wpf - 如何拉伸(stretch) TreeViewItem 宽度以填充父项？

Question

我有一个 WPF TreeView，我想将 TreeViewItem 扩展到整个空间，就像它的父级一样。

<TreeView Name="treeFamilies" AllowDrop="True" >
    <TreeView.Resources>
        <HierarchicalDataTemplate DataType="{x:Type local:MyNode}" ItemsSource="{Binding Members}">
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding Name}" Background="LightGray"/>
                <TextBlock Text=" [" Foreground="Blue" Background="LightGray"/>
                <TextBlock Text="{Binding Members.Count}" Foreground="Blue" Background="LightGray"/>
                <TextBlock Text="]" Foreground="Blue" Background="LightGray" />
            </StackPanel>
        </HierarchicalDataTemplate>
    </TreeView.Resources>
    <TreeView.ItemContainerStyle>
        <Style TargetType="{x:Type TreeViewItem}">
            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        </Style>
    </TreeView.ItemContainerStyle>
</TreeView>

看来我正在使用 ItemContainer 样式 <Setter Property="HorizontalContentAlignment" Value="Stretch"/>错。我现在的树看起来像这张照片:



我希望拉伸(stretch)灰色背景以填充 TreeView 控件的整个末端。
我怎么能做到这一点？

Answer 1

Form Il Vic 的评论，this msdn blog显示了从 TreeViewItem 中删除最后一列的类似 hack 的方法.

万一博客关闭，我在这里复制我的工作代码。在 TreeViewItem 之后已加载，我删除了第三个 ColumnDefinition从网格中，设置第二个 ColumnDefinition宽度为 * ;

public class StretchingTreeViewItem : TreeViewItem
{
    public StretchingTreeViewItem()
    {
        this.Loaded += new RoutedEventHandler(StretchingTreeViewItem_Loaded);
    }

    private void StretchingTreeViewItem_Loaded(object sender, RoutedEventArgs e)
    {
        if (this.VisualChildrenCount > 0)
        {
            Grid grid = this.GetVisualChild(0) as Grid;
            if (grid != null && grid.ColumnDefinitions.Count == 3)
            {
                grid.ColumnDefinitions.RemoveAt(2);
                grid.ColumnDefinitions[1].Width = new GridLength(1, GridUnitType.Star);
            }
        }
    }

    protected override DependencyObject GetContainerForItemOverride()
    {
        return new StretchingTreeViewItem();
    }

    protected override bool IsItemItsOwnContainerOverride(object item)
    {
        return item is StretchingTreeViewItem;
    }
}

然后我覆盖 TreeView获取自定义项目。

public class StretchingTreeView : TreeView
{
    protected override DependencyObject GetContainerForItemOverride()
    {
        return new StretchingTreeViewItem();
    }

    protected override bool IsItemItsOwnContainerOverride(object item)
    {
        return item is StretchingTreeViewItem;
    }        
}