| /******************************************************************************* |
| * Copyright (c) 2000, 2015 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.cdt.internal.ui.dnd; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.eclipse.cdt.internal.ui.CUIMessages; |
| import org.eclipse.core.resources.IResource; |
| import org.eclipse.core.runtime.Assert; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IAdaptable; |
| import org.eclipse.jface.viewers.ISelection; |
| import org.eclipse.jface.viewers.ISelectionProvider; |
| import org.eclipse.jface.viewers.IStructuredSelection; |
| import org.eclipse.swt.dnd.DND; |
| import org.eclipse.swt.dnd.DragSource; |
| import org.eclipse.swt.dnd.DragSourceEvent; |
| import org.eclipse.swt.dnd.Transfer; |
| import org.eclipse.swt.widgets.Control; |
| import org.eclipse.swt.widgets.Shell; |
| import org.eclipse.ui.actions.ReadOnlyStateChecker; |
| import org.eclipse.ui.part.ResourceTransfer; |
| |
| /** |
| * A drag adapter that transfers the current selection as </code> |
| * IResource</code>. Only those elements in the selection are part |
| * of the transfer which can be converted into an <code>IResource |
| * </code>. |
| */ |
| public class ResourceTransferDragAdapter implements TransferDragSourceListener { |
| private final ISelectionProvider provider; |
| |
| /** |
| * Creates a new ResourceTransferDragAdapter for the given selection provider. |
| * |
| * @param provider the selection provider to access the viewer's selection |
| */ |
| public ResourceTransferDragAdapter(ISelectionProvider provider) { |
| super(); |
| this.provider = provider; |
| Assert.isNotNull(provider); |
| } |
| |
| @Override |
| public Transfer getTransfer() { |
| return ResourceTransfer.getInstance(); |
| } |
| |
| @Override |
| public void dragStart(DragSourceEvent event) { |
| IResource[] resources = getSelectedResources(); |
| event.doit = resources.length > 0; |
| } |
| |
| @Override |
| public void dragSetData(DragSourceEvent event) { |
| event.data = getSelectedResources(); |
| } |
| |
| @Override |
| public void dragFinished(DragSourceEvent event) { |
| if (event.doit && event.detail == DND.DROP_MOVE) { |
| IResource[] resources = getSelectedResources(); |
| |
| if (resources.length == 0) |
| return; |
| |
| DragSource dragSource = (DragSource) event.widget; |
| Control control = dragSource.getControl(); |
| Shell shell = control.getShell(); |
| String title = CUIMessages.Drag_move_problem_title; |
| String message = CUIMessages.Drag_move_problem_message; |
| |
| ReadOnlyStateChecker checker = new ReadOnlyStateChecker(shell, title, message); |
| |
| resources = checker.checkReadOnlyResources(resources); |
| |
| // delete the old elements |
| for (int i = 0; i < resources.length; ++i) { |
| try { |
| resources[i].delete(IResource.KEEP_HISTORY | IResource.FORCE, null); |
| } catch (CoreException e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| } |
| |
| private IResource[] getSelectedResources() { |
| List<IResource> resources = Collections.emptyList(); |
| ISelection selection = provider.getSelection(); |
| |
| if (selection instanceof IStructuredSelection) { |
| IStructuredSelection structured = (IStructuredSelection) selection; |
| |
| resources = new ArrayList<>(structured.size()); |
| |
| for (Iterator<?> iterator = structured.iterator(); iterator.hasNext();) { |
| Object element = iterator.next(); |
| IResource resource = null; |
| if (element instanceof IResource) { |
| resource = (IResource) element; |
| } else if (element instanceof IAdaptable) { |
| IAdaptable adaptable = (IAdaptable) element; |
| resource = adaptable.getAdapter(IResource.class); |
| } |
| if (resource != null) { |
| resources.add(resource); |
| } |
| } |
| } |
| |
| IResource[] result = new IResource[resources.size()]; |
| resources.toArray(result); |
| |
| return result; |
| } |
| |
| } |