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