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Unified Diff: third_party/WebKit/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp

Issue 1357423007: Avoid scrollbar construction/destruction thrashing during flex layout. (Closed) Base URL: https://chromium.googlesource.com/chromium/src@master
Patch Set: Comment fixes. Created 5 years, 3 months ago
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Index: third_party/WebKit/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
index 7f23aa54fe791c3f63dc5aa6d0b9e115c2104ec2..616ad1964fcf455198d94ba86c31977e90b7b0cf 100644
--- a/third_party/WebKit/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
@@ -88,6 +88,7 @@ DeprecatedPaintLayerScrollableArea::DeprecatedPaintLayerScrollableArea(Deprecate
, m_nextTopmostScrollChild(0)
, m_topmostScrollChild(0)
, m_needsCompositedScrolling(false)
+ , m_scrollbarManager(*this)
, m_scrollCorner(nullptr)
, m_resizer(nullptr)
#if ENABLE(ASSERT)
@@ -142,8 +143,7 @@ void DeprecatedPaintLayerScrollableArea::dispose()
frameView->removeResizerArea(box());
}
- destroyScrollbar(HorizontalScrollbar);
- destroyScrollbar(VerticalScrollbar);
+ m_scrollbarManager.dispose();
if (m_scrollCorner)
m_scrollCorner->destroy();
@@ -159,8 +159,7 @@ void DeprecatedPaintLayerScrollableArea::dispose()
DEFINE_TRACE(DeprecatedPaintLayerScrollableArea)
{
- visitor->trace(m_hBar);
- visitor->trace(m_vBar);
+ m_scrollbarManager.trace(visitor);
ScrollableArea::trace(visitor);
}
@@ -205,15 +204,15 @@ void DeprecatedPaintLayerScrollableArea::invalidateScrollbarRect(Scrollbar* scro
// See crbug.com/343132.
DisableCompositingQueryAsserts disabler;
- ASSERT(scrollbar == m_hBar.get() || scrollbar == m_vBar.get());
- ASSERT(scrollbar == m_hBar.get() ? !layerForHorizontalScrollbar() : !layerForVerticalScrollbar());
+ ASSERT(scrollbar == horizontalScrollbar() || scrollbar == verticalScrollbar());
+ ASSERT(scrollbar == horizontalScrollbar() ? !layerForHorizontalScrollbar() : !layerForVerticalScrollbar());
IntRect scrollRect = rect;
// If we are not yet inserted into the tree, there is no need to issue paint invaldiations.
if (!box().isLayoutView() && !box().parent())
return;
- if (scrollbar == m_vBar.get())
+ if (scrollbar == verticalScrollbar())
scrollRect.move(verticalScrollbarStart(0, box().size().width()), box().borderTop());
else
scrollRect.move(horizontalScrollbarStart(0), box().size().height() - box().borderBottom() - scrollbar->height());
@@ -653,12 +652,13 @@ void DeprecatedPaintLayerScrollableArea::updateScrollDimensions(DoubleSize& scro
ASSERT(box().hasOverflowClip());
if (needsScrollbarReconstruction()) {
- if (m_hBar)
- destroyScrollbar(HorizontalScrollbar);
- if (m_vBar)
- destroyScrollbar(VerticalScrollbar);
+ m_scrollbarManager.setCanDetachScrollbars(false);
+ setHasHorizontalScrollbar(false);
+ setHasVerticalScrollbar(false);
}
+ m_scrollbarManager.setCanDetachScrollbars(true);
+
scrollOffset = adjustedScrollOffset();
computeScrollDimensions();
bool hasHorizontalOverflow = this->hasHorizontalOverflow();
@@ -674,10 +674,14 @@ void DeprecatedPaintLayerScrollableArea::updateScrollDimensions(DoubleSize& scro
autoHorizontalScrollBarChanged = (box().hasAutoHorizontalScrollbar() && (hasHorizontalScrollbar() != hasHorizontalOverflow)) || (box().style()->overflowX() == OSCROLL && !horizontalScrollbar());
autoVerticalScrollBarChanged = (box().hasAutoVerticalScrollbar() && (hasVerticalScrollbar() != hasVerticalOverflow)) || (box().style()->overflowY() == OSCROLL && !verticalScrollbar());
