1 /*
2  * Copyright 2008 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy of
6  * the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations under
14  * the License.
15  */
16 package com.google.gwt.sample.showcase.client.content.widgets;
17 
18 import com.google.gwt.core.client.GWT;
19 import com.google.gwt.core.client.RunAsyncCallback;
20 import com.google.gwt.event.dom.client.ClickEvent;
21 import com.google.gwt.event.dom.client.ClickHandler;
22 import com.google.gwt.i18n.client.Constants;
23 import com.google.gwt.sample.showcase.client.ContentWidget;
24 import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseData;
25 import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseSource;
26 import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseStyle;
27 import com.google.gwt.user.client.Window;
28 import com.google.gwt.user.client.rpc.AsyncCallback;
29 import com.google.gwt.user.client.ui.Button;
30 import com.google.gwt.user.client.ui.HorizontalPanel;
31 import com.google.gwt.user.client.ui.Widget;
32 
33 /**
34  * Example file.
35  */
36 @ShowcaseStyle(".gwt-Button")
37 public class CwBasicButton extends ContentWidget {
38   /**
39    * The constants used in this Content Widget.
40    */
41   @ShowcaseSource
42   public static interface CwConstants extends Constants {
cwBasicButtonClickMessage()43     String cwBasicButtonClickMessage();
44 
cwBasicButtonDescription()45     String cwBasicButtonDescription();
46 
cwBasicButtonDisabled()47     String cwBasicButtonDisabled();
48 
cwBasicButtonName()49     String cwBasicButtonName();
50 
cwBasicButtonNormal()51     String cwBasicButtonNormal();
52   }
53 
54   /**
55    * An instance of the constants.
56    */
57   @ShowcaseData
58   private final CwConstants constants;
59 
60   /**
61    * Constructor.
62    *
63    * @param constants the constants
64    */
CwBasicButton(CwConstants constants)65   public CwBasicButton(CwConstants constants) {
66     super(constants.cwBasicButtonName(), constants.cwBasicButtonDescription(),
67         true);
68     this.constants = constants;
69   }
70 
71   /**
72    * Initialize this example.
73    */
74   @ShowcaseSource
75   @Override
onInitialize()76   public Widget onInitialize() {
77     // Create a panel to align the widgets
78     HorizontalPanel hPanel = new HorizontalPanel();
79     hPanel.setSpacing(10);
80 
81     // Add a normal button
82     Button normalButton = new Button(
83         constants.cwBasicButtonNormal(), new ClickHandler() {
84           public void onClick(ClickEvent event) {
85             Window.alert(constants.cwBasicButtonClickMessage());
86           }
87         });
88     normalButton.ensureDebugId("cwBasicButton-normal");
89     hPanel.add(normalButton);
90 
91     // Add a disabled button
92     Button disabledButton = new Button(constants.cwBasicButtonDisabled());
93     disabledButton.ensureDebugId("cwBasicButton-disabled");
94     disabledButton.setEnabled(false);
95     hPanel.add(disabledButton);
96 
97     // Return the panel
98     return hPanel;
99   }
100 
101   @Override
asyncOnInitialize(final AsyncCallback<Widget> callback)102   protected void asyncOnInitialize(final AsyncCallback<Widget> callback) {
103     GWT.runAsync(CwBasicButton.class, new RunAsyncCallback() {
104 
105       public void onFailure(Throwable caught) {
106         callback.onFailure(caught);
107       }
108 
109       public void onSuccess() {
110         callback.onSuccess(onInitialize());
111       }
112     });
113   }
114 }
115