在 TreeView 中禁用选择

Question

我看到有一些方法可以禁用 ListView 中的选择，但我还没有看到 TreeView 或 Grid 中的任何内容。

我的表格很基础，看起来像这样：

问题是有人可以点击任何一个标签，突然间它看起来像这样：

如何禁用此行为？

<TreeView Focusable="False">
    <TreeView.ItemContainerStyle>
        <Style TargetType="{x:Type TreeViewItem}">
            <Setter Property="Focusable" Value="False"/>
        </Style>
    </TreeView.ItemContainerStyle>
    <TreeViewItem Focusable="False">
        <TreeViewItem.Header>Group Header</TreeViewItem.Header>
        <TreeViewItem.IsExpanded>true</TreeViewItem.IsExpanded>
        <Grid Focusable="False">
            <Grid.RowDefinitions>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"></ColumnDefinition>
                <ColumnDefinition Width="Auto"></ColumnDefinition>
            </Grid.ColumnDefinitions>
            <Label Content="Message ID">
                <Grid.Row>0</Grid.Row>
                <Grid.Column>0</Grid.Column>
            </Label>
            <TextBox Text="{Binding Path=GroupHeader.MessageId}" HorizontalAlignment="Stretch">
                <Grid.Column>1</Grid.Column>
                <Grid.Row>0</Grid.Row>
            </TextBox>
            <Label Content="Creation Date">
                <Grid.Row>1</Grid.Row>
                <Grid.Column>0</Grid.Column>
            </Label>
            <DatePicker SelectedDate="{Binding Path=GroupHeader.CreationDateTime}">
                <Grid.Row>1</Grid.Row>
                <Grid.Column>1</Grid.Column>
            </DatePicker>
            <Label Content="Instructing Agent">
                <Grid.Row>2</Grid.Row>
                <Grid.Column>0</Grid.Column>
            </Label>
            <TextBox Text="{Binding Path=GroupHeader.InstructingAgent}">
                <Grid.Row>2</Grid.Row>
                <Grid.Column>1</Grid.Column>
            </TextBox>
            <Label Content="Instructed Agent">
                <Grid.Row>3</Grid.Row>
                <Grid.Column>0</Grid.Column>
            </Label>
            <TextBox Text="{Binding Path=GroupHeader.InstructedAgent}">
                <Grid.Row>3</Grid.Row>
                <Grid.Column>1</Grid.Column>
            </TextBox>
        </Grid>
    </TreeViewItem>
   <TreeViewItem>
        ...
   </TreeViewItem>
</TreeView>

使用 TreeView.ItemContainerStyle 只会在实际项目 header 上禁用它，而不是其中的内容。

更新：我已经按照 Chris W 的评论和建议的有关设置控件模板的答案进行了尝试，使用以下内容：

<Style x:Key="StretchingTreeViewItemStyle1" TargetType="{x:Type local:StretchingTreeViewItem}">
  <Setter Property="Background" Value="Transparent"/>
  <Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type ItemsControl}}}"/>
  <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type ItemsControl}}}"/>
  <Setter Property="Padding" Value="1,0,0,0"/>
  <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
  <Setter Property="FocusVisualStyle">
    <Setter.Value>
      <Style>
        <Setter Property="Control.Template">
          <Setter.Value>
            <ControlTemplate>
              <Rectangle/>
            </ControlTemplate>
          </Setter.Value>
        </Setter>
      </Style>
    </Setter.Value>
  </Setter>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type local:StretchingTreeViewItem}">
        <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" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}">
            <ToggleButton.Style>
              <Style 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 Background="Transparent" Height="16" Padding="5" Width="16">
                        <Path x:Name="ExpandPath" Data="M0,0 L0,6 L6,0 z" Fill="Transparent" Stroke="#FF989898">
                          <Path.RenderTransform>
                            <RotateTransform Angle="135" CenterY="3" CenterX="3"/>
                          </Path.RenderTransform>
                        </Path>
                      </Border>
                      <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="True">
                          <Setter Property="RenderTransform" TargetName="ExpandPath">
                            <Setter.Value>
                              <RotateTransform Angle="180" CenterY="3" CenterX="3"/>
                            </Setter.Value>
                          </Setter>
                          <Setter Property="Fill" TargetName="ExpandPath" Value="#FF595959"/>
                          <Setter Property="Stroke" TargetName="ExpandPath" Value="#FF262626"/>
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="True">
                          <Setter Property="Stroke" TargetName="ExpandPath" Value="#FF1BBBFA"/>
                          <Setter Property="Fill" TargetName="ExpandPath" Value="Transparent"/>
                        </Trigger>
                        <MultiTrigger>
                          <MultiTrigger.Conditions>
                            <Condition Property="IsMouseOver" Value="True"/>
                            <Condition Property="IsChecked" Value="True"/>
                          </MultiTrigger.Conditions>
                          <Setter Property="Stroke" TargetName="ExpandPath" Value="#FF262626"/>
                          <Setter Property="Fill" TargetName="ExpandPath" Value="#FF595959"/>
                        </MultiTrigger>
                      </ControlTemplate.Triggers>
                    </ControlTemplate>
                  </Setter.Value>
                </Setter>
              </Style>
            </ToggleButton.Style>
          </ToggleButton>
          <Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.Column="1" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="True">
            <ContentPresenter Focusable="False" x:Name="PART_Header" ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" ContentStringFormat="{TemplateBinding HeaderStringFormat}" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
          </Border>
          <ItemsPresenter Focusable="False" x:Name="ItemsHost" Grid.ColumnSpan="2" Grid.Column="1" 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.InactiveSelectionHighlightBrushKey}}"/>
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}}"/>
          </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="VirtualizingPanel.IsVirtualizing" Value="True">
      <Setter Property="ItemsPanel">
        <Setter.Value>
          <ItemsPanelTemplate>
            <VirtualizingStackPanel IsItemsHost="True"/>
          </ItemsPanelTemplate>
        </Setter.Value>
      </Setter>
    </Trigger>
  </Style.Triggers>
</Style>

