mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-11 02:56:06 +00:00
168 lines
6.6 KiB
C++
168 lines
6.6 KiB
C++
/* -*- 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_SMILINSTANCETIME_H_
|
|
#define NS_SMILINSTANCETIME_H_
|
|
|
|
#include "nsSMILTimeValue.h"
|
|
#include "nsAutoPtr.h"
|
|
|
|
class nsSMILInterval;
|
|
class nsSMILTimeContainer;
|
|
class nsSMILTimeValueSpec;
|
|
|
|
//----------------------------------------------------------------------
|
|
// nsSMILInstanceTime
|
|
//
|
|
// An instant in document simple time that may be used in creating a new
|
|
// interval.
|
|
//
|
|
// For an overview of how this class is related to other SMIL time classes see
|
|
// the documentation in nsSMILTimeValue.h
|
|
//
|
|
// These objects are owned by an nsSMILTimedElement but MAY also be referenced
|
|
// by:
|
|
//
|
|
// a) nsSMILIntervals that belong to the same nsSMILTimedElement and which refer
|
|
// to the nsSMILInstanceTimes which form the interval endpoints; and/or
|
|
// b) nsSMILIntervals that belong to other nsSMILTimedElements but which need to
|
|
// update dependent instance times when they change or are deleted.
|
|
// E.g. for begin='a.begin', 'a' needs to inform dependent
|
|
// nsSMILInstanceTimes if its begin time changes. This notification is
|
|
// performed by the nsSMILInterval.
|
|
|
|
class nsSMILInstanceTime final
|
|
{
|
|
public:
|
|
// Instance time source. Times generated by events, syncbase relationships,
|
|
// and DOM calls behave differently in some circumstances such as when a timed
|
|
// element is reset.
|
|
enum nsSMILInstanceTimeSource {
|
|
// No particularly significant source, e.g. offset time, 'indefinite'
|
|
SOURCE_NONE,
|
|
// Generated by a DOM call such as beginElement
|
|
SOURCE_DOM,
|
|
// Generated by a syncbase relationship
|
|
SOURCE_SYNCBASE,
|
|
// Generated by an event
|
|
SOURCE_EVENT
|
|
};
|
|
|
|
explicit nsSMILInstanceTime(const nsSMILTimeValue& aTime,
|
|
nsSMILInstanceTimeSource aSource = SOURCE_NONE,
|
|
nsSMILTimeValueSpec* aCreator = nullptr,
|
|
nsSMILInterval* aBaseInterval = nullptr);
|
|
|
|
void Unlink();
|
|
void HandleChangedInterval(const nsSMILTimeContainer* aSrcContainer,
|
|
bool aBeginObjectChanged,
|
|
bool aEndObjectChanged);
|
|
void HandleDeletedInterval();
|
|
void HandleFilteredInterval();
|
|
|
|
const nsSMILTimeValue& Time() const { return mTime; }
|
|
const nsSMILTimeValueSpec* GetCreator() const { return mCreator; }
|
|
|
|
bool IsDynamic() const { return !!(mFlags & kDynamic); }
|
|
bool IsFixedTime() const { return !(mFlags & kMayUpdate); }
|
|
bool FromDOM() const { return !!(mFlags & kFromDOM); }
|
|
|
|
bool ShouldPreserve() const;
|
|
void UnmarkShouldPreserve();
|
|
|
|
void AddRefFixedEndpoint();
|
|
void ReleaseFixedEndpoint();
|
|
|
|
void DependentUpdate(const nsSMILTimeValue& aNewTime)
|
|
{
|
|
MOZ_ASSERT(!IsFixedTime(),
|
|
"Updating an instance time that is not expected to be updated");
|
|
mTime = aNewTime;
|
|
}
|
|
|
|
bool IsDependent() const { return !!mBaseInterval; }
|
|
bool IsDependentOn(const nsSMILInstanceTime& aOther) const;
|
|
const nsSMILInterval* GetBaseInterval() const { return mBaseInterval; }
|
|
const nsSMILInstanceTime* GetBaseTime() const;
|
|
|
|
bool SameTimeAndBase(const nsSMILInstanceTime& aOther) const
|
|
{
|
|
return mTime == aOther.mTime && GetBaseTime() == aOther.GetBaseTime();
|
|
}
|
|
|
|
// Get and set a serial number which may be used by a containing class to
|
|
// control the sort order of otherwise similar instance times.
