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/* -*- 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,
#include "ScrollTimeline.h"
#include "mozilla/dom/Animation.h"
#include "mozilla/dom/ElementInlines.h"
#include "mozilla/AnimationTarget.h"
#include "mozilla/DisplayPortUtils.h"
#include "mozilla/ElementAnimationData.h"
#include "mozilla/PresShell.h"
#include "nsIFrame.h"
#include "nsIScrollableFrame.h"
#include "nsLayoutUtils.h"
namespace mozilla::dom {
// ---------------------------------
// Methods of ScrollTimeline
// ---------------------------------
NS_IMPL_CYCLE_COLLECTION_CLASS(ScrollTimeline)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(ScrollTimeline,
AnimationTimeline)
tmp->Teardown();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mSource.mElement)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ScrollTimeline,
AnimationTimeline)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSource.mElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(ScrollTimeline,
AnimationTimeline)
ScrollTimeline::ScrollTimeline(Document* aDocument, const Scroller& aScroller,
StyleScrollAxis aAxis)
: AnimationTimeline(aDocument->GetParentObject(),
aDocument->GetScopeObject()->GetRTPCallerType()),
mDocument(aDocument),
mSource(aScroller),
mAxis(aAxis) {
MOZ_ASSERT(aDocument);
RegisterWithScrollSource();
}
/* static */ std::pair<const Element*, PseudoStyleType>
ScrollTimeline::FindNearestScroller(Element* aSubject,
PseudoStyleType aPseudoType) {
MOZ_ASSERT(aSubject);
Element* subject =
AnimationUtils::GetElementForRestyle(aSubject, aPseudoType);
Element* curr = subject->GetFlattenedTreeParentElement();
Element* root = subject->OwnerDoc()->GetDocumentElement();
while (curr && curr != root) {
const ComputedStyle* style = Servo_Element_GetMaybeOutOfDateStyle(curr);
MOZ_ASSERT(style, "The ancestor should be styled.");
if (style->StyleDisplay()->IsScrollableOverflow()) {
break;
}
curr = curr->GetFlattenedTreeParentElement();
}
// If there is no scroll container, we use root.
if (!curr) {
return {root, PseudoStyleType::NotPseudo};
}
return AnimationUtils::GetElementPseudoPair(curr);
}
/* static */
already_AddRefed<ScrollTimeline> ScrollTimeline::MakeAnonymous(
Document* aDocument, const NonOwningAnimationTarget& aTarget,
StyleScrollAxis aAxis, StyleScroller aScroller) {
MOZ_ASSERT(aTarget);
Scroller scroller;
switch (aScroller) {
case StyleScroller::Root:
scroller = Scroller::Root(aTarget.mElement->OwnerDoc());
break;
case StyleScroller::Nearest: {
auto [element, pseudo] =
FindNearestScroller(aTarget.mElement, aTarget.mPseudoType);
scroller = Scroller::Nearest(const_cast<Element*>(element), pseudo);
break;
}
case StyleScroller::SelfElement:
scroller = Scroller::Self(aTarget.mElement, aTarget.mPseudoType);
break;
}
// Each use of scroll() corresponds to its own instance of ScrollTimeline in
// the Web Animations API, even if multiple elements use scroll() to refer to
// the same scroll container with the same arguments.
return MakeAndAddRef<ScrollTimeline>(aDocument, scroller, aAxis);
}
/* static*/ already_AddRefed<ScrollTimeline> ScrollTimeline::MakeNamed(
Document* aDocument, Element* aReferenceElement,
PseudoStyleType aPseudoType, const StyleScrollTimeline& aStyleTimeline) {
MOZ_ASSERT(NS_IsMainThread());
Scroller scroller = Scroller::Named(aReferenceElement, aPseudoType);
return MakeAndAddRef<ScrollTimeline>(aDocument, std::move(scroller),
aStyleTimeline.GetAxis());
}
Nullable<TimeDuration> ScrollTimeline::GetCurrentTimeAsDuration() const {
// If no layout box, this timeline is inactive.
if (!mSource || !mSource.mElement->GetPrimaryFrame()) {
return nullptr;
}
// if this is not a scroller container, this timeline is inactive.
const nsIScrollableFrame* scrollFrame = GetScrollFrame();
if (!scrollFrame) {
return nullptr;
}
const auto orientation = Axis();
// If there is no scrollable overflow, then the ScrollTimeline is inactive.
if (!scrollFrame->GetAvailableScrollingDirections().contains(orientation)) {
return nullptr;
}
const bool isHorizontal = orientation == layers::ScrollDirection::eHorizontal;
const nsPoint& scrollPosition = scrollFrame->GetScrollPosition();
const Maybe<ScrollOffsets>& offsets =
ComputeOffsets(scrollFrame, orientation);
if (!offsets) {
return nullptr;
}
// Note: For RTL, scrollPosition.x or scrollPosition.y may be negative,
// e.g. the range of its value is [0, -range], so we have to use the
// absolute value.
