WPF: Scroll ItemControl Inhalt Fester Kopf

Question

Ist es möglich, so etwas wie dies mit WPF Items zu tun: Demo

ich die GroupedItems versuchen eher zu frieren als die Gridview Spalten.

Ressourcen:

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

Listview:

<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"> 
             <Grid.ColumnDefinitions> 
              <ColumnDefinition Width="*"/> 
             </Grid.ColumnDefinitions> 
             <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> 

Code hinter:

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; } 
      } 

Answer 1

Diese Lösung ist nicht groß, und es ist hack-ish, aber es wird Ich mache im Grunde, was Sie wollen. Ich habe die Listenansicht-Header unsichtbar gemacht, einen Textblock über die Listenansicht gesetzt und den Textwert auf das Gruppenelement des ersten sichtbaren Elements in der Listbox gesetzt. Hacky, aber es ist das Beste, was ich mir ausgedacht habe.

public partial class MainWindow : Window 
{ 

    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; } 
    } 

    private void grid_ScrollChanged(object sender, ScrollChangedEventArgs e) 
    { 
     if (grid.Items.Count > 0) 
     { 
      HitTestResult hitTest = VisualTreeHelper.HitTest(grid, new Point(5, 5)); 
      System.Windows.Controls.ListViewItem item = GetListViewItemFromEvent(null, hitTest.VisualHit) as System.Windows.Controls.ListViewItem; 
      if (item != null) 
       Head.Text = ((Data)item.Content).Date; 
     } 

    } 

    System.Windows.Controls.ListViewItem GetListViewItemFromEvent(object sender, object originalSource) 
    { 
     DependencyObject depObj = originalSource as DependencyObject; 
     if (depObj != null) 
     { 
      // go up the visual hierarchy until we find the list view item the click came from 
      // the click might have been on the grid or column headers so we need to cater for this 
      DependencyObject current = depObj; 
      while (current != null && current != grid) 
      { 
       System.Windows.Controls.ListViewItem ListViewItem = current as System.Windows.Controls.ListViewItem; 
       if (ListViewItem != null) 
       { 
        return ListViewItem; 
       } 
       current = VisualTreeHelper.GetParent(current); 
      } 
     } 

     return null; 
    } 

} 

XAML:

<Window x:Class="header.MainWindow" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Title="MainWindow" Height="350" Width="auto" SizeToContent="Width"> 
<Window.Resources> 
    <CollectionViewSource x:Key="data" Source="{Binding}"> 
     <CollectionViewSource.GroupDescriptions> 
      <PropertyGroupDescription PropertyName="Date"/> 
     </CollectionViewSource.GroupDescriptions> 
    </CollectionViewSource> 

    <Style x:Key="myHeaderStyle" TargetType="{x:Type GridViewColumnHeader}"> 
     <Setter Property="Visibility" Value="Collapsed" /> 
    </Style> 
</Window.Resources> 
<Grid> 
    <StackPanel> 
    <TextBlock Name="Head" Grid.Row="0"/> 
      <ListView Name="grid" Grid.Column="0" Grid.Row="1" ItemsSource="{Binding Source={StaticResource data}}" Height="300" ScrollViewer.ScrollChanged="grid_ScrollChanged"> 
       <ListView.View> 
        <GridView ColumnHeaderContainerStyle="{StaticResource myHeaderStyle}"> 
         <GridView.Columns> 
          <GridViewColumn DisplayMemberBinding="{Binding Col1}" Width="100"/> 
          <GridViewColumn DisplayMemberBinding="{Binding Col2}" Width="100"/> 
          <GridViewColumn 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 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> 
    </StackPanel> 
</Grid> 

EDIT: Fest ScrollChanged Ereignis.

private void grid_ScrollChanged(object sender, ScrollChangedEventArgs e) 
    { 
     if (grid.Items.Count > 0) 
     { 
      Point point = new Point(5, 5); 
      foreach(Data lvItem in grid.Items) 
      { 
       HitTestResult hitTest = VisualTreeHelper.HitTest(grid, point); 
       ListViewItem item = GetListViewItemFromEvent(null, hitTest.VisualHit) as System.Windows.Controls.ListViewItem; 
       if (item != null) 
       { 
        Data value = ((Data)item.Content); 
        Head.Text = ((Data)item.Content).Date; 
        break; 
       } 
       else 
       { 
        point.X += 5; 
        point.Y += 5; 
       } 
      } 
     } 

    } 

Answer 2

Meine Lösung verwendet ein TextBlock-Overlay, das den Gruppenkopfstil teilt. Die Positionierung und korrekte HitTesting ist der schwierige Teil, aber ich bin ziemlich zuversichtlich, dass dies für kleine Änderungen in Layout oder Logik nicht bricht.

Ich war mir nicht sicher, ob Sie den ColumnHeader ausblenden möchten oder nicht, aber das ist einfach und erfordert keine anderen Einstellungen als das, was dargestellt wird here.

