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

Issue 2650343008: Implement Element.scrollIntoView for scroll-behavior: smooth. (Closed)
Patch Set: Sequenced-smooth-scrolls only happen on main thread for now. Created 3 years, 6 months ago
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Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
index 4fc2ebdcb5195798ef89b8082db6c4af28770a5b..4f7b888217e07f1ff74d08bfad97d072d59746a4 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
@@ -209,6 +209,13 @@ PlatformChromeClient* PaintLayerScrollableArea::GetChromeClient() const {
return nullptr;
}
+SmoothScrollSequencer* PaintLayerScrollableArea::GetSmoothScrollSequencer()
+ const {
+ if (Page* page = Box().GetFrame()->GetPage())
+ return page->GetSmoothScrollSequencer();
+ return nullptr;
+}
+
GraphicsLayer* PaintLayerScrollableArea::LayerForScrolling() const {
return Layer()->HasCompositedLayerMapping()
? Layer()->GetCompositedLayerMapping()->ScrollingContentsLayer()
@@ -1739,6 +1746,7 @@ LayoutRect PaintLayerScrollableArea::ScrollIntoView(
const LayoutRect& rect,
const ScrollAlignment& align_x,
const ScrollAlignment& align_y,
+ bool is_smooth,
ScrollType scroll_type) {
LayoutRect local_expose_rect(
Box()
@@ -1752,8 +1760,14 @@ LayoutRect PaintLayerScrollableArea::ScrollIntoView(
ScrollOffset old_scroll_offset = GetScrollOffset();
ScrollOffset new_scroll_offset(ClampScrollOffset(RoundedIntSize(
ToScrollOffset(FloatPoint(r.Location()) + old_scroll_offset))));
- SetScrollOffset(new_scroll_offset, scroll_type, kScrollBehaviorInstant);
- ScrollOffset scroll_offset_difference = GetScrollOffset() - old_scroll_offset;
+ if (is_smooth) {
+ DCHECK(scroll_type == kProgrammaticScroll);
+ GetSmoothScrollSequencer()->QueueAnimation(this, new_scroll_offset);
+ } else {
+ SetScrollOffset(new_scroll_offset, scroll_type, kScrollBehaviorInstant);
+ }
+ ScrollOffset scroll_offset_difference =
+ ClampScrollOffset(new_scroll_offset) - old_scroll_offset;
local_expose_rect.Move(-LayoutSize(scroll_offset_difference));
LayoutRect intersect =

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