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ScrollView.cpp
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ScrollView.cpp
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/*
* Copyright (C) 2006-2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ScrollView.h"
#include "FloatQuad.h"
#include "GraphicsContext.h"
#include "GraphicsLayer.h"
#include "HostWindow.h"
#include "Logging.h"
#include "PlatformMouseEvent.h"
#include "PlatformWheelEvent.h"
#include "ScrollAnimator.h"
#include "Scrollbar.h"
#include "ScrollbarTheme.h"
#include <wtf/HexNumber.h>
#include <wtf/SetForScope.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
ScrollView::ScrollView() = default;
ScrollView::~ScrollView() = default;
void ScrollView::addChild(Widget& child)
{
ASSERT(&child != this);
ASSERT(!child.parent());
child.setParent(this);
m_children.add(child);
if (child.platformWidget())
platformAddChild(&child);
}
void ScrollView::removeChild(Widget& child)
{
ASSERT(child.parent() == this);
child.setParent(nullptr);
m_children.remove(&child);
if (child.platformWidget())
platformRemoveChild(&child);
}
bool ScrollView::setHasHorizontalScrollbar(bool hasBar, bool* contentSizeAffected)
{
return setHasScrollbarInternal(m_horizontalScrollbar, ScrollbarOrientation::Horizontal, hasBar, contentSizeAffected);
}
bool ScrollView::setHasVerticalScrollbar(bool hasBar, bool* contentSizeAffected)
{
return setHasScrollbarInternal(m_verticalScrollbar, ScrollbarOrientation::Vertical, hasBar, contentSizeAffected);
}
bool ScrollView::setHasScrollbarInternal(RefPtr<Scrollbar>& scrollbar, ScrollbarOrientation orientation, bool hasBar, bool* contentSizeAffected)
{
if (hasBar && !scrollbar) {
scrollbar = createScrollbar(orientation);
addChild(*scrollbar);
didAddScrollbar(scrollbar.get(), orientation);
scrollbar->styleChanged();
if (contentSizeAffected)
*contentSizeAffected = !scrollbar->isOverlayScrollbar();
return true;
}
if (!hasBar && scrollbar) {
bool wasOverlayScrollbar = scrollbar->isOverlayScrollbar();
willRemoveScrollbar(scrollbar.get(), orientation);
removeChild(*scrollbar);
scrollbar = nullptr;
if (contentSizeAffected)
*contentSizeAffected = !wasOverlayScrollbar;
return true;
}
return false;
}
Ref<Scrollbar> ScrollView::createScrollbar(ScrollbarOrientation orientation)
{
return Scrollbar::createNativeScrollbar(*this, orientation, ScrollbarControlSize::Regular);
}
void ScrollView::setScrollbarModes(ScrollbarMode horizontalMode, ScrollbarMode verticalMode,
bool horizontalLock, bool verticalLock)
{
bool needsUpdate = false;
if (horizontalMode != horizontalScrollbarMode() && !m_horizontalScrollbarLock) {
m_horizontalScrollbarMode = horizontalMode;
needsUpdate = true;
}
if (verticalMode != verticalScrollbarMode() && !m_verticalScrollbarLock) {
m_verticalScrollbarMode = verticalMode;
needsUpdate = true;
}
if (horizontalLock)
setHorizontalScrollbarLock();
if (verticalLock)
setVerticalScrollbarLock();
if (!needsUpdate)
return;
if (platformWidget())
platformSetScrollbarModes();
else
updateScrollbars(scrollPosition());
}
void ScrollView::scrollbarModes(ScrollbarMode& horizontalMode, ScrollbarMode& verticalMode) const
{
if (platformWidget()) {
platformScrollbarModes(horizontalMode, verticalMode);
return;
}
horizontalMode = m_horizontalScrollbarMode;
verticalMode = m_verticalScrollbarMode;
}
void ScrollView::setCanHaveScrollbars(bool canScroll)
{
ScrollbarMode newHorizontalMode;
ScrollbarMode newVerticalMode;
scrollbarModes(newHorizontalMode, newVerticalMode);
if (canScroll && newVerticalMode == ScrollbarMode::AlwaysOff)
newVerticalMode = ScrollbarMode::Auto;
else if (!canScroll)
newVerticalMode = ScrollbarMode::AlwaysOff;
if (canScroll && newHorizontalMode == ScrollbarMode::AlwaysOff)
newHorizontalMode = ScrollbarMode::Auto;
else if (!canScroll)
newHorizontalMode = ScrollbarMode::AlwaysOff;
setScrollbarModes(newHorizontalMode, newVerticalMode);
}
void ScrollView::setCanBlitOnScroll(bool b)
{
if (platformWidget()) {
platformSetCanBlitOnScroll(b);
return;
}
m_canBlitOnScroll = b;
