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/**
* Copyright (C) 1997-2003 the KGhostView authors. See file AUTHORS.
*
* 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.
*/
#include "thumbnailservice.h"
#include "kgv_miniwidget.h"
#include "kpswidget.h"
#include "kgv_view.h"
#include <kdebug.h>
#include <qtimer.h>
#include <algorithm>
#include <cassert>
#include <cstring>
ThumbnailService::ThumbnailService( KGVMiniWidget* parent, const char* name ) :
QObject( parent, name ),
_mini( parent ),
timer_( new QTimer( this ) ),
_busy( false ),
_enabled( false )
{
_thumbnailDrawer = new KPSWidget( parent->_part->widget(), "thumbnail-drawer" );
_thumbnailDrawer->readSettings();
connect( _thumbnailDrawer, SIGNAL( newPageImage( QPixmap ) ), SLOT( slotDone( QPixmap ) ) );
connect( timer_, SIGNAL( timeout() ), SLOT( processOne() ) );
_thumbnailDrawer->hide();
}
ThumbnailService::~ThumbnailService()
{
}
bool ThumbnailService::Request::operator < ( ThumbnailService::Request b ) const
{
if ( urgent != b.urgent ) return urgent;
if ( page != b.page ) return page < b.page;
// below is just so that == can be in terms of "<"
if ( receiver != b.receiver ) return std::less<QObject*>()( receiver, b.receiver );
if ( slot != b.slot ) return std::strcmp( slot, b.slot ) < 0;
return false;
}
void ThumbnailService::delayedGetThumbnail( const int page, QObject* rec, const char* slot, bool urgent )
{
kdDebug( 4500 ) << "ThumbnailService::delayedGetThumbnail: request for page " << page << endl;
pending.insert( Request( page, rec, slot, urgent ) );
if ( !_busy ) {
_busy = true;
// The reason for the code below might not be obvious:
// It is much nicer to have the the thumbnails appear from top to bottom.
// However, when several are requested at once (or almost), then we cannot control the order
// unless we delay a bit the first one
if ( urgent ) processOne();
else timer_->start( 150, true );
}
}
void ThumbnailService::cancelRequests( const int page, QObject* rec, const char* slot )
{
std::set<Request>::iterator first = pending.begin(), last = pending.end();
while ( first != last ) {
if ( ( page == -1 || page == first->page ) &&
( !rec || rec == first->receiver ) &&
( !slot || !strcmp( slot, first->slot ) ) ) {
std::set<Request>::iterator next = first;
++next;
pending.erase( first );
first = next;
} else {
++first;
}
}
}
void ThumbnailService::reset()
{
kdDebug( 4500 ) << "ThumbnailService::reset()" << endl;
timer_->stop();
pending.clear();
assert( _thumbnailDrawer );
_thumbnailDrawer->stopInterpreter();
_busy = false;
_enabled = false;
}
void ThumbnailService::setEnabled( const bool e )
{
kdDebug( 4500 ) << "ThumbnailService::setEnabled( " << ( e ? "true" : "false" ) << " )" << endl;
_enabled = e;
if ( _enabled && _busy ) processOne();
}
void ThumbnailService::slotDone( QPixmap pix )
{
kdDebug( 4500 ) << "ThumbnailService::slotDone(): got page" << endl;
pix.detach();
emit relayPixmap( pix );
processOne();
}
void ThumbnailService::processOne()
{
kdDebug( 4500 ) << "ThumbnailService::processOne()" << endl;
if ( !_enabled ) return;
if ( !_mini || !_mini->dsc() || !_mini->dsc()->isStructured() ) {
_busy = false;
pending.clear();
return;
}
assert( _thumbnailDrawer );
if ( pending.empty() ) {
_busy = false;
return;
}
_busy = true;
FILE* file = _mini->psFile();
Request req = *pending.begin();
kdDebug( 4500 ) << "ThumbnailService::processOne(): processing " << req.page << "(of " << pending.size() << " requests)" << endl;
disconnect( SIGNAL( relayPixmap( QPixmap ) ) );
while ( !pending.empty() && req.page == pending.begin()->page ) {
req = *pending.begin();
connect( this, SIGNAL( relayPixmap( QPixmap ) ), req.receiver, req.slot );
pending.erase( pending.begin() );
}
_thumbnailDrawer->setOrientation( _mini->orientation( req.page ) );
_thumbnailDrawer->setBoundingBox( _mini->boundingBox( req.page ) );
_thumbnailDrawer->setMagnification( 0.2 );
if ( !_thumbnailDrawer->isInterpreterRunning() ) {
_thumbnailDrawer->setFileName( _mini->_document->fileName(), true );
_thumbnailDrawer->startInterpreter();
_thumbnailDrawer->sendPS( file, _mini->dsc()->beginprolog(),
_mini->dsc()->endprolog() );
_thumbnailDrawer->sendPS( file, _mini->dsc()->beginsetup(),
_mini->dsc()->endsetup() );
}
else {
_thumbnailDrawer->nextPage();
}
_thumbnailDrawer->sendPS( file, _mini->dsc()->page()[ req.page ].begin,
_mini->dsc()->page()[ req.page ].end );
}
#include "thumbnailservice.moc"
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