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webkit / WebKit / c1d908c6d09e57f5313762b1b02c5605b1594985 / . / Source / WebCore / page / FrameView.cpp
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/*
* Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
* 1999 Lars Knoll <knoll@kde.org>
* 1999 Antti Koivisto <koivisto@kde.org>
* 2000 Dirk Mueller <mueller@kde.org>
* Copyright (C) 2004-2008, 2013, 2014 Apple Inc. All rights reserved.
* (C) 2006 Graham Dennis (graham.dennis@gmail.com)
* (C) 2006 Alexey Proskuryakov (ap@nypop.com)
* Copyright (C) 2009 Google 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.
*/
#include "config.h"
#include "FrameView.h"
#include "AXObjectCache.h"
#include "AnimationController.h"
#include "BackForwardController.h"
#include "CachedImage.h"
#include "CachedResourceLoader.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "DOMWindow.h"
#include "DebugPageOverlays.h"
#include "DocumentMarkerController.h"
#include "EventHandler.h"
#include "FloatRect.h"
#include "FocusController.h"
#include "FontCache.h"
#include "FontLoader.h"
#include "FrameLoader.h"
#include "FrameLoaderClient.h"
#include "FrameSelection.h"
#include "FrameTree.h"
#include "GraphicsContext.h"
#include "HTMLDocument.h"
#include "HTMLFrameElement.h"
#include "HTMLFrameSetElement.h"
#include "HTMLNames.h"
#include "HTMLPlugInImageElement.h"
#include "ImageDocument.h"
#include "InspectorClient.h"
#include "InspectorController.h"
#include "InspectorInstrumentation.h"
#include "Logging.h"
#include "MainFrame.h"
#include "MemoryCache.h"
#include "MemoryPressureHandler.h"
#include "OverflowEvent.h"
#include "PageOverlayController.h"
#include "ProgressTracker.h"
#include "RenderEmbeddedObject.h"
#include "RenderFullScreen.h"
#include "RenderIFrame.h"
#include "RenderInline.h"
#include "RenderLayer.h"
#include "RenderLayerBacking.h"
#include "RenderLayerCompositor.h"
#include "RenderSVGRoot.h"
#include "RenderScrollbar.h"
#include "RenderScrollbarPart.h"
#include "RenderStyle.h"
#include "RenderText.h"
#include "RenderTheme.h"
#include "RenderView.h"
#include "RenderWidget.h"
#include "SVGDocument.h"
#include "SVGSVGElement.h"
#include "ScrollAnimator.h"
#include "ScrollingCoordinator.h"
#include "Settings.h"
#include "StyleResolver.h"
#include "TextResourceDecoder.h"
#include "TextStream.h"
#include "TiledBacking.h"
#include <wtf/CurrentTime.h>
#include <wtf/Ref.h>
#include <wtf/TemporaryChange.h>
#if USE(TILED_BACKING_STORE)
#include "TiledBackingStore.h"
#endif
#if ENABLE(TEXT_AUTOSIZING)
#include "TextAutosizer.h"
#endif
#if ENABLE(CSS_SCROLL_SNAP)
#include "AxisScrollSnapOffsets.h"
#endif
#if PLATFORM(IOS)
#include "DocumentLoader.h"
#include "LegacyTileCache.h"
#include "MemoryCache.h"
#include "MemoryPressureHandler.h"
#include "SystemMemory.h"
#endif
namespace WebCore {
using namespace HTMLNames;
double FrameView::sCurrentPaintTimeStamp = 0.0;
// The maximum number of updateEmbeddedObjects iterations that should be done before returning.
static const unsigned maxUpdateEmbeddedObjectsIterations = 2;
static RenderLayer::UpdateLayerPositionsFlags updateLayerPositionFlags(RenderLayer* layer, bool isRelayoutingSubtree, bool didFullRepaint)
{
RenderLayer::UpdateLayerPositionsFlags flags = RenderLayer::defaultFlags;
if (didFullRepaint) {
flags &= ~RenderLayer::CheckForRepaint;
flags |= RenderLayer::NeedsFullRepaintInBacking;
}
if (isRelayoutingSubtree && layer->enclosingPaginationLayer(RenderLayer::IncludeCompositedPaginatedLayers))
flags |= RenderLayer::UpdatePagination;
return flags;
}
Pagination::Mode paginationModeForRenderStyle(const RenderStyle& style)
{
EOverflow overflow = style.overflowY();
if (overflow != OPAGEDX && overflow != OPAGEDY)
return Pagination::Unpaginated;
bool isHorizontalWritingMode = style.isHorizontalWritingMode();
TextDirection textDirection = style.direction();
WritingMode writingMode = style.writingMode();
// paged-x always corresponds to LeftToRightPaginated or RightToLeftPaginated. If the WritingMode
// is horizontal, then we use TextDirection to choose between those options. If the WritingMode
// is vertical, then the direction of the verticality dictates the choice.
if (overflow == OPAGEDX) {
if ((isHorizontalWritingMode && textDirection == LTR) || writingMode == LeftToRightWritingMode)
return Pagination::LeftToRightPaginated;
return Pagination::RightToLeftPaginated;
}
// paged-y always corresponds to TopToBottomPaginated or BottomToTopPaginated. If the WritingMode
// is horizontal, then the direction of the horizontality dictates the choice. If the WritingMode
// is vertical, then we use TextDirection to choose between those options.
if (writingMode == TopToBottomWritingMode || (!isHorizontalWritingMode && textDirection == RTL))
return Pagination::TopToBottomPaginated;
return Pagination::BottomToTopPaginated;
}
FrameView::FrameView(Frame& frame)
: m_frame(&frame)
, m_canHaveScrollbars(true)
, m_layoutTimer(*this, &FrameView::layoutTimerFired)
, m_layoutRoot(0)
, m_layoutPhase(OutsideLayout)
, m_inSynchronousPostLayout(false)
, m_postLayoutTasksTimer(*this, &FrameView::postLayoutTimerFired)
, m_updateEmbeddedObjectsTimer(*this, &FrameView::updateEmbeddedObjectsTimerFired)
, m_isTransparent(false)
, m_baseBackgroundColor(Color::white)
, m_mediaType("screen")
, m_overflowStatusDirty(true)
, m_viewportRenderer(0)
, m_wasScrolledByUser(false)
, m_inProgrammaticScroll(false)
, m_safeToPropagateScrollToParent(true)
, m_delayedScrollEventTimer(*this, &FrameView::delayedScrollEventTimerFired)
, m_isTrackingRepaints(false)
, m_shouldUpdateWhileOffscreen(true)
, m_exposedRect(FloatRect::infiniteRect())
, m_deferSetNeedsLayouts(0)
, m_setNeedsLayoutWasDeferred(false)
, m_speculativeTilingEnabled(false)
, m_speculativeTilingEnableTimer(*this, &FrameView::speculativeTilingEnableTimerFired)
#if PLATFORM(IOS)
, m_useCustomFixedPositionLayoutRect(false)
, m_useCustomSizeForResizeEvent(false)
, m_horizontalVelocity(0)
, m_verticalVelocity(0)
, m_scaleChangeRate(0)
, m_lastVelocityUpdateTime(0)
#endif
, m_hasOverrideViewportSize(false)
, m_shouldAutoSize(false)
, m_inAutoSize(false)
, m_didRunAutosize(false)
, m_autoSizeFixedMinimumHeight(0)
, m_headerHeight(0)
, m_footerHeight(0)
, m_milestonesPendingPaint(0)
, m_visualUpdatesAllowedByClient(true)
, m_scrollPinningBehavior(DoNotPin)
{
init();
#if ENABLE(RUBBER_BANDING)
ScrollElasticity verticalElasticity = ScrollElasticityNone;
ScrollElasticity horizontalElasticity = ScrollElasticityNone;
if (m_frame->isMainFrame()) {
verticalElasticity = m_frame->page() ? m_frame->page()->verticalScrollElasticity() : ScrollElasticityAllowed;
horizontalElasticity = m_frame->page() ? m_frame->page()->horizontalScrollElasticity() : ScrollElasticityAllowed;
} else if (m_frame->settings().rubberBandingForSubScrollableRegionsEnabled()) {
verticalElasticity = ScrollElasticityAutomatic;
horizontalElasticity = ScrollElasticityAutomatic;
}
ScrollableArea::setVerticalScrollElasticity(verticalElasticity);
ScrollableArea::setHorizontalScrollElasticity(horizontalElasticity);
#endif
}
PassRefPtr<FrameView> FrameView::create(Frame& frame)
{
RefPtr<FrameView> view = adoptRef(new FrameView(frame));
view->show();
return view.release();
}
PassRefPtr<FrameView> FrameView::create(Frame& frame, const IntSize& initialSize)
{
RefPtr<FrameView> view = adoptRef(new FrameView(frame));
view->Widget::setFrameRect(IntRect(view->location(), initialSize));
view->show();
return view.release();
}
FrameView::~FrameView()
{
if (m_postLayoutTasksTimer.isActive())
m_postLayoutTasksTimer.stop();
removeFromAXObjectCache();
resetScrollbars();
// Custom scrollbars should already be destroyed at this point
ASSERT(!horizontalScrollbar() || !horizontalScrollbar()->isCustomScrollbar());
ASSERT(!verticalScrollbar() || !verticalScrollbar()->isCustomScrollbar());
setHasHorizontalScrollbar(false); // Remove native scrollbars now before we lose the connection to the HostWindow.
setHasVerticalScrollbar(false);
ASSERT(!m_scrollCorner);
ASSERT(frame().view() != this || !frame().contentRenderer());
}
void FrameView::reset()
{
m_cannotBlitToWindow = false;
m_isOverlapped = false;
m_contentIsOpaque = false;
m_layoutTimer.stop();
m_layoutRoot = 0;
m_delayedLayout = false;
m_needsFullRepaint = true;
m_layoutSchedulingEnabled = true;
m_layoutPhase = OutsideLayout;
m_inSynchronousPostLayout = false;
m_layoutCount = 0;
m_nestedLayoutCount = 0;
m_postLayoutTasksTimer.stop();
m_updateEmbeddedObjectsTimer.stop();
m_firstLayout = true;
m_firstLayoutCallbackPending = false;
m_wasScrolledByUser = false;
m_safeToPropagateScrollToParent = true;
m_delayedScrollEventTimer.stop();
m_lastViewportSize = IntSize();
m_lastZoomFactor = 1.0f;
m_isTrackingRepaints = false;
m_trackedRepaintRects.clear();
m_lastPaintTime = 0;
m_paintBehavior = PaintBehaviorNormal;
m_isPainting = false;
m_visuallyNonEmptyCharacterCount = 0;
m_visuallyNonEmptyPixelCount = 0;
m_isVisuallyNonEmpty = false;
m_firstVisuallyNonEmptyLayoutCallbackPending = true;
m_maintainScrollPositionAnchor = nullptr;
m_throttledTimers.clear();
}
void FrameView::removeFromAXObjectCache()
{
if (AXObjectCache* cache = axObjectCache())
cache->remove(this);
}
void FrameView::resetScrollbars()
{
// Reset the document's scrollbars back to our defaults before we yield the floor.
m_firstLayout = true;
setScrollbarsSuppressed(true);
if (m_canHaveScrollbars)
setScrollbarModes(ScrollbarAuto, ScrollbarAuto);
else
setScrollbarModes(ScrollbarAlwaysOff, ScrollbarAlwaysOff);
setScrollbarsSuppressed(false);
}
void FrameView::resetScrollbarsAndClearContentsSize()
{
resetScrollbars();
setScrollbarsSuppressed(true);
setContentsSize(IntSize());
setScrollbarsSuppressed(false);
}
void FrameView::init()
{
reset();
m_margins = LayoutSize(-1, -1); // undefined
m_size = LayoutSize();
// Propagate the marginwidth/height and scrolling modes to the view.
Element* ownerElement = frame().ownerElement();
if (is<HTMLFrameElementBase>(ownerElement)) {
HTMLFrameElementBase& frameElement = downcast<HTMLFrameElementBase>(*ownerElement);
if (frameElement.scrollingMode() == ScrollbarAlwaysOff)
setCanHaveScrollbars(false);
LayoutUnit marginWidth = frameElement.marginWidth();
LayoutUnit marginHeight = frameElement.marginHeight();
if (marginWidth != -1)
setMarginWidth(marginWidth);
if (marginHeight != -1)
setMarginHeight(marginHeight);
}
Page* page = frame().page();
if (page && page->chrome().client().shouldPaintEntireContents())
setPaintsEntireContents(true);
}
void FrameView::prepareForDetach()
{
detachCustomScrollbars();
// When the view is no longer associated with a frame, it needs to be removed from the ax object cache
// right now, otherwise it won't be able to reach the topDocument()'s axObject cache later.
removeFromAXObjectCache();
if (frame().page()) {
if (ScrollingCoordinator* scrollingCoordinator = frame().page()->scrollingCoordinator())
scrollingCoordinator->willDestroyScrollableArea(this);
}
}
void FrameView::detachCustomScrollbars()
{
Scrollbar* horizontalBar = horizontalScrollbar();
if (horizontalBar && horizontalBar->isCustomScrollbar())
setHasHorizontalScrollbar(false);
Scrollbar* verticalBar = verticalScrollbar();
if (verticalBar && verticalBar->isCustomScrollbar())
setHasVerticalScrollbar(false);
m_scrollCorner = nullptr;
}
void FrameView::recalculateScrollbarOverlayStyle()
{
ScrollbarOverlayStyle oldOverlayStyle = scrollbarOverlayStyle();
ScrollbarOverlayStyle overlayStyle = ScrollbarOverlayStyleDefault;
Color backgroundColor = documentBackgroundColor();
if (backgroundColor.isValid()) {
// Reduce the background color from RGB to a lightness value
// and determine which scrollbar style to use based on a lightness
// heuristic.
double hue, saturation, lightness;
backgroundColor.getHSL(hue, saturation, lightness);
if (lightness <= .5 && backgroundColor.alpha() > 0)
overlayStyle = ScrollbarOverlayStyleLight;
}
if (oldOverlayStyle != overlayStyle)
setScrollbarOverlayStyle(overlayStyle);
}
void FrameView::clear()
{
setCanBlitOnScroll(true);
reset();
setScrollbarsSuppressed(true);
#if PLATFORM(IOS)
// To avoid flashes of white, disable tile updates immediately when view is cleared at the beginning of a page load.
// Tiling will be re-enabled from UIKit via [WAKWindow setTilingMode:] when we have content to draw.
if (LegacyTileCache* tileCache = legacyTileCache())
tileCache->setTilingMode(LegacyTileCache::Disabled);
#endif
}
bool FrameView::didFirstLayout() const
{
return !m_firstLayout;
}
void FrameView::invalidateRect(const IntRect& rect)
{
if (!parent()) {
if (HostWindow* window = hostWindow())
window->invalidateContentsAndRootView(rect);
return;
}
RenderWidget* renderer = frame().ownerRenderer();
if (!renderer)
return;
IntRect repaintRect = rect;
repaintRect.move(renderer->borderLeft() + renderer->paddingLeft(),
renderer->borderTop() + renderer->paddingTop());
renderer->repaintRectangle(repaintRect);
}
void FrameView::setFrameRect(const IntRect& newRect)
{
IntRect oldRect = frameRect();
if (newRect == oldRect)
return;
#if ENABLE(TEXT_AUTOSIZING)
// Autosized font sizes depend on the width of the viewing area.
if (newRect.width() != oldRect.width()) {
if (frame().isMainFrame() && page->settings().textAutosizingEnabled()) {
for (Frame* frame = &page->mainFrame(); frame; frame = frame->tree().traverseNext())
frame().document()->textAutosizer()->recalculateMultipliers();
}
}
#endif
ScrollView::setFrameRect(newRect);
updateScrollableAreaSet();
if (RenderView* renderView = this->renderView()) {
if (renderView->usesCompositing())
renderView->compositor().frameViewDidChangeSize();
}
if (frame().isMainFrame())
frame().mainFrame().pageOverlayController().didChangeViewSize();
}
#if ENABLE(REQUEST_ANIMATION_FRAME)
bool FrameView::scheduleAnimation()
{
if (HostWindow* window = hostWindow()) {
window->scheduleAnimation();
return true;
}
return false;
}
#endif
void FrameView::setMarginWidth(LayoutUnit w)
{
// make it update the rendering area when set
m_margins.setWidth(w);
}
void FrameView::setMarginHeight(LayoutUnit h)
{
// make it update the rendering area when set
m_margins.setHeight(h);
}
bool FrameView::frameFlatteningEnabled() const
{
return frame().settings().frameFlatteningEnabled();
}
bool FrameView::isFrameFlatteningValidForThisFrame() const
{
if (!frameFlatteningEnabled())
return false;
HTMLFrameOwnerElement* owner = frame().ownerElement();
if (!owner)
return false;
// Frame flattening is valid only for <frame> and <iframe>.
return owner->hasTagName(frameTag) || owner->hasTagName(iframeTag);
}
bool FrameView::avoidScrollbarCreation() const
{
// with frame flattening no subframe can have scrollbars
// but we also cannot turn scrollbars off as we determine
// our flattening policy using that.
return isFrameFlatteningValidForThisFrame();
}
void FrameView::setCanHaveScrollbars(bool canHaveScrollbars)
{
m_canHaveScrollbars = canHaveScrollbars;
ScrollView::setCanHaveScrollbars(canHaveScrollbars);
}
void FrameView::updateCanHaveScrollbars()
{
ScrollbarMode hMode;
ScrollbarMode vMode;
scrollbarModes(hMode, vMode);
if (hMode == ScrollbarAlwaysOff && vMode == ScrollbarAlwaysOff)
setCanHaveScrollbars(false);
else
setCanHaveScrollbars(true);
}
PassRefPtr<Scrollbar> FrameView::createScrollbar(ScrollbarOrientation orientation)
{
if (!frame().settings().allowCustomScrollbarInMainFrame() && frame().isMainFrame())
return ScrollView::createScrollbar(orientation);
// FIXME: We need to update the scrollbar dynamically as documents change (or as doc elements and bodies get discovered that have custom styles).
Document* doc = frame().document();
// Try the <body> element first as a scrollbar source.
Element* body = doc ? doc->body() : 0;
if (body && body->renderer() && body->renderer()->style().hasPseudoStyle(SCROLLBAR))
return RenderScrollbar::createCustomScrollbar(this, orientation, body);
// If the <body> didn't have a custom style, then the root element might.
Element* docElement = doc ? doc->documentElement() : 0;
if (docElement && docElement->renderer() && docElement->renderer()->style().hasPseudoStyle(SCROLLBAR))
return RenderScrollbar::createCustomScrollbar(this, orientation, docElement);
// If we have an owning iframe/frame element, then it can set the custom scrollbar also.
RenderWidget* frameRenderer = frame().ownerRenderer();
if (frameRenderer && frameRenderer->style().hasPseudoStyle(SCROLLBAR))
return RenderScrollbar::createCustomScrollbar(this, orientation, 0, &frame());
// Nobody set a custom style, so we just use a native scrollbar.
return ScrollView::createScrollbar(orientation);
}
void FrameView::setContentsSize(const IntSize& size)
{
if (size == contentsSize())
return;
m_deferSetNeedsLayouts++;
ScrollView::setContentsSize(size);
ScrollView::contentsResized();
Page* page = frame().page();
if (!page)
return;
updateScrollableAreaSet();
page->chrome().contentsSizeChanged(&frame(), size); // Notify only.
if (frame().isMainFrame())
frame().mainFrame().pageOverlayController().didChangeDocumentSize();
ASSERT(m_deferSetNeedsLayouts);
m_deferSetNeedsLayouts--;
if (!m_deferSetNeedsLayouts)
m_setNeedsLayoutWasDeferred = false; // FIXME: Find a way to make the deferred layout actually happen.
