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gecko/dom/smil/nsSMILTimedElement.h
Brian Birtles 2c94db21f2 Bug 1010681 part 1 - Add nsSMILTimedElement::SetIsDisabled for turning off a timed element; r=longsonr 
This method is added so that animation elements that fail conditional processing
tests can disable the corresponding timed element. Currently, this handling is
performed by the animation controller which simply skips sampling animations
that fail tests. However, this doesn't provide the correct behavior since
"skipped" animations can still have intervals that trigger syncbase dependencies
etc. Also, we still do milestone samples for "skipped" animations which can
lead to cases where we are in an inconsistent state.

This patch provides a method that will be used in subsequent patches to more
correctly remove the effects of a timed element.

To do this, this patch also factors out some common methods for clearing timing
state that can be shared with the Rewind method.
2014-05-28 14:13:31 +09:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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_SMILTIMEDELEMENT_H_
#define NS_SMILTIMEDELEMENT_H_
#include "mozilla/Move.h"
#include "nsSMILInterval.h"
#include "nsSMILInstanceTime.h"
#include "nsSMILMilestone.h"
#include "nsSMILTimeValueSpec.h"
#include "nsSMILRepeatCount.h"
#include "nsSMILTypes.h"
#include "nsTArray.h"
#include "nsTHashtable.h"
#include "nsHashKeys.h"
#include "nsAutoPtr.h"
#include "nsAttrValue.h"
class nsSMILAnimationFunction;
class nsSMILTimeContainer;
class nsSMILTimeValue;
class nsIAtom;
namespace mozilla {
namespace dom {
class SVGAnimationElement;
}
}
//----------------------------------------------------------------------
// nsSMILTimedElement
class nsSMILTimedElement
{
public:
nsSMILTimedElement();
~nsSMILTimedElement();
typedef mozilla::dom::Element Element;
/*
* Sets the owning animation element which this class uses to convert between
* container times and to register timebase elements.
*/
void SetAnimationElement(mozilla::dom::SVGAnimationElement* aElement);
/*
* Returns the time container with which this timed element is associated or
* nullptr if it is not associated with a time container.
*/
nsSMILTimeContainer* GetTimeContainer();
/*
* Returns the element targeted by the animation element. Needed for
* registering event listeners against the appropriate element.
*/
mozilla::dom::Element* GetTargetElement();
/**
* Methods for supporting the nsIDOMElementTimeControl interface.
*/
/*
* Adds a new begin instance time at the current container time plus or minus
* the specified offset.
*
* @param aOffsetSeconds A real number specifying the number of seconds to add
* to the current container time.
* @return NS_OK if the operation succeeeded, or an error code otherwise.
*/
nsresult BeginElementAt(double aOffsetSeconds);
/*
* Adds a new end instance time at the current container time plus or minus
* the specified offset.
*
* @param aOffsetSeconds A real number specifying the number of seconds to add
* to the current container time.
* @return NS_OK if the operation succeeeded, or an error code otherwise.
*/
nsresult EndElementAt(double aOffsetSeconds);
/**
* Methods for supporting the nsSVGAnimationElement interface.
*/
/**
* According to SVG 1.1 SE this returns
*
* the begin time, in seconds, for this animation element's current
* interval, if it exists, regardless of whether the interval has begun yet.
*
* @return the start time as defined above in milliseconds or an unresolved
* time if there is no current interval.
*/
nsSMILTimeValue GetStartTime() const;
/**
* Returns the simple duration of this element.
*
* @return the simple duration in milliseconds or INDEFINITE.
*/
nsSMILTimeValue GetSimpleDuration() const
{
return mSimpleDur;
}
/**
* Methods for supporting hyperlinking
*/
/**
* Internal SMIL methods
*/
/**
* Returns the time to seek the document to when this element is targetted by
* a hyperlink.
*
* The behavior is defined here:
* http://www.w3.org/TR/smil-animation/#HyperlinkSemantics
*
* It is very similar to GetStartTime() with the exception that when the
* element is not active, the begin time of the *first* interval is returned.
*
* @return the time to seek the documen to in milliseconds or an unresolved
* time if there is no resolved interval.
*/
nsSMILTimeValue GetHyperlinkTime() const;
/**
* Adds an instance time object this element's list of instance times.
* These instance times are used when creating intervals.
*
* This method is typically called by an nsSMILTimeValueSpec.
*
* @param aInstanceTime The time to add, expressed in container time.
* @param aIsBegin true if the time to be added represents a begin
* time or false if it represents an end time.
*/
void AddInstanceTime(nsSMILInstanceTime* aInstanceTime, bool aIsBegin);
/**
* Requests this element update the given instance time.
