Calculate paint invalidation rect for scrollbars

third_party/WebKit/Source/platform/scroll/Scrollbar.h

 /*
  * Copyright (C) 2004, 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 47 matching lines @@
     int height() const override { return Widget::height(); }
     IntSize size() const override { return Widget::size(); }
     IntPoint location() const override { return Widget::location(); }
 
     Widget* parent() const override { return Widget::parent(); }
     Widget* root() const override { return Widget::root(); }
 
     void setFrameRect(const IntRect&) override;
     IntRect frameRect() const override { return Widget::frameRect(); }
 
-    void invalidate() override { Widget::invalidate(); }
-    void invalidateRect(const IntRect&) override;
-
     ScrollbarOverlayStyle scrollbarOverlayStyle() const override;
     void getTickmarks(Vector<IntRect>&) const override;
     bool isScrollableAreaActive() const override;
 
     IntPoint convertFromContainingWindow(const IntPoint& windowPoint) const override { return Widget::convertFromContainingWindow(windowPoint); }
 
     bool isCustomScrollbar() const override { return false; }
     ScrollbarOrientation orientation() const override { return m_orientation; }
     bool isLeftSideVerticalScrollbar() const override;
 
@@ skipping 41 matching lines @@
     void mouseMoved(const PlatformMouseEvent&);
     void mouseEntered();
     void mouseExited();
 
     // Used by some platform scrollbars to know when they've been released from capture.
     void mouseUp(const PlatformMouseEvent&);
     void mouseDown(const PlatformMouseEvent&);
 
     ScrollbarTheme* theme() const { return m_theme; }
 
-    bool suppressInvalidation() const { return m_suppressInvalidation; }
-    void setSuppressInvalidation(bool s) { m_suppressInvalidation = s; }
-
     IntRect convertToContainingView(const IntRect&) const override;
     IntRect convertFromContainingView(const IntRect&) const override;
 
     IntPoint convertToContainingView(const IntPoint&) const override;
     IntPoint convertFromContainingView(const IntPoint&) const override;
 
     void moveThumb(int pos, bool draggingDocument = false);
 
     bool isAlphaLocked() const override { return m_isAlphaLocked; }
     void setIsAlphaLocked(bool flag) override { m_isAlphaLocked = flag; }
 
     float elasticOverscroll() const override { return m_elasticOverscroll; }
     void setElasticOverscroll(float elasticOverscroll) override { m_elasticOverscroll = elasticOverscroll; }
 
     bool overlapsResizer() const { return m_overlapsResizer; }
     void setOverlapsResizer(bool overlapsResizer) { m_overlapsResizer = overlapsResizer; }
 
     DisplayItemClient displayItemClient() const override { return toDisplayItemClient(this); }
     String debugName() const override { return m_orientation == HorizontalScrollbar ? "HorizontalScrollbar" : "VerticalScrollbar"; }
 
+    void setNeedsPaintInvalidation();
+
     // Promptly unregister from the theme manager + run finalizers of derived Scrollbars.
     EAGERLY_FINALIZE();
 #if ENABLE(OILPAN)
     DECLARE_EAGER_FINALIZATION_OPERATOR_NEW();
 #endif
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     Scrollbar(ScrollableArea*, ScrollbarOrientation, ScrollbarControlSize, ScrollbarTheme* = 0);
 
@@ skipping 23 matching lines @@
     int m_pressedPos;
     float m_scrollPos;
     bool m_draggingDocument;
     int m_documentDragPos;
 
     bool m_enabled;
 
     Timer<Scrollbar> m_scrollTimer;
     bool m_overlapsResizer;
 
-    bool m_suppressInvalidation;
-
     bool m_isAlphaLocked;
 
     float m_elasticOverscroll;
 
 private:
     bool isScrollbar() const override { return true; }
 
+    void invalidate() override { setNeedsPaintInvalidation(); }
+    void invalidateRect(const IntRect&) override { setNeedsPaintInvalidation(); }
+
     float scrollableAreaCurrentPos() const;
 };
 
 DEFINE_TYPE_CASTS(Scrollbar, Widget, widget, widget->isScrollbar(), widget.isScrollbar());
 
 } // namespace blink
 
 #endif // Scrollbar_h