}
void FrameView::adjustViewSize()
{
RenderView* renderView = this->renderView();
if (!renderView)
return;
ASSERT(frame().view() == this);
const IntRect rect = renderView->documentRect();
const IntSize& size = rect.size();
ScrollView::setScrollOrigin(IntPoint(-rect.x(), -rect.y()), !frame().document()->printing(), size == contentsSize());
setContentsSize(size);
}
void FrameView::applyOverflowToViewport(RenderElement* renderer, ScrollbarMode& hMode, ScrollbarMode& vMode)
{
// Handle the overflow:hidden/scroll case for the body/html elements. WinIE treats
// overflow:hidden and overflow:scroll on <body> as applying to the document's
// scrollbars. The CSS2.1 draft states that HTML UAs should use the <html> or <body> element and XML/XHTML UAs should
// use the root element.
// To combat the inability to scroll on a page with overflow:hidden on the root when scaled, disregard hidden when
// there is a frameScaleFactor that is greater than one on the main frame. Also disregard hidden if there is a
// header or footer.
bool overrideHidden = frame().isMainFrame() && ((frame().frameScaleFactor() > 1) || headerHeight() || footerHeight());
EOverflow overflowX = renderer->style().overflowX();
EOverflow overflowY = renderer->style().overflowY();
if (is<RenderSVGRoot>(*renderer)) {
// FIXME: evaluate if we can allow overflow for these cases too.
// Overflow is always hidden when stand-alone SVG documents are embedded.
if (downcast<RenderSVGRoot>(*renderer).isEmbeddedThroughFrameContainingSVGDocument()) {
overflowX = OHIDDEN;
overflowY = OHIDDEN;
}
}
switch (overflowX) {
case OHIDDEN:
if (overrideHidden)
hMode = ScrollbarAuto;
else
hMode = ScrollbarAlwaysOff;
break;
case OSCROLL:
hMode = ScrollbarAlwaysOn;
break;
case OAUTO:
hMode = ScrollbarAuto;
break;
default:
// Don't set it at all.
;
}
switch (overflowY) {
case OHIDDEN:
if (overrideHidden)
vMode = ScrollbarAuto;
else
vMode = ScrollbarAlwaysOff;
break;
case OSCROLL:
vMode = ScrollbarAlwaysOn;
break;
case OAUTO:
vMode = ScrollbarAuto;
break;
default:
// Don't set it at all. Values of OPAGEDX and OPAGEDY are handled by applyPaginationToViewPort().
;
}
m_viewportRenderer = renderer;
}
void FrameView::applyPaginationToViewport()
{
Document* document = frame().document();
auto documentElement = document->documentElement();
RenderElement* documentRenderer = documentElement ? documentElement->renderer() : nullptr;
RenderElement* documentOrBodyRenderer = documentRenderer;
auto body = document->body();
if (body && body->renderer()) {
if (body->hasTagName(bodyTag))
documentOrBodyRenderer = documentRenderer->style().overflowX() == OVISIBLE && documentElement->hasTagName(htmlTag) ? body->renderer() : documentRenderer;
}
Pagination pagination;
if (!documentOrBodyRenderer) {
setPagination(pagination);
return;
}
EOverflow overflowY = documentOrBodyRenderer->style().overflowY();
if (overflowY == OPAGEDX || overflowY == OPAGEDY) {
pagination.mode = WebCore::paginationModeForRenderStyle(documentOrBodyRenderer->style());
pagination.gap = static_cast<unsigned>(documentOrBodyRenderer->style().columnGap());
}
setPagination(pagination);
}
void FrameView::calculateScrollbarModesForLayout(ScrollbarMode& hMode, ScrollbarMode& vMode, ScrollbarModesCalculationStrategy strategy)
{
m_viewportRenderer = 0;
const HTMLFrameOwnerElement* owner = frame().ownerElement();
if (owner && (owner->scrollingMode() == ScrollbarAlwaysOff)) {
hMode = ScrollbarAlwaysOff;
vMode = ScrollbarAlwaysOff;
return;
}
if (m_canHaveScrollbars || strategy == RulesFromWebContentOnly) {
hMode = ScrollbarAuto;
vMode = ScrollbarAuto;
} else {
hMode = ScrollbarAlwaysOff;
vMode = ScrollbarAlwaysOff;
}
if (!m_layoutRoot) {
Document* document = frame().document();
auto documentElement = document->documentElement();
RenderElement* rootRenderer = documentElement ? documentElement->renderer() : nullptr;
auto body = document->body();
if (body && body->renderer()) {
if (body->hasTagName(framesetTag) && !frameFlatteningEnabled()) {
vMode = ScrollbarAlwaysOff;
hMode = ScrollbarAlwaysOff;
} else if (body->hasTagName(bodyTag)) {
// It's sufficient to just check the X overflow,
// since it's illegal to have visible in only one direction.
RenderElement* o = rootRenderer->style().overflowX() == OVISIBLE && document->documentElement()->hasTagName(htmlTag) ? body->renderer() : rootRenderer;
applyOverflowToViewport(o, hMode, vMode);
}
} else if (rootRenderer)
applyOverflowToViewport(rootRenderer, hMode, vMode);
}
}
void FrameView::updateCompositingLayersAfterStyleChange()
{
RenderView* renderView = this->renderView();
if (!renderView)
return;
// If we expect to update compositing after an incipient layout, don't do so here.
if (inPreLayoutStyleUpdate() || layoutPending() || renderView->needsLayout())
return;
RenderLayerCompositor& compositor = renderView->compositor();
// This call will make sure the cached hasAcceleratedCompositing is updated from the pref
compositor.cacheAcceleratedCompositingFlags();
compositor.updateCompositingLayers(CompositingUpdateAfterStyleChange);
}
void FrameView::updateCompositingLayersAfterLayout()
{
RenderView* renderView = this->renderView();
if (!renderView)
return;
// This call will make sure the cached hasAcceleratedCompositing is updated from the pref
renderView->compositor().cacheAcceleratedCompositingFlags();
renderView->compositor().updateCompositingLayers(CompositingUpdateAfterLayout);
}
void FrameView::clearBackingStores()
{
RenderView* renderView = this->renderView();
if (!renderView)
return;
RenderLayerCompositor& compositor = renderView->compositor();
ASSERT(compositor.inCompositingMode());
compositor.enableCompositingMode(false);
compositor.clearBackingForAllLayers();
}
void FrameView::restoreBackingStores()
{
RenderView* renderView = this->renderView();
if (!renderView)
return;
RenderLayerCompositor& compositor = renderView->compositor();
compositor.enableCompositingMode(true);
compositor.updateCompositingLayers(CompositingUpdateAfterLayout);
}
GraphicsLayer* FrameView::layerForScrolling() const
{
RenderView* renderView = this->renderView();
if (!renderView)
return 0;
return renderView->compositor().scrollLayer();
}
GraphicsLayer* FrameView::layerForHorizontalScrollbar() const
{
RenderView* renderView = this->renderView();
if (!renderView)
return 0;
return renderView->compositor().layerForHorizontalScrollbar();
}
GraphicsLayer* FrameView::layerForVerticalScrollbar() const
{
RenderView* renderView = this->renderView();
if (!renderView)
return 0;
return renderView->compositor().layerForVerticalScrollbar();
}
GraphicsLayer* FrameView::layerForScrollCorner() const
{
RenderView* renderView = this->renderView();
if (!renderView)
return 0;
return renderView->compositor().layerForScrollCorner();
}
TiledBacking* FrameView::tiledBacking() const
{
RenderView* renderView = this->renderView();
if (!renderView)
return 0;
RenderLayerBacking* backing = renderView->layer()->backing();
if (!backing)
return 0;
return backing->graphicsLayer()->tiledBacking();
}
uint64_t FrameView::scrollLayerID() const
{
RenderView* renderView = this->renderView();
if (!renderView)
return 0;
RenderLayerBacking* backing = renderView->layer()->backing();
if (!backing)
return 0;
return backing->scrollingNodeIDForRole(FrameScrollingNode);
}
ScrollableArea* FrameView::scrollableAreaForScrollLayerID(uint64_t nodeID) const
{
RenderView* renderView = this->renderView();
if (!renderView)
return nullptr;
return renderView->compositor().scrollableAreaForScrollLayerID(nodeID);
}
#if ENABLE(RUBBER_BANDING)
GraphicsLayer* FrameView::layerForOverhangAreas() const
{
RenderView* renderView = this->renderView();
if (!renderView)
return 0;
return renderView->compositor().layerForOverhangAreas();
}
GraphicsLayer* FrameView::setWantsLayerForTopOverHangArea(bool wantsLayer) const
{
RenderView* renderView = this->renderView();
if (!renderView)
return 0;
return renderView->compositor().updateLayerForTopOverhangArea(wantsLayer);
}
GraphicsLayer* FrameView::setWantsLayerForBottomOverHangArea(bool wantsLayer) const
{
RenderView* renderView = this->renderView();
if (!renderView)
return 0;
return renderView->compositor().updateLayerForBottomOverhangArea(wantsLayer);
}
#endif // ENABLE(RUBBER_BANDING)
#if ENABLE(CSS_SCROLL_SNAP)
void FrameView::updateSnapOffsets()
{
if (!frame().document())
return;
// FIXME: Should we allow specifying snap points through <html> tags too?
HTMLElement* body = frame().document()->body();
if (!renderView() || !body || !body->renderer())
return;
updateSnapOffsetsForScrollableArea(*this, *body, *renderView(), body->renderer()->style());
}
#endif
bool FrameView::flushCompositingStateForThisFrame(Frame* rootFrameForFlush)
{
RenderView* renderView = this->renderView();
if (!renderView)
return true; // We don't want to keep trying to update layers if we have no renderer.
ASSERT(frame().view() == this);
// If we sync compositing layers when a layout is pending, we may cause painting of compositing
// layer content to occur before layout has happened, which will cause paintContents() to bail.
if (needsLayout())
return false;
#if PLATFORM(IOS)
if (LegacyTileCache* tileCache = legacyTileCache())
tileCache->doPendingRepaints();
#endif
renderView->compositor().flushPendingLayerChanges(rootFrameForFlush == &frame());
return true;
}
void FrameView::setNeedsOneShotDrawingSynchronization()
{
if (Page* page = frame().page())
page->chrome().client().setNeedsOneShotDrawingSynchronization();
}
GraphicsLayer* FrameView::graphicsLayerForPlatformWidget(PlatformWidget platformWidget)
{
// To find the Widget that corresponds with platformWidget we have to do a linear
// search of our child widgets.
Widget* foundWidget = nullptr;
for (auto& widget : children()) {
if (widget->platformWidget() != platformWidget)
continue;
foundWidget = widget.get();
break;
}
if (!foundWidget)
return nullptr;
auto* renderWidget = RenderWidget::find(foundWidget);
if (!renderWidget)
return nullptr;
RenderLayer* widgetLayer = renderWidget->layer();
if (!widgetLayer || !widgetLayer->isComposited())
return nullptr;
return widgetLayer->backing()->parentForSublayers();
}
void FrameView::scheduleLayerFlushAllowingThrottling()
{
RenderView* view = this->renderView();
if (!view)
return;
view->compositor().scheduleLayerFlush(true /* canThrottle */);
}
void FrameView::setHeaderHeight(int headerHeight)
{
if (frame().page())
ASSERT(frame().isMainFrame());
m_headerHeight = headerHeight;
if (RenderView* renderView = this->renderView())
renderView->setNeedsLayout();
}
void FrameView::setFooterHeight(int footerHeight)
{
if (frame().page())
ASSERT(frame().isMainFrame());
m_footerHeight = footerHeight;
if (RenderView* renderView = this->renderView())
renderView->setNeedsLayout();
}
float FrameView::topContentInset(TopContentInsetType contentInsetTypeToReturn) const
{
if (platformWidget() && contentInsetTypeToReturn == TopContentInsetType::WebCoreOrPlatformContentInset)
return platformTopContentInset();
if (!frame().isMainFrame())
return 0;
Page* page = frame().page();
return page ? page->topContentInset() : 0;
}
void FrameView::topContentInsetDidChange(float newTopContentInset)
{
RenderView* renderView = this->renderView();
if (!renderView)
return;
if (platformWidget())
platformSetTopContentInset(newTopContentInset);
layout();
updateScrollbars(scrollOffset());
if (renderView->usesCompositing())
renderView->compositor().frameViewDidChangeSize();
if (TiledBacking* tiledBacking = this->tiledBacking())
tiledBacking->setTopContentInset(newTopContentInset);
}
bool FrameView::hasCompositedContent() const
{
if (RenderView* renderView = this->renderView())
return renderView->compositor().inCompositingMode();
return false;
}
bool FrameView::hasCompositedContentIncludingDescendants() const
{
for (Frame* frame = m_frame.get(); frame; frame = frame->tree().traverseNext(m_frame.get())) {
RenderView* renderView = frame->contentRenderer();
if (RenderLayerCompositor* compositor = renderView ? &renderView->compositor() : 0) {
if (compositor->inCompositingMode())
return true;
if (!RenderLayerCompositor::allowsIndependentlyCompositedFrames(this))
break;
}
}
return false;
}
bool FrameView::hasCompositingAncestor() const
{
for (Frame* frame = this->frame().tree().parent(); frame; frame = frame->tree().parent()) {
if (FrameView* view = frame->view()) {
if (view->hasCompositedContent())
return true;
}
}
return false;
}
// Sometimes (for plug-ins) we need to eagerly go into compositing mode.
void FrameView::enterCompositingMode()
{
if (RenderView* renderView = this->renderView()) {
renderView->compositor().enableCompositingMode();
if (!needsLayout())
renderView->compositor().scheduleCompositingLayerUpdate();
}
}
bool FrameView::isEnclosedInCompositingLayer() const
{
auto frameOwnerRenderer = frame().ownerRenderer();
if (frameOwnerRenderer && frameOwnerRenderer->containerForRepaint())
return true;
if (FrameView* parentView = parentFrameView())
return parentView->isEnclosedInCompositingLayer();
return false;
}
bool FrameView::flushCompositingStateIncludingSubframes()
{
bool allFramesFlushed = flushCompositingStateForThisFrame(&frame());
for (Frame* child = frame().tree().firstChild(); child; child = child->tree().traverseNext(&frame())) {
bool flushed = child->view()->flushCompositingStateForThisFrame(&frame());
allFramesFlushed &= flushed;
}
return allFramesFlushed;
}
bool FrameView::isSoftwareRenderable() const
{
RenderView* renderView = this->renderView();
return !renderView || !renderView->compositor().has3DContent();
}
void FrameView::setIsInWindow(bool isInWindow)
{
if (RenderView* renderView = this->renderView())
renderView->setIsInWindow(isInWindow);
}
RenderObject* FrameView::layoutRoot(bool onlyDuringLayout) const
{
return onlyDuringLayout && layoutPending() ? 0 : m_layoutRoot;
}
inline void FrameView::forceLayoutParentViewIfNeeded()
{
RenderWidget* ownerRenderer = frame().ownerRenderer();
if (!ownerRenderer)
return;
RenderBox* contentBox = embeddedContentBox();
if (!contentBox)
return;
auto& svgRoot = downcast<RenderSVGRoot>(*contentBox);
if (svgRoot.everHadLayout() && !svgRoot.needsLayout())
return;
// If the embedded SVG document appears the first time, the ownerRenderer has already finished
// layout without knowing about the existence of the embedded SVG document, because RenderReplaced
// embeddedContentBox() returns 0, as long as the embedded document isn't loaded yet. Before
// bothering to lay out the SVG document, mark the ownerRenderer needing layout and ask its
// FrameView for a layout. After that the RenderEmbeddedObject (ownerRenderer) carries the
// correct size, which RenderSVGRoot::computeReplacedLogicalWidth/Height rely on, when laying
// out for the first time, or when the RenderSVGRoot size has changed dynamically (eg. via <script>).
Ref<FrameView> frameView(ownerRenderer->view().frameView());
// Mark the owner renderer as needing layout.
ownerRenderer->setNeedsLayoutAndPrefWidthsRecalc();
// Synchronously enter layout, to layout the view containing the host object/embed/iframe.
frameView->layout();
}
void FrameView::layout(bool allowSubtree)
{
if (isInLayout())
return;
// Protect the view from being deleted during layout (in recalcStyle).
Ref<FrameView> protect(*this);
// Many of the tasks performed during layout can cause this function to be re-entered,
// so save the layout phase now and restore it on exit.
TemporaryChange<LayoutPhase> layoutPhaseRestorer(m_layoutPhase, InPreLayout);
// Every scroll that happens during layout is programmatic.
TemporaryChange<bool> changeInProgrammaticScroll(m_inProgrammaticScroll, true);
bool inChildFrameLayoutWithFrameFlattening = isInChildFrameWithFrameFlattening();
if (inChildFrameLayoutWithFrameFlattening) {
startLayoutAtMainFrameViewIfNeeded(allowSubtree);
RenderElement* root = m_layoutRoot ? m_layoutRoot : frame().document()->renderView();
if (!root || !root->needsLayout())
return;
}
#if PLATFORM(IOS)
if (updateFixedPositionLayoutRect())
allowSubtree = false;
#endif
m_layoutTimer.stop();
m_delayedLayout = false;
m_setNeedsLayoutWasDeferred = false;
// we shouldn't enter layout() while painting
ASSERT(!isPainting());
if (isPainting())
return;
InspectorInstrumentationCookie cookie = InspectorInstrumentation::willLayout(&frame());
AnimationUpdateBlock animationUpdateBlock(&frame().animation());
if (!allowSubtree && m_layoutRoot) {
m_layoutRoot->markContainingBlocksForLayout(false);
m_layoutRoot = 0;
}
ASSERT(frame().view() == this);
ASSERT(frame().document());
Document& document = *frame().document();
ASSERT(!document.inPageCache());
bool subtree;
RenderElement* root;
{
TemporaryChange<bool> changeSchedulingEnabled(m_layoutSchedulingEnabled, false);
if (!m_nestedLayoutCount && !m_inSynchronousPostLayout && m_postLayoutTasksTimer.isActive() && !inChildFrameLayoutWithFrameFlattening) {
// This is a new top-level layout. If there are any remaining tasks from the previous
// layout, finish them now.
TemporaryChange<bool> inSynchronousPostLayoutChange(m_inSynchronousPostLayout, true);
performPostLayoutTasks();
}
m_layoutPhase = InPreLayoutStyleUpdate;
// Viewport-dependent media queries may cause us to need completely different style information.
StyleResolver* styleResolver = document.styleResolverIfExists();
if (!styleResolver || styleResolver->hasMediaQueriesAffectedByViewportChange()) {
document.styleResolverChanged(DeferRecalcStyle);
// FIXME: This instrumentation event is not strictly accurate since cached media query results do not persist across StyleResolver rebuilds.
InspectorInstrumentation::mediaQueryResultChanged(&document);
} else
document.evaluateMediaQueryList();
// If there is any pagination to apply, it will affect the RenderView's style, so we should
// take care of that now.
applyPaginationToViewport();
// Always ensure our style info is up-to-date. This can happen in situations where
// the layout beats any sort of style recalc update that needs to occur.
document.updateStyleIfNeeded();
m_layoutPhase = InPreLayout;
subtree = m_layoutRoot;
// If there is only one ref to this view left, then its going to be destroyed as soon as we exit,
// so there's no point to continuing to layout
if (hasOneRef())
return;
root = subtree ? m_layoutRoot : document.renderView();
if (!root) {
// FIXME: Do we need to set m_size here?
return;
}
// Close block here so we can set up the font cache purge preventer, which we will still
// want in scope even after we want m_layoutSchedulingEnabled to be restored again.
// The next block sets m_layoutSchedulingEnabled back to false once again.
