public static class PixelBasedScrollingBehavior
{
public static bool GetIsEnabled (DependencyObject obj)
{
return (bool)obj.GetValue(IsEnabledProperty);
}
public static void SetIsEnabled (DependencyObject obj, bool value)
{
obj.SetValue(IsEnabledProperty, value);
}
public static readonly DependencyProperty IsEnabledProperty =
DependencyProperty.RegisterAttached("IsEnabled", typeof(bool), typeof(PixelBasedScrollingBehavior),
new UIPropertyMetadata(false, IsEnabledChanged));
private static void IsEnabledChanged (DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var isEnabled = (bool)e.NewValue;
if (d is VirtualizingPanel) {
if (TrySetScrollUnit(d, isEnabled))
return;
if (!TrySetIsPixelBased(d, isEnabled))
throw new InvalidOperationException("Failed to set IsPixelBased or ScrollUnit property.");
}
if (d is ItemsControl) {
TrySetScrollUnit(d, isEnabled);
}
}
private static bool TrySetScrollUnit (DependencyObject ctl, bool isEnabled)
{
// .NET 4.5: ctl.SetValue(VirtualizingPanel.ScrollUnitProperty, isEnabled ? ScrollUnit.Pixel : ScrollUnit.Item);
var propScrollUnit = typeof(VirtualizingPanel).GetField("ScrollUnitProperty", BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy);
if (propScrollUnit == null)
return false;
var dpScrollUnit = (DependencyProperty)propScrollUnit.GetValue(null);
var assemblyPresentationFramework = typeof(Window).Assembly;
var typeScrollUnit = assemblyPresentationFramework.GetType("System.Windows.Controls.ScrollUnit");
if (typeScrollUnit == null)
return false;
var valueScrollUnit = Enum.Parse(typeScrollUnit, isEnabled ? "Pixel" : "Item");
ctl.SetValue(dpScrollUnit, valueScrollUnit);
return true;
}
private static bool TrySetIsPixelBased (DependencyObject ctl, bool isEnabled)
{
// .NET 4.0: ctl.IsPixelBased = isEnabled;
var propIsPixelBased = ctl.GetType().GetProperty("IsPixelBased", BindingFlags.NonPublic | BindingFlags.Instance);
if (propIsPixelBased == null)
return false;
propIsPixelBased.SetValue(ctl, isEnabled, null);
return true;
}
}
そうでない場合は、アイテムモードで動作しますスクロール、ListBox
とVirtualizingStackPanel
にlocal:PixelBasedScrollingBehavior.IsEnabled="True"
の両方を設定する必要があります。このコードは.NET 4.0でコンパイルされます。 .NET 4.5がインストールされている場合は、新しいプロパティが使用されます。
の作業例:
MainWindow.xaml
<Window x:Class="So17371439ItemsLayoutBounty.MainWindow" x:Name="root"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:So17371439ItemsLayoutBounty"
Title="MainWindow">
<Window.Resources>
<Style x:Key="OrderRadioButton" TargetType="{x:Type RadioButton}"></Style>
<Style x:Key="OrderCheckboxButton" TargetType="{x:Type ToggleButton}"></Style>
<Style x:Key="OrderProductButton" TargetType="{x:Type Button}"></Style>
</Window.Resources>
<ListBox Name="items" ItemsSource="{Binding PreferenceGroups, ElementName=root}" HorizontalContentAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Disabled" local:PixelBasedScrollingBehavior.IsEnabled="True">
<ItemsControl.Resources>
<ItemsPanelTemplate x:Key="wrapPanel">
<WrapPanel/>
</ItemsPanelTemplate>
<DataTemplate x:Key="SoloSelection" DataType="local:PreferenceGroup">
<ItemsControl ItemsSource="{Binding Preferences}" ItemsPanel="{StaticResource wrapPanel}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<RadioButton Width="146" Height="58" Margin="0,0,4,4" GroupName="{Binding GroupId}" Style="{StaticResource OrderRadioButton}">
<TextBlock Margin="4,0,3,0" VerticalAlignment="Center" TextWrapping="Wrap" Text="{Binding Name}"/>
</RadioButton>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</DataTemplate>
<DataTemplate x:Key="MultiSelection" DataType="local:PreferenceGroup">
<ItemsControl ItemsSource="{Binding Preferences}" ItemsPanel="{StaticResource wrapPanel}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<ToggleButton Width="146" Height="58" Margin="0,0,4,4" Style="{StaticResource OrderCheckboxButton}">
<TextBlock Margin="4,0,3,0" VerticalAlignment="Center" TextWrapping="Wrap" Text="{Binding Name}"/>
</ToggleButton>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</DataTemplate>
<DataTemplate x:Key="MultiQuantitySelection" DataType="local:PreferenceGroup">
<ItemsControl ItemsSource="{Binding Preferences}" ItemsPanel="{StaticResource wrapPanel}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid Width="146" Height="58" Margin="0,0,4,4">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Button Name="quantity" Background="White" Width="45" Style="{StaticResource OrderProductButton}">
<TextBlock Text="{Binding Quantity}"/>
</Button>
<Button Margin="-1,0,0,0" Grid.Column="1" HorizontalAlignment="Stretch" HorizontalContentAlignment="Left" Style="{StaticResource OrderProductButton}">
<TextBlock TextWrapping="Wrap" HorizontalAlignment="Left" TextTrimming="CharacterEllipsis" Text="{Binding Name}"/>
</Button>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</DataTemplate>
</ItemsControl.Resources>
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock FontSize="25" FontWeight="Light" Margin="0,8,0,5" Text="{Binding Name}"/>
<ContentControl Content="{Binding}" Name="items"/>
</StackPanel>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding SelectionMode}" Value="1">
<Setter TargetName="items" Property="ContentTemplate" Value="{StaticResource SoloSelection}"/>
</DataTrigger>
<DataTrigger Binding="{Binding SelectionMode}" Value="2">
<Setter TargetName="items" Property="ContentTemplate" Value="{StaticResource MultiSelection}"/>
</DataTrigger>
<DataTrigger Binding="{Binding SelectionMode}" Value="3">
<Setter TargetName="items" Property="ContentTemplate" Value="{StaticResource MultiQuantitySelection}"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel x:Name="panel" Orientation="Vertical" VirtualizationMode="Recycling" local:PixelBasedScrollingBehavior.IsEnabled="True"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ListBox>
</Window>
MainWindow.xaml.cs
using System;
using System.Collections.ObjectModel;
using System.Reflection;
using System.Windows;
using System.Windows.Controls;
namespace So17371439ItemsLayoutBounty
{
public partial class MainWindow
{
public ObservableCollection<PreferenceGroup> PreferenceGroups { get; private set; }
public MainWindow()
{
var rnd = new Random();
PreferenceGroups = new ObservableCollection<PreferenceGroup>();
for (int i = 0; i < 100000; i++) {
var group = new PreferenceGroup { Name = string.Format("Group {0}", i), SelectionMode = rnd.Next(1, 4) };
int nprefs = rnd.Next(5, 40);
for (int j = 0; j < nprefs; j++)
group.Preferences.Add(new Preference { Name = string.Format("Pref {0}", j), Quantity = rnd.Next(100) });
PreferenceGroups.Add(group);
}
InitializeComponent();
}
}
public class PreferenceGroup
{
public string Name { get; set; }
public int SelectionMode { get; set; }
public ObservableCollection<Preference> Preferences { get; private set; }
public PreferenceGroup()
{
Preferences = new ObservableCollection<Preference>();
}
}
public class Preference
{
public string Name { get; set; }
public string GroupId { get; set; }
public int Quantity { get; set; }
}
public static class PixelBasedScrollingBehavior
{
public static bool GetIsEnabled (DependencyObject obj)
{
return (bool)obj.GetValue(IsEnabledProperty);
}
public static void SetIsEnabled (DependencyObject obj, bool value)
{
obj.SetValue(IsEnabledProperty, value);
}
public static readonly DependencyProperty IsEnabledProperty =
DependencyProperty.RegisterAttached("IsEnabled", typeof(bool), typeof(PixelBasedScrollingBehavior),
new UIPropertyMetadata(false, IsEnabledChanged));
private static void IsEnabledChanged (DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var isEnabled = (bool)e.NewValue;
if (d is VirtualizingPanel) {
if (TrySetScrollUnit(d, isEnabled))
return;
if (!TrySetIsPixelBased(d, isEnabled))
throw new InvalidOperationException("Failed to set IsPixelBased or ScrollUnit property.");
}
if (d is ItemsControl) {
TrySetScrollUnit(d, isEnabled);
}
}
private static bool TrySetScrollUnit (DependencyObject ctl, bool isEnabled)
{
// .NET 4.5: ctl.SetValue(VirtualizingPanel.ScrollUnitProperty, isEnabled ? ScrollUnit.Pixel : ScrollUnit.Item);
var propScrollUnit = typeof(VirtualizingPanel).GetField("ScrollUnitProperty", BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy);
if (propScrollUnit == null)
return false;
var dpScrollUnit = (DependencyProperty)propScrollUnit.GetValue(null);
var assemblyPresentationFramework = typeof(Window).Assembly;
var typeScrollUnit = assemblyPresentationFramework.GetType("System.Windows.Controls.ScrollUnit");
if (typeScrollUnit == null)
return false;
var valueScrollUnit = Enum.Parse(typeScrollUnit, isEnabled ? "Pixel" : "Item");
ctl.SetValue(dpScrollUnit, valueScrollUnit);
return true;
}
private static bool TrySetIsPixelBased (DependencyObject ctl, bool isEnabled)
{
// .NET 4.0: ctl.IsPixelBased = isEnabled;
var propIsPixelBased = ctl.GetType().GetProperty("IsPixelBased", BindingFlags.NonPublic | BindingFlags.Instance);
if (propIsPixelBased == null)
return false;
propIsPixelBased.SetValue(ctl, isEnabled, null);
return true;
}
}
}
あなたのコード内の添付プロパティの多くは、名前空間からあります。言及されていない。これは特に疑わしく見えます: '' Message.Attach = "[Event Checked] = [Action AddPreference($ dataContext、false)]; [Event Unchecked] = [Action RemovePreference($ datacontext、false)]' 'バインドするオブジェクトの性質と正確な数は決して言及しません。まったく、コードが多すぎます。 http://sscce.org/ を参照してください。なぜ仮想化がボトルネックだと思いますか?あなたのアプリケーションをプロファイリングしましたか? – Athari
これはcaliburn microのイベントです。実際にはリストにバインドするコードはありません。表示されるプロパティを使用します。アイテムは常にたくさんありません。 – GorillaApe
パフォーマンスを向上させる方法を尋ねる前に、コードをプロファイルする必要があります。 [c#profiler](https://www.google.com/search?q=c%23+profiler)を参照してください。 – Athari