gecko-dev/content/smil/nsSMILInterval.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Mozilla SMIL module.
*
* The Initial Developer of the Original Code is Brian Birtles.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Brian Birtles <birtles@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef NS_SMILINTERVAL_H_
#define NS_SMILINTERVAL_H_
#include "nsSMILInstanceTime.h"
#include "nsTArray.h"
//----------------------------------------------------------------------
// nsSMILInterval class
//
// A structure consisting of a begin and end time. The begin time must be
// resolved (i.e. not indefinite or unresolved).
//
// For an overview of how this class is related to other SMIL time classes see
// the documentation in nsSMILTimeValue.h
class nsSMILInterval
{
public:
nsSMILInterval();
nsSMILInterval(const nsSMILInterval& aOther);
~nsSMILInterval();
void NotifyChanged(const nsSMILTimeContainer* aContainer);
void Unlink(PRBool aFiltered = PR_FALSE);
const nsSMILInstanceTime* Begin() const
{
NS_ABORT_IF_FALSE(mBegin && mEnd,
"Requesting Begin() on un-initialized instance time");
return mBegin;
}
nsSMILInstanceTime* Begin();
const nsSMILInstanceTime* End() const
{
NS_ABORT_IF_FALSE(mBegin && mEnd,
"Requesting End() on un-initialized instance time");
return mEnd;
}
nsSMILInstanceTime* End();
void SetBegin(nsSMILInstanceTime& aBegin);
void SetEnd(nsSMILInstanceTime& aEnd);
void Set(nsSMILInstanceTime& aBegin, nsSMILInstanceTime& aEnd)
{
SetBegin(aBegin);
SetEnd(aEnd);
}
void FixBegin();
void FixEnd();
void AddDependentTime(nsSMILInstanceTime& aTime);
void RemoveDependentTime(const nsSMILInstanceTime& aTime);
// Cue for assessing if this interval can be filtered
PRBool IsDependencyChainLink() const;
private:
nsRefPtr<nsSMILInstanceTime> mBegin;
nsRefPtr<nsSMILInstanceTime> mEnd;
typedef nsTArray<nsRefPtr<nsSMILInstanceTime> > InstanceTimeList;
// nsSMILInstanceTimes to notify when this interval is changed or deleted.
InstanceTimeList mDependentTimes;
// Indicates if the end points of the interval are fixed or not.
//
// Note that this is not the same as having an end point whose TIME is fixed
// (i.e. nsSMILInstanceTime::IsFixed() returns PR_TRUE). This is because it is
// possible to have an end point with a fixed TIME and yet still update the
// end point to refer to a different nsSMILInstanceTime object.
//
// However, if mBegin/EndFixed is PR_TRUE, then BOTH the nsSMILInstanceTime
// OBJECT returned for that end point and its TIME value will not change.
PRPackedBool mBeginFixed;
PRPackedBool mEndFixed;
// When change notifications are passed around the timing model we try to
// filter out all changes where there is no observable difference to an
// instance time. Changes that may produce an observable difference are:
//
// * Changes to the time of an interval endpoint
// * Changes in the relative times of different time containers
// * Changes to the dependency chain (which may affect the animation sandwich)
//
// The nsSMILTimeValueSpec can detect the first two changes by recalculating
// the time but in order to help detect the third change we simply set a flag
// whenever the mBegin or mEnd pointers are changed. These flags are reset
// when the next change notification is sent.
PRPackedBool mBeginObjectChanged;
PRPackedBool mEndObjectChanged;
};
#endif // NS_SMILINTERVAL_H_