org.simantics.g3d/src/org/simantics/proconf/g3d/dnd/ShapeDropTarget.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007- VTT Technical Research Centre of Finland.\r
   3  * All rights reserved. This program and the accompanying materials\r
   4  * are made available under the terms of the Eclipse Public License v1.0\r
   5  * which accompanies this distribution, and is available at\r
   6  * http://www.eclipse.org/legal/epl-v10.html\r
   7  *\r
   8  * Contributors:\r
   9  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  10  *******************************************************************************/\r
  11 package org.simantics.proconf.g3d.dnd;\r
  12 \r
  13 import java.util.ArrayList;\r
  14 import java.util.List;\r
  15 \r
  16 import org.eclipse.swt.dnd.DND;\r
  17 import org.eclipse.swt.dnd.DropTarget;\r
  18 import org.eclipse.swt.dnd.DropTargetEvent;\r
  19 import org.eclipse.swt.dnd.DropTargetListener;\r
  20 import org.eclipse.swt.dnd.TextTransfer;\r
  21 import org.eclipse.swt.dnd.Transfer;\r
  22 import org.eclipse.swt.dnd.TransferData;\r
  23 import org.eclipse.swt.graphics.Point;\r
  24 import org.eclipse.swt.widgets.Control;\r
  25 import org.simantics.db.Resource;\r
  26 import org.simantics.proconf.g3d.base.ThreeDimensionalEditorBase;\r
  27 import org.simantics.proconf.g3d.common.StructuredResourceSelection;\r
  28 import org.simantics.proconf.ui.dnd.ResourceReferenceTransfer;\r
  29 \r
  30 public class ShapeDropTarget implements DropTargetListener{\r
  31         ThreeDimensionalEditorBase editor;\r
  32         List<DropListener> listeners;\r
  33         final Control control;\r
  34     private DropTarget target; \r
  35     \r
  36         public ShapeDropTarget(ThreeDimensionalEditorBase editor) {\r
  37                 this.editor = editor;\r
  38                 listeners = new ArrayList<DropListener>();\r
  39                 this.control = editor.getRenderingComposite();\r
  40         \r
  41         target = new DropTarget(control, DND.DROP_LINK);\r
  42         target.setTransfer(new Transfer[] { ResourceReferenceTransfer.getInstance() });\r
  43         target.addDropListener(this);  \r
  44         }\r
  45         \r
  46         public void addDropListener(DropListener listener) {\r
  47                 listeners.add(listener);\r
  48         }\r
  49         \r
  50         public void removeDropListener(DropListener listener) {\r
  51                 listeners.remove(listener);\r
  52         }\r
  53         \r
  54         @Override\r
  55         public void dragEnter(DropTargetEvent event) {\r
  56                 event.detail = DND.DROP_LINK;\r
  57                 dragOver(event);\r
  58         }\r
  59         \r
  60         public void dragOperationChanged(DropTargetEvent event) {\r
  61     }\r
  62         \r
  63         public void dropAccept(DropTargetEvent event) {\r
  64     }\r
  65         \r
  66         public void dragLeave(DropTargetEvent event) {\r
  67     }\r
  68 \r
  69         \r
  70         @Override\r
  71         public void dragOver(DropTargetEvent event) {\r
  72                 // FIXME : a hack to get the actual data (probably works only in Windows)\r
  73                 TransferData data = event.currentDataType;\r
  74                 if(!TextTransfer.getInstance().isSupportedType(data))\r
  75                         return;\r
  76                 Object o = TextTransfer.getInstance().nativeToJava(data);\r
  77                 \r
  78                 Point p = getLocalCoords(event);\r
  79                 editor.getInputProvider().setMouseMoved(true);\r
  80                 editor.getInputProvider().setMouseX(p.x);\r
  81                 editor.getInputProvider().setMouseY(p.y);\r
  82                 editor.run();\r
  83                 StructuredResourceSelection sel = editor.getSelectionAdapter().getHighlightSelection();\r
  84                 \r
  85                 event.data = o;\r
  86                 Resource ids[] = parseEventData(event);\r
  87                 for (DropListener l : listeners) {\r
  88                         if(l.acceptDrop(sel, ids)) {\r
  89                                 event.detail = DND.DROP_LINK;\r
  90                                 return;\r
  91                         }\r
  92                 }\r
  93                 event.detail = DND.DROP_NONE;           \r
  94         }\r
  95         \r
  96         @Override\r
  97         public void drop(DropTargetEvent event) {\r
  98                 StructuredResourceSelection sel = editor.getSelectionAdapter().getHighlightSelection();\r
  99                 Resource ids[] = parseEventData(event);\r
 100                 for (DropListener l : listeners) {\r
 101                         if(l.acceptDrop(sel, ids)) {\r
 102                                 l.doDrop(sel, ids);\r
 103                                 return;\r
 104                         }\r
 105                 }\r
 106         }\r
 107         \r
 108         protected Point getLocalCoords(DropTargetEvent event) {\r
 109                 return editor.getRenderingComposite().toControl(event.x, event.y);\r
 110         }\r
 111         \r
 112         public void dispose()\r
 113     {\r
 114         target.removeDropListener(this);\r
 115         target = null;\r
 116     }\r
 117         \r
 118         private Resource[] parseEventData(DropTargetEvent event) {\r
 119         if (ResourceReferenceTransfer.getInstance().isSupportedType(event.currentDataType) && (event.data instanceof Resource[])) {\r
 120             return (Resource[]) event.data;\r
 121         }\r
 122         return null;\r
 123     }\r
 124 }\r