forked from mirrors/gecko-dev
499 lines
16 KiB
C++
499 lines
16 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "DOMIntersectionObserver.h"
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#include "nsCSSPropertyID.h"
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#include "nsIFrame.h"
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#include "nsContentUtils.h"
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#include "nsLayoutUtils.h"
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#include "mozilla/ServoBindings.h"
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namespace mozilla {
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namespace dom {
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMIntersectionObserverEntry)
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NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMIntersectionObserverEntry)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMIntersectionObserverEntry)
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NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(DOMIntersectionObserverEntry, mOwner,
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mRootBounds, mBoundingClientRect,
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mIntersectionRect, mTarget)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMIntersectionObserver)
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NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_ENTRY(DOMIntersectionObserver)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMIntersectionObserver)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMIntersectionObserver)
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NS_IMPL_CYCLE_COLLECTION_CLASS(DOMIntersectionObserver)
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMIntersectionObserver)
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NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMIntersectionObserver)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
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tmp->Disconnect();
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mCallback)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mRoot)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mQueuedEntries)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMIntersectionObserver)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCallback)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRoot)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mQueuedEntries)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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already_AddRefed<DOMIntersectionObserver>
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DOMIntersectionObserver::Constructor(const mozilla::dom::GlobalObject& aGlobal,
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mozilla::dom::IntersectionCallback& aCb,
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mozilla::ErrorResult& aRv)
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{
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return Constructor(aGlobal, aCb, IntersectionObserverInit(), aRv);
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}
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already_AddRefed<DOMIntersectionObserver>
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DOMIntersectionObserver::Constructor(const mozilla::dom::GlobalObject& aGlobal,
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mozilla::dom::IntersectionCallback& aCb,
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const mozilla::dom::IntersectionObserverInit& aOptions,
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mozilla::ErrorResult& aRv)
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{
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nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aGlobal.GetAsSupports());
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if (!window) {
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aRv.Throw(NS_ERROR_FAILURE);
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return nullptr;
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}
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RefPtr<DOMIntersectionObserver> observer =
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new DOMIntersectionObserver(window.forget(), aCb);
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observer->mRoot = aOptions.mRoot;
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if (!observer->SetRootMargin(aOptions.mRootMargin)) {
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aRv.ThrowDOMException(NS_ERROR_DOM_SYNTAX_ERR,
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NS_LITERAL_CSTRING("rootMargin must be specified in pixels or percent."));
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return nullptr;
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}
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if (aOptions.mThreshold.IsDoubleSequence()) {
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const mozilla::dom::Sequence<double>& thresholds = aOptions.mThreshold.GetAsDoubleSequence();
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observer->mThresholds.SetCapacity(thresholds.Length());
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for (const auto& thresh : thresholds) {
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if (thresh < 0.0 || thresh > 1.0) {
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aRv.ThrowTypeError<dom::MSG_THRESHOLD_RANGE_ERROR>();
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return nullptr;
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}
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observer->mThresholds.AppendElement(thresh);
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}
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observer->mThresholds.Sort();
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} else {
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double thresh = aOptions.mThreshold.GetAsDouble();
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if (thresh < 0.0 || thresh > 1.0) {
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aRv.ThrowTypeError<dom::MSG_THRESHOLD_RANGE_ERROR>();
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return nullptr;
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}
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observer->mThresholds.AppendElement(thresh);
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}
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return observer.forget();
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}
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bool
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DOMIntersectionObserver::SetRootMargin(const nsAString& aString)
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{
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return Servo_IntersectionObserverRootMargin_Parse(&aString, &mRootMargin);
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}
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void
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DOMIntersectionObserver::GetRootMargin(mozilla::dom::DOMString& aRetVal)
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{
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nsString& retVal = aRetVal;
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Servo_IntersectionObserverRootMargin_ToString(&mRootMargin, &retVal);
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}
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void
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DOMIntersectionObserver::GetThresholds(nsTArray<double>& aRetVal)
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{
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aRetVal = mThresholds;
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}
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void
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DOMIntersectionObserver::Observe(Element& aTarget)
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{
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if (mObservationTargets.Contains(&aTarget)) {
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return;
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}
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aTarget.RegisterIntersectionObserver(this);
