bundles/org.simantics.diagram/src/org/simantics/diagram/handler/e4/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.e4;\r
  13 \r
  14 import javax.inject.Named;\r
  15 \r
  16 import org.eclipse.core.runtime.IAdaptable;\r
  17 import org.eclipse.e4.core.di.annotations.CanExecute;\r
  18 import org.eclipse.e4.core.di.annotations.Execute;\r
  19 import org.eclipse.e4.ui.model.application.ui.basic.MPart;\r
  20 import org.eclipse.e4.ui.services.IServiceConstants;\r
  21 import org.eclipse.ui.IEditorPart;\r
  22 import org.eclipse.ui.internal.e4.compatibility.CompatibilityEditor;\r
  23 import org.simantics.g2d.canvas.ICanvasContext;\r
  24 import org.simantics.scenegraph.g2d.events.EventDebugPolicy;\r
  25 import org.simantics.scenegraph.g2d.events.EventQueue;\r
  26 import org.simantics.scenegraph.g2d.events.command.Command;\r
  27 import org.simantics.scenegraph.g2d.events.command.CommandEvent;\r
  28 import org.simantics.utils.ui.workbench.WorkbenchUtils;\r
  29 \r
  30 /**\r
  31  * A handler for the Eclipse Command framework that delegates ID of the command\r
  32  * that triggered the event to the {@link EventQueue} of the\r
  33  * {@link ICanvasContext} where the event occurred.\r
  34  */\r
  35 public class CanvasCommandDelegate {\r
  36 \r
  37     private final boolean DEBUG = EventDebugPolicy.CANVAS_COMMAND_DELEGATION;\r
  38     \r
  39     private static final String ACTIVE_PART_PARAMETER = "org.simantics.diagram.commandparameter.canvasCommandHandlerActiveWithPart";\r
  40     private static final String DELEGATE_PARAMETER = "org.simantics.diagram.commandparameter.canvasCommandDelegateParameter";\r
  41 \r
  42     @CanExecute\r
  43     public boolean canExecute(@Named(ACTIVE_PART_PARAMETER) String activePartId, @Named(IServiceConstants.ACTIVE_PART) MPart activePart) {\r
  44         if (activePart == null)\r
  45             return false;\r
  46         if (!(activePart.getObject() instanceof CompatibilityEditor))\r
  47             return false;\r
  48         CompatibilityEditor compatibilityEditor = (CompatibilityEditor) activePart.getObject();\r
  49         IEditorPart part = compatibilityEditor.getEditor();\r
  50         if (part == null)\r
  51                 return false;\r
  52         ICanvasContext ctx = part.getAdapter(ICanvasContext.class);\r
  53         if (ctx == null)\r
  54             return false;\r
  55         String id = compatibilityEditor.getReference().getId();\r
  56         if (!(id.equals(activePartId)))\r
  57             return false;\r
  58         return true;\r
  59     }\r
  60     \r
  61     @SuppressWarnings("restriction")\r
  62     @Execute\r
  63     public void execute(@Named(DELEGATE_PARAMETER) String commandId, @Named(IServiceConstants.ACTIVE_PART) MPart activePart) {\r
  64         CommandEvent ce = new CommandEvent(null, System.currentTimeMillis(), new Command(commandId));\r
  65         if (DEBUG)\r
  66             System.out.println(getClass().getSimpleName() + ": trigger event for command " + ce.command);\r
  67 \r
  68         Object object = activePart.getObject();\r
  69         \r
  70         IAdaptable part = null;\r
  71         if (object instanceof CompatibilityEditor) {\r
  72             CompatibilityEditor editor = (CompatibilityEditor) object;\r
  73             part = editor.getPart();\r
  74         } else if (object instanceof IAdaptable){\r
  75             part = (IAdaptable) object; \r
  76         }\r
  77         ICanvasContext canvas = null;\r
  78         if (part != null)\r
  79             canvas = (ICanvasContext) part.getAdapter(ICanvasContext.class);\r
  80         if (canvas == null) {\r
  81             part = WorkbenchUtils.getActiveWorkbenchPart();\r
  82             if (part != null)\r
  83                 canvas = (ICanvasContext) part.getAdapter(ICanvasContext.class);\r
  84         }\r
  85         if (canvas != null) {\r
  86             if (DEBUG)\r
  87                 System.out.println(getClass().getSimpleName() + ": sending command " + commandId + " to " + part);\r
  88             canvas.getEventQueue().queueEvent(ce);\r
  89         }\r
  90     }\r
  91 \r
  92 }