/* -*- 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, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef NS_SMILTIMECONTAINER_H_ #define NS_SMILTIMECONTAINER_H_ #include "mozilla/dom/SVGAnimationElement.h" #include "nscore.h" #include "nsSMILTypes.h" #include "nsTPriorityQueue.h" #include "nsSMILMilestone.h" class nsSMILTimeValue; //---------------------------------------------------------------------- // nsSMILTimeContainer // // Common base class for a time base that can be paused, resumed, and sampled. // class nsSMILTimeContainer { public: nsSMILTimeContainer(); virtual ~nsSMILTimeContainer(); /* * Pause request types. */ enum { PAUSE_BEGIN = 1, // Paused because timeline has yet to begin. PAUSE_SCRIPT = 2, // Paused by script. PAUSE_PAGEHIDE = 4, // Paused because our doc is hidden. PAUSE_USERPREF = 8, // Paused because animations are disabled in prefs. PAUSE_IMAGE = 16 // Paused becuase we're in an image that's suspended. }; /* * Cause the time container to record its begin time. */ void Begin(); /* * Pause this time container * * @param aType The source of the pause request. Successive calls to Pause * with the same aType will be ignored. The container will remain paused until * each call to Pause of a given aType has been matched by at least one call * to Resume with the same aType. */ virtual void Pause(uint32_t aType); /* * Resume this time container * * param @aType The source of the resume request. Clears the pause flag for * this particular type of pause request. When all pause flags have been * cleared the time container will be resumed. */ virtual void Resume(uint32_t aType); /** * Returns true if this time container is paused by the specified type. * Note that the time container may also be paused by other types; this method * does not test if aType is the exclusive pause source. * * @param @aType The pause source to test for. * @return true if this container is paused by aType. */ bool IsPausedByType(uint32_t aType) const { return mPauseState & aType; } /** * Returns true if this time container is paused. * Generally you should test for a specific type of pausing using * IsPausedByType. * * @return true if this container is paused, false otherwise. */ bool IsPaused() const { return mPauseState != 0; } /* * Return the time elapsed since this time container's begin time (expressed * in parent time) minus any accumulated offset from pausing. */ nsSMILTime GetCurrentTime() const; /* * Seek the document timeline to the specified time. * * @param aSeekTo The time to seek to, expressed in this time container's time * base (i.e. the same units as GetCurrentTime). */ void SetCurrentTime(nsSMILTime aSeekTo); /* * Return the current time for the parent time container if any. */ virtual nsSMILTime GetParentTime() const; /* * Convert container time to parent time. * * @param aContainerTime The container time to convert. * @return The equivalent parent time or indefinite if the container is * paused and the time is in the future. */ nsSMILTimeValue ContainerToParentTime(nsSMILTime aContainerTime) const; /* * Convert from parent time to container time. * * @param aParentTime The parent time to convert. * @return The equivalent container time or indefinite if the container is * paused and aParentTime is after the time when the pause began. */ nsSMILTimeValue ParentToContainerTime(nsSMILTime aParentTime) const; /* * If the container is paused, causes the pause time to be updated to the * current parent time. This should be called before updating * cross-container dependencies that will call ContainerToParentTime in order * to provide more intuitive results. */ void SyncPauseTime(); /* * Updates the current time of this time container and calls DoSample to * perform any sample-operations. */ void Sample(); /* * Return if this time container should be sampled or can be skipped. * * This is most useful as an optimisation for skipping time containers that * don't require a sample. */ bool NeedsSample() const { return !mPauseState || mNeedsPauseSample; } /* * Indicates if the elements of this time container need to be rewound. * This occurs during a backwards seek. */ bool NeedsRewind() const { return mNeedsRewind; } void ClearNeedsRewind() { mNeedsRewind = false; } /* * Indicates the time