| /* |
| * Copyright (c) 2012 Eike Stepper (Berlin, Germany) and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Eike Stepper - initial API and implementation |
| */ |
| package org.eclipse.emf.cdo.transfer.ui; |
| |
| import org.eclipse.emf.cdo.transfer.CDOTransfer; |
| import org.eclipse.emf.cdo.transfer.CDOTransferElement; |
| import org.eclipse.emf.cdo.transfer.spi.ui.TransferUIProvider; |
| import org.eclipse.emf.cdo.transfer.spi.ui.TransferUIProvider.Factory; |
| |
| import org.eclipse.net4j.util.container.IManagedContainer; |
| import org.eclipse.net4j.util.container.IPluginContainer; |
| import org.eclipse.net4j.util.ui.dnd.DNDDropAdapter; |
| |
| import org.eclipse.jface.viewers.StructuredViewer; |
| import org.eclipse.swt.dnd.DND; |
| import org.eclipse.swt.dnd.Transfer; |
| import org.eclipse.swt.widgets.Shell; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * A {@link DNDDropAdapter drop adapter} that can {@link #support(StructuredViewer) support} a {@link StructuredViewer viewer} to create and perform |
| * {@link CDOTransfer transfers} of the dragged elements to target {@link CDOTransferElement elements}. |
| * |
| * @author Eike Stepper |
| */ |
| public class TransferDropAdapter extends DNDDropAdapter<Object> |
| { |
| private TransferUIProvider[] uiProviders; |
| |
| public TransferDropAdapter(StructuredViewer viewer) |
| { |
| super(viewer); |
| uiProviders = getUIProviders(); |
| |
| List<Transfer> transfers = new ArrayList<Transfer>(); |
| for (int i = 0; i < uiProviders.length; i++) |
| { |
| TransferUIProvider uiProvider = uiProviders[i]; |
| uiProvider.addSupportedTransfers(transfers); |
| } |
| |
| setTransfers(transfers.toArray(new Transfer[transfers.size()])); |
| } |
| |
| protected IManagedContainer getContainer() |
| { |
| return IPluginContainer.INSTANCE; |
| } |
| |
| protected TransferUIProvider[] getUIProviders() |
| { |
| return Factory.getAll(getContainer()); |
| } |
| |
| @Override |
| protected boolean validateTarget(Object target, int operation) |
| { |
| CDOTransferElement targetElement = getTargetElement(target); |
| if (targetElement != null && targetElement.isDirectory()) |
| { |
| overrideOperation(DND.DROP_COPY); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| @Override |
| protected boolean performDrop(Object data, Object target) |
| { |
| if (data == null) |
| { |
| return false; |
| } |
| |
| final List<CDOTransferElement> sourceElements = getSourceElements(data); |
| if (sourceElements == null || sourceElements.isEmpty()) |
| { |
| return false; |
| } |
| |
| final CDOTransferElement targetElement = getTargetElement(target); |
| if (targetElement == null || !targetElement.isDirectory()) |
| { |
| return false; |
| } |
| |
| Shell shell = getViewer().getControl().getShell(); |
| return TransferDialog.open(shell, sourceElements, targetElement); |
| } |
| |
| protected List<CDOTransferElement> getSourceElements(Object data) |
| { |
| for (int i = 0; i < uiProviders.length; i++) |
| { |
| TransferUIProvider uiProvider = uiProviders[i]; |
| |
| List<CDOTransferElement> elements = uiProvider.convertTransferData(data); |
| if (elements != null) |
| { |
| return elements; |
| } |
| } |
| |
| return null; |
| } |
| |
| protected CDOTransferElement getTargetElement(Object target) |
| { |
| for (int i = 0; i < uiProviders.length; i++) |
| { |
| TransferUIProvider uiProvider = uiProviders[i]; |
| |
| CDOTransferElement element = uiProvider.convertTransferTarget(target); |
| if (element != null) |
| { |
| return element; |
| } |
| } |
| |
| return null; |
| } |
| |
| public static TransferDropAdapter support(StructuredViewer viewer) |
| { |
| TransferDropAdapter dropAdapter = new TransferDropAdapter(viewer); |
| Transfer[] transfers = dropAdapter.getTransfers(); |
| viewer.addDropSupport(DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_DEFAULT, transfers, dropAdapter); |
| return dropAdapter; |
| } |
| } |