|
|
@@ -0,0 +1,279 @@
|
|
|
+// 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.Generic;
|
|
|
+using System.Linq;
|
|
|
+using Avalonia.Controls.Generators;
|
|
|
+using Avalonia.Controls.Presenters;
|
|
|
+using Avalonia.Controls.Primitives;
|
|
|
+using Avalonia.Controls.Templates;
|
|
|
+using Xunit;
|
|
|
+
|
|
|
+namespace Avalonia.Controls.UnitTests.Presenters
|
|
|
+{
|
|
|
+ public class ItemsPresenterTests_Virtualization_Simple
|
|
|
+ {
|
|
|
+ [Fact]
|
|
|
+ public void Should_Return_Items_Count_For_Extent_Vertical()
|
|
|
+ {
|
|
|
+ var target = CreateTarget();
|
|
|
+
|
|
|
+ target.ApplyTemplate();
|
|
|
+
|
|
|
+ Assert.Equal(new Size(0, 20), ((ILogicalScrollable)target).Extent);
|
|
|
+ }
|
|
|
+
|
|
|
+ [Fact]
|
|
|
+ public void Should_Return_Items_Count_For_Extent_Horizontal()
|
|
|
+ {
|
|
|
+ var target = CreateTarget(orientation: Orientation.Horizontal);
|
|
|
+
|
|
|
+ target.ApplyTemplate();
|
|
|
+
|
|
|
+ Assert.Equal(new Size(20, 0), ((ILogicalScrollable)target).Extent);
|
|
|
+ }
|
|
|
+
|
|
|
+ [Fact]
|
|
|
+ public void Should_Have_Number_Of_Visible_Items_As_Viewport_Vertical()
|
|
|
+ {
|
|
|
+ var target = CreateTarget();
|
|
|
+
|
|
|
+ target.ApplyTemplate();
|
|
|
+ target.Measure(new Size(100, 100));
|
|
|
+ target.Arrange(new Rect(0, 0, 100, 100));
|
|
|
+
|
|
|
+ Assert.Equal(new Size(0, 10), ((ILogicalScrollable)target).Viewport);
|
|
|
+ }
|
|
|
+
|
|
|
+ [Fact]
|
|
|
+ public void Should_Have_Number_Of_Visible_Items_As_Viewport_Horizontal()
|
|
|
+ {
|
|
|
+ var target = CreateTarget(orientation: Orientation.Horizontal);
|
|
|
+
|
|
|
+ target.ApplyTemplate();
|
|
|
+ target.Measure(new Size(100, 100));
|
|
|
+ target.Arrange(new Rect(0, 0, 100, 100));
|
|
|
+
|
|
|
+ Assert.Equal(new Size(10, 0), ((ILogicalScrollable)target).Viewport);
|
|
|
+ }
|
|
|
+
|
|
|
+ [Fact]
|
|
|
+ public void Should_Remove_Items_When_Control_Is_Shrank()
|
|
|
+ {
|
|
|
+ var target = CreateTarget();
|
|
|
+ var items = (IList<string>)target.Items;
|
|
|
+
|
|
|
+ target.ApplyTemplate();
|
|
|
+ target.Measure(new Size(100, 100));
|
|
|
+ target.Arrange(new Rect(0, 0, 100, 100));
|
|
|
+
|
|
|
+ Assert.Equal(10, target.Panel.Children.Count);
|
|
|
+
|
|
|
+ target.Arrange(new Rect(0, 0, 100, 80));
|
|
|
+
|
|
|
+ Assert.Equal(8, target.Panel.Children.Count);
|
|
|
+ }
|
|
|
+
|
|
|
+ [Fact]
|
|
|
+ public void Should_Update_Containers_When_Items_Changes()
|
|
|
+ {
|
|
|
+ var target = CreateTarget();
|
|
|
+
|
|
|
+ target.ApplyTemplate();
|
|
|
+ target.Measure(new Size(100, 100));
|
|
|
+ target.Arrange(new Rect(0, 0, 100, 100));
|
|
|
+
|
|
|
+ target.Items = new[] { "foo", "bar", "baz" };
|
|
|
+
|
|
|
+ Assert.Equal(3, target.Panel.Children.Count);
|
|
|
+ }
|
|
|
+
|
|
|
+ [Fact]
|
|
|
+ public void Should_Decrease_The_Viewport_Size_By_One_If_There_Is_A_Partial_Item()
|
|
|
+ {
|
|
|
+ var target = CreateTarget();
|
|
|
+
|
|
|
+ target.ApplyTemplate();
|
|
|
+ target.Measure(new Size(100, 95));
|
|
|
+ target.Arrange(new Rect(0, 0, 100, 95));
|
|
|
+
|
|
