Avalonia/tests/Avalonia.Visuals.UnitTests/Rendering/ImmediateRendererTests.cs

using System.Collections.Generic;
using Avalonia.Collections;
using Avalonia.Controls;
using Avalonia.Layout;
using Avalonia.Media;
using Avalonia.Platform;
using Avalonia.Rendering;
using Avalonia.UnitTests;
using Avalonia.VisualTree;
using Moq;
using Xunit;

namespace Avalonia.Visuals.UnitTests.Rendering
{
    public class ImmediateRendererTests
    {
        [Fact]
        public void AddDirty_Call_RenderRoot_Invalidate()
        {
            using (UnitTestApplication.Start(TestServices.MockPlatformRenderInterface))
            {
                var visual = new Mock<Visual>();
                var child = new Mock<Visual>() { CallBase = true };
                var renderRoot = visual.As<IRenderRoot>();

                visual.As<IVisual>().Setup(v => v.Bounds).Returns(new Rect(0, 0, 400, 400));

                child.As<IVisual>().Setup(v => v.Bounds).Returns(new Rect(10, 10, 100, 100));
                child.As<IVisual>().Setup(v => v.VisualParent).Returns(visual.Object);

                var target = new ImmediateRenderer(visual.Object);

                target.AddDirty(child.Object);

                renderRoot.Verify(v => v.Invalidate(new Rect(10, 10, 100, 100)));
            }
        }

        [Fact(Skip = "https://github.com/moq/moq4/issues/988")]
        public void AddDirty_With_RenderTransform_Call_RenderRoot_Invalidate()
        {
            using (UnitTestApplication.Start(TestServices.MockPlatformRenderInterface))
            {
                var visual = new Mock<Visual>();
                var child = new Mock<Visual>() { CallBase = true };
                var renderRoot = visual.As<IRenderRoot>();

                visual.As<IVisual>().Setup(v => v.Bounds).Returns(new Rect(0, 0, 400, 400));

                child.As<IVisual>().Setup(v => v.Bounds).Returns(new Rect(100, 100, 100, 100));
                child.As<IVisual>().Setup(v => v.VisualParent).Returns(visual.Object);
                child.Object.RenderTransform = new ScaleTransform() { ScaleX = 2, ScaleY = 2 };

                var target = new ImmediateRenderer(visual.Object);

                target.AddDirty(child.Object);

                renderRoot.Verify(v => v.Invalidate(new Rect(50, 50, 200, 200)));
            }
        }

        [Fact(Skip = "https://github.com/moq/moq4/issues/988")]
        public void AddDirty_For_Child_Moved_Should_Invalidate_Previous_Bounds()
        {
            using (UnitTestApplication.Start(TestServices.MockPlatformRenderInterface))
            {
                var visual = new Mock<Visual>() { CallBase = true };
                var child = new Mock<Visual>() { CallBase = true };
                var renderRoot = visual.As<IRenderRoot>();
                var renderTarget = visual.As<IRenderTarget>();

                renderRoot.Setup(r => r.CreateRenderTarget()).Returns(renderTarget.Object);

                renderTarget.Setup(r => r.CreateDrawingContext(It.IsAny<IVisualBrushRenderer>()))
                    .Returns(Mock.Of<IDrawingContextImpl>());

                visual.As<IVisual>().Setup(v => v.Bounds).Returns(new Rect(0, 0, 400, 400));

                visual.As<IVisual>().Setup(v => v.VisualChildren)
                    .Returns(new AvaloniaList<IVisual>() { child.As<IVisual>().Object });

                Rect childBounds = new Rect(0, 0, 100, 100);
                child.As<IVisual>().Setup(v => v.Bounds).Returns(() => childBounds);
                child.As<IVisual>().Setup(v => v.VisualParent).Returns(visual.Object);
                child.As<IVisual>().Setup(v => v.VisualChildren).Returns(new AvaloniaList<IVisual>());

                var invalidationCalls = new List<Rect>();

                renderRoot.Setup(v => v.Invalidate(It.IsAny<Rect>())).Callback<Rect>(v => invalidationCalls.Add(v));

                var target = new ImmediateRenderer(visual.Object);

                target.AddDirty(child.Object);

                Assert.Equal(new Rect(0, 0, 100, 100), invalidationCalls[0]);

                target.Paint(new Rect(0, 0, 100, 100));

                //move child 100 pixels bottom/right
                childBounds = new Rect(100, 100, 100, 100);

                //renderer should invalidate old child bounds with new one
                //as on old area there can be artifacts
                target.AddDirty(child.Object);

                //invalidate first old position
                Assert.Equal(new Rect(0, 0, 100, 100), invalidationCalls[1]);

                //then new position
                Assert.Equal(new Rect(100, 100, 100, 100), invalidationCalls[2]);
            }
        }

        [Fact(Skip = "https://github.com/moq/moq4/issues/988")]
        public void Should_Render_Child_In_Parent_With_RenderTransform()
        {
            using (UnitTestApplication.Start(TestServices.MockPlatformRenderInterface))
            {
                var targetMock = new Mock<Control>() { CallBase = true };
                var target = targetMock.Object;
                target.Width = 100;
                target.Height = 50;

                var child = new Panel()
                {
                    RenderTransform = new RotateTransform() { Angle = 90 },
                    Children = { new Panel() { Children = { target } } }
                };

                var visualTarget = targetMock.As<IVisual>();
                int rendered = 0;
                visualTarget.Setup(v => v.Render(It.IsAny<DrawingContext>())).Callback(() => rendered++);

                var root = new TestRoot(child);
                root.Renderer = new ImmediateRenderer(root);

                root.LayoutManager.ExecuteInitialLayoutPass();

                root.Measure(new Size(50, 100));
                root.Arrange(new Rect(new Size(50, 100)));

                root.Renderer.Paint(root.Bounds);

