| /******************************************************************************* |
| * Copyright (c) 2000, 2023 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * 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.LocalSelectionTransfer; |
| 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.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.getTransfer(); |
| } |
| |
| 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.getTransfer().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.getTransfer().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(); |
| } |
| } |