|
+ Assert.Equal(new Size(0, 9), ((ILogicalScrollable)target).Viewport);
|
|
|
+ }
|
|
|
+
|
|
|
+ [Fact]
|
|
|
+ public void Moving_To_And_From_The_End_With_Partial_Item_Should_Set_Panel_PixelOffset()
|
|
|
+ {
|
|
|
+ var target = CreateTarget(itemCount: 20);
|
|
|
+
|
|
|
+ target.ApplyTemplate();
|
|
|
+ target.Measure(new Size(100, 95));
|
|
|
+ target.Arrange(new Rect(0, 0, 100, 95));
|
|
|
+
|
|
|
+ ((ILogicalScrollable)target).Offset = new Vector(0, 11);
|
|
|
+
|
|
|
+ var minIndex = target.ItemContainerGenerator.Containers.Min(x => x.Index);
|
|
|
+ Assert.Equal(new Vector(0, 11), ((ILogicalScrollable)target).Offset);
|
|
|
+ Assert.Equal(10, minIndex);
|
|
|
+ Assert.Equal(5, ((IVirtualizingPanel)target.Panel).PixelOffset);
|
|
|
+
|
|
|
+ ((ILogicalScrollable)target).Offset = new Vector(0, 10);
|
|
|
+
|
|
|
+ minIndex = target.ItemContainerGenerator.Containers.Min(x => x.Index);
|
|
|
+ Assert.Equal(new Vector(0, 10), ((ILogicalScrollable)target).Offset);
|
|
|
+ Assert.Equal(10, minIndex);
|
|
|
+ Assert.Equal(0, ((IVirtualizingPanel)target.Panel).PixelOffset);
|
|
|
+
|
|
|
+ ((ILogicalScrollable)target).Offset = new Vector(0, 11);
|
|
|
+
|
|
|
+ minIndex = target.ItemContainerGenerator.Containers.Min(x => x.Index);
|
|
|
+ Assert.Equal(new Vector(0, 11), ((ILogicalScrollable)target).Offset);
|
|
|
+ Assert.Equal(10, minIndex);
|
|
|
+ Assert.Equal(5, ((IVirtualizingPanel)target.Panel).PixelOffset);
|
|
|
+ }
|
|
|
+
|
|
|
+ public class WithContainers
|
|
|
+ {
|
|
|
+ [Fact]
|
|
|
+ public void Scrolling_Less_Than_A_Page_Should_Move_Recycled_Items()
|
|
|
+ {
|
|
|
+ var target = CreateTarget();
|
|
|
+ var items = (IList<string>)target.Items;
|
|
|
+
|
|
|
+ target.ApplyTemplate();
|
|
|
+ target.Measure(new Size(100, 100));
|
|
|
+ target.Arrange(new Rect(0, 0, 100, 100));
|
|
|
+
|
|
|
+ var containers = target.Panel.Children.ToList();
|
|
|
+ var scroller = (ScrollContentPresenter)target.Parent;
|
|
|
+
|
|
|
+ scroller.Offset = new Vector(0, 5);
|
|
|
+
|
|
|
+ var scrolledContainers = containers
|
|
|
+ .Skip(5)
|
|
|
+ .Take(5)
|
|
|
+ .Concat(containers.Take(5)).ToList();
|
|
|
+
|
|
|
+ Assert.Equal(new Vector(0, 5), ((ILogicalScrollable)target).Offset);
|
|
|
+ Assert.Equal(scrolledContainers, target.Panel.Children);
|
|
|
+
|
|
|
+ for (var i = 0; i < target.Panel.Children.Count; ++i)
|
|
|
+ {
|
|
|
+ Assert.Equal(items[i + 5], target.Panel.Children[i].DataContext);
|
|
|
+ }
|
|
|
+
|
|
|
+ scroller.Offset = new Vector(0, 0);
|
|
|
+ Assert.Equal(new Vector(0, 0), ((ILogicalScrollable)target).Offset);
|
|
|
+ Assert.Equal(containers, target.Panel.Children);
|
|
|
+
|
|
|
+ var dcs = target.Panel.Children.Select(x => x.DataContext).ToList();
|
|
|
+
|
|
|
+ for (var i = 0; i < target.Panel.Children.Count; ++i)
|
|
|
+ {
|
|
|
+ Assert.Equal(items[i], target.Panel.Children[i].DataContext);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ [Fact]
|
|
|
+ public void Scrolling_More_Than_A_Page_Should_Recycle_Items()
|
|
|
+ {
|
|
|
+ var target = CreateTarget(itemCount: 50);
