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LocalFrameView.h
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LocalFrameView.h
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/*
Copyright (C) 1997 Martin Jones (mjones@kde.org)
(C) 1998 Waldo Bastian (bastian@kde.org)
(C) 1998, 1999 Torben Weis (weis@kde.org)
(C) 1999 Lars Knoll (knoll@kde.org)
(C) 1999 Antti Koivisto (koivisto@kde.org)
Copyright (C) 2004-2019 Apple Inc. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#pragma once
#include "AdjustViewSizeOrNot.h"
#include "Color.h"
#include "FrameView.h"
#include "LayoutMilestone.h"
#include "LayoutRect.h"
#include "LocalFrameViewLayoutContext.h"
#include "Pagination.h"
#include "PaintPhase.h"
#include "RenderPtr.h"
#include "SimpleRange.h"
#include <memory>
#include <wtf/Forward.h>
#include <wtf/Function.h>
#include <wtf/HashSet.h>
#include <wtf/IsoMalloc.h>
#include <wtf/ListHashSet.h>
#include <wtf/OptionSet.h>
#include <wtf/WeakHashSet.h>
#include <wtf/text/WTFString.h>
namespace WTF {
class TextStream;
}
namespace WebCore {
class AXObjectCache;
class ContainerNode;
class Element;
class FloatSize;
class Frame;
class GraphicsContext;
class HTMLFrameOwnerElement;
class LocalFrame;
class Page;
class RegionContext;
class RenderBox;
class RenderElement;
class RenderEmbeddedObject;
class RenderLayer;
class RenderLayerModelObject;
class RenderObject;
class RenderScrollbarPart;
class RenderStyle;
class RenderView;
class RenderWidget;
class ScrollingCoordinator;
class ScrollAnchoringController;
class TiledBacking;
struct ScrollRectToVisibleOptions;
struct SimpleRange;
struct VelocityData;
enum class NullGraphicsContextPaintInvalidationReasons : uint8_t;
enum class StyleColorOptions : uint8_t;
enum class TiledBackingScrollability : uint8_t;
namespace Display {
class View;
}
Pagination::Mode paginationModeForRenderStyle(const RenderStyle&);
enum class LayoutViewportConstraint : bool { Unconstrained, ConstrainedToDocumentRect };
class LocalFrameView final : public FrameView {
WTF_MAKE_ISO_ALLOCATED(LocalFrameView);
public:
friend class Internals;
friend class LocalFrameViewLayoutContext;
friend class RenderView;
WEBCORE_EXPORT static Ref<LocalFrameView> create(LocalFrame&);
static Ref<LocalFrameView> create(LocalFrame&, const IntSize& initialSize);
virtual ~LocalFrameView();
HostWindow* hostWindow() const final;
WEBCORE_EXPORT void invalidateRect(const IntRect&) final;
void setFrameRect(const IntRect&) final;
Type viewType() const final { return Type::Local; }
// FIXME: This should return Frame. If it were a RemoteFrame, we would have a RemoteFrameView.
WEBCORE_EXPORT Frame& frame() const;
WEBCORE_EXPORT RenderView* renderView() const;
Display::View* existingDisplayView() const;
Display::View& displayView();
int mapFromLayoutToCSSUnits(LayoutUnit) const;
LayoutUnit mapFromCSSToLayoutUnits(int) const;
WEBCORE_EXPORT void setCanHaveScrollbars(bool) final;
WEBCORE_EXPORT void updateCanHaveScrollbars();
bool isVisibleToHitTesting() const final;
Ref<Scrollbar> createScrollbar(ScrollbarOrientation) final;
void setContentsSize(const IntSize&) final;
void updateContentsSize() final;
const LocalFrameViewLayoutContext& layoutContext() const { return m_layoutContext; }
LocalFrameViewLayoutContext& layoutContext() { return m_layoutContext; }
WEBCORE_EXPORT bool didFirstLayout() const;
WEBCORE_EXPORT bool needsLayout() const;
WEBCORE_EXPORT void setNeedsLayoutAfterViewConfigurationChange();
void setNeedsCompositingConfigurationUpdate();
void setNeedsCompositingGeometryUpdate();
void setDescendantsNeedUpdateBackingAndHierarchyTraversal();
WEBCORE_EXPORT void setViewportConstrainedObjectsNeedLayout();
WEBCORE_EXPORT bool renderedCharactersExceed(unsigned threshold);
void scheduleSelectionUpdate();
#if PLATFORM(IOS_FAMILY)
bool useCustomFixedPositionLayoutRect() const;
IntRect customFixedPositionLayoutRect() const { return m_customFixedPositionLayoutRect; }
WEBCORE_EXPORT void setCustomFixedPositionLayoutRect(const IntRect&);
bool updateFixedPositionLayoutRect();
WEBCORE_EXPORT void setCustomSizeForResizeEvent(IntSize);
WEBCORE_EXPORT void setScrollVelocity(const VelocityData&);
#else
bool useCustomFixedPositionLayoutRect() const { return false; }
#endif
void willRecalcStyle();
void styleAndRenderTreeDidChange() override;
bool updateCompositingLayersAfterStyleChange();
void updateCompositingLayersAfterLayout();
// Called when changes to the GraphicsLayer hierarchy have to be synchronized with
// content rendered via the normal painting path.
void setNeedsOneShotDrawingSynchronization();
WEBCORE_EXPORT GraphicsLayer* graphicsLayerForPlatformWidget(PlatformWidget);
WEBCORE_EXPORT GraphicsLayer* graphicsLayerForPageScale();
WEBCORE_EXPORT GraphicsLayer* graphicsLayerForScrolledContents();
#if HAVE(RUBBER_BANDING)
WEBCORE_EXPORT GraphicsLayer* graphicsLayerForTransientZoomShadow();
#endif
WEBCORE_EXPORT TiledBacking* tiledBacking() const;
WEBCORE_EXPORT ScrollingNodeID scrollingNodeID() const override;
ScrollableArea* scrollableAreaForScrollingNodeID(ScrollingNodeID) const;
bool usesAsyncScrolling() const final;
WEBCORE_EXPORT void enterCompositingMode();
WEBCORE_EXPORT bool isEnclosedInCompositingLayer() const;
// Only used with accelerated compositing, but outside the #ifdef to make linkage easier.