container is currently processing a SetCurrentTime * request and appropriate seek behaviour should be applied by child elements * (e.g. not firing time events). */ bool IsSeeking() const { return mIsSeeking; } void MarkSeekFinished() { mIsSeeking = false; } /* * Sets the parent time container. * * The callee still retains ownership of the time container. */ nsresult SetParent(nsSMILTimeContainer* aParent); /* * Registers an element for a sample at the given time. * * @param aMilestone The milestone to register in container time. * @param aElement The timebase element that needs a sample at * aMilestone. * @return true if the element was successfully added, false otherwise. */ bool AddMilestone(const nsSMILMilestone& aMilestone, mozilla::dom::SVGAnimationElement& aElement); /* * Resets the list of milestones. */ void ClearMilestones(); /* * Returns the next significant transition from amongst the registered * milestones. * * @param[out] aNextMilestone The next milestone with time in parent time. * * @return true if there exists another milestone, false otherwise in * which case aNextMilestone will be unmodified. */ bool GetNextMilestoneInParentTime(nsSMILMilestone& aNextMilestone) const; typedef nsTArray<RefPtr<mozilla::dom::SVGAnimationElement> > AnimElemArray; /* * Removes and returns the timebase elements from the start of the list of * timebase elements that match the given time. * * @param aMilestone The milestone time to match in parent time. This * must be <= GetNextMilestoneInParentTime. * @param[out] aMatchedElements The array to which matching elements will be * appended. * @return true if one or more elements match, false otherwise. */ bool PopMilestoneElementsAtMilestone(const nsSMILMilestone& aMilestone, AnimElemArray& aMatchedElements); // Cycle-collection support void Traverse(nsCycleCollectionTraversalCallback* aCallback); void Unlink(); protected: /* * Per-sample operations to be performed whenever Sample() is called and * NeedsSample() is true. Called after updating mCurrentTime; */ virtual void DoSample() { } /* * Adding and removing child containers is not implemented in the base class * because not all subclasses need this. */ /* * Adds a child time container. */ virtual nsresult AddChild(nsSMILTimeContainer& aChild) { return NS_ERROR_FAILURE; } /* * Removes a child time container. */ virtual void RemoveChild(nsSMILTimeContainer& aChild) { } /* * Implementation helper to update the current time. */ void UpdateCurrentTime(); /* * Implementation helper to notify timed elements with dependencies that the * container time has changed with respect to the document time. */ void NotifyTimeChange(); // The parent time container, if any nsSMILTimeContainer* mParent; // The current time established at the last call to Sample() nsSMILTime mCurrentTime; // The number of milliseconds for which the container has been paused // (excluding the current pause interval if the container is currently // paused). // // Current time = parent time - mParentOffset // nsSMILTime mParentOffset; // The timestamp in parent time when the container was paused nsSMILTime mPauseStart; // Whether or not a pause sample is required bool mNeedsPauseSample; bool mNeedsRewind; // Backwards seek performed bool mIsSeeking; // Currently in the middle of a seek operation bool mHoldingEntries; // True if there's a raw pointer to mMilestoneEntries on the stack. // A bitfield of the pause state for all pause requests uint32_t mPauseState; struct MilestoneEntry { MilestoneEntry(nsSMILMilestone aMilestone, mozilla::dom::SVGAnimationElement& aElement) : mMilestone(aMilestone), mTimebase(&aElement) { } bool operator<(const MilestoneEntry& aOther) const { return mMilestone < aOther.mMilestone; } nsSMILMilestone mMilestone; // In container time. RefPtr<mozilla::dom::SVGAnimationElement> mTimebase; }; // Queue of elements with registered milestones. Used to update the model with // significant transitions that occur between two samples. Since timed element // re-register their milestones when they're sampled this is reset once we've // taken care of the milestones before the current sample time but before we // actually do the full sample. nsTPriorityQueue<MilestoneEntry> mMilestoneEntries; }; #endif // NS_SMILTIMECONTAINER_H_