eclipseprojects/eu.etaxonomy.taxeditor/src/eu/etaxonomy/taxeditor/editor/GroupComposite.java

   1 /**
   2 * Copyright (C) 2007 EDIT
   3 * European Distributed Institute of Taxonomy
   4 * http://www.e-taxonomy.eu
   5 *
   6 * The contents of this file are subject to the Mozilla Public License Version 1.1
   7 * See LICENSE.TXT at the top of this package for the full license terms.
   8 */
   9
  10 package eu.etaxonomy.taxeditor.editor;
  11
  12 import org.apache.log4j.Logger;
  13 import org.eclipse.swt.SWT;
  14 import org.eclipse.swt.dnd.DND;
  15 import org.eclipse.swt.dnd.DropTarget;
  16 import org.eclipse.swt.dnd.DropTargetAdapter;
  17 import org.eclipse.swt.dnd.DropTargetEvent;
  18 import org.eclipse.swt.dnd.DropTargetListener;
  19 import org.eclipse.swt.dnd.Transfer;
  20 import org.eclipse.swt.graphics.Color;
  21 import org.eclipse.swt.widgets.Composite;
  22 import org.eclipse.swt.widgets.Event;
  23 import org.eclipse.swt.widgets.Listener;
  24 import org.eclipse.ui.forms.widgets.TableWrapData;
  25 import org.eclipse.ui.forms.widgets.TableWrapLayout;
  26
  27 import eu.etaxonomy.taxeditor.ITaxEditorConstants;
  28 import eu.etaxonomy.taxeditor.TaxEditorPlugin;
  29 import eu.etaxonomy.taxeditor.actions.WidgetTransfer;
  30
  31 /**
  32  * @author p.ciardelli
  33  * @created 25.06.2008
  34  * @version 1.0
  35  */
  36 public class GroupComposite extends Composite {
  37         private static final Logger logger = Logger.getLogger(GroupComposite.class);
  38
  39         private DropTarget target;
  40         private DropTargetListener dropListener;
  41
  42         public GroupComposite(Composite parent) {
  43                 super(parent, SWT.NONE);
  44
  45                 // Graphic layout of composite
  46                 this.setLayoutData(new TableWrapData(TableWrapData.FILL_GRAB));
  47                 this.setLayout(new TableWrapLayout());
  48                 Color groupBackgroundColor = TaxEditorPlugin.getDefault().
  49                                 getColor(ITaxEditorConstants.GROUP_GRAY_BKG_COLOR);
  50                 this.setBackground(groupBackgroundColor);
  51
  52                 // Drop functionality
  53                 this.setDroppable(true);
  54         }
  55
  56         public void setDroppable(boolean droppable) {
  57                 if (droppable) {
  58                         Transfer[] types = new Transfer[] {WidgetTransfer.getInstance()};
  59                         int operations = DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_DEFAULT;
  60                         target = new DropTarget(this, operations);
  61                         target.setTransfer(types);
  62                         dropListener = new DropTargetAdapter() {
  63
  64                                 public void dragEnter(DropTargetEvent event) {
  65                                         GroupComposite.this.notifyListeners(SWT.FocusIn, null);
  66                                 }
  67
  68                                 public void dragLeave(DropTargetEvent event) {
  69                                         GroupComposite.this.notifyListeners(SWT.FocusOut, null);
  70                                 }
  71
  72                                 public void drop(DropTargetEvent event) {
  73
  74                                         if (event.data instanceof GroupedComposite) {
  75
  76                                                 final GroupedComposite composite = (GroupedComposite) event.data;
  77                                                 if (composite.getDragSource() != null) {
  78
  79                                                         // Make sure composite is not being dropped onto its current parent
  80                                                         if ( ! composite.getParent().equals(GroupComposite.this)) {
  81
  82                                                                 // Change parent at end of drag event
  83                                                                 composite.getDragSource().addListener(DND.DragEnd, new Listener() {
  84                                                                         @Override
  85                                                                         public void handleEvent(Event event) {
  86                                                                                 composite.setParent(GroupComposite.this);
  87                                                                         }
  88                                                                 });
  89                                                         }
  90                                                 }
  91                                         }
  92                                 }
  93                         };
  94                         target.addDropListener(dropListener);
  95                 } else {
  96                         if (dropListener != null) {
  97                                 target.removeDropListener(dropListener);
  98                         }
  99                 }
 100         }
 101
 102         public void dispose() {
 103
 104                 if (target != null) {
 105                         target.removeDropListener(dropListener);
 106                         target.dispose();
 107                 }
 108
 109                 super.dispose();
 110         }
 111 }