// Returns true if the flush was completed.
WEBCORE_EXPORT bool flushCompositingStateIncludingSubframes();
// Returns true when a paint with the PaintBehavior::FlattenCompositingLayers flag set gives
// a faithful representation of the content.
WEBCORE_EXPORT bool isSoftwareRenderable() const;
void setIsInWindow(bool);
void resetScrollbars();
void resetScrollbarsAndClearContentsSize();
void prepareForDetach();
void detachCustomScrollbars();
WEBCORE_EXPORT void recalculateScrollbarOverlayStyle();
#if ENABLE(DARK_MODE_CSS)
void recalculateBaseBackgroundColor();
#endif
void clear();
void resetLayoutMilestones();
WEBCORE_EXPORT bool isTransparent() const;
WEBCORE_EXPORT void setTransparent(bool isTransparent);
// True if the FrameView is not transparent, and the base background color is opaque.
bool hasOpaqueBackground() const;
WEBCORE_EXPORT Color baseBackgroundColor() const;
WEBCORE_EXPORT void setBaseBackgroundColor(const Color&);
WEBCORE_EXPORT void updateBackgroundRecursively(const std::optional<Color>& backgroundColor);
enum ExtendedBackgroundModeFlags {
ExtendedBackgroundModeNone = 0,
ExtendedBackgroundModeVertical = 1 << 0,
ExtendedBackgroundModeHorizontal = 1 << 1,
ExtendedBackgroundModeAll = ExtendedBackgroundModeVertical | ExtendedBackgroundModeHorizontal,
};
typedef unsigned ExtendedBackgroundMode;
void updateExtendBackgroundIfNecessary();
void updateTilesForExtendedBackgroundMode(ExtendedBackgroundMode);
ExtendedBackgroundMode calculateExtendedBackgroundMode() const;
bool hasExtendedBackgroundRectForPainting() const;
IntRect extendedBackgroundRectForPainting() const;
bool shouldUpdateWhileOffscreen() const;
WEBCORE_EXPORT void setShouldUpdateWhileOffscreen(bool);
bool shouldUpdate() const;
WEBCORE_EXPORT void adjustViewSize();
struct OverrideViewportSize {
std::optional<float> width;
std::optional<float> height;
bool operator==(const OverrideViewportSize& rhs) const { return rhs.width == width && rhs.height == height; }
};
WEBCORE_EXPORT void setOverrideSizeForCSSDefaultViewportUnits(OverrideViewportSize);
std::optional<OverrideViewportSize> overrideSizeForCSSDefaultViewportUnits() const { return m_defaultViewportSizeOverride; }
WEBCORE_EXPORT void setSizeForCSSDefaultViewportUnits(FloatSize);
void clearSizeOverrideForCSSDefaultViewportUnits();
FloatSize sizeForCSSDefaultViewportUnits() const;
WEBCORE_EXPORT void setOverrideSizeForCSSSmallViewportUnits(OverrideViewportSize);
std::optional<OverrideViewportSize> overrideSizeForCSSSmallViewportUnits() const { return m_smallViewportSizeOverride; }
WEBCORE_EXPORT void setSizeForCSSSmallViewportUnits(FloatSize);
void clearSizeOverrideForCSSSmallViewportUnits();
FloatSize sizeForCSSSmallViewportUnits() const;
WEBCORE_EXPORT void setOverrideSizeForCSSLargeViewportUnits(OverrideViewportSize);
std::optional<OverrideViewportSize> overrideSizeForCSSLargeViewportUnits() const { return m_largeViewportSizeOverride; }
WEBCORE_EXPORT void setSizeForCSSLargeViewportUnits(FloatSize);
void clearSizeOverrideForCSSLargeViewportUnits();
FloatSize sizeForCSSLargeViewportUnits() const;
FloatSize sizeForCSSDynamicViewportUnits() const;
IntRect windowClipRect() const final;
WEBCORE_EXPORT IntRect windowClipRectForFrameOwner(const HTMLFrameOwnerElement*, bool clipToLayerContents) const;
float visibleContentScaleFactor() const final;
#if USE(COORDINATED_GRAPHICS)
WEBCORE_EXPORT void setFixedVisibleContentRect(const IntRect&) final;
#endif
WEBCORE_EXPORT void setScrollPosition(const ScrollPosition&, const ScrollPositionChangeOptions& = ScrollPositionChangeOptions::createProgrammatic()) final;
void restoreScrollbar();
void scheduleScrollToFocusedElement(SelectionRevealMode);
void cancelScheduledScrolls();
void scrollToFocusedElementImmediatelyIfNeeded();
void updateLayerPositionsAfterScrolling() final;
void updateCompositingLayersAfterScrolling() final;
static WEBCORE_EXPORT bool scrollRectToVisible(const LayoutRect& absoluteRect, const RenderObject&, bool insideFixed, const ScrollRectToVisibleOptions&);
bool requestStartKeyboardScrollAnimation(const KeyboardScroll&) final;
bool requestStopKeyboardScrollAnimation(bool immediate) final;
bool requestScrollPositionUpdate(const ScrollPosition&, ScrollType = ScrollType::User, ScrollClamping = ScrollClamping::Clamped) final;
bool requestAnimatedScrollToPosition(const ScrollPosition&, ScrollClamping = ScrollClamping::Clamped) final;
void stopAsyncAnimatedScroll() final;
bool isUserScrollInProgress() const final;
bool isRubberBandInProgress() const final;
WEBCORE_EXPORT ScrollPosition minimumScrollPosition() const final;
WEBCORE_EXPORT ScrollPosition maximumScrollPosition() const final;
// The scrollOrigin, scrollPosition, minimumScrollPosition and maximumScrollPosition are all affected by frame scale,
// but layoutViewport computations require unscaled scroll positions.