}
FontCachePurgePreventer fontCachePurgePreventer;
RenderLayer* layer;
++m_nestedLayoutCount;
{
TemporaryChange<bool> changeSchedulingEnabled(m_layoutSchedulingEnabled, false);
if (!m_layoutRoot) {
HTMLElement* body = document.body();
if (body && body->renderer()) {
if (body->hasTagName(framesetTag) && !frameFlatteningEnabled()) {
body->renderer()->setChildNeedsLayout();
} else if (body->hasTagName(bodyTag)) {
if (!m_firstLayout && m_size.height() != layoutHeight() && body->renderer()->enclosingBox().stretchesToViewport())
body->renderer()->setChildNeedsLayout();
}
}
#ifdef INSTRUMENT_LAYOUT_SCHEDULING
if (m_firstLayout && !frame().ownerElement())
printf("Elapsed time before first layout: %lld\n", document.elapsedTime().count());
#endif
}
autoSizeIfEnabled();
m_needsFullRepaint = !subtree && (m_firstLayout || downcast<RenderView>(*root).printing());
if (!subtree) {
ScrollbarMode hMode;
ScrollbarMode vMode;
calculateScrollbarModesForLayout(hMode, vMode);
if (m_firstLayout || (hMode != horizontalScrollbarMode() || vMode != verticalScrollbarMode())) {
if (m_firstLayout) {
setScrollbarsSuppressed(true);
m_firstLayout = false;
m_firstLayoutCallbackPending = true;
m_lastViewportSize = sizeForResizeEvent();
m_lastZoomFactor = root->style().zoom();
// Set the initial vMode to AlwaysOn if we're auto.
if (vMode == ScrollbarAuto)
setVerticalScrollbarMode(ScrollbarAlwaysOn); // This causes a vertical scrollbar to appear.
// Set the initial hMode to AlwaysOff if we're auto.
if (hMode == ScrollbarAuto)
setHorizontalScrollbarMode(ScrollbarAlwaysOff); // This causes a horizontal scrollbar to disappear.
setScrollbarModes(hMode, vMode);
setScrollbarsSuppressed(false, true);
} else
setScrollbarModes(hMode, vMode);
}
LayoutSize oldSize = m_size;
m_size = layoutSize();
if (oldSize != m_size) {
m_needsFullRepaint = true;
if (!m_firstLayout) {
RenderBox* rootRenderer = document.documentElement() ? document.documentElement()->renderBox() : 0;
RenderBox* bodyRenderer = rootRenderer && document.body() ? document.body()->renderBox() : 0;
if (bodyRenderer && bodyRenderer->stretchesToViewport())
bodyRenderer->setChildNeedsLayout();
else if (rootRenderer && rootRenderer->stretchesToViewport())
rootRenderer->setChildNeedsLayout();
document.updateViewportUnitsOnResize();
}
}
m_layoutPhase = InPreLayout;
}
layer = root->enclosingLayer();
bool disableLayoutState = false;
if (subtree) {
disableLayoutState = root->view().shouldDisableLayoutStateForSubtree(root);
root->view().pushLayoutState(*root);
}
LayoutStateDisabler layoutStateDisabler(disableLayoutState ? &root->view() : 0);
RenderView::RepaintRegionAccumulator repaintRegionAccumulator(&root->view());
ASSERT(m_layoutPhase == InPreLayout);
m_layoutPhase = InLayout;
forceLayoutParentViewIfNeeded();
ASSERT(m_layoutPhase == InLayout);
root->layout();
#if ENABLE(IOS_TEXT_AUTOSIZING)
float minZoomFontSize = frame().settings().minimumZoomFontSize();
float visWidth = frame().page()->textAutosizingWidth();
if (minZoomFontSize && visWidth && !root->view().printing()) {
root->adjustComputedFontSizesOnBlocks(minZoomFontSize, visWidth);
bool needsLayout = root->needsLayout();
if (needsLayout)
root->layout();
}
#endif
#if ENABLE(TEXT_AUTOSIZING)
if (document.textAutosizer()->processSubtree(root) && root->needsLayout())
root->layout();
#endif
ASSERT(m_layoutPhase == InLayout);
if (subtree)
root->view().popLayoutState(*root);
m_layoutRoot = nullptr;
// Close block here to end the scope of changeSchedulingEnabled and layoutStateDisabler.
}
m_layoutPhase = InViewSizeAdjust;
bool neededFullRepaint = m_needsFullRepaint;
if (!subtree && !downcast<RenderView>(*root).printing())
adjustViewSize();
m_layoutPhase = InPostLayout;
m_needsFullRepaint = neededFullRepaint;
// Now update the positions of all layers.
if (m_needsFullRepaint)
root->view().repaintRootContents();
layer->updateLayerPositionsAfterLayout(renderView()->layer(), updateLayerPositionFlags(layer, subtree, m_needsFullRepaint));
updateCompositingLayersAfterLayout();
m_layoutCount++;
#if PLATFORM(COCOA) || PLATFORM(WIN) || PLATFORM(GTK) || PLATFORM(EFL)
if (AXObjectCache* cache = root->document().existingAXObjectCache())
cache->postNotification(root, AXObjectCache::AXLayoutComplete);
#endif
#if ENABLE(DASHBOARD_SUPPORT)
updateAnnotatedRegions();
#endif
#if ENABLE(IOS_TOUCH_EVENTS)
document.dirtyTouchEventRects();
#endif
ASSERT(!root->needsLayout());
updateCanBlitOnScrollRecursively();
if (document.hasListenerType(Document::OVERFLOWCHANGED_LISTENER))
updateOverflowStatus(layoutWidth() < contentsWidth(), layoutHeight() < contentsHeight());
if (!m_postLayoutTasksTimer.isActive()) {
if (!m_inSynchronousPostLayout) {
if (inChildFrameLayoutWithFrameFlattening)
updateWidgetPositions();
else {
TemporaryChange<bool> inSynchronousPostLayoutChange(m_inSynchronousPostLayout, true);
performPostLayoutTasks(); // Calls resumeScheduledEvents().
}
}
if (!m_postLayoutTasksTimer.isActive() && (needsLayout() || m_inSynchronousPostLayout || inChildFrameLayoutWithFrameFlattening)) {
// If we need layout or are already in a synchronous call to postLayoutTasks(),
// defer widget updates and event dispatch until after we return. postLayoutTasks()
// can make us need to update again, and we can get stuck in a nasty cycle unless
// we call it through the timer here.
m_postLayoutTasksTimer.startOneShot(0);
if (needsLayout())
layout();
}
}
InspectorInstrumentation::didLayout(cookie, root);
if (frame().isMainFrame())
DebugPageOverlays::didLayout(frame().mainFrame());
--m_nestedLayoutCount;
}
RenderBox* FrameView::embeddedContentBox() const
{
RenderView* renderView = this->renderView();
if (!renderView)
return nullptr;
RenderObject* firstChild = renderView->firstChild();
// Curently only embedded SVG documents participate in the size-negotiation logic.
if (is<RenderSVGRoot>(firstChild))
return downcast<RenderSVGRoot>(firstChild);
return nullptr;
}
void FrameView::addEmbeddedObjectToUpdate(RenderEmbeddedObject& embeddedObject)
{
if (!m_embeddedObjectsToUpdate)
m_embeddedObjectsToUpdate = std::make_unique<ListHashSet<RenderEmbeddedObject*>>();
HTMLFrameOwnerElement& element = embeddedObject.frameOwnerElement();
if (is<HTMLObjectElement>(element) || is<HTMLEmbedElement>(element)) {
// Tell the DOM element that it needs a widget update.
HTMLPlugInImageElement& pluginElement = downcast<HTMLPlugInImageElement>(element);
if (!pluginElement.needsCheckForSizeChange())
pluginElement.setNeedsWidgetUpdate(true);
}
m_embeddedObjectsToUpdate->add(&embeddedObject);
}
void FrameView::removeEmbeddedObjectToUpdate(RenderEmbeddedObject& embeddedObject)
{
if (!m_embeddedObjectsToUpdate)
return;
m_embeddedObjectsToUpdate->remove(&embeddedObject);
}
void FrameView::setMediaType(const String& mediaType)
{
m_mediaType = mediaType;
}
String FrameView::mediaType() const
{
// See if we have an override type.
String overrideType = frame().loader().client().overrideMediaType();
InspectorInstrumentation::applyEmulatedMedia(&frame(), &overrideType);
if (!overrideType.isNull())
return overrideType;
return m_mediaType;
}
void FrameView::adjustMediaTypeForPrinting(bool printing)
{
if (printing) {
if (m_mediaTypeWhenNotPrinting.isNull())
m_mediaTypeWhenNotPrinting = mediaType();
setMediaType("print");
} else {
if (!m_mediaTypeWhenNotPrinting.isNull())
setMediaType(m_mediaTypeWhenNotPrinting);
m_mediaTypeWhenNotPrinting = String();
}
}
bool FrameView::useSlowRepaints(bool considerOverlap) const
{
bool mustBeSlow = hasSlowRepaintObjects() || (platformWidget() && hasViewportConstrainedObjects());
// FIXME: WidgetMac.mm makes the assumption that useSlowRepaints ==
// m_contentIsOpaque, so don't take the fast path for composited layers
// if they are a platform widget in order to get painting correctness
// for transparent layers. See the comment in WidgetMac::paint.
if (contentsInCompositedLayer() && !platformWidget())
return mustBeSlow;
bool isOverlapped = m_isOverlapped && considerOverlap;
if (mustBeSlow || m_cannotBlitToWindow || isOverlapped || !m_contentIsOpaque)
return true;
if (FrameView* parentView = parentFrameView())
return parentView->useSlowRepaints(considerOverlap);
return false;
}
bool FrameView::useSlowRepaintsIfNotOverlapped() const
{
return useSlowRepaints(false);
}
void FrameView::updateCanBlitOnScrollRecursively()
{
for (Frame* frame = m_frame.get(); frame; frame = frame->tree().traverseNext(m_frame.get())) {
if (FrameView* view = frame->view())
view->setCanBlitOnScroll(!view->useSlowRepaints());
}
}
bool FrameView::contentsInCompositedLayer() const
{
RenderView* renderView = this->renderView();
if (renderView && renderView->isComposited()) {
GraphicsLayer* layer = renderView->layer()->backing()->graphicsLayer();
if (layer && layer->drawsContent())
return true;
}
return false;
}
void FrameView::setCannotBlitToWindow()
{
m_cannotBlitToWindow = true;
updateCanBlitOnScrollRecursively();
}
void FrameView::addSlowRepaintObject(RenderElement* o)
{
bool hadSlowRepaintObjects = hasSlowRepaintObjects();
if (!m_slowRepaintObjects)
m_slowRepaintObjects = std::make_unique<HashSet<RenderElement*>>();
m_slowRepaintObjects->add(o);
if (!hadSlowRepaintObjects) {
updateCanBlitOnScrollRecursively();
if (Page* page = frame().page()) {
if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
scrollingCoordinator->frameViewHasSlowRepaintObjectsDidChange(this);
}
}
}
void FrameView::removeSlowRepaintObject(RenderElement* o)
{
if (!m_slowRepaintObjects)
return;
m_slowRepaintObjects->remove(o);
if (m_slowRepaintObjects->isEmpty()) {
m_slowRepaintObjects = nullptr;
updateCanBlitOnScrollRecursively();
if (Page* page = frame().page()) {
if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
scrollingCoordinator->frameViewHasSlowRepaintObjectsDidChange(this);
}
}
}
void FrameView::addViewportConstrainedObject(RenderElement* object)
{
if (!m_viewportConstrainedObjects)
m_viewportConstrainedObjects = std::make_unique<ViewportConstrainedObjectSet>();
if (!m_viewportConstrainedObjects->contains(object)) {
m_viewportConstrainedObjects->add(object);
if (platformWidget())
updateCanBlitOnScrollRecursively();
if (Page* page = frame().page()) {
if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
scrollingCoordinator->frameViewFixedObjectsDidChange(this);
}
}
}
void FrameView::removeViewportConstrainedObject(RenderElement* object)
{
if (m_viewportConstrainedObjects && m_viewportConstrainedObjects->remove(object)) {
if (Page* page = frame().page()) {
if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
scrollingCoordinator->frameViewFixedObjectsDidChange(this);
}
// FIXME: In addFixedObject() we only call this if there's a platform widget,
// why isn't the same check being made here?
updateCanBlitOnScrollRecursively();
}
}
LayoutRect FrameView::viewportConstrainedVisibleContentRect() const
{
#if PLATFORM(IOS)
if (useCustomFixedPositionLayoutRect())
return customFixedPositionLayoutRect();
#endif
LayoutRect viewportRect = visibleContentRect();
viewportRect.setLocation(toLayoutPoint(scrollOffsetForFixedPosition()));
return viewportRect;
}
LayoutSize FrameView::scrollOffsetForFixedPosition(const LayoutRect& visibleContentRect, const LayoutSize& totalContentsSize, const LayoutPoint& scrollPosition, const LayoutPoint& scrollOrigin, float frameScaleFactor, bool fixedElementsLayoutRelativeToFrame, ScrollBehaviorForFixedElements behaviorForFixed, int headerHeight, int footerHeight)
{
LayoutPoint position;
if (behaviorForFixed == StickToDocumentBounds)
position = ScrollableArea::constrainScrollPositionForOverhang(visibleContentRect, totalContentsSize, scrollPosition, scrollOrigin, headerHeight, footerHeight);
else {
position = scrollPosition;
position.setY(position.y() - headerHeight);
}
LayoutSize maxSize = totalContentsSize - visibleContentRect.size();
float dragFactorX = (fixedElementsLayoutRelativeToFrame || !maxSize.width()) ? 1 : (totalContentsSize.width() - visibleContentRect.width() * frameScaleFactor) / maxSize.width();
float dragFactorY = (fixedElementsLayoutRelativeToFrame || !maxSize.height()) ? 1 : (totalContentsSize.height() - visibleContentRect.height() * frameScaleFactor) / maxSize.height();
return LayoutSize(position.x() * dragFactorX / frameScaleFactor, position.y() * dragFactorY / frameScaleFactor);
}
LayoutSize FrameView::scrollOffsetForFixedPosition() const
{
IntRect visibleContentRect = this->visibleContentRect();
IntSize totalContentsSize = this->totalContentsSize();
IntPoint scrollPosition = this->scrollPosition();
IntPoint scrollOrigin = this->scrollOrigin();
float frameScaleFactor = frame().frameScaleFactor();
ScrollBehaviorForFixedElements behaviorForFixed = scrollBehaviorForFixedElements();
return scrollOffsetForFixedPosition(visibleContentRect, totalContentsSize, scrollPosition, scrollOrigin, frameScaleFactor, fixedElementsLayoutRelativeToFrame(), behaviorForFixed, headerHeight(), footerHeight());
}
float FrameView::yPositionForInsetClipLayer(const FloatPoint& scrollPosition, float topContentInset)
{
if (!topContentInset)
return 0;
// The insetClipLayer should not move for negative scroll values.
float scrollY = std::max<float>(0, scrollPosition.y());
if (scrollY >= topContentInset)
return 0;
return topContentInset - scrollY;
}
float FrameView::yPositionForHeaderLayer(const FloatPoint& scrollPosition, float topContentInset)
{
if (!topContentInset)
return 0;
float scrollY = std::max<float>(0, scrollPosition.y());
if (scrollY >= topContentInset)
return topContentInset;
return scrollY;
}
float FrameView::yPositionForRootContentLayer(const FloatPoint& scrollPosition, float topContentInset, float headerHeight)
{
return yPositionForHeaderLayer(scrollPosition, topContentInset) + headerHeight;
}
float FrameView::yPositionForFooterLayer(const FloatPoint& scrollPosition, float topContentInset, float totalContentsHeight, float footerHeight)
{
return yPositionForHeaderLayer(scrollPosition, topContentInset) + totalContentsHeight - footerHeight;
}
#if PLATFORM(IOS)
LayoutRect FrameView::rectForViewportConstrainedObjects(const LayoutRect& visibleContentRect, const LayoutSize& totalContentsSize, float frameScaleFactor, bool fixedElementsLayoutRelativeToFrame, ScrollBehaviorForFixedElements scrollBehavior)
{
if (fixedElementsLayoutRelativeToFrame)
return visibleContentRect;
if (totalContentsSize.isEmpty())
return visibleContentRect;
// We impose an lower limit on the size (so an upper limit on the scale) of
// the rect used to position fixed objects so that they don't crowd into the
// center of the screen at larger scales.
const LayoutUnit maxContentWidthForZoomThreshold = LayoutUnit::fromPixel(1024);
float zoomedOutScale = frameScaleFactor * visibleContentRect.width() / std::min(maxContentWidthForZoomThreshold, totalContentsSize.width());
float constraintThresholdScale = 1.5 * zoomedOutScale;
float maxPostionedObjectsRectScale = std::min(frameScaleFactor, constraintThresholdScale);
LayoutRect viewportConstrainedObjectsRect = visibleContentRect;
if (frameScaleFactor > constraintThresholdScale) {
FloatRect contentRect(FloatPoint(), totalContentsSize);
FloatRect viewportRect = visibleContentRect;
// Scale the rect up from a point that is relative to its position in the viewport.
FloatSize sizeDelta = contentRect.size() - viewportRect.size();
FloatPoint scaleOrigin;
scaleOrigin.setX(contentRect.x() + sizeDelta.width() > 0 ? contentRect.width() * (viewportRect.x() - contentRect.x()) / sizeDelta.width() : 0);
scaleOrigin.setY(contentRect.y() + sizeDelta.height() > 0 ? contentRect.height() * (viewportRect.y() - contentRect.y()) / sizeDelta.height() : 0);
AffineTransform rescaleTransform = AffineTransform::translation(scaleOrigin.x(), scaleOrigin.y());
rescaleTransform.scale(frameScaleFactor / maxPostionedObjectsRectScale, frameScaleFactor / maxPostionedObjectsRectScale);
rescaleTransform = CGAffineTransformTranslate(rescaleTransform, -scaleOrigin.x(), -scaleOrigin.y());
viewportConstrainedObjectsRect = enclosingLayoutRect(rescaleTransform.mapRect(visibleContentRect));
}
if (scrollBehavior == StickToDocumentBounds) {
LayoutRect documentBounds(LayoutPoint(), totalContentsSize);
viewportConstrainedObjectsRect.intersect(documentBounds);
}
return viewportConstrainedObjectsRect;
}
LayoutRect FrameView::viewportConstrainedObjectsRect() const
{
return rectForViewportConstrainedObjects(visibleContentRect(), totalContentsSize(), frame().frameScaleFactor(), fixedElementsLayoutRelativeToFrame(), scrollBehaviorForFixedElements());
}
#endif
IntPoint FrameView::minimumScrollPosition() const
{
IntPoint minimumPosition(ScrollView::minimumScrollPosition());
if (frame().isMainFrame() && m_scrollPinningBehavior == PinToBottom)
minimumPosition.setY(maximumScrollPosition().y());
return minimumPosition;
}
IntPoint FrameView::maximumScrollPosition() const
{
IntPoint maximumOffset(contentsWidth() - visibleWidth() - scrollOrigin().x(), totalContentsSize().height() - visibleHeight() - scrollOrigin().y());
maximumOffset.clampNegativeToZero();
if (frame().isMainFrame() && m_scrollPinningBehavior == PinToTop)
maximumOffset.setY(minimumScrollPosition().y());
return maximumOffset;
}
void FrameView::delayedScrollEventTimerFired()
{
sendScrollEvent();
}
bool FrameView::fixedElementsLayoutRelativeToFrame() const
{
return frame().settings().fixedElementsLayoutRelativeToFrame();
}
IntPoint FrameView::lastKnownMousePosition() const
{
return frame().eventHandler().lastKnownMousePosition();
}
bool FrameView::isHandlingWheelEvent() const
{
return frame().eventHandler().isHandlingWheelEvent();
}
bool FrameView::shouldSetCursor() const
{
Page* page = frame().page();
return page && page->isVisible() && page->focusController().isActive();
}
bool FrameView::scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect)
{
if (!m_viewportConstrainedObjects || m_viewportConstrainedObjects->isEmpty()) {
hostWindow()->scroll(scrollDelta, rectToScroll, clipRect);
return true;
}
const bool isCompositedContentLayer = contentsInCompositedLayer();
// Get the rects of the fixed objects visible in the rectToScroll
Region regionToUpdate;
for (auto& renderer : *m_viewportConstrainedObjects) {
if (!renderer->style().hasViewportConstrainedPosition())
continue;
if (renderer->isComposited())
continue;
// Fixed items should always have layers.
