зеркало из https://github.com/mozilla/gecko-dev.git
74 строки
2.1 KiB
C++
74 строки
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "HitTestInfo.h"
|
|
#include "mozilla/webrender/WebRenderAPI.h"
|
|
#include "nsDisplayList.h"
|
|
#include "nsIFrame.h"
|
|
#include "mozilla/layers/ScrollableLayerGuid.h"
|
|
|
|
namespace mozilla {
|
|
|
|
static const HitTestInfo* gEmptyHitTestInfo = nullptr;
|
|
|
|
const HitTestInfo& HitTestInfo::Empty() {
|
|
if (gEmptyHitTestInfo) {
|
|
gEmptyHitTestInfo = new HitTestInfo();
|
|
}
|
|
|
|
return *gEmptyHitTestInfo;
|
|
}
|
|
|
|
void HitTestInfo::Shutdown() {
|
|
delete gEmptyHitTestInfo;
|
|
gEmptyHitTestInfo = nullptr;
|
|
}
|
|
|
|
using ViewID = layers::ScrollableLayerGuid::ViewID;
|
|
|
|
ViewID HitTestInfo::GetViewId(wr::DisplayListBuilder& aBuilder,
|
|
const ActiveScrolledRoot* aASR) const {
|
|
if (mScrollTarget) {
|
|
return *mScrollTarget;
|
|
}
|
|
|
|
Maybe<ViewID> fixedTarget = aBuilder.GetContainingFixedPosScrollTarget(aASR);
|
|
|
|
if (fixedTarget) {
|
|
return *fixedTarget;
|
|
}
|
|
|
|
if (aASR) {
|
|
return aASR->GetViewId();
|
|
}
|
|
|
|
return layers::ScrollableLayerGuid::NULL_SCROLL_ID;
|
|
}
|
|
|
|
void HitTestInfo::Initialize(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame) {
|
|
if (!aBuilder->BuildCompositorHitTestInfo()) {
|
|
return;
|
|
}
|
|
|
|
mInfo = aFrame->GetCompositorHitTestInfo(aBuilder);
|
|
if (mInfo != gfx::CompositorHitTestInvisibleToHit) {
|
|
mArea = aFrame->GetCompositorHitTestArea(aBuilder);
|
|
InitializeScrollTarget(aBuilder);
|
|
}
|
|
}
|
|
|
|
void HitTestInfo::InitializeScrollTarget(nsDisplayListBuilder* aBuilder) {
|
|
if (aBuilder->GetCurrentScrollbarDirection().isSome()) {
|
|
// In the case of scrollbar frames, we use the scrollbar's target
|
|
// scrollframe instead of the scrollframe with which the scrollbar actually
|
|
// moves.
|
|
MOZ_ASSERT(Info().contains(CompositorHitTestFlags::eScrollbar));
|
|
mScrollTarget = Some(aBuilder->GetCurrentScrollbarTarget());
|
|
}
|
|
}
|
|
|
|
} // namespace mozilla
|