+++ /dev/null
-/*******************************************************************************
- * Copyright (c) 2000, 2003 IBM Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Common Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/cpl-v10.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- *******************************************************************************/
-package net.sourceforge.phpdt.internal.ui.dnd;
-
-//incastrix
-//import org.eclipse.jface.text.Assert;
-import org.eclipse.core.runtime.Assert;
-import org.eclipse.swt.dnd.DropTargetEvent;
-import org.eclipse.swt.dnd.DropTargetListener;
-import org.eclipse.swt.dnd.TransferData;
-
-/**
- * A delegating drop adapter negotiates between a set of
- * <code>TransferDropTargetListener</code>s On <code>dragEnter</code> the
- * adapter determines the listener to be used for any further <code>drag*</code>
- * callback.
- */
-public class DelegatingDropAdapter implements DropTargetListener {
-
- private TransferDropTargetListener[] fListeners;
-
- private TransferDropTargetListener fChosenListener;
-
- /**
- * Creates a new delegating drop adapter.
- *
- * @param listeners
- * an array of potential listeners
- */
- public DelegatingDropAdapter(TransferDropTargetListener[] listeners) {
- fListeners = listeners;
- Assert.isNotNull(listeners);
- }
-
- /*
- * non Java-doc
- *
- * @see DropTargetListener
- */
- public void dragEnter(DropTargetEvent event) {
- fChosenListener = null;
- event.currentDataType = selectPreferredListener(event.dataTypes);
- if (fChosenListener != null)
- fChosenListener.dragEnter(event);
- }
-
- /*
- * non Java-doc
- *
- * @see DropTargetListener
- */
- public void dragLeave(DropTargetEvent event) {
- if (fChosenListener != null)
- fChosenListener.dragLeave(event);
- }
-
- /*
- * non Java-doc
- *
- * @see DropTargetListener
- */
- public void dragOperationChanged(DropTargetEvent event) {
- if (fChosenListener != null)
- fChosenListener.dragOperationChanged(event);
- }
-
- /*
- * non Java-doc
- *
- * @see DropTargetListener
- */
- public void dragOver(DropTargetEvent event) {
- if (fChosenListener != null)
- fChosenListener.dragOver(event);
- }
-
- /*
- * non Java-doc
- *
- * @see DropTargetListener
- */
- public void drop(DropTargetEvent event) {
- if (fChosenListener != null)
- fChosenListener.drop(event);
- fChosenListener = null;
- }
-
- /*
- * non Java-doc
- *
- * @see DropTargetListener
- */
- public void dropAccept(DropTargetEvent event) {
- if (fChosenListener != null)
- fChosenListener.dropAccept(event);
- }
-
- private TransferData selectPreferredListener(TransferData[] dataTypes) {
- for (int i = 0; i < fListeners.length; i++) {
- TransferData data = computeTransferData(dataTypes, fListeners[i]);
- if (data != null)
- return data;
- }
- return null;
- }
-
- private TransferData computeTransferData(TransferData[] dataTypes,
- TransferDropTargetListener listener) {
- for (int i = 0; i < dataTypes.length; i++) {
- if (listener.getTransfer().isSupportedType(dataTypes[i])) {
- fChosenListener = listener;
- return dataTypes[i];
- }
- }
- return null;
- }
-}