ASSERT(renderer->hasLayer());
RenderLayer* layer = downcast<RenderBoxModelObject>(*renderer).layer();
if (layer->viewportConstrainedNotCompositedReason() == RenderLayer::NotCompositedForBoundsOutOfView
|| layer->viewportConstrainedNotCompositedReason() == RenderLayer::NotCompositedForNoVisibleContent) {
// Don't invalidate for invisible fixed layers.
continue;
}
if (layer->hasAncestorWithFilterOutsets()) {
// If the fixed layer has a blur/drop-shadow filter applied on at least one of its parents, we cannot
// scroll using the fast path, otherwise the outsets of the filter will be moved around the page.
return false;
}
// FIXME: use pixel snapping instead of enclosing when ScrollView has finished transitioning from IntRect to Float/LayoutRect.
IntRect updateRect = enclosingIntRect(layer->repaintRectIncludingNonCompositingDescendants());
updateRect = contentsToRootView(updateRect);
if (!isCompositedContentLayer && clipsRepaints())
updateRect.intersect(rectToScroll);
if (!updateRect.isEmpty())
regionToUpdate.unite(updateRect);
}
// 1) scroll
hostWindow()->scroll(scrollDelta, rectToScroll, clipRect);
// 2) update the area of fixed objects that has been invalidated
Vector<IntRect> subRectsToUpdate = regionToUpdate.rects();
size_t viewportConstrainedObjectsCount = subRectsToUpdate.size();
for (size_t i = 0; i < viewportConstrainedObjectsCount; ++i) {
IntRect updateRect = subRectsToUpdate[i];
IntRect scrolledRect = updateRect;
scrolledRect.move(scrollDelta);
updateRect.unite(scrolledRect);
if (isCompositedContentLayer) {
updateRect = rootViewToContents(updateRect);
ASSERT(renderView());
renderView()->layer()->setBackingNeedsRepaintInRect(updateRect);
continue;
}
if (clipsRepaints())
updateRect.intersect(rectToScroll);
hostWindow()->invalidateContentsAndRootView(updateRect);
}
return true;
}
void FrameView::scrollContentsSlowPath(const IntRect& updateRect)
{
if (contentsInCompositedLayer()) {
// FIXME: respect paintsEntireContents()?
IntRect updateRect = visibleContentRect(LegacyIOSDocumentVisibleRect);
// Make sure to "apply" the scale factor here since we're converting from frame view
// coordinates to layer backing coordinates.
updateRect.scale(1 / frame().frameScaleFactor());
ASSERT(renderView());
renderView()->layer()->setBackingNeedsRepaintInRect(updateRect, GraphicsLayer::DoNotClipToLayer);
}
repaintSlowRepaintObjects();
if (RenderWidget* frameRenderer = frame().ownerRenderer()) {
if (isEnclosedInCompositingLayer()) {
LayoutRect rect(frameRenderer->borderLeft() + frameRenderer->paddingLeft(),
frameRenderer->borderTop() + frameRenderer->paddingTop(),
visibleWidth(), visibleHeight());
frameRenderer->repaintRectangle(rect);
return;
}
}
ScrollView::scrollContentsSlowPath(updateRect);
}
void FrameView::repaintSlowRepaintObjects()
{
if (!m_slowRepaintObjects)
return;
// Renderers with fixed backgrounds may be in compositing layers, so we need to explicitly
// repaint them after scrolling.
for (auto& renderer : *m_slowRepaintObjects)
renderer->repaintSlowRepaintObject();
}
// Note that this gets called at painting time.
void FrameView::setIsOverlapped(bool isOverlapped)
{
if (isOverlapped == m_isOverlapped)
return;
m_isOverlapped = isOverlapped;
updateCanBlitOnScrollRecursively();
if (hasCompositedContentIncludingDescendants()) {
// Overlap can affect compositing tests, so if it changes, we need to trigger
// a layer update in the parent document.
if (Frame* parentFrame = frame().tree().parent()) {
if (RenderView* parentView = parentFrame->contentRenderer()) {
RenderLayerCompositor& compositor = parentView->compositor();
compositor.setCompositingLayersNeedRebuild();
compositor.scheduleCompositingLayerUpdate();
}
}
if (RenderLayerCompositor::allowsIndependentlyCompositedFrames(this)) {
// We also need to trigger reevaluation for this and all descendant frames,
// since a frame uses compositing if any ancestor is compositing.
for (Frame* frame = m_frame.get(); frame; frame = frame->tree().traverseNext(m_frame.get())) {
if (RenderView* view = frame->contentRenderer()) {
RenderLayerCompositor& compositor = view->compositor();
compositor.setCompositingLayersNeedRebuild();
compositor.scheduleCompositingLayerUpdate();
}
}
}
}
}
bool FrameView::isOverlappedIncludingAncestors() const
{
if (isOverlapped())
return true;
if (FrameView* parentView = parentFrameView()) {
if (parentView->isOverlapped())
return true;
}
return false;
}
void FrameView::setContentIsOpaque(bool contentIsOpaque)
{
if (contentIsOpaque == m_contentIsOpaque)
return;
m_contentIsOpaque = contentIsOpaque;
updateCanBlitOnScrollRecursively();
}
void FrameView::restoreScrollbar()
{
setScrollbarsSuppressed(false);
}
bool FrameView::scrollToFragment(const URL& url)
{
// If our URL has no ref, then we have no place we need to jump to.
// OTOH If CSS target was set previously, we want to set it to 0, recalc
// and possibly repaint because :target pseudo class may have been
// set (see bug 11321).
if (!url.hasFragmentIdentifier() && !frame().document()->cssTarget())
return false;
String fragmentIdentifier = url.fragmentIdentifier();
if (scrollToAnchor(fragmentIdentifier))
return true;
// Try again after decoding the ref, based on the document's encoding.
if (TextResourceDecoder* decoder = frame().document()->decoder())
return scrollToAnchor(decodeURLEscapeSequences(fragmentIdentifier, decoder->encoding()));
return false;
}
bool FrameView::scrollToAnchor(const String& name)
{
ASSERT(frame().document());
if (!frame().document()->haveStylesheetsLoaded()) {
frame().document()->setGotoAnchorNeededAfterStylesheetsLoad(true);
return false;
}
frame().document()->setGotoAnchorNeededAfterStylesheetsLoad(false);
Element* anchorElement = frame().document()->findAnchor(name);
// Setting to null will clear the current target.
frame().document()->setCSSTarget(anchorElement);
if (is<SVGDocument>(*frame().document())) {
if (SVGSVGElement* svg = downcast<SVGDocument>(*frame().document()).rootElement()) {
svg->setupInitialView(name, anchorElement);
if (!anchorElement)
return true;
}
}
// Implement the rule that "" and "top" both mean top of page as in other browsers.
if (!anchorElement && !(name.isEmpty() || equalIgnoringCase(name, "top")))
return false;
ContainerNode* scrollPositionAnchor = anchorElement;
if (!scrollPositionAnchor)
scrollPositionAnchor = frame().document();
maintainScrollPositionAtAnchor(scrollPositionAnchor);
// If the anchor accepts keyboard focus, move focus there to aid users relying on keyboard navigation.
if (anchorElement && anchorElement->isFocusable())
frame().document()->setFocusedElement(anchorElement);
return true;
}
void FrameView::maintainScrollPositionAtAnchor(ContainerNode* anchorNode)
{
m_maintainScrollPositionAnchor = anchorNode;
if (!m_maintainScrollPositionAnchor)
return;
// We need to update the layout before scrolling, otherwise we could
// really mess things up if an anchor scroll comes at a bad moment.
frame().document()->updateStyleIfNeeded();
// Only do a layout if changes have occurred that make it necessary.
RenderView* renderView = this->renderView();
if (renderView && renderView->needsLayout())
layout();
else
scrollToAnchor();
}
void FrameView::scrollElementToRect(Element* element, const IntRect& rect)
{
frame().document()->updateLayoutIgnorePendingStylesheets();
LayoutRect bounds = rendererAnchorRect(*element);
int centeringOffsetX = (rect.width() - bounds.width()) / 2;
int centeringOffsetY = (rect.height() - bounds.height()) / 2;
setScrollPosition(IntPoint(bounds.x() - centeringOffsetX - rect.x(), bounds.y() - centeringOffsetY - rect.y()));
}
void FrameView::setScrollPosition(const IntPoint& scrollPoint)
{
TemporaryChange<bool> changeInProgrammaticScroll(m_inProgrammaticScroll, true);
m_maintainScrollPositionAnchor = nullptr;
ScrollView::setScrollPosition(scrollPoint);
}
void FrameView::delegatesScrollingDidChange()
{
// When we switch to delgatesScrolling mode, we should destroy the scrolling/clipping layers in RenderLayerCompositor.
if (hasCompositedContent())
clearBackingStores();
}
#if USE(TILED_BACKING_STORE)
void FrameView::setFixedVisibleContentRect(const IntRect& visibleContentRect)
{
bool visibleContentSizeDidChange = false;
if (visibleContentRect.size() != this->fixedVisibleContentRect().size()) {
// When the viewport size changes or the content is scaled, we need to
// reposition the fixed and sticky positioned elements.
setViewportConstrainedObjectsNeedLayout();
visibleContentSizeDidChange = true;
}
IntSize offset = scrollOffset();
IntPoint oldPosition = scrollPosition();
ScrollView::setFixedVisibleContentRect(visibleContentRect);
if (offset != scrollOffset()) {
updateLayerPositionsAfterScrolling();
if (frame().page()->settings().acceleratedCompositingForFixedPositionEnabled())
updateCompositingLayersAfterScrolling();
IntPoint newPosition = scrollPosition();
scrollAnimator()->setCurrentPosition(scrollPosition());
scrollPositionChanged(oldPosition, newPosition);
}
if (visibleContentSizeDidChange) {
// Update the scroll-bars to calculate new page-step size.
updateScrollbars(scrollOffset());
}
didChangeScrollOffset();
}
#endif
void FrameView::setViewportConstrainedObjectsNeedLayout()
{
if (!hasViewportConstrainedObjects())
return;
for (auto& renderer : *m_viewportConstrainedObjects)
renderer->setNeedsLayout();
}
void FrameView::didChangeScrollOffset()
{
frame().mainFrame().pageOverlayController().didScrollFrame(frame());
frame().loader().client().didChangeScrollOffset();
}
void FrameView::scrollPositionChangedViaPlatformWidget(const IntPoint& oldPosition, const IntPoint& newPosition)
{
updateLayerPositionsAfterScrolling();
updateCompositingLayersAfterScrolling();
repaintSlowRepaintObjects();
scrollPositionChanged(oldPosition, newPosition);
}
void FrameView::scrollPositionChanged(const IntPoint& oldPosition, const IntPoint& newPosition)
{
std::chrono::milliseconds throttlingDelay = frame().page()->chrome().client().eventThrottlingDelay();
if (throttlingDelay == std::chrono::milliseconds::zero()) {
m_delayedScrollEventTimer.stop();
sendScrollEvent();
} else if (!m_delayedScrollEventTimer.isActive())
m_delayedScrollEventTimer.startOneShot(throttlingDelay);
if (Document* document = frame().document())
document->sendWillRevealEdgeEventsIfNeeded(oldPosition, newPosition, visibleContentRect(), contentsSize());
if (RenderView* renderView = this->renderView()) {
if (renderView->usesCompositing())
renderView->compositor().frameViewDidScroll();
}
resumeVisibleImageAnimationsIncludingSubframes();
updateThrottledDOMTimersState();
}
void FrameView::resumeVisibleImageAnimationsIncludingSubframes()
{
// A change in scroll position may affect image visibility in subframes.
for (auto* frame = m_frame.get(); frame; frame = frame->tree().traverseNext(m_frame.get())) {
if (auto* renderView = frame->contentRenderer())
renderView->resumePausedImageAnimationsIfNeeded();
}
}
void FrameView::updateLayerPositionsAfterScrolling()
{
// If we're scrolling as a result of updating the view size after layout, we'll update widgets and layer positions soon anyway.
if (m_layoutPhase == InViewSizeAdjust)
return;
if (m_nestedLayoutCount <= 1 && hasViewportConstrainedObjects()) {
if (RenderView* renderView = this->renderView()) {
updateWidgetPositions();
renderView->layer()->updateLayerPositionsAfterDocumentScroll();
}
}
}
bool FrameView::shouldUpdateCompositingLayersAfterScrolling() const
{
#if ENABLE(ASYNC_SCROLLING)
// If the scrolling thread is updating the fixed elements, then the FrameView should not update them as well.
Page* page = frame().page();
if (!page)
return true;
if (&page->mainFrame() != &frame())
return true;
ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator();
if (!scrollingCoordinator)
return true;
if (!scrollingCoordinator->supportsFixedPositionLayers())
return true;
if (scrollingCoordinator->shouldUpdateScrollLayerPositionSynchronously())
return true;
if (inProgrammaticScroll())
return true;
return false;
#endif
return true;
}
void FrameView::updateCompositingLayersAfterScrolling()
{
if (!shouldUpdateCompositingLayersAfterScrolling())
return;
if (m_nestedLayoutCount <= 1 && hasViewportConstrainedObjects()) {
if (RenderView* renderView = this->renderView())
renderView->compositor().updateCompositingLayers(CompositingUpdateOnScroll);
}
}
bool FrameView::isRubberBandInProgress() const
{
if (scrollbarsSuppressed())
return false;
// If the scrolling thread updates the scroll position for this FrameView, then we should return
// ScrollingCoordinator::isRubberBandInProgress().
if (Page* page = frame().page()) {
if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator()) {
if (!scrollingCoordinator->shouldUpdateScrollLayerPositionSynchronously())
return scrollingCoordinator->isRubberBandInProgress();
}
}
// If the main thread updates the scroll position for this FrameView, we should return
// ScrollAnimator::isRubberBandInProgress().
if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
return scrollAnimator->isRubberBandInProgress();
return false;
}
bool FrameView::requestScrollPositionUpdate(const IntPoint& position)
{
#if ENABLE(ASYNC_SCROLLING)
if (TiledBacking* tiledBacking = this->tiledBacking())
tiledBacking->prepopulateRect(FloatRect(position, visibleContentRect().size()));
#endif
#if ENABLE(ASYNC_SCROLLING) || USE(TILED_BACKING_STORE)
if (Page* page = frame().page()) {
if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
return scrollingCoordinator->requestScrollPositionUpdate(this, position);
}
#else
UNUSED_PARAM(position);
#endif
return false;
}
HostWindow* FrameView::hostWindow() const
{
if (Page* page = frame().page())
return &page->chrome();
return 0;
}
void FrameView::addTrackedRepaintRect(const FloatRect& r)
{
if (!m_isTrackingRepaints || r.isEmpty())
return;
FloatRect repaintRect = r;
repaintRect.move(-scrollOffset());
m_trackedRepaintRects.append(repaintRect);
}
void FrameView::repaintContentRectangle(const IntRect& r)
{
ASSERT(!frame().ownerElement());
if (!shouldUpdate())
return;
ScrollView::repaintContentRectangle(r);
}
static unsigned countRenderedCharactersInRenderObjectWithThreshold(const RenderElement& renderer, unsigned threshold)
{
unsigned count = 0;
for (const RenderObject* descendant = &renderer; descendant; descendant = descendant->nextInPreOrder()) {
if (is<RenderText>(*descendant)) {
count += downcast<RenderText>(*descendant).text()->length();
if (count >= threshold)
break;
}
}
return count;
}
bool FrameView::renderedCharactersExceed(unsigned threshold)
{
if (!m_frame->contentRenderer())
return false;
return countRenderedCharactersInRenderObjectWithThreshold(*m_frame->contentRenderer(), threshold) >= threshold;
}
void FrameView::contentsResized()
{
ScrollView::contentsResized();
setNeedsLayout();
}
void FrameView::fixedLayoutSizeChanged()
{
// Can be triggered before the view is set, see comment in FrameView::visibleContentsResized().
// An ASSERT is triggered when a view schedules a layout before being attached to a frame.
if (!frame().view())
return;
ScrollView::fixedLayoutSizeChanged();
}
bool FrameView::shouldLayoutAfterContentsResized() const
{
return !useFixedLayout() || useCustomFixedPositionLayoutRect();
}
void FrameView::visibleContentsResized()
{
// We check to make sure the view is attached to a frame() as this method can
// be triggered before the view is attached by Frame::createView(...) setting
// various values such as setScrollBarModes(...) for example. An ASSERT is
// triggered when a view is layout before being attached to a frame().
if (!frame().view())
return;
#if PLATFORM(IOS)
if (RenderView* root = m_frame->contentRenderer()) {
if (useCustomFixedPositionLayoutRect() && hasViewportConstrainedObjects()) {
setViewportConstrainedObjectsNeedLayout();
// We must eagerly enter compositing mode because fixed position elements
// will not have been made compositing via a preceding style change before
// m_useCustomFixedPositionLayoutRect was true.
root->compositor().enableCompositingMode();
}
}
#endif
if (shouldLayoutAfterContentsResized() && needsLayout())
layout();
if (RenderView* renderView = this->renderView()) {
if (renderView->usesCompositing())
renderView->compositor().frameViewDidChangeSize();
}
}
void FrameView::addedOrRemovedScrollbar()
{
if (RenderView* renderView = this->renderView()) {
if (renderView->usesCompositing())
renderView->compositor().frameViewDidAddOrRemoveScrollbars();
}
}
static LayerFlushThrottleState::Flags determineLayerFlushThrottleState(Page& page)
{
// We only throttle when constantly receiving new data during the inital page load.
if (!page.progress().isMainLoadProgressing())
return 0;
// Scrolling during page loading disables throttling.
if (page.mainFrame().view()->wasScrolledByUser())
return 0;
// Disable for image documents so large GIF animations don't get throttled during loading.
auto* document = page.mainFrame().document();
if (!document || is<ImageDocument>(*document))
return 0;
return LayerFlushThrottleState::Enabled;
}
void FrameView::disableLayerFlushThrottlingTemporarilyForInteraction()
{
if (!frame().page())
return;
auto& page = *frame().page();
LayerFlushThrottleState::Flags flags = LayerFlushThrottleState::UserIsInteracting | determineLayerFlushThrottleState(page);
if (page.chrome().client().adjustLayerFlushThrottling(flags))
return;
if (RenderView* view = renderView())
view->compositor().disableLayerFlushThrottlingTemporarilyForInteraction();
}
void FrameView::loadProgressingStatusChanged()
{
updateLayerFlushThrottling();
adjustTiledBackingCoverage();
}
void FrameView::updateLayerFlushThrottling()
{
ASSERT(frame().isMainFrame());
auto& page = *frame().page();
LayerFlushThrottleState::Flags flags = determineLayerFlushThrottleState(page);
// See if the client is handling throttling.
if (page.chrome().client().adjustLayerFlushThrottling(flags))
return;
for (Frame* frame = m_frame.get(); frame; frame = frame->tree().traverseNext(m_frame.get())) {
if (RenderView* renderView = frame->contentRenderer())
renderView->compositor().setLayerFlushThrottlingEnabled(flags & LayerFlushThrottleState::Enabled);
}
}
void FrameView::adjustTiledBackingCoverage()
{
if (!m_speculativeTilingEnabled)
enableSpeculativeTilingIfNeeded();
RenderView* renderView = this->renderView();
if (renderView && renderView->layer()->backing())
renderView->layer()->backing()->adjustTiledBackingCoverage();
#if PLATFORM(IOS)
if (LegacyTileCache* tileCache = legacyTileCache())
tileCache->setSpeculativeTileCreationEnabled(m_speculativeTilingEnabled);
#endif
}
static bool shouldEnableSpeculativeTilingDuringLoading(const FrameView& view)
{
return view.isVisuallyNonEmpty() && !view.frame().page()->progress().isMainLoadProgressing();
}
void FrameView::enableSpeculativeTilingIfNeeded()
{
ASSERT(!m_speculativeTilingEnabled);
if (m_wasScrolledByUser) {
m_speculativeTilingEnabled = true;
return;
}
if (!shouldEnableSpeculativeTilingDuringLoading(*this))
return;
if (m_speculativeTilingEnableTimer.isActive())
return;
// Delay enabling a bit as load completion may trigger further loading from scripts.
static const double speculativeTilingEnableDelay = 0.5;
m_speculativeTilingEnableTimer.startOneShot(speculativeTilingEnableDelay);
}
void FrameView::speculativeTilingEnableTimerFired()
{
if (m_speculativeTilingEnabled)
return;
m_speculativeTilingEnabled = shouldEnableSpeculativeTilingDuringLoading(*this);
adjustTiledBackingCoverage();
}
void FrameView::layoutTimerFired()
{
#ifdef INSTRUMENT_LAYOUT_SCHEDULING
if (!frame().document()->ownerElement())
printf("Layout timer fired at %lld\n", frame().document()->elapsedTime().count());
#endif
layout();
}
void FrameView::scheduleRelayout()
{
// FIXME: We should assert the page is not in the page cache, but that is causing
// too many false assertions. See <rdar://problem/7218118>.