if (!visualViewportSuppliesScrollbars() && (autoHorizontalScrollBarChanged || autoVerticalScrollBarChanged)) {
- if (box().hasAutoHorizontalScrollbar() || (box().style()->overflowX() == OSCROLL && !horizontalScrollbar()))
- setHasHorizontalScrollbar(box().style()->overflowX() == OSCROLL ? true : hasHorizontalOverflow);
- if (box().hasAutoVerticalScrollbar() || (box().style()->overflowY() == OSCROLL && !verticalScrollbar()))
- setHasVerticalScrollbar(box().style()->overflowY() == OSCROLL ? true : hasVerticalOverflow);
+ if (box().hasAutoHorizontalScrollbar())
+ setHasHorizontalScrollbar(hasHorizontalOverflow);
+ else if (box().style()->overflowX() == OSCROLL)
+ setHasHorizontalScrollbar(true);
+ if (box().hasAutoVerticalScrollbar())
+ setHasVerticalScrollbar(hasVerticalOverflow);
+ else if (box().style()->overflowX() == OSCROLL)
+ setHasVerticalScrollbar(true);
}
}
@@ -696,6 +700,8 @@ void DeprecatedPaintLayerScrollableArea::finalizeScrollDimensions(const DoubleSi
scrollPositionChanged(-origin + adjustedScrollOffset(), ProgrammaticScroll);
}
+ m_scrollbarManager.setCanDetachScrollbars(false);
+
bool hasHorizontalOverflow = this->hasHorizontalOverflow();
bool hasVerticalOverflow = this->hasVerticalOverflow();
@@ -851,19 +857,19 @@ void DeprecatedPaintLayerScrollableArea::updateAfterStyleChange(const ComputedSt
// When switching to another value, we need to re-enable them (see bug 11985).
if (needsHorizontalScrollbar && oldStyle && oldStyle->overflowX() == OSCROLL && overflowX != OSCROLL) {
ASSERT(hasHorizontalScrollbar());
- m_hBar->setEnabled(true);
+ horizontalScrollbar()->setEnabled(true);
}
if (needsVerticalScrollbar && oldStyle && oldStyle->overflowY() == OSCROLL && overflowY != OSCROLL) {
ASSERT(hasVerticalScrollbar());
- m_vBar->setEnabled(true);
+ verticalScrollbar()->setEnabled(true);
}
// FIXME: Need to detect a swap from custom to native scrollbars (and vice versa).
- if (m_hBar)
- m_hBar->styleChanged();
- if (m_vBar)
- m_vBar->styleChanged();
+ if (horizontalScrollbar())
+ horizontalScrollbar()->styleChanged();
+ if (verticalScrollbar())
+ verticalScrollbar()->styleChanged();
updateScrollCornerStyle();
updateResizerAreaSet();
@@ -901,27 +907,27 @@ void DeprecatedPaintLayerScrollableArea::updateAfterOverflowRecalc()
IntRect DeprecatedPaintLayerScrollableArea::rectForHorizontalScrollbar(const IntRect& borderBoxRect) const
{
- if (!m_hBar)
+ if (!hasHorizontalScrollbar())
return IntRect();
const IntRect& scrollCorner = scrollCornerRect();
return IntRect(horizontalScrollbarStart(borderBoxRect.x()),
- borderBoxRect.maxY() - box().borderBottom() - m_hBar->height(),
+ borderBoxRect.maxY() - box().borderBottom() - horizontalScrollbar()->height(),
borderBoxRect.width() - (box().borderLeft() + box().borderRight()) - scrollCorner.width(),
- m_hBar->height());
+ horizontalScrollbar()->height());
}
IntRect DeprecatedPaintLayerScrollableArea::rectForVerticalScrollbar(const IntRect& borderBoxRect) const
{
- if (!m_vBar)
+ if (!hasVerticalScrollbar())
return IntRect();
const IntRect& scrollCorner = scrollCornerRect();
return IntRect(verticalScrollbarStart(borderBoxRect.x(), borderBoxRect.maxX()),
borderBoxRect.y() + box().borderTop(),
- m_vBar->width(),
+ verticalScrollbar()->width(),
borderBoxRect.height() - (box().borderTop() + box().borderBottom()) - scrollCorner.height());
}
@@ -929,23 +935,23 @@ LayoutUnit DeprecatedPaintLayerScrollableArea::verticalScrollbarStart(int minX,
{
if (box().style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft())
