4 cocos2dx 3.0 源码分析- scheduler
schedule(schedule_selector(HelloWorld::update), );
void Scheduler::schedule(SEL_SCHEDULE selector, Ref *target, float interval, unsigned int repeat, float delay, bool paused)
{
CCASSERT(target, "Argument target must be non-nullptr"); tHashTimerEntry *element = nullptr;
HASH_FIND_PTR(_hashForTimers, &target, element); if (! element)
{
element = (tHashTimerEntry *)calloc(sizeof(*element), );
element->target = target; HASH_ADD_PTR(_hashForTimers, target, element); // Is this the 1st element ? Then set the pause level to all the selectors of this target
element->paused = paused;
}
else
{
CCASSERT(element->paused == paused, "");
} if (element->timers == nullptr)
{
element->timers = ccArrayNew();
}
else
{
for (int i = ; i < element->timers->num; ++i)
{
TimerTargetSelector *timer = static_cast<TimerTargetSelector*>(element->timers->arr[i]); if (selector == timer->getSelector())
{
CCLOG("CCScheduler#scheduleSelector. Selector already scheduled. Updating interval from: %.4f to %.4f", timer->getInterval(), interval);
timer->setInterval(interval);
return;
}
}
ccArrayEnsureExtraCapacity(element->timers, );
} TimerTargetSelector *timer = new (std::nothrow) TimerTargetSelector();
timer->initWithSelector(this, selector, target, interval, repeat, delay);
ccArrayAppendObject(element->timers, timer);
timer->release();
}
typedef struct _hashSelectorEntry
{
ccArray *timers;
void *target;
int timerIndex;
Timer *currentTimer;
bool currentTimerSalvaged;
bool paused;
UT_hash_handle hh;
} tHashTimerEntry; timers 存放的是Timer 类型的对象,TimerTargetSelector 是Timer的子类,主要存放了selector, 及target class CC_DLL Timer : public Ref
{
protected:
Timer();
public:
/** get interval in seconds */
inline float getInterval() const { return _interval; };
/** set interval in seconds */
inline void setInterval(float interval) { _interval = interval; }; void setupTimerWithInterval(float seconds, unsigned int repeat, float delay); virtual void trigger() = ;
virtual void cancel() = ; /** triggers the timer */
void update(float dt); protected: Scheduler* _scheduler; // weak ref
float _elapsed;
bool _runForever;
bool _useDelay;
unsigned int _timesExecuted;
unsigned int _repeat; //0 = once, 1 is 2 x executed
float _delay;
float _interval;
}; class CC_DLL TimerTargetSelector : public Timer
{
public:
TimerTargetSelector(); bool initWithSelector(Scheduler* scheduler, SEL_SCHEDULE selector, Ref* target, float seconds, unsigned int repeat, float delay); inline SEL_SCHEDULE getSelector() const { return _selector; }; virtual void trigger() override;
virtual void cancel() override; protected:
Ref* _target;
SEL_SCHEDULE _selector;
};
Scheduler::update(dt) // main loop
void Scheduler::update(float dt)
{
_updateHashLocked = true; if (_timeScale != 1.0f)
{
dt *= _timeScale;
}
..
// Iterate over all the custom selectors
for (tHashTimerEntry *elt = _hashForTimers; elt != nullptr; )
{
_currentTarget = elt;
_currentTargetSalvaged = false; if (! _currentTarget->paused)
{
// The 'timers' array may change while inside this loop
for (elt->timerIndex = ; elt->timerIndex < elt->timers->num; ++(elt->timerIndex))
{
elt->currentTimer = (Timer*)(elt->timers->arr[elt->timerIndex]);
elt->currentTimerSalvaged = false; elt->currentTimer->update(dt); if (elt->currentTimerSalvaged)
{
// The currentTimer told the remove itself. To prevent the timer from
// accidentally deallocating itself before finishing its step, we retained
// it. Now that step is done, it's safe to release it.
elt->currentTimer->release();
} elt->currentTimer = nullptr;
}
} // elt, at this moment, is still valid
// so it is safe to ask this here (issue #490)
elt = (tHashTimerEntry *)elt->hh.next; // only delete currentTarget if no actions were scheduled during the cycle (issue #481)
if (_currentTargetSalvaged && _currentTarget->timers->num == )
{
removeHashElement(_currentTarget);
}
}
void TimerTargetSelector::trigger()
{
if (_target && _selector)
{
(_target->*_selector)(_elapsed);
}
} void Timer::update(float dt)
{
..
..
if (_runForever && !_useDelay)
{//standard timer usage
_elapsed += dt;
if (_elapsed >= _interval)
{
trigger(); _elapsed = ;
}
}
}
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