content/smil/nsSMILInterval.h
author David Anderson <danderson@mozilla.com>
Wed, 05 Oct 2011 19:52:55 -0700
changeset 111527 8cfeba5239a9e4f20c462d6fb20421b4e4e7c735
parent 111524 cad26d2fb5af799dfe030fd2a8948d617eac2f52
child 111565 f93960a93ad97a56d308bd9ce25d97cbc175d524
permissions -rw-r--r--
Merge to eliminate bad head.

/* -*- 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
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 * under the terms of either the GPL or the LGPL, and not to allow others to
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 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** 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 Unlink(bool aFiltered = 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();

  typedef nsTArray<nsRefPtr<nsSMILInstanceTime> > InstanceTimeList;

  void AddDependentTime(nsSMILInstanceTime& aTime);
  void RemoveDependentTime(const nsSMILInstanceTime& aTime);
  void GetDependentTimes(InstanceTimeList& aTimes);

  // Cue for assessing if this interval can be filtered
  bool IsDependencyChainLink() const;

private:
  nsRefPtr<nsSMILInstanceTime> mBegin;
  nsRefPtr<nsSMILInstanceTime> mEnd;

  // 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.
  bool mBeginFixed;
  bool mEndFixed;
};

#endif // NS_SMILINTERVAL_H_