*
* This method is typically called by a child nsSMILTimeValueSpec.
*
* @param aInstanceTime The instance time to update.
* @param aUpdatedTime The time to update aInstanceTime with.
* @param aDependentTime The instance time upon which aInstanceTime should be
* based.
* @param aIsBegin true if the time to be updated represents a begin
* instance time or false if it represents an end
* instance time.
*/
void UpdateInstanceTime(nsSMILInstanceTime* aInstanceTime,
nsSMILTimeValue& aUpdatedTime,
bool aIsBegin);
/**
* Removes an instance time object from this element's list of instance times.
*
* This method is typically called by a child nsSMILTimeValueSpec.
*
* @param aInstanceTime The instance time to remove.
* @param aIsBegin true if the time to be removed represents a begin
* time or false if it represents an end time.
*/
void RemoveInstanceTime(nsSMILInstanceTime* aInstanceTime, bool aIsBegin);
/**
* Removes all the instance times associated with the given
* nsSMILTimeValueSpec object. Used when an ID assignment changes and hence
* all the previously associated instance times become invalid.
*
* @param aSpec The nsSMILTimeValueSpec object whose created
* nsSMILInstanceTime's should be removed.
* @param aIsBegin true if the times to be removed represent begin
* times or false if they are end times.
*/
void RemoveInstanceTimesForCreator(const nsSMILTimeValueSpec* aSpec,
bool aIsBegin);
/**
* Sets the object that will be called by this timed element each time it is
* sampled.
*
* In Schmitz's model it is possible to associate several time clients with
* a timed element but for now we only allow one.
*
* @param aClient The time client to associate. Any previous time client
* will be disassociated and no longer sampled. Setting this
* to nullptr will simply disassociate the previous client, if
* any.
*/
void SetTimeClient(nsSMILAnimationFunction* aClient);
/**
* Samples the object at the given container time. Timing intervals are
* updated and if this element is active at the given time the associated time
* client will be sampled with the appropriate simple time.
*
* @param aContainerTime The container time at which to sample.
*/
void SampleAt(nsSMILTime aContainerTime);
/**
* Performs a special sample for the end of an interval. Such a sample should
* only advance the timed element (and any dependent elements) to the waiting
* or postactive state. It should not cause a transition to the active state.
* Transition to the active state is only performed on a regular SampleAt.
*
* This allows all interval ends at a given time to be processed first and
* hence the new interval can be established based on full information of the
* available instance times.
*
* @param aContainerTime The container time at which to sample.
*/
void SampleEndAt(nsSMILTime aContainerTime);
/**
* Informs the timed element that its time container has changed time
* relative to document time. The timed element therefore needs to update its
* dependent elements (which may belong to a different time container) so they
* can re-resolve their times.
*/
void HandleContainerTimeChange();
/**
* Resets this timed element's accumulated times and intervals back to start
* up state.
*
* This is used for backwards seeking where rather than accumulating
* historical timing state and winding it back, we reset the element and seek
* forwards.
*/
void Rewind();
/**
* Marks this element as disabled or not. If the element is disabled, it
* will ignore any future samples and discard any accumulated timing state.
*
* This is used by SVG to "turn off" timed elements when the associated
* animation element has failing conditional processing tests.
*
* Returns true if the disabled state of the timed element was changed
* as a result of this call (i.e. it was not a redundant call).
*/
bool SetIsDisabled(bool aIsDisabled);
/**
* Attempts to set an attribute on this timed element.
*
* @param aAttribute The name of the attribute to set. The namespace of this
* attribute is not specified as it is checked by the host
* element. Only attributes in the namespace defined for
* SMIL attributes in the host language are passed to the
* timed element.
* @param aValue The attribute value.
* @param aResult The nsAttrValue object that may be used for storing the
* parsed result.
* @param aContextNode The element to use for context when resolving
* references to other elements.
* @param[out] aParseResult The result of parsing the attribute. Will be set
* to NS_OK if parsing is successful.
*
* @return true if the given attribute is a timing attribute, false
* otherwise.
*/
bool SetAttr(nsIAtom* aAttribute, const nsAString& aValue,
nsAttrValue& aResult, Element* aContextNode,
nsresult* aParseResult = nullptr);
/**
* Attempts to unset an attribute on this timed element.
*
* @param aAttribute The name of the attribute to set. As with SetAttr the
* namespace of the attribute is not specified (see
* SetAttr).
*
* @return true if the given attribute is a timing attribute, false
* otherwise.
