Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/ScrollView.h

Index: Source/core/platform/ScrollView.h
diff --git a/Source/core/platform/ScrollView.h b/Source/core/platform/ScrollView.h
deleted file mode 100644
index 2fe86daf1a4275d9afa92cb6fa9d5a61e7c3f200..0000000000000000000000000000000000000000
--- a/Source/core/platform/ScrollView.h
+++ /dev/null
@@ -1,361 +0,0 @@
-/*
- * Copyright (C) 2004, 2006, 2007, 2008 Apple Inc. All rights reserved.
- * Copyright (C) 2009 Holger Hans Peter Freyther
- *
- * 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 COMPUTER, 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 COMPUTER, 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 ScrollView_h
-#define ScrollView_h
-
-#include "core/platform/ScrollableArea.h"
-#include "core/platform/Scrollbar.h"
-#include "platform/Widget.h"
-#include "platform/geometry/IntRect.h"
-#include "platform/scroll/ScrollTypes.h"
-
-#include "wtf/HashSet.h"
-
-namespace WebCore {
-
-class HostWindow;
-class Scrollbar;
-
-class ScrollView : public Widget, public ScrollableArea {
-public:
-    ~ScrollView();
-
-    // ScrollableArea functions.
-    virtual int scrollSize(ScrollbarOrientation) const OVERRIDE;
-    virtual void setScrollOffset(const IntPoint&) OVERRIDE;
-    virtual bool isScrollCornerVisible() const OVERRIDE;
-    virtual void scrollbarStyleChanged(int newStyle, bool forceUpdate) OVERRIDE;
-    virtual bool userInputScrollable(ScrollbarOrientation) const OVERRIDE;
-    virtual bool shouldPlaceVerticalScrollbarOnLeft() const OVERRIDE;
-
-    virtual void notifyPageThatContentAreaWillPaint() const;
-
-    // NOTE: This should only be called by the overriden setScrollOffset from ScrollableArea.
-    virtual void scrollTo(const IntSize& newOffset);
-
-    // The window thats hosts the ScrollView. The ScrollView will communicate scrolls and repaints to the
-    // host window in the window's coordinate space.
-    virtual HostWindow* hostWindow() const = 0;
-
-    // Returns a clip rect in host window coordinates. Used to clip the blit on a scroll.
-    virtual IntRect windowClipRect(bool clipToContents = true) const = 0;
-
-    // Functions for child manipulation and inspection.
-    const HashSet<RefPtr<Widget> >* children() const { return &m_children; }
-    virtual void addChild(PassRefPtr<Widget>);
-    virtual void removeChild(Widget*);
-
-    // If the scroll view does not use a native widget, then it will have cross-platform Scrollbars. These functions
-    // can be used to obtain those scrollbars.
-    virtual Scrollbar* horizontalScrollbar() const OVERRIDE { return m_horizontalScrollbar.get(); }
-    virtual Scrollbar* verticalScrollbar() const OVERRIDE { return m_verticalScrollbar.get(); }
-    bool isScrollViewScrollbar(const Widget* child) const { return horizontalScrollbar() == child || verticalScrollbar() == child; }
-
-    void positionScrollbarLayers();
-
-    // Functions for setting and retrieving the scrolling mode in each axis (horizontal/vertical). The mode has values of
-    // AlwaysOff, AlwaysOn, and Auto. AlwaysOff means never show a scrollbar, AlwaysOn means always show a scrollbar.
-    // Auto means show a scrollbar only when one is needed.
-    // Note that for platforms with native widgets, these modes are considered advisory. In other words the underlying native
-    // widget may choose not to honor the requested modes.
