bundles/org.simantics.diagram/src/org/simantics/diagram/handler/CanvasCommandDelegate.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.diagram.handler;\r
  13 \r
  14 import org.eclipse.core.commands.AbstractHandler;\r
  15 import org.eclipse.core.commands.ExecutionEvent;\r
  16 import org.eclipse.core.commands.ExecutionException;\r
  17 import org.eclipse.swt.widgets.Event;\r
  18 import org.eclipse.ui.IWorkbenchPart;\r
  19 import org.eclipse.ui.handlers.HandlerUtil;\r
  20 import org.simantics.g2d.canvas.ICanvasContext;\r
  21 import org.simantics.g2d.chassis.ICanvasChassis;\r
  22 import org.simantics.scenegraph.g2d.events.EventDebugPolicy;\r
  23 import org.simantics.scenegraph.g2d.events.EventQueue;\r
  24 import org.simantics.scenegraph.g2d.events.command.Command;\r
  25 import org.simantics.scenegraph.g2d.events.command.CommandEvent;\r
  26 \r
  27 /**\r
  28  * A handler for the Eclipse Command framework that delegates ID of the command\r
  29  * that triggered the event to the {@link EventQueue} of the\r
  30  * {@link ICanvasContext} where the event occurred.\r
  31  */\r
  32 public class CanvasCommandDelegate extends AbstractHandler {\r
  33 \r
  34     private final boolean DEBUG = EventDebugPolicy.CANVAS_COMMAND_DELEGATION;\r
  35 \r
  36     @Override\r
  37     public Object execute(ExecutionEvent event) throws ExecutionException {\r
  38         Event e = ((Event)event.getTrigger());\r
  39         CommandEvent ce = new CommandEvent(null, e.time, new Command(event.getCommand().getId()));\r
  40 \r
  41         if (DEBUG)\r
  42             System.out.println(getClass().getSimpleName() + ": trigger event = " + e + " for command " + ce.command);\r
  43 \r
  44         if (e.widget instanceof ICanvasChassis) {\r
  45             ICanvasChassis chassis = (ICanvasChassis) e.widget;\r
  46             ICanvasContext canvas = chassis.getCanvasContext();\r
  47             if (canvas != null) {\r
  48                 if (DEBUG)\r
  49                     System.out.println(getClass().getSimpleName() + ": sending command " + event.getCommand().getId() + " to " + chassis);\r
  50                 canvas.getEventQueue().queueEvent( ce );\r
  51             }\r
  52         } else {\r
  53             ICanvasContext canvas = null;\r
  54             IWorkbenchPart part = HandlerUtil.getActiveEditor(event);\r
  55             if (part != null)\r
  56                 canvas = (ICanvasContext) part.getAdapter(ICanvasContext.class);\r
  57             if (canvas == null) {\r
  58                 part = HandlerUtil.getActivePart(event);\r
  59                 if (part != null)\r
  60                     canvas = (ICanvasContext) part.getAdapter(ICanvasContext.class);\r
  61             }\r
  62             if (canvas != null) {\r
  63                 if (DEBUG)\r
  64                     System.out.println(getClass().getSimpleName() + ": sending command " + event.getCommand().getId() + " to " + part);\r
  65                 canvas.getEventQueue().queueEvent(ce);\r
  66             }\r
  67         }\r
  68         return null;\r
  69     }\r
  70 \r
  71 }