1 files changed, 48 insertions, 0 deletions
diff --git a/gfx/layers/apz/test/gtest/TestInputQueue.cpp b/gfx/layers/apz/test/gtest/TestInputQueue.cpp
new file mode 100644
index 0000000000..18d1c00a2d
--- /dev/null
+++ b/gfx/layers/apz/test/gtest/TestInputQueue.cpp
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "APZCTreeManagerTester.h"
+#include "APZTestCommon.h"
+#include "InputUtils.h"
+
+// Test of scenario described in bug 1269067 - that a continuing mouse drag
+// doesn't interrupt a wheel scrolling animation
+TEST_F(APZCTreeManagerTester, WheelInterruptedByMouseDrag) {
+  // Needed because the test uses SmoothWheel()
+  SCOPED_GFX_PREF_BOOL("general.smoothScroll", true);
+
+  // Set up a scrollable layer
+  CreateSimpleScrollingLayer();
+  ScopedLayerTreeRegistration registration(LayersId{0}, mcc);
+  UpdateHitTestingTree();
+  RefPtr<TestAsyncPanZoomController> apzc = ApzcOf(root);
+
+  // First start the mouse drag
+  uint64_t dragBlockId =
+      MouseDown(apzc, ScreenIntPoint(5, 5), mcc->Time()).mInputBlockId;
+  uint64_t tmpBlockId =
+      MouseMove(apzc, ScreenIntPoint(6, 6), mcc->Time()).mInputBlockId;
+  EXPECT_EQ(dragBlockId, tmpBlockId);
+
+  // Insert the wheel event, check that it has a new block id
+  uint64_t wheelBlockId =
+      SmoothWheel(apzc, ScreenIntPoint(6, 6), ScreenPoint(0, 1), mcc->Time())
+          .mInputBlockId;
+  EXPECT_NE(dragBlockId, wheelBlockId);
+
+  // Continue the drag, check that the block id is the same as before
+  tmpBlockId = MouseMove(apzc, ScreenIntPoint(7, 5), mcc->Time()).mInputBlockId;
+  EXPECT_EQ(dragBlockId, tmpBlockId);
+
+  // Finish the wheel animation
+  apzc->AdvanceAnimationsUntilEnd();
+
+  // Check that it scrolled
+  ParentLayerPoint scroll = apzc->GetCurrentAsyncScrollOffset(
+      AsyncPanZoomController::eForEventHandling);
+  EXPECT_EQ(scroll.x, 0);
+  EXPECT_EQ(scroll.y, 10);  // We scrolled 1 "line" or 10 pixels
+}