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  * A drag adapter that transfers the current selection as </code> IResource</code>.
  41  * Only those elements in the selection are part of the transfer which can be
  42  * converted into an <code>IResource </code>.
  43  */
  44 public class ResourceTransferDragAdapter extends DragSourceAdapter implements
  45                 TransferDragSourceListener {
  46
  47         private ISelectionProvider fProvider;
  48
  49         private static final List EMPTY_LIST = new ArrayList(0);
  50
  51         /**
  52          * Creates a new ResourceTransferDragAdapter for the given selection
  53          * provider.
  54          *
  55          * @param provider
  56          *            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
  74                                 .size()]);
  75         }
  76
  77         public void dragFinished(DragSourceEvent event) {
  78                 if (!event.doit)
  79                         return;
  80
  81                 if (event.detail == DND.DROP_MOVE) {
  82                         handleFinishedDropMove(event);
  83                 }
  84         }
  85
  86         private List convertSelection() {
  87                 ISelection s = fProvider.getSelection();
  88                 if (!(s instanceof IStructuredSelection))
  89                         return EMPTY_LIST;
  90                 IStructuredSelection selection = (IStructuredSelection) s;
  91                 List result = new ArrayList(selection.size());
  92                 for (Iterator iter = selection.iterator(); iter.hasNext();) {
  93                         Object element = iter.next();
  94                         if (element instanceof IAdaptable) {
  95                                 IAdaptable adaptable = (IAdaptable) element;
  96                                 IResource resource = (IResource) adaptable
  97                                                 .getAdapter(IResource.class);
  98                                 if (resource != null)
  99                                         result.add(resource);
 100                         }
 101                 }
 102                 return result;
 103         }
 104
 105         private void handleFinishedDropMove(DragSourceEvent event) {
 106                 MultiStatus status = new MultiStatus(
 107                                 PHPeclipsePlugin.getPluginId(),
 108                                 IJavaStatusConstants.INTERNAL_ERROR,
 109                                 PHPUIMessages
 110                                                 .getString("ResourceTransferDragAdapter.cannot_delete_resource"), //$NON-NLS-1$
 111                                 null);
 112                 List resources = convertSelection();
 113                 for (Iterator iter = resources.iterator(); iter.hasNext();) {
 114                         IResource resource = (IResource) iter.next();
 115                         try {
 116                                 resource.delete(true, null);
 117                         } catch (CoreException e) {
 118                                 status.add(e.getStatus());
 119                         }
 120                 }
 121                 if (status.getChildren().length > 0) {
 122                         Shell parent = SWTUtil.getShell(event.widget);
 123                         ErrorDialog error = new ErrorDialog(
 124                                         parent,
 125                                         PHPUIMessages
 126                                                         .getString("ResourceTransferDragAdapter.moving_resource"), //$NON-NLS-1$
 127                                         PHPUIMessages
 128                                                         .getString("ResourceTransferDragAdapter.cannot_delete_files"), //$NON-NLS-1$
 129                                         status, IStatus.ERROR);
 130                         error.open();
 131                 }
 132         }
 133 }