ASSERT(frame().view() == this);
if (m_layoutRoot) {
m_layoutRoot->markContainingBlocksForLayout(false);
m_layoutRoot = 0;
}
if (!m_layoutSchedulingEnabled)
return;
if (!needsLayout())
return;
if (!frame().document()->shouldScheduleLayout())
return;
InspectorInstrumentation::didInvalidateLayout(&frame());
// When frame flattening is enabled, the contents of the frame could affect the layout of the parent frames.
// Also invalidate parent frame starting from the owner element of this frame.
if (frame().ownerRenderer() && isInChildFrameWithFrameFlattening())
frame().ownerRenderer()->setNeedsLayout(MarkContainingBlockChain);
std::chrono::milliseconds delay = frame().document()->minimumLayoutDelay();
if (m_layoutTimer.isActive() && m_delayedLayout && !delay.count())
unscheduleRelayout();
if (m_layoutTimer.isActive())
return;
m_delayedLayout = delay.count();
#ifdef INSTRUMENT_LAYOUT_SCHEDULING
if (!frame().document()->ownerElement())
printf("Scheduling layout for %d\n", delay);
#endif
m_layoutTimer.startOneShot(delay);
}
static bool isObjectAncestorContainerOf(RenderObject* ancestor, RenderObject* descendant)
{
for (RenderObject* r = descendant; r; r = r->container()) {
if (r == ancestor)
return true;
}
return false;
}
void FrameView::scheduleRelayoutOfSubtree(RenderElement& newRelayoutRoot)
{
ASSERT(renderView());
RenderView& renderView = *this->renderView();
// Try to catch unnecessary work during render tree teardown.
ASSERT(!renderView.documentBeingDestroyed());
ASSERT(frame().view() == this);
if (renderView.needsLayout()) {
newRelayoutRoot.markContainingBlocksForLayout(false);
return;
}
if (!layoutPending() && m_layoutSchedulingEnabled) {
std::chrono::milliseconds delay = renderView.document().minimumLayoutDelay();
ASSERT(!newRelayoutRoot.container() || !newRelayoutRoot.container()->needsLayout());
m_layoutRoot = &newRelayoutRoot;
InspectorInstrumentation::didInvalidateLayout(&frame());
m_delayedLayout = delay.count();
m_layoutTimer.startOneShot(delay);
return;
}
if (m_layoutRoot == &newRelayoutRoot)
return;
if (!m_layoutRoot) {
// Just relayout the subtree.
newRelayoutRoot.markContainingBlocksForLayout(false);
InspectorInstrumentation::didInvalidateLayout(&frame());
return;
}
if (isObjectAncestorContainerOf(m_layoutRoot, &newRelayoutRoot)) {
// Keep the current root.
newRelayoutRoot.markContainingBlocksForLayout(false, m_layoutRoot);
ASSERT(!m_layoutRoot->container() || !m_layoutRoot->container()->needsLayout());
return;
}
if (isObjectAncestorContainerOf(&newRelayoutRoot, m_layoutRoot)) {
// Re-root at newRelayoutRoot.
m_layoutRoot->markContainingBlocksForLayout(false, &newRelayoutRoot);
m_layoutRoot = &newRelayoutRoot;
ASSERT(!m_layoutRoot->container() || !m_layoutRoot->container()->needsLayout());
InspectorInstrumentation::didInvalidateLayout(&frame());
return;
}
// Just do a full relayout.
m_layoutRoot->markContainingBlocksForLayout(false);
m_layoutRoot = 0;
newRelayoutRoot.markContainingBlocksForLayout(false);
InspectorInstrumentation::didInvalidateLayout(&frame());
}
bool FrameView::layoutPending() const
{
return m_layoutTimer.isActive();
}
bool FrameView::needsLayout() const
{
// This can return true in cases where the document does not have a body yet.
// Document::shouldScheduleLayout takes care of preventing us from scheduling
// layout in that case.
RenderView* renderView = this->renderView();
return layoutPending()
|| (renderView && renderView->needsLayout())
|| m_layoutRoot
|| (m_deferSetNeedsLayouts && m_setNeedsLayoutWasDeferred);
}
void FrameView::setNeedsLayout()
{
if (m_deferSetNeedsLayouts) {
m_setNeedsLayoutWasDeferred = true;
return;
}
if (RenderView* renderView = this->renderView())
renderView->setNeedsLayout();
}
void FrameView::unscheduleRelayout()
{
if (!m_layoutTimer.isActive())
return;
#ifdef INSTRUMENT_LAYOUT_SCHEDULING
if (!frame().document()->ownerElement())
printf("Layout timer unscheduled at %d\n", frame().document()->elapsedTime());
#endif
m_layoutTimer.stop();
m_delayedLayout = false;
}
#if ENABLE(REQUEST_ANIMATION_FRAME)
void FrameView::serviceScriptedAnimations(double monotonicAnimationStartTime)
{
for (Frame* frame = m_frame.get(); frame; frame = frame->tree().traverseNext()) {
frame->view()->serviceScrollAnimations();
frame->animation().serviceAnimations();
}
Vector<RefPtr<Document>> documents;
for (Frame* frame = m_frame.get(); frame; frame = frame->tree().traverseNext())
documents.append(frame->document());
for (size_t i = 0; i < documents.size(); ++i)
documents[i]->serviceScriptedAnimations(monotonicAnimationStartTime);
}
#endif
bool FrameView::isTransparent() const
{
return m_isTransparent;
}
void FrameView::setTransparent(bool isTransparent)
{
if (m_isTransparent == isTransparent)
return;
m_isTransparent = isTransparent;
RenderView* renderView = this->renderView();
if (!renderView)
return;
// setTransparent can be called in the window between FrameView initialization
// and switching in the new Document; this means that the RenderView that we
// retrieve is actually attached to the previous Document, which is going away,
// and must not update compositing layers.
if (&renderView->frameView() != this)
return;
RenderLayerCompositor& compositor = renderView->compositor();
compositor.setCompositingLayersNeedRebuild();
compositor.scheduleCompositingLayerUpdate();
}
bool FrameView::hasOpaqueBackground() const
{
return !m_isTransparent && !m_baseBackgroundColor.hasAlpha();
}
Color FrameView::baseBackgroundColor() const
{
return m_baseBackgroundColor;
}
void FrameView::setBaseBackgroundColor(const Color& backgroundColor)
{
if (!backgroundColor.isValid())
m_baseBackgroundColor = Color::white;
else
m_baseBackgroundColor = backgroundColor;
recalculateScrollbarOverlayStyle();
}
void FrameView::updateBackgroundRecursively(const Color& backgroundColor, bool transparent)
{
for (Frame* frame = m_frame.get(); frame; frame = frame->tree().traverseNext(m_frame.get())) {
if (FrameView* view = frame->view()) {
view->setTransparent(transparent);
view->setBaseBackgroundColor(backgroundColor);
}
}
}
bool FrameView::hasExtendedBackgroundRectForPainting() const
{
if (!frame().settings().backgroundShouldExtendBeyondPage())
return false;
TiledBacking* tiledBacking = this->tiledBacking();
if (!tiledBacking)
return false;
return tiledBacking->hasMargins();
}
void FrameView::updateExtendBackgroundIfNecessary()
{
ExtendedBackgroundMode mode = calculateExtendedBackgroundMode();
if (mode == ExtendedBackgroundModeNone)
return;
updateTilesForExtendedBackgroundMode(mode);
}
FrameView::ExtendedBackgroundMode FrameView::calculateExtendedBackgroundMode() const
{
// Just because Settings::backgroundShouldExtendBeyondPage() is true does not necessarily mean
// that the background rect needs to be extended for painting. Simple backgrounds can be extended
// just with RenderLayerCompositor::setRootExtendedBackgroundColor(). More complicated backgrounds,
// such as images, require extending the background rect to continue painting into the extended
// region. This function finds out if it is necessary to extend the background rect for painting.
#if PLATFORM(IOS)
// <rdar://problem/16201373>
return ExtendedBackgroundModeNone;
#endif
if (!frame().settings().backgroundShouldExtendBeyondPage())
return ExtendedBackgroundModeNone;
if (!frame().isMainFrame())
return ExtendedBackgroundModeNone;
Document* document = frame().document();
if (!document)
return ExtendedBackgroundModeNone;
auto documentElement = document->documentElement();
auto documentElementRenderer = documentElement ? documentElement->renderer() : nullptr;
if (!documentElementRenderer)
return ExtendedBackgroundModeNone;
auto& renderer = documentElementRenderer->rendererForRootBackground();
if (!renderer.style().hasBackgroundImage())
return ExtendedBackgroundModeNone;
ExtendedBackgroundMode mode = ExtendedBackgroundModeNone;
if (renderer.style().backgroundRepeatX() == RepeatFill)
mode |= ExtendedBackgroundModeHorizontal;
if (renderer.style().backgroundRepeatY() == RepeatFill)
mode |= ExtendedBackgroundModeVertical;
return mode;
}
void FrameView::updateTilesForExtendedBackgroundMode(ExtendedBackgroundMode mode)
{
if (!frame().settings().backgroundShouldExtendBeyondPage())
return;
RenderView* renderView = this->renderView();
if (!renderView)
return;
RenderLayerBacking* backing = renderView->layer()->backing();
if (!backing)
return;
TiledBacking* tiledBacking = backing->graphicsLayer()->tiledBacking();
if (!tiledBacking)
return;
ExtendedBackgroundMode existingMode = ExtendedBackgroundModeNone;
if (tiledBacking->hasVerticalMargins())
existingMode |= ExtendedBackgroundModeVertical;
if (tiledBacking->hasHorizontalMargins())
existingMode |= ExtendedBackgroundModeHorizontal;
if (existingMode == mode)
return;
renderView->compositor().setRootExtendedBackgroundColor(mode == ExtendedBackgroundModeAll ? Color() : documentBackgroundColor());
backing->setTiledBackingHasMargins(mode & ExtendedBackgroundModeHorizontal, mode & ExtendedBackgroundModeVertical);
}
IntRect FrameView::extendedBackgroundRectForPainting() const
{
TiledBacking* tiledBacking = this->tiledBacking();
if (!tiledBacking)
return IntRect();
RenderView* renderView = this->renderView();
if (!renderView)
return IntRect();
LayoutRect extendedRect = renderView->unextendedBackgroundRect(renderView);
if (!tiledBacking->hasMargins())
return snappedIntRect(extendedRect);
extendedRect.moveBy(LayoutPoint(-tiledBacking->leftMarginWidth(), -tiledBacking->topMarginHeight()));
extendedRect.expand(LayoutSize(tiledBacking->leftMarginWidth() + tiledBacking->rightMarginWidth(), tiledBacking->topMarginHeight() + tiledBacking->bottomMarginHeight()));
return snappedIntRect(extendedRect);
}
bool FrameView::shouldUpdateWhileOffscreen() const
{
return m_shouldUpdateWhileOffscreen;
}
void FrameView::setShouldUpdateWhileOffscreen(bool shouldUpdateWhileOffscreen)
{
m_shouldUpdateWhileOffscreen = shouldUpdateWhileOffscreen;
}
bool FrameView::shouldUpdate() const
{
if (isOffscreen() && !shouldUpdateWhileOffscreen())
return false;
return true;
}
void FrameView::scrollToAnchor()
{
RefPtr<ContainerNode> anchorNode = m_maintainScrollPositionAnchor;
if (!anchorNode)
return;
if (!anchorNode->renderer())
return;
LayoutRect rect;
if (anchorNode != frame().document())
rect = rendererAnchorRect(*anchorNode.get());
// Scroll nested layers and frames to reveal the anchor.
// Align to the top and to the closest side (this matches other browsers).
if (anchorNode->renderer()->style().isHorizontalWritingMode())
anchorNode->renderer()->scrollRectToVisible(rect, ScrollAlignment::alignToEdgeIfNeeded, ScrollAlignment::alignTopAlways);
else if (anchorNode->renderer()->style().isFlippedBlocksWritingMode())
anchorNode->renderer()->scrollRectToVisible(rect, ScrollAlignment::alignRightAlways, ScrollAlignment::alignToEdgeIfNeeded);
else
anchorNode->renderer()->scrollRectToVisible(rect, ScrollAlignment::alignLeftAlways, ScrollAlignment::alignToEdgeIfNeeded);
if (AXObjectCache* cache = frame().document()->existingAXObjectCache())
cache->handleScrolledToAnchor(anchorNode.get());
// scrollRectToVisible can call into setScrollPosition(), which resets m_maintainScrollPositionAnchor.
m_maintainScrollPositionAnchor = anchorNode;
}
void FrameView::updateEmbeddedObject(RenderEmbeddedObject& embeddedObject)
{
// No need to update if it's already crashed or known to be missing.
if (embeddedObject.isPluginUnavailable())
return;
HTMLFrameOwnerElement& element = embeddedObject.frameOwnerElement();
if (embeddedObject.isSnapshottedPlugIn()) {
if (is<HTMLObjectElement>(element) || is<HTMLEmbedElement>(element)) {
HTMLPlugInImageElement& pluginElement = downcast<HTMLPlugInImageElement>(element);
pluginElement.checkSnapshotStatus();
}
return;
}
auto weakRenderer = embeddedObject.createWeakPtr();
// FIXME: This could turn into a real virtual dispatch if we defined
// updateWidget(PluginCreationOption) on HTMLElement.
if (is<HTMLPlugInImageElement>(element)) {
HTMLPlugInImageElement& pluginElement = downcast<HTMLPlugInImageElement>(element);
if (pluginElement.needsCheckForSizeChange()) {
pluginElement.checkSnapshotStatus();
return;
}
if (pluginElement.needsWidgetUpdate())
pluginElement.updateWidget(CreateAnyWidgetType);
} else
ASSERT_NOT_REACHED();
// It's possible the renderer was destroyed below updateWidget() since loading a plugin may execute arbitrary JavaScript.
if (!weakRenderer)
return;
embeddedObject.updateWidgetPosition();
}
bool FrameView::updateEmbeddedObjects()
{
if (m_nestedLayoutCount > 1 || !m_embeddedObjectsToUpdate || m_embeddedObjectsToUpdate->isEmpty())
return true;
WidgetHierarchyUpdatesSuspensionScope suspendWidgetHierarchyUpdates;
// Insert a marker for where we should stop.
ASSERT(!m_embeddedObjectsToUpdate->contains(nullptr));
m_embeddedObjectsToUpdate->add(nullptr);
while (!m_embeddedObjectsToUpdate->isEmpty()) {
RenderEmbeddedObject* embeddedObject = m_embeddedObjectsToUpdate->takeFirst();
if (!embeddedObject)
break;
updateEmbeddedObject(*embeddedObject);
}
return m_embeddedObjectsToUpdate->isEmpty();
}
void FrameView::updateEmbeddedObjectsTimerFired()
{
RefPtr<FrameView> protect(this);
m_updateEmbeddedObjectsTimer.stop();
for (unsigned i = 0; i < maxUpdateEmbeddedObjectsIterations; i++) {
if (updateEmbeddedObjects())
break;
}
}
void FrameView::flushAnyPendingPostLayoutTasks()
{
if (m_postLayoutTasksTimer.isActive())
performPostLayoutTasks();
if (m_updateEmbeddedObjectsTimer.isActive())
updateEmbeddedObjectsTimerFired();
}
void FrameView::performPostLayoutTasks()
{
// FIXME: We should not run any JavaScript code in this function.
m_postLayoutTasksTimer.stop();
frame().selection().didLayout();
if (m_nestedLayoutCount <= 1 && frame().document()->documentElement())
fireLayoutRelatedMilestonesIfNeeded();
#if PLATFORM(IOS)
// Only send layout-related delegate callbacks synchronously for the main frame to
// avoid re-entering layout for the main frame while delivering a layout-related delegate
// callback for a subframe.
if (frame().isMainFrame())
frame().page()->chrome().client().didLayout();
#endif
#if ENABLE(FONT_LOAD_EVENTS)
if (RuntimeEnabledFeatures::sharedFeatures().fontLoadEventsEnabled())
frame().document()->fonts()->didLayout();
#endif
// FIXME: We should consider adding DidLayout as a LayoutMilestone. That would let us merge this
// with didLayout(LayoutMilestones).
frame().loader().client().dispatchDidLayout();
updateWidgetPositions();
// layout() protects FrameView, but it still can get destroyed when updateEmbeddedObjects()
// is called through the post layout timer.
