Aura overlay scrollbars shouldn't invalidate thumb on scroll or enabled state.

third_party/WebKit/Source/platform/scroll/ScrollbarThemeOverlayTest.cpp

Index: third_party/WebKit/Source/platform/scroll/ScrollbarThemeOverlayTest.cpp
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollbarThemeOverlayTest.cpp b/third_party/WebKit/Source/platform/scroll/ScrollbarThemeOverlayTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..028ed37e448bd996966d8da1f78237a88cf7940c
--- /dev/null
+++ b/third_party/WebKit/Source/platform/scroll/ScrollbarThemeOverlayTest.cpp
@@ -0,0 +1,127 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "platform/scroll/ScrollbarThemeOverlay.h"
+
+#include "platform/scroll/ScrollbarTestSuite.h"
+
+namespace blink {
+
+using testing::NiceMock;
+using testing::Return;
+
+class ScrollbarThemeOverlayTest : public ScrollbarTestSuite {};
+
+TEST_F(ScrollbarThemeOverlayTest, PaintInvalidation) {
+  NiceMock<MockScrollableArea>* mockScrollableArea =
+      new NiceMock<MockScrollableArea>(ScrollOffset(100, 100));
+  ScrollbarThemeOverlay theme(14, 0, ScrollbarThemeOverlay::AllowHitTest);
+
+  Scrollbar* verticalScrollbar = Scrollbar::createForTesting(
+      mockScrollableArea, VerticalScrollbar, RegularScrollbar, &theme);
+  Scrollbar* horizontalScrollbar = Scrollbar::createForTesting(
+      mockScrollableArea, HorizontalScrollbar, RegularScrollbar, &theme);
+  ON_CALL(*mockScrollableArea, verticalScrollbar())
+      .WillByDefault(Return(verticalScrollbar));
+  ON_CALL(*mockScrollableArea, horizontalScrollbar())
+      .WillByDefault(Return(horizontalScrollbar));
+
+  IntRect verticalRect(1010, 0, 14, 768);
+  IntRect horizontalRect(0, 754, 1024, 14);
+  verticalScrollbar->setFrameRect(verticalRect);
+  horizontalScrollbar->setFrameRect(horizontalRect);
+
+  ASSERT_EQ(verticalScrollbar, mockScrollableArea->verticalScrollbar());
+  ASSERT_EQ(horizontalScrollbar, mockScrollableArea->horizontalScrollbar());
+
+  verticalScrollbar->clearTrackNeedsRepaint();
+  verticalScrollbar->clearThumbNeedsRepaint();
+  horizontalScrollbar->clearTrackNeedsRepaint();
+  horizontalScrollbar->clearThumbNeedsRepaint();
+  mockScrollableArea->clearNeedsPaintInvalidationForScrollControls();
+
+  ASSERT_FALSE(verticalScrollbar->thumbNeedsRepaint());
+  ASSERT_FALSE(verticalScrollbar->trackNeedsRepaint());
+  ASSERT_FALSE(mockScrollableArea->verticalScrollbarNeedsPaintInvalidation());
+  ASSERT_FALSE(horizontalScrollbar->thumbNeedsRepaint());
+  ASSERT_FALSE(horizontalScrollbar->trackNeedsRepaint());
+  ASSERT_FALSE(mockScrollableArea->horizontalScrollbarNeedsPaintInvalidation());
+
+  // Changing the scroll offset shouldn't invalide the thumb nor track, but it
+  // should cause a "general" invalidation for non-composited scrollbars.
+  // Ensure the horizontal scrollbar is unaffected.
+  mockScrollableArea->updateScrollOffset(ScrollOffset(0, 5), UserScroll);
+  verticalScrollbar->offsetDidChange();
+  horizontalScrollbar->offsetDidChange();
+  EXPECT_FALSE(verticalScrollbar->thumbNeedsRepaint());
+  EXPECT_FALSE(verticalScrollbar->trackNeedsRepaint());
+  EXPECT_TRUE(mockScrollableArea->verticalScrollbarNeedsPaintInvalidation());
+  EXPECT_FALSE(horizontalScrollbar->thumbNeedsRepaint());
+  EXPECT_FALSE(horizontalScrollbar->trackNeedsRepaint());
+  EXPECT_FALSE(mockScrollableArea->horizontalScrollbarNeedsPaintInvalidation());
+
+  // Try the horizontal scrollbar.