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mObservationTargets.AppendElement(&aTarget);
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Connect();
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}
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void
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DOMIntersectionObserver::Unobserve(Element& aTarget)
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{
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if (!mObservationTargets.Contains(&aTarget)) {
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return;
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}
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if (mObservationTargets.Length() == 1) {
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Disconnect();
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return;
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}
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mObservationTargets.RemoveElement(&aTarget);
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aTarget.UnregisterIntersectionObserver(this);
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}
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void
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DOMIntersectionObserver::UnlinkTarget(Element& aTarget)
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{
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mObservationTargets.RemoveElement(&aTarget);
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if (mObservationTargets.Length() == 0) {
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Disconnect();
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}
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}
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void
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DOMIntersectionObserver::Connect()
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{
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if (mConnected) {
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return;
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}
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mConnected = true;
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if (mDocument) {
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mDocument->AddIntersectionObserver(this);
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}
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}
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void
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DOMIntersectionObserver::Disconnect()
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{
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if (!mConnected) {
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return;
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}
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mConnected = false;
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for (size_t i = 0; i < mObservationTargets.Length(); ++i) {
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Element* target = mObservationTargets.ElementAt(i);
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target->UnregisterIntersectionObserver(this);
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}
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mObservationTargets.Clear();
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if (mDocument) {
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mDocument->RemoveIntersectionObserver(this);
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}
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}
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void
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DOMIntersectionObserver::TakeRecords(nsTArray<RefPtr<DOMIntersectionObserverEntry>>& aRetVal)
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{
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aRetVal.SwapElements(mQueuedEntries);
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mQueuedEntries.Clear();
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}
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static bool
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CheckSimilarOrigin(nsINode* aNode1, nsINode* aNode2)
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{
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nsIPrincipal* principal1 = aNode1->NodePrincipal();
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nsIPrincipal* principal2 = aNode2->NodePrincipal();
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nsAutoCString baseDomain1;
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nsAutoCString baseDomain2;
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nsresult rv = principal1->GetBaseDomain(baseDomain1);
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if (NS_FAILED(rv)) {
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return principal1 == principal2;
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}
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rv = principal2->GetBaseDomain(baseDomain2);
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if (NS_FAILED(rv)) {
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return principal1 == principal2;
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}
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return baseDomain1 == baseDomain2;
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}
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static Maybe<nsRect>
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EdgeInclusiveIntersection(const nsRect& aRect, const nsRect& aOtherRect)
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{
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nscoord left = std::max(aRect.x, aOtherRect.x);
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nscoord top = std::max(aRect.y, aOtherRect.y);
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nscoord right = std::min(aRect.XMost(), aOtherRect.XMost());
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nscoord bottom = std::min(aRect.YMost(), aOtherRect.YMost());
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if (left > right || top > bottom) {
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return Nothing();
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}
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return Some(nsRect(left, top, right - left, bottom - top));
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}
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enum class BrowsingContextInfo {
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SimilarOriginBrowsingContext,
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DifferentOriginBrowsingContext,
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UnknownBrowsingContext
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};
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void
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DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time)
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{
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Element* root = nullptr;
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nsIFrame* rootFrame = nullptr;
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nsRect rootRect;
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if (mRoot) {
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root = mRoot;
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rootFrame = root->GetPrimaryFrame();
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if (rootFrame) {
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nsRect rootRectRelativeToRootFrame;
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if (rootFrame->IsScrollFrame()) {
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// rootRectRelativeToRootFrame should be the content rect of rootFrame, not including the scrollbars.
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nsIScrollableFrame* scrollFrame = do_QueryFrame(rootFrame);
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rootRectRelativeToRootFrame = scrollFrame->GetScrollPortRect();
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} else {
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// rootRectRelativeToRootFrame should be the border rect of rootFrame.