}
bool ScrollView::canBlitOnScroll() const
{
if (platformWidget())
return platformCanBlitOnScroll();
return m_canBlitOnScroll;
}
void ScrollView::setPaintsEntireContents(bool paintsEntireContents)
{
m_paintsEntireContents = paintsEntireContents;
}
void ScrollView::setDelegatedScrollingMode(DelegatedScrollingMode delegatedScrollingMode)
{
if (m_delegatedScrollingMode == delegatedScrollingMode)
return;
m_delegatedScrollingMode = delegatedScrollingMode;
delegatedScrollingModeDidChange();
}
IntPoint ScrollView::contentsScrollPosition() const
{
#if PLATFORM(IOS_FAMILY)
if (platformWidget())
return actualScrollPosition();
#endif
return scrollPosition();
}
void ScrollView::setContentsScrollPosition(const IntPoint& position, const ScrollPositionChangeOptions& options)
{
#if PLATFORM(IOS_FAMILY)
if (platformWidget())
setActualScrollPosition(position);
#endif
setScrollPosition(position, options);
}
FloatRect ScrollView::exposedContentRect() const
{
#if PLATFORM(IOS_FAMILY)
if (platformWidget())
return platformExposedContentRect();
#endif
const ScrollView* parent = this->parent();
if (!parent)
return m_delegatedScrollingGeometry ? m_delegatedScrollingGeometry->exposedContentRect : FloatRect();
IntRect parentViewExtentContentRect = enclosingIntRect(parent->exposedContentRect());
IntRect selfExtentContentRect = rootViewToContents(parentViewExtentContentRect);
selfExtentContentRect.intersect(boundsRect());
return selfExtentContentRect;
}
void ScrollView::setExposedContentRect(const FloatRect& rect)
{
ASSERT(!platformWidget());
if (!m_delegatedScrollingGeometry)
m_delegatedScrollingGeometry = DelegatedScrollingGeometry();
m_delegatedScrollingGeometry->exposedContentRect = rect;
}
FloatSize ScrollView::unobscuredContentSize() const
{
ASSERT(m_delegatedScrollingGeometry);
if (m_delegatedScrollingGeometry)
return m_delegatedScrollingGeometry->unobscuredContentSize;
return { };
}
void ScrollView::setUnobscuredContentSize(const FloatSize& size)
{
ASSERT(!platformWidget());
if (m_delegatedScrollingGeometry && size == m_delegatedScrollingGeometry->unobscuredContentSize)
return;
if (!m_delegatedScrollingGeometry)
m_delegatedScrollingGeometry = DelegatedScrollingGeometry();
m_delegatedScrollingGeometry->unobscuredContentSize = size;
unobscuredContentSizeChanged();
}
IntRect ScrollView::unobscuredContentRect(VisibleContentRectIncludesScrollbars scrollbarInclusion) const
{
if (platformWidget())
return platformUnobscuredContentRect(scrollbarInclusion);
if (m_delegatedScrollingGeometry)
return IntRect(m_scrollPosition, roundedIntSize(m_delegatedScrollingGeometry->unobscuredContentSize));
return unobscuredContentRectInternal(scrollbarInclusion);
}
IntRect ScrollView::unobscuredContentRectInternal(VisibleContentRectIncludesScrollbars scrollbarInclusion) const
{
FloatSize visibleContentSize = sizeForUnobscuredContent(scrollbarInclusion);
visibleContentSize.scale(1 / visibleContentScaleFactor());
return IntRect(m_scrollPosition, expandedIntSize(visibleContentSize));
}
IntSize ScrollView::sizeForVisibleContent(VisibleContentRectIncludesScrollbars scrollbarInclusion) const
{
if (platformWidget())
return platformVisibleContentSizeIncludingObscuredArea(scrollbarInclusion == IncludeScrollbars);
#if USE(COORDINATED_GRAPHICS)
if (m_useFixedLayout && !m_fixedVisibleContentRect.isEmpty())
return m_fixedVisibleContentRect.size();
#endif
IntSize scrollbarSpace;
if (scrollbarInclusion == ExcludeScrollbars)
scrollbarSpace = scrollbarIntrusion();
return IntSize(width() - scrollbarSpace.width(), height() - scrollbarSpace.height()).expandedTo(IntSize());
}
IntSize ScrollView::sizeForUnobscuredContent(VisibleContentRectIncludesScrollbars scrollbarInclusion) const
{
if (platformWidget())
return platformVisibleContentSize(scrollbarInclusion == IncludeScrollbars);
IntSize visibleContentSize = sizeForVisibleContent(scrollbarInclusion);
#if USE(COORDINATED_GRAPHICS)
if (m_useFixedLayout && !m_fixedVisibleContentRect.isEmpty())
return visibleContentSize;
#endif
