Horizo​​ntalAlignment="Stretch" 在 TreeViewItem 中不起作用

这是一个不起作用的示例：

<Window x:Class="WpfApplication2.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:WpfApplication2"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <TreeView HorizontalAlignment="Stretch">
        <TreeViewItem Header="Stuff" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch">
            <Grid HorizontalAlignment="Stretch">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="auto"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <Label Grid.Column="0">Some random text</Label>
                <TextBox Grid.Column="1"></TextBox>

            </Grid>
        </TreeViewItem>
    </TreeView>
</Window>

我希望文本框拉伸到窗口的宽度，但你得到的是：

文本框会随着您的输入而扩展，这不是我想要的。

我现在想可能可以将第二列的宽度设置为TreeViewItem但我不知道该怎么做。

我尝试过将网格放入各种面板中，但这也不起作用。我也设置了HorizontalAlignment and HorizontalContentAlignment to Stretch在文本框本身上，但这也不起作用。

这是一些限制吗Grid控制？将文本框单独放入树视图中将使其按照我的需要展开，但我需要将标签放在它旁边，如果有多个字段，如果所有文本框都对齐，它看起来会好得多。

UPDATE

使用不同的ControlTemplate允许标题拉伸，但内容仍然不拉伸。

<TreeView HorizontalAlignment="Stretch">
        <TreeViewItem Style="{DynamicResource StretchableTreeViewItemTemplate}" HorizontalAlignment="Stretch" Header="Stuff">
            <Grid HorizontalAlignment="Stretch">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <Label Grid.Column="0">Some random text</Label>
                <TextBox Grid.Column="1" HorizontalAlignment="Stretch"></TextBox>
            </Grid>
        </TreeViewItem>
    </TreeView>



<Style x:Key="StretchableTreeViewItemTemplate" TargetType="TreeViewItem"
   BasedOn="{StaticResource {x:Type TreeViewItem}}">
        <Setter Property="HorizontalContentAlignment"
      Value="Center" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="TreeViewItem">
                    <StackPanel>
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto"
                            MinWidth="19" />
                                <ColumnDefinition Width="*" />
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto" />
                                <RowDefinition />
                            </Grid.RowDefinitions>
                            <!--
                         Note that the following do not work, but I believe the top 2 should?!
                         <ToggleButton IsChecked="{TemplateBinding IsExpanded}" ClickMode="Press" Name="Expander">
                         <ToggleButton IsChecked="{TemplateBinding Property=IsExpanded}" ClickMode="Press" Name="Expander">
                         <ToggleButton IsChecked="{TemplateBinding Path=IsExpanded}" ClickMode="Press" Name="Expander">
                    -->
                            <ToggleButton IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource TemplatedParent}}"
                      ClickMode="Press"
                      Name="Expander">
                                <ToggleButton.Style>
                                    <Style TargetType="ToggleButton">
                                        <Setter Property="UIElement.Focusable"
                      Value="false" />
                                        <Setter Property="FrameworkElement.Width"
                      Value="16" />
                                        <Setter Property="FrameworkElement.Height"
                      Value="16" />
                                        <Setter Property="Control.Template">
                                            <Setter.Value>
                                                <ControlTemplate TargetType="ToggleButton">
                                                    <Border Padding="5,5,5,5"
                            Background="#00FFFFFF"
                            Width="16"
                            Height="16">
                                                        <Path Fill="#00FFFFFF"
                            Stroke="#FF989898"
                            Name="ExpandPath">
                                                            <Path.Data>
                                                                <PathGeometry Figures="M0,0L0,6L6,0z" />
                                                            </Path.Data>
                                                            <Path.RenderTransform>
                                                                <RotateTransform Angle="135"
                                           CenterX="3"
                                           CenterY="3" />
                                                            </Path.RenderTransform>
                                                        </Path>
                                                    </Border>
                                                    <ControlTemplate.Triggers>
                                                        <Trigger Property="UIElement.IsMouseOver"
                               Value="True">
                                                            <Setter TargetName="ExpandPath"
                                Property="Shape.Stroke"
                                Value="#FF1BBBFA" />
                                                            <Setter TargetName="ExpandPath"
                                Property="Shape.Fill"
                                Value="#00FFFFFF" />
                                                        </Trigger>
                                                        <Trigger Property="ToggleButton.IsChecked"
                               Value="True">
                                                            <Setter TargetName="ExpandPath"
                                Property="UIElement.RenderTransform">
                                                                <Setter.Value>
                                                                    <RotateTransform Angle="180"
                                             CenterX="3"
                                             CenterY="3" />
                                                                </Setter.Value>
                                                            </Setter>
                                                            <Setter TargetName="ExpandPath"
                                Property="Shape.Fill"
                                Value="#FF595959" />
                                                            <Setter TargetName="ExpandPath"
                                Property="Shape.Stroke"
                                Value="#FF262626" />
                                                        </Trigger>
                                                    </ControlTemplate.Triggers>
                                                </ControlTemplate>
                                            </Setter.Value>
                                        </Setter>
                                    </Style>
                                </ToggleButton.Style>
                            </ToggleButton>
                            <Border x:Name="Bd"
                HorizontalAlignment="Stretch"
                BorderThickness="{TemplateBinding Border.BorderThickness}"
                BorderBrush="{TemplateBinding Border.BorderBrush}"
                Padding="{TemplateBinding Control.Padding}"
                Background="{TemplateBinding Panel.Background}"
                SnapsToDevicePixels="True"
                Grid.Column="1">
                                <ContentPresenter x:Name="PART_Header"
                            Content="{TemplateBinding HeaderedContentControl.Header}"
                            ContentTemplate="{TemplateBinding HeaderedContentControl.HeaderTemplate}"
                            ContentStringFormat="{TemplateBinding HeaderedItemsControl.HeaderStringFormat}"
                            ContentTemplateSelector="{TemplateBinding HeaderedItemsControl.HeaderTemplateSelector}"
                            ContentSource="Header"
                            HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}"
                            SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" />
                            </Border>
                            <ItemsPresenter x:Name="ItemsHost"
                        Grid.Column="1"
                        Grid.Row="1" />
                        </Grid>
                    </StackPanel>
                    <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"
                Property="Panel.Background"
                Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}" />
                            <Setter Property="TextElement.Foreground"
                Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}" />
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="TreeViewItem.IsSelected"
                     Value="True" />
                                <Condition Property="Selector.IsSelectionActive"
                     Value="False" />
                            </MultiTrigger.Conditions>
                            <Setter TargetName="Bd"
                Property="Panel.Background"
                Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" />
                            <Setter Property="TextElement.Foreground"
                Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
                        </MultiTrigger>
                        <Trigger Property="UIElement.IsEnabled"
               Value="False">
                            <Setter Property="TextElement.Foreground"
                Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Results:

