WPF：滚动项目控制内容固定标题

是否可以使用 WPF 的 ItemsControl 执行类似的操作：Demo

我正在尝试冻结 GroupedItems 而不是 GridView 列。

资源：

<Window.Resources>
    <CollectionViewSource x:Key="data" Source="{Binding}">
        <CollectionViewSource.GroupDescriptions>
            <PropertyGroupDescription PropertyName="Date"/>
        </CollectionViewSource.GroupDescriptions>
    </CollectionViewSource>
</Window.Resources>

列表显示：

<ListView Grid.Column="0" ItemsSource="{Binding Source={StaticResource data}}">
    <ListView.View>
        <GridView>
            <GridView.Columns>
                <GridViewColumn Header="Col 1" DisplayMemberBinding="{Binding Col1}" Width="100"/>
                <GridViewColumn Header="Col 2" DisplayMemberBinding="{Binding Col2}" Width="100"/>
                <GridViewColumn Header="Col 3" DisplayMemberBinding="{Binding Col3}" Width="100"/>
            </GridView.Columns>
        </GridView>
    </ListView.View>
    <ListView.GroupStyle>
        <GroupStyle>
            <GroupStyle.ContainerStyle>
                <Style TargetType="{x:Type GroupItem}">
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type GroupItem}">
                                <Grid>
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="Auto"/>
                                        <RowDefinition Height="Auto"/>
                                    </Grid.RowDefinitions>
                                    <Grid Grid.Row="0">
                                        <TextBlock Background="Beige" FontWeight="Bold" Text="{Binding Path=Name, StringFormat={}{0}}"/>
                                    </Grid>
                                    <DockPanel Grid.Row="1">
                                        <ItemsPresenter Grid.Row="2"></ItemsPresenter>
                                    </DockPanel>
                                </Grid>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </GroupStyle.ContainerStyle>
        </GroupStyle>
    </ListView.GroupStyle>
</ListView>

背后代码：

public MainWindow()
{
    InitializeComponent();

    List<String> colList1 = new List<string>() { "Item1", "Item2", "Item3", "Item4", "Item5", "Item6", "Item7" };
    List<String> colList2 = new List<string>() { "1", "2", "3", "4", "5", "6" };

    ObservableCollection<Data> dataCollection = new ObservableCollection<Data>();

    for (var a = 0; a < 100; a++)
    {
        Random rnd = new Random();
        int min = rnd.Next(5000);
        int rnd1 = rnd.Next(0, 6);
        int rnd2 = rnd.Next(0, 5);

        dataCollection.Add(new Data()
        {
            Date = DateTime.Now.AddMinutes(min).ToString("hh:MM tt"),
            Col1 = colList1[rnd2],
            Col2 = String.Format("Col2: {0}", "X"),
            Col3 = colList2[rnd2]
        });
    }
    this.DataContext = dataCollection;
}

public class Data
{
    public string Date { get; set; }
    public string Col1 { get; set; }
    public string Col2 { get; set; }
    public string Col3 { get; set; }
}

我的解决方案使用共享组标题样式的 TextBlock 覆盖。定位和正确的命中测试是棘手的部分，但我非常有信心这不会因布局或逻辑的微小变化而中断。

我不确定您是否想隐藏 ColumnHeader，但这很简单，除了所描述的内容之外不需要任何其他调整here.

背后代码：

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace WpfApplication1
{
    public partial class FreezingGroupHeader : UserControl
    {
        private double _listviewHeaderHeight;
        private double _listviewSideMargin;

        public FreezingGroupHeader()
        {
            InitializeComponent();

            List<String> colList1 = new List<string>() { "Item1", "Item2", "Item3", "Item4", "Item5", "Item6", "Item7" };
            List<String> colList2 = new List<string>() { "1", "2", "3", "4", "5", "6" };

            ObservableCollection<Data> dataCollection = new ObservableCollection<Data>();

            Random rnd = new Random();

            for (var a = 0; a < 100; a++)
            {
                int min = rnd.Next(5000);
                int rnd1 = rnd.Next(0, 6);
                int rnd2 = rnd.Next(0, 5);

                dataCollection.Add(
                    new Data()
                    {
                        Date = DateTime.Now.AddMinutes(min).ToString("hh:MM tt"),
                        Col1 = colList1[rnd2],
                        Col2 = String.Format("Col2: {0}", "X"),
                        Col3 = colList2[rnd2]
                    }
                );
            }
            this.DataContext = dataCollection;

            this.Loaded += OnLoaded;
        }

        private void OnLoaded(object sender, RoutedEventArgs e)
        {
            // Position frozen header
            GetListViewMargins(this.listview1);

            Thickness margin = this.frozenGroupHeader.Margin;
            margin.Top = _listviewHeaderHeight;
            margin.Right = SystemParameters.VerticalScrollBarWidth + _listviewSideMargin;
            margin.Left = _listviewSideMargin;

            this.frozenGroupHeader.Margin = margin;

            UpdateFrozenGroupHeader();
        }

        private void listview1_ScrollChanged(object sender, ScrollChangedEventArgs e)
        {
            UpdateFrozenGroupHeader();
        }

