WPF 工具包数据网格 : how to get ColumnHeader width to be the same as GridColumn width

Question

对于我的 WPF Toolkit DataGrid，我使用以下自定义列标题样式:

<Style x:Name="ColumnStyle" x:Key="ColumnHeaderStyle" TargetType="my:DataGridColumnHeader">
    <Setter Property="ContentTemplate">
        <Setter.Value>
            <DataTemplate>
                <StackPanel Orientation="Vertical" HorizontalAlignment="Stretch" Background="LightYellow">
                    <TextBlock Text="{Binding Name}" HorizontalAlignment="Stretch" TextAlignment="Left" Background="LightGreen" />
                    <TextBlock Text="{Binding Data}" HorizontalAlignment="Stretch" TextAlignment="Right" Background="LightBlue" />
                </StackPanel>
            </DataTemplate>
        </Setter.Value>
    </Setter>
</Style>

header 的 DataContext 在代码中设置，并且使用 DataGrid 的初始宽度正确显示 Name 和 Data 字符串属性，如下所示:

---------------
|Name         |
|         Data|
---------------

但是，当我调整列大小时，标题显示不会重排，而是保持不变:

--------------------
|Name              |
|         Data     |
--------------------

正如我所期望的那样:

--------------------
|Name              |
|              Data|
--------------------

我需要做什么才能获得上述所需的行为？

同样，标题内容似乎也没有在垂直方向上拉伸(stretch)。

更新:
添加

    <Setter Property="VerticalAlignment">
        <Setter.Value>Bottom</Setter.Value>
    </Setter>

样式似乎正确地将标题与底部对齐。不幸的是，以时尚的方式将 Horizo​​ntalAlignment 属性设置为“Stretch”似乎并没有达到我想要的效果。

Repro 的详细信息:
下面是演示该行为的代码片段。

Window1.xaml:

<Window x:Class="GridTest.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" xmlns:my="http://schemas.microsoft.com/wpf/2008/toolkit">
    <Window.Resources>
        <Style x:Name="ColumnStyle" x:Key="ColumnHeaderStyle" TargetType="my:DataGridColumnHeader">
            <Setter Property="ContentTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <DockPanel>
                            <TextBlock DockPanel.Dock="Left" Text="{Binding Name}" />
                            <TextBlock DockPanel.Dock="Right" Text="{Binding Data}" />
                        </DockPanel>
                    </DataTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <Style x:Name="RowHeaderStyle" x:Key="RowHeaderStyle" TargetType="my:DataGridRowHeader">
            <Setter Property="Content" Value="{Binding}" />
            <Setter Property="ContentTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="{Binding Path=Content.Name, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type my:DataGridRowHeader}}}" 
                                       VerticalAlignment="Center"/>
                            <TextBlock Padding="5">|</TextBlock>
                            <TextBlock Text="{Binding Path=Content.Data, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type my:DataGridRowHeader}}}"
                                       VerticalAlignment="Center"/>
                        </StackPanel>
                    </DataTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
    <Grid>
        <my:DataGrid Name="dg" 
                     ColumnHeaderStyle="{StaticResource ColumnHeaderStyle}"
                     RowHeaderStyle="{StaticResource RowHeaderStyle}"
                     HeadersVisibility="All">
        </my:DataGrid>
    </Grid>
</Window>

以及 Window1.xaml.cs 中的代码隐藏

using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Data;
using Microsoft.Windows.Controls;
using SLModel;

namespace GridTest
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            this.Loaded += new RoutedEventHandler(Window1_Loaded);
        }

        void Window1_Loaded(object sender, RoutedEventArgs e)
        {
            Inputs = new List<Input>();
            Outputs = new List<Output>();

            Input i1 = new Input() { Name = "I 1", Data = "data 1" };
            Input i2 = new Input() { Name = "I 2", Data = "data 2" };
            Input i3 = new Input() { Name = "I 3", Data = "data 3" };


            Inputs.Add(i1); Inputs.Add(i2);

