickness="1">
          <Border.BorderBrush>
            <SolidColorBrush Color="{DynamicResource BorderMediumColor}" />
          </Border.BorderBrush>
          <Border.Background>
            <SolidColorBrush Color="{DynamicResource ControlLightColor}" />
          </Border.Background>
          <ScrollViewer Focusable="False"
                        CanContentScroll="False"
                        Padding="4">
            <ItemsPresenter />
          </ScrollViewer>
        </Border>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

<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">
          <VisualStateManager.VisualStateGroups>
            <VisualStateGroup x:Name="CheckStates">
              <VisualState x:Name="Checked">
                <Storyboard>
                  <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"
                                                 Storyboard.TargetName="Collapsed">
                    <DiscreteObjectKeyFrame KeyTime="0"
                                            Value="{x:Static Visibility.Hidden}" />
                  </ObjectAnimationUsingKeyFrames>
                  <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"
                                                 Storyboard.TargetName="Expanded">
                    <DiscreteObjectKeyFrame KeyTime="0"
                                            Value="{x:Static Visibility.Visible}" />
                  </ObjectAnimationUsingKeyFrames>
                </Storyboard>
              </VisualState>
              <VisualState x:Name="Unchecked" />
              <VisualState x:Name="Indeterminate" />
            </VisualStateGroup>
          </VisualStateManager.VisualStateGroups>
          <Path x:Name="Collapsed"
                HorizontalAlignment="Left"
                VerticalAlignment="Center"
                Margin="1,1,1,1"
                Data="M 4 0 L 8 4 L 4 8 Z">
            <Path.Fill>
              <SolidColorBrush Color="{DynamicResource GlyphColor}" />
            </Path.Fill>
          </Path>
          <Path x:Name="Expanded"
                HorizontalAlignment="Left"
                VerticalAlignment="Center"
                Margin="1,1,1,1"
                Data="M 0 4 L 8 4 L 4 8 Z"
                Visibility="Hidden">
            <Path.Fill>
              <SolidColorBrush Color="{DynamicResource GlyphColor}" />
            </Path.Fill>
          </Path>
        </Grid>
      </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="Auto" />
            <ColumnDefinition Width="*" />
          </Grid.ColumnDefinitions>
          <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition />
          </Grid.RowDefinitions>
          <VisualStateManager.VisualStateGroups>
            <VisualStateGroup x:Name="SelectionStates">
              <VisualState x:Name="Selected">
                <Storyboard>
                  <ColorAnimationUsingKeyFrames Storyboard.TargetName="Bd"
                                                Storyboard.TargetProperty="(Panel.Background).
                    (SolidColorBrush.Color)"
                                                >
                    <EasingColorKeyFrame KeyTime="0"
                                         Value="{StaticResource SelectedBackgroundColor}" />
                  </ColorAnimationUsingKeyFrames>
                </Storyboard>
              </VisualState>
              <VisualState x:Name="Unselected" />
              <VisualState x:Name="SelectedInactive">
                <Storyboard>
                  <ColorAnimationUsingKeyFrames Storyboard.TargetName="Bd"
                                                Storyboard.TargetProperty="(Panel.Background).
                    (SolidColorBrush.Color)">
                    <EasingColorKeyFrame KeyTime="0"
                                         Value="{StaticResource SelectedUnfocusedColor}" />
                  </ColorAnimationUsingKeyFrames>
                </Storyboard>
              </VisualState>
            </VisualStateGroup>
            <VisualStateGroup x:Name="ExpansionStates">
              <VisualState x:Name="Expanded">
                <Storyboard>
                  <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"
                                                 Storyboard.TargetName="ItemsHost">
                    <DiscreteObjectKeyFrame KeyTime="0"
                                            Value="{x:Static Visibility.Visible}" />
                  </ObjectAnimationUsingKeyFrames>
                </Storyboard>
              </VisualState>
              <VisualState x:Name="Collapsed" />
            </VisualStateGroup>
          </VisualStateManager.VisualStateGroups>
          <ToggleButton x:Name="Expander"
                        Style="{StaticResource ExpandCollapseToggleStyle}"
                        ClickMode="Press"
                        IsChecked="{Binding IsExpanded, 
            RelativeSource={RelativeSource TemplatedParent}}"/>
          <Border x: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.ColumnSpan="2"
                          Visibility="Collapsed" />
        </Grid>
        <ControlTemplate.Triggers>
          <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>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

В предыдущем примере используется один или несколько из следующих ресурсов.The preceding example uses one or more of the following resources.

