summaryrefslogtreecommitdiffstats
path: root/layout/painting/HitTestInfo.cpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--layout/painting/HitTestInfo.cpp74
1 files changed, 74 insertions, 0 deletions
diff --git a/layout/painting/HitTestInfo.cpp b/layout/painting/HitTestInfo.cpp
new file mode 100644
index 0000000000..872773c32f
--- /dev/null
+++ b/layout/painting/HitTestInfo.cpp
@@ -0,0 +1,74 @@
+/* -*- 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/StaticPtr.h"
+#include "mozilla/webrender/WebRenderAPI.h"
+#include "nsDisplayList.h"
+#include "nsIFrame.h"
+#include "mozilla/layers/ScrollableLayerGuid.h"
+
+using namespace mozilla::gfx;
+
+namespace mozilla {
+
+static StaticAutoPtr<const HitTestInfo> gEmptyHitTestInfo;
+
+const HitTestInfo& HitTestInfo::Empty() {
+ if (!gEmptyHitTestInfo) {
+ gEmptyHitTestInfo = new HitTestInfo();
+ }
+
+ return *gEmptyHitTestInfo;
+}
+
+void HitTestInfo::Shutdown() { 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