/*******************************************************************************
* Copyright (c) 2000, 2008 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
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.jsdt.internal.ui.packageview;
import java.lang.reflect.InvocationTargetException;
import java.util.List;
import org.eclipse.core.resources.IResource;
import org.eclipse.jface.util.TransferDropTargetListener;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
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.widgets.Shell;
import org.eclipse.ui.views.navigator.LocalSelectionTransfer;
import org.eclipse.wst.jsdt.core.IJavaScriptElement;
import org.eclipse.wst.jsdt.core.JavaScriptModelException;
import org.eclipse.wst.jsdt.internal.corext.refactoring.reorg.JavaCopyProcessor;
import org.eclipse.wst.jsdt.internal.corext.refactoring.reorg.JavaMoveProcessor;
import org.eclipse.wst.jsdt.internal.corext.refactoring.reorg.ReorgPolicyFactory;
import org.eclipse.wst.jsdt.internal.corext.refactoring.reorg.ReorgUtils;
import org.eclipse.wst.jsdt.internal.corext.refactoring.reorg.IReorgPolicy.ICopyPolicy;
import org.eclipse.wst.jsdt.internal.corext.refactoring.reorg.IReorgPolicy.IMovePolicy;
import org.eclipse.wst.jsdt.internal.ui.dnd.JdtViewerDropAdapter;
import org.eclipse.wst.jsdt.internal.ui.refactoring.RefactoringMessages;
import org.eclipse.wst.jsdt.internal.ui.refactoring.reorg.ReorgCopyStarter;
import org.eclipse.wst.jsdt.internal.ui.refactoring.reorg.ReorgMoveStarter;
import org.eclipse.wst.jsdt.internal.ui.util.ExceptionHandler;
public class SelectionTransferDropAdapter extends JdtViewerDropAdapter implements TransferDropTargetListener {
private List fElements;
private JavaMoveProcessor fMoveProcessor;
private int fCanMoveElements;
private JavaCopyProcessor fCopyProcessor;
private int fCanCopyElements;
private ISelection fSelection;
private static final long DROP_TIME_DIFF_TRESHOLD= 150;
public SelectionTransferDropAdapter(StructuredViewer viewer) {
super(viewer, DND.FEEDBACK_SCROLL | DND.FEEDBACK_EXPAND);
}
//---- TransferDropTargetListener interface ---------------------------------------
public Transfer getTransfer() {
return LocalSelectionTransfer.getInstance();
}
public boolean isEnabled(DropTargetEvent event) {
Object target= event.item != null ? event.item.getData() : null;
if (target == null)
return false;
return target instanceof IJavaScriptElement || target instanceof IResource;
}
//---- Actual DND -----------------------------------------------------------------
public void dragEnter(DropTargetEvent event) {
clear();
super.dragEnter(event);
}
public void dragLeave(DropTargetEvent event) {
clear();
super.dragLeave(event);
}
private void clear() {
fElements= null;
fSelection= null;
fMoveProcessor= null;
fCanMoveElements= 0;
fCopyProcessor= null;
fCanCopyElements= 0;
}
public void validateDrop(Object target, DropTargetEvent event, int operation) {
event.detail= DND.DROP_NONE;
if (tooFast(event))
return;
initializeSelection();
try {
switch(operation) {
case DND.DROP_DEFAULT: event.detail= handleValidateDefault(target, event); break;
case DND.DROP_COPY: event.detail= handleValidateCopy(target, event); break;
case DND.DROP_MOVE: event.detail= handleValidateMove(target, event); break;
}
} catch (JavaScriptModelException e){
ExceptionHandler.handle(e, PackagesMessages.SelectionTransferDropAdapter_error_title, PackagesMessages.SelectionTransferDropAdapter_error_message);
event.detail= DND.DROP_NONE;
}
}
protected void initializeSelection(){
if (fElements != null)
return;
ISelection s= LocalSelectionTransfer.getInstance().getSelection();
if (!(s instanceof IStructuredSelection))
return;
fSelection= s;
fElements= ((IStructuredSelection)s).toList();
}
protected ISelection getSelection(){
return fSelection;
}
private boolean tooFast(DropTargetEvent event) {
return Math.abs(LocalSelectionTransfer.getInstance().getSelectionSetTime() - (event.time & 0xFFFFFFFFL)) < DROP_TIME_DIFF_TRESHOLD;
}
public void drop(Object target, DropTargetEvent event) {
try{
switch(event.detail) {
case DND.DROP_MOVE: handleDropMove(target, event); break;
case DND.DROP_COPY: handleDropCopy(target, event); break;
}
} catch (JavaScriptModelException e){
ExceptionHandler.handle(e, PackagesMessages.SelectionTransferDropAdapter_error_title, PackagesMessages.SelectionTransferDropAdapter_error_message);
} catch(InvocationTargetException e) {
ExceptionHandler.handle(e, RefactoringMessages.OpenRefactoringWizardAction_refactoring, RefactoringMessages.OpenRefactoringWizardAction_exception);
} catch (InterruptedException e) {
//ok
} finally {
// The drag source listener must not perform any operation
// since this drop adapter did the remove of the source even
// if we moved something.
