blob: c4aa592b55f5e4c01d53e189fcd13da5142b4b97 [file] [log] [blame]
/*
* Copyright (C) 2004-2018 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 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.
*/
#pragma once
#include "FloatRect.h"
#include "IntRect.h"
#include "Scrollbar.h"
#include "ScrollableArea.h"
#include "ScrollTypes.h"
#include "Widget.h"
#include <wtf/HashSet.h>
#include <wtf/WeakPtr.h>
#if PLATFORM(IOS_FAMILY)
OBJC_CLASS WAKScrollView;
OBJC_CLASS WAKView;
#ifndef NSScrollView
#define NSScrollView WAKScrollView
#endif
#ifndef NSView
#define NSView WAKView
#endif
#endif // PLATFORM(IOS_FAMILY)
#if PLATFORM(COCOA) && defined __OBJC__
@class NSScrollView;
@protocol WebCoreFrameScrollView;
#endif
namespace WebCore {
class HostWindow;
class LegacyTileCache;
class Scrollbar;
class ScrollView : public Widget, public ScrollableArea {
public:
virtual ~ScrollView();
using WeakValueType = Widget::WeakValueType;
using Widget::weakPtrFactory;
// ScrollableArea functions.
WEBCORE_EXPORT void setScrollOffset(const ScrollOffset&) final;
bool isScrollCornerVisible() const final;
void scrollbarStyleChanged(ScrollbarStyle, bool forceUpdate) override;
virtual void notifyPageThatContentAreaWillPaint() const;
IntPoint locationOfContents() const;
// NOTE: This should only be called by the overridden setScrollOffset from ScrollableArea.
virtual void scrollTo(const ScrollPosition&);
// 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() const = 0;
// Functions for child manipulation and inspection.
const HashSet<Ref<Widget>>& children() const { return m_children; }
WEBCORE_EXPORT virtual void addChild(Widget&);
WEBCORE_EXPORT 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.
Scrollbar* horizontalScrollbar() const final { return m_horizontalScrollbar.get(); }
Scrollbar* verticalScrollbar() const final { 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.
WEBCORE_EXPORT 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); };
WEBCORE_EXPORT void scrollbarModes(ScrollbarMode& horizontalMode, ScrollbarMode& verticalMode) const;
ScrollbarMode horizontalScrollbarMode() const final { ScrollbarMode horizontal, vertical; scrollbarModes(horizontal, vertical); return horizontal; }
ScrollbarMode verticalScrollbarMode() const final { 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; }
WEBCORE_EXPORT virtual void setCanHaveScrollbars(bool);
virtual bool avoidScrollbarCreation() const { return false; }
void setScrollbarOverlayStyle(ScrollbarOverlayStyle) final;
// 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; }
WEBCORE_EXPORT void setPaintsEntireContents(bool);
// By default programmatic scrolling is handled by WebCore and not by the UI application.
// In the case of using a tiled backing store, this mode can be set, so that the scroll requests
// are delegated to the UI application.
bool delegatesScrolling() const { return m_delegatesScrolling; }
WEBCORE_EXPORT void setDelegatesScrolling(bool);
bool delegatesPageScaling() const { return m_delegatesPageScaling; }
WEBCORE_EXPORT void setDelegatesPageScaling(bool);
// Overridden by FrameView to create custom CSS scrollbars if applicable.
virtual Ref<Scrollbar> createScrollbar(ScrollbarOrientation);
virtual void styleDidChange();
// If the prohibits scrolling flag is set, then all scrolling in the view (even programmatic scrolling) is turned off.
void setProhibitsScrolling(bool b) { m_prohibitsScrolling = b; }
bool prohibitsScrolling() const { return m_prohibitsScrolling; }
// 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;
// There are at least three types of contentInset. Usually we just care about WebCoreContentInset, which is the inset
// that is set on a Page that requires WebCore to move its layers to accomodate the inset. However, there are platform
// concepts that are similar on both iOS and Mac when there is a platformWidget(). Sometimes we need the Mac platform value
// for topContentInset, so when the TopContentInsetType is WebCoreOrPlatformContentInset, platformTopContentInset()
// will be returned instead of the value set on Page.
enum class TopContentInsetType { WebCoreContentInset, WebCoreOrPlatformContentInset };
virtual float topContentInset(TopContentInsetType = TopContentInsetType::WebCoreContentInset) const { return 0; }
// The visible content rect has a location that is the scrolled offset of the document. The width and height are the unobscured viewport
// width and height. By default the scrollbars themselves are excluded from this rectangle, but an optional boolean argument allows them
// to be included.