-    void setScrollbarModes(ScrollbarMode horizontalMode, ScrollbarMode verticalMode, bool horizontalLock = false, bool verticalLock = false);
-    void setHorizontalScrollbarMode(ScrollbarMode mode, bool lock = false) { setScrollbarModes(mode, verticalScrollbarMode(), lock, verticalScrollbarLock()); }
-    void setVerticalScrollbarMode(ScrollbarMode mode, bool lock = false) { setScrollbarModes(horizontalScrollbarMode(), mode, horizontalScrollbarLock(), lock); };
-    void scrollbarModes(ScrollbarMode& horizontalMode, ScrollbarMode& verticalMode) const;
-    ScrollbarMode horizontalScrollbarMode() const { ScrollbarMode horizontal, vertical; scrollbarModes(horizontal, vertical); return horizontal; }
-    ScrollbarMode verticalScrollbarMode() const { ScrollbarMode horizontal, vertical; scrollbarModes(horizontal, vertical); return vertical; }
-
-    void setHorizontalScrollbarLock(bool lock = true) { m_horizontalScrollbarLock = lock; }
-    bool horizontalScrollbarLock() const { return m_horizontalScrollbarLock; }
-    void setVerticalScrollbarLock(bool lock = true) { m_verticalScrollbarLock = lock; }
-    bool verticalScrollbarLock() const { return m_verticalScrollbarLock; }
-
-    void setScrollingModesLock(bool lock = true) { m_horizontalScrollbarLock = m_verticalScrollbarLock = lock; }
-
-    virtual void setCanHaveScrollbars(bool);
-    bool canHaveScrollbars() const { return horizontalScrollbarMode() != ScrollbarAlwaysOff || verticalScrollbarMode() != ScrollbarAlwaysOff; }
-
-    // By default you only receive paint events for the area that is visible. In the case of using a
-    // tiled backing store, this function can be set, so that the view paints the entire contents.
-    bool paintsEntireContents() const { return m_paintsEntireContents; }
-    void setPaintsEntireContents(bool);
-
-    // By default, paint events are clipped to the visible area.  If set to
-    // false, paint events are no longer clipped.  paintsEntireContents() implies !clipsRepaints().
-    bool clipsRepaints() const { return m_clipsRepaints; }
-    void setClipsRepaints(bool);
-
-    // Overridden by FrameView to create custom CSS scrollbars if applicable.
-    virtual PassRefPtr<Scrollbar> createScrollbar(ScrollbarOrientation);
-
-    // Whether or not a scroll view will blit visible contents when it is scrolled. Blitting is disabled in situations
-    // where it would cause rendering glitches (such as with fixed backgrounds or when the view is partially transparent).
-    void setCanBlitOnScroll(bool);
-    bool canBlitOnScroll() const;
-
-    // The visible content rect has a location that is the scrolled offset of the document. The width and height are the viewport width
-    // and height. By default the scrollbars themselves are excluded from this rectangle, but an optional boolean argument allows them to be
-    // included.
-    virtual IntRect visibleContentRect(IncludeScrollbarsInRect = ExcludeScrollbars) const OVERRIDE;
-    IntSize visibleSize() const { return visibleContentRect().size(); }
-    virtual int visibleWidth() const OVERRIDE { return visibleContentRect().width(); }
-    virtual int visibleHeight() const OVERRIDE { return visibleContentRect().height(); }
-
-    // visibleContentRect().size() is computed from unscaledVisibleContentSize() divided by the value of visibleContentScaleFactor.
-    // For the main frame, visibleContentScaleFactor is equal to the page's pageScaleFactor; it's 1 otherwise.
-    IntSize unscaledVisibleContentSize(IncludeScrollbarsInRect = ExcludeScrollbars) const;
-    virtual float visibleContentScaleFactor() const { return 1; }
-
-    // Offset used to convert incoming input events while emulating device metics.
-    virtual IntSize inputEventsOffsetForEmulation() const { return IntSize(); }
-
-    // Scale used to convert incoming input events. Usually the same as visibleContentScaleFactor(), unless specifically changed.
-    virtual float inputEventsScaleFactor() const { return visibleContentScaleFactor(); }
-
-    // Functions for getting/setting the size of the document contained inside the ScrollView (as an IntSize or as individual width and height
-    // values).
-    virtual IntSize contentsSize() const OVERRIDE; // Always at least as big as the visibleWidth()/visibleHeight().
-    int contentsWidth() const { return contentsSize().width(); }
-    int contentsHeight() const { return contentsSize().height(); }
-    virtual void setContentsSize(const IntSize&);
-
-    // Functions for querying the current scrolled position (both as a point, a size, or as individual X and Y values).
-    virtual IntPoint scrollPosition() const OVERRIDE { return visibleContentRect().location(); }
-    IntSize scrollOffset() const { return toIntSize(visibleContentRect().location()); } // Gets the scrolled position as an IntSize. Convenient for adding to other sizes.
-    virtual IntPoint maximumScrollPosition() const OVERRIDE; // The maximum position we can be scrolled to.
-    virtual IntPoint minimumScrollPosition() const OVERRIDE; // The minimum position we can be scrolled to.
-    // Adjust the passed in scroll position to keep it between the minimum and maximum positions.