*/
bool UnsetAttr(nsIAtom* aAttribute);
/**
* Adds a syncbase dependency to the list of dependents that will be notified
* when this timed element creates, deletes, or updates its current interval.
*
* @param aDependent The nsSMILTimeValueSpec object to notify. A raw pointer
* to this object will be stored. Therefore it is necessary
* for the object to be explicitly unregistered (with
* RemoveDependent) when it is destroyed.
*/
void AddDependent(nsSMILTimeValueSpec& aDependent);
/**
* Removes a syncbase dependency from the list of dependents that are notified
* when the current interval is modified.
*
* @param aDependent The nsSMILTimeValueSpec object to unregister.
*/
void RemoveDependent(nsSMILTimeValueSpec& aDependent);
/**
* Determines if this timed element is dependent on the given timed element's
* begin time for the interval currently in effect. Whilst the element is in
* the active state this is the current interval and in the postactive or
* waiting state this is the previous interval if one exists. In all other
* cases the element is not considered a time dependent of any other element.
*
* @param aOther The potential syncbase element.
* @return true if this timed element's begin time for the currently
* effective interval is directly or indirectly derived from aOther, false
* otherwise.
*/
bool IsTimeDependent(const nsSMILTimedElement& aOther) const;
/**
* Called when the timed element has been bound to the document so that
* references from this timed element to other elements can be resolved.
*
* @param aContextNode The node which provides the necessary context for
* resolving references. This is typically the element in
* the host language that owns this timed element. Should
* not be null.
*/
void BindToTree(nsIContent* aContextNode);
/**
* Called when the target of the animation has changed so that event
* registrations can be updated.
*/
void HandleTargetElementChange(mozilla::dom::Element* aNewTarget);
/**
* Called when the timed element has been removed from a document so that
* references to other elements can be broken.
*/
void DissolveReferences() { Unlink(); }
// Cycle collection
void Traverse(nsCycleCollectionTraversalCallback* aCallback);
void Unlink();
typedef bool (*RemovalTestFunction)(nsSMILInstanceTime* aInstance);
protected:
// Typedefs
typedef nsTArray<nsAutoPtr<nsSMILTimeValueSpec> > TimeValueSpecList;
typedef nsTArray<nsRefPtr<nsSMILInstanceTime> > InstanceTimeList;
typedef nsTArray<nsAutoPtr<nsSMILInterval> > IntervalList;
typedef nsPtrHashKey<nsSMILTimeValueSpec> TimeValueSpecPtrKey;
typedef nsTHashtable<TimeValueSpecPtrKey> TimeValueSpecHashSet;
// Helper classes
class InstanceTimeComparator {
public:
bool Equals(const nsSMILInstanceTime* aElem1,
const nsSMILInstanceTime* aElem2) const;
bool LessThan(const nsSMILInstanceTime* aElem1,
const nsSMILInstanceTime* aElem2) const;
};
struct NotifyTimeDependentsParams {
nsSMILTimedElement* mTimedElement;
nsSMILTimeContainer* mTimeContainer;
};
// Templated helper functions
template <class TestFunctor>
void RemoveInstanceTimes(InstanceTimeList& aArray, TestFunctor& aTest);
//
// Implementation helpers
//
nsresult SetBeginSpec(const nsAString& aBeginSpec,
Element* aContextNode,
RemovalTestFunction aRemove);
nsresult SetEndSpec(const nsAString& aEndSpec,
Element* aContextNode,
RemovalTestFunction aRemove);
nsresult SetSimpleDuration(const nsAString& aDurSpec);
nsresult SetMin(const nsAString& aMinSpec);
nsresult SetMax(const nsAString& aMaxSpec);
nsresult SetRestart(const nsAString& aRestartSpec);
nsresult SetRepeatCount(const nsAString& aRepeatCountSpec);
nsresult SetRepeatDur(const nsAString& aRepeatDurSpec);
nsresult SetFillMode(const nsAString& aFillModeSpec);
void UnsetBeginSpec(RemovalTestFunction aRemove);
void UnsetEndSpec(RemovalTestFunction aRemove);
void UnsetSimpleDuration();
void UnsetMin();
void UnsetMax();
void UnsetRestart();
void UnsetRepeatCount();
void UnsetRepeatDur();
void UnsetFillMode();
nsresult SetBeginOrEndSpec(const nsAString& aSpec,
Element* aContextNode,
bool aIsBegin,
RemovalTestFunction aRemove);
void ClearSpecs(TimeValueSpecList& aSpecs,
InstanceTimeList& aInstances,
RemovalTestFunction aRemove);
void ClearIntervals();
void DoSampleAt(nsSMILTime aContainerTime, bool aEndOnly);
/**
* Helper function to check for an early end and, if necessary, update the
* current interval accordingly.