// In the situation the client is responsible for the scrolling (ie. with a tiled backing store) it is possible to use
// the setFixedVisibleContentRect instead for the mainframe, though this must be updated manually, e.g just before resuming the page
// which usually will happen when panning, pinching and rotation ends, or when scale or position are changed manually.
IntSize visibleSize() const final { return visibleContentRect(LegacyIOSDocumentVisibleRect).size(); }
#if USE(COORDINATED_GRAPHICS)
virtual void setFixedVisibleContentRect(const IntRect& visibleContentRect) { m_fixedVisibleContentRect = visibleContentRect; }
IntRect fixedVisibleContentRect() const { return m_fixedVisibleContentRect; }
#endif
// Parts of the document can be visible through transparent or blured UI widgets of the chrome. Those parts
// contribute to painting but not to the scrollable area.
// The unobscuredContentRect is the area that is not covered by UI elements.
WEBCORE_EXPORT IntRect unobscuredContentRect(VisibleContentRectIncludesScrollbars = ExcludeScrollbars) const;
#if PLATFORM(IOS_FAMILY)
IntRect unobscuredContentRectIncludingScrollbars() const { return unobscuredContentRect(IncludeScrollbars); }
#else
IntRect unobscuredContentRectIncludingScrollbars() const { return visibleContentRectIncludingScrollbars(); }
#endif
// This is the area that is partially or fully exposed, and may extend under overlapping UI elements.
WEBCORE_EXPORT FloatRect exposedContentRect() const;
// The given rects are only used if there is no platform widget.
WEBCORE_EXPORT void setExposedContentRect(const FloatRect&);
WEBCORE_EXPORT FloatSize unobscuredContentSize() const;
WEBCORE_EXPORT void setUnobscuredContentSize(const FloatSize&);
#if PLATFORM(IOS_FAMILY)
void setActualScrollPosition(const IntPoint&);
LegacyTileCache* legacyTileCache();
#endif
// Size available for view contents, including content inset areas. Not affected by zooming.
IntSize sizeForVisibleContent(VisibleContentRectIncludesScrollbars = ExcludeScrollbars) const;
// FIXME: remove this. It's only used for the incorrectly behaving ScrollView::unobscuredContentRectInternal().
virtual float visibleContentScaleFactor() const { return 1; }
// Functions for getting/setting the size webkit should use to layout the contents. By default this is the same as the visible
// content size. Explicitly setting a layout size value will cause webkit to layout the contents using this size instead.
WEBCORE_EXPORT IntSize layoutSize() const;
int layoutWidth() const { return layoutSize().width(); }
int layoutHeight() const { return layoutSize().height(); }
WEBCORE_EXPORT IntSize fixedLayoutSize() const;
WEBCORE_EXPORT void setFixedLayoutSize(const IntSize&);
WEBCORE_EXPORT bool useFixedLayout() const;
WEBCORE_EXPORT void setUseFixedLayout(bool enable);
// Functions for getting/setting the size of the document contained inside the ScrollView (as an IntSize or as individual width and height
// values).
WEBCORE_EXPORT IntSize contentsSize() const final; // 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).
ScrollPosition scrollPosition() const final { return visibleContentRect(LegacyIOSDocumentVisibleRect).location(); }
ScrollPosition maximumScrollPosition() const override; // The maximum position we can be scrolled to.
// Adjust the passed in scroll position to keep it between the minimum and maximum positions.
ScrollPosition adjustScrollPositionWithinRange(const ScrollPosition&) const;
int scrollX() const { return scrollPosition().x(); }
int scrollY() const { return scrollPosition().y(); }
// Scroll position used by web-exposed features (has legacy iOS behavior).
WEBCORE_EXPORT IntPoint contentsScrollPosition() const;
void setContentsScrollPosition(const IntPoint&);
#if PLATFORM(IOS_FAMILY)
int actualScrollX() const { return unobscuredContentRect().x(); }
int actualScrollY() const { return unobscuredContentRect().y(); }
// FIXME: maybe fix scrollPosition() on iOS to return the actual scroll position.