结果是 TreeViewItem 上的文本本身不再 selectable/doesn 未突出显示，但其中的内容仍然可以。

我已经尝试将所有我能想到的设置为 Focusable="False"，但这也不起作用，所以我开始认为这与专注于某个项目无关。特别是因为如果你嵌套了 TreeViews 你可以同时选择内部和外部项目。

Answer 1

如评论所述，TreeViewItem 的默认 ControlTemplate 中有两个触发器，可在选中项目时更改项目的外观。

通过删除这些触发器，您可以实现您想要的效果：

<Window x:Class="TreeViewProblem2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:TreeViewProblem2"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <Style x:Key="TreeViewItemFocusVisual">
            <Setter Property="Control.Template">
                <Setter.Value>
                    <ControlTemplate>
                        <Rectangle/>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Checked.Fill" Color="#FF595959"/>
        <SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Checked.Stroke" Color="#FF262626"/>
        <SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Stroke" Color="#FF27C7F7"/>
        <SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Fill" Color="#FFCCEEFB"/>
        <SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Checked.Stroke" Color="#FF1CC4F7"/>
        <SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Checked.Fill" Color="#FF82DFFB"/>
        <PathGeometry x:Key="TreeArrow" Figures="M0,0 L0,6 L6,0 z"/>
        <SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Fill" Color="#FFFFFFFF"/>
        <SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Stroke" Color="#FF818181"/>
        <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 Background="Transparent" Height="16" Padding="5,5,5,5" Width="16">
                            <Path x:Name="ExpandPath" Data="{StaticResource TreeArrow}" Fill="{StaticResource TreeViewItem.TreeArrow.Static.Fill}" Stroke="{StaticResource TreeViewItem.TreeArrow.Static.Stroke}">
                                <Path.RenderTransform>
                                    <RotateTransform Angle="135" CenterY="3" CenterX="3"/>
                                </Path.RenderTransform>
                            </Path>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsChecked" Value="True">
                                <Setter Property="RenderTransform" TargetName="ExpandPath">
                                    <Setter.Value>
                                        <RotateTransform Angle="180" CenterY="3" CenterX="3"/>
                                    </Setter.Value>
                                </Setter>
                                <Setter Property="Fill" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.Static.Checked.Fill}"/>
                                <Setter Property="Stroke" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.Static.Checked.Stroke}"/>
                            </Trigger>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Stroke" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Stroke}"/>
                                <Setter Property="Fill" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Fill}"/>
                            </Trigger>
                            <MultiTrigger>
                                <MultiTrigger.Conditions>
                                    <Condition Property="IsMouseOver" Value="True"/>
                                    <Condition Property="IsChecked" Value="True"/>
                                </MultiTrigger.Conditions>
                                <Setter Property="Stroke" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Checked.Stroke}"/>
                                <Setter Property="Fill" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Checked.Fill}"/>
                            </MultiTrigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style 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" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
                            <Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.Column="1" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
                                <ContentPresenter x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                            </Border>
                            <ItemsPresenter x:Name="ItemsHost" Grid.ColumnSpan="2" Grid.Column="1" 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="IsEnabled" Value="false">
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <Trigger Property="VirtualizingPanel.IsVirtualizing" Value="true">
                    <Setter Property="ItemsPanel">
                        <Setter.Value>
                            <ItemsPanelTemplate>
                                <VirtualizingStackPanel/>
                            </ItemsPanelTemplate>
                        </Setter.Value>
                    </Setter>
                </Trigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>