*
* See SMIL 3.0, section 5.4.5, Element life cycle, "Active Time - Playing an
* interval" for a description of ending early.
*
* @param aSampleTime The current sample time. Early ends should only be
* applied at the last possible moment (i.e. if they are at
* or before the current sample time) and only if the
* current interval is not already ending.
* @return true if the end time of the current interval was updated,
* false otherwise.
*/
bool ApplyEarlyEnd(const nsSMILTimeValue& aSampleTime);
/**
* Clears certain state in response to the element restarting.
*
* This state is described in SMIL 3.0, section 5.4.3, Resetting element state
*/
void Reset();
/**
* Clears all accumulated timing state except for those instance times for
* which aRemove does not return true.
*
* Unlike the Reset method which only clears instance times, this clears the
* element's state, intervals (including current interval), and tells the
* client animation function to stop applying a result. In effect, it returns
* the element to its initial state but preserves any instance times excluded
* by the passed-in function.
*/
void ClearTimingState(RemovalTestFunction aRemove);
/**
* Recreates timing state by re-applying begin/end attributes specified on
* the associated animation element.
*
* Note that this does not completely restore the information cleared by
* ClearTimingState since it leaves the element in the startup state.
* The element state will be updated on the next sample.
*/
void RebuildTimingState(RemovalTestFunction aRemove);
/**
* Completes a seek operation by sending appropriate events and, in the case
* of a backwards seek, updating the state of timing information that was
* previously considered historical.
*/
void DoPostSeek();
/**
* Unmarks instance times that were previously preserved because they were
* considered important historical milestones but are no longer such because
* a backwards seek has been performed.
*/
void UnpreserveInstanceTimes(InstanceTimeList& aList);
/**
* Helper function to iterate through this element's accumulated timing
* information (specifically old nsSMILIntervals and nsSMILTimeInstanceTimes)
* and discard items that are no longer needed or exceed some threshold of
* accumulated state.
*/
void FilterHistory();
// Helper functions for FilterHistory to clear old nsSMILIntervals and
// nsSMILInstanceTimes respectively.
void FilterIntervals();
void FilterInstanceTimes(InstanceTimeList& aList);
/**
* Calculates the next acceptable interval for this element after the
* specified interval, or, if no previous interval is specified, it will be
* the first interval with an end time after t=0.
*
* @see SMILANIM 3.6.8
*
* @param aPrevInterval The previous interval used. If supplied, the first
* interval that begins after aPrevInterval will be
* returned. May be nullptr.
* @param aReplacedInterval The interval that is being updated (if any). This
* used to ensure we don't return interval endpoints
* that are dependent on themselves. May be nullptr.
* @param aFixedBeginTime The time to use for the start of the interval. This
* is used when only the endpoint of the interval
* should be updated such as when the animation is in
* the ACTIVE state. May be nullptr.
* @param[out] aResult The next interval. Will be unchanged if no suitable
* interval was found (in which case false will be
* returned).
* @return true if a suitable interval was found, false otherwise.
*/
bool GetNextInterval(const nsSMILInterval* aPrevInterval,
const nsSMILInterval* aReplacedInterval,
const nsSMILInstanceTime* aFixedBeginTime,
nsSMILInterval& aResult) const;
nsSMILInstanceTime* GetNextGreater(const InstanceTimeList& aList,
const nsSMILTimeValue& aBase,
int32_t& aPosition) const;
nsSMILInstanceTime* GetNextGreaterOrEqual(const InstanceTimeList& aList,
const nsSMILTimeValue& aBase,
int32_t& aPosition) const;
nsSMILTimeValue CalcActiveEnd(const nsSMILTimeValue& aBegin,
const nsSMILTimeValue& aEnd) const;
nsSMILTimeValue GetRepeatDuration() const;
nsSMILTimeValue ApplyMinAndMax(const nsSMILTimeValue& aDuration) const;
nsSMILTime ActiveTimeToSimpleTime(nsSMILTime aActiveTime,
uint32_t& aRepeatIteration);
nsSMILInstanceTime* CheckForEarlyEnd(
const nsSMILTimeValue& aContainerTime) const;
void UpdateCurrentInterval(bool aForceChangeNotice = false);
void SampleSimpleTime(nsSMILTime aActiveTime);
void SampleFillValue();
nsresult AddInstanceTimeFromCurrentTime(nsSMILTime aCurrentTime,
double aOffsetSeconds, bool aIsBegin);
void RegisterMilestone();
bool GetNextMilestone(nsSMILMilestone& aNextMilestone) const;
// Notification methods. Note that these notifications can result in nested
// calls to this same object. Therefore,
// (i) we should not perform notification until this object is in
// a consistent state to receive callbacks, and
// (ii) after calling these methods we must assume that the state of the
// element may have changed.
