Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/ScrollableArea.h

Index: Source/core/platform/ScrollableArea.h
diff --git a/Source/core/platform/ScrollableArea.h b/Source/core/platform/ScrollableArea.h
deleted file mode 100644
index 1dc7b2eb9b3e1bd636e3543f17e6557b75f5fba9..0000000000000000000000000000000000000000
--- a/Source/core/platform/ScrollableArea.h
+++ /dev/null
@@ -1,247 +0,0 @@
-/*
- * Copyright (C) 2008, 2011 Apple 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
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef ScrollableArea_h
-#define ScrollableArea_h
-
-#include "core/platform/Scrollbar.h"
-#include "wtf/Vector.h"
-
-namespace WebCore {
-
-class FloatPoint;
-class GraphicsContext;
-class GraphicsLayer;
-class PlatformGestureEvent;
-class PlatformWheelEvent;
-class ScrollAnimator;
-
-class ScrollableArea {
-public:
-    static int pixelsPerLineStep();
-    static float minFractionToStepWhenPaging();
-    static int maxOverlapBetweenPages();
-
-    bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1);
-    void scrollToOffsetWithoutAnimation(const FloatPoint&);
-    void scrollToOffsetWithoutAnimation(ScrollbarOrientation, float offset);
-
-    // Should be called when the scroll position changes externally, for example if the scroll layer position
-    // is updated on the scrolling thread and we need to notify the main thread.
-    void notifyScrollPositionChanged(const IntPoint&);
-
-    bool handleWheelEvent(const PlatformWheelEvent&);
-
-    // Functions for controlling if you can scroll past the end of the document.
-    bool constrainsScrollingToContentEdge() const { return m_constrainsScrollingToContentEdge; }
-    void setConstrainsScrollingToContentEdge(bool constrainsScrollingToContentEdge) { m_constrainsScrollingToContentEdge = constrainsScrollingToContentEdge; }
-
-    void setVerticalScrollElasticity(ScrollElasticity scrollElasticity) { m_verticalScrollElasticity = scrollElasticity; }
-    ScrollElasticity verticalScrollElasticity() const { return static_cast<ScrollElasticity>(m_verticalScrollElasticity); }
-
-    void setHorizontalScrollElasticity(ScrollElasticity scrollElasticity) { m_horizontalScrollElasticity = scrollElasticity; }
-    ScrollElasticity horizontalScrollElasticity() const { return static_cast<ScrollElasticity>(m_horizontalScrollElasticity); }
-
-    bool inLiveResize() const { return m_inLiveResize; }
-    void willStartLiveResize();
-    void willEndLiveResize();
-
-    void contentAreaWillPaint() const;
-    void mouseEnteredContentArea() const;
-    void mouseExitedContentArea() const;
-    void mouseMovedInContentArea() const;
-    void mouseEnteredScrollbar(Scrollbar*) const;
-    void mouseExitedScrollbar(Scrollbar*) const;
-    void contentAreaDidShow() const;
-    void contentAreaDidHide() const;
-
-    void finishCurrentScrollAnimations() const;
-
-    virtual void didAddScrollbar(Scrollbar*, ScrollbarOrientation);
-    virtual void willRemoveScrollbar(Scrollbar*, ScrollbarOrientation);
-
-    virtual void contentsResized();
-
-    bool hasOverlayScrollbars() const;
-    void setScrollbarOverlayStyle(ScrollbarOverlayStyle);
-    ScrollbarOverlayStyle scrollbarOverlayStyle() const { return static_cast<ScrollbarOverlayStyle>(m_scrollbarOverlayStyle); }
-
-    // This getter will create a ScrollAnimator if it doesn't already exist.
-    ScrollAnimator* scrollAnimator() const;
-
-    // This getter will return null if the ScrollAnimator hasn't been created yet.