-    IntPoint adjustScrollPositionWithinRange(const IntPoint&) const;
-    int scrollX() const { return scrollPosition().x(); }
-    int scrollY() const { return scrollPosition().y(); }
-
-    virtual IntSize overhangAmount() const OVERRIDE;
-
-    void cacheCurrentScrollPosition() { m_cachedScrollPosition = scrollPosition(); }
-    IntPoint cachedScrollPosition() const { return m_cachedScrollPosition; }
-
-    // Functions for scrolling the view.
-    virtual void setScrollPosition(const IntPoint&);
-    void scrollBy(const IntSize& s) { return setScrollPosition(scrollPosition() + s); }
-
-    // A logical scroll that just ends up calling the corresponding physical scroll() based off the document's writing mode.
-    bool logicalScroll(ScrollLogicalDirection, ScrollGranularity);
-
-    // Scroll the actual contents of the view (either blitting or invalidating as needed).
-    void scrollContents(const IntSize& scrollDelta);
-
-    // This gives us a means of blocking painting on our scrollbars until the first layout has occurred.
-    void setScrollbarsSuppressed(bool suppressed, bool repaintOnUnsuppress = false);
-    bool scrollbarsSuppressed() const { return m_scrollbarsSuppressed; }
-
-    IntPoint rootViewToContents(const IntPoint&) const;
-    IntPoint contentsToRootView(const IntPoint&) const;
-    IntRect rootViewToContents(const IntRect&) const;
-    IntRect contentsToRootView(const IntRect&) const;
-
-    // Event coordinates are assumed to be in the coordinate space of a window that contains
-    // the entire widget hierarchy. It is up to the platform to decide what the precise definition
-    // of containing window is. (For example on Mac it is the containing NSWindow.)
-    IntPoint windowToContents(const IntPoint&) const;
-    IntPoint contentsToWindow(const IntPoint&) const;
-    IntRect windowToContents(const IntRect&) const;
-    IntRect contentsToWindow(const IntRect&) const;
-
-    // Functions for converting to and from screen coordinates.
-    IntRect contentsToScreen(const IntRect&) const;
-    IntPoint screenToContents(const IntPoint&) const;
-
-    // The purpose of this function is to answer whether or not the scroll view is currently visible. Animations and painting updates can be suspended if
-    // we know that we are either not in a window right now or if that window is not visible.
-    bool isOffscreen() const;
-
-    // These functions are used to enable scrollbars to avoid window resizer controls that overlap the scroll view. This happens on Mac
-    // for example.
-    virtual IntRect windowResizerRect() const { return IntRect(); }
-    bool containsScrollbarsAvoidingResizer() const;
-    void adjustScrollbarsAvoidingResizerCount(int overlapDelta);
-    void windowResizerRectChanged();
-
-    virtual void setParent(Widget*) OVERRIDE; // Overridden to update the overlapping scrollbar count.
-
-    // Called when our frame rect changes (or the rect/scroll position of an ancestor changes).
-    virtual void frameRectsChanged();
-
-    // Widget override to update our scrollbars and notify our contents of the resize.
-    virtual void setFrameRect(const IntRect&);
-
-    // Widget override to notify our contents of a cliprect change.
-    virtual void clipRectChanged() OVERRIDE;
-
-    // For platforms that need to hit test scrollbars from within the engine's event handlers (like Win32).
-    Scrollbar* scrollbarAtPoint(const IntPoint& windowPoint);
-
-    virtual IntPoint convertChildToSelf(const Widget* child, const IntPoint& point) const
-    {
-        IntPoint newPoint = point;
-        if (!isScrollViewScrollbar(child))
-            newPoint = point - scrollOffset();
-        newPoint.moveBy(child->location());
-        return newPoint;
-    }
-
-    virtual IntPoint convertSelfToChild(const Widget* child, const IntPoint& point) const
-    {
-        IntPoint newPoint = point;
-        if (!isScrollViewScrollbar(child))
-            newPoint = point + scrollOffset();
-        newPoint.moveBy(-child->location());
-        return newPoint;
-    }
-
-    // Widget override. Handles painting of the contents of the view as well as the scrollbars.
-    virtual void paint(GraphicsContext*, const IntRect&);
-    void paintScrollbars(GraphicsContext*, const IntRect&);
-
-    // Widget overrides to ensure that our children's visibility status is kept up to date when we get shown and hidden.
-    virtual void show();
-    virtual void hide();
-    virtual void setParentVisible(bool);
-
-    // Pan scrolling.
