那些遇到过的问题

Horizo​​ntalAlignment =“ Stretch”在TreeViewItem中不起作用

lda*_*dam 2 .net c# wpf xaml

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>
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我希望文本框可以延伸到窗口的宽度，但是您会得到以下信息：

看起来像什么

运行时看起来像什么

键入时，文本框会扩展，这不是我想要的。

我现在正在考虑可以将第二列的宽度设置为的宽度，TreeViewItem但是我不确定该怎么做。

我试过将网格放在各种面板中，但这也不起作用。我还设置HorizontalAlignment并HorizontalContentAlignment以Stretch对文本本身，但也不能正常工作。

这是Grid控件的一些限制吗？将文本框本身放在树状视图中将使其按我的意愿扩展，但是我需要在其旁边放置标签，如果有多个字段，则如果所有文本框都对齐，则看起来会更好。

更新

使用不同的ControlTemplate标题可以拉伸，但内容仍然不能拉伸。

<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>
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结果：

编辑了控制模板

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>
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Pikoh解决方案的结果

小智 6

问题的核心（以及解决方法）如下所述：

默认ControlTemplate使用TreeViewItem3 列 x 2 行的网格，其定义使得内容无法水平拉伸。作者还给出了一种修改后的样式，即更改网格，以便内容可以拉伸。

请注意，修改后的样式将HorizontalContentAlignmentof设置TreeViewItem为Center，并且ControlTemplate使用此属性来对齐内容。

要达到所需的效果，可以在修改后的样式中设置HorizontalContentAlignment为，或者仅覆盖（或特定）上的该属性。StretchTreeViewTreeViewItems

缺少该BasedOn="{StaticResource {x:Type TreeViewItem}}"部分会导致 TreeViewItem 恢复为使用默认值ControlTemplate，以及不可拉伸的网格。

<Style TargetType="TreeViewItem" BasedOn="{StaticResource {x:Type TreeViewItem}}">
    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
</Style>
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在 a 中HierarchicalDataTemplate，可以通过使用该ItemContainerStyle属性来实现该效果。

@pikoh 的派生方法TreeView并TreeViewItem通过修改代码中的网格来实现相同的效果。

完整示例：

<Window x:Class="WpfApp1.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:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <Style 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="{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>
    </Window.Resources>
    <TreeView HorizontalAlignment="Stretch">
        <TreeView.Resources>
            <Style TargetType="TreeViewItem" BasedOn="{StaticResource {x:Type TreeViewItem}}">
                <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
            </Style>
        </TreeView.Resources>
        <TreeViewItem Header="Stuff" HorizontalAlignment="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>
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屏幕截图

Pik*_*koh 5

尝试这样的事情：

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

好的，我在这里找到了一个解决方案。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;
    }
}
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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>
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