66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
/* $Id$ */
|
|
|
|
/*
|
|
* This file is part of OpenTTD.
|
|
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
|
|
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/** @file guitimer_func.h GUI Timers. */
|
|
|
|
#ifndef GUITIMER_FUNC_H
|
|
#define GUITIMER_FUNC_H
|
|
|
|
class GUITimer
|
|
{
|
|
protected:
|
|
uint timer;
|
|
uint interval;
|
|
|
|
public:
|
|
GUITimer() : timer(0), interval(0) { }
|
|
explicit GUITimer(uint interval) : timer(0), interval(interval) { }
|
|
|
|
inline bool HasElapsed() const
|
|
{
|
|
return this->interval == 0;
|
|
}
|
|
|
|
inline void SetInterval(uint interval)
|
|
{
|
|
this->timer = 0;
|
|
this->interval = interval;
|
|
}
|
|
|
|
/**
|
|
* Count how many times the interval has elapsed.
|
|
* Use to ensure a specific amount of events happen within a timeframe, e.g. for animation.
|
|
* @param delta Time since last test.
|
|
* @return Number of times the interval has elapsed.
|
|
*/
|
|
inline uint CountElapsed(uint delta)
|
|
{
|
|
if (this->interval == 0) return 0;
|
|
uint count = delta / this->interval;
|
|
if (this->timer + (delta % this->interval) >= this->interval) count++;
|
|
this->timer = (this->timer + delta) % this->interval;
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* Test if a timer has elapsed.
|
|
* Use to ensure an event happens only once within a timeframe, e.g. for window updates.
|
|
* @param delta Time since last test.
|
|
* @return True iff the timer has elapsed.
|
|
*/
|
|
inline bool Elapsed(uint delta)
|
|
{
|
|
if (this->CountElapsed(delta) == 0) return false;
|
|
this->SetInterval(0);
|
|
return true;
|
|
}
|
|
};
|
|
|
|
#endif /* GUITIMER_FUNC_H */
|