|
|
uint32_t Serial() const { return mSerial; }
|
|
void SetSerial(uint32_t aIndex) { mSerial = aIndex; }
|
|
|
|
NS_INLINE_DECL_REFCOUNTING(nsSMILInstanceTime)
|
|
|
|
private:
|
|
// Private destructor, to discourage deletion outside of Release():
|
|
~nsSMILInstanceTime();
|
|
|
|
void SetBaseInterval(nsSMILInterval* aBaseInterval);
|
|
|
|
nsSMILTimeValue mTime;
|
|
|
|
// Internal flags used to represent the behaviour of different instance times
|
|
enum {
|
|
// Indicates that this instance time was generated by an event or a DOM
|
|
// call. Such instance times require special handling when (i) the owning
|
|
// element is reset, (ii) when they are to be added as a new end instance
|
|
// times (as per SMIL's event sensitivity contraints), and (iii) when
|
|
// a backwards seek is performed and the timing model is reconstructed.
|
|
kDynamic = 1,
|
|
|
|
// Indicates that this instance time is referred to by an
|
|
// nsSMILTimeValueSpec and as such may be updated. Such instance time should
|
|
// not be filtered out by the nsSMILTimedElement even if they appear to be
|
|
// in the past as they may be updated to a future time.
|
|
kMayUpdate = 2,
|
|
|
|
// Indicates that this instance time was generated from the DOM as opposed
|
|
// to an nsSMILTimeValueSpec. When a 'begin' or 'end' attribute is set or
|
|
// reset we should clear all the instance times that have been generated by
|
|
// that attribute (and hence an nsSMILTimeValueSpec), but not those from the
|
|
// DOM.
|
|
kFromDOM = 4,
|
|
|
|
// Indicates that this instance time was used as the endpoint of an interval
|
|
// that has been filtered or removed. However, since it is a dynamic time it
|
|
// should be preserved and not filtered.
|
|
kWasDynamicEndpoint = 8
|
|
};
|
|
uint8_t mFlags; // Combination of kDynamic, kMayUpdate, etc.
|
|
mutable bool mVisited; // Cycle tracking
|
|
|
|
// Additional reference count to determine if this instance time is currently
|
|
// used as a fixed endpoint in any intervals. Instance times that are used in
|
|
// this way should not be removed when the owning nsSMILTimedElement removes
|
|
// instance times in response to a restart or in an attempt to free up memory
|
|
// by filtering out old instance times.
|
|
//
|
|
// Instance times are only shared in a few cases, namely:
|
|
// a) early ends,
|
|
// b) zero-duration intervals,
|
|
// c) momentarily whilst establishing new intervals and updating the current
|
|
// interval, and
|
|
// d) trimmed intervals
|
|
// Hence the limited range of a uint16_t should be more than adequate.
|
|
uint16_t mFixedEndpointRefCnt;
|
|
|
|
uint32_t mSerial; // A serial number used by the containing class to
|
|
// specify the sort order for instance times with the
|
|
// same mTime.
|
|
|
|
nsSMILTimeValueSpec* mCreator; // The nsSMILTimeValueSpec object that created
|
|
// us. (currently only needed for syncbase
|
|
// instance times.)
|
|
nsSMILInterval* mBaseInterval; // Interval from which this time is derived
|
|
// (only used for syncbase instance times)
|
|
};
|
|
|
|
#endif // NS_SMILINSTANCETIME_H_
|