/*******************************************************************************
* Copyright (c) 2000, 2017 IBM Corporation 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
*
*******************************************************************************/
package org.eclipse.dltk.internal.ui.scriptview;
import java.lang.reflect.InvocationTargetException;
import java.util.Collections;
import java.util.List;
import org.eclipse.core.resources.IResource;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.dltk.internal.corext.refactoring.reorg.IReorgPolicy.ICopyPolicy;
import org.eclipse.dltk.internal.corext.refactoring.reorg.IReorgPolicy.IMovePolicy;
import org.eclipse.dltk.internal.corext.refactoring.reorg.ReorgMoveStarter;
import org.eclipse.dltk.internal.corext.refactoring.reorg.ReorgPolicyFactory;
import org.eclipse.dltk.internal.corext.refactoring.reorg.ReorgUtils;
import org.eclipse.dltk.internal.ui.dnd.DLTKViewerDropAdapter;
import org.eclipse.dltk.internal.ui.refactoring.RefactoringMessages;
import org.eclipse.dltk.internal.ui.refactoring.reorg.ReorgCopyStarter;
import org.eclipse.dltk.internal.ui.refactoring.reorg.ScriptCopyProcessor;
import org.eclipse.dltk.internal.ui.refactoring.reorg.ScriptMoveProcessor;
import org.eclipse.dltk.ui.util.ExceptionHandler;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.util.TransferDropTargetListener;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.swt.widgets.Shell;
public class SelectionTransferDropAdapter extends DLTKViewerDropAdapter
implements TransferDropTargetListener {
private List fElements;
private ScriptMoveProcessor fMoveProcessor;
private int fCanMoveElements;
private ScriptCopyProcessor fCopyProcessor;
private int fCanCopyElements;
private ISelection fSelection;
public SelectionTransferDropAdapter(StructuredViewer viewer) {
super(viewer);
setScrollEnabled(true);
setExpandEnabled(true);
setSelectionFeedbackEnabled(false);
setFeedbackEnabled(false);
}
// ---- TransferDropTargetListener interface
// ---------------------------------------
@Override
public Transfer getTransfer() {
return LocalSelectionTransfer.getTransfer();
}
@Override
public boolean isEnabled(DropTargetEvent event) {
Object target = event.item != null ? event.item.getData() : null;
if (target == null)
return false;
return target instanceof IModelElement || target instanceof IResource;
}
// ---- Actual DND
// -----------------------------------------------------------------
@Override
public void dragEnter(DropTargetEvent event) {
clear();
super.dragEnter(event);
}
@Override
public void dragLeave(DropTargetEvent event) {
clear();
super.dragLeave(event);
}
private void clear() {
setSelectionFeedbackEnabled(false);
fElements = null;
fSelection = null;
fMoveProcessor = null;
fCanMoveElements = 0;
fCopyProcessor = null;
fCanCopyElements = 0;
}
@Override
public boolean validateDrop(Object target, int operation,
TransferData transferType) {
return determineOperation(target, operation, transferType,
DND.DROP_MOVE | DND.DROP_LINK | DND.DROP_COPY) != DND.DROP_NONE;
}
@Override
protected int determineOperation(Object target, int operation,
TransferData transferType, int operations) {
int result = internalDetermineOperation(target, operation, operations);
if (result == DND.DROP_NONE) {
setSelectionFeedbackEnabled(false);
} else {
setSelectionFeedbackEnabled(true);
}
return result;
}
private int internalDetermineOperation(Object target, int operation,
int operations) {
initializeSelection();
if (target == null)
return DND.DROP_NONE;
// Do not allow to drop on itself, bug 14228
if (getCurrentLocation() == LOCATION_ON) {
IModelElement[] javaElements = ReorgUtils
.getModelElements(fElements);
if (contains(javaElements, target))
return DND.DROP_NONE;
IResource[] resources = ReorgUtils.getResources(fElements);
if (contains(resources, target))
return DND.DROP_NONE;
}
try {
switch (operation) {
case DND.DROP_DEFAULT:
return handleValidateDefault(target, operations);
case DND.DROP_COPY:
return handleValidateCopy(target);
case DND.DROP_MOVE:
return handleValidateMove(target);
}
} catch (ModelException e) {
ExceptionHandler.handle(e,
ScriptMessages.SelectionTransferDropAdapter_error_title,
ScriptMessages.SelectionTransferDropAdapter_error_message);
}
return DND.DROP_NONE;
}
private boolean contains(IResource[] resources, Object target) {
for (int i = 0; i < resources.length; i++) {
if (resources[i].equals(target))
return true;
}
return false;
}
private boolean contains(IModelElement[] elements, Object target) {
for (int i = 0; i < elements.length; i++) {
if (elements[i].equals(target))
return true;
}
return false;
}
protected void initializeSelection() {
if (fElements != null)
return;
ISelection s = LocalSelectionTransfer.getTransfer().getSelection();
if (!(s instanceof IStructuredSelection)) {
fSelection = StructuredSelection.EMPTY;
fElements = Collections.EMPTY_LIST;
return;
}
fSelection = s;
fElements = ((IStructuredSelection) s).toList();
}
protected ISelection getSelection() {
return fSelection;
}
/**
* {@inheritDoc}
*/
@Override
public boolean performDrop(Object data) {
try {
switch (getCurrentOperation()) {
case DND.DROP_MOVE:
handleDropMove(getCurrentTarget());
break;
case DND.DROP_COPY:
handleDropCopy(getCurrentTarget());
break;
}
} catch (ModelException e) {
ExceptionHandler.handle(e,
ScriptMessages.SelectionTransferDropAdapter_error_title,
ScriptMessages.SelectionTransferDropAdapter_error_message);
} catch (InvocationTargetException e) {
ExceptionHandler
.handle(
e,
RefactoringMessages.OpenRefactoringWizardAction_refactoring,
RefactoringMessages.OpenRefactoringWizardAction_exception);
} catch (InterruptedException e) {
// ok
}
// The drag source listener must not perform any operation
// since this drop adapter did the remove of the source even
// if we moved something.