        /// <summary>
        /// Sets text and visibility of frozen header
        /// </summary>
        private void UpdateFrozenGroupHeader()
        {
            if (listview1.HasItems)
            {
                // Text of frozenGroupHeader
                GroupItem group = GetFirstVisibleGroupItem(this.listview1);
                if (group != null)
                {
                    object data = group.Content;
                    this.frozenGroupHeader.Text = data.GetType().GetProperty("Name").GetValue(data, null) as string;  // slight hack
                }
                this.frozenGroupHeader.Visibility = Visibility.Visible;
            }
            else
                this.frozenGroupHeader.Visibility = Visibility.Collapsed;
        }

        /// <summary>
        /// Sets values that will be used in the positioning of the frozen header
        /// </summary>
        private void GetListViewMargins(ListView listview)
        {
            if (listview.HasItems)
            {
                object o = listview.Items[0];
                ListViewItem firstItem = (ListViewItem)listview.ItemContainerGenerator.ContainerFromItem(o);
                if (firstItem != null)
                {
                    GroupItem group = FindUpVisualTree<GroupItem>(firstItem);
                    Point p = group.TranslatePoint(new Point(0, 0), listview);
                    _listviewHeaderHeight = p.Y; // height of columnheader
                    _listviewSideMargin = p.X; // listview borders
                }
            }
        }

        /// <summary>
        /// Gets the first visible GroupItem in the listview
        /// </summary>
        private GroupItem GetFirstVisibleGroupItem(ListView listview)
        {
            HitTestResult hitTest = VisualTreeHelper.HitTest(listview, new Point(5, _listviewHeaderHeight + 5));
            GroupItem group = FindUpVisualTree<GroupItem>(hitTest.VisualHit);
            return group;
        }


        /// <summary>
        /// walk up the visual tree to find object of type T, starting from initial object
        /// http://www.codeproject.com/Tips/75816/Walk-up-the-Visual-Tree
        /// </summary>
        private static T FindUpVisualTree<T>(DependencyObject initial) where T : DependencyObject
        {
            DependencyObject current = initial;

            while (current != null && current.GetType() != typeof(T))
            {
                current = VisualTreeHelper.GetParent(current);
            }
            return current as T;
        }

        public class Data
        {
            public string Date { get; set; }
            public string Col1 { get; set; }
            public string Col2 { get; set; }
            public string Col3 { get; set; }
        }
    }
}

Xaml:

<UserControl x:Class="WpfApplication1.FreezingGroupHeader"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300"
           >

    <UserControl.Resources>
        <CollectionViewSource x:Key="data" Source="{Binding}">
            <CollectionViewSource.GroupDescriptions>
                <PropertyGroupDescription PropertyName="Date"/>
            </CollectionViewSource.GroupDescriptions>
        </CollectionViewSource>

        <Style x:Key="GroupHeaderStyle1" TargetType="{x:Type TextBlock}">
            <Setter Property="Background" Value="Beige" />
            <Setter Property="Foreground" Value="Black" />
            <Setter Property="FontWeight" Value="Bold" />
        </Style>
    </UserControl.Resources>

    <Grid>
        <ListView x:Name="listview1" Grid.Column="0" ItemsSource="{Binding Source={StaticResource data}}" ScrollViewer.ScrollChanged="listview1_ScrollChanged" >
            <ListView.View>
                <GridView>
                    <GridView.Columns>
                        <GridViewColumn Header="Col 1" DisplayMemberBinding="{Binding Col1}" Width="100"/>
                        <GridViewColumn Header="Col 2" DisplayMemberBinding="{Binding Col2}" Width="100"/>
                        <GridViewColumn Header="Col 3" DisplayMemberBinding="{Binding Col3}" Width="100"/>
                    </GridView.Columns>
                </GridView>
            </ListView.View>
            <ListView.GroupStyle>
                <GroupStyle>
                    <GroupStyle.ContainerStyle>
                        <Style TargetType="{x:Type GroupItem}">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="{x:Type GroupItem}">
                                        <Grid>
                                            <Grid.RowDefinitions>
                                                <RowDefinition  Height="Auto"/>
                                                <RowDefinition Height="Auto"/>
                                            </Grid.RowDefinitions>
                                            <Grid Grid.Row="0">
                                                <Grid.ColumnDefinitions>
                                                    <ColumnDefinition Width="*"/>
                                                </Grid.ColumnDefinitions>
                                                <TextBlock Style="{StaticResource GroupHeaderStyle1}" Text="{Binding Name, StringFormat={}{0}}"  />
                                            </Grid>
                                            <DockPanel Grid.Row="1">
                                                <ItemsPresenter Grid.Row="2"></ItemsPresenter>
                                            </DockPanel>
                                        </Grid>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </GroupStyle.ContainerStyle>
                </GroupStyle>
            </ListView.GroupStyle>
        </ListView>
        <TextBlock x:Name="frozenGroupHeader" Style="{StaticResource GroupHeaderStyle1}" VerticalAlignment="Top"/>
    </Grid>
</UserControl>