diff --git a/src/Avalonia.Base/Utilities/MathUtilities.cs b/src/Avalonia.Base/Utilities/MathUtilities.cs index 41b57b6e70..027028480c 100644 --- a/src/Avalonia.Base/Utilities/MathUtilities.cs +++ b/src/Avalonia.Base/Utilities/MathUtilities.cs @@ -159,6 +159,11 @@ namespace Avalonia.Utilities /// The clamped value. public static int Clamp(int val, int min, int max) { + if (min > max) + { + throw new ArgumentException($"{min} cannot be greater than {max}."); + } + if (val < min) { return min; diff --git a/src/Avalonia.Controls/ItemsControl.cs b/src/Avalonia.Controls/ItemsControl.cs index b027da6d0c..bf22f0a08a 100644 --- a/src/Avalonia.Controls/ItemsControl.cs +++ b/src/Avalonia.Controls/ItemsControl.cs @@ -359,6 +359,12 @@ namespace Avalonia.Controls UpdateItemCount(); RemoveControlItemsFromLogicalChildren(oldValue); AddControlItemsToLogicalChildren(newValue); + + if (Presenter != null) + { + Presenter.Items = newValue; + } + SubscribeToItems(newValue); } @@ -370,6 +376,8 @@ namespace Avalonia.Controls /// The event args. protected virtual void ItemsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { + UpdateItemCount(); + switch (e.Action) { case NotifyCollectionChangedAction.Add: @@ -381,7 +389,7 @@ namespace Avalonia.Controls break; } - UpdateItemCount(); + Presenter?.ItemsChanged(e); var collection = sender as ICollection; PseudoClasses.Set(":empty", collection == null || collection.Count == 0); diff --git a/src/Avalonia.Controls/Presenters/IItemsPresenter.cs b/src/Avalonia.Controls/Presenters/IItemsPresenter.cs index 42311dc781..c4acf1ebef 100644 --- a/src/Avalonia.Controls/Presenters/IItemsPresenter.cs +++ b/src/Avalonia.Controls/Presenters/IItemsPresenter.cs @@ -1,12 +1,19 @@ // Copyright (c) The Avalonia Project. All rights reserved. // Licensed under the MIT license. See licence.md file in the project root for full license information. +using System.Collections; +using System.Collections.Specialized; + namespace Avalonia.Controls.Presenters { public interface IItemsPresenter : IPresenter { + IEnumerable Items { get; set; } + IPanel Panel { get; } + void ItemsChanged(NotifyCollectionChangedEventArgs e); + void ScrollIntoView(object item); } } diff --git a/src/Avalonia.Controls/Presenters/ItemsPresenterBase.cs b/src/Avalonia.Controls/Presenters/ItemsPresenterBase.cs index 0f0cdc37cf..ef1f277162 100644 --- a/src/Avalonia.Controls/Presenters/ItemsPresenterBase.cs +++ b/src/Avalonia.Controls/Presenters/ItemsPresenterBase.cs @@ -63,7 +63,7 @@ namespace Avalonia.Controls.Presenters _itemsSubscription?.Dispose(); _itemsSubscription = null; - if (_createdPanel && value is INotifyCollectionChanged incc) + if (!IsHosted && _createdPanel && value is INotifyCollectionChanged incc) { _itemsSubscription = incc.WeakSubscribe(ItemsCollectionChanged); } @@ -130,6 +130,8 @@ namespace Avalonia.Controls.Presenters private set; } + protected bool IsHosted => TemplatedParent is IItemsPresenterHost; + /// public override sealed void ApplyTemplate() { @@ -144,6 +146,15 @@ namespace Avalonia.Controls.Presenters { } + /// + void IItemsPresenter.ItemsChanged(NotifyCollectionChangedEventArgs e) + { + if (Panel != null) + { + ItemsChanged(e); + } + } + /// /// Creates the for the control. /// @@ -215,7 +226,7 @@ namespace Avalonia.Controls.Presenters _createdPanel = true; - if (_itemsSubscription == null && Items is INotifyCollectionChanged incc) + if (!IsHosted && _itemsSubscription == null && Items is INotifyCollectionChanged incc) { _itemsSubscription = incc.WeakSubscribe(ItemsCollectionChanged); } diff --git a/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs b/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs index 4b33b18475..b6ae567123 100644 --- a/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs +++ b/src/Avalonia.Controls/Primitives/SelectingItemsControl.cs @@ -302,13 +302,24 @@ namespace Avalonia.Controls.Primitives /// protected override void ItemsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { - base.ItemsCollectionChanged(sender, e); - if (_updateCount > 0) { + base.ItemsCollectionChanged(sender, e); return; } + switch (e.Action) + { + case NotifyCollectionChangedAction.Add: + _selection.ItemsInserted(e.NewStartingIndex, e.NewItems.Count); + break; + case NotifyCollectionChangedAction.Remove: + _selection.ItemsRemoved(e.OldStartingIndex, e.OldItems.Count); + break; + } + + base.ItemsCollectionChanged(sender, e); + switch (e.Action) { case NotifyCollectionChangedAction.Add: @@ -318,14 +329,12 @@ namespace Avalonia.Controls.Primitives } else { - _selection.ItemsInserted(e.NewStartingIndex, e.NewItems.Count); UpdateSelectedItem(_selection.First(), false); } break; case NotifyCollectionChangedAction.Remove: - _selection.ItemsRemoved(e.OldStartingIndex, e.OldItems.Count); UpdateSelectedItem(_selection.First(), false); ResetSelectedItems(); break; diff --git a/tests/Avalonia.Controls.UnitTests/ItemsControlTests.cs b/tests/Avalonia.Controls.UnitTests/ItemsControlTests.cs index b2839360ee..227d783874 