visibleContentSize.setHeight(visibleContentSize.height() - topContentInset());
return visibleContentSize;
}
IntRect ScrollView::visibleContentRectInternal(VisibleContentRectIncludesScrollbars scrollbarInclusion, VisibleContentRectBehavior visibleContentRectBehavior) const
{
#if PLATFORM(IOS_FAMILY)
if (visibleContentRectBehavior == LegacyIOSDocumentViewRect) {
if (platformWidget())
return platformVisibleContentRect(scrollbarInclusion == IncludeScrollbars);
}
if (platformWidget())
return unobscuredContentRect(scrollbarInclusion);
#else
UNUSED_PARAM(visibleContentRectBehavior);
#endif
if (platformWidget())
return platformVisibleContentRect(scrollbarInclusion == IncludeScrollbars);
#if USE(COORDINATED_GRAPHICS)
if (m_useFixedLayout && !m_fixedVisibleContentRect.isEmpty())
return m_fixedVisibleContentRect;
#endif
return unobscuredContentRect(scrollbarInclusion);
}
IntSize ScrollView::layoutSize() const
{
return m_fixedLayoutSize.isEmpty() || !m_useFixedLayout ? sizeForUnobscuredContent() : m_fixedLayoutSize;
}
IntSize ScrollView::fixedLayoutSize() const
{
return m_fixedLayoutSize;
}
void ScrollView::setFixedLayoutSize(const IntSize& newSize)
{
if (fixedLayoutSize() == newSize)
return;
LOG_WITH_STREAM(Layout, stream << "ScrollView " << this << " setFixedLayoutSize " << newSize);
m_fixedLayoutSize = newSize;
if (m_useFixedLayout)
availableContentSizeChanged(AvailableSizeChangeReason::AreaSizeChanged);
}
bool ScrollView::useFixedLayout() const
{
return m_useFixedLayout;
}
void ScrollView::setUseFixedLayout(bool enable)
{
if (useFixedLayout() == enable)
return;
m_useFixedLayout = enable;
if (!m_fixedLayoutSize.isEmpty())
availableContentSizeChanged(AvailableSizeChangeReason::AreaSizeChanged);
}
void ScrollView::availableContentSizeChanged(AvailableSizeChangeReason reason)
{
ScrollableArea::availableContentSizeChanged(reason);
if (platformWidget())
return;
if (reason != AvailableSizeChangeReason::ScrollbarsChanged)
updateScrollbars(scrollPosition());
}
IntSize ScrollView::contentsSize() const
{
return m_contentsSize;
}
void ScrollView::setContentsSize(const IntSize& newSize)
{
if (contentsSize() == newSize)
return;
m_contentsSize = newSize;
if (platformWidget())
platformSetContentsSize();
else if (!m_prohibitsScrollingWhenChangingContentSizeCount)
updateScrollbars(scrollPosition());
updateOverhangAreas();
}
ScrollPosition ScrollView::maximumScrollPosition() const
{
ScrollPosition maximumPosition = ScrollableArea::maximumScrollPosition();
// FIXME: can this be moved into the base class?
maximumPosition.clampNegativeToZero();
return maximumPosition;
}
ScrollPosition ScrollView::adjustScrollPositionWithinRange(const ScrollPosition& scrollPosition) const
{
if (scrollClamping() == ScrollClamping::Unclamped || m_allowsUnclampedScrollPosition)
return scrollPosition;
return scrollPosition.constrainedBetween(minimumScrollPosition(), maximumScrollPosition());
}
ScrollPosition ScrollView::documentScrollPositionRelativeToViewOrigin() const
{
return scrollPosition() - IntSize(
shouldPlaceVerticalScrollbarOnLeft() && m_verticalScrollbar ? m_verticalScrollbar->occupiedWidth() : 0,
headerHeight() + topContentInset(TopContentInsetType::WebCoreOrPlatformContentInset));
}
ScrollPosition ScrollView::documentScrollPositionRelativeToScrollableAreaOrigin() const
{
return scrollPosition() - IntSize(0, headerHeight());
}
void ScrollView::setScrollOffset(const ScrollOffset& offset)
{
LOG_WITH_STREAM(Scrolling, stream << "\nScrollView::setScrollOffset " << offset << " clamping " << scrollClamping());
auto constrainedOffset = offset;
if (scrollClamping() == ScrollClamping::Clamped)
constrainedOffset = constrainedOffset.constrainedBetween(minimumScrollOffset(), maximumScrollOffset());
scrollTo(scrollPositionFromOffset(constrainedOffset));
}
void ScrollView::scrollOffsetChangedViaPlatformWidget(const ScrollOffset& oldOffset, const ScrollOffset& newOffset)
{
// We should not attempt to actually modify (paint) platform widgets if the layout phase
// is not complete. Instead, defer the scroll event until the layout finishes.