-    ScrollAnimator* existingScrollAnimator() const { return m_scrollAnimator.get(); }
-
-    const IntPoint& scrollOrigin() const { return m_scrollOrigin; }
-    bool scrollOriginChanged() const { return m_scrollOriginChanged; }
-
-    virtual bool isActive() const = 0;
-    virtual int scrollSize(ScrollbarOrientation) const = 0;
-    virtual void invalidateScrollbar(Scrollbar*, const IntRect&);
-    virtual bool isScrollCornerVisible() const = 0;
-    virtual IntRect scrollCornerRect() const = 0;
-    virtual void invalidateScrollCorner(const IntRect&);
-    virtual void getTickmarks(Vector<IntRect>&) const { }
-
-    // Convert points and rects between the scrollbar and its containing view.
-    // The client needs to implement these in order to be aware of layout effects
-    // like CSS transforms.
-    virtual IntRect convertFromScrollbarToContainingView(const Scrollbar* scrollbar, const IntRect& scrollbarRect) const
-    {
-        return scrollbar->Widget::convertToContainingView(scrollbarRect);
-    }
-    virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntRect& parentRect) const
-    {
-        return scrollbar->Widget::convertFromContainingView(parentRect);
-    }
-    virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar* scrollbar, const IntPoint& scrollbarPoint) const
-    {
-        return scrollbar->Widget::convertToContainingView(scrollbarPoint);
-    }
-    virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar* scrollbar, const IntPoint& parentPoint) const
-    {
-        return scrollbar->Widget::convertFromContainingView(parentPoint);
-    }
-
-    virtual Scrollbar* horizontalScrollbar() const { return 0; }
-    virtual Scrollbar* verticalScrollbar() const { return 0; }
-
-    // scrollPosition is relative to the scrollOrigin. i.e. If the page is RTL
-    // then scrollPosition will be negative.
-    virtual IntPoint scrollPosition() const = 0;
-    virtual IntPoint minimumScrollPosition() const = 0;
-    virtual IntPoint maximumScrollPosition() const = 0;
-
-    enum IncludeScrollbarsInRect { ExcludeScrollbars, IncludeScrollbars };
-    virtual IntRect visibleContentRect(IncludeScrollbarsInRect = ExcludeScrollbars) const;
-    virtual int visibleHeight() const = 0;
-    virtual int visibleWidth() const = 0;
-    virtual IntSize contentsSize() const = 0;
-    virtual IntSize overhangAmount() const { return IntSize(); }
-    virtual IntPoint lastKnownMousePosition() const { return IntPoint(); }
-
-    virtual bool shouldSuspendScrollAnimations() const { return true; }
-    virtual void scrollbarStyleChanged(int /*newStyle*/, bool /*forceUpdate*/) { }
-
-    virtual bool scrollbarsCanBeActive() const = 0;
-
-    // Note that this only returns scrollable areas that can actually be scrolled.
-    virtual ScrollableArea* enclosingScrollableArea() const = 0;
-
-    // Returns the bounding box of this scrollable area, in the coordinate system of the enclosing scroll view.
-    virtual IntRect scrollableAreaBoundingBox() const = 0;
-
-    virtual bool shouldRubberBandInDirection(ScrollDirection) const { return true; }
-    virtual bool isRubberBandInProgress() const { return false; }
-
-    virtual bool scrollAnimatorEnabled() const { return false; }
-
-    // NOTE: Only called from Internals for testing.
-    void setScrollOffsetFromInternals(const IntPoint&);
-
-    IntPoint clampScrollPosition(const IntPoint&) const;
-
-    // Let subclasses provide a way of asking for and servicing scroll
-    // animations.
