gerrit.simantics Code Review - simantics/sysdyn.git/blob

   1 package org.simantics.sysdyn.ui.editor.participant;\r
   2 \r
   3 import java.awt.datatransfer.Transferable;\r
   4 import java.awt.datatransfer.UnsupportedFlavorException;\r
   5 import java.awt.dnd.DropTargetDragEvent;\r
   6 import java.io.IOException;\r
   7 \r
   8 import org.eclipse.core.runtime.IAdaptable;\r
   9 import org.eclipse.jface.viewers.IStructuredSelection;\r
  10 import org.simantics.db.ReadGraph;\r
  11 import org.simantics.db.Resource;\r
  12 import org.simantics.db.exception.DatabaseException;\r
  13 import org.simantics.db.request.Read;\r
  14 import org.simantics.diagram.adapter.GraphToDiagramSynchronizer;\r
  15 import org.simantics.diagram.ui.DiagramModelHints;\r
  16 import org.simantics.g2d.dnd.IDnDContext;\r
  17 import org.simantics.modeling.ModelingResources;\r
  18 import org.simantics.modeling.ui.diagramEditor.PopulateElementDropParticipant;\r
  19 import org.simantics.structural.stubs.StructuralResource2;\r
  20 import org.simantics.sysdyn.SysdynResource;\r
  21 import org.simantics.ui.dnd.LocalObjectTransfer;\r
  22 import org.simantics.ui.dnd.LocalObjectTransferable;\r
  23 \r
  24 public class SysdynPopulateElementDropParticipant extends PopulateElementDropParticipant {\r
  25 \r
  26         public SysdynPopulateElementDropParticipant(GraphToDiagramSynchronizer synchronizer) {\r
  27                 super(synchronizer);\r
  28         }\r
  29 \r
  30     @Override\r
  31     public void dragEnter(DropTargetDragEvent dtde, IDnDContext dp) {\r
  32         Transferable tr = dtde.getTransferable();\r
  33         if (tr.isDataFlavorSupported(LocalObjectTransferable.FLAVOR)) {\r
  34             // This must be done to have SWT transfer set the source data\r
  35             Object obj = null;\r
  36             try {\r
  37                 obj = tr.getTransferData(LocalObjectTransferable.FLAVOR);\r
  38             } catch (UnsupportedFlavorException e) {\r
  39                 e.printStackTrace();\r
  40             } catch (IOException e) {\r
  41                 e.printStackTrace();\r
  42             }\r
  43             \r
  44             // Check SWT\r
  45             if (!(obj instanceof IStructuredSelection)) {\r
  46                 obj = LocalObjectTransfer.getTransfer().getObject();\r
  47             }\r
  48             \r
  49             if (obj instanceof IStructuredSelection) {\r
  50                 final IStructuredSelection sel = (IStructuredSelection) obj;\r
  51                 if (!sel.isEmpty()) {\r
  52                         \r
  53                         boolean allowed = true;\r
  54                         try {\r
  55                                 allowed = synchronizer.getSession().syncRequest(new Read<Boolean>(){\r
  56 \r
  57                                                         @Override\r
  58                                                         public Boolean perform(ReadGraph graph)\r
  59                                                                         throws DatabaseException {\r
  60                                             for (Object elm : sel.toList()) {\r
  61                                                 if (elm instanceof IAdaptable) {\r
  62                                                         Object r = ((IAdaptable) elm).getAdapter(Resource.class);\r
  63                                                         if(r != null && r instanceof Resource) {\r
  64                                                                 Resource resource = (Resource)r;\r
  65                                                                 SysdynResource sr = SysdynResource.getInstance(graph);\r
  66                                                                 if(graph.isInheritedFrom(resource, sr.ModuleSymbol)) {\r
  67                                                                         Resource module = graph.getSingleObject(resource, ModelingResources.getInstance(graph).SymbolToComponentType);\r
  68                                                                         Resource configuration = graph.getSingleObject(module, StructuralResource2.getInstance(graph).IsDefinedBy);\r
  69                                                                         Resource dia = graph.getSingleObject(configuration, ModelingResources.getInstance(graph).CompositeToDiagram);\r
  70                                                                         Resource editorDia = diagram.getHint(DiagramModelHints.KEY_DIAGRAM_RESOURCE);\r
  71                                                                         if(dia.equals(editorDia))\r
  72                                                                                 return false;\r
  73                                                                 }\r
  74                                                         }\r
  75                                                 }\r
  76                                             }\r
  77                                                                 return true;\r
  78                                                         }\r
  79                                                         \r
  80                                                 });\r
  81                                         } catch (DatabaseException e) {\r
  82                                                 e.printStackTrace();\r
  83                                         }\r
  84                                         \r
  85                                         // Trying to populate an instance of self to diagram -> infinite recursion\r
  86                                         // This limitation should be removed by allowing differentation (copies) from modules. i.e. detaching from class and creating a new module type\r
  87                                         if(!allowed)\r
  88                                                 return;\r
  89                 }\r
  90             }\r
  91         }\r
  92         super.dragEnter(dtde, dp);\r
  93     }\r
  94 }\r