if (shouldDeferScrollUpdateAfterContentSizeChange()) {
// We only care about the most recent scroll position change request
m_deferredScrollOffsets = std::make_pair(oldOffset, newOffset);
return;
}
scrollOffsetChangedViaPlatformWidgetImpl(oldOffset, newOffset);
scrollAnimator().setCurrentPosition(scrollPosition());
}
void ScrollView::handleDeferredScrollUpdateAfterContentSizeChange()
{
ASSERT(!shouldDeferScrollUpdateAfterContentSizeChange());
if (!m_deferredScrollDelta && !m_deferredScrollOffsets)
return;
ASSERT(static_cast<bool>(m_deferredScrollDelta) != static_cast<bool>(m_deferredScrollOffsets));
if (m_deferredScrollDelta)
completeUpdatesAfterScrollTo(m_deferredScrollDelta.value());
else if (m_deferredScrollOffsets)
scrollOffsetChangedViaPlatformWidgetImpl(m_deferredScrollOffsets.value().first, m_deferredScrollOffsets.value().second);
m_deferredScrollDelta = std::nullopt;
m_deferredScrollOffsets = std::nullopt;
}
void ScrollView::scrollTo(const ScrollPosition& newPosition)
{
LOG_WITH_STREAM(Scrolling, stream << "ScrollView::scrollTo " << newPosition << " min: " << minimumScrollPosition() << " max: " << maximumScrollPosition());
IntSize scrollDelta = newPosition - m_scrollPosition;
if (scrollDelta.isZero())
return;
if (platformWidget()) {
platformSetScrollPosition(newPosition);
return;
}
m_scrollPosition = newPosition;
if (scrollbarsSuppressed())
return;
#if USE(COORDINATED_GRAPHICS)
if (delegatesScrolling()) {
requestScrollPositionUpdate(newPosition);
return;
}
#endif
// We should not attempt to actually modify layer contents if the layout phase
// is not complete. Instead, defer the scroll event until the layout finishes.
if (shouldDeferScrollUpdateAfterContentSizeChange()) {
ASSERT(!m_deferredScrollDelta);
m_deferredScrollDelta = scrollDelta;
return;
}
completeUpdatesAfterScrollTo(scrollDelta);
}
void ScrollView::completeUpdatesAfterScrollTo(const IntSize& scrollDelta)
{
updateLayerPositionsAfterScrolling();
scrollContents(scrollDelta);
updateCompositingLayersAfterScrolling();
}
void ScrollView::setScrollPosition(const ScrollPosition& scrollPosition, const ScrollPositionChangeOptions& options)
{
LOG_WITH_STREAM(Scrolling, stream << "ScrollView::setScrollPosition " << scrollPosition);
if (prohibitsScrolling())
return;
if (scrollAnimationStatus() == ScrollAnimationStatus::Animating) {
scrollAnimator().cancelAnimations();
stopAsyncAnimatedScroll();
}
if (platformWidget()) {
platformSetScrollPosition(scrollPosition);
return;
}
ScrollPosition newScrollPosition = (!delegatesScrollingToNativeView() && options.clamping == ScrollClamping::Clamped) ? adjustScrollPositionWithinRange(scrollPosition) : scrollPosition;
if ((!delegatesScrollingToNativeView() || currentScrollType() == ScrollType::User) && newScrollPosition == this->scrollPosition()) {
LOG_WITH_STREAM(Scrolling, stream << "ScrollView::setScrollPosition " << scrollPosition << " return for no change");
return;
}
if (!requestScrollPositionUpdate(newScrollPosition, currentScrollType(), options.clamping))
updateScrollbars(newScrollPosition);
}
bool ScrollView::scroll(ScrollDirection direction, ScrollGranularity granularity)
{
if (platformWidget())
return platformScroll(direction, granularity);
return ScrollableArea::scroll(direction, granularity);
}
bool ScrollView::logicalScroll(ScrollLogicalDirection direction, ScrollGranularity granularity)
{
return scroll(logicalToPhysical(direction, isVerticalDocument(), isFlippedDocument()), granularity);
}
IntSize ScrollView::overhangAmount() const
{
IntSize stretch;
// FIXME: use maximumScrollOffset()
ScrollOffset scrollOffset = this->scrollOffset();
if (scrollOffset.y() < 0)
stretch.setHeight(scrollOffset.y());
else if (totalContentsSize().height() && scrollOffset.y() > totalContentsSize().height() - visibleHeight())
stretch.setHeight(scrollOffset.y() - (totalContentsSize().height() - visibleHeight()));
if (scrollOffset.x() < 0)
stretch.setWidth(scrollOffset.x());
else if (contentsWidth() && scrollOffset.x() > contentsWidth() - visibleWidth())
stretch.setWidth(scrollOffset.x() - (contentsWidth() - visibleWidth()));
return stretch;
}
bool ScrollView::managesScrollbars() const
{
#if PLATFORM(IOS_FAMILY)
// FIXME: We should be able to remove this. iOS should always hit the DelegatedToNativeScrollView condition below.
