diff --git a/src/Avalonia.Input/Pointer.cs b/src/Avalonia.Input/Pointer.cs index 80d803abb1..819d231b31 100644 --- a/src/Avalonia.Input/Pointer.cs +++ b/src/Avalonia.Input/Pointer.cs @@ -37,7 +37,7 @@ namespace Avalonia.Input { if (Captured != null) Captured.DetachedFromVisualTree -= OnCaptureDetached; - var oldCapture = control; + var oldCapture = Captured; Captured = control; PlatformCapture(control); if (oldCapture != null) diff --git a/tests/Avalonia.Input.UnitTests/PointerTests.cs b/tests/Avalonia.Input.UnitTests/PointerTests.cs new file mode 100644 index 0000000000..e639726dbd --- /dev/null +++ b/tests/Avalonia.Input.UnitTests/PointerTests.cs @@ -0,0 +1,39 @@ +using System.Collections.Generic; +using System.Linq; +using Avalonia.Controls; +using Avalonia.UnitTests; +using Avalonia.VisualTree; +using Xunit; + +namespace Avalonia.Input.UnitTests +{ + public class PointerTests + { + [Fact] + public void On_Capture_Transfer_PointerCaptureLost_Should_Propagate_Up_To_The_Common_Parent() + { + Border initialParent, initialCapture, newParent, newCapture; + var el = new StackPanel + { + Children = + { + (initialParent = new Border { Child = initialCapture = new Border() }), + (newParent = new Border { Child = newCapture = new Border() }) + } + }; + var receivers = new List(); + var root = new TestRoot(el); + foreach (InputElement d in root.GetSelfAndVisualDescendants()) + d.PointerCaptureLost += (s, e) => receivers.Add(s); + var pointer = new Pointer(Pointer.GetNextFreeId(), PointerType.Mouse, true); + + pointer.Capture(initialCapture); + pointer.Capture(newCapture); + Assert.True(receivers.SequenceEqual(new[] { initialCapture, initialParent })); + + receivers.Clear(); + pointer.Capture(null); + Assert.True(receivers.SequenceEqual(new object[] { newCapture, newParent, el, root })); + } + } +}