bool StPlayList::remove(const StString& thePath,
const bool theToRemovePhysically) {
StString aPath = thePath;
StPlayItem* aRemItem = NULL;
StMutexAuto anAutoLock(myMutex);
if(myCurrent == NULL) {
// empty playlist
return false;
} else if(aPath != myCurrent->getPath()) {
// search play item
for(StPlayItem* anItem = myFirst; anItem != NULL; anItem = anItem->getNext()) {
if(aPath == anItem->getPath()) {
aRemItem = anItem;
break;
}
}
} else {
// walk to another playlist position
aRemItem = myCurrent;
const bool aPlayedFlag = aRemItem->getPlayedFlag();
if(myCurrent->hasNext()) {
myCurrent = myCurrent->getNext();
} else if(myCurrent->hasPrev()) {
myCurrent = myCurrent->getPrev();
} else {
myCurrent = NULL;
myPlayedCount = 0;
}
if(myCurrent != NULL) {
if(aRemItem->getPlayedFlag() != aPlayedFlag) {
// the item has not been played yet - mark it as such
aRemItem->setPlayedFlag(aPlayedFlag);
} else {
// one played item has been removed
--myPlayedCount;
}
}
}
// remove item itself
const bool isDeleted = aRemItem != NULL
&& (!theToRemovePhysically || StFileNode::removeFile(aPath));
if(isDeleted) {
delPlayItem(aRemItem);
delete aRemItem;
}
anAutoLock.unlock();
signals.onPlaylistChange();
return isDeleted;
}
bool StPlayList::walkToNext(const bool theToForce) {
StMutexAuto anAutoLock(myMutex);
if(myCurrent == NULL
|| (myToLoopSingle && !theToForce)) {
return false;
} else if(myIsShuffle && myItemsCount >= 3) {
StPlayItem* aPrev = myCurrent;
if(!myStackNext.empty()) {
myCurrent = myStackNext.front();
myStackNext.pop_front();
} else {
if((myPlayedCount >= (myItemsCount - 1)) || (myPlayedCount == 0)) {
// reset the playback counter
#ifdef _WIN32
FILETIME aTime;
GetSystemTimeAsFileTime(&aTime);
myRandGen.setSeed(aTime.dwLowDateTime);
#else
timeval aTime;
gettimeofday(&aTime, NULL);
myRandGen.setSeed(aTime.tv_usec);
#endif
myPlayedCount = 0;
myCurrent->setPlayedFlag(!myCurrent->getPlayedFlag());
ST_DEBUG_LOG("Restart the shuffle");
}
// determine next random position
const size_t aCurrPos = myCurrent->getPosition();
bool aCurrFlag = myCurrent->getPlayedFlag();
StPlayItem* aNextItem = myCurrent;
const size_t aNextPos = stMin(size_t(myRandGen.next() * myItemsCount), myItemsCount - 1);
if(aNextPos > aCurrPos) {
// forward direction
for(size_t aNextDiff = aNextPos - aCurrPos; aNextItem != NULL && aNextDiff != 0; --aNextDiff) {
aNextItem = aNextItem->getNext();
}
} else {
// backward direction
for(size_t aNextDiff = aCurrPos - aNextPos; aNextItem != NULL && aNextDiff != 0; --aNextDiff) {
aNextItem = aNextItem->getPrev();
}
}
if(aCurrFlag == aNextItem->getPlayedFlag()) {
// find nearest position not yet played - prefer item farther from current one
StPlayItem* aNextItem1 = aNextPos > aCurrPos ? aNextItem->getNext() : aNextItem->getPrev();
StPlayItem* aNextItem2 = aNextPos > aCurrPos ? aNextItem->getPrev() : aNextItem->getNext();
for(; aNextItem1 != NULL || aNextItem2 != NULL;) {
if(aNextItem1 != NULL) {
if(aCurrFlag != aNextItem1->getPlayedFlag()) {
aNextItem = aNextItem1;
break;
}
aNextItem1 = aNextPos > aCurrPos ? aNextItem1->getNext() : aNextItem1->getPrev();
}
if(aNextItem2 != NULL) {
if(aCurrFlag != aNextItem2->getPlayedFlag()) {
aNextItem = aNextItem2;
break;
}
aNextItem2 = aNextPos > aCurrPos ? aNextItem2->getPrev() : aNextItem2->getNext();
}
}
if(aCurrFlag == aNextItem->getPlayedFlag()) {
// something wrong!
ST_DEBUG_LOG("Disaster - next shuffle position not found!");
aCurrFlag = !aCurrFlag;
myPlayedCount = 0;
}
}
ST_DEBUG_LOG(aCurrPos + " -> " + aNextItem->getPosition());
++myPlayedCount;
aNextItem->setPlayedFlag(aCurrFlag);
myCurrent = aNextItem;
}
if(aPrev != myCurrent
&& aPrev != NULL) {
myStackPrev.push_back(aPrev);
if(myStackPrev.size() > THE_UNDO_LIMIT) {
myStackPrev.pop_front();
}
}
const size_t anItemId = myCurrent->getPosition();
anAutoLock.unlock();
signals.onPositionChange(anItemId);
return true;
} else if(myCurrent != myLast) {
myCurrent = myCurrent->getNext();
const size_t anItemId = myCurrent->getPosition();
anAutoLock.unlock();
signals.onPositionChange(anItemId);
return true;
} else if(myIsLoopFlag) {
return walkToFirst();
}
return false;
}
