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diff --git a/src/sources/triggeredsource.h b/src/sources/triggeredsource.h
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+/***************************************************************************
+ *   Copyright (C) 2007 by Ken Werner                                      *
+ *   ken.werner@web.de                                                     *
+ *                                                                         *
+ *   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.             *
+ ***************************************************************************/
+
+#ifndef TRIGGEREDSOURCE_H
+#define TRIGGEREDSOURCE_H
+
+#include "source.h"
+#include <qevent.h> 
+
+/**
+ * TriggeredSource provides fetchValue and 
+ * can be triggered asynchronously by ThreadedTrigger
+ * @author Ken Werner
+ */
+class TriggeredSource : public Source{
+	Q_OBJECT //macro which activates signals and slots (moc)
+public:
+	/**
+	 * Creates a new TriggeredSource
+	 */
+	TriggeredSource(QWidget* inParent);
+	
+	virtual ~TriggeredSource();
+
+public slots:
+
+	/**
+	 * Returns the formatted value of this source
+	 */
+	virtual QString getValue() const;
+
+	/**
+	 * Fetches and returns the value of this source
+	 * This method might be called from a thread so don't call it directly
+	 */
+	virtual QString fetchValue() = 0;
+
+signals:
+	/**
+	 * This signal is emitted whenever the value of this source (mValue) is updated
+	 */
+	void valueUpdated(const QString& inValue);
+
+protected:
+    /**
+     * consumes the UpdateEvent 
+     */
+    virtual void customEvent(QCustomEvent* event);
+	
+	/**
+	 * the buffered value of this source
+	 */
+	QString mValue;
+};
+#endif //TRIGGEREDSOURCE_H