Add a "Back to List" link when at the DetailsPlace.
[online-glom:gwt-glom.git] / src / main / java / org / glom / web / client / activity / TableSelectionActivity.java
1 /*
2  * Copyright (C) 2011 Openismus GmbH
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.activity;
21
22 import org.glom.web.client.ClientFactory;
23 import org.glom.web.client.OnlineGlomServiceAsync;
24 import org.glom.web.client.event.TableChangeEvent;
25 import org.glom.web.client.place.DetailsPlace;
26 import org.glom.web.client.place.HasSelectableTablePlace;
27 import org.glom.web.client.place.ListPlace;
28 import org.glom.web.client.ui.TableSelectionView;
29 import org.glom.web.shared.GlomDocument;
30
31 import com.google.gwt.activity.shared.AbstractActivity;
32 import com.google.gwt.event.dom.client.ChangeEvent;
33 import com.google.gwt.event.dom.client.ChangeHandler;
34 import com.google.gwt.event.dom.client.HasChangeHandlers;
35 import com.google.gwt.event.shared.EventBus;
36 import com.google.gwt.event.shared.HandlerRegistration;
37 import com.google.gwt.place.shared.Place;
38 import com.google.gwt.user.client.Window;
39 import com.google.gwt.user.client.rpc.AsyncCallback;
40 import com.google.gwt.user.client.ui.AcceptsOneWidget;
41
42 /**
43  * @author Ben Konrath <ben@bagu.org>
44  * 
45  */
46 public class TableSelectionActivity extends AbstractActivity implements TableSelectionView.Presenter {
47         private final ClientFactory clientFactory;
48         private String documentTitle;
49         private HandlerRegistration changeHandlerRegistration = null;
50
51         // This activity isn't properly configured until the List or Details Place is set with the appropriate methods
52         public TableSelectionActivity(ClientFactory clientFactory) {
53                 this.clientFactory = clientFactory;
54         }
55
56         /**
57          * Invoked by the ActivityManager to start a new Activity
58          */
59         @Override
60         public void start(AcceptsOneWidget containerWidget, final EventBus eventBus) {
61                 Window.setTitle("Online Glom - " + documentTitle);
62
63                 final TableSelectionView tableSelectionView = clientFactory.getTableSelectionView();
64                 tableSelectionView.setPresenter(this);
65
66                 HasChangeHandlers tableSelector = tableSelectionView.getTableSelector();
67
68                 changeHandlerRegistration = tableSelector.addChangeHandler(new ChangeHandler() {
69                         @Override
70                         public void onChange(ChangeEvent event) {
71                                 eventBus.fireEvent(new TableChangeEvent(tableSelectionView.getSelectedTable()));
72                         }
73                 });
74
75                 // get the table names, table titles and default table index for the current document
76                 AsyncCallback<GlomDocument> callback = new AsyncCallback<GlomDocument>() {
77                         public void onFailure(Throwable caught) {
78                                 // FIXME: need to deal with failure
79                                 System.out.println("AsyncCallback Failed: OnlineGlomService.getGlomDocument()");
80                         }
81
82                         public void onSuccess(GlomDocument result) {
83                                 tableSelectionView.setTableSelection(result.getTableNames(), result.getTableTitles());
84                                 tableSelectionView.setTableSelectedIndex(result.getDefaultTableIndex());
85                         }
86                 };
87                 OnlineGlomServiceAsync.Util.getInstance().getGlomDocument(documentTitle, callback);
88
89                 // we're done, set the widget
90                 containerWidget.setWidget(tableSelectionView.asWidget());
91         }
92
93         public void setPlace(HasSelectableTablePlace place) {
94                 this.documentTitle = place.getDocumentTitle();
95                 TableSelectionView tableSelectionView = clientFactory.getTableSelectionView();
96
97                 // show the 'back to list' link if we're at a DetailsPlace, hide it otherwise
98                 if (place instanceof DetailsPlace) {
99                         tableSelectionView.setBackLinkVisible(true);
100                         tableSelectionView.setBackLink(documentTitle);
101                 } else if (place instanceof ListPlace) {
102                         tableSelectionView.setBackLinkVisible(false);
103                 }
104         }
105
106         private void clearView() {
107                 clientFactory.getTableSelectionView().clear();
108                 if (changeHandlerRegistration != null) {
109                         changeHandlerRegistration.removeHandler();
110                         changeHandlerRegistration = null;
111                 }
112         }
113
114         /*
115          * (non-Javadoc)
116          * 
117          * @see com.google.gwt.activity.shared.AbstractActivity#onCancel()
118          */
119         @Override
120         public void onCancel() {
121                 clearView();
122         }
123
124         /*
125          * (non-Javadoc)
126          * 
127          * @see com.google.gwt.activity.shared.AbstractActivity#onStop()
128          */
129         @Override
130         public void onStop() {
131                 clearView();
132         }
133
134         /*
135          * (non-Javadoc)
136          * 
137          * @see org.glom.web.client.ui.TableSelectionView.Presenter#goTo(com.google.gwt.place.shared.Place)
138          */
139         @Override
140         public void goTo(Place place) {
141                 clientFactory.getPlaceController().goTo(place);
142         }
143
144 }