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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /gfx/layers/apz/src/OverscrollHandoffState.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'gfx/layers/apz/src/OverscrollHandoffState.cpp')
-rw-r--r--gfx/layers/apz/src/OverscrollHandoffState.cpp175
1 files changed, 175 insertions, 0 deletions
diff --git a/gfx/layers/apz/src/OverscrollHandoffState.cpp b/gfx/layers/apz/src/OverscrollHandoffState.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et 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 "OverscrollHandoffState.h"
+
+#include <algorithm> // for std::stable_sort
+#include "mozilla/Assertions.h"
+#include "AsyncPanZoomController.h"
+
+namespace mozilla {
+namespace layers {
+
+OverscrollHandoffChain::~OverscrollHandoffChain() {}
+
+void
+OverscrollHandoffChain::Add(AsyncPanZoomController* aApzc)
+{
+ mChain.push_back(aApzc);
+}
+
+struct CompareByScrollPriority
+{
+ bool operator()(const RefPtr<AsyncPanZoomController>& a,
+ const RefPtr<AsyncPanZoomController>& b) const
+ {
+ return a->HasScrollgrab() && !b->HasScrollgrab();
+ }
+};
+
+void
+OverscrollHandoffChain::SortByScrollPriority()
+{
+ // The sorting being stable ensures that the relative order between
+ // non-scrollgrabbing APZCs remains child -> parent.
+ // (The relative order between scrollgrabbing APZCs will also remain
+ // child -> parent, though that's just an artefact of the implementation
+ // and users of 'scrollgrab' should not rely on this.)
+ std::stable_sort(mChain.begin(), mChain.end(), CompareByScrollPriority());
+}
+
+const RefPtr<AsyncPanZoomController>&
+OverscrollHandoffChain::GetApzcAtIndex(uint32_t aIndex) const
+{
+ MOZ_ASSERT(aIndex < Length());
+ return mChain[aIndex];
+}
+
+uint32_t
+OverscrollHandoffChain::IndexOf(const AsyncPanZoomController* aApzc) const
+{
+ uint32_t i;
+ for (i = 0; i < Length(); ++i) {
+ if (mChain[i] == aApzc) {
+ break;
+ }
+ }
+ return i;
+}
+
+void
+OverscrollHandoffChain::ForEachApzc(APZCMethod aMethod) const
+{
+ for (uint32_t i = 0; i < Length(); ++i) {
+ (mChain[i]->*aMethod)();
+ }
+}
+
+bool
+OverscrollHandoffChain::AnyApzc(APZCPredicate aPredicate) const
+{
+ MOZ_ASSERT(Length() > 0);
+ for (uint32_t i = 0; i < Length(); ++i) {
+ if ((mChain[i]->*aPredicate)()) {
+ return true;
+ }
+ }
+ return false;
+}
+
+void
+OverscrollHandoffChain::FlushRepaints() const
+{
+ ForEachApzc(&AsyncPanZoomController::FlushRepaintForOverscrollHandoff);
+}
+
+void
+OverscrollHandoffChain::CancelAnimations(CancelAnimationFlags aFlags) const
+{
+ MOZ_ASSERT(Length() > 0);
+ for (uint32_t i = 0; i < Length(); ++i) {
+ mChain[i]->CancelAnimation(aFlags);
+ }
+}
+
+void
+OverscrollHandoffChain::ClearOverscroll() const
+{
+ ForEachApzc(&AsyncPanZoomController::ClearOverscroll);
+}
+
+void
+OverscrollHandoffChain::SnapBackOverscrolledApzc(const AsyncPanZoomController* aStart) const
+{
+ uint32_t i = IndexOf(aStart);
+ for (; i < Length(); ++i) {
+ AsyncPanZoomController* apzc = mChain[i];
+ if (!apzc->IsDestroyed()) {
+ apzc->SnapBackIfOverscrolled();
+ }
+ }
+}
+
+bool
+OverscrollHandoffChain::CanBePanned(const AsyncPanZoomController* aApzc) const
+{
+ // Find |aApzc| in the handoff chain.
+ uint32_t i = IndexOf(aApzc);
+
+ // See whether any APZC in the handoff chain starting from |aApzc|
+ // has room to be panned.
+ for (uint32_t j = i; j < Length(); ++j) {
+ if (mChain[j]->IsPannable()) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+bool
+OverscrollHandoffChain::CanScrollInDirection(const AsyncPanZoomController* aApzc,
+ Layer::ScrollDirection aDirection) const
+{
+ // Find |aApzc| in the handoff chain.
+ uint32_t i = IndexOf(aApzc);
+
+ // See whether any APZC in the handoff chain starting from |aApzc|
+ // has room to scroll in the given direction.
+ for (uint32_t j = i; j < Length(); ++j) {
+ if (mChain[j]->CanScroll(aDirection)) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+bool
+OverscrollHandoffChain::HasOverscrolledApzc() const
+{
+ return AnyApzc(&AsyncPanZoomController::IsOverscrolled);
+}
+
+bool
+OverscrollHandoffChain::HasFastFlungApzc() const
+{
+ return AnyApzc(&AsyncPanZoomController::IsFlingingFast);
+}
+
+RefPtr<AsyncPanZoomController>
+OverscrollHandoffChain::FindFirstScrollable(const InputData& aInput) const
+{
+ for (size_t i = 0; i < Length(); i++) {
+ if (mChain[i]->CanScroll(aInput)) {
+ return mChain[i];
+ }
+ }
+ return nullptr;
+}
+
+} // namespace layers
+} // namespace mozilla