ScrollPosition unscaledMinimumScrollPosition() const;
ScrollPosition unscaledMaximumScrollPosition() const;
IntPoint unscaledScrollOrigin() const;
WEBCORE_EXPORT LayoutPoint minStableLayoutViewportOrigin() const;
WEBCORE_EXPORT LayoutPoint maxStableLayoutViewportOrigin() const;
enum class TriggerLayoutOrNot : bool { No, Yes };
// This origin can be overridden by setLayoutViewportOverrideRect.
void setBaseLayoutViewportOrigin(LayoutPoint, TriggerLayoutOrNot = TriggerLayoutOrNot::Yes);
// This size can be overridden by setLayoutViewportOverrideRect.
WEBCORE_EXPORT LayoutSize baseLayoutViewportSize() const;
// If set, overrides the default "m_layoutViewportOrigin, size of initial containing block" rect.
// Used with delegated scrolling (i.e. iOS).
WEBCORE_EXPORT void setLayoutViewportOverrideRect(std::optional<LayoutRect>, TriggerLayoutOrNot = TriggerLayoutOrNot::Yes);
std::optional<LayoutRect> layoutViewportOverrideRect() const { return m_layoutViewportOverrideRect; }
WEBCORE_EXPORT void setVisualViewportOverrideRect(std::optional<LayoutRect>);
std::optional<LayoutRect> visualViewportOverrideRect() const { return m_visualViewportOverrideRect; }
// These are in document coordinates, unaffected by page scale (but affected by zooming).
WEBCORE_EXPORT LayoutRect layoutViewportRect() const;
WEBCORE_EXPORT LayoutRect visualViewportRect() const;
static LayoutRect visibleDocumentRect(const FloatRect& visibleContentRect, float headerHeight, float footerHeight, const FloatSize& totalContentsSize, float pageScaleFactor);
// This is different than visibleContentRect() in that it ignores negative (or overly positive)
// offsets from rubber-banding, and it takes zooming into account.
LayoutRect viewportConstrainedVisibleContentRect() const;
WEBCORE_EXPORT void layoutOrVisualViewportChanged();
LayoutRect rectForFixedPositionLayout() const;
void viewportContentsChanged();
WEBCORE_EXPORT void resumeVisibleImageAnimationsIncludingSubframes();
#if ENABLE(ACCESSIBILITY_ANIMATION_CONTROL)
void updatePlayStateForAllAnimationsIncludingSubframes();
#endif
AtomString mediaType() const;
WEBCORE_EXPORT void setMediaType(const AtomString&);
void adjustMediaTypeForPrinting(bool printing);
void setCannotBlitToWindow();
void setIsOverlapped(bool);
void setContentIsOpaque(bool);
void addSlowRepaintObject(RenderElement&);
void removeSlowRepaintObject(RenderElement&);
bool hasSlowRepaintObject(const RenderElement& renderer) const;
bool hasSlowRepaintObjects() const;
WeakHashSet<RenderElement>* slowRepaintObjects() const { return m_slowRepaintObjects.get(); }
// Includes fixed- and sticky-position objects.
void addViewportConstrainedObject(RenderLayerModelObject&);
void removeViewportConstrainedObject(RenderLayerModelObject&);
const WeakHashSet<RenderLayerModelObject>* viewportConstrainedObjects() const { return m_viewportConstrainedObjects.get(); }
WEBCORE_EXPORT bool hasViewportConstrainedObjects() const;
float frameScaleFactor() const;
// Functions for querying the current scrolled position, negating the effects of overhang
// and adjusting for page scale.
LayoutPoint scrollPositionForFixedPosition() const;
// Static function can be called from another thread.
WEBCORE_EXPORT static LayoutPoint scrollPositionForFixedPosition(const LayoutRect& visibleContentRect, const LayoutSize& totalContentsSize, const LayoutPoint& scrollPosition, const LayoutPoint& scrollOrigin, float frameScaleFactor, bool fixedElementsLayoutRelativeToFrame, ScrollBehaviorForFixedElements, int headerHeight, int footerHeight);
WEBCORE_EXPORT static LayoutSize expandedLayoutViewportSize(const LayoutSize& baseLayoutViewportSize, const LayoutSize& documentSize, double heightExpansionFactor);
WEBCORE_EXPORT static LayoutRect computeUpdatedLayoutViewportRect(const LayoutRect& layoutViewport, const LayoutRect& documentRect, const LayoutSize& unobscuredContentSize, const LayoutRect& unobscuredContentRect, const LayoutSize& baseLayoutViewportSize, const LayoutPoint& stableLayoutViewportOriginMin, const LayoutPoint& stableLayoutViewportOriginMax, LayoutViewportConstraint);
WEBCORE_EXPORT static LayoutPoint computeLayoutViewportOrigin(const LayoutRect& visualViewport, const LayoutPoint& stableLayoutViewportOriginMin, const LayoutPoint& stableLayoutViewportOriginMax, const LayoutRect& layoutViewport, ScrollBehaviorForFixedElements);
// These layers are positioned differently when there is a topContentInset, a header, or a footer. These value need to be computed
// on both the main thread and the scrolling thread.
static float yPositionForInsetClipLayer(const FloatPoint& scrollPosition, float topContentInset);
WEBCORE_EXPORT static FloatPoint positionForRootContentLayer(const FloatPoint& scrollPosition, const FloatPoint& scrollOrigin, float topContentInset, float headerHeight);
WEBCORE_EXPORT FloatPoint positionForRootContentLayer() const;
WEBCORE_EXPORT static float yPositionForHeaderLayer(const FloatPoint& scrollPosition, float topContentInset);
WEBCORE_EXPORT static float yPositionForFooterLayer(const FloatPoint& scrollPosition, float topContentInset, float totalContentsHeight, float footerHeight);
#if PLATFORM(IOS_FAMILY)
WEBCORE_EXPORT LayoutRect viewportConstrainedObjectsRect() const;
// Static function can be called from another thread.
