Added Application.Mouse tests

UnitTests/Application/Mouse/MouseEnterLeaveTests.cs

@@ -0,0 +1,337 @@
+namespace Terminal.Gui.ViewMouseTests;
+
+[Trait ("Category", "Input")]
+public class ApplicationMouseEnterLeaveTests
+{
+    private class TestView : View
+    {
+        public TestView ()
+        {
+            X = 1;
+            Y = 1;
+            Width = 1;
+            Height = 1;
+        }
+
+        public bool HandleOnEnter { get; }
+        public bool HandleOnLeave { get; }
+
+        public int OnMouseEnterCalled { get; private set; }
+        public int OnMouseLeaveCalled { get; private set; }
+
+        protected internal override bool? OnMouseEnter (MouseEvent mouseEvent)
+        {
+            OnMouseEnterCalled++;
+            mouseEvent.Handled = HandleOnEnter;
+
+            base.OnMouseEnter (mouseEvent);
+
+            return mouseEvent.Handled;
+        }
+
+        protected internal override bool OnMouseLeave (MouseEvent mouseEvent)
+        {
+            OnMouseLeaveCalled++;
+            mouseEvent.Handled = HandleOnLeave;
+
+            base.OnMouseLeave (mouseEvent);
+
+            return mouseEvent.Handled;
+        }
+    }
+
+    [Fact]
+    public void RaiseMouseEnterLeaveEvents_MouseEntersView_CallsOnMouseEnter ()
+    {
+        // Arrange
+        Application.Top = new () { Frame = new (0, 0, 10, 10) };
+        var view = new TestView ();
+        Application.Top.Add (view);
+        var mousePosition = new Point (1, 1);
+        List<View> currentViewsUnderMouse = new () { view };
+        var mouseEvent = new MouseEvent ()
+        {
+            Position = mousePosition,
+            ScreenPosition = mousePosition
+        };
+
+        Application._cachedViewsUnderMouse.Clear ();
+
+        try
+        {
+            // Act
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, currentViewsUnderMouse, mouseEvent);
+
+            // Assert
+            Assert.Equal (1, view.OnMouseEnterCalled);
+        }
+        finally
+        {
+            // Cleanup
+            Application.Top?.Dispose ();
+            Application.ResetState ();
+        }
+    }
+
+    [Fact]
+    public void RaiseMouseEnterLeaveEvents_MouseLeavesView_CallsOnMouseLeave ()
+    {
+        // Arrange
+        Application.Top = new () { Frame = new (0, 0, 10, 10) };
+        var view = new TestView ();
+        Application.Top.Add (view);
+        var mousePosition = new Point (0, 0);
+        List<View> currentViewsUnderMouse = new ();
+        var mouseEvent = new MouseEvent ();
+
+        Application._cachedViewsUnderMouse.Clear ();
+        Application._cachedViewsUnderMouse.Add (view);
+
+        try
+        {
+            // Act
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, currentViewsUnderMouse, mouseEvent);
+
+            // Assert
+            Assert.Equal (0, view.OnMouseEnterCalled);
+            Assert.Equal (1, view.OnMouseLeaveCalled);
+        }
+        finally
+        {
+            // Cleanup
+            Application.Top?.Dispose ();
+            Application.ResetState ();
+        }
+    }
+
+    [Fact]
+    public void RaiseMouseEnterLeaveEvents_MouseMovesBetweenAdjacentViews_CallsOnMouseEnterAndLeave ()
+    {
+        // Arrange
+        Application.Top = new () { Frame = new (0, 0, 10, 10) };
+        var view1 = new TestView (); // at 1,1 to 2,2
+        var view2 = new TestView () // at 2,2 to 3,3
+        {
+            X = 2,
+            Y = 2,
+        };
+        Application.Top.Add (view1);
+        Application.Top.Add (view2);
+
+
+
+        Application._cachedViewsUnderMouse.Clear ();
+
+        try
+        {
+            // Act
+            var mousePosition = new Point (0, 0);
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, View.GetViewsUnderMouse (mousePosition), new MouseEvent ()
+            {
+                Position = mousePosition,
+                ScreenPosition = mousePosition
+            });
+
+            // Assert
+            Assert.Equal (0, view1.OnMouseEnterCalled);
+            Assert.Equal (0, view1.OnMouseLeaveCalled);
+            Assert.Equal (0, view2.OnMouseEnterCalled);
+            Assert.Equal (0, view2.OnMouseLeaveCalled);
+
+            // Act
+            mousePosition = new Point (1, 1);
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, View.GetViewsUnderMouse (mousePosition), new MouseEvent ()
+            {
+                Position = mousePosition,
+                ScreenPosition = mousePosition
+            });
+
+            // Assert
+            Assert.Equal (1, view1.OnMouseEnterCalled);
+            Assert.Equal (0, view1.OnMouseLeaveCalled);
+            Assert.Equal (0, view2.OnMouseEnterCalled);
+            Assert.Equal (0, view2.OnMouseLeaveCalled);
+
+            // Act
+            mousePosition = new Point (2, 2);
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, View.GetViewsUnderMouse (mousePosition), new MouseEvent ()
+            {
+                Position = mousePosition,
+                ScreenPosition = mousePosition
+            });
+
+            // Assert
+            Assert.Equal (1, view1.OnMouseEnterCalled);
+            Assert.Equal (1, view1.OnMouseLeaveCalled);
+            Assert.Equal (1, view2.OnMouseEnterCalled);
+            Assert.Equal (0, view2.OnMouseLeaveCalled);
+
+
+            // Act
+            mousePosition = new Point (3, 3);
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, View.GetViewsUnderMouse (mousePosition), new MouseEvent ()
+            {
+                Position = mousePosition,
