Question

有谁知道如何隐藏树视图的[ - ]按钮？树视图永远不会崩溃，因此我不需要根节点具有折叠选项。我知道我可以使用带有stye的listview来缩进[0]元素，使其像树视图根节点一样。然而，我正在使用的绑定等类型请求树视图，我不知道如何访问该按钮并禁用它。

Answer 1

这应该有效。您需要修改TreeViewItem的ControlTemplate，[+] / [ - ]按钮实际上是TreeViewItem的ControlTemplate中的ToggleButton所以您需要做的就是将其可见性设置为隐藏或折叠。

创建一个名为“StackOverflowTests”的项目（这样您就不必更改任何内容）并将此代码粘贴到Window1.xaml文件中。应该开箱即用：

    <ControlTemplate x:Key="invisibleButtonTreeViewItemTemplate" TargetType="TreeViewItem" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" MinWidth="19" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition />
            </Grid.RowDefinitions>
            <!-- Make the ToggleButton invisible -->
            <ToggleButton IsChecked="False" Visibility="Hidden" ClickMode="Press" Name="Expander" />
            <Border BorderThickness="{TemplateBinding Border.BorderThickness}" Padding="{TemplateBinding Control.Padding}" BorderBrush="{TemplateBinding Border.BorderBrush}" Background="{TemplateBinding Panel.Background}" Name="Bd" SnapsToDevicePixels="True" Grid.Column="1">
                <ContentPresenter Content="{TemplateBinding HeaderedContentControl.Header}" ContentTemplate="{TemplateBinding HeaderedContentControl.HeaderTemplate}" ContentStringFormat="{TemplateBinding HeaderedItemsControl.HeaderStringFormat}" ContentSource="Header" Name="PART_Header" HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" />
            </Border>
            <ItemsPresenter Name="ItemsHost" Grid.Column="1" Grid.Row="1" Grid.ColumnSpan="2" />
        </Grid>
        <ControlTemplate.Triggers>
            <!-- Remove this trigger so it does not collapse on double click or-->
            <!--<Trigger Property="TreeViewItem.IsExpanded">
                <Setter Property="UIElement.Visibility" TargetName="ItemsHost">
                    <Setter.Value>
                        <x:Static Member="Visibility.Collapsed" />
                    </Setter.Value>
                </Setter>
                <Trigger.Value>
                    <s:Boolean>False</s:Boolean>
                </Trigger.Value>
            </Trigger>-->
            <Trigger Property="ItemsControl.HasItems">
                <Setter Property="UIElement.Visibility" TargetName="Expander">
                    <Setter.Value>
                        <x:Static Member="Visibility.Hidden" />
                    </Setter.Value>
                </Setter>
                <Trigger.Value>
                    <s:Boolean>False</s:Boolean>
                </Trigger.Value>
            </Trigger>
            <Trigger Property="TreeViewItem.IsSelected">
                <Setter Property="Panel.Background" TargetName="Bd">
                    <Setter.Value>
                        <DynamicResource ResourceKey="{x:Static SystemColors.HighlightBrushKey}" />
                    </Setter.Value>
                </Setter>
                <Setter Property="TextElement.Foreground">
                    <Setter.Value>
                        <DynamicResource ResourceKey="{x:Static SystemColors.HighlightTextBrushKey}" />
                    </Setter.Value>
                </Setter>
                <Trigger.Value>
                    <s:Boolean>True</s:Boolean>
                </Trigger.Value>
            </Trigger>
            <MultiTrigger>
                <MultiTrigger.Conditions>
                    <Condition Property="TreeViewItem.IsSelected">
                        <Condition.Value>
                            <s:Boolean>True</s:Boolean>
                        </Condition.Value>
                    </Condition>
                    <Condition Property="Selector.IsSelectionActive">
                        <Condition.Value>
                            <s:Boolean>False</s:Boolean>
                        </Condition.Value>
                    </Condition>
                </MultiTrigger.Conditions>
                <Setter Property="Panel.Background" TargetName="Bd">
                    <Setter.Value>
                        <DynamicResource ResourceKey="{x:Static SystemColors.ControlBrushKey}" />
                    </Setter.Value>
                </Setter>
                <Setter Property="TextElement.Foreground">
                    <Setter.Value>
                        <DynamicResource ResourceKey="{x:Static SystemColors.ControlTextBrushKey}" />
                    </Setter.Value>
                </Setter>
            </MultiTrigger>
            <Trigger Property="UIElement.IsEnabled">
                <Setter Property="TextElement.Foreground">
                    <Setter.Value>
                        <DynamicResource ResourceKey="{x:Static SystemColors.GrayTextBrushKey}" />
                    </Setter.Value>
                </Setter>
                <Trigger.Value>
                    <s:Boolean>False</s:Boolean>
                </Trigger.Value>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>

    <Style TargetType="{x:Type TreeViewItem}">

        <Setter Property="Template" Value="{StaticResource invisibleButtonTreeViewItemTemplate}" />
    </Style>

</Window.Resources>
<TreeView>
    <TreeViewItem Header="Item 1" IsExpanded="True">
        <TreeViewItem Header="Item 1.1" IsExpanded="True" />
        <TreeViewItem Header="Item 1.2" IsExpanded="True">
            <TreeViewItem Header="Item 1.2.1" IsExpanded="True" />
        </TreeViewItem>
    </TreeViewItem>
    <TreeViewItem Header="Item 2" IsExpanded="True">
        <TreeViewItem Header="Item 2.1" IsExpanded="True" />
    </TreeViewItem>
</TreeView>

Answer 2

我最近实施了这个。在TreeView控件上我只设置：

IsHitTestVisible="False"

并添加到我的app.xaml：

<Style TargetType="TreeViewItem">
    <Setter Property="IsExpanded" Value="True" />
</Style>

虽然这样就无法选择任何TreeViewItems。我之所以这么做是因为我想要一些数据的简单层次表示。

Treeview隐藏[+] [ - ]按钮

2 个答案: