Steven Kirk
3 years ago
7 changed files with 229 additions and 5 deletions
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using MiniMvvm; |
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namespace VirtualizationDemo.ViewModels; |
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public class PlaygroundItemViewModel : ViewModelBase |
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{ |
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private string? _header; |
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public PlaygroundItemViewModel(int index) => Header = $"Item {index}"; |
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public PlaygroundItemViewModel(string? header) => Header = header; |
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public string? Header |
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{ |
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get => _header; |
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set => RaiseAndSetIfChanged(ref _header, value); |
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} |
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} |
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@ -0,0 +1,95 @@ |
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using System; |
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using System.Collections.ObjectModel; |
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using System.Linq; |
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using Avalonia; |
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using Avalonia.Controls; |
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using Avalonia.Controls.Selection; |
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using MiniMvvm; |
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namespace VirtualizationDemo.ViewModels; |
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public class PlaygroundPageViewModel : ViewModelBase |
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{ |
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private SelectionMode _selectionMode = SelectionMode.Multiple; |
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private int _scrollToIndex = 500; |
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private string? _newItemHeader = "New Item 1"; |
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public PlaygroundPageViewModel() |
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{ |
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Items = new(Enumerable.Range(0, 1000).Select(x => new PlaygroundItemViewModel(x))); |
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Selection = new(); |
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} |
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public ObservableCollection<PlaygroundItemViewModel> Items { get; } |
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public bool Multiple |
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{ |
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get => _selectionMode.HasAnyFlag(SelectionMode.Multiple); |
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set => SetSelectionMode(SelectionMode.Multiple, value); |
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} |
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public bool Toggle |
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{ |
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get => _selectionMode.HasAnyFlag(SelectionMode.Toggle); |
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set => SetSelectionMode(SelectionMode.Toggle, value); |
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} |
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public bool AlwaysSelected |
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{ |
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get => _selectionMode.HasAnyFlag(SelectionMode.AlwaysSelected); |
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set => SetSelectionMode(SelectionMode.AlwaysSelected, value); |
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} |
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public SelectionModel<PlaygroundItemViewModel> Selection { get; } |
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public SelectionMode SelectionMode |
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{ |
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get => _selectionMode; |
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set => RaiseAndSetIfChanged(ref _selectionMode, value); |
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} |
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public int ScrollToIndex |
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{ |
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get => _scrollToIndex; |
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set => RaiseAndSetIfChanged(ref _scrollToIndex, value); |
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} |
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public string? NewItemHeader |
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{ |
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get => _newItemHeader; |
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set => RaiseAndSetIfChanged(ref _newItemHeader, value); |
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} |
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public void ExecuteScrollToIndex() |
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{ |
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Selection.Select(ScrollToIndex); |
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} |
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public void RandomizeScrollToIndex() |
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{ |
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var rnd = new Random(); |
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ScrollToIndex = rnd.Next(Items.Count); |
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} |
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public void AddAtSelectedIndex() |
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{ |
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if (Selection.SelectedIndex == -1) |
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return; |
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Items.Insert(Selection.SelectedIndex, new(NewItemHeader)); |
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} |
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public void DeleteSelectedItem() |
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{ |
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var count = Selection.Count; |
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for (var i = count - 1; i >= 0; i--) |
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Items.RemoveAt(Selection.SelectedIndexes[i]); |
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} |
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private void SetSelectionMode(SelectionMode mode, bool value) |
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{ |
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if (value) |
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SelectionMode |= mode; |
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else |
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SelectionMode &= ~mode; |
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} |
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} |
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@ -0,0 +1,66 @@ |
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<UserControl xmlns="https://github.com/avaloniaui" |
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" |
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008" |
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" |
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xmlns:vm="using:VirtualizationDemo.ViewModels" |
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mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450" |
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x:Class="VirtualizationDemo.Views.PlaygroundPageView" |
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x:DataType="vm:PlaygroundPageViewModel"> |
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<DockPanel> |
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<StackPanel DockPanel.Dock="Right" Margin="8 0" Width="200"> |
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<DropDownButton Content="Selection" HorizontalAlignment="Stretch"> |
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<Button.Flyout> |
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<Flyout> |
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<StackPanel> |
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<CheckBox IsChecked="{Binding Multiple}">Multiple</CheckBox> |
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<CheckBox IsChecked="{Binding Toggle}">Toggle</CheckBox> |
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<CheckBox IsChecked="{Binding AlwaysSelected}">AlwaysSelected</CheckBox> |
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<CheckBox IsChecked="{Binding #list.AutoScrollToSelectedItem}">AutoScrollToSelectedItem</CheckBox> |
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<CheckBox IsChecked="{Binding #list.WrapSelection}">WrapSelection</CheckBox> |
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</StackPanel> |
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</Flyout> |
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</Button.Flyout> |
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</DropDownButton> |
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<Label>_Select Item</Label> |
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<DockPanel> |
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<TextBox x:Name="scrollToIndex" Text="{Binding ScrollToIndex}"> |
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<TextBox.InnerRightContent> |
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<StackPanel Orientation="Horizontal"> |
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<Button DockPanel.Dock="Right" |
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Command="{Binding RandomizeScrollToIndex}" |
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ToolTip.Tip="Randomize"> |
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⟳ |
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</Button> |
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<Button DockPanel.Dock="Right" |
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Command="{Binding ExecuteScrollToIndex}" |
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ToolTip.Tip="Execute"> |
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⮐ |
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</Button> |
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</StackPanel> |
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</TextBox.InnerRightContent> |
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</TextBox> |
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</DockPanel> |
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<Label>New Item</Label> |
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<TextBox Text="{Binding NewItemHeader}"> |
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<TextBox.InnerRightContent> |
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<Button Command="{Binding AddAtSelectedIndex}" |
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ToolTip.Tip="Add at Selected Index">+</Button> |
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</TextBox.InnerRightContent> |
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</TextBox> |
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<Button Command="{Binding DeleteSelectedItem}" Margin="0 8 0 0"> |
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Delete Selected |
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</Button> |
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</StackPanel> |
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<TextBlock Name="itemCount" DockPanel.Dock="Bottom"/> |
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<ListBox Name="list" |
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ItemsSource="{Binding Items}" |
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DisplayMemberBinding="{Binding Header}" |
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Selection="{Binding Selection}" |
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SelectionMode="{Binding SelectionMode}"/> |
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</DockPanel> |
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</UserControl> |
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@ -0,0 +1,44 @@ |
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using System; |
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using System.Linq; |
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using System.Threading; |
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using Avalonia; |
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using Avalonia.Controls; |
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using Avalonia.Markup.Xaml; |
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using Avalonia.Threading; |
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namespace VirtualizationDemo.Views; |
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public partial class PlaygroundPageView : UserControl |
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{ |
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private DispatcherTimer _timer; |
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public PlaygroundPageView() |
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{ |
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InitializeComponent(); |
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_timer = new DispatcherTimer |
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{ |
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Interval = TimeSpan.FromMilliseconds(500), |
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}; |
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_timer.Tick += TimerTick; |
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} |
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protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e) |
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{ |
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base.OnAttachedToVisualTree(e); |
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_timer.Start(); |
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} |
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protected override void OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs e) |
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{ |
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base.OnDetachedFromVisualTree(e); |
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_timer.Stop(); |
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} |
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private void TimerTick(object? sender, EventArgs e) |
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{ |
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var message = $"Realized {list.GetRealizedContainers().Count()} of {list.ItemsPanelRoot?.Children.Count}"; |
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itemCount.Text = message; |
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} |
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} |
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