diff --git a/src/Avalonia.Controls/Mixins/PressedMixin.cs b/src/Avalonia.Controls/Mixins/PressedMixin.cs new file mode 100644 index 0000000000..01b0a8564f --- /dev/null +++ b/src/Avalonia.Controls/Mixins/PressedMixin.cs @@ -0,0 +1,33 @@ +using Avalonia.Interactivity; +using Avalonia.Input; + +namespace Avalonia.Controls.Mixins +{ + /// + /// Adds pressed functionality to control classes. + /// + /// Adds the ':pressed' class when the item is pressed. + /// + public static class PressedMixin + { + private static void HandlePointerPressed(TControl sender, PointerPressedEventArgs e) where TControl : Control + { + if (e.GetCurrentPoint(sender).Properties.IsLeftButtonPressed) + { + ((IPseudoClasses)sender.Classes).Set(":pressed", true); + } + } + + private static void HandlePointerReleased(TControl sender) where TControl : Control + { + ((IPseudoClasses)sender.Classes).Set(":pressed", false); + } + + public static void Attach() where TControl : Control + { + InputElement.PointerPressedEvent.AddClassHandler((x, e) => HandlePointerPressed(x, e), RoutingStrategies.Tunnel, true); + InputElement.PointerReleasedEvent.AddClassHandler((x, e) => HandlePointerReleased(x), RoutingStrategies.Tunnel, true); + InputElement.PointerCaptureLostEvent.AddClassHandler((x, e) => HandlePointerReleased(x), RoutingStrategies.Tunnel, true); + } + } +} diff --git a/tests/Avalonia.Controls.UnitTests/Mixins/PressedMixinTests.cs b/tests/Avalonia.Controls.UnitTests/Mixins/PressedMixinTests.cs new file mode 100644 index 0000000000..0ff1f40121 --- /dev/null +++ b/tests/Avalonia.Controls.UnitTests/Mixins/PressedMixinTests.cs @@ -0,0 +1,37 @@ +using Avalonia.Controls.Mixins; +using Avalonia.UnitTests; +using Xunit; + +namespace Avalonia.Controls.UnitTests.Mixins +{ + public class PressedMixinTests + { + private MouseTestHelper _mouse = new MouseTestHelper(); + + [Fact] + public void Selected_Class_Should_Not_Initially_Be_Added() + { + var target = new TestControl(); + + Assert.Empty(target.Classes); + } + + [Fact] + public void Setting_IsSelected_Should_Add_Selected_Class() + { + var target = new TestControl(); + + _mouse.Down(target); + + Assert.Equal(new[] { ":pressed" }, target.Classes); + } + + private class TestControl : Control + { + static TestControl() + { + PressedMixin.Attach(); + } + } + } +}