+                ScreenPosition = mousePosition
+            });
+
+            // Assert
+            Assert.Equal (1, view1.OnMouseEnterCalled);
+            Assert.Equal (1, view1.OnMouseLeaveCalled);
+            Assert.Equal (1, view2.OnMouseEnterCalled);
+            Assert.Equal (1, view2.OnMouseLeaveCalled);
+
+            // Act
+            mousePosition = new Point (0, 0);
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, View.GetViewsUnderMouse (mousePosition), new MouseEvent ()
+            {
+                Position = mousePosition,
+                ScreenPosition = mousePosition
+            });
+
+            // Assert
+            Assert.Equal (1, view1.OnMouseEnterCalled);
+            Assert.Equal (1, view1.OnMouseLeaveCalled);
+            Assert.Equal (1, view2.OnMouseEnterCalled);
+            Assert.Equal (1, view2.OnMouseLeaveCalled);
+        }
+        finally
+        {
+            // Cleanup
+            Application.Top?.Dispose ();
+            Application.ResetState ();
+        }
+    }
+
+    [Fact]
+    public void RaiseMouseEnterLeaveEvents_NoViewsUnderMouse_DoesNotCallOnMouseEnterOrLeave ()
+    {
+        // Arrange
+        Application.Top = new () { Frame = new (0, 0, 10, 10) };
+        var view = new TestView ();
+        Application.Top.Add (view);
+        var mousePosition = new Point (0, 0);
+        List<View> currentViewsUnderMouse = new ();
+        var mouseEvent = new MouseEvent ();
+
+        Application._cachedViewsUnderMouse.Clear ();
+
+        try
+        {
+            // Act
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, currentViewsUnderMouse, mouseEvent);
+
+            // Assert
+            Assert.Equal (0, view.OnMouseEnterCalled);
+            Assert.Equal (0, view.OnMouseLeaveCalled);
+        }
+        finally
+        {
+            // Cleanup
+            Application.Top?.Dispose ();
+            Application.ResetState ();
+        }
+    }
+
+
+    [Fact]
+    public void RaiseMouseEnterLeaveEvents_MouseMovesBetweenOverlappingViews_CallsOnMouseEnterAndLeave ()
+    {
+        // Arrange
+        Application.Top = new () { Frame = new (0, 0, 10, 10) };
+        var view1 = new TestView ()
+        {
+            Width = 2
+        }; // at 1,1 to 3,2
+        var view2 = new TestView () // at 2,2 to 4,3
+        {
+            Width = 2,
+            X = 2,
+            Y = 2,
+        };
+        Application.Top.Add (view1);
+        Application.Top.Add (view2);
+
+        Application._cachedViewsUnderMouse.Clear ();
+
+        try
+        {
+            // Act
+            var mousePosition = new Point (0, 0);
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, View.GetViewsUnderMouse (mousePosition), new MouseEvent ()
+            {
+                Position = mousePosition,
+                ScreenPosition = mousePosition
+            });
+
+            // Assert
+            Assert.Equal (0, view1.OnMouseEnterCalled);
+            Assert.Equal (0, view1.OnMouseLeaveCalled);
+            Assert.Equal (0, view2.OnMouseEnterCalled);
+            Assert.Equal (0, view2.OnMouseLeaveCalled);
+
+            // Act
+            mousePosition = new Point (1, 1);
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, View.GetViewsUnderMouse (mousePosition), new MouseEvent ()
+            {
+                Position = mousePosition,
+                ScreenPosition = mousePosition
+            });
+
+            // Assert
+            Assert.Equal (1, view1.OnMouseEnterCalled);
+            Assert.Equal (0, view1.OnMouseLeaveCalled);
+            Assert.Equal (0, view2.OnMouseEnterCalled);
+            Assert.Equal (0, view2.OnMouseLeaveCalled);
+
+            // Act
+            mousePosition = new Point (2, 2);
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, View.GetViewsUnderMouse (mousePosition), new MouseEvent ()
+            {
+                Position = mousePosition,
+                ScreenPosition = mousePosition
+            });
+
+            // Assert
+            Assert.Equal (1, view1.OnMouseEnterCalled);
+            Assert.Equal (1, view1.OnMouseLeaveCalled);
+            Assert.Equal (1, view2.OnMouseEnterCalled);
+            Assert.Equal (0, view2.OnMouseLeaveCalled);
+
+
+            // Act
+            mousePosition = new Point (3, 3);
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, View.GetViewsUnderMouse (mousePosition), new MouseEvent ()
+            {
+                Position = mousePosition,
+                ScreenPosition = mousePosition
+            });
+
+            // Assert
+            Assert.Equal (1, view1.OnMouseEnterCalled);
+            Assert.Equal (1, view1.OnMouseLeaveCalled);
+            Assert.Equal (1, view2.OnMouseEnterCalled);
+            Assert.Equal (1, view2.OnMouseLeaveCalled);
+
+            // Act
+            mousePosition = new Point (0, 0);
+            Application.RaiseMouseEnterLeaveEvents (mousePosition, View.GetViewsUnderMouse (mousePosition), new MouseEvent ()
+            {
+                Position = mousePosition,
+                ScreenPosition = mousePosition
+            });
+
+            // Assert
+            Assert.Equal (1, view1.OnMouseEnterCalled);
+            Assert.Equal (1, view1.OnMouseLeaveCalled);
+            Assert.Equal (1, view2.OnMouseEnterCalled);
+            Assert.Equal (1, view2.OnMouseLeaveCalled);
+        }
+        finally
+        {
+            // Cleanup
+            Application.Top?.Dispose ();
+            Application.ResetState ();
+        }
+    }
+}