void CCScheduler::update(float dt)
{
m_bUpdateHashLocked = true;
// 预处理
if (m_fTimeScale != 1.0f)
{
dt *= m_fTimeScale;
}
// 枚举所有的update定时器
tListEntry *pEntry, *pTmp;
CCScriptEngineProtocol* pEngine = CCScriptEngineManager::sharedManager()->getScriptEngine();
// 优先级小于0的定时器
DL_FOREACH_SAFE(m_pUpdatesNegList, pEntry, pTmp)
{
if ((! pEntry->paused) && (! pEntry->markedForDeletion))
{
if (pEngine != NULL && kScriptTypeJavascript == pEngine->getScriptType())
{
pEngine->executeSchedule(0, dt, (CCNode *)pEntry->target);
}
pEntry->target->update(dt);
}
}
// 优先级等于0的定时器
DL_FOREACH_SAFE(m_pUpdates0List, pEntry, pTmp)
{
if ((! pEntry->paused) && (! pEntry->markedForDeletion))
{
if (pEngine != NULL && kScriptTypeJavascript == pEngine->getScriptType())
{
pEngine->executeSchedule(0, dt, (CCNode *)pEntry->target);
}
pEntry->target->update(dt);
}
}
// 优先级大于0的定时器
DL_FOREACH_SAFE(m_pUpdatesPosList, pEntry, pTmp)
{
if ((! pEntry->paused) && (! pEntry->markedForDeletion))
{
if (pEngine != NULL && kScriptTypeJavascript == pEngine->getScriptType())
{
pEngine->executeSchedule(0, dt, (CCNode *)pEntry->target);
}
pEntry->target->update(dt);
}
}
// 枚举所有的普通定时器
for (tHashTimerEntry *elt = m_pHashForTimers; elt != NULL; )
{
m_pCurrentTarget = elt;
m_bCurrentTargetSalvaged = false;
if (! m_pCurrentTarget->paused)
{
//枚举此节点中的计时器
// timers数组可能在循环中改变 需要格外小心
for (elt->timerIndex = 0; elt->timerIndex < elt->timers->num; ++(elt->timerIndex))
{
elt->currentTimer = (CCTimer*)(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 = NULL;
}
}
// 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 (m_bCurrentTargetSalvaged && m_pCurrentTarget->timers->num == 0)
{
removeHashElement(m_pCurrentTarget);
}
}
// 处理脚本引擎的相关事宜
if (m_pScriptHandlerEntries)
{
for (int i = m_pScriptHandlerEntries->count() - 1; i >= 0; i--)
{
CCSchedulerScriptHandlerEntry* pEntry = static_cast<CCSchedulerScriptHandlerEntry*>(m_pScriptHandlerEntries->objectAtIndex(i));
if (pEntry->isMarkedForDeletion())
{
m_pScriptHandlerEntries->removeObjectAtIndex(i);
}
else if (!pEntry->isPaused())
{
pEntry->getTimer()->update(dt);
}
}
}
// 清理所有的被标记了删除记号的update方法
// 优先级小于0的定时器
DL_FOREACH_SAFE(m_pUpdatesNegList, pEntry, pTmp)
{
if (pEntry->markedForDeletion)
{
this->removeUpdateFromHash(pEntry);
}
}
// 优先级等于0的定时器
DL_FOREACH_SAFE(m_pUpdates0List, pEntry, pTmp)
{
if (pEntry->markedForDeletion)
{
this->removeUpdateFromHash(pEntry);
}
}
// 优先级大于0的定时器
DL_FOREACH_SAFE(m_pUpdatesPosList, pEntry, pTmp)
{
if (pEntry->markedForDeletion)
{
this->removeUpdateFromHash(pEntry);
}
}
m_bUpdateHashLocked = false;
m_pCurrentTarget = NULL;
}