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/*
Gwenview - A simple image viewer for TDE
Copyright 2000-2004 Aur�ien G�eau
This program 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; either version 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
// STL
#include <algorithm>
// TQt
#include <tqtimer.h>
// KDE
#include <tdeconfig.h>
#include <kdebug.h>
// Local
#include <../gvcore/slideshowconfig.h>
#include "slideshow.moc"
#include "document.h"
#include "imageloader.h"
#include "cache.h"
namespace Gwenview {
#undef ENABLE_LOG
#undef LOG
//#define ENABLE_LOG
#ifdef ENABLE_LOG
#define LOG(x) kdDebug() << k_funcinfo << x << endl
#else
#define LOG(x) ;
#endif
SlideShow::SlideShow(Document* document)
: mDocument(document), mStarted(false), mPrefetch( NULL ) {
mTimer=new TQTimer(this);
connect(mTimer, TQT_SIGNAL(timeout()),
this, TQT_SLOT(slotTimeout()) );
connect(mDocument, TQT_SIGNAL(loaded(const KURL&)),
this, TQT_SLOT(slotLoaded()) );
}
SlideShow::~SlideShow() {
if( !mPriorityURL.isEmpty()) Cache::instance()->setPriorityURL( mPriorityURL, false );
}
void SlideShow::slotSettingsChanged() {
if (mTimer->isActive()) {
mTimer->changeInterval(timerInterval());
}
}
int SlideShow::timerInterval() {
int documentDuration = mDocument->duration();
if (documentDuration != 0) {
return documentDuration * 1000;
} else {
return int(SlideShowConfig::delay()*1000);
}
}
void SlideShow::start(const KURL::List& urls) {
mURLs.resize(urls.size());
tqCopy(urls.begin(), urls.end(), mURLs.begin());
if (SlideShowConfig::random()) {
std::random_shuffle(mURLs.begin(), mURLs.end());
}
mStartIt=tqFind(mURLs.begin(), mURLs.end(), mDocument->url());
if (mStartIt==mURLs.end()) {
kdWarning() << k_funcinfo << "Current URL not found in list, aborting.\n";
return;
}
mTimer->start(timerInterval(), true);
mStarted=true;
prefetch();
emit stateChanged(true);
}
void SlideShow::stop() {
mTimer->stop();
mStarted=false;
emit stateChanged(false);
if( !mPriorityURL.isEmpty()) {
Cache::instance()->setPriorityURL( mPriorityURL, false );
mPriorityURL = KURL();
}
}
TQValueVector<KURL>::ConstIterator SlideShow::findNextURL() const {
TQValueVector<KURL>::ConstIterator it=tqFind(mURLs.begin(), mURLs.end(), mDocument->url());
if (it==mURLs.end()) {
kdWarning() << k_funcinfo << "Current URL not found in list. This should not happen.\n";
return it;
}
++it;
if (SlideShowConfig::loop()) {
// Looping, if we reach the end, start again
if (it==mURLs.end()) {
it = mURLs.begin();
}
} else {
// Not looping, have we reached the end?
if ((it==mURLs.end() && SlideShowConfig::stopAtEnd()) || it==mStartIt) {
it = mURLs.end();
}
}
return it;
}
void SlideShow::slotTimeout() {
LOG("");
// wait for prefetching to finish
if( mPrefetch != NULL ) {
LOG("mPrefetch is working");
return;
}
TQValueVector<KURL>::ConstIterator it=findNextURL();
if (it==mURLs.end()) {
stop();
return;
}
emit nextURL(*it);
}
void SlideShow::slotLoaded() {
if (mStarted) {
mTimer->start(timerInterval(), true);
prefetch();
}
}
void SlideShow::prefetch() {
LOG("");
TQValueVector<KURL>::ConstIterator it=findNextURL();
if (it==mURLs.end()) {
return;
}
LOG("url=" << (*it).pathOrURL());
if( mPrefetch != NULL ) mPrefetch->release( this );
// TODO don't use prefetching with disabled optimizations (and add that option ;) )
// (and also don't use prefetching in other places if the image won't fit in cache)
mPrefetch = ImageLoader::loader( *it, this, BUSY_PRELOADING );
if( !mPriorityURL.isEmpty()) Cache::instance()->setPriorityURL( mPriorityURL, false );
mPriorityURL = *it;
Cache::instance()->setPriorityURL( mPriorityURL, true ); // make sure it will stay in the cache
connect( mPrefetch, TQT_SIGNAL( urlKindDetermined()), TQT_SLOT( slotUrlKindDetermined()));
connect( mPrefetch, TQT_SIGNAL( imageLoaded( bool )), TQT_SLOT( prefetchDone()));
if (mPrefetch->urlKind()==MimeTypeUtils::KIND_FILE) {
// Prefetch is already done, and this is not a raster image
prefetchDone();
}
}
void SlideShow::slotUrlKindDetermined() {
LOG("");
if (!mPrefetch) return;
LOG("mPrefetch!=0");
if (mPrefetch->urlKind()==MimeTypeUtils::KIND_FILE) {
LOG("KIND_FILE");
// This is not a raster image, imageLoaded will not be emitted
prefetchDone();
}
}
void SlideShow::prefetchDone() {
LOG("");
if( mPrefetch != NULL ) {
LOG("mPrefetch!=0");
// don't call Cache::setPriorityURL( ... , false ) here - it will still take
// a short while to reuse the image from the cache
mPrefetch->release( this );
mPrefetch = NULL;
// prefetching completed and delay has already elapsed
if( mStarted && !mTimer->isActive()) {
LOG("Calling slotTimeout");
slotTimeout();
}
}
}
} // namespace
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