WEBCORE_EXPORT static LayoutRect rectForViewportConstrainedObjects(const LayoutRect& visibleContentRect, const LayoutSize& totalContentsSize, float frameScaleFactor, bool fixedElementsLayoutRelativeToFrame, ScrollBehaviorForFixedElements);
#endif
IntRect viewRectExpandedByContentInsets() const;
bool fixedElementsLayoutRelativeToFrame() const;
bool speculativeTilingEnabled() const { return m_speculativeTilingEnabled; }
void loadProgressingStatusChanged();
WEBCORE_EXPORT void updateControlTints();
WEBCORE_EXPORT bool wasScrolledByUser() const;
WEBCORE_EXPORT void setWasScrolledByUser(bool);
bool safeToPropagateScrollToParent() const;
void addEmbeddedObjectToUpdate(RenderEmbeddedObject&);
void removeEmbeddedObjectToUpdate(RenderEmbeddedObject&);
WEBCORE_EXPORT void paintContents(GraphicsContext&, const IntRect& dirtyRect, SecurityOriginPaintPolicy = SecurityOriginPaintPolicy::AnyOrigin, RegionContext* = nullptr) final;
struct PaintingState {
OptionSet<PaintBehavior> paintBehavior;
bool isTopLevelPainter;
bool isFlatteningPaintOfRootFrame;
PaintingState()
: paintBehavior()
, isTopLevelPainter(false)
, isFlatteningPaintOfRootFrame(false)
{
}
};
void willPaintContents(GraphicsContext&, const IntRect& dirtyRect, PaintingState&, RegionContext* = nullptr);
void didPaintContents(GraphicsContext&, const IntRect& dirtyRect, PaintingState&);
#if PLATFORM(IOS_FAMILY)
WEBCORE_EXPORT void didReplaceMultipartContent();
#endif
WEBCORE_EXPORT void setPaintBehavior(OptionSet<PaintBehavior>);
WEBCORE_EXPORT OptionSet<PaintBehavior> paintBehavior() const;
bool isPainting() const;
bool hasEverPainted() const { return !!m_lastPaintTime; }
void setLastPaintTime(MonotonicTime lastPaintTime) { m_lastPaintTime = lastPaintTime; }
WEBCORE_EXPORT void setNodeToDraw(Node*);
enum SelectionInSnapshot { IncludeSelection, ExcludeSelection };
enum CoordinateSpaceForSnapshot { DocumentCoordinates, ViewCoordinates };
WEBCORE_EXPORT void paintContentsForSnapshot(GraphicsContext&, const IntRect& imageRect, SelectionInSnapshot shouldPaintSelection, CoordinateSpaceForSnapshot);
void paintOverhangAreas(GraphicsContext&, const IntRect& horizontalOverhangArea, const IntRect& verticalOverhangArea, const IntRect& dirtyRect) final;
void paintScrollCorner(GraphicsContext&, const IntRect& cornerRect) final;
void paintScrollbar(GraphicsContext&, Scrollbar&, const IntRect&) final;
WEBCORE_EXPORT Color documentBackgroundColor() const;
static MonotonicTime currentPaintTimeStamp() { return sCurrentPaintTimeStamp; } // returns 0 if not painting
WEBCORE_EXPORT void updateLayoutAndStyleIfNeededRecursive();
void incrementVisuallyNonEmptyCharacterCount(const String&);
void incrementVisuallyNonEmptyPixelCount(const IntSize&);
bool isVisuallyNonEmpty() const { return m_contentQualifiesAsVisuallyNonEmpty; }
bool hasContentfulDescendants() const;
void checkAndDispatchDidReachVisuallyNonEmptyState();
WEBCORE_EXPORT void enableFixedWidthAutoSizeMode(bool enable, const IntSize& minSize);
WEBCORE_EXPORT void enableSizeToContentAutoSizeMode(bool enable, const IntSize& maxSize);
WEBCORE_EXPORT void setAutoSizeFixedMinimumHeight(int);
bool isFixedWidthAutoSizeEnabled() const { return m_shouldAutoSize && m_autoSizeMode == AutoSizeMode::FixedWidth; }
bool isSizeToContentAutoSizeEnabled() const { return m_shouldAutoSize && m_autoSizeMode == AutoSizeMode::SizeToContent; }
IntSize autoSizingIntrinsicContentSize() const { return m_autoSizeContentSize; }
WEBCORE_EXPORT void forceLayout(bool allowSubtreeLayout = false);
WEBCORE_EXPORT void forceLayoutForPagination(const FloatSize& pageSize, const FloatSize& originalPageSize, float maximumShrinkFactor, AdjustViewSizeOrNot);
// FIXME: This method is retained because of embedded WebViews in AppKit. When a WebView is embedded inside
// some enclosing view with auto-pagination, no call happens to resize the view. The new pagination model
// needs the view to resize as a result of the breaks, but that means that the enclosing view has to potentially
// resize around that view. Auto-pagination uses the bounds of the actual view that's being printed to determine
// the edges of the print operation, so the resize is necessary if the enclosing view's bounds depend on the
// web document's bounds.
//
// This is already a problem if the view needs to be a different size because of printer fonts or because of print stylesheets.
// Mail/Dictionary work around this problem by using the _layoutForPrinting SPI
// to at least get print stylesheets and printer fonts into play, but since WebKit doesn't know about the page offset or
// page size, it can't actually paginate correctly during _layoutForPrinting.
//
// We can eventually move Mail to a newer SPI that would let them opt in to the layout-time pagination model,
// but that doesn't solve the general problem of how other AppKit views could opt in to the better model.
//
// NO OTHER PLATFORM BESIDES MAC SHOULD USE THIS METHOD.
