Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/client/FLYS.java @ 0:4e8be5e7855f

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Start of a GWT based client for FLYS-3.0 flys-client/trunk@1305 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 08 Feb 2011 10:29:49 +0000
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children 0e22a19852e7
rev   line source
0
4e8be5e7855f Start of a GWT based client for FLYS-3.0
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1 package de.intevation.flys.client.client;
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2
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3 import de.intevation.flys.client.shared.FieldVerifier;
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4 import com.google.gwt.core.client.EntryPoint;
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5 import com.google.gwt.core.client.GWT;
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6 import com.google.gwt.event.dom.client.ClickEvent;
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7 import com.google.gwt.event.dom.client.ClickHandler;
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8 import com.google.gwt.event.dom.client.KeyCodes;
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9 import com.google.gwt.event.dom.client.KeyUpEvent;
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10 import com.google.gwt.event.dom.client.KeyUpHandler;
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11 import com.google.gwt.user.client.rpc.AsyncCallback;
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12 import com.google.gwt.user.client.ui.Button;
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13 import com.google.gwt.user.client.ui.DialogBox;
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14 import com.google.gwt.user.client.ui.HTML;
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15 import com.google.gwt.user.client.ui.Label;
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16 import com.google.gwt.user.client.ui.RootPanel;
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17 import com.google.gwt.user.client.ui.TextBox;
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18 import com.google.gwt.user.client.ui.VerticalPanel;
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19
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20 /**
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21 * Entry point classes define <code>onModuleLoad()</code>.
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22 */
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23 public class FLYS implements EntryPoint {
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24 /**
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25 * The message displayed to the user when the server cannot be reached or
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26 * returns an error.
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27 */
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28 private static final String SERVER_ERROR = "An error occurred while "
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29 + "attempting to contact the server. Please check your network "
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30 + "connection and try again.";
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31
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32 /**
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33 * Create a remote service proxy to talk to the server-side Greeting service.
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34 */
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35 private final GreetingServiceAsync greetingService = GWT.create(GreetingService.class);
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36
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37 /**
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38 * This is the entry point method.
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39 */
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40 public void onModuleLoad() {
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41 final Button sendButton = new Button("Send");
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42 final TextBox nameField = new TextBox();
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43 nameField.setText("GWT User");
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44 final Label errorLabel = new Label();
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45
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46 // We can add style names to widgets
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47 sendButton.addStyleName("sendButton");
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48
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49 // Add the nameField and sendButton to the RootPanel
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50 // Use RootPanel.get() to get the entire body element
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51 RootPanel.get("nameFieldContainer").add(nameField);
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52 RootPanel.get("sendButtonContainer").add(sendButton);
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53 RootPanel.get("errorLabelContainer").add(errorLabel);
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54
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55 // Focus the cursor on the name field when the app loads
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56 nameField.setFocus(true);
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57 nameField.selectAll();
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58
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59 // Create the popup dialog box
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60 final DialogBox dialogBox = new DialogBox();
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61 dialogBox.setText("Remote Procedure Call");
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62 dialogBox.setAnimationEnabled(true);
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63 final Button closeButton = new Button("Close");
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64 // We can set the id of a widget by accessing its Element
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65 closeButton.getElement().setId("closeButton");
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66 final Label textToServerLabel = new Label();
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67 final HTML serverResponseLabel = new HTML();
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68 VerticalPanel dialogVPanel = new VerticalPanel();
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69 dialogVPanel.addStyleName("dialogVPanel");
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70 dialogVPanel.add(new HTML("<b>Sending name to the server:</b>"));
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71 dialogVPanel.add(textToServerLabel);
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72 dialogVPanel.add(new HTML("<br><b>Server replies:</b>"));
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73 dialogVPanel.add(serverResponseLabel);
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74 dialogVPanel.setHorizontalAlignment(VerticalPanel.ALIGN_RIGHT);
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75 dialogVPanel.add(closeButton);
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76 dialogBox.setWidget(dialogVPanel);
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77
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78 // Add a handler to close the DialogBox
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79 closeButton.addClickHandler(new ClickHandler() {
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80 public void onClick(ClickEvent event) {
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81 dialogBox.hide();
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82 sendButton.setEnabled(true);
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83 sendButton.setFocus(true);
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84 }
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85 });
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86
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87 // Create a handler for the sendButton and nameField
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88 class MyHandler implements ClickHandler, KeyUpHandler {
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89 /**
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90 * Fired when the user clicks on the sendButton.
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91 */
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92 public void onClick(ClickEvent event) {
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93 sendNameToServer();
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94 }
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95
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96 /**
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97 * Fired when the user types in the nameField.
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98 */
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99 public void onKeyUp(KeyUpEvent event) {
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100 if (event.getNativeKeyCode() == KeyCodes.KEY_ENTER) {
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101 sendNameToServer();
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102 }
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103 }
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104
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105 /**
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106 * Send the name from the nameField to the server and wait for a response.
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107 */
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108 private void sendNameToServer() {
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109 // First, we validate the input.
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110 errorLabel.setText("");
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111 String textToServer = nameField.getText();
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112 if (!FieldVerifier.isValidName(textToServer)) {
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113 errorLabel.setText("Please enter at least four characters");
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114 return;
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115 }
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116
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117 // Then, we send the input to the server.
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118 sendButton.setEnabled(false);
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119 textToServerLabel.setText(textToServer);
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120 serverResponseLabel.setText("");
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121 greetingService.greetServer(textToServer, new AsyncCallback<String>() {
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122 public void onFailure(Throwable caught) {
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123 // Show the RPC error message to the user
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124 dialogBox.setText("Remote Procedure Call - Failure");
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125 serverResponseLabel.addStyleName("serverResponseLabelError");
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126 serverResponseLabel.setHTML(SERVER_ERROR);
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127 dialogBox.center();
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128 closeButton.setFocus(true);
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129 }
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130
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131 public void onSuccess(String result) {
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132 dialogBox.setText("Remote Procedure Call");
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133 serverResponseLabel.removeStyleName("serverResponseLabelError");
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134 serverResponseLabel.setHTML(result);
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135 dialogBox.center();
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136 closeButton.setFocus(true);
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137 }
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138 });
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139 }
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140 }
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141
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142 // Add a handler to send the name to the server
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143 MyHandler handler = new MyHandler();
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144 sendButton.addClickHandler(handler);
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145 nameField.addKeyUpHandler(handler);
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146 }
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147 }
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