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135 lines
4.2 KiB
C++
135 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef NS_SMILTIMEVALUE_H_
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#define NS_SMILTIMEVALUE_H_
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#include "nsSMILTypes.h"
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#include "nsDebug.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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* nsSMILInstanceTime -- an nsSMILTimeValue used for constructing intervals. It
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* contains additional fields to govern reset behavior
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* and track timing dependencies (e.g. syncbase timing).
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* nsSMILInterval -- a pair of nsSMILInstanceTimes that defines a begin and
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* an end time for animation.
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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". Acts as
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* a broker between an nsSMILTimedElement and its
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* nsSMILInstanceTimes by generating new instance times
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* and handling changes to existing times.
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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 definite millisecond value
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* 2) The time is resolved and indefinite
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* 3) The time is unresolved
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*
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* In summary:
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*
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* State | GetMillis | IsDefinite | IsIndefinite | IsResolved
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* -----------+-----------------+------------+--------------+------------
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* Definite | nsSMILTimeValue | true | false | true
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* -----------+-----------------+------------+--------------+------------
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* Indefinite | -- | false | true | true
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* -----------+-----------------+------------+--------------+------------
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* Unresolved | -- | false | false | 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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: mMilliseconds(kUnresolvedMillis),
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mState(STATE_UNRESOLVED)
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{ }
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// Creates a resolved time value
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explicit nsSMILTimeValue(nsSMILTime aMillis)
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: mMilliseconds(aMillis),
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mState(STATE_DEFINITE)
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{ }
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// Named constructor to create an indefinite time value
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static nsSMILTimeValue Indefinite()
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{
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nsSMILTimeValue value;
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value.SetIndefinite();
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return value;
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}
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bool IsIndefinite() const { return mState == STATE_INDEFINITE; }
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void SetIndefinite()
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{
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mState = STATE_INDEFINITE;
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mMilliseconds = kUnresolvedMillis;
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}
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bool IsResolved() const { return mState != STATE_UNRESOLVED; }
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void SetUnresolved()
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{
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mState = STATE_UNRESOLVED;
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mMilliseconds = kUnresolvedMillis;
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}
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bool IsDefinite() const { return mState == STATE_DEFINITE; }
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nsSMILTime GetMillis() const
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{
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MOZ_ASSERT(mState == STATE_DEFINITE,
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"GetMillis() called for unresolved or indefinite time");
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return mState == STATE_DEFINITE ? mMilliseconds : kUnresolvedMillis;
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}
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void SetMillis(nsSMILTime aMillis)
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{
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mState = STATE_DEFINITE;
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mMilliseconds = aMillis;
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}
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int8_t CompareTo(const nsSMILTimeValue& aOther) const;
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bool operator==(const nsSMILTimeValue& aOther) const
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{ return CompareTo(aOther) == 0; }
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bool operator!=(const nsSMILTimeValue& aOther) const
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{ return CompareTo(aOther) != 0; }
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bool operator<(const nsSMILTimeValue& aOther) const
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{ return CompareTo(aOther) < 0; }
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bool operator>(const nsSMILTimeValue& aOther) const
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{ return CompareTo(aOther) > 0; }
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bool operator<=(const nsSMILTimeValue& aOther) const
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{ return CompareTo(aOther) <= 0; }
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bool operator>=(const nsSMILTimeValue& aOther) const
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{ return CompareTo(aOther) >= 0; }
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private:
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static nsSMILTime kUnresolvedMillis;
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nsSMILTime mMilliseconds;
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enum {
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STATE_DEFINITE,
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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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