--- /dev/null
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in 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.handler;\r
+\r
+import java.util.Set;\r
+\r
+import org.eclipse.jface.action.IStatusLineManager;\r
+import org.eclipse.swt.widgets.Display;\r
+import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;\r
+import org.simantics.g2d.diagram.participant.AbstractDiagramParticipant;\r
+import org.simantics.g2d.diagram.participant.Selection;\r
+import org.simantics.g2d.element.IElement;\r
+import org.simantics.g2d.utils.TopologicalSelectionExpander;\r
+import org.simantics.scenegraph.g2d.events.EventHandlerReflection.EventHandler;\r
+import org.simantics.scenegraph.g2d.events.command.CommandEvent;\r
+import org.simantics.scenegraph.g2d.events.command.Commands;\r
+\r
+/**\r
+ * This handler responds to the EXPAND_SELECTION command. It attempts to expand\r
+ * the current selection for pointer 0, meaning {@link Selection#SELECTION0}.\r
+ * \r
+ * @see TopologicalSelectionExpander\r
+ * @see Selection the current diagram selection source\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class ExpandSelectionHandler extends AbstractDiagramParticipant {\r
+\r
+ private final IStatusLineManager statusLine;\r
+ \r
+ @Dependency Selection selection;\r
+\r
+ public ExpandSelectionHandler(IStatusLineManager statusLine) {\r
+ this.statusLine = statusLine;\r
+ }\r
+ \r
+ @EventHandler(priority = 0)\r
+ public boolean handleExpand(CommandEvent event) {\r
+ if (Commands.EXPAND_SELECTION.equals( event.command )) {\r
+ return expandSelection(0);\r
+ }\r
+ return false;\r
+ }\r
+\r
+ /**\r
+ * @param selectionId the id of the selection to expand\r
+ * @return <code>true</code> if the selection changed as a result of the\r
+ * expansion, <code>false</code> if not\r
+ */\r
+ public boolean expandSelection(int selectionId) {\r
+ Set<IElement> start = selection.getSelection(selectionId);\r
+ TopologicalSelectionExpander expander = new TopologicalSelectionExpander(diagram, start);\r
+ final Set<IElement> expanded = expander.expandedIfChanged();\r
+ if (expanded == null)\r
+ return false;\r
+ selection.setSelection(selectionId, expanded);\r
+ if(statusLine != null) {\r
+ Display.getDefault().asyncExec(new Runnable() {\r
+\r
+ @Override\r
+ public void run() {\r
+ statusLine.setMessage("Expanded selection to include " + expanded.size() + " (from " + diagram.getElements().size() + ") items.");\r
+ }\r
+ \r
+ });\r
+ }\r
+ return true;\r
+ }\r
+\r
+}\r