зеркало из https://github.com/mozilla/gecko-dev.git
436 строки
12 KiB
C++
436 строки
12 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/EventListenerManager.h"
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#include "mozilla/dom/Event.h"
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#include "mozilla/dom/SVGAnimationElement.h"
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#include "mozilla/dom/TimeEvent.h"
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#include "nsSMILTimeValueSpec.h"
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#include "nsSMILInterval.h"
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#include "nsSMILTimeContainer.h"
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#include "nsSMILTimeValue.h"
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#include "nsSMILTimedElement.h"
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#include "nsSMILInstanceTime.h"
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#include "nsSMILParserUtils.h"
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#include "nsString.h"
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#include <limits>
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using namespace mozilla;
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using namespace mozilla::dom;
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//----------------------------------------------------------------------
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// Nested class: EventListener
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NS_IMPL_ISUPPORTS(nsSMILTimeValueSpec::EventListener, nsIDOMEventListener)
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NS_IMETHODIMP
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nsSMILTimeValueSpec::EventListener::HandleEvent(Event* aEvent)
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{
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if (mSpec) {
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mSpec->HandleEvent(aEvent);
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}
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return NS_OK;
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}
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//----------------------------------------------------------------------
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// Implementation
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nsSMILTimeValueSpec::nsSMILTimeValueSpec(nsSMILTimedElement& aOwner,
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bool aIsBegin)
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: mOwner(&aOwner),
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mIsBegin(aIsBegin),
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mReferencedElement(this)
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{
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}
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nsSMILTimeValueSpec::~nsSMILTimeValueSpec()
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{
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UnregisterFromReferencedElement(mReferencedElement.get());
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if (mEventListener) {
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mEventListener->Disconnect();
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mEventListener = nullptr;
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}
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}
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nsresult
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nsSMILTimeValueSpec::SetSpec(const nsAString& aStringSpec,
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Element* aContextNode)
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{
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nsSMILTimeValueSpecParams params;
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if (!nsSMILParserUtils::ParseTimeValueSpecParams(aStringSpec, params))
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return NS_ERROR_FAILURE;
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mParams = params;
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// According to SMIL 3.0:
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// The special value "indefinite" does not yield an instance time in the
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// begin list. It will, however yield a single instance with the value
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// "indefinite" in an end list. This value is not removed by a reset.
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if (mParams.mType == nsSMILTimeValueSpecParams::OFFSET ||
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(!mIsBegin && mParams.mType == nsSMILTimeValueSpecParams::INDEFINITE)) {
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mOwner->AddInstanceTime(new nsSMILInstanceTime(mParams.mOffset), mIsBegin);
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}
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// Fill in the event symbol to simplify handling later
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if (mParams.mType == nsSMILTimeValueSpecParams::REPEAT) {
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mParams.mEventSymbol = nsGkAtoms::repeatEvent;
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}
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ResolveReferences(aContextNode);
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return NS_OK;
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}
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void
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nsSMILTimeValueSpec::ResolveReferences(nsIContent* aContextNode)
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{
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if (mParams.mType != nsSMILTimeValueSpecParams::SYNCBASE && !IsEventBased())
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return;
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MOZ_ASSERT(aContextNode,
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"null context node for resolving timing references against");
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// If we're not bound to the document yet, don't worry, we'll get called again
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// when that happens
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if (!aContextNode->IsInUncomposedDoc())
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return;
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// Hold ref to the old element so that it isn't destroyed in between resetting
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// the referenced element and using the pointer to update the referenced
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// element.
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RefPtr<Element> oldReferencedElement = mReferencedElement.get();
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if (mParams.mDependentElemID) {
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mReferencedElement.ResetWithID(aContextNode,
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nsDependentAtomString(mParams.mDependentElemID));
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} else if (mParams.mType == nsSMILTimeValueSpecParams::EVENT) {
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Element* target = mOwner->GetTargetElement();
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mReferencedElement.ResetWithElement(target);
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} else {
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MOZ_ASSERT(false, "Syncbase or repeat spec without ID");
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}
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UpdateReferencedElement(oldReferencedElement, mReferencedElement.get());
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}
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bool
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nsSMILTimeValueSpec::IsEventBased() const
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{
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return mParams.mType == nsSMILTimeValueSpecParams::EVENT ||
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mParams.mType == nsSMILTimeValueSpecParams::REPEAT;
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}
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void
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nsSMILTimeValueSpec::HandleNewInterval(nsSMILInterval& aInterval,
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const nsSMILTimeContainer* aSrcContainer)
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{
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const nsSMILInstanceTime& baseInstance = mParams.mSyncBegin
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? *aInterval.Begin() : *aInterval.End();
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nsSMILTimeValue newTime =
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ConvertBetweenTimeContainers(baseInstance.Time(), aSrcContainer);
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// Apply offset
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if (!ApplyOffset(newTime)) {
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NS_WARNING("New time overflows nsSMILTime, ignoring");
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return;
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}
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// Create the instance time and register it with the interval
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RefPtr<nsSMILInstanceTime> newInstance =
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new nsSMILInstanceTime(newTime, nsSMILInstanceTime::SOURCE_SYNCBASE, this,
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&aInterval);
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mOwner->AddInstanceTime(newInstance, mIsBegin);
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}
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void
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nsSMILTimeValueSpec::HandleTargetElementChange(Element* aNewTarget)
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{
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if (!IsEventBased() || mParams.mDependentElemID)
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return;
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mReferencedElement.ResetWithElement(aNewTarget);
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}
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void
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nsSMILTimeValueSpec::HandleChangedInstanceTime(
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const nsSMILInstanceTime& aBaseTime,
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const nsSMILTimeContainer* aSrcContainer,
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nsSMILInstanceTime& aInstanceTimeToUpdate,
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bool aObjectChanged)
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{
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// If the instance time is fixed (e.g. because it's being used as the begin
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// time of an active or postactive interval) we just ignore the change.