-    virtual bool scheduleAnimation() { return false; }
-    void serviceScrollAnimations();
-
-    virtual bool usesCompositedScrolling() const { return false; }
-    virtual void updateNeedsCompositedScrolling() { }
-    virtual void updateHasVisibleNonLayerContent() { }
-
-    virtual bool userInputScrollable(ScrollbarOrientation) const = 0;
-    virtual bool shouldPlaceVerticalScrollbarOnLeft() const = 0;
-
-    // Convenience functions
-    int scrollPosition(ScrollbarOrientation orientation) { return orientation == HorizontalScrollbar ? scrollPosition().x() : scrollPosition().y(); }
-    int minimumScrollPosition(ScrollbarOrientation orientation) { return orientation == HorizontalScrollbar ? minimumScrollPosition().x() : minimumScrollPosition().y(); }
-    int maximumScrollPosition(ScrollbarOrientation orientation) { return orientation == HorizontalScrollbar ? maximumScrollPosition().x() : maximumScrollPosition().y(); }
-    int clampScrollPosition(ScrollbarOrientation orientation, int pos)  { return std::max(std::min(pos, maximumScrollPosition(orientation)), minimumScrollPosition(orientation)); }
-
-protected:
-    ScrollableArea();
-    virtual ~ScrollableArea();
-
-    void setScrollOrigin(const IntPoint&);
-    void resetScrollOriginChanged() { m_scrollOriginChanged = false; }
-
-    virtual void invalidateScrollbarRect(Scrollbar*, const IntRect&) = 0;
-    virtual void invalidateScrollCornerRect(const IntRect&) = 0;
-
-    friend class ScrollingCoordinator;
-    virtual GraphicsLayer* layerForScrolling() const { return 0; }
-    virtual GraphicsLayer* layerForHorizontalScrollbar() const { return 0; }
-    virtual GraphicsLayer* layerForVerticalScrollbar() const { return 0; }
-    virtual GraphicsLayer* layerForScrollCorner() const { return 0; }
-    bool hasLayerForHorizontalScrollbar() const;
-    bool hasLayerForVerticalScrollbar() const;
-    bool hasLayerForScrollCorner() const;
-
-private:
-    void scrollPositionChanged(const IntPoint&);
-
-    // NOTE: Only called from the ScrollAnimator.
-    friend class ScrollAnimator;
-    void setScrollOffsetFromAnimation(const IntPoint&);
-
-    // This function should be overriden by subclasses to perform the actual
-    // scroll of the content.
-    virtual void setScrollOffset(const IntPoint&) = 0;
-
-    virtual int lineStep(ScrollbarOrientation) const;
-    virtual int pageStep(ScrollbarOrientation) const = 0;
-    virtual int documentStep(ScrollbarOrientation) const;
-    virtual float pixelStep(ScrollbarOrientation) const;
-
-    mutable OwnPtr<ScrollAnimator> m_scrollAnimator;
-    unsigned m_constrainsScrollingToContentEdge : 1;
-
-    unsigned m_inLiveResize : 1;
-
-    unsigned m_verticalScrollElasticity : 2; // ScrollElasticity
-    unsigned m_horizontalScrollElasticity : 2; // ScrollElasticity
-
-    unsigned m_scrollbarOverlayStyle : 2; // ScrollbarOverlayStyle
-
-    unsigned m_scrollOriginChanged : 1;
-
-    // There are 8 possible combinations of writing mode and direction. Scroll origin will be non-zero in the x or y axis
-    // if there is any reversed direction or writing-mode. The combinations are:
-    // writing-mode / direction     scrollOrigin.x() set    scrollOrigin.y() set
-    // horizontal-tb / ltr          NO                      NO
-    // horizontal-tb / rtl          YES                     NO
-    // horizontal-bt / ltr          NO                      YES
-    // horizontal-bt / rtl          YES                     YES
-    // vertical-lr / ltr            NO                      NO
-    // vertical-lr / rtl            NO                      YES
-    // vertical-rl / ltr            YES                     NO
-    // vertical-rl / rtl            YES                     YES
-    IntPoint m_scrollOrigin;
-};
-
-} // namespace WebCore
-
-#endif // ScrollableArea_h