TreeView 樣式和範本
本主題說明 TreeView 控件項的樣式和範本。 您可以修改預設的 ControlTemplate，為控制項提供唯一的外觀。 如需詳細資訊，請參閱為控制項建立範本。
TreeView 組件
TreeView 控制項沒有任何具名組件。
當您為 ControlTemplate 建立 TreeView 時，您的範本可能會在 ItemsPresenter 內包含 ScrollViewer。 (ItemsPresenter 會顯示 TreeView 中的每個項目；ScrollViewer 會在控件項內啟用卷動)。 如果 ItemsPresenter 不是 ScrollViewer 的直接子項目，您必須為 ItemsPresenter 命名，ItemsPresenter。
TreeView 狀態
下表列出 TreeView 控制項的視覺物件狀態。
| VisualState 名稱 | VisualStateGroup 名稱 | 描述 |
|---|---|---|
| 有效 | ValidationStates | 控制項會使用 Validation 類別，且 Validation.HasError 的附加屬性為 false。 |
| InvalidFocused | ValidationStates |
Validation.HasError 附加屬性為具有焦點控制項的 true。 |
| InvalidUnfocused | ValidationStates |
Validation.HasError 附加屬性為不具有焦點控制項的 true。 |
TreeViewItem 組件
下表列出 TreeViewItem 控件項的具名組件。
| 部分 | 類型 | 描述 |
|---|---|---|
| PART_Header | FrameworkElement | 包含 TreeView 控制項之標題內容的可視化元素。 |
TreeViewItem 狀態
下表會列出 TreeViewItem 控制項的視覺效果狀態。
| VisualState 名稱 | VisualStateGroup 名稱 | 描述 |
|---|---|---|
| Normal | CommonStates | 預設狀態。 |
| MouseOver | CommonStates | 將滑鼠指標放置在 TreeViewItem 上方。 |
| 已停用 | CommonStates | TreeViewItem 已停用。 |
| 焦點 | FocusStates | TreeViewItem 具有焦點。 |
| 未取得焦點 | FocusStates | TreeViewItem 未取得焦點。 |
| 展開 | ExpansionStates | TreeViewItem 控制項已展開。 |
| Collapsed | ExpansionStates | TreeViewItem 控制項已折疊。 |
| HasItems | HasItemsStates | TreeViewItem 有項目。 |
| NoItems | HasItemsStates | TreeViewItem 沒有項目。 |
| Selected | SelectionStates | 已選取 TreeViewItem。 |
| SelectedInactive | SelectionStates | 已選取 TreeViewItem，但並未使用中。 |
| 未選取 | SelectionStates | 未選取 TreeViewItem。 |
| 有效 | ValidationStates | 控制項會使用 Validation 類別，且 Validation.HasError 的附加屬性為 false。 |
| InvalidFocused | ValidationStates |
Validation.HasError 附加屬性為具有焦點控制項的 true。 |
| InvalidUnfocused | ValidationStates |
Validation.HasError 附加屬性為不具有焦點控制項的 true。 |
TreeView ControlTemplate 範例
下列範例顯示如何定義 ControlTemplate 控制項的 TreeView 和其相關聯類型。
<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>
上述範例使用下列一或多項資源。
<!--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>
如需完整的範例，請參閱使用 ControlTemplate 設定樣式範例。