IntPoint actualScrollPosition() const { return unobscuredContentRect().location(); }
#endif
// scrollOffset() anchors its (0,0) point at the ScrollableArea's origin. When the Page has a
// header, the header is positioned at (0,0), ABOVE the start of the Document. So when a page with
// a header is pinned to the top, the scrollOffset() is (0,0), but the Document is actually at
// (0, -headerHeight()). documentScrollPositionRelativeToScrollableAreaOrigin() will return this
// version of the offset, which tracks the top of Document relative to where scrolling was achored.
ScrollPosition documentScrollPositionRelativeToScrollableAreaOrigin() const;
// scrollPostion() anchors its (0,0) point at the ScrollableArea's origin. The top of the scrolling
// layer does not represent the top of the view when there is a topContentInset. Additionally, as
// detailed above, the origin of the scrolling layer also does not necessarily correspond with the
// top of the document anyway, since there could also be header. documentScrollPositionRelativeToViewOrigin()
// will return a version of the current scroll offset which tracks the top of the Document
// relative to the very top of the view.
WEBCORE_EXPORT ScrollPosition documentScrollPositionRelativeToViewOrigin() const;
IntSize overhangAmount() const final;
void cacheCurrentScrollPosition() { m_cachedScrollPosition = scrollPosition(); }
ScrollPosition cachedScrollPosition() const { return m_cachedScrollPosition; }
// Functions for scrolling the view.
virtual void setScrollPosition(const ScrollPosition&);
void scrollBy(const IntSize& s) { return setScrollPosition(scrollPosition() + s); }
// This function scrolls by lines, pages or pixels.
bool scroll(ScrollDirection, ScrollGranularity);
// 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.
WEBCORE_EXPORT void setScrollbarsSuppressed(bool suppressed, bool repaintOnUnsuppress = false);
bool scrollbarsSuppressed() const { return m_scrollbarsSuppressed; }
WEBCORE_EXPORT IntPoint rootViewToContents(const IntPoint&) const;
WEBCORE_EXPORT IntPoint contentsToRootView(const IntPoint&) const;
WEBCORE_EXPORT FloatPoint contentsToRootView(const FloatPoint&) const;
WEBCORE_EXPORT IntRect rootViewToContents(const IntRect&) const;
WEBCORE_EXPORT IntRect contentsToRootView(const IntRect&) const;
WEBCORE_EXPORT FloatRect rootViewToContents(const FloatRect&) const;
WEBCORE_EXPORT FloatRect contentsToRootView(const FloatRect&) const;
IntPoint viewToContents(const IntPoint&) const;
IntPoint contentsToView(const IntPoint&) const;
FloatPoint viewToContents(const FloatPoint&) const;
FloatPoint contentsToView(const FloatPoint&) const;
IntRect viewToContents(IntRect) const;
IntRect contentsToView(IntRect) const;
FloatRect viewToContents(FloatRect) const;
FloatRect contentsToView(FloatRect) const;
IntPoint contentsToContainingViewContents(const IntPoint&) const;
IntRect contentsToContainingViewContents(IntRect) const;
WEBCORE_EXPORT IntPoint rootViewToTotalContents(const IntPoint&) 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.)
WEBCORE_EXPORT IntPoint windowToContents(const IntPoint&) const;
WEBCORE_EXPORT IntPoint contentsToWindow(const IntPoint&) const;
WEBCORE_EXPORT IntRect windowToContents(const IntRect&) const;
WEBCORE_EXPORT IntRect contentsToWindow(const IntRect&) const;
// Functions for converting to and from screen coordinates.
WEBCORE_EXPORT 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;
// Called when our frame rect changes (or the rect/scroll position of an ancestor changes).
void frameRectsChanged() final;
// Widget override to update our scrollbars and notify our contents of the resize.
void setFrameRect(const IntRect&) override;
// Widget override to notify our contents of a cliprect change.
void clipRectChanged() final;
// For platforms that need to hit test scrollbars from within the engine's event handlers (like Win32).