                Assert.Equal(1, rendered);
            }
        }

        [Fact(Skip = "https://github.com/moq/moq4/issues/988")]
        public void Should_Render_Child_In_Parent_With_RenderTransform2()
        {
            using (UnitTestApplication.Start(TestServices.MockPlatformRenderInterface))
            {
                var targetMock = new Mock<Control>() { CallBase = true };
                var target = targetMock.Object;

                target.Width = 100;
                target.Height = 50;
                target.HorizontalAlignment = HorizontalAlignment.Center;
                target.VerticalAlignment = VerticalAlignment.Center;

                var child = new Panel()
                {
                    RenderTransform = new RotateTransform() { Angle = 90 },
                    Children = { new Panel() { Children = { target } } }
                };

                var visualTarget = targetMock.As<IVisual>();
                int rendered = 0;
                visualTarget.Setup(v => v.Render(It.IsAny<DrawingContext>())).Callback(() => rendered++);

                var root = new TestRoot(child);
                root.Renderer = new ImmediateRenderer(root);

                root.LayoutManager.ExecuteInitialLayoutPass();

                root.Measure(new Size(300, 100));
                root.Arrange(new Rect(new Size(300, 100)));
                root.Renderer.Paint(root.Bounds);

                Assert.Equal(1, rendered);
            }
        }

        [Fact]
        public void Should_Not_Clip_Children_With_RenderTransform_When_In_Bounds()
        {
            using (UnitTestApplication.Start(TestServices.MockPlatformRenderInterface))
            {
                const int RootWidth = 300;
                const int RootHeight = 300;

                var rootGrid = new Grid { Width = RootWidth, Height = RootHeight, ClipToBounds = true };

                var stackPanel = new StackPanel
                {
                    Orientation = Orientation.Horizontal,
                    VerticalAlignment = VerticalAlignment.Top,
                    HorizontalAlignment = HorizontalAlignment.Right,
                    Margin = new Thickness(0, 10, 0, 0),
                    RenderTransformOrigin = new RelativePoint(new Point(0, 0), RelativeUnit.Relative),
                    RenderTransform = new TransformGroup
                    {
                        Children = { new RotateTransform { Angle = 90 }, new TranslateTransform { X = 240 } }
                    }
                };

                rootGrid.Children.Add(stackPanel);

                TestControl CreateControl()
                    => new TestControl
                    {
                        Width = 80, Height = 40, Margin = new Thickness(0, 0, 5, 0), ClipToBounds = true
                    };

                var control1 = CreateControl();
                var control2 = CreateControl();
                var control3 = CreateControl();

                stackPanel.Children.Add(control1);
                stackPanel.Children.Add(control2);
                stackPanel.Children.Add(control3);

                var root = new TestRoot(rootGrid);
                root.Renderer = new ImmediateRenderer(root);
                root.LayoutManager.ExecuteInitialLayoutPass();

                var rootSize = new Size(RootWidth, RootHeight);
                root.Measure(rootSize);
                root.Arrange(new Rect(rootSize));

                root.Renderer.Paint(root.Bounds);

                Assert.True(control1.Rendered);
                Assert.True(control2.Rendered);
                Assert.True(control3.Rendered);
            }
        }

        [Fact]
        public void Should_Not_Render_Clipped_Child_With_RenderTransform_When_Not_In_Bounds()
        {
            using (UnitTestApplication.Start(TestServices.MockPlatformRenderInterface))
            {
                const int RootWidth = 300;
                const int RootHeight = 300;

                var rootGrid = new Grid { Width = RootWidth, Height = RootHeight, ClipToBounds = true };

                var stackPanel = new StackPanel
                {
                    Orientation = Orientation.Horizontal,
                    VerticalAlignment = VerticalAlignment.Top,
                    HorizontalAlignment = HorizontalAlignment.Right,
                    Margin = new Thickness(0, 10, 0, 0),
                    RenderTransformOrigin = new RelativePoint(new Point(0, 0), RelativeUnit.Relative),
                    RenderTransform = new TransformGroup
                    {
                        Children = { new RotateTransform { Angle = 90 }, new TranslateTransform { X = 280 } }
                    }
                };

                rootGrid.Children.Add(stackPanel);

                TestControl CreateControl()
                    => new TestControl
                    {
                        Width = 160, Height = 40, Margin = new Thickness(0, 0, 5, 0), ClipToBounds = true
                    };

                var control1 = CreateControl();
                var control2 = CreateControl();
                var control3 = CreateControl();

                stackPanel.Children.Add(control1);
                stackPanel.Children.Add(control2);
                stackPanel.Children.Add(control3);

                var root = new TestRoot(rootGrid);
                root.Renderer = new ImmediateRenderer(root);
                root.LayoutManager.ExecuteInitialLayoutPass();

                var rootSize = new Size(RootWidth, RootHeight);
                root.Measure(rootSize);
                root.Arrange(new Rect(rootSize));

                root.Renderer.Paint(root.Bounds);

                Assert.True(control1.Rendered);
                Assert.True(control2.Rendered);
                Assert.False(control3.Rendered);
            }
        }

        private class TestControl : Control
        {
            public bool Rendered { get; private set; }

            public override void Render(DrawingContext context)
                => Rendered = true;
        }
    }
}