Ref<FrameView> protect(*this);
m_updateEmbeddedObjectsTimer.startOneShot(0);
if (auto* page = frame().page()) {
if (auto* scrollingCoordinator = page->scrollingCoordinator())
scrollingCoordinator->frameViewLayoutUpdated(this);
}
if (RenderView* renderView = this->renderView()) {
if (renderView->usesCompositing())
renderView->compositor().frameViewDidLayout();
}
scrollToAnchor();
sendResizeEventIfNeeded();
// Check if we should unthrottle DOMTimers after layout as the position
// of Elements may have changed.
updateThrottledDOMTimersState();
}
IntSize FrameView::sizeForResizeEvent() const
{
#if PLATFORM(IOS)
if (m_useCustomSizeForResizeEvent)
return m_customSizeForResizeEvent;
#endif
if (useFixedLayout() && !fixedLayoutSize().isEmpty() && delegatesScrolling())
return fixedLayoutSize();
return visibleContentRectIncludingScrollbars().size();
}
void FrameView::sendResizeEventIfNeeded()
{
if (isInLayout() || needsLayout())
return;
RenderView* renderView = this->renderView();
if (!renderView || renderView->printing())
return;
if (frame().page() && frame().page()->chrome().client().isSVGImageChromeClient())
return;
IntSize currentSize = sizeForResizeEvent();
float currentZoomFactor = renderView->style().zoom();
if (currentSize == m_lastViewportSize && currentZoomFactor == m_lastZoomFactor)
return;
m_lastViewportSize = currentSize;
m_lastZoomFactor = currentZoomFactor;
if (m_firstLayout)
return;
#if PLATFORM(IOS)
// Don't send the resize event if the document is loading. Some pages automatically reload
// when the window is resized; Safari on iOS often resizes the window while setting up its
// viewport. This obviously can cause problems.
if (DocumentLoader* documentLoader = frame().loader().documentLoader()) {
if (documentLoader->isLoadingInAPISense())
return;
}
#endif
bool isMainFrame = frame().isMainFrame();
bool canSendResizeEventSynchronously = isMainFrame && !m_shouldAutoSize;
RefPtr<Event> resizeEvent = Event::create(eventNames().resizeEvent, false, false);
if (canSendResizeEventSynchronously)
frame().document()->dispatchWindowEvent(resizeEvent.release());
else {
// FIXME: Queueing this event for an unpredictable time in the future seems
// intrinsically racy. By the time this resize event fires, the frame might
// be resized again, so we could end up with two resize events for the same size.
frame().document()->enqueueWindowEvent(resizeEvent.release());
}
#if ENABLE(INSPECTOR)
if (InspectorInstrumentation::hasFrontends() && isMainFrame) {
if (Page* page = frame().page()) {
if (InspectorClient* inspectorClient = page->inspectorController().inspectorClient())
inspectorClient->didResizeMainFrame(&frame());
}
}
#endif
}
void FrameView::willStartLiveResize()
{
ScrollView::willStartLiveResize();
adjustTiledBackingCoverage();
}
void FrameView::willEndLiveResize()
{
ScrollView::willEndLiveResize();
adjustTiledBackingCoverage();
}
void FrameView::postLayoutTimerFired()
{
performPostLayoutTasks();
}
void FrameView::registerThrottledDOMTimer(DOMTimer* timer)
{
m_throttledTimers.add(timer);
}
void FrameView::unregisterThrottledDOMTimer(DOMTimer* timer)
{
m_throttledTimers.remove(timer);
}
void FrameView::updateThrottledDOMTimersState()
{
if (m_throttledTimers.isEmpty())
return;
IntRect visibleRect = windowToContents(windowClipRect());
// Do not iterate over the HashSet because calling DOMTimer::updateThrottlingStateAfterViewportChange()
// may cause timers to remove themselves from it while we are iterating.
Vector<DOMTimer*> timers;
copyToVector(m_throttledTimers, timers);
for (auto* timer : timers)
timer->updateThrottlingStateAfterViewportChange(visibleRect);
}
void FrameView::autoSizeIfEnabled()
{
if (!m_shouldAutoSize)
return;
if (m_inAutoSize)
return;
TemporaryChange<bool> changeInAutoSize(m_inAutoSize, true);
Document* document = frame().document();
if (!document)
return;
RenderView* documentView = document->renderView();
Element* documentElement = document->documentElement();
if (!documentView || !documentElement)
return;
// Start from the minimum size and allow it to grow.
resize(m_minAutoSize.width(), m_minAutoSize.height());
IntSize size = frameRect().size();
// Do the resizing twice. The first time is basically a rough calculation using the preferred width
// which may result in a height change during the second iteration.
for (int i = 0; i < 2; i++) {
// Update various sizes including contentsSize, scrollHeight, etc.
document->updateLayoutIgnorePendingStylesheets();
int width = documentView->minPreferredLogicalWidth();
int height = documentView->documentRect().height();
IntSize newSize(width, height);
// Check to see if a scrollbar is needed for a given dimension and
// if so, increase the other dimension to account for the scrollbar.
// Since the dimensions are only for the view rectangle, once a
// dimension exceeds the maximum, there is no need to increase it further.
if (newSize.width() > m_maxAutoSize.width()) {
RefPtr<Scrollbar> localHorizontalScrollbar = horizontalScrollbar();
if (!localHorizontalScrollbar)
localHorizontalScrollbar = createScrollbar(HorizontalScrollbar);
if (!localHorizontalScrollbar->isOverlayScrollbar())
newSize.setHeight(newSize.height() + localHorizontalScrollbar->height());
// Don't bother checking for a vertical scrollbar because the width is at
// already greater the maximum.
} else if (newSize.height() > m_maxAutoSize.height()) {
RefPtr<Scrollbar> localVerticalScrollbar = verticalScrollbar();
if (!localVerticalScrollbar)
localVerticalScrollbar = createScrollbar(VerticalScrollbar);
if (!localVerticalScrollbar->isOverlayScrollbar())
newSize.setWidth(newSize.width() + localVerticalScrollbar->width());
// Don't bother checking for a horizontal scrollbar because the height is
// already greater the maximum.
}
// Ensure the size is at least the min bounds.
newSize = newSize.expandedTo(m_minAutoSize);
// Bound the dimensions by the max bounds and determine what scrollbars to show.
ScrollbarMode horizonalScrollbarMode = ScrollbarAlwaysOff;
if (newSize.width() > m_maxAutoSize.width()) {
newSize.setWidth(m_maxAutoSize.width());
horizonalScrollbarMode = ScrollbarAlwaysOn;
}
ScrollbarMode verticalScrollbarMode = ScrollbarAlwaysOff;
if (newSize.height() > m_maxAutoSize.height()) {
newSize.setHeight(m_maxAutoSize.height());
verticalScrollbarMode = ScrollbarAlwaysOn;
}
if (newSize == size)
continue;
// While loading only allow the size to increase (to avoid twitching during intermediate smaller states)
// unless autoresize has just been turned on or the maximum size is smaller than the current size.
if (m_didRunAutosize && size.height() <= m_maxAutoSize.height() && size.width() <= m_maxAutoSize.width()
&& !frame().loader().isComplete() && (newSize.height() < size.height() || newSize.width() < size.width()))
break;
resize(newSize.width(), newSize.height());
// Force the scrollbar state to avoid the scrollbar code adding them and causing them to be needed. For example,
// a vertical scrollbar may cause text to wrap and thus increase the height (which is the only reason the scollbar is needed).
setVerticalScrollbarLock(false);
setHorizontalScrollbarLock(false);
setScrollbarModes(horizonalScrollbarMode, verticalScrollbarMode, true, true);
}
m_autoSizeContentSize = contentsSize();
if (m_autoSizeFixedMinimumHeight) {
resize(m_autoSizeContentSize.width(), std::max(m_autoSizeFixedMinimumHeight, m_autoSizeContentSize.height()));
document->updateLayoutIgnorePendingStylesheets();
}
m_didRunAutosize = true;
}
void FrameView::setAutoSizeFixedMinimumHeight(int fixedMinimumHeight)
{
if (m_autoSizeFixedMinimumHeight == fixedMinimumHeight)
return;
m_autoSizeFixedMinimumHeight = fixedMinimumHeight;
setNeedsLayout();
}
void FrameView::updateOverflowStatus(bool horizontalOverflow, bool verticalOverflow)
{
if (!m_viewportRenderer)
return;
if (m_overflowStatusDirty) {
m_horizontalOverflow = horizontalOverflow;
m_verticalOverflow = verticalOverflow;
m_overflowStatusDirty = false;
return;
}
bool horizontalOverflowChanged = (m_horizontalOverflow != horizontalOverflow);
bool verticalOverflowChanged = (m_verticalOverflow != verticalOverflow);
if (horizontalOverflowChanged || verticalOverflowChanged) {
m_horizontalOverflow = horizontalOverflow;
m_verticalOverflow = verticalOverflow;
RefPtr<OverflowEvent> overflowEvent = OverflowEvent::create(horizontalOverflowChanged, horizontalOverflow,
verticalOverflowChanged, verticalOverflow);
overflowEvent->setTarget(m_viewportRenderer->element());
frame().document()->enqueueOverflowEvent(overflowEvent.release());
}
}
const Pagination& FrameView::pagination() const
{
if (m_pagination != Pagination())
return m_pagination;
if (frame().isMainFrame())
return frame().page()->pagination();
return m_pagination;
}
void FrameView::setPagination(const Pagination& pagination)
{
if (m_pagination == pagination)
return;
m_pagination = pagination;
frame().document()->styleResolverChanged(DeferRecalcStyle);
}
IntRect FrameView::windowClipRect(bool clipToContents) const
{
ASSERT(frame().view() == this);
if (paintsEntireContents())
return contentsToWindow(IntRect(IntPoint(), totalContentsSize()));
// Set our clip rect to be our contents.
IntRect clipRect;
if (clipToContents)
clipRect = contentsToWindow(visibleContentRect(LegacyIOSDocumentVisibleRect));
else
clipRect = contentsToWindow(visibleContentRectIncludingScrollbars(LegacyIOSDocumentVisibleRect));
if (!frame().ownerElement())
return clipRect;
// Take our owner element and get its clip rect.
HTMLFrameOwnerElement* ownerElement = frame().ownerElement();
if (FrameView* parentView = ownerElement->document().view())
clipRect.intersect(parentView->windowClipRectForFrameOwner(ownerElement, true));
return clipRect;
}
IntRect FrameView::windowClipRectForFrameOwner(const HTMLFrameOwnerElement* ownerElement, bool clipToLayerContents) const
{
// The renderer can sometimes be null when style="display:none" interacts
// with external content and plugins.
if (!ownerElement->renderer())
return windowClipRect();
// If we have no layer, just return our window clip rect.
const RenderLayer* enclosingLayer = ownerElement->renderer()->enclosingLayer();
if (!enclosingLayer)
return windowClipRect();
// Apply the clip from the layer.
IntRect clipRect;
if (clipToLayerContents)
clipRect = snappedIntRect(enclosingLayer->childrenClipRect());
else
clipRect = snappedIntRect(enclosingLayer->selfClipRect());
clipRect = contentsToWindow(clipRect);
return intersection(clipRect, windowClipRect());
}
bool FrameView::isActive() const
{
Page* page = frame().page();
return page && page->focusController().isActive();
}
bool FrameView::updatesScrollLayerPositionOnMainThread() const
{
if (Page* page = frame().page()) {
if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
return scrollingCoordinator->shouldUpdateScrollLayerPositionSynchronously();
}
return true;
}
bool FrameView::forceUpdateScrollbarsOnMainThreadForPerformanceTesting() const
{
Page* page = frame().page();
return page && page->settings().forceUpdateScrollbarsOnMainThreadForPerformanceTesting();
}
void FrameView::scrollTo(const IntSize& newOffset)
{
LayoutSize offset = scrollOffset();
IntPoint oldPosition = scrollPosition();
ScrollView::scrollTo(newOffset);
if (offset != scrollOffset())
scrollPositionChanged(oldPosition, scrollPosition());
didChangeScrollOffset();
}
float FrameView::adjustScrollStepForFixedContent(float step, ScrollbarOrientation orientation, ScrollGranularity granularity)
{
if (granularity != ScrollByPage || orientation == HorizontalScrollbar)
return step;
TrackedRendererListHashSet* positionedObjects = nullptr;
if (RenderView* root = m_frame->contentRenderer()) {
if (!root->hasPositionedObjects())
return step;
positionedObjects = root->positionedObjects();
}
FloatRect unobscuredContentRect = this->unobscuredContentRect();
float topObscuredArea = 0;
float bottomObscuredArea = 0;
for (const auto& positionedObject : *positionedObjects) {
const RenderStyle& style = positionedObject->style();
if (style.position() != FixedPosition || style.visibility() == HIDDEN || !style.opacity())
continue;
FloatQuad contentQuad = positionedObject->absoluteContentQuad();
if (!contentQuad.isRectilinear())
continue;
FloatRect contentBoundingBox = contentQuad.boundingBox();
FloatRect fixedRectInView = intersection(unobscuredContentRect, contentBoundingBox);
if (fixedRectInView.width() < unobscuredContentRect.width())
continue;
if (fixedRectInView.y() == unobscuredContentRect.y())
topObscuredArea = std::max(topObscuredArea, fixedRectInView.height());
else if (fixedRectInView.maxY() == unobscuredContentRect.maxY())
bottomObscuredArea = std::max(bottomObscuredArea, fixedRectInView.height());
}
return Scrollbar::pageStep(unobscuredContentRect.height(), unobscuredContentRect.height() - topObscuredArea - bottomObscuredArea);
}
void FrameView::invalidateScrollbarRect(Scrollbar* scrollbar, const IntRect& rect)
{
// Add in our offset within the FrameView.
IntRect dirtyRect = rect;
dirtyRect.moveBy(scrollbar->location());
invalidateRect(dirtyRect);
}
IntRect FrameView::windowResizerRect() const
{
if (Page* page = frame().page())
return page->chrome().windowResizerRect();
return IntRect();
}
float FrameView::visibleContentScaleFactor() const
{
if (!frame().isMainFrame() || !frame().settings().delegatesPageScaling())
return 1;
return frame().page()->pageScaleFactor();
}
void FrameView::setVisibleScrollerThumbRect(const IntRect& scrollerThumb)
{
if (!frame().isMainFrame())
return;
frame().page()->chrome().client().notifyScrollerThumbIsVisibleInRect(scrollerThumb);
}
ScrollableArea* FrameView::enclosingScrollableArea() const
{
// FIXME: Walk up the frame tree and look for a scrollable parent frame or RenderLayer.
return 0;
}
IntRect FrameView::scrollableAreaBoundingBox() const
{
RenderWidget* ownerRenderer = frame().ownerRenderer();
if (!ownerRenderer)
return frameRect();
return ownerRenderer->absoluteContentQuad().enclosingBoundingBox();
}
bool FrameView::isScrollable(Scrollability definitionOfScrollable)
{
// Check for:
// 1) If there an actual overflow.
// 2) display:none or visibility:hidden set to self or inherited.
// 3) overflow{-x,-y}: hidden;
// 4) scrolling: no;
bool requiresActualOverflowToBeConsideredScrollable = !frame().isMainFrame() || definitionOfScrollable != Scrollability::ScrollableOrRubberbandable;
#if !ENABLE(RUBBER_BANDING)
requiresActualOverflowToBeConsideredScrollable = true;
#endif
// Covers #1
if (requiresActualOverflowToBeConsideredScrollable) {
IntSize totalContentsSize = this->totalContentsSize();
IntSize visibleContentSize = visibleContentRect(LegacyIOSDocumentVisibleRect).size();
if (totalContentsSize.height() <= visibleContentSize.height() && totalContentsSize.width() <= visibleContentSize.width())
return false;
}
// Covers #2.
HTMLFrameOwnerElement* owner = frame().ownerElement();
if (owner && (!owner->renderer() || !owner->renderer()->visibleToHitTesting()))
return false;
// Cover #3 and #4.
ScrollbarMode horizontalMode;
ScrollbarMode verticalMode;
calculateScrollbarModesForLayout(horizontalMode, verticalMode, RulesFromWebContentOnly);
if (horizontalMode == ScrollbarAlwaysOff && verticalMode == ScrollbarAlwaysOff)
return false;
return true;
}
bool FrameView::isScrollableOrRubberbandable()
{
return isScrollable(Scrollability::ScrollableOrRubberbandable);
}
bool FrameView::hasScrollableOrRubberbandableAncestor()
{
if (frame().isMainFrame())
return isScrollableOrRubberbandable();
for (FrameView* parent = this->parentFrameView(); parent; parent = parent->parentFrameView()) {
Scrollability frameScrollability = parent->frame().isMainFrame() ? Scrollability::ScrollableOrRubberbandable : Scrollability::Scrollable;
if (parent->isScrollable(frameScrollability))
return true;
}
return false;
}
void FrameView::updateScrollableAreaSet()
{
// That ensures that only inner frames are cached.
FrameView* parentFrameView = this->parentFrameView();
if (!parentFrameView)
return;
if (!isScrollable()) {
parentFrameView->removeScrollableArea(this);
return;
}
parentFrameView->addScrollableArea(this);
}
bool FrameView::shouldSuspendScrollAnimations() const
{
return frame().loader().state() != FrameStateComplete;
}
void FrameView::scrollbarStyleChanged(int newStyle, bool forceUpdate)
{
if (!frame().isMainFrame())
return;
frame().page()->chrome().client().recommendedScrollbarStyleDidChange(newStyle);
if (forceUpdate)
ScrollView::scrollbarStyleChanged(newStyle, forceUpdate);
}
void FrameView::notifyPageThatContentAreaWillPaint() const
{
Page* page = frame().page();
if (!page)
return;
contentAreaWillPaint();
if (!m_scrollableAreas)
return;
for (auto& scrollableArea : *m_scrollableAreas)
scrollableArea->contentAreaWillPaint();
}
bool FrameView::scrollAnimatorEnabled() const
{
#if ENABLE(SMOOTH_SCROLLING)
if (Page* page = frame().page())
return page->settings().scrollAnimatorEnabled();
#endif
return false;
}
#if ENABLE(DASHBOARD_SUPPORT)
void FrameView::updateAnnotatedRegions()
{
Document* document = frame().document();
if (!document->hasAnnotatedRegions())
return;
Vector<AnnotatedRegionValue> newRegions;
document->renderBox()->collectAnnotatedRegions(newRegions);
if (newRegions == document->annotatedRegions())
return;
document->setAnnotatedRegions(newRegions);
Page* page = frame().page();
if (!page)
return;
page->chrome().client().annotatedRegionsChanged();
}
#endif
void FrameView::updateScrollCorner()
{
RenderElement* renderer = 0;
RefPtr<RenderStyle> cornerStyle;
IntRect cornerRect = scrollCornerRect();
if (!cornerRect.isEmpty()) {
// Try the <body> element first as a scroll corner source.
Document* doc = frame().document();
Element* body = doc ? doc->body() : 0;
if (body && body->renderer()) {
renderer = body->renderer();
cornerStyle = renderer->getUncachedPseudoStyle(PseudoStyleRequest(SCROLLBAR_CORNER), &renderer->style());
}
if (!cornerStyle) {
// If the <body> didn't have a custom style, then the root element might.
Element* docElement = doc ? doc->documentElement() : 0;
if (docElement && docElement->renderer()) {
renderer = docElement->renderer();
cornerStyle = renderer->getUncachedPseudoStyle(PseudoStyleRequest(SCROLLBAR_CORNER), &renderer->style());
}
}
if (!cornerStyle) {
// If we have an owning iframe/frame element, then it can set the custom scrollbar also.
if (RenderWidget* renderer = frame().ownerRenderer())
cornerStyle = renderer->getUncachedPseudoStyle(PseudoStyleRequest(SCROLLBAR_CORNER), &renderer->style());
}
}
if (!cornerStyle)
m_scrollCorner = nullptr;
else {
if (!m_scrollCorner) {
m_scrollCorner = createRenderer<RenderScrollbarPart>(renderer->document(), cornerStyle.releaseNonNull());
m_scrollCorner->initializeStyle();
} else
m_scrollCorner->setStyle(cornerStyle.releaseNonNull());
invalidateScrollCorner(cornerRect);
}
ScrollView::updateScrollCorner();
}
void FrameView::paintScrollCorner(GraphicsContext* context, const IntRect& cornerRect)
{
if (context->updatingControlTints()) {
updateScrollCorner();
return;
}
if (m_scrollCorner) {
if (frame().isMainFrame())
context->fillRect(cornerRect, baseBackgroundColor(), ColorSpaceDeviceRGB);
m_scrollCorner->paintIntoRect(context, cornerRect.location(), cornerRect);
return;
}
ScrollView::paintScrollCorner(context, cornerRect);
}
void FrameView::paintScrollbar(GraphicsContext* context, Scrollbar* bar, const IntRect& rect)
{
if (bar->isCustomScrollbar() && frame().isMainFrame()) {
IntRect toFill = bar->frameRect();
toFill.intersect(rect);
context->fillRect(toFill, baseBackgroundColor(), ColorSpaceDeviceRGB);
}
ScrollView::paintScrollbar(context, bar, rect);
}
Color FrameView::documentBackgroundColor() const
{
// <https://bugs.webkit.org/show_bug.cgi?id=59540> We blend the background color of
// the document and the body against the base background color of the frame view.