-    static const int noPanScrollRadius = 15;
-    void addPanScrollIcon(const IntPoint&);
-    void removePanScrollIcon();
-    void paintPanScrollIcon(GraphicsContext*);
-
-    virtual bool isPointInScrollbarCorner(const IntPoint&);
-    virtual bool scrollbarCornerPresent() const;
-    virtual IntRect scrollCornerRect() const;
-    virtual void paintScrollCorner(GraphicsContext*, const IntRect& cornerRect);
-    virtual void paintScrollbar(GraphicsContext*, Scrollbar*, const IntRect&);
-
-    virtual IntRect convertFromScrollbarToContainingView(const Scrollbar*, const IntRect&) const OVERRIDE;
-    virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar*, const IntRect&) const OVERRIDE;
-    virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar*, const IntPoint&) const OVERRIDE;
-    virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar*, const IntPoint&) const OVERRIDE;
-
-    void calculateAndPaintOverhangAreas(GraphicsContext*, const IntRect& dirtyRect);
-    void calculateAndPaintOverhangBackground(GraphicsContext*, const IntRect& dirtyRect);
-
-    virtual bool isScrollView() const OVERRIDE { return true; }
-
-protected:
-    ScrollView();
-
-    virtual void repaintContentRectangle(const IntRect&);
-    virtual void paintContents(GraphicsContext*, const IntRect& damageRect) = 0;
-
-    virtual void paintOverhangAreas(GraphicsContext*, const IntRect& horizontalOverhangArea, const IntRect& verticalOverhangArea, const IntRect& dirtyRect);
-
-    virtual void scrollbarExistenceDidChange() = 0;
-    // These functions are used to create/destroy scrollbars.
-    void setHasHorizontalScrollbar(bool);
-    void setHasVerticalScrollbar(bool);
-
-    virtual void updateScrollCorner();
-    virtual void invalidateScrollCornerRect(const IntRect&) OVERRIDE;
-
-    // Scroll the content by blitting the pixels.
-    virtual bool scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect);
-    // Scroll the content by invalidating everything.
-    virtual void scrollContentsSlowPath(const IntRect& updateRect);
-
-    void setScrollOrigin(const IntPoint&, bool updatePositionAtAll, bool updatePositionSynchronously);
-
-    // Subclassed by FrameView to check the writing-mode of the document.
-    virtual bool isVerticalDocument() const { return true; }
-    virtual bool isFlippedDocument() const { return false; }
-
-    // Called to update the scrollbars to accurately reflect the state of the view.
-    void updateScrollbars(const IntSize& desiredOffset);
-
-    IntSize excludeScrollbars(const IntSize&) const;
-
-private:
-    RefPtr<Scrollbar> m_horizontalScrollbar;
-    RefPtr<Scrollbar> m_verticalScrollbar;
-    ScrollbarMode m_horizontalScrollbarMode;
-    ScrollbarMode m_verticalScrollbarMode;
-
-    bool m_horizontalScrollbarLock;
-    bool m_verticalScrollbarLock;
-
-    HashSet<RefPtr<Widget> > m_children;
-
-    // This bool is unused on Mac OS because we directly ask the platform widget
-    // whether it is safe to blit on scroll.
-    bool m_canBlitOnScroll;
-
-    IntSize m_scrollOffset; // FIXME: Would rather store this as a position, but we will wait to make this change until more code is shared.
-    IntPoint m_cachedScrollPosition;
-    IntSize m_contentsSize;
-
-    int m_scrollbarsAvoidingResizer;
-    bool m_scrollbarsSuppressed;
-
-    bool m_inUpdateScrollbars;
-    unsigned m_updateScrollbarsPass;
-
-    IntPoint m_panScrollIconPoint;
-    bool m_drawPanScrollIcon;
-
-    bool m_paintsEntireContents;
-    bool m_clipsRepaints;
-
-    void init();
-    void destroy();
-
-    IntRect rectToCopyOnScroll() const;
-
-    // Called when the scroll position within this view changes.  FrameView overrides this to generate repaint invalidations.
-    virtual void repaintFixedElementsAfterScrolling() { }
-    virtual void updateFixedElementsAfterScrolling() { }
-
-    void calculateOverhangAreasForPainting(IntRect& horizontalOverhangRect, IntRect& verticalOverhangRect);
-    void updateOverhangAreas();
-
-    int pageStep(ScrollbarOrientation) const;
-}; // class ScrollView
-
-inline ScrollView* toScrollView(Widget* widget)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!widget || widget->isScrollView());
-    return static_cast<ScrollView*>(widget);
-}
-
-inline const ScrollView* toScrollView(const Widget* widget)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!widget || widget->isScrollView());
-    return static_cast<const ScrollView*>(widget);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toScrollView(const ScrollView*);
-
-} // namespace WebCore
-
-#endif // ScrollView_h