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Bug 1127773 - Use the entire scrollable overflow rect so that scrolledframes build event regions more correctly. r=tn

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(Patch dictated by roc)
This commit is contained in:
Kartikaya Gupta 2015-02-05 08:25:49 -05:00
parent 5e878ba66f
commit 6bcbfc5468
1 changed files with 14 additions and 1 deletions
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15
layout/base/nsDisplayList.cpp
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@ -3126,9 +3126,22 @@ nsDisplayLayerEventRegions::AddFrame(nsDisplayListBuilder* aBuilder,
return;
}
// XXX handle other pointerEvents values for SVG
// XXX Do something clever here for the common case where the border box
// is obviously entirely inside mHitRegion.
nsRect borderBox(aBuilder->ToReferenceFrame(aFrame), aFrame->GetSize());
nsRect borderBox;
if (nsLayoutUtils::GetScrollableFrameFor(aFrame)) {
// If the frame is content of a scrollframe, then we need to pick up the
// area corresponding to the overflow rect as well. Otherwise the parts of
// the overflow that are not occupied by descendants get skipped and the
// APZ code sends touch events to the content underneath instead.
// See https://bugzilla.mozilla.org/show_bug.cgi?id=1127773#c15.
borderBox = aFrame->GetScrollableOverflowRect();
} else {
borderBox = nsRect(nsPoint(0, 0), aFrame->GetSize());
}
borderBox += aBuilder->ToReferenceFrame(aFrame);
const DisplayItemClip* clip = aBuilder->ClipState().GetCurrentCombinedClip(aBuilder);
bool borderBoxHasRoundedCorners =
nsLayoutUtils::HasNonZeroCorner(aFrame->StyleBorder()->mBorderRadius);