// Background images are unfortunately impractical to include.
// Return invalid Color objects whenever there is insufficient information.
if (!frame().document())
return Color();
Element* htmlElement = frame().document()->documentElement();
Element* bodyElement = frame().document()->body();
// Start with invalid colors.
Color htmlBackgroundColor;
Color bodyBackgroundColor;
if (htmlElement && htmlElement->renderer())
htmlBackgroundColor = htmlElement->renderer()->style().visitedDependentColor(CSSPropertyBackgroundColor);
if (bodyElement && bodyElement->renderer())
bodyBackgroundColor = bodyElement->renderer()->style().visitedDependentColor(CSSPropertyBackgroundColor);
if (!bodyBackgroundColor.isValid()) {
if (!htmlBackgroundColor.isValid())
return Color();
return baseBackgroundColor().blend(htmlBackgroundColor);
}
if (!htmlBackgroundColor.isValid())
return baseBackgroundColor().blend(bodyBackgroundColor);
// We take the aggregate of the base background color
// the <html> background color, and the <body>
// background color to find the document color. The
// addition of the base background color is not
// technically part of the document background, but it
// otherwise poses problems when the aggregate is not
// fully opaque.
return baseBackgroundColor().blend(htmlBackgroundColor).blend(bodyBackgroundColor);
}
bool FrameView::hasCustomScrollbars() const
{
for (auto& widget : children()) {
if (is<FrameView>(*widget)) {
if (downcast<FrameView>(*widget).hasCustomScrollbars())
return true;
} else if (is<Scrollbar>(*widget)) {
if (downcast<Scrollbar>(*widget).isCustomScrollbar())
return true;
}
}
return false;
}
FrameView* FrameView::parentFrameView() const
{
if (!parent())
return 0;
if (Frame* parentFrame = frame().tree().parent())
return parentFrame->view();
return 0;
}
bool FrameView::isInChildFrameWithFrameFlattening() const
{
if (!parent() || !frame().ownerElement())
return false;
// Frame flattening applies when the owner element is either in a frameset or
// an iframe with flattening parameters.
if (is<HTMLIFrameElement>(*frame().ownerElement())) {
RenderIFrame& iframeRenderer = downcast<RenderIFrame>(*frame().ownerElement()->renderWidget());
if (iframeRenderer.flattenFrame())
return true;
}
if (!frameFlatteningEnabled())
return false;
if (is<HTMLFrameElement>(*frame().ownerElement()))
return true;
return false;
}
void FrameView::startLayoutAtMainFrameViewIfNeeded(bool allowSubtree)
{
// When we start a layout at the child level as opposed to the topmost frame view and this child
// frame requires flattening, we need to re-initiate the layout at the topmost view. Layout
// will hit this view eventually.
FrameView* parentView = parentFrameView();
if (!parentView)
return;
// In the middle of parent layout, no need to restart from topmost.
if (parentView->m_nestedLayoutCount)
return;
// Parent tree is clean. Starting layout from it would have no effect.
if (!parentView->needsLayout())
return;
while (parentView->parentFrameView())
parentView = parentView->parentFrameView();
parentView->layout(allowSubtree);
RenderElement* root = m_layoutRoot ? m_layoutRoot : frame().document()->renderView();
ASSERT_UNUSED(root, !root->needsLayout());
}
void FrameView::updateControlTints()
{
// This is called when control tints are changed from aqua/graphite to clear and vice versa.
// We do a "fake" paint, and when the theme gets a paint call, it can then do an invalidate.
// This is only done if the theme supports control tinting. It's up to the theme and platform
// to define when controls get the tint and to call this function when that changes.
// Optimize the common case where we bring a window to the front while it's still empty.
if (frame().document()->url().isEmpty())
return;
RenderView* renderView = this->renderView();
if ((renderView && renderView->theme().supportsControlTints()) || hasCustomScrollbars())
paintControlTints();
}
void FrameView::paintControlTints()
{
if (needsLayout())
layout();
PlatformGraphicsContext* const noContext = 0;
GraphicsContext context(noContext);
context.setUpdatingControlTints(true);
if (platformWidget()) {
// FIXME: consult paintsEntireContents().
paintContents(&context, visibleContentRect(LegacyIOSDocumentVisibleRect));
} else
paint(&context, frameRect());
}
bool FrameView::wasScrolledByUser() const
{
return m_wasScrolledByUser;
}
void FrameView::setWasScrolledByUser(bool wasScrolledByUser)
{
if (m_inProgrammaticScroll)
return;
m_maintainScrollPositionAnchor = nullptr;
if (m_wasScrolledByUser == wasScrolledByUser)
return;
m_wasScrolledByUser = wasScrolledByUser;
if (frame().isMainFrame())
updateLayerFlushThrottling();
adjustTiledBackingCoverage();
}
void FrameView::willPaintContents(GraphicsContext* context, const IntRect& dirtyRect, PaintingState& paintingState)
{
Document* document = frame().document();
if (!context->paintingDisabled())
InspectorInstrumentation::willPaint(renderView());
paintingState.isTopLevelPainter = !sCurrentPaintTimeStamp;
if (paintingState.isTopLevelPainter && memoryPressureHandler().isUnderMemoryPressure()) {
LOG(MemoryPressure, "Under memory pressure: %s", WTF_PRETTY_FUNCTION);
// To avoid unnecessary image decoding, we don't prune recently-decoded live resources here since
// we might need some live bitmaps on painting.
memoryCache().prune();
}
if (paintingState.isTopLevelPainter)
sCurrentPaintTimeStamp = monotonicallyIncreasingTime();
paintingState.paintBehavior = m_paintBehavior;
if (FrameView* parentView = parentFrameView()) {
if (parentView->paintBehavior() & PaintBehaviorFlattenCompositingLayers)
m_paintBehavior |= PaintBehaviorFlattenCompositingLayers;
}
if (m_paintBehavior == PaintBehaviorNormal)
document->markers().invalidateRenderedRectsForMarkersInRect(dirtyRect);
if (document->printing())
m_paintBehavior |= PaintBehaviorFlattenCompositingLayers;
paintingState.isFlatteningPaintOfRootFrame = (m_paintBehavior & PaintBehaviorFlattenCompositingLayers) && !frame().ownerElement();
if (paintingState.isFlatteningPaintOfRootFrame)
notifyWidgetsInAllFrames(WillPaintFlattened);
ASSERT(!m_isPainting);
m_isPainting = true;
}
void FrameView::didPaintContents(GraphicsContext* context, const IntRect& dirtyRect, PaintingState& paintingState)
{
m_isPainting = false;
if (paintingState.isFlatteningPaintOfRootFrame)
notifyWidgetsInAllFrames(DidPaintFlattened);
m_paintBehavior = paintingState.paintBehavior;
m_lastPaintTime = monotonicallyIncreasingTime();
// Painting can lead to decoding of large amounts of bitmaps
// If we are low on memory, wipe them out after the paint.
if (paintingState.isTopLevelPainter && memoryPressureHandler().isUnderMemoryPressure())
memoryCache().pruneLiveResources(true);
// Regions may have changed as a result of the visibility/z-index of element changing.
#if ENABLE(DASHBOARD_SUPPORT)
if (frame().document()->annotatedRegionsDirty())
updateAnnotatedRegions();
#endif
if (paintingState.isTopLevelPainter)
sCurrentPaintTimeStamp = 0;
if (!context->paintingDisabled()) {
InspectorInstrumentation::didPaint(renderView(), dirtyRect);
// FIXME: should probably not fire milestones for snapshot painting. https://bugs.webkit.org/show_bug.cgi?id=117623
firePaintRelatedMilestonesIfNeeded();
}
}
void FrameView::paintContents(GraphicsContext* context, const IntRect& dirtyRect)
{
#ifndef NDEBUG
bool fillWithRed;
if (frame().document()->printing())
fillWithRed = false; // Printing, don't fill with red (can't remember why).
else if (frame().ownerElement())
fillWithRed = false; // Subframe, don't fill with red.
else if (isTransparent())
fillWithRed = false; // Transparent, don't fill with red.
else if (m_paintBehavior & PaintBehaviorSelectionOnly)
fillWithRed = false; // Selections are transparent, don't fill with red.
else if (m_nodeToDraw)
fillWithRed = false; // Element images are transparent, don't fill with red.
else
fillWithRed = true;
if (fillWithRed)
context->fillRect(dirtyRect, Color(0xFF, 0, 0), ColorSpaceDeviceRGB);
#endif
RenderView* renderView = this->renderView();
if (!renderView) {
LOG_ERROR("called FrameView::paint with nil renderer");
return;
}
ASSERT(!needsLayout());
if (needsLayout())
return;
PaintingState paintingState;
willPaintContents(context, dirtyRect, paintingState);
FontCachePurgePreventer fontCachePurgePreventer;
// m_nodeToDraw is used to draw only one element (and its descendants)
RenderObject* renderer = m_nodeToDraw ? m_nodeToDraw->renderer() : nullptr;
RenderLayer* rootLayer = renderView->layer();
#ifndef NDEBUG
RenderElement::SetLayoutNeededForbiddenScope forbidSetNeedsLayout(&rootLayer->renderer());
#endif
// To work around http://webkit.org/b/135106, ensure that the paint root isn't an inline with culled line boxes.
// FIXME: This can cause additional content to be included in the snapshot, so remove this once that bug is fixed.
while (is<RenderInline>(renderer) && !downcast<RenderInline>(*renderer).firstLineBox())
renderer = renderer->parent();
rootLayer->paint(context, dirtyRect, LayoutSize(), m_paintBehavior, renderer);
if (rootLayer->containsDirtyOverlayScrollbars())
rootLayer->paintOverlayScrollbars(context, dirtyRect, m_paintBehavior, renderer);
didPaintContents(context, dirtyRect, paintingState);
}
void FrameView::setPaintBehavior(PaintBehavior behavior)
{
m_paintBehavior = behavior;
}
PaintBehavior FrameView::paintBehavior() const
{
return m_paintBehavior;
}
bool FrameView::isPainting() const
{
return m_isPainting;
}
// FIXME: change this to use the subtreePaint terminology.
void FrameView::setNodeToDraw(Node* node)
{
m_nodeToDraw = node;
}
void FrameView::paintContentsForSnapshot(GraphicsContext* context, const IntRect& imageRect, SelectionInSnapshot shouldPaintSelection, CoordinateSpaceForSnapshot coordinateSpace)
{
updateLayoutAndStyleIfNeededRecursive();
// Cache paint behavior and set a new behavior appropriate for snapshots.
PaintBehavior oldBehavior = paintBehavior();
setPaintBehavior(oldBehavior | PaintBehaviorFlattenCompositingLayers);
// If the snapshot should exclude selection, then we'll clear the current selection
// in the render tree only. This will allow us to restore the selection from the DOM
// after we paint the snapshot.
if (shouldPaintSelection == ExcludeSelection) {
for (Frame* frame = m_frame.get(); frame; frame = frame->tree().traverseNext(m_frame.get())) {
if (RenderView* root = frame->contentRenderer())
root->clearSelection();
}
}
if (coordinateSpace == DocumentCoordinates)
paintContents(context, imageRect);
else {
// A snapshot in ViewCoordinates will include a scrollbar, and the snapshot will contain
// whatever content the document is currently scrolled to.
paint(context, imageRect);
}
// Restore selection.
if (shouldPaintSelection == ExcludeSelection) {
for (Frame* frame = m_frame.get(); frame; frame = frame->tree().traverseNext(m_frame.get()))
frame->selection().updateAppearance();
}
// Restore cached paint behavior.
setPaintBehavior(oldBehavior);
}
void FrameView::paintOverhangAreas(GraphicsContext* context, const IntRect& horizontalOverhangArea, const IntRect& verticalOverhangArea, const IntRect& dirtyRect)
{
if (context->paintingDisabled())
return;
if (frame().document()->printing())
return;
ScrollView::paintOverhangAreas(context, horizontalOverhangArea, verticalOverhangArea, dirtyRect);
}
void FrameView::updateLayoutAndStyleIfNeededRecursive()
{
// We have to crawl our entire tree looking for any FrameViews that need
// layout and make sure they are up to date.
// Mac actually tests for intersection with the dirty region and tries not to
// update layout for frames that are outside the dirty region. Not only does this seem
// pointless (since those frames will have set a zero timer to layout anyway), but
// it is also incorrect, since if two frames overlap, the first could be excluded from the dirty
// region but then become included later by the second frame adding rects to the dirty region
// when it lays out.
AnimationUpdateBlock animationUpdateBlock(&frame().animation());
frame().document()->updateStyleIfNeeded();
if (needsLayout())
layout();
// Grab a copy of the children() set, as it may be mutated by the following updateLayoutAndStyleIfNeededRecursive
// calls, as they can potentially re-enter a layout of the parent frame view, which may add/remove scrollbars
// and thus mutates the children() set.
Vector<Ref<FrameView>, 16> childViews;
childViews.reserveInitialCapacity(children().size());
for (auto& widget : children()) {
if (is<FrameView>(*widget))
childViews.uncheckedAppend(downcast<FrameView>(*widget));
}
for (unsigned i = 0; i < childViews.size(); ++i)
childViews[i]->updateLayoutAndStyleIfNeededRecursive();
// When frame flattening is on, child frame can mark parent frame dirty. In such case, child frame
// needs to call layout on parent frame recursively.
// This assert ensures that parent frames are clean, when child frames finished updating layout and style.
ASSERT(!needsLayout());
}
bool FrameView::qualifiesAsVisuallyNonEmpty() const
{
// No content yet.
Element* documentElement = frame().document()->documentElement();
if (!documentElement || !documentElement->renderer())
return false;
// Ensure that we always get marked visually non-empty eventually.
if (!frame().document()->parsing() && frame().loader().stateMachine().committedFirstRealDocumentLoad())
return true;
// Require the document to grow a bit.
static const int documentHeightThreshold = 200;
if (documentElement->renderBox()->layoutOverflowRect().pixelSnappedSize().height() < documentHeightThreshold)
return false;
// The first few hundred characters rarely contain the interesting content of the page.
if (m_visuallyNonEmptyCharacterCount > visualCharacterThreshold)
return true;
// Use a threshold value to prevent very small amounts of visible content from triggering didFirstVisuallyNonEmptyLayout
if (m_visuallyNonEmptyPixelCount > visualPixelThreshold)
return true;
return false;
}
void FrameView::updateIsVisuallyNonEmpty()
{
if (m_isVisuallyNonEmpty)
return;
if (!qualifiesAsVisuallyNonEmpty())
return;
m_isVisuallyNonEmpty = true;
adjustTiledBackingCoverage();
}
void FrameView::enableAutoSizeMode(bool enable, const IntSize& minSize, const IntSize& maxSize)
{
ASSERT(!enable || !minSize.isEmpty());
ASSERT(minSize.width() <= maxSize.width());
ASSERT(minSize.height() <= maxSize.height());
if (m_shouldAutoSize == enable && m_minAutoSize == minSize && m_maxAutoSize == maxSize)
return;
m_shouldAutoSize = enable;
m_minAutoSize = minSize;
m_maxAutoSize = maxSize;
m_didRunAutosize = false;
setNeedsLayout();
scheduleRelayout();
if (m_shouldAutoSize)
return;
// Since autosize mode forces the scrollbar mode, change them to being auto.
setVerticalScrollbarLock(false);
setHorizontalScrollbarLock(false);
setScrollbarModes(ScrollbarAuto, ScrollbarAuto);
}
void FrameView::forceLayout(bool allowSubtree)
{
layout(allowSubtree);
}
void FrameView::forceLayoutForPagination(const FloatSize& pageSize, const FloatSize& originalPageSize, float maximumShrinkFactor, AdjustViewSizeOrNot shouldAdjustViewSize)
{
// Dumping externalRepresentation(frame().renderer()).ascii() is a good trick to see
// the state of things before and after the layout
if (RenderView* renderView = this->renderView()) {
float pageLogicalWidth = renderView->style().isHorizontalWritingMode() ? pageSize.width() : pageSize.height();
float pageLogicalHeight = renderView->style().isHorizontalWritingMode() ? pageSize.height() : pageSize.width();
renderView->setLogicalWidth(floor(pageLogicalWidth));
renderView->setPageLogicalHeight(floor(pageLogicalHeight));
renderView->setNeedsLayoutAndPrefWidthsRecalc();
forceLayout();
// If we don't fit in the given page width, we'll lay out again. If we don't fit in the
// page width when shrunk, we will lay out at maximum shrink and clip extra content.
// FIXME: We are assuming a shrink-to-fit printing implementation. A cropping
// implementation should not do this!
bool horizontalWritingMode = renderView->style().isHorizontalWritingMode();
const LayoutRect& documentRect = renderView->documentRect();
LayoutUnit docLogicalWidth = horizontalWritingMode ? documentRect.width() : documentRect.height();
if (docLogicalWidth > pageLogicalWidth) {
int expectedPageWidth = std::min<float>(documentRect.width(), pageSize.width() * maximumShrinkFactor);
int expectedPageHeight = std::min<float>(documentRect.height(), pageSize.height() * maximumShrinkFactor);
FloatSize maxPageSize = frame().resizePageRectsKeepingRatio(FloatSize(originalPageSize.width(), originalPageSize.height()), FloatSize(expectedPageWidth, expectedPageHeight));
pageLogicalWidth = horizontalWritingMode ? maxPageSize.width() : maxPageSize.height();
pageLogicalHeight = horizontalWritingMode ? maxPageSize.height() : maxPageSize.width();
renderView->setLogicalWidth(floor(pageLogicalWidth));
renderView->setPageLogicalHeight(floor(pageLogicalHeight));
renderView->setNeedsLayoutAndPrefWidthsRecalc();
forceLayout();
const LayoutRect& updatedDocumentRect = renderView->documentRect();
LayoutUnit docLogicalHeight = horizontalWritingMode ? updatedDocumentRect.height() : updatedDocumentRect.width();
LayoutUnit docLogicalTop = horizontalWritingMode ? updatedDocumentRect.y() : updatedDocumentRect.x();
LayoutUnit docLogicalRight = horizontalWritingMode ? updatedDocumentRect.maxX() : updatedDocumentRect.maxY();
LayoutUnit clippedLogicalLeft = 0;
if (!renderView->style().isLeftToRightDirection())
clippedLogicalLeft = docLogicalRight - pageLogicalWidth;
LayoutRect overflow(clippedLogicalLeft, docLogicalTop, pageLogicalWidth, docLogicalHeight);
if (!horizontalWritingMode)
overflow = overflow.transposedRect();
renderView->clearLayoutOverflow();
renderView->addLayoutOverflow(overflow); // This is how we clip in case we overflow again.
}
}
if (shouldAdjustViewSize)
adjustViewSize();
}
void FrameView::adjustPageHeightDeprecated(float *newBottom, float oldTop, float oldBottom, float /*bottomLimit*/)
{
RenderView* renderView = this->renderView();
if (!renderView) {
*newBottom = oldBottom;
return;
}
// Use a context with painting disabled.