+  mockScrollableArea->clearNeedsPaintInvalidationForScrollControls();
+  mockScrollableArea->updateScrollOffset(ScrollOffset(5, 5), UserScroll);
+  horizontalScrollbar->offsetDidChange();
+  verticalScrollbar->offsetDidChange();
+  EXPECT_FALSE(verticalScrollbar->thumbNeedsRepaint());
+  EXPECT_FALSE(verticalScrollbar->trackNeedsRepaint());
+  EXPECT_FALSE(mockScrollableArea->verticalScrollbarNeedsPaintInvalidation());
+  EXPECT_FALSE(horizontalScrollbar->thumbNeedsRepaint());
+  EXPECT_FALSE(horizontalScrollbar->trackNeedsRepaint());
+  EXPECT_TRUE(mockScrollableArea->horizontalScrollbarNeedsPaintInvalidation());
+
+  mockScrollableArea->clearNeedsPaintInvalidationForScrollControls();
+
+  // Move the mouse over the vertical scrollbar's thumb. Ensure the thumb is
+  // invalidated as its state is changed to hover.
+  verticalScrollbar->setHoveredPart(ThumbPart);
+  EXPECT_TRUE(verticalScrollbar->thumbNeedsRepaint());
+  EXPECT_TRUE(mockScrollableArea->verticalScrollbarNeedsPaintInvalidation());
+
+  verticalScrollbar->clearThumbNeedsRepaint();
+  mockScrollableArea->clearNeedsPaintInvalidationForScrollControls();
+
+  // Pressing down should also cause an invalidation.
+  verticalScrollbar->setPressedPart(ThumbPart);
+  EXPECT_TRUE(verticalScrollbar->thumbNeedsRepaint());
+  EXPECT_TRUE(mockScrollableArea->verticalScrollbarNeedsPaintInvalidation());
+
+  verticalScrollbar->clearThumbNeedsRepaint();
+  mockScrollableArea->clearNeedsPaintInvalidationForScrollControls();
+
+  // Release should cause invalidation.
+  verticalScrollbar->setPressedPart(NoPart);
+  EXPECT_TRUE(verticalScrollbar->thumbNeedsRepaint());
+  EXPECT_TRUE(mockScrollableArea->verticalScrollbarNeedsPaintInvalidation());
+
+  verticalScrollbar->clearThumbNeedsRepaint();
+  mockScrollableArea->clearNeedsPaintInvalidationForScrollControls();
+
+  // Move off should cause invalidation
+  verticalScrollbar->setHoveredPart(NoPart);
+  EXPECT_TRUE(verticalScrollbar->thumbNeedsRepaint());
+  EXPECT_TRUE(mockScrollableArea->verticalScrollbarNeedsPaintInvalidation());
+
+  verticalScrollbar->clearThumbNeedsRepaint();
+  mockScrollableArea->clearNeedsPaintInvalidationForScrollControls();
+
+  // Disabling the scrollbar is used to hide it so it should cause invalidation
+  // but only in the general sense since the compositor will have hidden it
+  // without a repaint.
+  verticalScrollbar->setEnabled(false);
+  EXPECT_FALSE(verticalScrollbar->thumbNeedsRepaint());
+  EXPECT_TRUE(mockScrollableArea->verticalScrollbarNeedsPaintInvalidation());
+
+  mockScrollableArea->clearNeedsPaintInvalidationForScrollControls();
+
+  verticalScrollbar->setEnabled(true);
+  EXPECT_FALSE(verticalScrollbar->thumbNeedsRepaint());
+  EXPECT_TRUE(mockScrollableArea->verticalScrollbarNeedsPaintInvalidation());
+
+  ThreadState::current()->collectAllGarbage();
+}
+
+}  // namespace blink