return false;
#else
if (platformWidget())
return false;
if (delegatedScrollingMode() == DelegatedScrollingMode::DelegatedToNativeScrollView)
return false;
return true;
#endif
}
void ScrollView::updateScrollbars(const ScrollPosition& desiredPosition)
{
LOG_WITH_STREAM(Layout, stream << "ScrollView " << this << " updateScrollbars " << desiredPosition << " horizontalScrollbarMode " << m_horizontalScrollbarMode << " verticalScrollbarMode " << m_verticalScrollbarMode);
if (m_inUpdateScrollbars || prohibitsScrolling() || platformWidget())
return;
auto scrollToPosition = [&](ScrollPosition desiredPosition) {
auto adjustedScrollPosition = desiredPosition;
if (!isRubberBandInProgress())
adjustedScrollPosition = adjustScrollPositionWithinRange(adjustedScrollPosition);
if (adjustedScrollPosition != scrollPosition() || scrollOriginChanged()) {
ScrollableArea::scrollToPositionWithoutAnimation(adjustedScrollPosition);
resetScrollOriginChanged();
}
};
if (!managesScrollbars()) {
scrollToPosition(desiredPosition);
return;
}
bool scrollbarCanTakeSpace = canShowNonOverlayScrollbars();
// If we came in here with the view already needing a layout then do that first.
// (This will be the common case, e.g., when the page changes due to window resizing for example).
// This layout will not re-enter updateScrollbars and does not count towards our max layout pass total.
if (!m_scrollbarsSuppressed && scrollbarCanTakeSpace) {
SetForScope inUpdateScrollbarsScope(m_inUpdateScrollbars, true, false);
updateContentsSize();
}
IntRect oldScrollCornerRect = scrollCornerRect();
bool hasHorizontalScrollbar = m_horizontalScrollbar;
bool hasVerticalScrollbar = m_verticalScrollbar;
bool newHasHorizontalScrollbar = hasHorizontalScrollbar;
bool newHasVerticalScrollbar = hasVerticalScrollbar;
ScrollbarMode hScroll = m_horizontalScrollbarMode;
ScrollbarMode vScroll = m_verticalScrollbarMode;
if (hScroll != ScrollbarMode::Auto)
newHasHorizontalScrollbar = (hScroll == ScrollbarMode::AlwaysOn);
if (vScroll != ScrollbarMode::Auto)
newHasVerticalScrollbar = (vScroll == ScrollbarMode::AlwaysOn);
bool scrollbarAddedOrRemoved = false;
if (m_scrollbarsSuppressed || (hScroll != ScrollbarMode::Auto && vScroll != ScrollbarMode::Auto)) {
if (hasHorizontalScrollbar != newHasHorizontalScrollbar) {
if (setHasHorizontalScrollbar(newHasHorizontalScrollbar))
scrollbarAddedOrRemoved = true;
}
if (hasVerticalScrollbar != newHasVerticalScrollbar) {
if (setHasVerticalScrollbar(newHasVerticalScrollbar))
scrollbarAddedOrRemoved = true;
}
} else {
bool sendContentResizedNotification = false;
IntSize docSize = totalContentsSize();
IntSize fullVisibleSize = unobscuredContentRectIncludingScrollbars().size();
LOG_WITH_STREAM(Layout, stream << "ScrollView " << this << " updateScrollbars - docSize " << docSize << " visible size " << visibleSize() << " fullVisibleSize " << fullVisibleSize);
if (hScroll == ScrollbarMode::Auto)
newHasHorizontalScrollbar = docSize.width() > visibleWidth();
if (vScroll == ScrollbarMode::Auto)
newHasVerticalScrollbar = docSize.height() > visibleHeight();
bool needAnotherPass = false;
if (scrollbarCanTakeSpace) {
// If we ever turn one scrollbar off, do not turn the other one on. Never ever
// try to both gain/lose a scrollbar in the same pass.
