2 * Copyright (C) 2008 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.web.generator.client;
19 import com.google.gwt.core.client.EntryPoint;
20 import com.google.gwt.dom.client.Element;
21 import com.google.gwt.http.client.URL;
22 import com.google.gwt.user.client.DOM;
23 import com.google.gwt.user.client.ui.Button;
24 import com.google.gwt.user.client.ui.ChangeListener;
25 import com.google.gwt.user.client.ui.ClickListener;
26 import com.google.gwt.user.client.ui.Grid;
27 import com.google.gwt.user.client.ui.HTML;
28 import com.google.gwt.user.client.ui.HorizontalPanel;
29 import com.google.gwt.user.client.ui.Image;
30 import com.google.gwt.user.client.ui.ListBox;
31 import com.google.gwt.user.client.ui.RootPanel;
32 import com.google.gwt.user.client.ui.SimplePanel;
33 import com.google.gwt.user.client.ui.TextBox;
34 import com.google.gwt.user.client.ui.VerticalPanel;
35 import com.google.gwt.user.client.ui.Widget;
36 import com.google.gwt.user.client.ui.HTMLTable.CellFormatter;
38 import java.util.ArrayList;
39 import java.util.List;
42 * Entry point classes define <code>onModuleLoad()</code>. Setup the page, and loads
43 * all different generators.
45 * @author Yohann Coppel
47 public class Generator implements EntryPoint {
48 // public static final StringConstants S = GWT.create(StringConstants.class);
49 private final List<GeneratorSource> generators = new ArrayList<GeneratorSource>();
50 ListBox genList = new ListBox();
51 ListBox sizeList = new ListBox();
52 Image result = new Image("");//http://chart.apis.google.com/chart?cht=qr&chs=300x300&chl=http://google.com");
53 Grid topPanel = new Grid(5, 1);
54 GeneratorSource selectedGenerator = null;
55 private Button generateButton;
56 VerticalPanel rightPanel = new VerticalPanel();
57 TextBox urlResult = new TextBox();
58 HTML downloadText = new HTML("<a href=\"\" id=\"downloadlink\" >Download</a> or embed with this URL:");
59 //Element errorElement = null;
61 public void onModuleLoad() {
64 HorizontalPanel mainPanel = new HorizontalPanel();
66 topPanel.getElement().setId("leftpanel");
67 Widget leftPanel = topPanel;
69 mainPanel.add(leftPanel);
71 SimplePanel div = new SimplePanel();
72 SimplePanel div2 = new SimplePanel();
74 div2.getElement().setId("innerresult");
76 div.getElement().setId("imageresult");
78 urlResult.getElement().setId("urlresult");
79 downloadText.getElement().setId("downloadText");
81 rightPanel.add(downloadText);
82 rightPanel.add(urlResult);
83 mainPanel.add(rightPanel);
84 mainPanel.getElement().setId("mainpanel");
85 RootPanel.get("ui").add(mainPanel);
86 //RootPanel.get().add(output);
87 //output.setHeight("200px");
88 //output.setWidth("500px");
93 private void setWidget(int id) {
94 if (id >= 0 && id < generators.size()) {
95 topPanel.setWidget(1, 0, generators.get(id).getWidget());
96 genList.setSelectedIndex(id);
97 selectedGenerator = generators.get(id);
100 genList.setFocus(false);
101 selectedGenerator.setFocus();
105 private void loadGenerators() {
106 generators.add(new CalendarEventGenerator(changeListener));
107 generators.add(new ContactInfoGenerator(changeListener));
108 generators.add(new EmailGenerator(changeListener));
109 generators.add(new GeoLocationGenerator(changeListener));
110 generators.add(new PhoneNumberGenerator(changeListener));
111 generators.add(new SmsAddressGenerator(changeListener));
112 generators.add(new TextGenerator(changeListener));
113 generators.add(new UrlGenerator(changeListener));
116 public void setupLeftPanel() {
117 topPanel.setHTML(2, 0,
118 "<span id=\"errorMessageID\" class=\""+StylesDefs.ERROR_MESSAGE+"\"></span>");
120 // fills up the list of generators
121 for(GeneratorSource generator: generators) {
122 genList.addItem(generator.getName());
123 setGridStyle(generator.getWidget());
126 sizeList.addItem("S", "120");
127 sizeList.addItem("M", "230");
128 sizeList.addItem("L", "350");
129 sizeList.setSelectedIndex(2);
131 // updates the second row of the table with the content of the selected
133 genList.addChangeListener(new ChangeListener() {
134 public void onChange(Widget sender) {
135 int i = genList.getSelectedIndex();
140 // grid for the generator picker
141 Grid selectionTable = new Grid(1, 2);
142 selectionTable.setText(0, 0, "Contents");
143 selectionTable.setWidget(0, 1, genList);
144 setGridStyle(selectionTable);
146 topPanel.setWidget(0, 0, selectionTable);
148 // grid for the generate button
149 Grid generateGrid = new Grid(1, 2);
150 setGridStyle(generateGrid);
152 generateButton = new Button("Generate →");
153 generateButton.addClickListener(new ClickListener() {
154 public void onClick(Widget sender) {
158 generateGrid.setWidget(0,1,generateButton);
159 topPanel.setWidget(4, 0, generateGrid);
161 Grid sizeTable = new Grid(1, 2);
162 sizeTable.setText(0, 0, "Barcode size");
163 sizeTable.setWidget(0, 1, sizeList);
164 setGridStyle(sizeTable);
165 topPanel.setWidget(3, 0, sizeTable);
168 protected void setGridStyle(Grid grid) {
169 grid.getColumnFormatter().addStyleName(0, "firstColumn");
170 grid.getColumnFormatter().addStyleName(1, "secondColumn");
171 CellFormatter cellFormatter = grid.getCellFormatter();
172 for(int i = 0; i < grid.getRowCount(); ++i) {
173 cellFormatter.addStyleName(i, 0, "firstColumn");
174 cellFormatter.addStyleName(i, 1, "secondColumn");
178 protected String getUrl(int sizeX, int sizeY, String content) {
179 String result = "http://chart.apis.google.com/chart?cht=qr&chs=";
184 result += URL.encode(content);
188 private void generate() {
190 String text = selectedGenerator.getText();
192 int size = Integer.parseInt(sizeList
193 .getValue(sizeList.getSelectedIndex()));
194 String url = getUrl(size, size, text);
196 result.setVisible(true);
197 urlResult.setText(url);
198 urlResult.setVisible(true);
199 Element linkElement = DOM.getElementById("downloadlink");
200 linkElement.setAttribute("href", url);
201 downloadText.setVisible(true);
202 } catch (GeneratorException ex) {
204 String error = ex.getMessage();
205 showErrorMessage(error);
209 public void invalidateBarcode() {
210 result.setVisible(false);
211 urlResult.setText("");
212 urlResult.setVisible(false);
213 Element linkElement = DOM.getElementById("downloadlink");
214 linkElement.setAttribute("href", "");
215 downloadText.setVisible(false);
218 public void showErrorMessage(String error) {
219 Element errorElement = DOM.getElementById("errorMessageID");
220 errorElement.setInnerHTML(error);
223 public void eraseErrorMessage() {
224 Element errorElement = DOM.getElementById("errorMessageID");
225 errorElement.setInnerHTML(" ");
228 public ChangeListener changeListener = new ChangeListener() {
229 public void onChange(Widget sender) {
231 selectedGenerator.validate(sender);
233 } catch (GeneratorException ex) {
234 String error = ex.getMessage();
235 showErrorMessage(error);