WEBCORE_EXPORT void adjustPageHeightDeprecated(float* newBottom, float oldTop, float oldBottom, float bottomLimit);
bool scrollToFragment(const URL&);
void maintainScrollPositionAtAnchor(ContainerNode*);
void maintainScrollPositionAtScrollToTextFragmentRange(SimpleRange&);
WEBCORE_EXPORT void scrollElementToRect(const Element&, const IntRect&);
// Coordinate systems:
//
// "View"
// Top left is top left of the FrameView/ScrollView/Widget. Size is Widget::boundsRect().size().
//
// "TotalContents"
// Relative to ScrollView's scrolled contents, including headers and footers. Size is totalContentsSize().
//
// "Contents"
// Relative to ScrollView's scrolled contents, excluding headers and footers, so top left is top left of the scroll view's
// document, and size is contentsSize().
//
// "Absolute"
// Relative to the document's scroll origin (non-zero for RTL documents), but affected by page zoom and page scale. Mostly used
// in rendering code.
//
// "Document"
// Relative to the document's scroll origin, but not affected by page zoom or page scale. Size is equivalent to CSS pixel dimensions.
// FIXME: some uses are affected by page zoom (e.g. layout and visual viewports).
//
// "Client"
// Relative to the visible part of the document (or, more strictly, the layout viewport rect), and with the same scaling
// as Document coordinates, i.e. matching CSS pixels. Affected by scroll origin.
//
// "LayoutViewport"
// Similar to client coordinates, but affected by page zoom (but not page scale).
//
// Methods to convert points and rects between the coordinate space of the renderer, and this view.
WEBCORE_EXPORT IntRect convertFromRendererToContainingView(const RenderElement*, const IntRect&) const;
WEBCORE_EXPORT IntRect convertFromContainingViewToRenderer(const RenderElement*, const IntRect&) const;
WEBCORE_EXPORT FloatRect convertFromContainingViewToRenderer(const RenderElement*, const FloatRect&) const;
WEBCORE_EXPORT IntPoint convertFromRendererToContainingView(const RenderElement*, const IntPoint&) const;
WEBCORE_EXPORT FloatPoint convertFromRendererToContainingView(const RenderElement*, const FloatPoint&) const;
WEBCORE_EXPORT IntPoint convertFromContainingViewToRenderer(const RenderElement*, const IntPoint&) const;
// Override ScrollView methods to do point conversion via renderers, in order to take transforms into account.
IntRect convertToContainingView(const IntRect&) const final;
IntRect convertFromContainingView(const IntRect&) const final;
FloatRect convertFromContainingView(const FloatRect&) const final;
IntPoint convertToContainingView(const IntPoint&) const final;
FloatPoint convertToContainingView(const FloatPoint&) const final;
IntPoint convertFromContainingView(const IntPoint&) const final;
float documentToAbsoluteScaleFactor(std::optional<float> effectiveZoom = std::nullopt) const;
float absoluteToDocumentScaleFactor(std::optional<float> effectiveZoom = std::nullopt) const;
WEBCORE_EXPORT FloatRect absoluteToDocumentRect(FloatRect, std::optional<float> effectiveZoom = std::nullopt) const;
WEBCORE_EXPORT FloatPoint absoluteToDocumentPoint(FloatPoint, std::optional<float> effectiveZoom = std::nullopt) const;
FloatRect absoluteToClientRect(FloatRect, std::optional<float> effectiveZoom = std::nullopt) const;
FloatSize documentToClientOffset() const;
WEBCORE_EXPORT FloatRect documentToClientRect(FloatRect) const;
FloatPoint documentToClientPoint(FloatPoint) const;
WEBCORE_EXPORT FloatRect clientToDocumentRect(FloatRect) const;
WEBCORE_EXPORT FloatPoint clientToDocumentPoint(FloatPoint) const;
WEBCORE_EXPORT FloatPoint absoluteToLayoutViewportPoint(FloatPoint) const;
FloatPoint layoutViewportToAbsolutePoint(FloatPoint) const;
WEBCORE_EXPORT FloatRect absoluteToLayoutViewportRect(FloatRect) const;
FloatRect layoutViewportToAbsoluteRect(FloatRect) const;
// Unlike client coordinates, layout viewport coordinates are affected by page zoom.
WEBCORE_EXPORT FloatRect clientToLayoutViewportRect(FloatRect) const;
WEBCORE_EXPORT FloatPoint clientToLayoutViewportPoint(FloatPoint) const;
bool isFrameViewScrollCorner(const RenderScrollbarPart& scrollCorner) const { return m_scrollCorner.get() == &scrollCorner; }
// isScrollable() takes an optional Scrollability parameter that allows the caller to define what they mean by 'scrollable.'
// Most callers are interested in the default value, Scrollability::Scrollable, which means that there is actually content
// to scroll to, and a scrollbar that will allow you to access it. In some cases, callers want to know if the FrameView is allowed
// to rubber-band, which the main frame might be allowed to do even if there is no content to scroll to. In that case,
// callers use Scrollability::ScrollableOrRubberbandable.
enum class Scrollability { Scrollable, ScrollableOrRubberbandable };
WEBCORE_EXPORT bool isScrollable(Scrollability definitionOfScrollable = Scrollability::Scrollable);
bool isScrollableOrRubberbandable() final;
bool hasScrollableOrRubberbandableAncestor() final;
enum ScrollbarModesCalculationStrategy { RulesFromWebContentOnly, AnyRule };
void calculateScrollbarModesForLayout(ScrollbarMode& hMode, ScrollbarMode& vMode, ScrollbarModesCalculationStrategy = AnyRule);
IntPoint lastKnownMousePositionInView() const final;
bool isHandlingWheelEvent() const final;
bool shouldSetCursor() const;
WEBCORE_EXPORT bool useDarkAppearance() const final;
OptionSet<StyleColorOptions> styleColorOptions() const;
// FIXME: Remove this method once plugin loading is decoupled from layout.
void flushAnyPendingPostLayoutTasks();
bool shouldSuspendScrollAnimations() const final;
void scrollbarStyleChanged(ScrollbarStyle, bool forceUpdate) override;
RenderBox* embeddedContentBox() const;
WEBCORE_EXPORT void setTracksRepaints(bool);
bool isTrackingRepaints() const { return m_isTrackingRepaints; }
WEBCORE_EXPORT void resetTrackedRepaints();
const Vector<FloatRect>& trackedRepaintRects() const { return m_trackedRepaintRects; }
String trackedRepaintRectsAsText() const;
typedef WeakHashSet<ScrollableArea> ScrollableAreaSet;
// Returns whether the scrollable area has just been newly added.
