Use a custom PlaceController to go to the previous page after login.

[online-glom:gwt-glom.git] / src / main / java / org / glom / web / client / PlaceControllerExt.java

/*
 * Copyright (C) 2012 Openismus GmbH
 *
 * This file is part of GWT-Glom.
 *
 * GWT-Glom is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * GWT-Glom is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with GWT-Glom.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.glom.web.client;

import com.google.gwt.place.shared.Place;
import com.google.gwt.place.shared.PlaceChangeEvent;
import com.google.gwt.place.shared.PlaceController;
import com.google.web.bindery.event.shared.EventBus;

/**
 * @author Murray Cumming <murrayc@murrayc.com>
 * 
 */
public class PlaceControllerExt extends PlaceController {

        private final Place defaultPlace;
        private Place previousPlace;
        private Place currentPlace;

        public PlaceControllerExt(EventBus eventBus, Place defaultPlace) {
                super(eventBus);
                this.defaultPlace = defaultPlace;
                eventBus.addHandler(PlaceChangeEvent.TYPE, new PlaceChangeEvent.Handler() {

                        public void onPlaceChange(PlaceChangeEvent event) {

                                previousPlace = currentPlace;
                                currentPlace = event.getNewPlace();
                        }
                });
        }
        
        public Place getDefaultPlace() {
                return defaultPlace;
        }

        /**
         * Navigate back to the previous Place. If there is no previous place then goto to default place. If there isn't one
         * of these then it'll go back to the default place as configured when the PlaceHistoryHandler was registered. This
         * is better than using History#back() as that can have the undesired effect of leaving the web app.
         */
        public void previous() {

                if (previousPlace != null) {
                        goTo(previousPlace);
                } else {
                        goTo(defaultPlace);
                }
        }
}