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rootRectRelativeToRootFrame = rootFrame->GetRectRelativeToSelf();
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}
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nsIFrame* containingBlock =
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nsLayoutUtils::GetContainingBlockForClientRect(rootFrame);
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rootRect =
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nsLayoutUtils::TransformFrameRectToAncestor(rootFrame,
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rootRectRelativeToRootFrame,
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containingBlock);
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}
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} else {
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nsCOMPtr<nsIPresShell> presShell = aDocument->GetShell();
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if (presShell) {
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rootFrame = presShell->GetRootScrollFrame();
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if (rootFrame) {
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nsPresContext* presContext = rootFrame->PresContext();
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while (!presContext->IsRootContentDocument()) {
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presContext = presContext->GetParentPresContext();
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if (!presContext) {
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break;
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}
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nsIFrame* rootScrollFrame = presContext->PresShell()->GetRootScrollFrame();
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if (rootScrollFrame) {
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rootFrame = rootScrollFrame;
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} else {
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break;
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}
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}
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root = rootFrame->GetContent()->AsElement();
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nsIScrollableFrame* scrollFrame = do_QueryFrame(rootFrame);
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// If we end up with a null root frame for some reason, we'll proceed
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// with an empty root intersection rect.
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if (scrollFrame) {
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rootRect = scrollFrame->GetScrollPortRect();
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}
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}
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}
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}
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nsMargin rootMargin;
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NS_FOR_CSS_SIDES(side) {
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nscoord basis = side == eSideTop || side == eSideBottom ?
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rootRect.Height() : rootRect.Width();
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nsStyleCoord coord = mRootMargin.Get(side);
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rootMargin.Side(side) = nsLayoutUtils::ComputeCBDependentValue(basis, coord);
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}
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for (size_t i = 0; i < mObservationTargets.Length(); ++i) {
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Element* target = mObservationTargets.ElementAt(i);
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nsIFrame* targetFrame = target->GetPrimaryFrame();
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nsRect targetRect;
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Maybe<nsRect> intersectionRect;
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bool isSameDoc = root && root->GetComposedDoc() == target->GetComposedDoc();
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if (rootFrame && targetFrame) {
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// If mRoot is set we are testing intersection with a container element
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// instead of the implicit root.
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if (mRoot) {
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// Skip further processing of this target if it is not in the same
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// Document as the intersection root, e.g. if root is an element of
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// the main document and target an element from an embedded iframe.
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if (!isSameDoc) {
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continue;
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}
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// Skip further processing of this target if is not a descendant of the
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// intersection root in the containing block chain. E.g. this would be
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// the case if the target is in a position:absolute element whose
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// containing block is an ancestor of root.
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if (!nsLayoutUtils::IsAncestorFrameCrossDoc(rootFrame, targetFrame)) {
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continue;
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}
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}
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targetRect = nsLayoutUtils::GetAllInFlowRectsUnion(
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targetFrame,
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nsLayoutUtils::GetContainingBlockForClientRect(targetFrame),
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nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS
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);
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intersectionRect = Some(targetFrame->GetRectRelativeToSelf());
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nsIFrame* containerFrame = nsLayoutUtils::GetCrossDocParentFrame(targetFrame);
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while (containerFrame && containerFrame != rootFrame) {
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if (containerFrame->IsScrollFrame()) {
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nsIScrollableFrame* scrollFrame = do_QueryFrame(containerFrame);
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nsRect subFrameRect = scrollFrame->GetScrollPortRect();
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nsRect intersectionRectRelativeToContainer =
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nsLayoutUtils::TransformFrameRectToAncestor(targetFrame,
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intersectionRect.value(),
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containerFrame);
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intersectionRect = EdgeInclusiveIntersection(intersectionRectRelativeToContainer,
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subFrameRect);
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if (!intersectionRect) {
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break;
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}
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targetFrame = containerFrame;
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}
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// TODO: Apply clip-path.
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containerFrame = nsLayoutUtils::GetCrossDocParentFrame(containerFrame);
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}
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}
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nsRect rootIntersectionRect;
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BrowsingContextInfo isInSimilarOriginBrowsingContext =
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BrowsingContextInfo::UnknownBrowsingContext;
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if (rootFrame && targetFrame) {
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rootIntersectionRect = rootRect;
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}
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if (root && target) {
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isInSimilarOriginBrowsingContext = CheckSimilarOrigin(root, target) ?