WEBCORE_EXPORT bool addScrollableArea(ScrollableArea*);
// Returns whether the scrollable area has just been removed.
WEBCORE_EXPORT bool removeScrollableArea(ScrollableArea*);
bool containsScrollableArea(ScrollableArea*) const;
const ScrollableAreaSet* scrollableAreas() const { return m_scrollableAreas.get(); }
void addScrollableAreaForAnimatedScroll(ScrollableArea*);
void removeScrollableAreaForAnimatedScroll(ScrollableArea*);
const ScrollableAreaSet* scrollableAreasForAnimatedScroll() const { return m_scrollableAreasForAnimatedScroll.get(); }
WEBCORE_EXPORT void addChild(Widget&) final;
WEBCORE_EXPORT void removeChild(Widget&) final;
// This function exists for ports that need to handle wheel events manually.
// On Mac WebKit1 the underlying NSScrollView just does the scrolling, but on most other platforms
// we need this function in order to do the scroll ourselves.
bool handleWheelEventForScrolling(const PlatformWheelEvent&, std::optional<WheelScrollGestureState>) final;
WEBCORE_EXPORT void setScrollingPerformanceTestingEnabled(bool);
// Page and LocalFrameView both store a Pagination value. Page::pagination() is set only by API,
// and LocalFrameView::pagination() is set only by CSS. Page::pagination() will affect all
// FrameViews in the back/forward cache, but LocalFrameView::pagination() only affects the current
// LocalFrameView. LocalFrameView::pagination() will return m_pagination if it has been set. Otherwise,
// it will return Page::pagination() since currently there are no callers that need to
// distinguish between the two.
const Pagination& pagination() const;
void setPagination(const Pagination&);
bool isActive() const final;
bool forceUpdateScrollbarsOnMainThreadForPerformanceTesting() const final;
#if HAVE(RUBBER_BANDING)
WEBCORE_EXPORT GraphicsLayer* setWantsLayerForTopOverHangArea(bool) const;
WEBCORE_EXPORT GraphicsLayer* setWantsLayerForBottomOverHangArea(bool) const;
#endif
// This function "smears" the "position:fixed" uninflatedBounds for scrolling, returning a rect that is the union of
// all possible locations of the given rect under page scrolling.
LayoutRect fixedScrollableAreaBoundsInflatedForScrolling(const LayoutRect& uninflatedBounds) const;
LayoutPoint scrollPositionRespectingCustomFixedPosition() const;
WEBCORE_EXPORT int headerHeight() const final;
WEBCORE_EXPORT int footerHeight() const final;
WEBCORE_EXPORT float topContentInset(TopContentInsetType = TopContentInsetType::WebCoreContentInset) const final;
void topContentInsetDidChange(float newTopContentInset);
void topContentDirectionDidChange();
WEBCORE_EXPORT void willStartLiveResize() final;
WEBCORE_EXPORT void willEndLiveResize() final;
WEBCORE_EXPORT void availableContentSizeChanged(AvailableSizeChangeReason) final;
void updateTiledBackingAdaptiveSizing();
OptionSet<TiledBackingScrollability> computeScrollability() const;
void addPaintPendingMilestones(OptionSet<LayoutMilestone>);
void firePaintRelatedMilestonesIfNeeded();
void fireLayoutRelatedMilestonesIfNeeded();
OptionSet<LayoutMilestone> milestonesPendingPaint() const { return m_milestonesPendingPaint; }
bool visualUpdatesAllowedByClient() const { return m_visualUpdatesAllowedByClient; }
WEBCORE_EXPORT void setVisualUpdatesAllowedByClient(bool);
WEBCORE_EXPORT void setScrollPinningBehavior(ScrollPinningBehavior);
ScrollBehaviorForFixedElements scrollBehaviorForFixedElements() const;
bool hasFlippedBlockRenderers() const { return m_hasFlippedBlockRenderers; }
void setHasFlippedBlockRenderers(bool b) { m_hasFlippedBlockRenderers = b; }
void updateWidgetPositions();
void scheduleUpdateWidgetPositions();
void didAddWidgetToRenderTree(Widget&);
void willRemoveWidgetFromRenderTree(Widget&);
const HashSet<Widget*>& widgetsInRenderTree() const { return m_widgetsInRenderTree; }
void notifyAllFramesThatContentAreaWillPaint() const;
void addTrackedRepaintRect(const FloatRect&);
// exposedRect represents WebKit's understanding of what part
// of the view is actually exposed on screen (taking into account
// clipping by other UI elements), whereas visibleContentRect is
// internal to WebCore and doesn't respect those things.