event.detail= DND.DROP_NONE;
}
}
private int handleValidateDefault(Object target, DropTargetEvent event) throws JavaScriptModelException{
if (target == null)
return DND.DROP_NONE;
if ((event.operations & DND.DROP_MOVE) != 0) {
return handleValidateMove(target, event);
}
if ((event.operations & DND.DROP_COPY) != 0) {
return handleValidateCopy(target, event);
}
return DND.DROP_NONE;
}
private int handleValidateMove(Object target, DropTargetEvent event) throws JavaScriptModelException{
if (target == null)
return DND.DROP_NONE;
if (fMoveProcessor == null) {
IMovePolicy policy= ReorgPolicyFactory.createMovePolicy(ReorgUtils.getResources(fElements), ReorgUtils.getJavaElements(fElements));
if (policy.canEnable())
fMoveProcessor= new JavaMoveProcessor(policy);
}
if (!canMoveElements())
return DND.DROP_NONE;
if (target instanceof IResource && fMoveProcessor != null && fMoveProcessor.setDestination((IResource)target).isOK())
return DND.DROP_MOVE;
else if (target instanceof IJavaScriptElement && fMoveProcessor != null && fMoveProcessor.setDestination((IJavaScriptElement)target).isOK())
return DND.DROP_MOVE;
else
return DND.DROP_NONE;
}
private boolean canMoveElements() {
if (fCanMoveElements == 0) {
fCanMoveElements= 2;
if (fMoveProcessor == null)
fCanMoveElements= 1;
}
return fCanMoveElements == 2;
}
private void handleDropMove(final Object target, DropTargetEvent event) throws JavaScriptModelException, InvocationTargetException, InterruptedException{
IJavaScriptElement[] javaElements= ReorgUtils.getJavaElements(fElements);
IResource[] resources= ReorgUtils.getResources(fElements);
ReorgMoveStarter starter= null;
if (target instanceof IResource)
starter= ReorgMoveStarter.create(javaElements, resources, (IResource)target);
else if (target instanceof IJavaScriptElement)
starter= ReorgMoveStarter.create(javaElements, resources, (IJavaScriptElement)target);
if (starter != null)
starter.run(getShell());
}
private int handleValidateCopy(Object target, DropTargetEvent event) throws JavaScriptModelException{
if (fCopyProcessor == null) {
final ICopyPolicy policy= ReorgPolicyFactory.createCopyPolicy(ReorgUtils.getResources(fElements), ReorgUtils.getJavaElements(fElements));
fCopyProcessor= policy.canEnable() ? new JavaCopyProcessor(policy) : null;
}
if (!canCopyElements())
return DND.DROP_NONE;
if (target instanceof IResource && fCopyProcessor != null && fCopyProcessor.setDestination((IResource)target).isOK())
return DND.DROP_COPY;
else if (target instanceof IJavaScriptElement && fCopyProcessor != null && fCopyProcessor.setDestination((IJavaScriptElement)target).isOK())
return DND.DROP_COPY;
else
return DND.DROP_NONE;
}
private boolean canCopyElements() {
if (fCanCopyElements == 0) {
fCanCopyElements= 2;
if (fCopyProcessor == null)
fCanCopyElements= 1;
}
return fCanCopyElements == 2;
}
private void handleDropCopy(final Object target, DropTargetEvent event) throws JavaScriptModelException, InvocationTargetException, InterruptedException{
IJavaScriptElement[] javaElements= ReorgUtils.getJavaElements(fElements);
IResource[] resources= ReorgUtils.getResources(fElements);
ReorgCopyStarter starter= null;
if (target instanceof IResource)
starter= ReorgCopyStarter.create(javaElements, resources, (IResource)target);
else if (target instanceof IJavaScriptElement)
starter= ReorgCopyStarter.create(javaElements, resources, (IJavaScriptElement)target);
if (starter != null)
starter.run(getShell());
}
private Shell getShell() {
return getViewer().getControl().getShell();
}
}