return minX + box().borderLeft();
- return maxX - box().borderRight() - m_vBar->width();
+ return maxX - box().borderRight() - verticalScrollbar()->width();
}
LayoutUnit DeprecatedPaintLayerScrollableArea::horizontalScrollbarStart(int minX) const
{
int x = minX + box().borderLeft();
if (box().style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft())
- x += m_vBar ? m_vBar->width() : resizerCornerRect(box().pixelSnappedBorderBoxRect(), ResizerForPointer).width();
+ x += hasVerticalScrollbar() ? verticalScrollbar()->width() : resizerCornerRect(box().pixelSnappedBorderBoxRect(), ResizerForPointer).width();
return x;
}
IntSize DeprecatedPaintLayerScrollableArea::scrollbarOffset(const Scrollbar* scrollbar) const
{
- if (scrollbar == m_vBar.get())
+ if (scrollbar == verticalScrollbar())
return IntSize(verticalScrollbarStart(0, box().size().width()), box().borderTop());
- if (scrollbar == m_hBar.get())
+ if (scrollbar == horizontalScrollbar())
return IntSize(horizontalScrollbarStart(0), box().size().height() - box().borderBottom() - scrollbar->height());
ASSERT_NOT_REACHED();
@@ -991,68 +997,25 @@ bool DeprecatedPaintLayerScrollableArea::needsScrollbarReconstruction() const
LayoutObject* actualLayoutObject = layoutObjectForScrollbar(box());
bool shouldUseCustom = actualLayoutObject->isBox() && actualLayoutObject->style()->hasPseudoStyle(SCROLLBAR);
bool hasAnyScrollbar = hasScrollbar();
- bool hasCustom = (m_hBar && m_hBar->isCustomScrollbar()) || (m_vBar && m_vBar->isCustomScrollbar());
+ bool hasCustom = (hasHorizontalScrollbar() && horizontalScrollbar()->isCustomScrollbar()) || (hasVerticalScrollbar() && verticalScrollbar()->isCustomScrollbar());
return hasAnyScrollbar && (shouldUseCustom != hasCustom);
}
-PassRefPtrWillBeRawPtr<Scrollbar> DeprecatedPaintLayerScrollableArea::createScrollbar(ScrollbarOrientation orientation)
-{
- RefPtrWillBeRawPtr<Scrollbar> widget = nullptr;
- LayoutObject* actualLayoutObject = layoutObjectForScrollbar(box());
- bool hasCustomScrollbarStyle = actualLayoutObject->isBox() && actualLayoutObject->style()->hasPseudoStyle(SCROLLBAR);
- if (hasCustomScrollbarStyle) {
- widget = LayoutScrollbar::createCustomScrollbar(this, orientation, actualLayoutObject->node());
- } else {
- ScrollbarControlSize scrollbarSize = RegularScrollbar;
- if (actualLayoutObject->style()->hasAppearance())
- scrollbarSize = LayoutTheme::theme().scrollbarControlSizeForPart(actualLayoutObject->style()->appearance());
- widget = Scrollbar::create(this, orientation, scrollbarSize);
- if (orientation == HorizontalScrollbar)
- didAddScrollbar(widget.get(), HorizontalScrollbar);
- else
- didAddScrollbar(widget.get(), VerticalScrollbar);
- }
- box().document().view()->addChild(widget.get());
- return widget.release();
-}
-
-void DeprecatedPaintLayerScrollableArea::destroyScrollbar(ScrollbarOrientation orientation)
-{
- RefPtrWillBeMember<Scrollbar>& scrollbar = orientation == HorizontalScrollbar ? m_hBar : m_vBar;
- if (!scrollbar)
- return;
-
- if (!scrollbar->isCustomScrollbar())
- willRemoveScrollbar(scrollbar.get(), orientation);
-
- toFrameView(scrollbar->parent())->removeChild(scrollbar.get());
- scrollbar->disconnectFromScrollableArea();
- scrollbar = nullptr;
-}
-
void DeprecatedPaintLayerScrollableArea::setHasHorizontalScrollbar(bool hasScrollbar)
{
if (hasScrollbar == hasHorizontalScrollbar())
return;
- if (hasScrollbar) {
- // This doesn't hit in any tests, but since the equivalent code in setHasVerticalScrollbar
- // does, presumably this code does as well.