-Code hinter:

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> 

Answer 3

Wie ich gerade lief in ein ähnliches Problem und die 'hack-ish' Lösung nicht meine Bedürfnisse passen und Normalerweise mag ich keine "hack-ish" -Stücke in Produktionsumgebungen, ich habe eine generische Lösung entwickelt, die ich gerne teilen würde. Die beigefügte Klasse hat folgende Schlüsselfunktionen:

• MVVM kompatibel
• keine Codebehind
• kompatibel mit Listview, Gridview, Items, auch statische XAML! - sollte mit etwas arbeiten mit einem ScollViewer ...
• Verwendet angebracht Eigenschaft der Gruppe Artikel

XAML-Verwendung (nur Ihre innere Control) zu erklären:

<ControlTemplate TargetType="{x:Type GroupItem}"> 
    <Grid> 
     <Grid.RowDefinitions> 
      <RowDefinition Height="Auto"/> 
      <RowDefinition Height="Auto"/> 
     </Grid.RowDefinitions> 
     <Grid Grid.Row="0" local:StickyScrollHeader.AttachToControl="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Grid}}"> 
      <TextBlock Background="Beige" FontWeight="Bold" Text="{Binding Path=Name, StringFormat={}{0}}"/> 
      <Grid.ColumnDefinitions> 
       <ColumnDefinition Width="*"/> 
      </Grid.ColumnDefinitions> 
     </Grid> 
     <DockPanel Grid.Row="1"> 
      <ItemsPresenter Grid.Row="2"></ItemsPresenter> 
     </DockPanel> 
    </Grid> 
</ControlTemplate> 

Die Klasse (überall setzen, XAML-Namespace bei Bedarf hinzugefügt werden):

public static class StickyScrollHeader 
{ 
    public static FrameworkElement GetAttachToControl(FrameworkElement obj) 
    { 
     return (FrameworkElement)obj.GetValue(AttachToControlProperty); 
    } 

    public static void SetAttachToControl(FrameworkElement obj, FrameworkElement value) 
    { 
     obj.SetValue(AttachToControlProperty, value); 
    } 

    private static ScrollViewer FindScrollViewer(FrameworkElement item) 
    { 
     FrameworkElement treeItem = item; 
     FrameworkElement directItem = item; 

     while (treeItem != null) 
     { 
      treeItem = VisualTreeHelper.GetParent(treeItem) as FrameworkElement; 
      if (treeItem is ScrollViewer) 
      { 
       return treeItem as ScrollViewer; 
      } 
      else if (treeItem is ScrollContentPresenter) 
      { 
       return (treeItem as ScrollContentPresenter).ScrollOwner; 
      } 
     } 

     while (directItem != null) 
     { 
      directItem = directItem.Parent as FrameworkElement; 

      if (directItem is ScrollViewer) 
      { 
       return directItem as ScrollViewer; 
      } 
      else if (directItem is ScrollContentPresenter) 
      { 
       return (directItem as ScrollContentPresenter).ScrollOwner; 
      } 
     } 

     return null; 
    } 

    private static ScrollContentPresenter FindScrollContentPresenter(FrameworkElement sv) 
    { 
     int childCount = VisualTreeHelper.GetChildrenCount(sv); 

     for (int i = 0; i < childCount; i++) 
     { 
      if (VisualTreeHelper.GetChild(sv, i) is FrameworkElement child && child is ScrollContentPresenter) 
      { 
       return child as ScrollContentPresenter; 
      } 
     } 

     for (int i = 0; i < childCount; i++) 
     { 
      if (FindScrollContentPresenter(VisualTreeHelper.GetChild(sv, i) as FrameworkElement) is FrameworkElement child && child is ScrollContentPresenter) 
      { 
       return child as ScrollContentPresenter; 
      } 
     } 

     return null; 
    } 

    public static readonly DependencyProperty AttachToControlProperty = 
     DependencyProperty.RegisterAttached("AttachToControl", typeof(FrameworkElement), typeof(StickyScrollHeader), new PropertyMetadata(null, (s, e) => 
     { 
      try 
      { 
       if (!(s is FrameworkElement targetControl)) 
       { return; } 

       Canvas.SetZIndex(targetControl, 999); 

       ScrollViewer sv; 
       FrameworkElement parent; 

       if (e.OldValue is FrameworkElement oldParentControl) 
       { 
        ScrollViewer oldSv = FindScrollViewer(oldParentControl); 
        parent = oldParentControl; 
        oldSv.ScrollChanged -= Sv_ScrollChanged; 
       } 

       if (e.NewValue is FrameworkElement newParentControl) 
       { 
        sv = FindScrollViewer(newParentControl); 
        parent = newParentControl; 
        sv.ScrollChanged += Sv_ScrollChanged; 
       } 

       void Sv_ScrollChanged(object sender, ScrollChangedEventArgs sce) 
       { 
        if (!parent.IsVisible) { return; } 

        try 
        { 

         ScrollViewer isv = sender as ScrollViewer; 
         ScrollContentPresenter scp = FindScrollContentPresenter(isv); 

         var relativeTransform = parent.TransformToAncestor(scp); 
         Rect parentRenderRect = relativeTransform.TransformBounds(new Rect(new Point(0, 0), parent.RenderSize)); 
         Rect intersectingRect = Rect.Intersect(new Rect(new Point(0, 0), scp.RenderSize), parentRenderRect); 
         if (intersectingRect != Rect.Empty) 
         { 
          TranslateTransform targetTransform = new TranslateTransform(); 

          if (parentRenderRect.Top < 0) 
          { 
           double tempTop = (parentRenderRect.Top * -1); 

           if (tempTop + targetControl.RenderSize.Height < parent.RenderSize.Height) 
           { 
            targetTransform.Y = tempTop; 
           } 
           else if (tempTop < parent.RenderSize.Height) 
           { 
            targetTransform.Y = tempTop - (targetControl.RenderSize.Height - intersectingRect.Height); 
           } 
          } 
          else 
          { 
           targetTransform.Y = 0; 
          } 
          targetControl.RenderTransform = targetTransform; 
         } 
        } 
        catch { } 
       } 
      } 
      catch { } 
     })); 
} 

Hoffe dies hilft auch anderen in dieses Problem zu laufen;)