Mac: Don't repaint scrollbars every frame

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

 // Copyright 2015 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 "config.h"
 #include "platform/scroll/ScrollableArea.h"
 
+#include "platform/scroll/ScrollbarTheme.h"
+#include "platform/scroll/ScrollbarThemeMock.h"
 #include "platform/testing/TestingPlatformSupport.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebScheduler.h"
 #include "public/platform/WebThread.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 namespace {
 
 class MockScrollableArea : public NoBaseWillBeGarbageCollectedFinalized<MockScrollableArea>, public ScrollableArea {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MockScrollableArea);
 public:
     static PassOwnPtrWillBeRawPtr<MockScrollableArea> create(const IntPoint& maximumScrollPosition)
     {
         return adoptPtrWillBeNoop(new MockScrollableArea(maximumScrollPosition));
     }
 
     MOCK_CONST_METHOD0(isActive, bool());
     MOCK_CONST_METHOD1(scrollSize, int(ScrollbarOrientation));
     MOCK_CONST_METHOD0(isScrollCornerVisible, bool());
     MOCK_CONST_METHOD0(scrollCornerRect, IntRect());
     MOCK_METHOD0(scrollControlWasSetNeedsPaintInvalidation, void());
     MOCK_CONST_METHOD0(enclosingScrollableArea, ScrollableArea*());
     MOCK_CONST_METHOD1(visibleContentRect, IntRect(IncludeScrollbarsInRect));
     MOCK_CONST_METHOD0(contentsSize, IntSize());
-    MOCK_CONST_METHOD0(scrollbarsCanBeActive, bool());
     MOCK_CONST_METHOD0(scrollableAreaBoundingBox, IntRect());
 
     bool userInputScrollable(ScrollbarOrientation) const override { return true; }
+    bool scrollbarsCanBeActive () const override { return true; }
     bool shouldPlaceVerticalScrollbarOnLeft() const override { return false; }
     void setScrollOffset(const IntPoint& offset, ScrollType) override { m_scrollPosition = offset.shrunkTo(m_maximumScrollPosition); }
     IntPoint scrollPosition() const override { return m_scrollPosition; }
     IntPoint minimumScrollPosition() const override { return IntPoint(); }
     IntPoint maximumScrollPosition() const override { return m_maximumScrollPosition; }
     int visibleHeight() const override { return 768; }
     int visibleWidth() const override { return 1024; }
     bool scrollAnimatorEnabled() const override { return false; }
     int pageStep(ScrollbarOrientation) const override { return 0; }
 
@@ skipping 71 matching lines @@
     Platform* m_oldPlatform; // Not owned.
 };
 
 TEST_F(ScrollableAreaTest, ScrollAnimatorCurrentPositionShouldBeSync)
 {
     OwnPtrWillBeRawPtr<MockScrollableArea> scrollableArea = MockScrollableArea::create(IntPoint(0, 100));
     scrollableArea->setScrollPosition(IntPoint(0, 10000), CompositorScroll);
     EXPECT_EQ(100.0, scrollableArea->scrollAnimator()->currentPosition().y());
 }
 
+TEST_F(ScrollableAreaTest, ScrollbarTrackAndThumbRepaint)
+{
+    ScrollbarTheme::setMockScrollbarsEnabled(true);
+    ScrollbarThemeMock::setShouldRepaintAllPartsOnInvalidation(true);
+
+    OwnPtrWillBeRawPtr<MockScrollableArea> scrollableArea = MockScrollableArea::create(IntPoint(0, 100));
+    RefPtrWillBeRawPtr<Scrollbar> scrollbar = Scrollbar::create(scrollableArea.get(), HorizontalScrollbar, RegularScrollbar);
+
+    EXPECT_TRUE(scrollbar->trackNeedsRepaint());
+    EXPECT_TRUE(scrollbar->thumbNeedsRepaint());
+    scrollbar->setNeedsPaintInvalidation();
+    EXPECT_TRUE(scrollbar->trackNeedsRepaint());
+    EXPECT_TRUE(scrollbar->thumbNeedsRepaint());
+
+    scrollbar->setTrackNeedsRepaint(false);
+    scrollbar->setThumbNeedsRepaint(false);
+    EXPECT_FALSE(scrollbar->trackNeedsRepaint());
+    EXPECT_FALSE(scrollbar->thumbNeedsRepaint());
+    scrollbar->setNeedsPaintInvalidation();
+    EXPECT_TRUE(scrollbar->trackNeedsRepaint());
+    EXPECT_TRUE(scrollbar->thumbNeedsRepaint());
+
+    ScrollbarThemeMock::setShouldRepaintAllPartsOnInvalidation(false);
+    scrollbar->setTrackNeedsRepaint(false);
+    scrollbar->setThumbNeedsRepaint(false);
+    EXPECT_FALSE(scrollbar->trackNeedsRepaint());
+    EXPECT_FALSE(scrollbar->thumbNeedsRepaint());
+    scrollbar->setNeedsPaintInvalidation();
+    EXPECT_FALSE(scrollbar->trackNeedsRepaint());
+    EXPECT_FALSE(scrollbar->thumbNeedsRepaint());
+}
+
 } // namespace blink