Scrollbar* scrollbarAtPoint(const IntPoint& windowPoint);
IntPoint convertChildToSelf(const Widget* child, const IntPoint& point) const
{
IntPoint newPoint = point;
if (!isScrollViewScrollbar(child))
newPoint = point - toIntSize(scrollPosition());
newPoint.moveBy(child->location());
return newPoint;
}
IntPoint convertSelfToChild(const Widget* child, const IntPoint& point) const
{
IntPoint newPoint = point;
if (!isScrollViewScrollbar(child))
newPoint = point + toIntSize(scrollPosition());
newPoint.moveBy(-child->location());
return newPoint;
}
// Widget override. Handles painting of the contents of the view as well as the scrollbars.
WEBCORE_EXPORT void paint(GraphicsContext&, const IntRect&, Widget::SecurityOriginPaintPolicy = SecurityOriginPaintPolicy::AnyOrigin) final;
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.
WEBCORE_EXPORT void show() override;
WEBCORE_EXPORT void hide() override;
WEBCORE_EXPORT void setParentVisible(bool) final;
// Pan scrolling.
static const int noPanScrollRadius = 15;
void addPanScrollIcon(const IntPoint&);
void removePanScrollIcon();
void paintPanScrollIcon(GraphicsContext&);
bool isPointInScrollbarCorner(const IntPoint&);
bool scrollbarCornerPresent() const;
IntRect scrollCornerRect() const final;
virtual void paintScrollCorner(GraphicsContext&, const IntRect& cornerRect);
virtual void paintScrollbar(GraphicsContext&, Scrollbar&, const IntRect&);
IntRect convertFromScrollbarToContainingView(const Scrollbar&, const IntRect&) const final;
IntRect convertFromContainingViewToScrollbar(const Scrollbar&, const IntRect&) const final;
IntPoint convertFromScrollbarToContainingView(const Scrollbar&, const IntPoint&) const final;
IntPoint convertFromContainingViewToScrollbar(const Scrollbar&, const IntPoint&) const final;
void calculateAndPaintOverhangAreas(GraphicsContext&, const IntRect& dirtyRect);
WEBCORE_EXPORT void scrollOffsetChangedViaPlatformWidget(const ScrollOffset& oldOffset, const ScrollOffset& newOffset);
void setAllowsUnclampedScrollPositionForTesting(bool allowsUnclampedScrollPosition) { m_allowsUnclampedScrollPosition = allowsUnclampedScrollPosition; }
bool allowsUnclampedScrollPosition() const { return m_allowsUnclampedScrollPosition; }
bool managesScrollbars() const;
protected:
ScrollView();
virtual void repaintContentRectangle(const IntRect&);
virtual void paintContents(GraphicsContext&, const IntRect& damageRect, SecurityOriginPaintPolicy = SecurityOriginPaintPolicy::AnyOrigin) = 0;
virtual void paintOverhangAreas(GraphicsContext&, const IntRect& horizontalOverhangArea, const IntRect& verticalOverhangArea, const IntRect& dirtyRect);
void availableContentSizeChanged(AvailableSizeChangeReason) override;
virtual void addedOrRemovedScrollbar() = 0;
virtual void delegatesScrollingDidChange() = 0;
// These functions are used to create/destroy scrollbars.
// They return true if the scrollbar was added or removed.
bool setHasHorizontalScrollbar(bool, bool* contentSizeAffected = nullptr);
bool setHasVerticalScrollbar(bool, bool* contentSizeAffected = nullptr);
virtual void updateScrollCorner() = 0;
void invalidateScrollCornerRect(const IntRect&) final;
// Scroll the content by blitting the pixels.
virtual bool scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect) = 0;
// 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 = 0;
virtual bool isFlippedDocument() const = 0;
// Called to update the scrollbars to accurately reflect the state of the view.
void updateScrollbars(const ScrollPosition& desiredPosition);
float platformTopContentInset() const;
void platformSetTopContentInset(float);
void handleDeferredScrollUpdateAfterContentSizeChange();
virtual bool shouldDeferScrollUpdateAfterContentSizeChange() = 0;
virtual void scrollOffsetChangedViaPlatformWidgetImpl(const ScrollOffset&, const ScrollOffset&) = 0;
virtual void unobscuredContentSizeChanged() = 0;
#if PLATFORM(COCOA) && defined __OBJC__
public:
WEBCORE_EXPORT NSView* documentView() const;
private:
NSScrollView<WebCoreFrameScrollView>* scrollView() const;
#endif
private:
// Size available for view contents, excluding content insets. Not affected by zooming.