WEBCORE_EXPORT void setViewExposedRect(std::optional<FloatRect>);
std::optional<FloatRect> viewExposedRect() const { return m_viewExposedRect; }
void updateSnapOffsets() final;
bool isScrollSnapInProgress() const final;
void updateScrollingCoordinatorScrollSnapProperties() const;
float adjustVerticalPageScrollStepForFixedContent(float step) final;
void didChangeScrollOffset();
void show() final;
void hide() final;
bool shouldPlaceVerticalScrollbarOnLeft() const final;
void didRestoreFromBackForwardCache();
void willDestroyRenderTree();
void didDestroyRenderTree();
void setSpeculativeTilingDelayDisabledForTesting(bool disabled) { m_speculativeTilingDelayDisabledForTesting = disabled; }
WEBCORE_EXPORT void invalidateControlTints();
void invalidateImagesWithAsyncDecodes();
void updateAccessibilityObjectRegions();
AXObjectCache* axObjectCache() const;
void invalidateScrollbarsForAllScrollableAreas();
GraphicsLayer* layerForHorizontalScrollbar() const final;
GraphicsLayer* layerForVerticalScrollbar() const final;
void renderLayerDidScroll(const RenderLayer&);
void scrollToPositionWithAnimation(const ScrollPosition&, ScrollType = ScrollType::Programmatic, ScrollClamping = ScrollClamping::Clamped);
bool inUpdateEmbeddedObjects() const { return m_inUpdateEmbeddedObjects; }
String debugDescription() const final;
void willBeDestroyed() final;
// ScrollView
void updateScrollbarSteps() override;
OverscrollBehavior horizontalOverscrollBehavior() const final;
OverscrollBehavior verticalOverscrollBehavior() const final;
private:
explicit LocalFrameView(LocalFrame&);
bool scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect) final;
void scrollContentsSlowPath(const IntRect& updateRect) final;
void traverseForPaintInvalidation(NullGraphicsContextPaintInvalidationReasons);
void repaintSlowRepaintObjects();
bool isVerticalDocument() const final;
bool isFlippedDocument() const final;
void reset();
void init();
enum LayoutPhase {
OutsideLayout,
InPreLayout,
InRenderTreeLayout,
InViewSizeAdjust,
InPostLayout
};
bool isFrameView() const final { return true; }
friend class RenderWidget;
bool useSlowRepaints(bool considerOverlap = true) const;
bool useSlowRepaintsIfNotOverlapped() const;
void updateCanBlitOnScrollRecursively();
bool shouldLayoutAfterContentsResized() const;
void cancelScheduledScrollToFocusedElement();
void cancelScheduledTextFragmentIndicatorTimer();
ScrollingCoordinator* scrollingCoordinator() const;
bool shouldUpdateCompositingLayersAfterScrolling() const;
bool flushCompositingStateForThisFrame(const LocalFrame& rootFrameForFlush);
bool shouldDeferScrollUpdateAfterContentSizeChange() final;
void scrollOffsetChangedViaPlatformWidgetImpl(const ScrollOffset& oldOffset, const ScrollOffset& newOffset) final;
void applyOverflowToViewport(const RenderElement&, ScrollbarMode& hMode, ScrollbarMode& vMode);
void applyPaginationToViewport();
void updateOverflowStatus(bool horizontalOverflow, bool verticalOverflow);
void forceLayoutParentViewIfNeeded();
void flushPostLayoutTasksQueue();
void performPostLayoutTasks();
enum class AutoSizeMode : uint8_t { FixedWidth, SizeToContent };
void enableAutoSizeMode(bool enable, const IntSize& minSize, AutoSizeMode);
void autoSizeIfEnabled();
void performFixedWidthAutoSize();
void performSizeToContentAutoSize();
void applyRecursivelyWithVisibleRect(const Function<void(LocalFrameView& frameView, const IntRect& visibleRect)>&);
void resumeVisibleImageAnimations(const IntRect& visibleRect);
#if ENABLE(ACCESSIBILITY_ANIMATION_CONTROL)
void updatePlayStateForAllAnimations(const IntRect& visibleRect);
#endif
void updateScriptedAnimationsAndTimersThrottlingState(const IntRect& visibleRect);
WEBCORE_EXPORT void adjustTiledBackingCoverage();
void repaintContentRectangle(const IntRect&) final;
void addedOrRemovedScrollbar() final;
void scrollToFocusedElementTimerFired();
void scrollToFocusedElementInternal();
void delegatedScrollingModeDidChange() final;
void unobscuredContentSizeChanged() final;
void textFragmentIndicatorTimerFired();
// ScrollableArea interface
void invalidateScrollbarRect(Scrollbar&, const IntRect&) final;
void scrollTo(const ScrollPosition&) final;
void setVisibleScrollerThumbRect(const IntRect&) final;
ScrollableArea* enclosingScrollableArea() const final;
IntRect scrollableAreaBoundingBox(bool* = nullptr) const final;
bool scrollAnimatorEnabled() const final;
GraphicsLayer* layerForScrollCorner() const final;
#if HAVE(RUBBER_BANDING)
GraphicsLayer* layerForOverhangAreas() const final;
#endif
bool isInStableState() const final;
void contentsResized() final;
#if ENABLE(DARK_MODE_CSS)
RenderObject* rendererForColorScheme() const;
#endif
bool usesCompositedScrolling() const final;
bool mockScrollbarsControllerEnabled() const final;
void logMockScrollbarsControllerMessage(const String&) const final;
bool canShowNonOverlayScrollbars() const final;
bool styleHidesScrollbarWithOrientation(ScrollbarOrientation) const;
NativeScrollbarVisibility horizontalNativeScrollbarVisibility() const final;
NativeScrollbarVisibility verticalNativeScrollbarVisibility() const final;
// Override scrollbar notifications to update the AXObject cache.
