net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/dnd/ResourceTransferDragAdapter.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 import java.util.ArrayList;
  14 import java.util.Iterator;
  15 import java.util.List;
  16
  17 import net.sourceforge.phpdt.internal.ui.IJavaStatusConstants;
  18 import net.sourceforge.phpdt.internal.ui.PHPUIMessages;
  19 import net.sourceforge.phpdt.internal.ui.util.SWTUtil;
  20 import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  21
  22 import org.eclipse.core.resources.IResource;
  23 import org.eclipse.core.runtime.CoreException;
  24 import org.eclipse.core.runtime.IAdaptable;
  25 import org.eclipse.core.runtime.IStatus;
  26 import org.eclipse.core.runtime.MultiStatus;
  27 import org.eclipse.jface.dialogs.ErrorDialog;
  28 import org.eclipse.jface.util.Assert;
  29 import org.eclipse.jface.viewers.ISelection;
  30 import org.eclipse.jface.viewers.ISelectionProvider;
  31 import org.eclipse.jface.viewers.IStructuredSelection;
  32 import org.eclipse.swt.dnd.DND;
  33 import org.eclipse.swt.dnd.DragSourceAdapter;
  34 import org.eclipse.swt.dnd.DragSourceEvent;
  35 import org.eclipse.swt.dnd.Transfer;
  36 import org.eclipse.swt.widgets.Shell;
  37 import org.eclipse.ui.part.ResourceTransfer;
  38
  39
  40 /**
  41  * A drag adapter that transfers the current selection as </code>
  42  * IResource</code>. Only those elements in the selection are part
  43  * of the transfer which can be converted into an <code>IResource
  44  * </code>.
  45  */
  46 public class ResourceTransferDragAdapter extends DragSourceAdapter implements TransferDragSourceListener {
  47
  48         private ISelectionProvider fProvider;
  49
  50         private static final List EMPTY_LIST= new ArrayList(0);
  51
  52         /**
  53          * Creates a new ResourceTransferDragAdapter for the given selection
  54          * provider.
  55          *
  56          * @param provider the selection provider to access the viewer's selection
  57          */
  58         public ResourceTransferDragAdapter(ISelectionProvider provider) {
  59                 fProvider= provider;
  60                 Assert.isNotNull(fProvider);
  61         }
  62
  63         public Transfer getTransfer() {
  64                 return ResourceTransfer.getInstance();
  65         }
  66
  67         public void dragStart(DragSourceEvent event) {
  68                 event.doit= convertSelection().size() > 0;
  69         }
  70
  71         public void dragSetData(DragSourceEvent event) {
  72                 List resources= convertSelection();
  73                 event.data= (IResource[]) resources.toArray(new IResource[resources.size()]);
  74         }
  75
  76         public void dragFinished(DragSourceEvent event) {
  77                 if (!event.doit)
  78                         return;
  79
  80                 if (event.detail == DND.DROP_MOVE) {
  81                         handleFinishedDropMove(event);
  82                 }
  83         }
  84
  85         private List convertSelection() {
  86                 ISelection s= fProvider.getSelection();
  87                 if (!(s instanceof IStructuredSelection))
  88                         return EMPTY_LIST;
  89                 IStructuredSelection selection= (IStructuredSelection)s;
  90                 List result= new ArrayList(selection.size());
  91                 for (Iterator iter= selection.iterator(); iter.hasNext();) {
  92                         Object element= iter.next();
  93                         if (element instanceof IAdaptable) {
  94                                 IAdaptable adaptable= (IAdaptable)element;
  95                                 IResource resource= (IResource)adaptable.getAdapter(IResource.class);
  96                                 if (resource != null)
  97                                         result.add(resource);
  98                         }
  99                 }
 100                 return result;
 101         }
 102
 103         private void handleFinishedDropMove(DragSourceEvent event) {
 104                 MultiStatus status= new MultiStatus(
 105                         PHPeclipsePlugin.getPluginId(),
 106                         IJavaStatusConstants.INTERNAL_ERROR,
 107                         PHPUIMessages.getString("ResourceTransferDragAdapter.cannot_delete_resource"),  //$NON-NLS-1$
 108                         null);
 109                 List resources= convertSelection();
 110                 for (Iterator iter= resources.iterator(); iter.hasNext();) {
 111                         IResource resource= (IResource) iter.next();
 112                         try {
 113                                 resource.delete(true, null);
 114                         } catch (CoreException e) {
 115                                 status.add(e.getStatus());
 116                         }
 117                 }
 118                 if (status.getChildren().length > 0) {
 119                         Shell parent= SWTUtil.getShell(event.widget);
 120                         ErrorDialog error= new ErrorDialog(parent,
 121                           PHPUIMessages.getString("ResourceTransferDragAdapter.moving_resource"),  //$NON-NLS-1$
 122                           PHPUIMessages.getString("ResourceTransferDragAdapter.cannot_delete_files"),  //$NON-NLS-1$
 123                                 status, IStatus.ERROR);
 124                         error.open();
 125                 }
 126         }
 127 }
 128