|
|
|
+ var items = (IList<string>)target.Items;
|
|
|
+
|
|
|
+ target.ApplyTemplate();
|
|
|
+ target.Measure(new Size(100, 100));
|
|
|
+ target.Arrange(new Rect(0, 0, 100, 100));
|
|
|
+
|
|
|
+ var containers = target.Panel.Children.ToList();
|
|
|
+ var scroller = (ScrollContentPresenter)target.Parent;
|
|
|
+
|
|
|
+ scroller.Offset = new Vector(0, 20);
|
|
|
+
|
|
|
+ Assert.Equal(new Vector(0, 20), ((ILogicalScrollable)target).Offset);
|
|
|
+ Assert.Equal(containers, target.Panel.Children);
|
|
|
+
|
|
|
+ for (var i = 0; i < target.Panel.Children.Count; ++i)
|
|
|
+ {
|
|
|
+ Assert.Equal(items[i + 20], target.Panel.Children[i].DataContext);
|
|
|
+ }
|
|
|
+
|
|
|
+ scroller.Offset = new Vector(0, 0);
|
|
|
+
|
|
|
+ Assert.Equal(new Vector(0, 0), ((ILogicalScrollable)target).Offset);
|
|
|
+ Assert.Equal(containers, target.Panel.Children);
|
|
|
+
|
|
|
+ for (var i = 0; i < target.Panel.Children.Count; ++i)
|
|
|
+ {
|
|
|
+ Assert.Equal(items[i], target.Panel.Children[i].DataContext);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ private static ItemsPresenter CreateTarget(
|
|
|
+ Orientation orientation = Orientation.Vertical,
|
|
|
+ bool useContainers = true,
|
|
|
+ int itemCount = 20)
|
|
|
+ {
|
|
|
+ ItemsPresenter result;
|
|
|
+ var items = Enumerable.Range(0, itemCount).Select(x => $"Item {x}").ToList();
|
|
|
+
|
|
|
+ var scroller = new ScrollContentPresenter
|
|
|
+ {
|
|
|
+ Content = result = new TestItemsPresenter(useContainers)
|
|
|
+ {
|
|
|
+ Items = items,
|
|
|
+ ItemsPanel = VirtualizingPanelTemplate(orientation),
|
|
|
+ ItemTemplate = ItemTemplate(),
|
|
|
+ VirtualizationMode = ItemVirtualizationMode.Simple,
|
|
|
+ }
|
|
|
+ };
|
|
|
+
|
|
|
+ scroller.UpdateChild();
|
|
|
+
|
|
|
+ return result;
|
|
|
+ }
|
|
|
+
|
|
|
+ private static IDataTemplate ItemTemplate()
|
|
|
+ {
|
|
|
+ return new FuncDataTemplate<string>(x => new Canvas
|
|
|
+ {
|
|
|
+ Width = 10,
|
|
|
+ Height = 10,
|
|
|
+ });
|
|
|
+ }
|
|
|
+
|
|
|
+ private static ITemplate<IPanel> VirtualizingPanelTemplate(
|
|
|
+ Orientation orientation = Orientation.Vertical)
|
|
|
+ {
|
|
|
+ return new FuncTemplate<IPanel>(() => new VirtualizingStackPanel
|
|
|
+ {
|
|
|
+ Orientation = orientation,
|
|
|
+ });
|
|
|
+ }
|
|
|
+
|
|
|
+ private class TestItemsPresenter : ItemsPresenter
|
|
|
+ {
|
|
|
+ private bool _useContainers;
|
|
|
+
|
|
|
+ public TestItemsPresenter(bool useContainers)
|
|
|
+ {
|
|
|
+ _useContainers = useContainers;
|
|
|
+ }
|
|
|
+
|
|
|
+ protected override IItemContainerGenerator CreateItemContainerGenerator()
|
|
|
+ {
|
|
|
+ return _useContainers ?
|
|
|
+ new ItemContainerGenerator<TestContainer>(this, TestContainer.ContentProperty, null) :
|
|
|
+ new ItemContainerGenerator(this);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ private class TestContainer : ContentControl
|
|
|
+ {
|
|
|
+ public TestContainer()
|
|
|
+ {
|
|
|
+ Width = 10;
|
|
|
+ Height = 10;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
Steven Kirk