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BrowsingContextInfo::SimilarOriginBrowsingContext :
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BrowsingContextInfo::DifferentOriginBrowsingContext;
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}
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if (isInSimilarOriginBrowsingContext ==
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BrowsingContextInfo::SimilarOriginBrowsingContext) {
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rootIntersectionRect.Inflate(rootMargin);
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}
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if (intersectionRect.isSome()) {
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nsRect intersectionRectRelativeToRoot =
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nsLayoutUtils::TransformFrameRectToAncestor(
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targetFrame,
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intersectionRect.value(),
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nsLayoutUtils::GetContainingBlockForClientRect(rootFrame)
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);
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intersectionRect = EdgeInclusiveIntersection(
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intersectionRectRelativeToRoot,
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rootIntersectionRect
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);
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if (intersectionRect.isSome() && !isSameDoc) {
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nsRect rect = intersectionRect.value();
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nsPresContext* presContext = targetFrame->PresContext();
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nsIFrame* rootScrollFrame = presContext->PresShell()->GetRootScrollFrame();
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if (rootScrollFrame) {
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nsLayoutUtils::TransformRect(rootFrame, rootScrollFrame, rect);
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}
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intersectionRect = Some(rect);
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}
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}
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int64_t targetArea =
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(int64_t) targetRect.Width() * (int64_t) targetRect.Height();
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int64_t intersectionArea = !intersectionRect ? 0 :
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(int64_t) intersectionRect->Width() *
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(int64_t) intersectionRect->Height();
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double intersectionRatio;
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if (targetArea > 0.0) {
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intersectionRatio =
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std::min((double) intersectionArea / (double) targetArea, 1.0);
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} else {
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intersectionRatio = intersectionRect.isSome() ? 1.0 : 0.0;
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}
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int32_t threshold = -1;
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if (intersectionRect.isSome()) {
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// Spec: "Let thresholdIndex be the index of the first entry in
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// observer.thresholds whose value is greater than intersectionRatio."
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threshold = mThresholds.IndexOfFirstElementGt(intersectionRatio);
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if (threshold == 0) {
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// Per the spec, we should leave threshold at 0 and distinguish between
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// "less than all thresholds and intersecting" and "not intersecting"
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// (queuing observer entries as both cases come to pass). However,
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// neither Chrome nor the WPT tests expect this behavior, so treat these
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// two cases as one.
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threshold = -1;
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}
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}
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if (target->UpdateIntersectionObservation(this, threshold)) {
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QueueIntersectionObserverEntry(
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target, time,
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isInSimilarOriginBrowsingContext ==
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BrowsingContextInfo::DifferentOriginBrowsingContext ?
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Nothing() : Some(rootIntersectionRect),
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targetRect, intersectionRect, intersectionRatio
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);
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}
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}
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}
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void
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DOMIntersectionObserver::QueueIntersectionObserverEntry(Element* aTarget,
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DOMHighResTimeStamp time,
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const Maybe<nsRect>& aRootRect,
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const nsRect& aTargetRect,
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const Maybe<nsRect>& aIntersectionRect,
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double aIntersectionRatio)
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{
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RefPtr<DOMRect> rootBounds;
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if (aRootRect.isSome()) {
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rootBounds = new DOMRect(this);
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rootBounds->SetLayoutRect(aRootRect.value());
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}
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RefPtr<DOMRect> boundingClientRect = new DOMRect(this);
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boundingClientRect->SetLayoutRect(aTargetRect);
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RefPtr<DOMRect> intersectionRect = new DOMRect(this);
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if (aIntersectionRect.isSome()) {
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intersectionRect->SetLayoutRect(aIntersectionRect.value());
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}
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RefPtr<DOMIntersectionObserverEntry> entry = new DOMIntersectionObserverEntry(
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this,
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time,
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rootBounds.forget(),
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boundingClientRect.forget(),
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intersectionRect.forget(),
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aIntersectionRect.isSome(),
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aTarget, aIntersectionRatio);
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mQueuedEntries.AppendElement(entry.forget());
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}
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void
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DOMIntersectionObserver::Notify()
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{
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if (!mQueuedEntries.Length()) {
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return;
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}
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mozilla::dom::Sequence<mozilla::OwningNonNull<DOMIntersectionObserverEntry>> entries;
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if (entries.SetCapacity(mQueuedEntries.Length(), mozilla::fallible)) {
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for (size_t i = 0; i < mQueuedEntries.Length(); ++i) {
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RefPtr<DOMIntersectionObserverEntry> next = mQueuedEntries[i];
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*entries.AppendElement(mozilla::fallible) = next;
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}
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}
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mQueuedEntries.Clear();
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mCallback->Call(this, entries, *this);
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}
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} // namespace dom
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} // namespace mozilla
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