GraphicsContext context((PlatformGraphicsContext*)0);
renderView->setTruncatedAt(static_cast<int>(floorf(oldBottom)));
IntRect dirtyRect(0, static_cast<int>(floorf(oldTop)), renderView->layoutOverflowRect().maxX(), static_cast<int>(ceilf(oldBottom - oldTop)));
renderView->setPrintRect(dirtyRect);
renderView->layer()->paint(&context, dirtyRect);
*newBottom = renderView->bestTruncatedAt();
if (!*newBottom)
*newBottom = oldBottom;
renderView->setPrintRect(IntRect());
}
IntRect FrameView::convertFromRendererToContainingView(const RenderElement* renderer, const IntRect& rendererRect) const
{
IntRect rect = snappedIntRect(enclosingLayoutRect(renderer->localToAbsoluteQuad(FloatRect(rendererRect)).boundingBox()));
// Convert from page ("absolute") to FrameView coordinates.
if (!delegatesScrolling())
rect.moveBy(-scrollPosition() + IntPoint(0, headerHeight() + topContentInset(TopContentInsetType::WebCoreOrPlatformContentInset)));
return rect;
}
IntRect FrameView::convertFromContainingViewToRenderer(const RenderElement* renderer, const IntRect& viewRect) const
{
IntRect rect = viewRect;
// Convert from FrameView coords into page ("absolute") coordinates.
if (!delegatesScrolling())
rect.moveBy(documentScrollPositionRelativeToViewOrigin());
// FIXME: we don't have a way to map an absolute rect down to a local quad, so just
// move the rect for now.
rect.setLocation(roundedIntPoint(renderer->absoluteToLocal(rect.location(), UseTransforms)));
return rect;
}
IntPoint FrameView::convertFromRendererToContainingView(const RenderElement* renderer, const IntPoint& rendererPoint) const
{
IntPoint point = roundedIntPoint(renderer->localToAbsolute(rendererPoint, UseTransforms));
// Convert from page ("absolute") to FrameView coordinates.
if (!delegatesScrolling())
point.moveBy(-scrollPosition() + IntPoint(0, headerHeight() + topContentInset(TopContentInsetType::WebCoreOrPlatformContentInset)));
return point;
}
IntPoint FrameView::convertFromContainingViewToRenderer(const RenderElement* renderer, const IntPoint& viewPoint) const
{
IntPoint point = viewPoint;
// Convert from FrameView coords into page ("absolute") coordinates.
if (!delegatesScrolling())
point = point + documentScrollPositionRelativeToViewOrigin();
return roundedIntPoint(renderer->absoluteToLocal(point, UseTransforms));
}
IntRect FrameView::convertToContainingView(const IntRect& localRect) const
{
if (const ScrollView* parentScrollView = parent()) {
if (is<FrameView>(*parentScrollView)) {
const FrameView& parentView = downcast<FrameView>(*parentScrollView);
// Get our renderer in the parent view
RenderWidget* renderer = frame().ownerRenderer();
if (!renderer)
return localRect;
IntRect rect(localRect);
// Add borders and padding??
rect.move(renderer->borderLeft() + renderer->paddingLeft(),
renderer->borderTop() + renderer->paddingTop());
return parentView.convertFromRendererToContainingView(renderer, rect);
}
return Widget::convertToContainingView(localRect);
}
return localRect;
}
IntRect FrameView::convertFromContainingView(const IntRect& parentRect) const
{
if (const ScrollView* parentScrollView = parent()) {
if (is<FrameView>(*parentScrollView)) {
const FrameView& parentView = downcast<FrameView>(*parentScrollView);
// Get our renderer in the parent view
RenderWidget* renderer = frame().ownerRenderer();
if (!renderer)
return parentRect;
IntRect rect = parentView.convertFromContainingViewToRenderer(renderer, parentRect);
// Subtract borders and padding
rect.move(-renderer->borderLeft() - renderer->paddingLeft(),
-renderer->borderTop() - renderer->paddingTop());
return rect;
}
return Widget::convertFromContainingView(parentRect);
}
return parentRect;
}
IntPoint FrameView::convertToContainingView(const IntPoint& localPoint) const
{
if (const ScrollView* parentScrollView = parent()) {
if (is<FrameView>(*parentScrollView)) {
const FrameView& parentView = downcast<FrameView>(*parentScrollView);
// Get our renderer in the parent view
RenderWidget* renderer = frame().ownerRenderer();
if (!renderer)
return localPoint;
IntPoint point(localPoint);
// Add borders and padding
point.move(renderer->borderLeft() + renderer->paddingLeft(),
renderer->borderTop() + renderer->paddingTop());
return parentView.convertFromRendererToContainingView(renderer, point);
}
return Widget::convertToContainingView(localPoint);
}
return localPoint;
}
IntPoint FrameView::convertFromContainingView(const IntPoint& parentPoint) const
{
if (const ScrollView* parentScrollView = parent()) {
if (is<FrameView>(*parentScrollView)) {
const FrameView& parentView = downcast<FrameView>(*parentScrollView);
// Get our renderer in the parent view
RenderWidget* renderer = frame().ownerRenderer();
if (!renderer)
return parentPoint;
IntPoint point = parentView.convertFromContainingViewToRenderer(renderer, parentPoint);
// Subtract borders and padding
point.move(-renderer->borderLeft() - renderer->paddingLeft(),
-renderer->borderTop() - renderer->paddingTop());
return point;
}
return Widget::convertFromContainingView(parentPoint);
}
return parentPoint;
}
void FrameView::setTracksRepaints(bool trackRepaints)
{
if (trackRepaints == m_isTrackingRepaints)
return;
// Force layout to flush out any pending repaints.
if (trackRepaints) {
if (frame().document())
frame().document()->updateLayout();
}
for (Frame* frame = &m_frame->tree().top(); frame; frame = frame->tree().traverseNext()) {
if (RenderView* renderView = frame->contentRenderer())
renderView->compositor().setTracksRepaints(trackRepaints);
}
resetTrackedRepaints();
m_isTrackingRepaints = trackRepaints;
}
void FrameView::resetTrackedRepaints()
{
m_trackedRepaintRects.clear();
if (RenderView* renderView = this->renderView())
renderView->compositor().resetTrackedRepaintRects();
}
String FrameView::trackedRepaintRectsAsText() const
{
if (frame().document())
frame().document()->updateLayout();
TextStream ts;
if (!m_trackedRepaintRects.isEmpty()) {
ts << "(repaint rects\n";
for (size_t i = 0; i < m_trackedRepaintRects.size(); ++i)
ts << " (rect " << LayoutUnit(m_trackedRepaintRects[i].x()) << " " << LayoutUnit(m_trackedRepaintRects[i].y()) << " " << LayoutUnit(m_trackedRepaintRects[i].width()) << " " << LayoutUnit(m_trackedRepaintRects[i].height()) << ")\n";
ts << ")\n";
}
return ts.release();
}
bool FrameView::addScrollableArea(ScrollableArea* scrollableArea)
{
if (!m_scrollableAreas)
m_scrollableAreas = std::make_unique<ScrollableAreaSet>();
if (m_scrollableAreas->add(scrollableArea).isNewEntry) {
scrollableAreaSetChanged();
return true;
}
return false;
}
bool FrameView::removeScrollableArea(ScrollableArea* scrollableArea)
{
if (m_scrollableAreas && m_scrollableAreas->remove(scrollableArea)) {
scrollableAreaSetChanged();
return true;
}
return false;
}
bool FrameView::containsScrollableArea(ScrollableArea* scrollableArea) const
{
return m_scrollableAreas && m_scrollableAreas->contains(scrollableArea);
}
void FrameView::scrollableAreaSetChanged()
{
if (auto* page = frame().page()) {
if (auto* scrollingCoordinator = page->scrollingCoordinator())
scrollingCoordinator->frameViewNonFastScrollableRegionChanged(this);
}
}
void FrameView::sendScrollEvent()
{
frame().eventHandler().sendScrollEvent();
frame().eventHandler().dispatchFakeMouseMoveEventSoon();
}
void FrameView::removeChild(Widget& widget)
{
if (is<FrameView>(widget))
removeScrollableArea(&downcast<FrameView>(widget));
ScrollView::removeChild(widget);
}
bool FrameView::wheelEvent(const PlatformWheelEvent& wheelEvent)
{
// Note that to allow for rubber-band over-scroll behavior, even non-scrollable views
// should handle wheel events.
#if !ENABLE(RUBBER_BANDING)
if (!isScrollable())
return false;
#endif
if (delegatesScrolling()) {
IntSize offset = scrollOffset();
IntPoint oldPosition = scrollPosition();
IntSize newOffset = IntSize(offset.width() - wheelEvent.deltaX(), offset.height() - wheelEvent.deltaY());
if (offset != newOffset) {
ScrollView::scrollTo(newOffset);
scrollPositionChanged(oldPosition, scrollPosition());
didChangeScrollOffset();
}
return true;
}
// We don't allow mouse wheeling to happen in a ScrollView that has had its scrollbars explicitly disabled.
if (!canHaveScrollbars())
return false;
if (platformWidget())
return false;
#if ENABLE(ASYNC_SCROLLING)
if (Page* page = frame().page()) {
if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator()) {
if (scrollingCoordinator->coordinatesScrollingForFrameView(this))
return scrollingCoordinator->handleWheelEvent(this, wheelEvent);
}
}
#endif
return ScrollableArea::handleWheelEvent(wheelEvent);
}
bool FrameView::isVerticalDocument() const
{
RenderView* renderView = this->renderView();
if (!renderView)
return true;
return renderView->style().isHorizontalWritingMode();
}
bool FrameView::isFlippedDocument() const
{
RenderView* renderView = this->renderView();
if (!renderView)
return false;
return renderView->style().isFlippedBlocksWritingMode();
}
bool FrameView::containsSVGDocument() const
{
if (frame().document())
return frame().document()->isSVGDocument();
return false;
}
void FrameView::notifyWidgetsInAllFrames(WidgetNotification notification)
{
for (Frame* frame = m_frame.get(); frame; frame = frame->tree().traverseNext(m_frame.get())) {
if (FrameView* view = frame->view())
view->notifyWidgets(notification);
}
}
AXObjectCache* FrameView::axObjectCache() const
{
if (frame().document())
return frame().document()->existingAXObjectCache();
return 0;
}
#if PLATFORM(IOS)
void FrameView::setCustomFixedPositionLayoutRect(const IntRect& rect)
{
if (m_useCustomFixedPositionLayoutRect && m_customFixedPositionLayoutRect == rect)
return;
m_useCustomFixedPositionLayoutRect = true;
m_customFixedPositionLayoutRect = rect;
visibleContentsResized();
}
bool FrameView::updateFixedPositionLayoutRect()
{
if (!m_useCustomFixedPositionLayoutRect)
return false;
IntRect newRect;
Page* page = frame().page();
if (!page || !page->chrome().client().fetchCustomFixedPositionLayoutRect(newRect))
return false;
if (newRect != m_customFixedPositionLayoutRect) {
m_customFixedPositionLayoutRect = newRect;
setViewportConstrainedObjectsNeedLayout();
return true;
}
return false;
}
void FrameView::setCustomSizeForResizeEvent(IntSize customSize)
{
m_useCustomSizeForResizeEvent = true;
m_customSizeForResizeEvent = customSize;
sendResizeEventIfNeeded();
}
void FrameView::setScrollVelocity(double horizontalVelocity, double verticalVelocity, double scaleChangeRate, double timestamp)
{
m_horizontalVelocity = horizontalVelocity;
m_verticalVelocity = verticalVelocity;
m_scaleChangeRate = scaleChangeRate;
m_lastVelocityUpdateTime = timestamp;
}
FloatRect FrameView::computeCoverageRect(double horizontalMargin, double verticalMargin) const
{
FloatRect exposedContentRect = this->exposedContentRect();
if (!m_speculativeTilingEnabled || memoryPressureHandler().isUnderMemoryPressure())
return exposedContentRect;
double currentTime = monotonicallyIncreasingTime();
double timeDelta = currentTime - m_lastVelocityUpdateTime;
FloatRect futureRect = exposedContentRect;
futureRect.setLocation(FloatPoint(futureRect.location().x() + timeDelta * m_horizontalVelocity, futureRect.location().y() + timeDelta * m_verticalVelocity));
if (m_horizontalVelocity) {
futureRect.setWidth(futureRect.width() + horizontalMargin);
if (m_horizontalVelocity < 0)
futureRect.setX(futureRect.x() - horizontalMargin);
}
if (m_verticalVelocity) {
futureRect.setHeight(futureRect.height() + verticalMargin);
if (m_verticalVelocity < 0)
futureRect.setY(futureRect.y() - verticalMargin);
}
if (m_scaleChangeRate <= 0 && !m_horizontalVelocity && !m_verticalVelocity) {
futureRect.setWidth(futureRect.width() + horizontalMargin);
futureRect.setHeight(futureRect.height() + verticalMargin);
futureRect.setX(futureRect.x() - horizontalMargin / 2);
futureRect.setY(futureRect.y() - verticalMargin / 2);
}
IntSize contentSize = contentsSize();
if (futureRect.maxX() > contentSize.width())
futureRect.setX(contentSize.width() - futureRect.width());
if (futureRect.maxY() > contentSize.height())
futureRect.setY(contentSize.height() - futureRect.height());
if (futureRect.x() < 0)
futureRect.setX(0);
if (futureRect.y() < 0)
futureRect.setY(0);
return futureRect;
}
#endif // PLATFORM(IOS)
void FrameView::setScrollingPerformanceLoggingEnabled(bool flag)
{
if (TiledBacking* tiledBacking = this->tiledBacking())
tiledBacking->setScrollingPerformanceLoggingEnabled(flag);
}
void FrameView::didAddScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
{
ScrollableArea::didAddScrollbar(scrollbar, orientation);
if (AXObjectCache* cache = axObjectCache())
cache->handleScrollbarUpdate(this);
}
void FrameView::willRemoveScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
{
ScrollableArea::willRemoveScrollbar(scrollbar, orientation);
if (AXObjectCache* cache = axObjectCache()) {
cache->remove(scrollbar);
cache->handleScrollbarUpdate(this);
}
}
void FrameView::addPaintPendingMilestones(LayoutMilestones milestones)
{
m_milestonesPendingPaint |= milestones;
}
void FrameView::fireLayoutRelatedMilestonesIfNeeded()
{
LayoutMilestones requestedMilestones = 0;
LayoutMilestones milestonesAchieved = 0;
Page* page = frame().page();
if (page)
requestedMilestones = page->requestedLayoutMilestones();
if (m_firstLayoutCallbackPending) {
m_firstLayoutCallbackPending = false;
frame().loader().didFirstLayout();
if (requestedMilestones & DidFirstLayout)
milestonesAchieved |= DidFirstLayout;
if (frame().isMainFrame())
page->startCountingRelevantRepaintedObjects();
}
updateIsVisuallyNonEmpty();
// If the layout was done with pending sheets, we are not in fact visually non-empty yet.
if (m_isVisuallyNonEmpty && !frame().document()->didLayoutWithPendingStylesheets() && m_firstVisuallyNonEmptyLayoutCallbackPending) {
m_firstVisuallyNonEmptyLayoutCallbackPending = false;
if (requestedMilestones & DidFirstVisuallyNonEmptyLayout)
milestonesAchieved |= DidFirstVisuallyNonEmptyLayout;
}
if (milestonesAchieved && frame().isMainFrame())
frame().loader().didLayout(milestonesAchieved);
}
void FrameView::firePaintRelatedMilestonesIfNeeded()
{
Page* page = frame().page();
if (!page)
return;
LayoutMilestones milestonesAchieved = 0;
// Make sure the pending paint milestones have actually been requested before we send them.
if (m_milestonesPendingPaint & DidFirstFlushForHeaderLayer) {
if (page->requestedLayoutMilestones() & DidFirstFlushForHeaderLayer)
milestonesAchieved |= DidFirstFlushForHeaderLayer;
}
if (m_milestonesPendingPaint & DidFirstPaintAfterSuppressedIncrementalRendering) {
if (page->requestedLayoutMilestones() & DidFirstPaintAfterSuppressedIncrementalRendering)
milestonesAchieved |= DidFirstPaintAfterSuppressedIncrementalRendering;
}
m_milestonesPendingPaint = 0;
if (milestonesAchieved)
page->mainFrame().loader().didLayout(milestonesAchieved);
}
void FrameView::setVisualUpdatesAllowedByClient(bool visualUpdatesAllowed)
{
if (m_visualUpdatesAllowedByClient == visualUpdatesAllowed)
return;
m_visualUpdatesAllowedByClient = visualUpdatesAllowed;
frame().document()->setVisualUpdatesAllowedByClient(visualUpdatesAllowed);
}
void FrameView::setScrollPinningBehavior(ScrollPinningBehavior pinning)
{
m_scrollPinningBehavior = pinning;
if (ScrollingCoordinator* scrollingCoordinator = frame().page()->scrollingCoordinator())
scrollingCoordinator->setScrollPinningBehavior(pinning);
updateScrollbars(scrollOffset());
}
ScrollBehaviorForFixedElements FrameView::scrollBehaviorForFixedElements() const
{
return frame().settings().backgroundShouldExtendBeyondPage() ? StickToViewportBounds : StickToDocumentBounds;
}
RenderView* FrameView::renderView() const
{
return frame().contentRenderer();
}
int FrameView::mapFromLayoutToCSSUnits(LayoutUnit value) const
{
return value / (frame().pageZoomFactor() * frame().frameScaleFactor());
}
LayoutUnit FrameView::mapFromCSSToLayoutUnits(int value) const
{
return value * frame().pageZoomFactor() * frame().frameScaleFactor();
}
void FrameView::didAddWidgetToRenderTree(Widget& widget)
{
ASSERT(!m_widgetsInRenderTree.contains(&widget));
m_widgetsInRenderTree.add(&widget);
}
void FrameView::willRemoveWidgetFromRenderTree(Widget& widget)
{
ASSERT(m_widgetsInRenderTree.contains(&widget));
m_widgetsInRenderTree.remove(&widget);
}
static Vector<RefPtr<Widget>> collectAndProtectWidgets(const HashSet<Widget*>& set)
{
Vector<RefPtr<Widget>> widgets;
copyToVector(set, widgets);
return widgets;
}
void FrameView::updateWidgetPositions()
{
// updateWidgetPosition() can possibly cause layout to be re-entered (via plug-ins running
// scripts in response to NPP_SetWindow, for example), so we need to keep the Widgets
// alive during enumeration.
auto protectedWidgets = collectAndProtectWidgets(m_widgetsInRenderTree);
for (unsigned i = 0, size = protectedWidgets.size(); i < size; ++i) {
if (RenderWidget* renderWidget = RenderWidget::find(protectedWidgets[i].get()))
renderWidget->updateWidgetPosition();
}
}
void FrameView::notifyWidgets(WidgetNotification notification)
{
auto protectedWidgets = collectAndProtectWidgets(m_widgetsInRenderTree);
for (unsigned i = 0, size = protectedWidgets.size(); i < size; ++i)
protectedWidgets[i]->notifyWidget(notification);
}
void FrameView::setExposedRect(FloatRect exposedRect)
{
if (m_exposedRect == exposedRect)
return;
m_exposedRect = exposedRect;
// FIXME: We should support clipping to the exposed rect for subframes as well.
if (!m_frame->isMainFrame())
return;
if (TiledBacking* tiledBacking = this->tiledBacking()) {
adjustTiledBackingCoverage();
tiledBacking->setTiledScrollingIndicatorPosition(exposedRect.location());
}
if (auto* view = renderView())
view->compositor().scheduleLayerFlush(false /* canThrottle */);
frame().mainFrame().pageOverlayController().didChangeExposedRect();
}
void FrameView::setViewportSizeForCSSViewportUnits(IntSize size)
{
if (m_hasOverrideViewportSize && m_overrideViewportSize == size)
return;
m_overrideViewportSize = size;
m_hasOverrideViewportSize = true;
if (Document* document = m_frame->document())
document->styleResolverChanged(DeferRecalcStyle);
}
IntSize FrameView::viewportSizeForCSSViewportUnits() const
{
if (m_hasOverrideViewportSize)
return m_overrideViewportSize;
return visibleContentRectIncludingScrollbars().size();
}
} // namespace WebCore