1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7 #include "HitTestInfo.h"
9 #include "mozilla/StaticPtr.h"
10 #include "mozilla/webrender/WebRenderAPI.h"
11 #include "nsDisplayList.h"
13 #include "mozilla/layers/ScrollableLayerGuid.h"
15 using namespace mozilla::gfx
;
19 static StaticAutoPtr
<const HitTestInfo
> gEmptyHitTestInfo
;
21 const HitTestInfo
& HitTestInfo::Empty() {
22 if (!gEmptyHitTestInfo
) {
23 gEmptyHitTestInfo
= new HitTestInfo();
26 return *gEmptyHitTestInfo
;
29 void HitTestInfo::Shutdown() { gEmptyHitTestInfo
= nullptr; }
31 using ViewID
= layers::ScrollableLayerGuid::ViewID
;
33 ViewID
HitTestInfo::GetViewId(wr::DisplayListBuilder
& aBuilder
,
34 const ActiveScrolledRoot
* aASR
) const {
36 return *mScrollTarget
;
39 Maybe
<ViewID
> fixedTarget
= aBuilder
.GetContainingFixedPosScrollTarget(aASR
);
46 return aASR
->GetViewId();
49 return layers::ScrollableLayerGuid::NULL_SCROLL_ID
;
52 void HitTestInfo::Initialize(nsDisplayListBuilder
* aBuilder
, nsIFrame
* aFrame
) {
53 if (!aBuilder
->BuildCompositorHitTestInfo()) {
57 mInfo
= aFrame
->GetCompositorHitTestInfo(aBuilder
);
58 if (mInfo
!= gfx::CompositorHitTestInvisibleToHit
) {
59 mArea
= aFrame
->GetCompositorHitTestArea(aBuilder
);
60 InitializeScrollTarget(aBuilder
);
64 void HitTestInfo::InitializeScrollTarget(nsDisplayListBuilder
* aBuilder
) {
65 if (aBuilder
->GetCurrentScrollbarDirection().isSome()) {
66 // In the case of scrollbar frames, we use the scrollbar's target
67 // scrollframe instead of the scrollframe with which the scrollbar actually
69 MOZ_ASSERT(Info().contains(CompositorHitTestFlags::eScrollbar
));
70 mScrollTarget
= Some(aBuilder
->GetCurrentScrollbarTarget());
74 } // namespace mozilla