nscoord position =
std::abs(isHorizontal ? scrollPosition.x : scrollPosition.y);
double progress = static_cast<double>(position - offsets->mStart) /
static_cast<double>(offsets->mEnd - offsets->mStart);
return TimeDuration::FromMilliseconds(progress *
PROGRESS_TIMELINE_DURATION_MILLISEC);
}
layers::ScrollDirection ScrollTimeline::Axis() const {
MOZ_ASSERT(mSource && mSource.mElement->GetPrimaryFrame());
const WritingMode wm = mSource.mElement->GetPrimaryFrame()->GetWritingMode();
return mAxis == StyleScrollAxis::Horizontal ||
(!wm.IsVertical() && mAxis == StyleScrollAxis::Inline) ||
(wm.IsVertical() && mAxis == StyleScrollAxis::Block)
? layers::ScrollDirection::eHorizontal
: layers::ScrollDirection::eVertical;
}
StyleOverflow ScrollTimeline::SourceScrollStyle() const {
MOZ_ASSERT(mSource && mSource.mElement->GetPrimaryFrame());
const nsIScrollableFrame* scrollFrame = GetScrollFrame();
MOZ_ASSERT(scrollFrame);
const ScrollStyles scrollStyles = scrollFrame->GetScrollStyles();
return Axis() == layers::ScrollDirection::eHorizontal
? scrollStyles.mHorizontal
: scrollStyles.mVertical;
}
bool ScrollTimeline::APZIsActiveForSource() const {
MOZ_ASSERT(mSource);
return gfxPlatform::AsyncPanZoomEnabled() &&
!nsLayoutUtils::ShouldDisableApzForElement(mSource.mElement) &&
DisplayPortUtils::HasNonMinimalNonZeroDisplayPort(mSource.mElement);
}
bool ScrollTimeline::ScrollingDirectionIsAvailable() const {
const nsIScrollableFrame* scrollFrame = GetScrollFrame();
MOZ_ASSERT(scrollFrame);
return scrollFrame->GetAvailableScrollingDirections().contains(Axis());
}
void ScrollTimeline::ReplacePropertiesWith(const Element* aReferenceElement,
PseudoStyleType aPseudoType,
const StyleScrollTimeline& aNew) {
MOZ_ASSERT(aReferenceElement == mSource.mElement &&
aPseudoType == mSource.mPseudoType);
mAxis = aNew.GetAxis();
for (auto* anim = mAnimationOrder.getFirst(); anim;
anim = static_cast<LinkedListElement<Animation>*>(anim)->getNext()) {
MOZ_ASSERT(anim->GetTimeline() == this);
// Set this so we just PostUpdate() for this animation.
anim->SetTimeline(this);
}
}
Maybe<ScrollTimeline::ScrollOffsets> ScrollTimeline::ComputeOffsets(
const nsIScrollableFrame* aScrollFrame,
layers::ScrollDirection aOrientation) const {
const nsRect& scrollRange = aScrollFrame->GetScrollRange();
nscoord range = aOrientation == layers::ScrollDirection::eHorizontal
? scrollRange.width
: scrollRange.height;
MOZ_ASSERT(range > 0);
return Some(ScrollOffsets{0, range});
}
void ScrollTimeline::RegisterWithScrollSource() {
if (!mSource) {
return;
}
auto& scheduler =
ProgressTimelineScheduler::Ensure(mSource.mElement, mSource.mPseudoType);
scheduler.AddTimeline(this);
}
void ScrollTimeline::UnregisterFromScrollSource() {
if (!mSource) {
return;
}
auto* scheduler =
ProgressTimelineScheduler::Get(mSource.mElement, mSource.mPseudoType);
if (!scheduler) {
return;
}
scheduler->RemoveTimeline(this);
if (scheduler->IsEmpty()) {
ProgressTimelineScheduler::Destroy(mSource.mElement, mSource.mPseudoType);
}
}
const nsIScrollableFrame* ScrollTimeline::GetScrollFrame() const {
if (!mSource) {
return nullptr;
}
switch (mSource.mType) {
case Scroller::Type::Root:
if (const PresShell* presShell =
mSource.mElement->OwnerDoc()->GetPresShell()) {
return presShell->GetRootScrollFrameAsScrollable();
}
return nullptr;
case Scroller::Type::Nearest:
case Scroller::Type::Name:
case Scroller::Type::Self:
return nsLayoutUtils::FindScrollableFrameFor(mSource.mElement);
}
MOZ_ASSERT_UNREACHABLE("Unsupported scroller type");
return nullptr;
}
void ScrollTimeline::NotifyAnimationContentVisibilityChanged(
Animation* aAnimation, bool aIsVisible) {
AnimationTimeline::NotifyAnimationContentVisibilityChanged(aAnimation,
aIsVisible);
if (mAnimationOrder.isEmpty()) {
UnregisterFromScrollSource();
} else {
RegisterWithScrollSource();
}
}
// ------------------------------------
// Methods of ProgressTimelineScheduler
// ------------------------------------
/* static */ ProgressTimelineScheduler* ProgressTimelineScheduler::Get(
const Element* aElement, PseudoStyleType aPseudoType) {
MOZ_ASSERT(aElement);
auto* data = aElement->GetAnimationData();
if (!data) {
return nullptr;
}
return data->GetProgressTimelineScheduler(aPseudoType);
}
/* static */ ProgressTimelineScheduler& ProgressTimelineScheduler::Ensure(
Element* aElement, PseudoStyleType aPseudoType) {
MOZ_ASSERT(aElement);
return aElement->EnsureAnimationData().EnsureProgressTimelineScheduler(
*aElement, aPseudoType);
}
/* static */
void ProgressTimelineScheduler::Destroy(const Element* aElement,
PseudoStyleType aPseudoType) {
auto* data = aElement->GetAnimationData();
MOZ_ASSERT(data);
data->ClearProgressTimelineScheduler(aPseudoType);
}
} // namespace mozilla::dom