100644 --- a/tests/Avalonia.Controls.UnitTests/ItemsControlTests.cs +++ b/tests/Avalonia.Controls.UnitTests/ItemsControlTests.cs @@ -12,6 +12,7 @@ using Xunit; using System.Collections.ObjectModel; using Avalonia.UnitTests; using Avalonia.Input; +using System.Collections.Generic; namespace Avalonia.Controls.UnitTests { @@ -104,6 +105,28 @@ namespace Avalonia.Controls.UnitTests Assert.Equal(new[] { child }, target.GetLogicalChildren()); } + [Fact] + public void Added_Container_Should_Have_LogicalParent_Set_To_ItemsControl() + { + var item = new Border(); + var items = new ObservableCollection(); + + var target = new ItemsControl + { + Template = GetTemplate(), + Items = items, + }; + + var root = new TestRoot(true, target); + + root.Measure(new Size(100, 100)); + root.Arrange(new Rect(0, 0, 100, 100)); + + items.Add(item); + + Assert.Equal(target, item.Parent); + } + [Fact] public void Control_Item_Should_Be_Removed_From_Logical_Children_Before_ApplyTemplate() { @@ -522,6 +545,36 @@ namespace Avalonia.Controls.UnitTests } } + [Fact] + public void Presenter_Items_Should_Be_In_Sync() + { + var target = new ItemsControl + { + Template = GetTemplate(), + Items = new object[] + { + new Button(), + new Button(), + }, + }; + + var root = new TestRoot { Child = target }; + var otherPanel = new StackPanel(); + + target.ApplyTemplate(); + target.Presenter.ApplyTemplate(); + + target.ItemContainerGenerator.Materialized += (s, e) => + { + Assert.IsType(e.Containers[0].Item); + }; + + target.Items = new[] + { + new Canvas() + }; + } + private class Item { public Item(string value) diff --git a/tests/Avalonia.Controls.UnitTests/Primitives/SelectingItemsControlTests.cs b/tests/Avalonia.Controls.UnitTests/Primitives/SelectingItemsControlTests.cs index ce333f66d6..6df89ba444 100644 --- a/tests/Avalonia.Controls.UnitTests/Primitives/SelectingItemsControlTests.cs +++ b/tests/Avalonia.Controls.UnitTests/Primitives/SelectingItemsControlTests.cs @@ -1,6 +1,7 @@ // Copyright (c) The Avalonia Project. All rights reserved. // Licensed under the MIT license. See licence.md file in the project root for full license information. +using System.Collections; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Collections.Specialized; @@ -14,6 +15,7 @@ using Avalonia.Data; using Avalonia.Input; using Avalonia.Interactivity; using Avalonia.Markup.Data; +using Avalonia.Styling; using Avalonia.UnitTests; using Moq; using Xunit; @@ -1104,6 +1106,45 @@ namespace Avalonia.Controls.UnitTests.Primitives Assert.True(raised); } + [Fact] + public void AutoScrollToSelectedItem_On_Reset_Works() + { + // Issue #3148 + using (UnitTestApplication.Start(TestServices.StyledWindow)) + { + var items = new ResettingCollection(100); + + var target = new ListBox + { + Items = items, + ItemTemplate = new FuncDataTemplate((x, _) => + new TextBlock + { + Text = x, + Width = 100, + Height = 10 + }), + AutoScrollToSelectedItem = true, + VirtualizationMode = ItemVirtualizationMode.Simple, + }; + + var root = new TestRoot(true, target); + root.Measure(new Size(100, 100)); + root.Arrange(new Rect(0, 0, 100, 100)); + + Assert.True(target.Presenter.Panel.Children.Count > 0); + Assert.True(target.Presenter.Panel.Children.Count < 100); + + target.SelectedItem = "Item99"; + + // #3148 triggered here. + items.Reset(new[] { "Item99" }); + + Assert.Equal(0, target.SelectedIndex); + Assert.Equal(1, target.Presenter.Panel.Children.Count); + } + } + [Fact] public void Can_Set_Both_SelectedItem_And_SelectedItems_During_Initialization() { @@ -1152,6 +1193,7 @@ namespace Avalonia.Controls.UnitTests.Primitives Name = "itemsPresenter", [~ItemsPresenter.ItemsProperty] = control[~ItemsControl.ItemsProperty], [~ItemsPresenter.ItemsPanelProperty] = control[~ItemsControl.ItemsPanelProperty], + [~ItemsPresenter.VirtualizationModeProperty] = control[~ListBox.VirtualizationModeProperty], }.RegisterInNameScope(scope)); } @@ -1196,5 +1238,24 @@ namespace Avalonia.Controls.UnitTests.Primitives return base.MoveSelection(direction, wrap); } } + + private class ResettingCollection : List, INotifyCollectionChanged + { + public ResettingCollection(int itemCount) + { + AddRange(Enumerable.Range(0, itemCount).Select(x => $"Item{x}")); + } + + public void Reset(IEnumerable items) + { + Clear(); + AddRange(items); + CollectionChanged?.Invoke( + this, + new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); + } + + public event NotifyCollectionChangedEventHandler CollectionChanged; + } } } diff --git a/tests/Avalonia.UnitTests/TestRoot.cs b/tests/Avalonia.UnitTests/TestRoot.cs index 969d7bc821..56d7f028f2 100644 --- a/tests/Avalonia.UnitTests/TestRoot.cs +++ b/tests/Avalonia.UnitTests/TestRoot.cs @@ -24,8 +24,19 @@ namespace Avalonia.UnitTests } public TestRoot(IControl child) + : this(false, child) + { + Child = child; + } + + public TestRoot(bool useGlobalStyles, IControl child) : this() { + if (useGlobalStyles) + { + StylingParent = UnitTestApplication.Current; + } + Child = child; }