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if (aInstanceTimeToUpdate.IsFixedTime())
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return;
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nsSMILTimeValue updatedTime =
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ConvertBetweenTimeContainers(aBaseTime.Time(), aSrcContainer);
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// Apply offset
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if (!ApplyOffset(updatedTime)) {
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NS_WARNING("Updated time overflows nsSMILTime, ignoring");
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return;
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}
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// The timed element that owns the instance time does the updating so it can
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// re-sort its array of instance times more efficiently
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if (aInstanceTimeToUpdate.Time() != updatedTime || aObjectChanged) {
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mOwner->UpdateInstanceTime(&aInstanceTimeToUpdate, updatedTime, mIsBegin);
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}
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}
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void
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nsSMILTimeValueSpec::HandleDeletedInstanceTime(
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nsSMILInstanceTime &aInstanceTime)
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{
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mOwner->RemoveInstanceTime(&aInstanceTime, mIsBegin);
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}
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bool
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nsSMILTimeValueSpec::DependsOnBegin() const
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{
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return mParams.mSyncBegin;
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}
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void
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nsSMILTimeValueSpec::Traverse(nsCycleCollectionTraversalCallback* aCallback)
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{
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mReferencedElement.Traverse(aCallback);
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}
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void
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nsSMILTimeValueSpec::Unlink()
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{
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UnregisterFromReferencedElement(mReferencedElement.get());
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mReferencedElement.Unlink();
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}
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//----------------------------------------------------------------------
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// Implementation helpers
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void
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nsSMILTimeValueSpec::UpdateReferencedElement(Element* aFrom, Element* aTo)
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{
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if (aFrom == aTo)
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return;
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UnregisterFromReferencedElement(aFrom);
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switch (mParams.mType)
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{
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case nsSMILTimeValueSpecParams::SYNCBASE:
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{
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nsSMILTimedElement* to = GetTimedElement(aTo);
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if (to) {
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to->AddDependent(*this);
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}
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}
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break;
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case nsSMILTimeValueSpecParams::EVENT:
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case nsSMILTimeValueSpecParams::REPEAT:
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RegisterEventListener(aTo);
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break;
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default:
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// not a referencing-type
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break;
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}
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}
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void
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nsSMILTimeValueSpec::UnregisterFromReferencedElement(Element* aElement)
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{
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if (!aElement)
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return;
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if (mParams.mType == nsSMILTimeValueSpecParams::SYNCBASE) {
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nsSMILTimedElement* timedElement = GetTimedElement(aElement);
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if (timedElement) {
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timedElement->RemoveDependent(*this);
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}
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mOwner->RemoveInstanceTimesForCreator(this, mIsBegin);
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} else if (IsEventBased()) {
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UnregisterEventListener(aElement);
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}
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}
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nsSMILTimedElement*
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nsSMILTimeValueSpec::GetTimedElement(Element* aElement)
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{
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return aElement && aElement->IsNodeOfType(nsINode::eANIMATION) ?
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&static_cast<SVGAnimationElement*>(aElement)->TimedElement() : nullptr;
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}
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// Indicates whether we're allowed to register an event-listener
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// when scripting is disabled.
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bool
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nsSMILTimeValueSpec::IsWhitelistedEvent()
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{
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// The category of (SMIL-specific) "repeat(n)" events are allowed.
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if (mParams.mType == nsSMILTimeValueSpecParams::REPEAT) {
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return true;
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}
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// A specific list of other SMIL-related events are allowed, too.
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if (mParams.mType == nsSMILTimeValueSpecParams::EVENT &&
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(mParams.mEventSymbol == nsGkAtoms::repeat ||
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mParams.mEventSymbol == nsGkAtoms::repeatEvent ||
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mParams.mEventSymbol == nsGkAtoms::beginEvent ||
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mParams.mEventSymbol == nsGkAtoms::endEvent)) {
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return true;
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}
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return false;
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}
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void
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nsSMILTimeValueSpec::RegisterEventListener(Element* aTarget)
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{
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MOZ_ASSERT(IsEventBased(),
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"Attempting to register event-listener for unexpected "
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"nsSMILTimeValueSpec type");
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MOZ_ASSERT(mParams.mEventSymbol,
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"Attempting to register event-listener but there is no event "
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"name");
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if (!aTarget)
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return;
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// When script is disabled, only allow registration for whitelisted events.