IntSize sizeForUnobscuredContent(VisibleContentRectIncludesScrollbars = ExcludeScrollbars) const;
IntRect visibleContentRectInternal(VisibleContentRectIncludesScrollbars, VisibleContentRectBehavior) const final;
WEBCORE_EXPORT IntRect unobscuredContentRectInternal(VisibleContentRectIncludesScrollbars = ExcludeScrollbars) const;
void completeUpdatesAfterScrollTo(const IntSize& scrollDelta);
bool setHasScrollbarInternal(RefPtr<Scrollbar>&, ScrollbarOrientation, bool hasBar, bool* contentSizeAffected);
bool isScrollView() const final { return true; }
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 updateLayerPositionsAfterScrolling() = 0;
virtual void updateCompositingLayersAfterScrolling() = 0;
void platformAddChild(Widget*);
void platformRemoveChild(Widget*);
void platformSetScrollbarModes();
void platformScrollbarModes(ScrollbarMode& horizontal, ScrollbarMode& vertical) const;
void platformSetCanBlitOnScroll(bool);
bool platformCanBlitOnScroll() const;
IntRect platformVisibleContentRect(bool includeScrollbars) const;
IntSize platformVisibleContentSize(bool includeScrollbars) const;
IntRect platformVisibleContentRectIncludingObscuredArea(bool includeScrollbars) const;
IntSize platformVisibleContentSizeIncludingObscuredArea(bool includeScrollbars) const;
IntRect platformUnobscuredContentRect(VisibleContentRectIncludesScrollbars) const;
FloatRect platformExposedContentRect() const;
void platformSetContentsSize();
IntRect platformContentsToScreen(const IntRect&) const;
IntPoint platformScreenToContents(const IntPoint&) const;
void platformSetScrollPosition(const IntPoint&);
bool platformScroll(ScrollDirection, ScrollGranularity);
void platformSetScrollbarsSuppressed(bool repaintOnUnsuppress);
void platformRepaintContentRectangle(const IntRect&);
bool platformIsOffscreen() const;
void platformSetScrollbarOverlayStyle(ScrollbarOverlayStyle);
void platformSetScrollOrigin(const IntPoint&, bool updatePositionAtAll, bool updatePositionSynchronously);
void calculateOverhangAreasForPainting(IntRect& horizontalOverhangRect, IntRect& verticalOverhangRect);
void updateOverhangAreas();
HashSet<Ref<Widget>> m_children;
RefPtr<Scrollbar> m_horizontalScrollbar;
RefPtr<Scrollbar> m_verticalScrollbar;
ScrollbarMode m_horizontalScrollbarMode { ScrollbarAuto };
ScrollbarMode m_verticalScrollbarMode { ScrollbarAuto };
// FIXME: More things will move into here.
struct DelegatedScrollingGeometry {
FloatSize unobscuredContentSize;
FloatRect exposedContentRect;
};
Optional<DelegatedScrollingGeometry> m_delegatedScrollingGeometry;
#if USE(COORDINATED_GRAPHICS)
// FIXME: exposedContentRect is a very similar concept to fixedVisibleContentRect except it does not differentiate
// between exposed and unobscured areas. The two attributes should eventually be merged.
IntRect m_fixedVisibleContentRect;
#endif
ScrollPosition m_scrollPosition;
IntPoint m_cachedScrollPosition;
IntSize m_fixedLayoutSize;
IntSize m_contentsSize;
Optional<IntSize> m_deferredScrollDelta; // Needed for WebKit scrolling
Optional<std::pair<ScrollOffset, ScrollOffset>> m_deferredScrollOffsets; // Needed for platform widget scrolling
IntPoint m_panScrollIconPoint;
unsigned m_updateScrollbarsPass { 0 };
bool m_horizontalScrollbarLock { false };
bool m_verticalScrollbarLock { false };
bool m_prohibitsScrolling { false };
bool m_allowsUnclampedScrollPosition { false };
// 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 { true };
bool m_scrollbarsSuppressed { false };
bool m_inUpdateScrollbars { false };
bool m_drawPanScrollIcon { false };
bool m_useFixedLayout { false };
bool m_paintsEntireContents { false };
bool m_delegatesScrolling { false };
bool m_delegatesPageScaling { false };
}; // class ScrollView
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_WIDGET(ScrollView, isScrollView())