--- /dev/null
+/*******************************************************************************\r
+ * Copyright (c) 2011 Association for Decentralized Information Management in\r
+ * Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ * VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.diagram.symbollibrary.ui;\r
+\r
+import org.simantics.diagram.symbollibrary.ISymbolGroup;\r
+import org.simantics.g2d.gallery.GalleryViewer;\r
+import org.simantics.scenegraph.g2d.events.Event;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public interface SymbolLibraryEventHandler {\r
+\r
+ /**\r
+ * @param event the event that occurred\r
+ * @param group the symbol group within which the event occurred or\r
+ * <code>null</code> if event occurred outside of an existing symbol\r
+ * group\r
+ * @param viewer the viewer of for the group or <code>null</code> if viewer\r
+ * is not yet initialized\r
+ * @return <code>true</code> if the handler consumes the event\r
+ */\r
+ boolean handleEvent(Event event, ISymbolGroup group, GalleryViewer viewer);\r
+\r
+}\r