- DisableCompositingQueryAsserts disabler;
- m_hBar = createScrollbar(HorizontalScrollbar);
- } else {
- if (!layerForHorizontalScrollbar())
- m_hBar->invalidate();
- // Otherwise we will remove the layer and just need recompositing.
+ if (!hasScrollbar && !layerForHorizontalScrollbar())
+ horizontalScrollbar()->invalidate();
- destroyScrollbar(HorizontalScrollbar);
- }
+ m_scrollbarManager.setHasHorizontalScrollbar(hasScrollbar);
// Destroying or creating one bar can cause our scrollbar corner to come and go. We need to update the opposite scrollbar's style.
- if (m_hBar)
- m_hBar->styleChanged();
- if (m_vBar)
- m_vBar->styleChanged();
+ if (hasHorizontalScrollbar())
+ horizontalScrollbar()->styleChanged();
+ if (hasVerticalScrollbar())
+ verticalScrollbar()->styleChanged();
// These are valid because we want to invalidate display item clients on the current backing.
DisablePaintInvalidationStateAsserts paintInvalidationAssertDisabler;
@@ -1069,23 +1032,16 @@ void DeprecatedPaintLayerScrollableArea::setHasVerticalScrollbar(bool hasScrollb
if (hasScrollbar == hasVerticalScrollbar())
return;
- if (hasScrollbar) {
- // Hits in compositing/overflow/automatically-opt-into-composited-scrolling-after-style-change.html
- DisableCompositingQueryAsserts disabler;
- m_vBar = createScrollbar(VerticalScrollbar);
- } else {
- if (!layerForVerticalScrollbar())
- m_vBar->invalidate();
- // Otherwise we will remove the layer and just need recompositing.
+ if (!hasScrollbar && !layerForVerticalScrollbar())
+ verticalScrollbar()->invalidate();
- destroyScrollbar(VerticalScrollbar);
- }
+ m_scrollbarManager.setHasVerticalScrollbar(hasScrollbar);
// Destroying or creating one bar can cause our scrollbar corner to come and go. We need to update the opposite scrollbar's style.
- if (m_hBar)
- m_hBar->styleChanged();
- if (m_vBar)
- m_vBar->styleChanged();
+ if (hasHorizontalScrollbar())
+ horizontalScrollbar()->styleChanged();
+ if (hasVerticalScrollbar())
+ verticalScrollbar()->styleChanged();
// These are valid because we want to invalidate display item clients on the current backing.
