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// vim: set tabstop=4 shiftwidth=4 noexpandtab
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/*
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Gwenview - A simple image viewer for KDE
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Copyright 2000-2004 Aur<EFBFBD>lien G<EFBFBD>teau
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "threadgate.moc"
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#include "tsthread/tsthread.h"
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namespace Gwenview {
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// The trick is simple. This object connects its slot to its signal, then
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// emits the signal using emitSignal(), and the slot gets called in the main
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// thread. In the main thread the slot does everything that should be done
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// in the main thread, and returns the data using the signal/slot reference
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// arguments. As the thread is blocked waiting on the signal to finish,
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// there's even no need to do any locking.
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ThreadGate::ThreadGate() {
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connect( this, SIGNAL( signalColor( QColor&, const char* )),
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this, SLOT( slotColor( QColor&, const char* )));
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}
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ThreadGate* ThreadGate::instance() {
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static ThreadGate gate;
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return &gate;
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}
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QColor ThreadGate::color( const char* name ) {
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if( name == NULL || name[ 0 ] == '\0' || name[ 0 ] == '#' )
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return QColor( name );
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// named color ... needs to be created in the main thread
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if( TSThread::currentThread() == TSThread::mainThread())
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return QColor( name );
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QColor col;
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TSThread::currentThread()->emitCancellableSignal( this, SIGNAL( signalColor( QColor&, const char* )), col, name );
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return col;
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}
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void ThreadGate::slotColor( QColor& col, const char* name ) {
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col = QColor( name );
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}
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} // namespace
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