bundles/org.simantics.diagram/src/org/simantics/diagram/handler/e4/CanvasCommandDelegate.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.diagram.handler.e4;
  13
  14 import javax.inject.Named;
  15
  16 import org.eclipse.core.runtime.IAdaptable;
  17 import org.eclipse.e4.core.di.annotations.CanExecute;
  18 import org.eclipse.e4.core.di.annotations.Execute;
  19 import org.eclipse.e4.ui.model.application.ui.basic.MPart;
  20 import org.eclipse.e4.ui.services.IServiceConstants;
  21 import org.eclipse.ui.IEditorPart;
  22 import org.eclipse.ui.internal.e4.compatibility.CompatibilityEditor;
  23 import org.simantics.g2d.canvas.ICanvasContext;
  24 import org.simantics.scenegraph.g2d.events.EventDebugPolicy;
  25 import org.simantics.scenegraph.g2d.events.EventQueue;
  26 import org.simantics.scenegraph.g2d.events.command.Command;
  27 import org.simantics.scenegraph.g2d.events.command.CommandEvent;
  28 import org.simantics.utils.ui.workbench.WorkbenchUtils;
  29
  30 /**
  31  * A handler for the Eclipse Command framework that delegates ID of the command
  32  * that triggered the event to the {@link EventQueue} of the
  33  * {@link ICanvasContext} where the event occurred.
  34  */
  35 public class CanvasCommandDelegate {
  36
  37     private final boolean DEBUG = EventDebugPolicy.CANVAS_COMMAND_DELEGATION;
  38
  39     private static final String ACTIVE_PART_PARAMETER = "org.simantics.diagram.commandparameter.canvasCommandHandlerActiveWithPart";
  40     private static final String DELEGATE_PARAMETER = "org.simantics.diagram.commandparameter.canvasCommandDelegateParameter";
  41
  42     @CanExecute
  43     public boolean canExecute(@Named(ACTIVE_PART_PARAMETER) String activePartId, @Named(IServiceConstants.ACTIVE_PART) MPart activePart) {
  44         if (activePart == null)
  45             return false;
  46         if (!(activePart.getObject() instanceof CompatibilityEditor))
  47             return false;
  48         CompatibilityEditor compatibilityEditor = (CompatibilityEditor) activePart.getObject();
  49         IEditorPart part = compatibilityEditor.getEditor();
  50         if (part == null)
  51                 return false;
  52         ICanvasContext ctx = part.getAdapter(ICanvasContext.class);
  53         if (ctx == null)
  54             return false;
  55         String id = compatibilityEditor.getReference().getId();
  56         if (!(id.equals(activePartId)))
  57             return false;
  58         return true;
  59     }
  60
  61     @SuppressWarnings("restriction")
  62     @Execute
  63     public void execute(@Named(DELEGATE_PARAMETER) String commandId, @Named(IServiceConstants.ACTIVE_PART) MPart activePart) {
  64         CommandEvent ce = new CommandEvent(null, System.currentTimeMillis(), new Command(commandId));
  65         if (DEBUG)
  66             System.out.println(getClass().getSimpleName() + ": trigger event for command " + ce.command);
  67
  68         Object object = activePart.getObject();
  69
  70         IAdaptable part = null;
  71         if (object instanceof CompatibilityEditor) {
  72             CompatibilityEditor editor = (CompatibilityEditor) object;
  73             part = editor.getPart();
  74         } else if (object instanceof IAdaptable){
  75             part = (IAdaptable) object;
  76         }
  77         ICanvasContext canvas = null;
  78         if (part != null)
  79             canvas = (ICanvasContext) part.getAdapter(ICanvasContext.class);
  80         if (canvas == null) {
  81             part = WorkbenchUtils.getActiveWorkbenchPart();
  82             if (part != null)
  83                 canvas = (ICanvasContext) part.getAdapter(ICanvasContext.class);
  84         }
  85         if (canvas != null) {
  86             if (DEBUG)
  87                 System.out.println(getClass().getSimpleName() + ": sending command " + commandId + " to " + part);
  88             canvas.getEventQueue().queueEvent(ce);
  89         }
  90     }
  91
  92 }