DisablePaintInvalidationStateAsserts paintInvalidationAssertDisabler;
@@ -1099,16 +1055,16 @@ void DeprecatedPaintLayerScrollableArea::setHasVerticalScrollbar(bool hasScrollb
int DeprecatedPaintLayerScrollableArea::verticalScrollbarWidth(OverlayScrollbarSizeRelevancy relevancy) const
{
- if (!m_vBar || (m_vBar->isOverlayScrollbar() && (relevancy == IgnoreOverlayScrollbarSize || !m_vBar->shouldParticipateInHitTesting())))
+ if (!hasVerticalScrollbar() || (verticalScrollbar()->isOverlayScrollbar() && (relevancy == IgnoreOverlayScrollbarSize || !verticalScrollbar()->shouldParticipateInHitTesting())))
return 0;
- return m_vBar->width();
+ return verticalScrollbar()->width();
}
int DeprecatedPaintLayerScrollableArea::horizontalScrollbarHeight(OverlayScrollbarSizeRelevancy relevancy) const
{
- if (!m_hBar || (m_hBar->isOverlayScrollbar() && (relevancy == IgnoreOverlayScrollbarSize || !m_hBar->shouldParticipateInHitTesting())))
+ if (!hasHorizontalScrollbar() || (horizontalScrollbar()->isOverlayScrollbar() && (relevancy == IgnoreOverlayScrollbarSize || !horizontalScrollbar()->shouldParticipateInHitTesting())))
return 0;
- return m_hBar->height();
+ return horizontalScrollbar()->height();
}
void DeprecatedPaintLayerScrollableArea::positionOverflowControls()
@@ -1171,25 +1127,25 @@ bool DeprecatedPaintLayerScrollableArea::hitTestOverflowControls(HitTestResult&
}
int resizeControlSize = max(resizeControlRect.height(), 0);
- if (m_vBar && m_vBar->shouldParticipateInHitTesting()) {
+ if (hasVerticalScrollbar() && verticalScrollbar()->shouldParticipateInHitTesting()) {
LayoutRect vBarRect(verticalScrollbarStart(0, box().size().width()),
box().borderTop(),
- m_vBar->width(),
- box().size().height() - (box().borderTop() + box().borderBottom()) - (m_hBar ? m_hBar->height() : resizeControlSize));
+ verticalScrollbar()->width(),
+ box().size().height() - (box().borderTop() + box().borderBottom()) - (hasHorizontalScrollbar() ? horizontalScrollbar()->height() : resizeControlSize));
if (vBarRect.contains(localPoint)) {
- result.setScrollbar(m_vBar.get());
+ result.setScrollbar(verticalScrollbar());
return true;
}
}
resizeControlSize = max(resizeControlRect.width(), 0);
- if (m_hBar && m_hBar->shouldParticipateInHitTesting()) {
+ if (hasHorizontalScrollbar() && horizontalScrollbar()->shouldParticipateInHitTesting()) {
LayoutRect hBarRect(horizontalScrollbarStart(0),
- box().size().height() - box().borderBottom() - m_hBar->height(),
- box().size().width() - (box().borderLeft() + box().borderRight()) - (m_vBar ? m_vBar->width() : resizeControlSize),
- m_hBar->height());
+ box().size().height() - box().borderBottom() - horizontalScrollbar()->height(),
+ box().size().width() - (box().borderLeft() + box().borderRight()) - (hasVerticalScrollbar() ? verticalScrollbar()->width() : resizeControlSize),
+ horizontalScrollbar()->height());
if (hBarRect.contains(localPoint)) {
- result.setScrollbar(m_hBar.get());
+ result.setScrollbar(horizontalScrollbar());
return true;
}
}
@@ -1490,4 +1446,107 @@ bool DeprecatedPaintLayerScrollableArea::visualViewportSuppliesScrollbars() cons
return frame->settings()->viewportMetaEnabled();
}
+DeprecatedPaintLayerScrollableArea::ScrollbarManager::ScrollbarManager(DeprecatedPaintLayerScrollableArea& scrollableArea)
+ : m_scrollableArea(scrollableArea)
+ , m_canDetachScrollbars(0)
+ , m_hBarIsAttached(0)
+ , m_vBarIsAttached(0)
+{
+}
+
+void DeprecatedPaintLayerScrollableArea::ScrollbarManager::dispose()
+{
+ m_canDetachScrollbars = m_hBarIsAttached = m_vBarIsAttached = 0;
+ destroyScrollbar(HorizontalScrollbar);
+ destroyScrollbar(VerticalScrollbar);
+}
+
+void DeprecatedPaintLayerScrollableArea::ScrollbarManager::setCanDetachScrollbars(bool detach)
+{
+ ASSERT(!m_hBarIsAttached || m_hBar);
+ ASSERT(!m_vBarIsAttached || m_vBar);
+ m_canDetachScrollbars = detach ? 1 : 0;
+ if (!detach) {
+ if (m_hBar && !m_hBarIsAttached)
+ destroyScrollbar(HorizontalScrollbar, true);
+ if (m_vBar && !m_vBarIsAttached)
+ destroyScrollbar(VerticalScrollbar, true);
+ }
+}
+
+void DeprecatedPaintLayerScrollableArea::ScrollbarManager::setHasHorizontalScrollbar(bool hasScrollbar)
+{
+ if (hasScrollbar) {
+ // This doesn't hit in any tests, but since the equivalent code in setHasVerticalScrollbar
+ // does, presumably this code does as well.
