net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/dnd/JdtViewerDragAdapter.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.dnd;
  12
  13 //incastrix
  14 //import org.eclipse.jface.text.Assert;
  15 import org.eclipse.core.runtime.Assert;
  16 import org.eclipse.jface.viewers.IStructuredSelection;
  17 import org.eclipse.jface.viewers.StructuredViewer;
  18 import org.eclipse.swt.dnd.DragSourceEvent;
  19
  20 public class JdtViewerDragAdapter extends DelegatingDragAdapter {
  21
  22         private StructuredViewer fViewer;
  23
  24         public JdtViewerDragAdapter(StructuredViewer viewer,
  25                         TransferDragSourceListener[] listeners) {
  26                 super(listeners);
  27                 Assert.isNotNull(viewer);
  28                 fViewer = viewer;
  29         }
  30
  31         public void dragStart(DragSourceEvent event) {
  32                 IStructuredSelection selection = (IStructuredSelection) fViewer
  33                                 .getSelection();
  34                 if (selection.isEmpty()) {
  35                         event.doit = false;
  36                         return;
  37                 }
  38                 super.dragStart(event);
  39         }
  40 }