gitorious.org Git - online-glom:gwt-glom.git/blob - src/main/java/org/glom/web/client/PlaceControllerExt.java

1 /*

3 *

4 * This file is part of GWT-Glom.

5 *

6 * GWT-Glom is free software: you can redistribute it and/or modify it

7 * under the terms of the GNU Lesser General Public License as published by the

8 * Free Software Foundation, either version 3 of the License, or (at your

9 * option) any later version.

10 *

11 * GWT-Glom is distributed in the hope that it will be useful, but WITHOUT

12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License

14 * for more details.

15 *

16 * You should have received a copy of the GNU Lesser General Public License

17 * along with GWT-Glom. If not, see <http://www.gnu.org/licenses/>.

18 */

19

20 package org.glom.web.client;

21

22 import com.google.gwt.place.shared.Place;

23 import com.google.gwt.place.shared.PlaceChangeEvent;

24 import com.google.gwt.place.shared.PlaceController;

25 import com.google.web.bindery.event.shared.EventBus;

26

27 /**

28 * @author Murray Cumming <murrayc@murrayc.com>

29 *

30 * See http://stackoverflow.com/questions/7672895/using-gwts-activities-and-places-can-i-navigate-to-a-previous-page-without-using?rq=1

31 *

32 */

33 public class PlaceControllerExt extends PlaceController {

34

35 private final Place defaultPlace;

36 private Place previousPlace;

37 private Place currentPlace;

38

39 public PlaceControllerExt(EventBus eventBus, Place defaultPlace) {

40 super(eventBus);

41 this.defaultPlace = defaultPlace;

42 eventBus.addHandler(PlaceChangeEvent.TYPE, new PlaceChangeEvent.Handler() {

43

44 public void onPlaceChange(PlaceChangeEvent event) {

45

46 previousPlace = currentPlace;

47 currentPlace = event.getNewPlace();

48 }

49 });

50 }

51

52 public Place getDefaultPlace() {

53 return defaultPlace;

54 }

55

56 /**

57 * Navigate back to the previous Place. If there is no previous place then goto to default place. If there isn't one

58 * of these then it'll go back to the default place as configured when the PlaceHistoryHandler was registered. This

59 * is better than using History#back() as that can have the undesired effect of leaving the web app.

60 */

61 public void previous() {

62

63 if (previousPlace != null) {

64 goTo(previousPlace);

65 } else {

66 goTo(defaultPlace);

67 }

68 }

69 }