third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp - Issue 1870663002: Reland main thread position sticky implementation.

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Unified Diff: third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp

Issue 1870663002: Reland main thread position sticky implementation. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Only descend into children which have an ancestor overflow layer. Created 4 years, 8 months ago

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Index: third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp

diff --git a/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp b/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp

index 35e37d352f62e6a14573bc7edb311234b1c016d6..7e5ceb89d6cfdb1e56302f0f3b27fe566fcc0ea9 100644

--- a/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp

+++ b/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp

@@ -937,7 +937,8 @@ bool ScrollingCoordinator::hasVisibleSlowRepaintViewportConstrainedObjects(Frame

for (const LayoutObject* layoutObject : *viewportConstrainedObjects) {

ASSERT(layoutObject->isBoxModelObject() && layoutObject->hasLayer());

- ASSERT(layoutObject->style()->position() == FixedPosition);

+ ASSERT(layoutObject->style()->position() == FixedPosition

+ || layoutObject->style()->position() == StickyPosition);

PaintLayer* layer = toLayoutBoxModelObject(layoutObject)->layer();

// Whether the Layer scrolls with the viewport is a tree-depenent

@@ -986,6 +987,8 @@ MainThreadScrollingReasons ScrollingCoordinator::mainThreadScrollingReasons() co

if (frameView->hasBackgroundAttachmentFixedObjects())

reasons |= MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects;

+ if (frameView->hasStickyPositionObjects())

+ reasons |= MainThreadScrollingReason::kHasStickyPositionObjects;

FrameView::ScrollingReasons scrollingReasons = frameView->getScrollingReasons();

const bool mayBeScrolledByInput = (scrollingReasons == FrameView::Scrollable);

const bool mayBeScrolledByScript = mayBeScrolledByInput || (scrollingReasons ==

@@ -1011,6 +1014,8 @@ String ScrollingCoordinator::mainThreadScrollingReasonsAsText(MainThreadScrollin

stringBuilder.appendLiteral("Has background-attachment:fixed, ");

if (reasons & MainThreadScrollingReason::kHasNonLayerViewportConstrainedObjects)

stringBuilder.appendLiteral("Has non-layer viewport-constrained objects, ");

+ if (reasons & MainThreadScrollingReason::kHasStickyPositionObjects)

+ stringBuilder.appendLiteral("Has sticky position objects, ");

if (reasons & MainThreadScrollingReason::kThreadedScrollingDisabled)

stringBuilder.appendLiteral("Threaded scrolling is disabled, ");

if (reasons & MainThreadScrollingReason::kAnimatingScrollOnMainThread)