bundles/org.simantics.diagram/src/org/simantics/diagram/participant/PopulateSelectionDropParticipant.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.participant;
  13
  14 import java.awt.datatransfer.Transferable;
  15 import java.awt.datatransfer.UnsupportedFlavorException;
  16 import java.awt.dnd.DnDConstants;
  17 import java.awt.dnd.DropTargetDragEvent;
  18 import java.awt.dnd.DropTargetDropEvent;
  19 import java.awt.dnd.DropTargetEvent;
  20 import java.awt.geom.Point2D;
  21 import java.io.IOException;
  22 import java.util.List;
  23
  24 import org.eclipse.jface.viewers.IStructuredSelection;
  25 import org.simantics.db.Session;
  26 import org.simantics.db.exception.DatabaseException;
  27 import org.simantics.diagram.adapter.GraphToDiagramSynchronizer;
  28 import org.simantics.g2d.diagram.DiagramHints;
  29 import org.simantics.g2d.diagram.DiagramUtils;
  30 import org.simantics.g2d.diagram.IDiagram;
  31 import org.simantics.g2d.diagram.participant.AbstractDiagramParticipant;
  32 import org.simantics.g2d.dnd.DnDHints;
  33 import org.simantics.g2d.dnd.ElementClassDragItem;
  34 import org.simantics.g2d.dnd.IDnDContext;
  35 import org.simantics.g2d.dnd.IDragItem;
  36 import org.simantics.g2d.dnd.IDropTargetParticipant;
  37 import org.simantics.g2d.element.ElementClass;
  38 import org.simantics.g2d.element.ElementUtils;
  39 import org.simantics.g2d.element.IElement;
  40 import org.simantics.scenegraph.g2d.snap.ISnapAdvisor;
  41 import org.simantics.ui.dnd.LocalObjectTransfer;
  42 import org.simantics.ui.dnd.LocalObjectTransferable;
  43 import org.simantics.utils.logging.TimeLogger;
  44 import org.slf4j.Logger;
  45 import org.slf4j.LoggerFactory;
  46
  47 abstract public class PopulateSelectionDropParticipant extends AbstractDiagramParticipant implements IDropTargetParticipant {
  48
  49         private static final Logger LOGGER = LoggerFactory.getLogger(PopulateSelectionDropParticipant.class);
  50
  51         public abstract List<ElementClassDragItem> getElements(Session session, IStructuredSelection selection) throws DatabaseException;
  52
  53         protected GraphToDiagramSynchronizer synchronizer;
  54
  55         public PopulateSelectionDropParticipant(GraphToDiagramSynchronizer synchronizer) {
  56                 this.synchronizer = synchronizer;
  57         }
  58
  59         @Override
  60         public void dragEnter(DropTargetDragEvent dtde, final IDnDContext dp) {
  61
  62                 Transferable tr = dtde.getTransferable();
  63
  64                 if (tr.isDataFlavorSupported(LocalObjectTransferable.FLAVOR)) {
  65
  66                         Session session = synchronizer.getSession();
  67
  68                         // System.out.println("joo");
  69                         Object obj = null;
  70
  71                         // This must be done to have SWT transfer set the source data
  72                         try {
  73
  74                                 obj = tr.getTransferData(LocalObjectTransferable.FLAVOR);
  75                                 //System.out.println("GOT FROM AWT: " + obj);
  76
  77                                 // Check SWT
  78                                 if (!(obj instanceof IStructuredSelection)) {
  79                                         obj = LocalObjectTransfer.getTransfer().getObject();
  80                                         //System.out.println("GOT FROM SWT: " + obj);
  81                                 }
  82
  83                                 if (obj instanceof IStructuredSelection) {
  84
  85                                         IStructuredSelection sel = (IStructuredSelection) obj;
  86                                         if (!sel.isEmpty()) {
  87
  88                                                 List<ElementClassDragItem> items = getElements(session, sel);
  89
  90                                                 for(ElementClassDragItem item : items) {
  91                                                         dp.add(item);
  92                                                 }
  93
  94                                                 dp.getHints().setHint(DnDHints.KEY_DND_GRID_COLUMNS, Integer.valueOf(1));
  95
  96                                         }
  97
  98                                 }
  99
 100                         } catch (DatabaseException | IOException | UnsupportedFlavorException e) {
 101                                 LOGGER.error("Unexpected failure", e);
 102                         }
 103
 104                 }
 105
 106                 dtde.acceptDrag(DnDConstants.ACTION_COPY);
 107
 108         }
 109
 110         @Override
 111         public void drop(DropTargetDropEvent dtde, final IDnDContext dp) {
 112             TimeLogger.resetTimeAndLog(getClass(), "drop");
 113
 114         final IDiagram d = getHint(DiagramHints.KEY_DIAGRAM);
 115         if (d == null)
 116             return;
 117
 118         DiagramUtils.mutateDiagram(d, m -> {
 119             IDragItem items[] = dp.toArray();
 120
 121             for (IDragItem i : items) {
 122                 if (!(i instanceof ElementClassDragItem))
 123                     continue;
 124
 125                 ElementClassDragItem res = (ElementClassDragItem) i;
 126                 ElementClass ec = res.getElementClass();
 127
 128                 Point2D pos = dp.getItemPosition(i);
 129                 // System.out.println(pos);
 130                 assert (pos != null);
 131
 132                 IElement element = m.newElement(ec);
 133                 element.setHints(res.getHintContext().getHints());
 134
 135                 ISnapAdvisor snapAdvisor = getContext().getHintStack().getHint(DiagramHints.SNAP_ADVISOR);
 136                 if(snapAdvisor != null)
 137                     snapAdvisor.snap(pos);
 138                 ElementUtils.setPos(element, pos);
 139
 140                 // Remove only the drag items we've processed.
 141                 dp.remove(i);
 142             }
 143         });
 144
 145         synchronizer.getCanvasContext().getContentContext().setDirty();
 146
 147         }
 148
 149         @Override
 150         public void dragOver(DropTargetDragEvent dtde, IDnDContext dp) {
 151         }
 152
 153         @Override
 154         public void dragExit(DropTargetEvent dte, IDnDContext dp) {
 155         }
 156
 157         @Override
 158         public void dropActionChanged(DropTargetDragEvent dtde, IDnDContext dp) {
 159         }
 160
 161         @Override
 162         public int getAllowedOps() {
 163                 return 0;
 164         }
 165
 166     @Override
 167     public double getPriority() {
 168         return 9.1;
 169     }
 170
 171 }