net.sourceforge.phpeclipse.ui/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.ui.WebUI;
  21 //import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  22
  23 import org.eclipse.core.resources.IResource;
  24 import org.eclipse.core.runtime.CoreException;
  25 import org.eclipse.core.runtime.IAdaptable;
  26 import org.eclipse.core.runtime.IStatus;
  27 import org.eclipse.core.runtime.MultiStatus;
  28 import org.eclipse.jface.dialogs.ErrorDialog;
  29 import org.eclipse.jface.util.Assert;
  30 import org.eclipse.jface.viewers.ISelection;
  31 import org.eclipse.jface.viewers.ISelectionProvider;
  32 import org.eclipse.jface.viewers.IStructuredSelection;
  33 import org.eclipse.swt.dnd.DND;
  34 import org.eclipse.swt.dnd.DragSourceAdapter;
  35 import org.eclipse.swt.dnd.DragSourceEvent;
  36 import org.eclipse.swt.dnd.Transfer;
  37 import org.eclipse.swt.widgets.Shell;
  38 import org.eclipse.ui.part.ResourceTransfer;
  39
  40 /**
  41  * A drag adapter that transfers the current selection as </code> IResource</code>.
  42  * Only those elements in the selection are part of the transfer which can be
  43  * converted into an <code>IResource </code>.
  44  */
  45 public class ResourceTransferDragAdapter extends DragSourceAdapter implements
  46                 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
  57          *            the selection provider to access the viewer's selection
  58          */
  59         public ResourceTransferDragAdapter(ISelectionProvider provider) {
  60                 fProvider = provider;
  61                 Assert.isNotNull(fProvider);
  62         }
  63
  64         public Transfer getTransfer() {
  65                 return ResourceTransfer.getInstance();
  66         }
  67
  68         public void dragStart(DragSourceEvent event) {
  69                 event.doit = convertSelection().size() > 0;
  70         }
  71
  72         public void dragSetData(DragSourceEvent event) {
  73                 List resources = convertSelection();
  74                 event.data = (IResource[]) resources.toArray(new IResource[resources
  75                                 .size()]);
  76         }
  77
  78         public void dragFinished(DragSourceEvent event) {
  79                 if (!event.doit)
  80                         return;
  81
  82                 if (event.detail == DND.DROP_MOVE) {
  83                         handleFinishedDropMove(event);
  84                 }
  85         }
  86
  87         private List convertSelection() {
  88                 ISelection s = fProvider.getSelection();
  89                 if (!(s instanceof IStructuredSelection))
  90                         return EMPTY_LIST;
  91                 IStructuredSelection selection = (IStructuredSelection) s;
  92                 List result = new ArrayList(selection.size());
  93                 for (Iterator iter = selection.iterator(); iter.hasNext();) {
  94                         Object element = iter.next();
  95                         if (element instanceof IAdaptable) {
  96                                 IAdaptable adaptable = (IAdaptable) element;
  97                                 IResource resource = (IResource) adaptable
  98                                                 .getAdapter(IResource.class);
  99                                 if (resource != null)
 100                                         result.add(resource);
 101                         }
 102                 }
 103                 return result;
 104         }
 105
 106         private void handleFinishedDropMove(DragSourceEvent event) {
 107                 MultiStatus status = new MultiStatus(
 108                                 WebUI.getPluginId(),
 109                                 IJavaStatusConstants.INTERNAL_ERROR,
 110                                 PHPUIMessages
 111                                                 .getString("ResourceTransferDragAdapter.cannot_delete_resource"), //$NON-NLS-1$
 112                                 null);
 113                 List resources = convertSelection();
 114                 for (Iterator iter = resources.iterator(); iter.hasNext();) {
 115                         IResource resource = (IResource) iter.next();
 116                         try {
 117                                 resource.delete(true, null);
 118                         } catch (CoreException e) {
 119                                 status.add(e.getStatus());
 120                         }
 121                 }
 122                 if (status.getChildren().length > 0) {
 123                         Shell parent = SWTUtil.getShell(event.widget);
 124                         ErrorDialog error = new ErrorDialog(
 125                                         parent,
 126                                         PHPUIMessages
 127                                                         .getString("ResourceTransferDragAdapter.moving_resource"), //$NON-NLS-1$
 128                                         PHPUIMessages
 129                                                         .getString("ResourceTransferDragAdapter.cannot_delete_files"), //$NON-NLS-1$
 130                                         status, IStatus.ERROR);
 131                         error.open();
 132                 }
 133         }
 134 }