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/*****************************************************************************
* Copyright (c) 2012, 2014 CEA LIST 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:
* Vincent Lorenzo (CEA LIST) vincent.lorenzo@cea.fr - Initial API and implementation
* Christian W. Damus (CEA) - bug 430880
*
*****************************************************************************/
package org.eclipse.papyrus.infra.nattable.listener;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.UnexecutableCommand;
import org.eclipse.emf.edit.ui.dnd.LocalTransfer;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.core.services.ServicesRegistry;
import org.eclipse.papyrus.infra.emf.utils.ServiceUtilsForEObject;
import org.eclipse.papyrus.infra.nattable.Activator;
import org.eclipse.papyrus.infra.nattable.manager.cell.CellManagerFactory;
import org.eclipse.papyrus.infra.nattable.manager.table.INattableModelManager;
import org.eclipse.papyrus.infra.nattable.selection.ISelectionExtractor;
import org.eclipse.papyrus.infra.nattable.utils.LocationValue;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.DropTargetListener;
import org.eclipse.swt.graphics.Point;
/**
*
* This listener allow to manage the drop inside the table
*
*/
public class NatTableDropListener implements DropTargetListener {
/**
* the table manager
*/
private final INattableModelManager manager;
private final ISelectionExtractor selectionExtractor;
/**
* the location value to use to drop the elements
*/
private LocationValue dropKindValue;
/**
*
* Constructor.
*
* @param manager
* the table manager
* @param selectionExtractor
*/
public NatTableDropListener(final INattableModelManager manager, ISelectionExtractor selectionExtractor) {
this.manager = manager;
this.selectionExtractor = selectionExtractor;
}
/**
*
* @see org.eclipse.swt.dnd.DropTargetListener#dragEnter(org.eclipse.swt.dnd.DropTargetEvent)
*
* @param event
*/
@Override
public void dragEnter(final DropTargetEvent event) {
validateDropEvent(event);
}
protected void validateDropEvent(final DropTargetEvent event) {
event.operations = DND.DROP_COPY | DND.DROP_MOVE;
// Move and Link semantics don't make sense for tables which, like diagrams, are visualizations
// of objects also visualized in other places (such as the Model Explorer)
event.detail = DND.DROP_COPY;
}
/**
*
* @see org.eclipse.swt.dnd.DropTargetListener#dragLeave(org.eclipse.swt.dnd.DropTargetEvent)
*
* @param event
*/
@Override
public void dragLeave(final DropTargetEvent event) {
// nothing to do
}
/**
*
* @see org.eclipse.swt.dnd.DropTargetListener#dragOperationChanged(org.eclipse.swt.dnd.DropTargetEvent)
*
* @param event
*/
@Override
public void dragOperationChanged(final DropTargetEvent event) {
validateDropEvent(event);
}
/**
*
* @see org.eclipse.swt.dnd.DropTargetListener#dragOver(org.eclipse.swt.dnd.DropTargetEvent)
*
* @param event
*/
@Override
public void dragOver(final DropTargetEvent event) {
validateDropEvent(event);
this.dropKindValue = null;
final List<Object> droppedElements = getDroppedObjects(event);
if (droppedElements.isEmpty()) {
return; // Nothing to do
}
this.dropKindValue = this.manager.getLocationInTheTable(new Point(event.x, event.y));
int drop = DND.DROP_NONE;
switch (this.dropKindValue.getKind()) {
case AFTER_COLUMN_HEADER:
if (this.manager.canDropColumnsElement(droppedElements)) {
drop = event.detail;
}
break;
case AFTER_ROW_HEADER:
if (this.manager.canDropRowElement(droppedElements)) {
drop = event.detail;
}
break;
case COLUMN_HEADER:
if (this.manager.canInsertColumns(droppedElements, this.dropKindValue.getColumnIndex())) {
drop = event.detail;
}
break;
case ROW_HEADER:
if (this.manager.canInsertRow(droppedElements, this.dropKindValue.getRowIndex())) {
drop = event.detail;
}
break;
case CELL:
int rowIndex = this.dropKindValue.getRowIndex();
int columnIndex = this.dropKindValue.getColumnIndex();
final Object rowElement = this.manager.getRowElement(rowIndex);
final Object columnElement = this.manager.getColumnElement(columnIndex);
if (CellManagerFactory.INSTANCE.isCellEditable(columnElement, rowElement, this.manager)) {
final TransactionalEditingDomain domain = getEditingDomain();