void NotifyNewInterval();
void NotifyChangedInterval(nsSMILInterval* aInterval,
bool aBeginObjectChanged,
bool aEndObjectChanged);
void FireTimeEventAsync(uint32_t aMsg, int32_t aDetail);
const nsSMILInstanceTime* GetEffectiveBeginInstance() const;
const nsSMILInterval* GetPreviousInterval() const;
bool HasPlayed() const { return !mOldIntervals.IsEmpty(); }
bool HasClientInFillRange() const;
bool EndHasEventConditions() const;
bool AreEndTimesDependentOn(
const nsSMILInstanceTime* aBase) const;
// Reset the current interval by first passing ownership to a temporary
// variable so that if Unlink() results in us receiving a callback,
// mCurrentInterval will be nullptr and we will be in a consistent state.
void ResetCurrentInterval()
{
if (mCurrentInterval) {
// Transfer ownership to temp var. (This sets mCurrentInterval to null.)
nsAutoPtr<nsSMILInterval> interval(mozilla::Move(mCurrentInterval));
interval->Unlink();
}
}
// Hashtable callback methods
static PLDHashOperator NotifyNewIntervalCallback(
TimeValueSpecPtrKey* aKey, void* aData);
//
// Members
//
mozilla::dom::SVGAnimationElement* mAnimationElement; // [weak] won't outlive
// owner
TimeValueSpecList mBeginSpecs; // [strong]
TimeValueSpecList mEndSpecs; // [strong]
nsSMILTimeValue mSimpleDur;
nsSMILRepeatCount mRepeatCount;
nsSMILTimeValue mRepeatDur;
nsSMILTimeValue mMin;
nsSMILTimeValue mMax;
enum nsSMILFillMode
{
FILL_REMOVE,
FILL_FREEZE
};
nsSMILFillMode mFillMode;
static nsAttrValue::EnumTable sFillModeTable[];
enum nsSMILRestartMode
{
RESTART_ALWAYS,
RESTART_WHENNOTACTIVE,
RESTART_NEVER
};
nsSMILRestartMode mRestartMode;
static nsAttrValue::EnumTable sRestartModeTable[];
InstanceTimeList mBeginInstances;
InstanceTimeList mEndInstances;
uint32_t mInstanceSerialIndex;
nsSMILAnimationFunction* mClient;
nsAutoPtr<nsSMILInterval> mCurrentInterval;
IntervalList mOldIntervals;
uint32_t mCurrentRepeatIteration;
nsSMILMilestone mPrevRegisteredMilestone;
static const nsSMILMilestone sMaxMilestone;
static const uint8_t sMaxNumIntervals;
static const uint8_t sMaxNumInstanceTimes;
// Set of dependent time value specs to be notified when establishing a new
// current interval. Change notifications and delete notifications are handled
// by the interval.
//
// [weak] The nsSMILTimeValueSpec objects register themselves and unregister
// on destruction. Likewise, we notify them when we are destroyed.
TimeValueSpecHashSet mTimeDependents;
/**
* The state of the element in its life-cycle. These states are based on the
* element life-cycle described in SMILANIM 3.6.8
*/
enum nsSMILElementState
{
STATE_STARTUP,
STATE_WAITING,
STATE_ACTIVE,
STATE_POSTACTIVE
};
nsSMILElementState mElementState;
enum nsSMILSeekState
{
SEEK_NOT_SEEKING,
SEEK_FORWARD_FROM_ACTIVE,
SEEK_FORWARD_FROM_INACTIVE,
SEEK_BACKWARD_FROM_ACTIVE,
SEEK_BACKWARD_FROM_INACTIVE
};
nsSMILSeekState mSeekState;
// Used to batch updates to the timing model
class AutoIntervalUpdateBatcher;
bool mDeferIntervalUpdates;
bool mDoDeferredUpdate; // Set if an update to the current interval was
// requested while mDeferIntervalUpdates was set
bool mIsDisabled;
// Stack-based helper class to call UpdateCurrentInterval when it is destroyed
class AutoIntervalUpdater;
// Recursion depth checking
uint8_t mDeleteCount;
uint8_t mUpdateIntervalRecursionDepth;
static const uint8_t sMaxUpdateIntervalRecursionDepth;
};
#endif // NS_SMILTIMEDELEMENT_H_
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