c# - TreeView.HideSelection = false - WPF 中的等效项

Question

我正在寻找与 TreeView.HideSelection = false 等效的 WPF TreeView。有人有想法吗？

Answer 1

如果我对 TreeView.HideSelection 的理解是正确的，请将以下内容放入您的资源中:

<ControlTemplate x:Key="StaysHighlightedTreeViewItemTemplate" 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}}">
            <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="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" CenterY="3" CenterX="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>
            </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 x:Name="PART_Header" ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" ContentStringFormat="{TemplateBinding HeaderStringFormat}" 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="IsSelected" Value="True">
            <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
        </Trigger>
        <Trigger Property="IsEnabled" Value="False">
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
        </Trigger>
    </ControlTemplate.Triggers>
</ControlTemplate>

<Style x:Key="StaysHighlightedTreeViewItem" TargetType="{x:Type TreeViewItem}">
    <Setter Property="Template" Value="{StaticResource StaysHighlightedTreeViewItemTemplate}"/>
</Style>

然后使用这样的样式:

<TreeView ItemContainerStyle="{StaticResource StaysHighlightedTreeViewItem}" />

默认的控件模板具有以下触发器:

<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>

当选择未处于事件状态(即没有键盘焦点)时，这会更改所选项目的突出显示，通过删除此触发器，即使没有焦点，也会使用标准突出显示。