    <Grid>
        <TreeView Focusable="False">
            <TreeView.ItemContainerStyle>
                <Style TargetType="{x:Type TreeViewItem}">
                    <Setter Property="Focusable" Value="False"/>
                </Style>
            </TreeView.ItemContainerStyle>
            <TreeViewItem Focusable="False">
                <TreeViewItem.Header>Group Header</TreeViewItem.Header>
                <TreeViewItem.IsExpanded>true</TreeViewItem.IsExpanded>
                <Grid Focusable="False">
                    <Grid.RowDefinitions>
                        <RowDefinition></RowDefinition>
                        <RowDefinition></RowDefinition>
                        <RowDefinition></RowDefinition>
                        <RowDefinition></RowDefinition>
                        <RowDefinition></RowDefinition>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto"></ColumnDefinition>
                        <ColumnDefinition Width="Auto"></ColumnDefinition>
                    </Grid.ColumnDefinitions>
                    <Label Content="Message ID">
                        <Grid.Row>0</Grid.Row>
                        <Grid.Column>0</Grid.Column>
                    </Label>
                    <TextBox Text="{Binding Path=GroupHeader.MessageId}" HorizontalAlignment="Stretch">
                        <Grid.Column>1</Grid.Column>
                        <Grid.Row>0</Grid.Row>
                    </TextBox>
                    <Label Content="Creation Date">
                        <Grid.Row>1</Grid.Row>
                        <Grid.Column>0</Grid.Column>
                    </Label>
                    <DatePicker SelectedDate="{Binding Path=GroupHeader.CreationDateTime}">
                        <Grid.Row>1</Grid.Row>
                        <Grid.Column>1</Grid.Column>
                    </DatePicker>
                    <Label Content="Instructing Agent">
                        <Grid.Row>2</Grid.Row>
                        <Grid.Column>0</Grid.Column>
                    </Label>
                    <TextBox Text="{Binding Path=GroupHeader.InstructingAgent}">
                        <Grid.Row>2</Grid.Row>
                        <Grid.Column>1</Grid.Column>
                    </TextBox>
                    <Label Content="Instructed Agent">
                        <Grid.Row>3</Grid.Row>
                        <Grid.Column>0</Grid.Column>
                    </Label>
                    <TextBox Text="{Binding Path=GroupHeader.InstructedAgent}">
                        <Grid.Row>3</Grid.Row>
                        <Grid.Column>1</Grid.Column>
                    </TextBox>
                </Grid>
            </TreeViewItem>
        </TreeView>
    </Grid>
</Window>

这将适用于所有 TreeViewItem。我会把它们放在 ResourceDictionary 中，然后从那里拉出来。

获得用于编辑的默认 ControlTemplate 的一种方法是使用 Blend。这是选项：

Answer 2

我能够移除蓝色突出显示，同时仍然能够使用此 TreeView 样式与底层控件进行交互：

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:local="clr-namespace:WpfApplication1.resoureces">
    <SolidColorBrush x:Key="GlyphBrush" Color="#444" />
    <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="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.ColumnSpan="2"/>
                    </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>
</ResourceDictionary>

如你所见，我修改的地方在下面注释掉了。

                <!--<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>-->

Answer 3

我相信您自己已经注意到，禁用特定 TreeViewItem 选择的方法是将其 Focusable 属性设置为 false。您已经利用 TreeView.ItemContainerStyle 取得了部分成功 - 这导致无法选择 first-level 项目，但不会选择嵌套项目。这是由 TreeView 的设计方式造成的。

TreeView 基本上是一个 ItemsControl，它用 TreeViewItem 容器包装它的项目。这里的关键是它只包含它的 children （first-level 项），所以 TreeView.ItemContainerStyle 只应用于它的 children - 因此你的结果。

TreeViewItem 也派生自 ItemsControl，它包含它自己的 children，所以所有 second-level 项目都是它们的 children（和项目） first-level parents 等 TreeViewItem 也用 TreeViewItem 容器包裹它的所有 children - 在你的例子中， Grid 在 [=名为 "Group Header" 的 11=] 被 TreeViewItem 包裹，您可以使用 Snoop 等工具确认这一点。因此，为了禁用对 second-level 项目的选择，您应该像对 TreeView 所做的那样设置所有相应 first-level parent 项目的 TreeViewItem.ItemContainerStyle。

当然，在处理 multi-level 树时，为所有项目显式设置 TreeViewItem.ItemConainerStyle 可能会出现问题，因此您可以使用隐式样式：

<TreeView>
    <TreeView.Resources>
        <Style TargetType="TreeViewItem">
            <Setter Property="Focusable" Value="False" />
        </Style>
    </TreeView.Resources>
    ...
</TreeView>

现在，此样式将应用于 TreeView 中的所有 TreeViewItem 控件（w.r.t。隐式样式规则）——重要的是，不仅是 first-level 控件。这应该会为您带来预期的结果。

在 TreeView 中禁用选择

Disable selection in TreeView

c#

wpf

treeview

xaml