return false;
}
private int handleValidateDefault(Object target, int operations)
throws ModelException {
if ((operations & DND.DROP_MOVE) != 0) {
int result = handleValidateMove(target);
if (result != DND.DROP_NONE)
return result;
}
return handleValidateCopy(target);
}
private int handleValidateMove(Object target) throws ModelException {
if (fMoveProcessor == null) {
IMovePolicy policy = ReorgPolicyFactory.createMovePolicy(ReorgUtils
.getResources(fElements), ReorgUtils
.getModelElements(fElements));
if (policy.canEnable())
fMoveProcessor = new ScriptMoveProcessor(policy);
}
if (!canMoveElements())
return DND.DROP_NONE;
if (fMoveProcessor == null)
return DND.DROP_NONE;
// if (!fMoveProcessor.setDestination(
// ReorgDestinationFactory.createDestination(target,
// getCurrentLocation())).isOK())
// return DND.DROP_NONE;
if (target instanceof IModelElement) {
if (!fMoveProcessor.setDestination((IModelElement) target).isOK()) {
return DND.DROP_NONE;
}
}
if (target instanceof IResource) {
if (!fMoveProcessor.setDestination((IResource) target).isOK()) {
return DND.DROP_NONE;
}
}
return DND.DROP_MOVE;
}
private boolean canMoveElements() {
if (fCanMoveElements == 0) {
fCanMoveElements = 2;
if (fMoveProcessor == null)
fCanMoveElements = 1;
}
return fCanMoveElements == 2;
}
private void handleDropMove(final Object target) throws ModelException,
InvocationTargetException, InterruptedException {
IModelElement[] modelElements = ReorgUtils.getModelElements(fElements);
IResource[] resources = ReorgUtils.getResources(fElements);
ReorgMoveStarter starter = null;
if (target instanceof IResource)
starter = ReorgMoveStarter.create(modelElements, resources,
(IResource) target);
else if (target instanceof IModelElement)
starter = ReorgMoveStarter.create(modelElements, resources,
(IModelElement) target);
if (starter != null)
starter.run(getShell());
}
private int handleValidateCopy(Object target) throws ModelException {
if (fCopyProcessor == null) {
final ICopyPolicy policy = ReorgPolicyFactory.createCopyPolicy(
ReorgUtils.getResources(fElements), ReorgUtils
.getModelElements(fElements));
fCopyProcessor = policy.canEnable() ? new ScriptCopyProcessor(
policy) : null;
}
if (!canCopyElements())
return DND.DROP_NONE;
if (fCopyProcessor == null)
return DND.DROP_NONE;
if (target instanceof IModelElement) {
if (!fCopyProcessor.setDestination((IModelElement) target).isOK()) {
return DND.DROP_NONE;
}
}
if (target instanceof IResource) {
if (!fCopyProcessor.setDestination((IResource) target).isOK()) {
return DND.DROP_NONE;
}
}
// if (!fCopyProcessor.setDestination(
// ReorgDestinationFactory.createDestination(target,
// getCurrentLocation()).getDestination()).isOK())
// return DND.DROP_NONE;
return DND.DROP_COPY;
}
private boolean canCopyElements() {
if (fCanCopyElements == 0) {
fCanCopyElements = 2;
if (fCopyProcessor == null)
fCanCopyElements = 1;
}
return fCanCopyElements == 2;
}
private void handleDropCopy(final Object target) throws ModelException,
InvocationTargetException, InterruptedException {
IModelElement[] modelElements = ReorgUtils.getModelElements(fElements);
IResource[] resources = ReorgUtils.getResources(fElements);
ReorgCopyStarter starter = null;
if (target instanceof IModelElement) {
starter = ReorgCopyStarter.create(modelElements, resources,
(IModelElement) target);
} else if (target instanceof IResource) {
starter = ReorgCopyStarter.create(modelElements, resources,
(IResource) target);
}
if (starter != null)
starter.run(getShell());
}
private Shell getShell() {
return getViewer().getControl().getShell();
}
/**
* {@inheritDoc}
*/
@Override
protected int getCurrentLocation() {
if (getFeedbackEnabled()) {
return super.getCurrentLocation();
} else {
return LOCATION_ON;
}
}
}