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132 lines
5.0 KiB
C++
132 lines
5.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Mozilla SMIL module.
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*
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* The Initial Developer of the Original Code is Brian Birtles.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Brian Birtles <birtles@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef NS_SMILTIMEVALUE_H_
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#define NS_SMILTIMEVALUE_H_
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#include "prtypes.h"
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#include "prlong.h"
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#include "nsSMILTypes.h"
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/*----------------------------------------------------------------------
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* nsSMILTimeValue class
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*
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* A tri-state time value.
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*
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* First a quick overview of the SMIL time data types:
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*
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* nsSMILTime -- a timestamp in milliseconds.
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* nsSMILTimeValue -- (this class) a timestamp that can take the additional
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* states 'indefinite' and 'unresolved'
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* nsSMILInterval -- a pair of nsSMILTimeValues that defines a begin and an
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* end point.
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* nsSMILInstanceTime -- an nsSMILTimeValue used for constructing intervals. It
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* contains additional fields to govern reset behavior.
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* It also forms an anchor for establishing syncbase
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* relationships.
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* nsSMILTimeValueSpec -- a component of a begin or end attribute, such as the
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* '5s' or 'a.end+2m' in begin="5s; a.end+2m". These
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* objects produce nsSMILInstanceTimes and are also used
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* in managing dependent relationships between
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* animations.
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*
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* Objects of this class may be in one of three states:
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*
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* 1) The time is resolved and has a millisecond value
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* 2) The time is indefinite
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* 3) The time in unresolved
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*
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* There is considerable chance for confusion with regards to the indefinite
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* state. Is it resolved? We adopt the convention that it is NOT resolved (but
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* nor is it unresolved). This simplifies implementation as you can then write:
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*
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* if (time.IsResolved())
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* x = time.GetMillis()
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*
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* instead of:
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*
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* if (time.IsResolved() && !time.IsIndefinite())
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* x = time.GetMillis()
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*
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* Testing if a time is unresolved becomes more complicated but this is tested
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* much less often.
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*
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* In summary:
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*
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* State | GetMillis | IsResolved | IsIndefinite
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* --------------+--------------------+--------------------+-------------------
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* Resolved | The millisecond | PR_TRUE | PR_FALSE
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* | time | |
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* --------------+--------------------+--------------------+-------------------
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* Indefinite | LL_MAXINT | PR_FALSE | PR_TRUE
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* --------------+--------------------+--------------------+-------------------
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* Unresolved | LL_MAXINT | PR_FALSE | PR_FALSE
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*
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*/
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class nsSMILTimeValue
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{
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public:
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// Creates an unresolved time value
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nsSMILTimeValue();
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PRBool IsIndefinite() const { return mState == STATE_INDEFINITE; }
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void SetIndefinite();
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PRBool IsResolved() const { return mState == STATE_RESOLVED; }
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void SetUnresolved();
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nsSMILTime GetMillis() const;
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void SetMillis(nsSMILTime aMillis);
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PRInt8 CompareTo(const nsSMILTimeValue& aOther) const;
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private:
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PRInt8 Cmp(PRInt64 aA, PRInt64 aB) const;
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static nsSMILTime kUnresolvedSeconds;
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nsSMILTime mMilliseconds;
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enum {
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STATE_RESOLVED,
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STATE_INDEFINITE,
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STATE_UNRESOLVED
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} mState;
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};
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#endif // NS_SMILTIMEVALUE_H_
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