尝试使用 Pikoh 的解决方案：

<local:StretchingTreeView HorizontalAlignment="Stretch">
    <local:StretchingTreeViewItem HorizontalAlignment="Stretch" Header="Stuff">
        <Grid HorizontalAlignment="Stretch">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Label Grid.Column="0">Some random text</Label>
            <TextBox Grid.Column="1" HorizontalAlignment="Stretch"></TextBox>
        </Grid>
    </local:StretchingTreeViewItem>
</local:StretchingTreeView>

尝试这样的事情：

<TextBox Grid.Column="1" Width="{Binding Path=ActualWidth, RelativeSource={RelativeSource AncestorType={x:Type Grid}}, Mode=OneWay}"></TextBox>

Edit

好的，我找到了一个解决方案Here http://blogs.msdn.com/b/jpricket/archive/2008/08/05/wpf-a-stretching-treeview.aspx。它基本上创建了一个继承 Treeview 的新类：

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

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

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

    private void StretchingTreeViewItem_Loaded(object sender, RoutedEventArgs e)
    {
        // The purpose of this code is to stretch the Header Content all the way accross the TreeView. 
        if (this.VisualChildrenCount > 0)
        {
            Grid grid = this.GetVisualChild(0) as Grid;
            if (grid != null && grid.ColumnDefinitions.Count == 3)
            {
                // Remove the middle column which is set to Auto and let it get replaced with the 
                // last column that is set to Star.
                grid.ColumnDefinitions.RemoveAt(1);
            }
        }
    }

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

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

用法示例：

<Window x:Class="WpfApplication2.Window2"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication2"
    Title="Window2" Height="300" Width="300">
<Grid>

    <local:StretchingTreeView HorizontalAlignment="Stretch" >

        <local:StretchingTreeViewItem Header="Stuff" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch" >
            <Grid HorizontalAlignment="Stretch" >
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="auto"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <Label Grid.Column="0">Some random text</Label>
                <TextBox Grid.Column="1" ></TextBox>

            </Grid>
        </local:StretchingTreeViewItem>
    </local:StretchingTreeView>
</Grid>