void didAddScrollbar(Scrollbar*, ScrollbarOrientation) final;
void willRemoveScrollbar(Scrollbar*, ScrollbarOrientation) final;
IntSize sizeForResizeEvent() const;
void scheduleResizeEventIfNeeded();
RefPtr<Element> rootElementForCustomScrollbarPartStyle(PseudoId) const;
void adjustScrollbarsForLayout(bool firstLayout);
void handleDeferredScrollbarsUpdate();
void handleDeferredPositionScrollbarLayers();
void updateScrollableAreaSet();
void updateLayoutViewport();
void enableSpeculativeTilingIfNeeded();
void speculativeTilingEnableTimerFired();
void updateEmbeddedObjectsTimerFired();
bool updateEmbeddedObjects();
void updateEmbeddedObject(RenderEmbeddedObject&);
void updateWidgetPositionsTimerFired();
bool scrollToFragmentInternal(StringView);
void scheduleScrollToAnchorAndTextFragment();
void scrollToAnchorAndTextFragmentNowIfNeeded();
void scrollToAnchor();
void scrollToTextFragmentRange();
void scrollPositionChanged(const ScrollPosition& oldPosition, const ScrollPosition& newPosition);
void scrollableAreaSetChanged();
void scheduleScrollEvent();
void resetScrollAnchor();
void notifyScrollableAreasThatContentAreaWillPaint() const;
bool hasCustomScrollbars() const;
void updateScrollCorner() final;
LocalFrameView* parentFrameView() const;
void markRootOrBodyRendererDirty() const;
bool qualifiesAsSignificantRenderedText() const;
void updateHasReachedSignificantRenderedTextThreshold();
bool isViewForDocumentInFrame() const;
void notifyWidgetsInAllFrames(WidgetNotification);
void removeFromAXObjectCache();
void notifyWidgets(WidgetNotification);
RenderElement* viewportRenderer() const;
void willDoLayout(WeakPtr<RenderElement> layoutRoot);
void didLayout(WeakPtr<RenderElement> layoutRoot);
FloatSize calculateSizeForCSSViewportUnitsOverride(std::optional<OverrideViewportSize>) const;
void overrideWidthForCSSDefaultViewportUnits(float);
void resetOverriddenWidthForCSSDefaultViewportUnits();
void overrideWidthForCSSSmallViewportUnits(float);
void resetOverriddenWidthForCSSSmallViewportUnits();
void overrideWidthForCSSLargeViewportUnits(float);
void resetOverriddenWidthForCSSLargeViewportUnits();
void didFinishProhibitingScrollingWhenChangingContentSize() final;
// ScrollableArea.
float pageScaleFactor() const override;
void didStartScrollAnimation() final;
static MonotonicTime sCurrentPaintTimeStamp; // used for detecting decoded resource thrash in the cache
void scrollRectToVisibleInChildView(const LayoutRect& absoluteRect, bool insideFixed, const ScrollRectToVisibleOptions&, const HTMLFrameOwnerElement*);
void scrollRectToVisibleInTopLevelView(const LayoutRect& absoluteRect, bool insideFixed, const ScrollRectToVisibleOptions&);
LayoutRect getPossiblyFixedRectToExpose(const LayoutRect& visibleRect, const LayoutRect& exposeRect, bool insideFixed, const ScrollAlignment& alignX, const ScrollAlignment& alignY) const;
float deviceScaleFactor() const final;
const Ref<LocalFrame> m_frame;
LocalFrameViewLayoutContext m_layoutContext;
std::unique_ptr<Display::View> m_displayView;
HashSet<Widget*> m_widgetsInRenderTree;
std::unique_ptr<ListHashSet<RenderEmbeddedObject*>> m_embeddedObjectsToUpdate;
std::unique_ptr<WeakHashSet<RenderElement>> m_slowRepaintObjects;
RefPtr<ContainerNode> m_maintainScrollPositionAnchor;
RefPtr<Node> m_nodeToDraw;
std::optional<SimpleRange> m_pendingTextFragmentIndicatorRange;
String m_pendingTextFragmentIndicatorText;
bool m_skipScrollResetOfScrollToTextFragmentRange { false };
// Renderer to hold our custom scroll corner.
RenderPtr<RenderScrollbarPart> m_scrollCorner;
Timer m_updateEmbeddedObjectsTimer;
Timer m_updateWidgetPositionsTimer;
Timer m_delayedScrollEventTimer;
Timer m_delayedScrollToFocusedElementTimer;
Timer m_speculativeTilingEnableTimer;
Timer m_delayedTextFragmentIndicatorTimer;
MonotonicTime m_lastPaintTime;
LayoutSize m_lastUsedSizeForLayout;
Color m_baseBackgroundColor { Color::white };
IntSize m_lastViewportSize;
AtomString m_mediaType;
AtomString m_mediaTypeWhenNotPrinting;
Vector<FloatRect> m_trackedRepaintRects;
IntRect* m_cachedWindowClipRect { nullptr };
LayoutPoint m_layoutViewportOrigin;
std::optional<LayoutRect> m_layoutViewportOverrideRect;
std::optional<LayoutRect> m_visualViewportOverrideRect; // Used when the iOS keyboard is showing.
std::optional<FloatRect> m_viewExposedRect;
OptionSet<PaintBehavior> m_paintBehavior;
float m_lastZoomFactor { 1 };
unsigned m_visuallyNonEmptyCharacterCount { 0 };
unsigned m_visuallyNonEmptyPixelCount { 0 };
unsigned m_textRendererCountForVisuallyNonEmptyCharacters { 0 };
int m_headerHeight { 0 };
int m_footerHeight { 0 };
#if PLATFORM(IOS_FAMILY)
bool m_useCustomFixedPositionLayoutRect { false };
IntRect m_customFixedPositionLayoutRect;
std::optional<IntSize> m_customSizeForResizeEvent;
#endif
std::optional<OverrideViewportSize> m_defaultViewportSizeOverride;
std::optional<OverrideViewportSize> m_smallViewportSizeOverride;
std::optional<OverrideViewportSize> m_largeViewportSizeOverride;
// The view size when autosizing.
IntSize m_autoSizeConstraint;
// The fixed height to resize the view to after autosizing is complete.
int m_autoSizeFixedMinimumHeight { 0 };
// The intrinsic content size decided by autosizing.
IntSize m_autoSizeContentSize;
std::unique_ptr<ScrollableAreaSet> m_scrollableAreas;
std::unique_ptr<ScrollableAreaSet> m_scrollableAreasForAnimatedScroll;
std::unique_ptr<WeakHashSet<RenderLayerModelObject>> m_viewportConstrainedObjects;