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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
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