final Command cmd = getDropSetValueCommand(domain, droppedElements);
if (cmd!=null && cmd.canExecute()) {
drop = event.detail;
}
}
break;
case UNKNOWN:
drop = DND.DROP_NONE;
break;
default:
drop = DND.DROP_NONE;
break;
}
event.detail = drop;
}
protected List<Object> getDroppedObjects(DropTargetEvent event) {
final LocalTransfer localTransfer = LocalTransfer.getInstance();
final Object data = localTransfer.nativeToJava(event.currentDataType);
IStructuredSelection structuredSelection = null;
if (data instanceof IStructuredSelection) {
structuredSelection = (IStructuredSelection) data;
} else if (LocalSelectionTransfer.getTransfer().isSupportedType(event.currentDataType)) {
// Try the local selection transfer
ISelection selection = LocalSelectionTransfer.getTransfer().getSelection();
if (selection instanceof IStructuredSelection) {
structuredSelection = (IStructuredSelection) selection;
}
}
if (structuredSelection == null) {
return Collections.emptyList();
}
return new ArrayList<Object>(extractSelectedObjects(structuredSelection));
}
protected Collection<?> extractSelectedObjects(IStructuredSelection structuredSelection) {
return this.selectionExtractor.extractSelectedObjects(structuredSelection);
}
/**
*
* @param droppedElements
* the dropped elements
* @return
* the command to set the value in the selected cell
*/
private Command getDropSetValueCommand(final TransactionalEditingDomain domain, final List<Object> droppedElements) {
int rowIndex = this.dropKindValue.getRowIndex();
int columnIndex = this.dropKindValue.getColumnIndex();
final Object rowElement = this.manager.getRowElement(rowIndex);
final Object columnElement = this.manager.getColumnElement(columnIndex);
if (CellManagerFactory.INSTANCE.isCellEditable(columnElement, rowElement, this.manager)) {
Object newValue = null;
final Object currentValue = CellManagerFactory.INSTANCE.getCrossValueIgnoringProblems(columnElement, rowElement, this.manager);
if (currentValue instanceof Collection<?>) {
// the dropped elements will be added to the current Value in case of multivalued cell
final Collection<Object> tmpNewValue = new ArrayList<Object>();
tmpNewValue.addAll((Collection<?>) currentValue);
tmpNewValue.addAll(droppedElements);
newValue = tmpNewValue;
} else if (droppedElements.size() == 1) {
newValue = droppedElements.get(0);
} else {
newValue = droppedElements;
}
final Command cmd = CellManagerFactory.INSTANCE.getSetCellValueCommand(domain, columnElement, rowElement, newValue, manager);
return cmd;
}
return UnexecutableCommand.INSTANCE;
}
/**
*
* @see org.eclipse.swt.dnd.DropTargetListener#drop(org.eclipse.swt.dnd.DropTargetEvent)
*
* @param event
*/
@Override
public void drop(final DropTargetEvent event) {
// we drop the elements into the table
final List<Object> droppedElements = getDroppedObjects(event);
if (!droppedElements.isEmpty()) {
if (this.dropKindValue != null) {
switch (this.dropKindValue.getKind()) {
case AFTER_COLUMN_HEADER:
this.manager.addColumns(droppedElements);
break;
case AFTER_ROW_HEADER:
this.manager.addRows(droppedElements);
break;
case COLUMN_HEADER:
this.manager.insertColumns(droppedElements, this.dropKindValue.getColumnIndex());
break;
case ROW_HEADER:
this.manager.insertRows(droppedElements, this.dropKindValue.getRowIndex());
break;
case CELL:
final TransactionalEditingDomain domain = getEditingDomain();
final Command cmd = getDropSetValueCommand(domain, droppedElements);
if (cmd!=null && cmd.canExecute()) {
domain.getCommandStack().execute(cmd);
}
break;
case UNKNOWN:
break;
default:
break;
}
}
}
this.dropKindValue = null;
}
@Override
public void dropAccept(final DropTargetEvent event) {
// nothing to do
}
/**
*
* @return
* the Transactional Editing Domain to use to edit the model
*/
private TransactionalEditingDomain getEditingDomain() {
TransactionalEditingDomain domain = null;
ServicesRegistry registry = null;
try {
registry = ServiceUtilsForEObject.getInstance().getServiceRegistry(this.manager.getTable().getContext());
} catch (ServiceException e) {
Activator.log.error(e);
}
if (registry != null) {
try {
domain = registry.getService(TransactionalEditingDomain.class);
} catch (ServiceException e) {
Activator.log.error(e);
}
}
return domain;
}
}
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