Steven Kirk
10 years ago
3 changed files with 280 additions and 198 deletions
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// Copyright (c) The Avalonia Project. All rights reserved.
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// Licensed under the MIT license. See licence.md file in the project root for full license information.
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using System.Collections.Generic; |
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using System.Linq; |
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using Avalonia.Controls.Generators; |
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using Avalonia.Controls.Presenters; |
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using Avalonia.Controls.Primitives; |
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using Avalonia.Controls.Templates; |
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using Xunit; |
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namespace Avalonia.Controls.UnitTests.Presenters |
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{ |
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public class ItemsPresenterTests_Virtualization_Simple |
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{ |
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[Fact] |
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public void Should_Return_Items_Count_For_Extent_Vertical() |
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{ |
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var target = CreateTarget(); |
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target.ApplyTemplate(); |
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Assert.Equal(new Size(0, 20), ((ILogicalScrollable)target).Extent); |
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} |
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[Fact] |
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public void Should_Return_Items_Count_For_Extent_Horizontal() |
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{ |
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var target = CreateTarget(orientation: Orientation.Horizontal); |
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target.ApplyTemplate(); |
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Assert.Equal(new Size(20, 0), ((ILogicalScrollable)target).Extent); |
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} |
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[Fact] |
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public void Should_Have_Number_Of_Visible_Items_As_Viewport_Vertical() |
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{ |
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var target = CreateTarget(); |
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target.ApplyTemplate(); |
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target.Measure(new Size(100, 100)); |
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target.Arrange(new Rect(0, 0, 100, 100)); |
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Assert.Equal(new Size(0, 10), ((ILogicalScrollable)target).Viewport); |
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} |
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[Fact] |
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public void Should_Have_Number_Of_Visible_Items_As_Viewport_Horizontal() |
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{ |
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var target = CreateTarget(orientation: Orientation.Horizontal); |
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target.ApplyTemplate(); |
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target.Measure(new Size(100, 100)); |
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target.Arrange(new Rect(0, 0, 100, 100)); |
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Assert.Equal(new Size(10, 0), ((ILogicalScrollable)target).Viewport); |
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} |
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[Fact] |
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public void Should_Remove_Items_When_Control_Is_Shrank() |
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{ |
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var target = CreateTarget(); |
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var items = (IList<string>)target.Items; |
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target.ApplyTemplate(); |
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target.Measure(new Size(100, 100)); |
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target.Arrange(new Rect(0, 0, 100, 100)); |
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Assert.Equal(10, target.Panel.Children.Count); |
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target.Arrange(new Rect(0, 0, 100, 80)); |
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Assert.Equal(8, target.Panel.Children.Count); |
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} |
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[Fact] |
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public void Should_Update_Containers_When_Items_Changes() |
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{ |
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var target = CreateTarget(); |
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target.ApplyTemplate(); |
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target.Measure(new Size(100, 100)); |
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target.Arrange(new Rect(0, 0, 100, 100)); |
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target.Items = new[] { "foo", "bar", "baz" }; |
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Assert.Equal(3, target.Panel.Children.Count); |
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} |
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[Fact] |
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public void Should_Decrease_The_Viewport_Size_By_One_If_There_Is_A_Partial_Item() |
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{ |
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var target = CreateTarget(); |
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target.ApplyTemplate(); |
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target.Measure(new Size(100, 95)); |
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target.Arrange(new Rect(0, 0, 100, 95)); |
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Assert.Equal(new Size(0, 9), ((ILogicalScrollable)target).Viewport); |
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} |
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[Fact] |
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public void Moving_To_And_From_The_End_With_Partial_Item_Should_Set_Panel_PixelOffset() |
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{ |
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var target = CreateTarget(itemCount: 20); |
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target.ApplyTemplate(); |
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target.Measure(new Size(100, 95)); |
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target.Arrange(new Rect(0, 0, 100, 95)); |
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((ILogicalScrollable)target).Offset = new Vector(0, 11); |
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var minIndex = target.ItemContainerGenerator.Containers.Min(x => x.Index); |
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Assert.Equal(new Vector(0, 11), ((ILogicalScrollable)target).Offset); |
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Assert.Equal(10, minIndex); |
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Assert.Equal(5, ((IVirtualizingPanel)target.Panel).PixelOffset); |
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((ILogicalScrollable)target).Offset = new Vector(0, 10); |
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minIndex = target.ItemContainerGenerator.Containers.Min(x => x.Index); |
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Assert.Equal(new Vector(0, 10), ((ILogicalScrollable)target).Offset); |
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Assert.Equal(10, minIndex); |
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Assert.Equal(0, ((IVirtualizingPanel)target.Panel).PixelOffset); |
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((ILogicalScrollable)target).Offset = new Vector(0, 11); |
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minIndex = target.ItemContainerGenerator.Containers.Min(x => x.Index); |
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Assert.Equal(new Vector(0, 11), ((ILogicalScrollable)target).Offset); |
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Assert.Equal(10, minIndex); |
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Assert.Equal(5, ((IVirtualizingPanel)target.Panel).PixelOffset); |
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} |
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public class WithContainers |
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{ |
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[Fact] |
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public void Scrolling_Less_Than_A_Page_Should_Move_Recycled_Items() |
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{ |