+ DisableCompositingQueryAsserts disabler;
+ if (!m_hBar)
+ m_hBar = createScrollbar(HorizontalScrollbar);
+ m_hBarIsAttached = 1;
+ } else {
+ m_hBarIsAttached = 0;
+ if (!m_canDetachScrollbars)
+ destroyScrollbar(HorizontalScrollbar);
+ }
+}
+
+void DeprecatedPaintLayerScrollableArea::ScrollbarManager::setHasVerticalScrollbar(bool hasScrollbar)
+{
+ if (hasScrollbar) {
+ DisableCompositingQueryAsserts disabler;
+ if (!m_vBar)
+ m_vBar = createScrollbar(VerticalScrollbar);
+ m_vBarIsAttached = 1;
+ } else {
+ m_vBarIsAttached = 0;
+ if (!m_canDetachScrollbars)
+ destroyScrollbar(VerticalScrollbar);
+ }
+}
+
+PassRefPtrWillBeRawPtr<Scrollbar> DeprecatedPaintLayerScrollableArea::ScrollbarManager::createScrollbar(ScrollbarOrientation orientation)
+{
+ ASSERT(orientation == HorizontalScrollbar ? !m_hBarIsAttached : !m_vBarIsAttached);
+ RefPtrWillBeRawPtr<Scrollbar> widget = nullptr;
+ LayoutObject* actualLayoutObject = layoutObjectForScrollbar(m_scrollableArea.box());
+ bool hasCustomScrollbarStyle = actualLayoutObject->isBox() && actualLayoutObject->style()->hasPseudoStyle(SCROLLBAR);
+ if (hasCustomScrollbarStyle) {
+ widget = LayoutScrollbar::createCustomScrollbar(&m_scrollableArea, orientation, actualLayoutObject->node());
+ } else {
+ ScrollbarControlSize scrollbarSize = RegularScrollbar;
+ if (actualLayoutObject->style()->hasAppearance())
+ scrollbarSize = LayoutTheme::theme().scrollbarControlSizeForPart(actualLayoutObject->style()->appearance());
+ widget = Scrollbar::create(&m_scrollableArea, orientation, scrollbarSize);
+ if (orientation == HorizontalScrollbar)
+ m_scrollableArea.didAddScrollbar(widget.get(), HorizontalScrollbar);
+ else
+ m_scrollableArea.didAddScrollbar(widget.get(), VerticalScrollbar);
+ }
+ m_scrollableArea.box().document().view()->addChild(widget.get());
+ return widget.release();
+}
+
+void DeprecatedPaintLayerScrollableArea::ScrollbarManager::destroyScrollbar(ScrollbarOrientation orientation, bool invalidate)
+{
+ RefPtrWillBeMember<Scrollbar>& scrollbar = orientation == HorizontalScrollbar ? m_hBar : m_vBar;
+ ASSERT(orientation == HorizontalScrollbar ? !m_hBarIsAttached: !m_vBarIsAttached);
+ if (!scrollbar)
+ return;
+
+ if (invalidate)
+ scrollbar->invalidate();
+ if (!scrollbar->isCustomScrollbar())
+ m_scrollableArea.willRemoveScrollbar(scrollbar.get(), orientation);
+
+ toFrameView(scrollbar->parent())->removeChild(scrollbar.get());
+ scrollbar->disconnectFromScrollableArea();
+ scrollbar = nullptr;
+}
+
+DEFINE_TRACE(DeprecatedPaintLayerScrollableArea::ScrollbarManager)
+{
+ visitor->trace(m_hBar);
+ visitor->trace(m_vBar);
+}
+
} // namespace blink
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