bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/modelBrowser/handlers/ContextualHelp.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.modeling.ui.modelBrowser.handlers;\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.jface.viewers.ISelection;\r
  18 import org.eclipse.ui.PlatformUI;\r
  19 import org.eclipse.ui.handlers.HandlerUtil;\r
  20 import org.simantics.Simantics;\r
  21 import org.simantics.databoard.Bindings;\r
  22 import org.simantics.db.ReadGraph;\r
  23 import org.simantics.db.Resource;\r
  24 import org.simantics.db.common.request.ResourceRead;\r
  25 import org.simantics.db.common.utils.Logger;\r
  26 import org.simantics.db.exception.DatabaseException;\r
  27 import org.simantics.db.layer0.variable.Variable;\r
  28 import org.simantics.modeling.ModelingResources;\r
  29 import org.simantics.modeling.PropertyVariables;\r
  30 import org.simantics.ui.selection.WorkbenchSelectionUtils;\r
  31 import org.simantics.utils.ui.AdaptionUtils;\r
  32 \r
  33 public class ContextualHelp extends AbstractHandler {\r
  34 \r
  35     private static String getPossibleId(ExecutionEvent event) {\r
  36         String id = null;\r
  37         try {\r
  38             Resource element = WorkbenchSelectionUtils.getPossibleResource(event);\r
  39             id = Simantics.getSession().syncRequest(new ResourceRead<String>(element) {\r
  40 \r
  41                 @Override\r
  42                 public String perform(ReadGraph graph) throws DatabaseException {\r
  43                     ModelingResources MOD = ModelingResources.getInstance(graph);\r
  44                     Resource component = graph.getPossibleObject(element, MOD.ElementToComponent);\r
  45                     if (component != null)\r
  46                         return graph.getPossibleRelatedValue2(component, MOD.contextualHelpId, Bindings.STRING);\r
  47 \r
  48                     Variable var = WorkbenchSelectionUtils.getPossibleVariable(event);\r
  49                     if (var != null)\r
  50                         return var.getPossiblePropertyValue(graph, MOD.contextualHelpId, Bindings.STRING);\r
  51 \r
  52                     ISelection sel = HandlerUtil.getCurrentSelection(event);\r
  53                     if (sel != null) {\r
  54                         PropertyVariables vars = AdaptionUtils.adaptToSingle(sel, PropertyVariables.class);\r
  55                         if (vars != null) {\r
  56                             var = vars.getConfiguration();\r
  57                             if (var != null)\r
  58                                 var.getPossiblePropertyValue(graph, MOD.contextualHelpId, Bindings.STRING);\r
  59                         }\r
  60                     }\r
  61                     return null;\r
  62                 }\r
  63             });\r
  64         } catch (DatabaseException e) {\r
  65             Logger.defaultLogError(e);\r
  66         }\r
  67         return id;\r
  68     }\r
  69 \r
  70     @Override\r
  71     public Object execute(ExecutionEvent event) throws ExecutionException {\r
  72 \r
  73         String id = getPossibleId(event);\r
  74         if (id != null)\r
  75             PlatformUI.getWorkbench().getHelpSystem().displayHelp(id);\r
  76 \r
  77         return null;\r
  78 \r
  79     }\r
  80 \r
  81 }\r