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// vim: set tabstop=4 shiftwidth=4 noexpandtab
/*
Gwenview - A simple image viewer for KDE
Copyright 2000-2004 Aur�lien G�teau
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "threadgate.moc"
#include "tsthread/tsthread.h"
namespace Gwenview {
// The trick is simple. This object connects its slot to its signal, then
// emits the signal using emitSignal(), and the slot gets called in the main
// thread. In the main thread the slot does everything that should be done
// in the main thread, and returns the data using the signal/slot reference
// arguments. As the thread is blocked waiting on the signal to finish,
// there's even no need to do any locking.
ThreadGate::ThreadGate() {
connect( this, SIGNAL( signalColor( QColor&, const char* )),
this, SLOT( slotColor( QColor&, const char* )));
}
ThreadGate* ThreadGate::instance() {
static ThreadGate gate;
return &gate;
}
QColor ThreadGate::color( const char* name ) {
if( name == NULL || name[ 0 ] == '\0' || name[ 0 ] == '#' )
return QColor( name );
// named color ... needs to be created in the main thread
if( TSThread::currentThread() == TSThread::mainThread())
return QColor( name );
QColor col;
TSThread::currentThread()->emitCancellableSignal( this, SIGNAL( signalColor( QColor&, const char* )), col, name );
return col;
}
void ThreadGate::slotColor( QColor& col, const char* name ) {
col = QColor( name );
}
} // namespace
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