if (!m_updateScrollbarsPass && docSize.width() <= fullVisibleSize.width() && docSize.height() <= fullVisibleSize.height()) {
if (hScroll == ScrollbarMode::Auto)
newHasHorizontalScrollbar = false;
if (vScroll == ScrollbarMode::Auto)
newHasVerticalScrollbar = false;
}
if (!newHasHorizontalScrollbar && hasHorizontalScrollbar && vScroll != ScrollbarMode::AlwaysOn && !hasVerticalScrollbar) {
newHasVerticalScrollbar = false;
needAnotherPass = true;
}
if (!newHasVerticalScrollbar && hasVerticalScrollbar && hScroll != ScrollbarMode::AlwaysOn && !hasHorizontalScrollbar) {
newHasHorizontalScrollbar = false;
needAnotherPass = true;
}
}
if (hasHorizontalScrollbar != newHasHorizontalScrollbar) {
if (scrollOrigin().y() && !newHasHorizontalScrollbar)
ScrollableArea::setScrollOrigin(IntPoint(scrollOrigin().x(), scrollOrigin().y() - m_horizontalScrollbar->occupiedHeight()));
if (m_horizontalScrollbar)
m_horizontalScrollbar->invalidate();
bool changeAffectsContentSize = false;
if (setHasHorizontalScrollbar(newHasHorizontalScrollbar, &changeAffectsContentSize)) {
scrollbarAddedOrRemoved = true;
sendContentResizedNotification |= changeAffectsContentSize;
}
}
if (hasVerticalScrollbar != newHasVerticalScrollbar) {
if (scrollOrigin().x() && !newHasVerticalScrollbar)
ScrollableArea::setScrollOrigin(IntPoint(scrollOrigin().x() - m_verticalScrollbar->occupiedWidth(), scrollOrigin().y()));
if (m_verticalScrollbar)
m_verticalScrollbar->invalidate();
bool changeAffectsContentSize = false;
if (setHasVerticalScrollbar(newHasVerticalScrollbar, &changeAffectsContentSize)) {
scrollbarAddedOrRemoved = true;
sendContentResizedNotification |= changeAffectsContentSize;
}
}
const unsigned cMaxUpdateScrollbarsPass = 3;
if ((sendContentResizedNotification || needAnotherPass) && m_updateScrollbarsPass < cMaxUpdateScrollbarsPass) {
m_updateScrollbarsPass++;
availableContentSizeChanged(AvailableSizeChangeReason::ScrollbarsChanged);
updateContentsSize();
IntSize newDocSize = totalContentsSize();
if (newDocSize == docSize) {
// The layout with the new scroll state had no impact on
// the document's overall size, so updateScrollbars didn't get called.
// Recur manually.
updateScrollbars(desiredPosition);
}
m_updateScrollbarsPass--;
}
}
if (scrollbarAddedOrRemoved)
addedOrRemovedScrollbar();
// Set up the range (and page step/line step), but only do this if we're not in a nested call (to avoid
// doing it multiple times).