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if (!aTarget->GetOwnerDocument()->IsScriptEnabled() &&
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!IsWhitelistedEvent()) {
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return;
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}
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if (!mEventListener) {
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mEventListener = new EventListener(this);
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}
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EventListenerManager* elm = aTarget->GetOrCreateListenerManager();
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if (!elm) {
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return;
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}
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elm->AddEventListenerByType(mEventListener,
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nsDependentAtomString(mParams.mEventSymbol),
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AllEventsAtSystemGroupBubble());
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}
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void
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nsSMILTimeValueSpec::UnregisterEventListener(Element* aTarget)
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{
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if (!aTarget || !mEventListener) {
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return;
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}
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EventListenerManager* elm = aTarget->GetOrCreateListenerManager();
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if (!elm) {
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return;
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}
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elm->RemoveEventListenerByType(mEventListener,
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nsDependentAtomString(mParams.mEventSymbol),
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AllEventsAtSystemGroupBubble());
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}
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void
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nsSMILTimeValueSpec::HandleEvent(Event* aEvent)
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{
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MOZ_ASSERT(mEventListener, "Got event without an event listener");
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MOZ_ASSERT(IsEventBased(),
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"Got event for non-event nsSMILTimeValueSpec");
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MOZ_ASSERT(aEvent, "No event supplied");
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// XXX In the long run we should get the time from the event itself which will
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// store the time in global document time which we'll need to convert to our
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// time container
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nsSMILTimeContainer* container = mOwner->GetTimeContainer();
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if (!container)
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return;
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if (mParams.mType == nsSMILTimeValueSpecParams::REPEAT &&
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!CheckRepeatEventDetail(aEvent)) {
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return;
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}
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nsSMILTime currentTime = container->GetCurrentTime();
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nsSMILTimeValue newTime(currentTime);
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if (!ApplyOffset(newTime)) {
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NS_WARNING("New time generated from event overflows nsSMILTime, ignoring");
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return;
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}
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RefPtr<nsSMILInstanceTime> newInstance =
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new nsSMILInstanceTime(newTime, nsSMILInstanceTime::SOURCE_EVENT);
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mOwner->AddInstanceTime(newInstance, mIsBegin);
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}
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bool
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nsSMILTimeValueSpec::CheckRepeatEventDetail(Event *aEvent)
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{
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TimeEvent* timeEvent = aEvent->AsTimeEvent();
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if (!timeEvent) {
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NS_WARNING("Received a repeat event that was not a DOMTimeEvent");
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return false;
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}
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int32_t detail = timeEvent->Detail();
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return detail > 0 && (uint32_t)detail == mParams.mRepeatIteration;
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}
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nsSMILTimeValue
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nsSMILTimeValueSpec::ConvertBetweenTimeContainers(
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const nsSMILTimeValue& aSrcTime,
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const nsSMILTimeContainer* aSrcContainer)
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{
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// If the source time is either indefinite or unresolved the result is going
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// to be the same
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if (!aSrcTime.IsDefinite())
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return aSrcTime;
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// Convert from source time container to our parent time container
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const nsSMILTimeContainer* dstContainer = mOwner->GetTimeContainer();
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if (dstContainer == aSrcContainer)
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return aSrcTime;
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// If one of the elements is not attached to a time container then we can't do
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// any meaningful conversion
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if (!aSrcContainer || !dstContainer)
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return nsSMILTimeValue(); // unresolved
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nsSMILTimeValue docTime =
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aSrcContainer->ContainerToParentTime(aSrcTime.GetMillis());
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if (docTime.IsIndefinite())
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// This will happen if the source container is paused and we have a future
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// time. Just return the indefinite time.
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return docTime;
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MOZ_ASSERT(docTime.IsDefinite(),
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"ContainerToParentTime gave us an unresolved or indefinite time");
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return dstContainer->ParentToContainerTime(docTime.GetMillis());
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}
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bool
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nsSMILTimeValueSpec::ApplyOffset(nsSMILTimeValue& aTime) const
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{
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// indefinite + offset = indefinite. Likewise for unresolved times.
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if (!aTime.IsDefinite()) {
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return true;
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}
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double resultAsDouble =
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(double)aTime.GetMillis() + mParams.mOffset.GetMillis();
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if (resultAsDouble > std::numeric_limits<nsSMILTime>::max() ||
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resultAsDouble < std::numeric_limits<nsSMILTime>::min()) {
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return false;
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}
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aTime.SetMillis(aTime.GetMillis() + mParams.mOffset.GetMillis());
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return true;
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}
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