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

Question

我正在寻找相当于TreeView.HideSelection = false. 有人有想法吗？

Answer 1

如果我的理解TreeView.HideSelection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>

然后像这样使用样式：

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

默认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>

This changed the highlighting of the selected item when the selection was not active (ie did not have keyboard focus), by removing this trigger the standard highlighting is used even when it does not have focus.