带有拉伸的TreeViewItem

我想创建一个WPF TreeView，其中包含可扩展以填充可用空间的TreeViewItems。我以此为指南修改了TreeViewItem模板：https : //social.msdn.microsoft.com/Forums/vstudio/en-US/cabcb3ba-80c0-4367-85b7-9b55adc81e65/stretch-treeview-items?forum=wpf这很好用，因为我希望右侧的一个字符网格组件右对齐，并使长的TextBlock占用可用空间-请参见下面的代码，其中我的TreeViewItems的标题是网格。

但是，当我通过向右向左拖动来调整窗口大小时，当没有足够的空间容纳所有网格组件时，我期待的是带有内容“长，长，...”的长文本块。以开始缩小宽度，但右侧的TextBlocks被右侧窗口边缘切断。

如果我创建一个全新的带有网格的示例并将上述网格放在一个网格单元中（本质上是模拟TreeView模板中使用的网格），那么它将按照我的预期进行调整大小：TextBlock在我调整大小时会缩小宽度。

任何想法我可以对TreeViewItem模板或指定的Header进行哪些更改以获取所需的调整大小行为？

<Window x:Class="TreeViewSimple3.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:TreeViewSimple3"
    mc:Ignorable="d"
    Title="MainWindow" Height="350" Width="525">

<Window.Resources>
    <ControlTemplate x:Key="TreeViewItemStretchControlTemplate" 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="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" Grid.ColumnSpan="2" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="True">
                <ContentPresenter x:Name="PART_Header" ContentSource="Header"
                HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}"
                SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}"/>

            </Border>
            <ItemsPresenter x:Name="ItemsHost" Grid.ColumnSpan="2" Grid.Column="1" Grid.Row="1"/>
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="TreeViewItem.IsExpanded" Value="false">
                <Setter TargetName="ItemsHost" Property="UIElement.Visibility" Value="Collapsed"/>
            </Trigger>
            <Trigger Property="ItemsControl.HasItems" Value="false">
                <Setter TargetName="Expander" Property="UIElement.Visibility" Value="Hidden"/>
            </Trigger>
            <Trigger Property="TreeViewItem.IsSelected" Value="true">
                <Setter TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"
                    Property="Border.Background"/>
                <Setter Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"
                    Property="Control.Foreground"/>
            </Trigger>
            <MultiTrigger>
                <MultiTrigger.Conditions>
                    <Condition Property="TreeViewItem.IsSelected" Value="true"/>
                    <Condition Property="TreeViewItem.IsSelectionActive" Value="false"/>
                </MultiTrigger.Conditions>
                <Setter TargetName="Bd"
                    Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"
                    Property="Border.Background"/>
                <Setter Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}}"
                    Property="Control.Foreground"/>
            </MultiTrigger>
            <Trigger Property="UIElement.IsEnabled" Value="false">
                <Setter Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" Property="Control.Foreground"/>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>
</Window.Resources>

<TreeView>
    <TreeViewItem Header="Parent" Template="{StaticResource TreeViewItemStretchControlTemplate}" HorizontalContentAlignment="Stretch">
        <TreeViewItem Template="{StaticResource TreeViewItemStretchControlTemplate}" HorizontalContentAlignment="Stretch">
            <TreeViewItem.Header>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*"/>
                        <ColumnDefinition Width="Auto"/>
                    </Grid.ColumnDefinitions>
                    <TextBlock Grid.Column="0" Text="A long, long, long, long, long, long, long label."/>
                    <StackPanel Grid.Column="1" Orientation="Horizontal">
                        <TextBlock Text="A"/>
                        <TextBlock Text="B"/>
                        <TextBlock Text="C"/>
                        <TextBlock Text="D"/>
                    </StackPanel>
                </Grid>
            </TreeViewItem.Header>
        </TreeViewItem>
    </TreeViewItem>
</TreeView>