X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.diagram%2Fsrc%2Forg%2Fsimantics%2Fdiagram%2Fhandler%2FExpandSelectionHandler.java;fp=bundles%2Forg.simantics.diagram%2Fsrc%2Forg%2Fsimantics%2Fdiagram%2Fhandler%2FExpandSelectionHandler.java;h=28a5dc14f225cb21b2e582aea3afd543630d8830;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/handler/ExpandSelectionHandler.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/handler/ExpandSelectionHandler.java
new file mode 100644
index 000000000..28a5dc14f
--- /dev/null
+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/handler/ExpandSelectionHandler.java
@@ -0,0 +1,79 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.diagram.handler;
+
+import java.util.Set;
+
+import org.eclipse.jface.action.IStatusLineManager;
+import org.eclipse.swt.widgets.Display;
+import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;
+import org.simantics.g2d.diagram.participant.AbstractDiagramParticipant;
+import org.simantics.g2d.diagram.participant.Selection;
+import org.simantics.g2d.element.IElement;
+import org.simantics.g2d.utils.TopologicalSelectionExpander;
+import org.simantics.scenegraph.g2d.events.EventHandlerReflection.EventHandler;
+import org.simantics.scenegraph.g2d.events.command.CommandEvent;
+import org.simantics.scenegraph.g2d.events.command.Commands;
+
+/**
+ * This handler responds to the EXPAND_SELECTION command. It attempts to expand
+ * the current selection for pointer 0, meaning {@link Selection#SELECTION0}.
+ * 
+ * @see TopologicalSelectionExpander
+ * @see Selection the current diagram selection source
+ * 
+ * @author Tuukka Lehtonen
+ */
+public class ExpandSelectionHandler extends AbstractDiagramParticipant {
+
+	private final IStatusLineManager statusLine;
+	
+    @Dependency Selection selection;
+
+    public ExpandSelectionHandler(IStatusLineManager statusLine) {
+    	this.statusLine = statusLine;
+    }
+    
+    @EventHandler(priority = 0)
+    public boolean handleExpand(CommandEvent event) {
+        if (Commands.EXPAND_SELECTION.equals( event.command )) {
+            return expandSelection(0);
+        }
+        return false;
+    }
+
+    /**
+     * @param selectionId the id of the selection to expand
+     * @return <code>true</code> if the selection changed as a result of the
+     *         expansion, <code>false</code> if not
+     */
+    public boolean expandSelection(int selectionId) {
+        Set<IElement> start = selection.getSelection(selectionId);
+        TopologicalSelectionExpander expander = new TopologicalSelectionExpander(diagram, start);
+        final Set<IElement> expanded = expander.expandedIfChanged();
+        if (expanded == null)
+            return false;
+        selection.setSelection(selectionId, expanded);
+        if(statusLine != null) {
+        	Display.getDefault().asyncExec(new Runnable() {
+
+				@Override
+				public void run() {
+		        	statusLine.setMessage("Expanded selection to include " + expanded.size() + " (from " + diagram.getElements().size() + ") items.");
+				}
+        		
+        	});
+        }
+        return true;
+    }
+
+}