            Output o1 = new Output() { Name = "O 1", Data = "data 1" };
            Output o2 = new Output() { Name = "O 2", Data = "data 2" };
            Output o3 = new Output() { Name = "O 3", Data = "data 3" };

            Outputs.Add(o1); Outputs.Add(o2); Outputs.Add(o3);

            Relationship r1 = new Relationship() { Formula = "F1" };
            Relationship r2 = new Relationship() { Formula = "F2" };
            Relationship r3 = new Relationship() { Formula = "F3" };
            Relationship r4 = new Relationship() { Formula = "F4" };
            Relationship r5 = new Relationship() { Formula = "F5" };
            Relationship r6 = new Relationship() { Formula = "F6" };


            i1.Relationships.Add(r1);
            i1.Relationships.Add(r2);
            i2.Relationships.Add(r3);
            i2.Relationships.Add(r4);
            i3.Relationships.Add(r5);
            i3.Relationships.Add(r6);

            CreateColumn(o1, 0);
            CreateColumn(o2, 1);
            CreateColumn(o3, 2);

            dg.Items.Add(i1);
            dg.Items.Add(i2);
            dg.Items.Add(i3);
            dg.ColumnWidth = DataGridLength.SizeToHeader;
        }

        private void CreateColumn(Output output, int index)
        {
            Binding textBinding = new Binding();
            textBinding.Path = new PropertyPath(string.Format("Relationships[{0}].Formula", index));
            textBinding.Mode = BindingMode.TwoWay;

            DataGridTextColumn tc = new DataGridTextColumn();
            tc.Binding = textBinding;
            dg.Columns.Add(tc);
            tc.Header = output;
        }

        private List<Output> Outputs { get; set; }
        private List<Input> Inputs { get; set; }
    }
}

使用简单的输入、输出和关系类:

公共(public)类输入
{
公共(public)输入()
{
关系 = 新的 ObservableCollection();
}

public string Name { get; set; }
public string Data { get; set; }

public ObservableCollection<Relationship> Relationships { get; set; }

}

公共(public)类输出
{
公共(public)输出(){}

public string Name { get; set; }
public string Data { get; set; }

}

公共(public)类关系
{
公共(public)关系() { }
公共(public)字符串公式 { 获取；放; }
}

复制步骤:

启动应用程序

观察列标题“O 1data 1”、“O 2data 2”和“O 3data 3”

通过向右拖动列分隔符使第一列变宽

观察“名称”文本 block (在本例中为“O 1”)和“数据”文本 block (“数据 1”)之间的距离没有变化，即“数据”文本 block 没有“停靠”到右侧列标题的边缘。

Answer 1

我建议更换您的 StackPanel与 Grid :

<Style x:Name="ColumnStyle" x:Key="ColumnHeaderStyle" TargetType="my:DataGridColumnHeader">
    <Setter Property="ContentTemplate">
        <Setter.Value>
            <DataTemplate>
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="Auto" />
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto" />
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="Auto" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Grid.Row="0" Grid.Column="0" Text="{Binding Name}" Background="LightGreen" />
                    <TextBlock Grid.Row="1" Grid.Column="2" Text="{Binding Data}" Background="LightBlue" />
                </Grid>
            </DataTemplate>
        </Setter.Value>
    </Setter>
</Style>

如果这不起作用，您可能需要编辑 ControlTemplate对于 DataGridColumnHeader .我不确定默认模板是什么样的，但如果 ContentPresenter不位于可拉伸(stretch)容器内(如 Grid )，是否拉伸(stretch) ContentPresenter 内的内容无关紧要，它不会拉伸(stretch)。但有一件事我很确定， StackPanels即使你告诉他们也不要拉伸(stretch)，所以一定要试试 Grid在您的 DataTemplate第一的。

更新(固定)

好的，我挖出了默认的 ControlTemplate对于 DataGridColumnHeader .事实证明确实使用了 Grid ，所以我认为这不是问题。

关键可能是 ContentPresenter :

<ContentPresenter
    SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
    VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
    HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" />

您可能只需要设置 HorizontalContentAlignment="Stretch"在您的 DataGridColumnHeader 上风格。