if (m_updateScrollbarsPass)
return;
SetForScope inUpdateScrollbarsScope(m_inUpdateScrollbars, true, false);
if (m_horizontalScrollbar) {
int clientWidth = visibleWidth();
IntRect oldRect(m_horizontalScrollbar->frameRect());
IntRect hBarRect(shouldPlaceVerticalScrollbarOnLeft() && m_verticalScrollbar ? m_verticalScrollbar->occupiedWidth() : 0,
height() - m_horizontalScrollbar->height(),
width() - (m_verticalScrollbar ? m_verticalScrollbar->occupiedWidth() : 0),
m_horizontalScrollbar->height());
m_horizontalScrollbar->setFrameRect(hBarRect);
if (!m_scrollbarsSuppressed && oldRect != m_horizontalScrollbar->frameRect())
m_horizontalScrollbar->invalidate();
if (m_scrollbarsSuppressed)
m_horizontalScrollbar->setSuppressInvalidation(true);
m_horizontalScrollbar->setEnabled(contentsWidth() > clientWidth);
m_horizontalScrollbar->setProportion(clientWidth, contentsWidth());
if (m_scrollbarsSuppressed)
m_horizontalScrollbar->setSuppressInvalidation(false);
}
if (m_verticalScrollbar) {
int clientHeight = visibleHeight();
IntRect oldRect(m_verticalScrollbar->frameRect());
IntRect vBarRect(shouldPlaceVerticalScrollbarOnLeft() ? 0 : width() - m_verticalScrollbar->width(),
topContentInset(),
m_verticalScrollbar->width(),
height() - topContentInset() - (m_horizontalScrollbar ? m_horizontalScrollbar->occupiedHeight() : 0));
m_verticalScrollbar->setFrameRect(vBarRect);
if (!m_scrollbarsSuppressed && oldRect != m_verticalScrollbar->frameRect())
m_verticalScrollbar->invalidate();
if (m_scrollbarsSuppressed)
m_verticalScrollbar->setSuppressInvalidation(true);
m_verticalScrollbar->setEnabled(totalContentsSize().height() > clientHeight);
m_verticalScrollbar->setProportion(clientHeight, totalContentsSize().height());
if (m_scrollbarsSuppressed)
m_verticalScrollbar->setSuppressInvalidation(false);
}
updateScrollbarSteps();
if (hasHorizontalScrollbar != newHasHorizontalScrollbar || hasVerticalScrollbar != newHasVerticalScrollbar) {
// FIXME: Is frameRectsChanged really necessary here? Have any frame rects changed?
frameRectsChanged();
positionScrollbarLayers();
updateScrollCorner();
if (!m_horizontalScrollbar && !m_verticalScrollbar)
invalidateScrollCornerRect(oldScrollCornerRect);
}
scrollToPosition(desiredPosition);
// Make sure the scrollbar offsets are up to date.
if (m_horizontalScrollbar)
m_horizontalScrollbar->offsetDidChange();
if (m_verticalScrollbar)
m_verticalScrollbar->offsetDidChange();
}
void ScrollView::updateScrollbarSteps()
{
if (m_horizontalScrollbar)
m_horizontalScrollbar->setSteps(Scrollbar::pixelsPerLineStep(visibleWidth()), Scrollbar::pageStep(visibleWidth()));
if (m_verticalScrollbar)
m_verticalScrollbar->setSteps(Scrollbar::pixelsPerLineStep(visibleHeight()), Scrollbar::pageStep(visibleHeight()));
}
const int panIconSizeLength = 16;
IntRect ScrollView::rectToCopyOnScroll() const
{
IntRect scrollViewRect = convertToRootView(IntRect(0, 0, visibleWidth(), visibleHeight()));
if (hasOverlayScrollbars()) {
int verticalScrollbarWidth = (verticalScrollbar() && !hasLayerForVerticalScrollbar()) ? verticalScrollbar()->width() : 0;
int horizontalScrollbarHeight = (horizontalScrollbar() && !hasLayerForHorizontalScrollbar()) ? horizontalScrollbar()->height() : 0;
scrollViewRect.setWidth(scrollViewRect.width() - verticalScrollbarWidth);
scrollViewRect.setHeight(scrollViewRect.height() - horizontalScrollbarHeight);
}
return scrollViewRect;
}
void ScrollView::scrollContents(const IntSize& scrollDelta)
{
HostWindow* window = hostWindow();
if (!window)
return;
// Since scrolling is double buffered, we will be blitting the scroll view's intersection
// with the clip rect every time to keep it smooth.
IntRect clipRect = windowClipRect();
IntRect scrollViewRect = rectToCopyOnScroll();
IntRect updateRect = clipRect;
updateRect.intersect(scrollViewRect);
// Invalidate the root view (not the backing store).
window->invalidateRootView(updateRect);
if (m_drawPanScrollIcon) {
// FIXME: the pan icon is broken when accelerated compositing is on, since it will draw under the compositing layers.
// https://bugs.webkit.org/show_bug.cgi?id=47837
int panIconDirtySquareSizeLength = 2 * (panIconSizeLength + std::max(abs(scrollDelta.width()), abs(scrollDelta.height()))); // We only want to repaint what's necessary
IntPoint panIconDirtySquareLocation = IntPoint(m_panScrollIconPoint.x() - (panIconDirtySquareSizeLength / 2), m_panScrollIconPoint.y() - (panIconDirtySquareSizeLength / 2));
IntRect panScrollIconDirtyRect = IntRect(panIconDirtySquareLocation, IntSize(panIconDirtySquareSizeLength, panIconDirtySquareSizeLength));
panScrollIconDirtyRect.intersect(clipRect);
window->invalidateContentsAndRootView(panScrollIconDirtyRect);
}
if (canBlitOnScroll()) { // The main frame can just blit the WebView window
// FIXME: Find a way to scroll subframes with this faster path
if (!scrollContentsFastPath(-scrollDelta, scrollViewRect, clipRect))
scrollContentsSlowPath(updateRect);
} else {
// We need to repaint the entire backing store. Do it now before moving the windowed plugins.