<!--Control colors.-->
<Color x:Key="WindowColor">#FFE8EDF9</Color>
<Color x:Key="ContentAreaColorLight">#FFC5CBF9</Color>
<Color x:Key="ContentAreaColorDark">#FF7381F9</Color>

<Color x:Key="DisabledControlLightColor">#FFE8EDF9</Color>
<Color x:Key="DisabledControlDarkColor">#FFC5CBF9</Color>
<Color x:Key="DisabledForegroundColor">#FF888888</Color>

<Color x:Key="SelectedBackgroundColor">#FFC5CBF9</Color>
<Color x:Key="SelectedUnfocusedColor">#FFDDDDDD</Color>

<Color x:Key="ControlLightColor">White</Color>
<Color x:Key="ControlMediumColor">#FF7381F9</Color>
<Color x:Key="ControlDarkColor">#FF211AA9</Color>

<Color x:Key="ControlMouseOverColor">#FF3843C4</Color>
<Color x:Key="ControlPressedColor">#FF211AA9</Color>


<Color x:Key="GlyphColor">#FF444444</Color>
<Color x:Key="GlyphMouseOver">sc#1, 0.004391443, 0.002428215, 0.242281124</Color>

<!--Border colors-->
<Color x:Key="BorderLightColor">#FFCCCCCC</Color>
<Color x:Key="BorderMediumColor">#FF888888</Color>
<Color x:Key="BorderDarkColor">#FF444444</Color>

<Color x:Key="PressedBorderLightColor">#FF888888</Color>
<Color x:Key="PressedBorderDarkColor">#FF444444</Color>

<Color x:Key="DisabledBorderLightColor">#FFAAAAAA</Color>
<Color x:Key="DisabledBorderDarkColor">#FF888888</Color>

<Color x:Key="DefaultBorderBrushDarkColor">Black</Color>

<!--Control-specific resources.-->
<Color x:Key="HeaderTopColor">#FFC5CBF9</Color>
<Color x:Key="DatagridCurrentCellBorderColor">Black</Color>
<Color x:Key="SliderTrackDarkColor">#FFC5CBF9</Color>

<Color x:Key="NavButtonFrameColor">#FF3843C4</Color>

<LinearGradientBrush x:Key="MenuPopupBrush"
                     EndPoint="0.5,1"
                     StartPoint="0.5,0">
  <GradientStop Color="{DynamicResource ControlLightColor}"
                Offset="0" />
  <GradientStop Color="{DynamicResource ControlMediumColor}"
                Offset="0.5" />
  <GradientStop Color="{DynamicResource ControlLightColor}"
                Offset="1" />
</LinearGradientBrush>

<LinearGradientBrush x:Key="ProgressBarIndicatorAnimatedFill"
                     StartPoint="0,0"
                     EndPoint="1,0">
  <LinearGradientBrush.GradientStops>
    <GradientStopCollection>
      <GradientStop Color="#000000FF"
                    Offset="0" />
      <GradientStop Color="#600000FF"
                    Offset="0.4" />
      <GradientStop Color="#600000FF"
                    Offset="0.6" />
      <GradientStop Color="#000000FF"
                    Offset="1" />
    </GradientStopCollection>
  </LinearGradientBrush.GradientStops>
</LinearGradientBrush>

Полный пример см. в разделе Пример задания стиля с помощью ControlTemplates.For the complete sample, see Styling with ControlTemplates Sample.

См. такжеSee also