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var target = CreateTarget(); |
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var items = (IList<string>)target.Items; |
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target.ApplyTemplate(); |
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target.Measure(new Size(100, 100)); |
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target.Arrange(new Rect(0, 0, 100, 100)); |
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var containers = target.Panel.Children.ToList(); |
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var scroller = (ScrollContentPresenter)target.Parent; |
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scroller.Offset = new Vector(0, 5); |
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var scrolledContainers = containers |
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.Skip(5) |
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.Take(5) |
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.Concat(containers.Take(5)).ToList(); |
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Assert.Equal(new Vector(0, 5), ((ILogicalScrollable)target).Offset); |
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Assert.Equal(scrolledContainers, target.Panel.Children); |
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for (var i = 0; i < target.Panel.Children.Count; ++i) |
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{ |
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Assert.Equal(items[i + 5], target.Panel.Children[i].DataContext); |
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} |
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scroller.Offset = new Vector(0, 0); |
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Assert.Equal(new Vector(0, 0), ((ILogicalScrollable)target).Offset); |
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Assert.Equal(containers, target.Panel.Children); |
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var dcs = target.Panel.Children.Select(x => x.DataContext).ToList(); |
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for (var i = 0; i < target.Panel.Children.Count; ++i) |
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{ |
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Assert.Equal(items[i], target.Panel.Children[i].DataContext); |
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} |
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} |
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[Fact] |
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public void Scrolling_More_Than_A_Page_Should_Recycle_Items() |
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{ |
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var target = CreateTarget(itemCount: 50); |
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var items = (IList<string>)target.Items; |
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target.ApplyTemplate(); |
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target.Measure(new Size(100, 100)); |
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target.Arrange(new Rect(0, 0, 100, 100)); |
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var containers = target.Panel.Children.ToList(); |
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var scroller = (ScrollContentPresenter)target.Parent; |
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scroller.Offset = new Vector(0, 20); |
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Assert.Equal(new Vector(0, 20), ((ILogicalScrollable)target).Offset); |
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Assert.Equal(containers, target.Panel.Children); |
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for (var i = 0; i < target.Panel.Children.Count; ++i) |
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{ |
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Assert.Equal(items[i + 20], target.Panel.Children[i].DataContext); |
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} |
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scroller.Offset = new Vector(0, 0); |
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Assert.Equal(new Vector(0, 0), ((ILogicalScrollable)target).Offset); |
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Assert.Equal(containers, target.Panel.Children); |
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for (var i = 0; i < target.Panel.Children.Count; ++i) |
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{ |
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Assert.Equal(items[i], target.Panel.Children[i].DataContext); |
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} |
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} |
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} |
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private static ItemsPresenter CreateTarget( |
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Orientation orientation = Orientation.Vertical, |
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bool useContainers = true, |
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int itemCount = 20) |
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{ |
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ItemsPresenter result; |
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var items = Enumerable.Range(0, itemCount).Select(x => $"Item {x}").ToList(); |
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var scroller = new ScrollContentPresenter |
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{ |
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Content = result = new TestItemsPresenter(useContainers) |
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{ |
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Items = items, |
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ItemsPanel = VirtualizingPanelTemplate(orientation), |
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ItemTemplate = ItemTemplate(), |
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VirtualizationMode = ItemVirtualizationMode.Simple, |
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} |
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}; |
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scroller.UpdateChild(); |
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return result; |
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} |
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private static IDataTemplate ItemTemplate() |
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{ |
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return new FuncDataTemplate<string>(x => new Canvas |
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{ |
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Width = 10, |
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Height = 10, |
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}); |
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} |
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private static ITemplate<IPanel> VirtualizingPanelTemplate( |
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Orientation orientation = Orientation.Vertical) |
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{ |
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return new FuncTemplate<IPanel>(() => new VirtualizingStackPanel |
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{ |
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Orientation = orientation, |
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}); |
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} |
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private class TestItemsPresenter : ItemsPresenter |
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{ |
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private bool _useContainers; |
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public TestItemsPresenter(bool useContainers) |
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{ |
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_useContainers = useContainers; |
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} |
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protected override IItemContainerGenerator CreateItemContainerGenerator() |
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{ |
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return _useContainers ? |
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new ItemContainerGenerator<TestContainer>(this, TestContainer.ContentProperty, null) : |
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new ItemContainerGenerator(this); |
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} |
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} |
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private class TestContainer : ContentControl |
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{ |
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public TestContainer() |
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{ |
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Width = 10; |
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Height = 10; |
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} |
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} |
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} |
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} |
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