scrollContentsSlowPath(updateRect);
}
// Invalidate the overhang areas if they are visible.
updateOverhangAreas();
// This call will move children with native widgets (plugins) and invalidate them as well.
frameRectsChanged();
// Now blit the backingstore into the window which should be very fast.
window->invalidateRootView(IntRect());
}
void ScrollView::scrollContentsSlowPath(const IntRect& updateRect)
{
hostWindow()->invalidateContentsForSlowScroll(updateRect);
}
IntPoint ScrollView::viewToContents(const IntPoint& point) const
{
if (delegatesScrollingToNativeView())
return point;
return point + toIntSize(documentScrollPositionRelativeToViewOrigin());
}
IntPoint ScrollView::contentsToView(const IntPoint& point) const
{
if (delegatesScrollingToNativeView())
return point;
return point - toIntSize(documentScrollPositionRelativeToViewOrigin());
}
FloatPoint ScrollView::viewToContents(const FloatPoint& point) const
{
if (delegatesScrollingToNativeView())
return point;
return viewToContents(IntPoint(point));
}
FloatPoint ScrollView::contentsToView(const FloatPoint& point) const
{
if (delegatesScrollingToNativeView())
return point;
return point - toFloatSize(documentScrollPositionRelativeToViewOrigin());
}
IntRect ScrollView::viewToContents(IntRect rect) const
{
if (delegatesScrollingToNativeView())
return rect;
rect.moveBy(documentScrollPositionRelativeToViewOrigin());
return rect;
}
FloatRect ScrollView::viewToContents(FloatRect rect) const
{
if (delegatesScrollingToNativeView())
return rect;
rect.moveBy(documentScrollPositionRelativeToViewOrigin());
return rect;
}
IntRect ScrollView::contentsToView(IntRect rect) const
{
if (delegatesScrollingToNativeView())
return rect;
rect.moveBy(-documentScrollPositionRelativeToViewOrigin());
return rect;
}
FloatRect ScrollView::contentsToView(FloatRect rect) const
{
if (delegatesScrollingToNativeView())
return rect;
rect.moveBy(-documentScrollPositionRelativeToViewOrigin());
return rect;
}
IntPoint ScrollView::contentsToContainingViewContents(const IntPoint& point) const
{
if (const ScrollView* parentScrollView = parent()) {
IntPoint pointInContainingView = convertToContainingView(contentsToView(point));
return parentScrollView->viewToContents(pointInContainingView);
}
return contentsToView(point);
}
IntRect ScrollView::contentsToContainingViewContents(IntRect rect) const
{
if (const ScrollView* parentScrollView = parent()) {
IntRect rectInContainingView = convertToContainingView(contentsToView(rect));
return parentScrollView->viewToContents(rectInContainingView);
}
return contentsToView(rect);
}
FloatPoint ScrollView::rootViewToContents(const FloatPoint& rootViewPoint) const
{
return viewToContents(convertFromRootView(rootViewPoint));
}
IntPoint ScrollView::rootViewToContents(const IntPoint& rootViewPoint) const
{
return viewToContents(convertFromRootView(rootViewPoint));
}
IntPoint ScrollView::contentsToRootView(const IntPoint& contentsPoint) const
{
return convertToRootView(contentsToView(contentsPoint));
}
FloatPoint ScrollView::contentsToRootView(const FloatPoint& contentsPoint) const
{
return convertToRootView(contentsToView(contentsPoint));
}
IntRect ScrollView::rootViewToContents(const IntRect& rootViewRect) const
{
return viewToContents(convertFromRootView(rootViewRect));
}
FloatRect ScrollView::rootViewToContents(const FloatRect& rootViewRect) const
{
return viewToContents(convertFromRootView(rootViewRect));
}
FloatRect ScrollView::contentsToRootView(const FloatRect& contentsRect) const
{
return convertToRootView(contentsToView(contentsRect));
}
FloatQuad ScrollView::rootViewToContents(const FloatQuad& quad) const
{
// FIXME: This could be optimized by adding and adopting a version of rootViewToContents() that
// maps multiple FloatPoints to content coordinates at the same time.
auto result = quad;
result.setP1(rootViewToContents(result.p1()));
result.setP2(rootViewToContents(result.p2()));
result.setP3(rootViewToContents(result.p3()));