1 files changed, 60 insertions, 0 deletions

diff --git a/src/gvcore/threadgate.cpp b/src/gvcore/threadgate.cpp
new file mode 100644
index 0000000..3d09b9f
--- /dev/null
+++ b/src/gvcore/threadgate.cpp
@@ -0,0 +1,60 @@
+// vim: set tabstop=4 shiftwidth=4 noexpandtab
+/*
+Gwenview - A simple image viewer for KDE
+Copyright 2000-2004 Aurélien Gâteau
+ 
+ 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