/*
* Copyright (c) 2014, grossmann
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the jo-widgets.org nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
package org.jowidgets.spi.impl.swt.common.dnd;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DragSourceListener;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.widgets.Control;
import org.jowidgets.common.dnd.DropAction;
import org.jowidgets.spi.clipboard.TransferContainer;
import org.jowidgets.spi.clipboard.TransferObject;
import org.jowidgets.spi.clipboard.TransferTypeSpi;
import org.jowidgets.spi.dnd.IDragSourceSpi;
import org.jowidgets.spi.impl.dnd.AbstractDragSourceObservableSpi;
import org.jowidgets.spi.impl.dnd.DragDataResponseSpiImpl;
import org.jowidgets.spi.impl.swt.common.clipboard.ObjectTransfer;
import org.jowidgets.spi.impl.types.VetoHolder;
import org.jowidgets.util.Assert;
import org.jowidgets.util.EmptyCheck;
public final class SwtDragSource extends AbstractDragSourceObservableSpi implements IDragSourceSpi {
private static final Transfer TEXT_TRANSFER = TextTransfer.getInstance();
private static final Transfer OBJECT_TRANSFER = ObjectTransfer.getInstance();
private final Control control;
private Collection<TransferTypeSpi> supportedTypes;
private Set<DropAction> actions;
private DragSource dragSource;
public SwtDragSource(final Control control) {
Assert.paramNotNull(control, "control");
this.control = control;
}
@Override
public void setTransferTypes(final Collection<TransferTypeSpi> supportedTypes) {
this.supportedTypes = new LinkedList<TransferTypeSpi>(supportedTypes);
if (dragSource != null) {
dragSource.setTransfer(DragDropUtil.createTransfers(supportedTypes));
}
createDragSourceIfNecessary();
}
@Override
public void setActions(final Set<DropAction> actions) {
if (dragSource != null) {
dragSource.dispose();
dragSource = null;
}
this.actions = new HashSet<DropAction>(actions);
createDragSourceIfNecessary();
}
@Override
protected void setActive(final boolean active) {
if (active) {
createDragSourceIfNecessary();
}
else {
if (dragSource != null) {
dragSource.dispose();
dragSource = null;
}
}
}
@Override
public boolean isActive() {
return super.isActive();
}
private void createDragSourceIfNecessary() {
if (dragSource == null && isActive() && !EmptyCheck.isEmpty(actions) && !EmptyCheck.isEmpty(supportedTypes)) {
this.dragSource = new DragSource(control, DragDropUtil.createOperations(actions));
dragSource.setTransfer(DragDropUtil.createTransfers(supportedTypes));
dragSource.addDragListener(new DragSourceListenerImpl());
}
}
private final class DragSourceListenerImpl implements DragSourceListener {
@Override
public void dragStart(final DragSourceEvent event) {
final VetoHolder veto = new VetoHolder();
fireDragStart(event.x, event.y, veto);
if (veto.hasVeto()) {
event.doit = false;
}
}
@Override
public void dragSetData(final DragSourceEvent event) {
if (TEXT_TRANSFER.isSupportedType(event.dataType)) {
final TransferTypeSpi transferType = DragDropUtil.getStringTransferType(supportedTypes);
if (transferType != null) {
final DragDataResponseSpiImpl dragData = new DragDataResponseSpiImpl();
final VetoHolder veto = new VetoHolder();
fireDragSetData(event.x, event.y, veto, transferType, dragData);
if (veto.hasVeto()) {
event.doit = false;
}
else {
event.data = dragData.getData();
}
}
else {
event.doit = false;
}
}
else if (OBJECT_TRANSFER.isSupportedType(event.dataType)) {
final List<TransferObject> transferObjectsList = new LinkedList<TransferObject>();
for (final TransferTypeSpi transferType : DragDropUtil.getTransferObjectTypes(supportedTypes)) {
final DragDataResponseSpiImpl dragData = new DragDataResponseSpiImpl();
final VetoHolder veto = new VetoHolder();
fireDragSetData(event.x, event.y, veto, transferType, dragData);
if (!veto.hasVeto()) {
transferObjectsList.add(new TransferObject(transferType, dragData.getData()));
}
}
if (!transferObjectsList.isEmpty()) {
event.data = new TransferContainer(transferObjectsList);
}
else {
event.doit = false;
}
}
else {
event.doit = false;
}
}
@Override
public void dragFinished(final DragSourceEvent event) {
fireDragFinished(event.x, event.y, DragDropUtil.getDropAction(event.detail));
}
}
}