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annotate org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet011ValidateMultipleBindingsSnippet.d @ 99:5d5bd660917f

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build some databind snippets
author Frank Benoit <benoit@tionex.de>
date Wed, 22 Apr 2009 18:59:26 +0200
parents 6086085e153d
children e884642ad36e
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1 /*******************************************************************************
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2 * Copyright (c) 2007 Brad Reynolds and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * Brad Reynolds - initial API and implementation
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10 ******************************************************************************/
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11
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12 module org.eclipse.jface.examples.databinding.snippets.Snippet011ValidateMultipleBindingsSnippet;
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13
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14 import java.lang.all;
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16 import org.eclipse.core.databinding.DataBindingContext;
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17 import org.eclipse.core.databinding.UpdateValueStrategy;
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18 import org.eclipse.core.databinding.observable.Realm;
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19 import org.eclipse.core.databinding.observable.value.IObservableValue;
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20 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
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21 import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
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22 import org.eclipse.core.databinding.observable.value.WritableValue;
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23 import org.eclipse.core.databinding.validation.IValidator;
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24 import org.eclipse.core.databinding.validation.ValidationStatus;
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25 import org.eclipse.core.runtime.IStatus;
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26 import org.eclipse.jface.databinding.swt.SWTObservables;
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27 import org.eclipse.swt.SWT;
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28 import org.eclipse.swt.layout.GridLayout;
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29 import org.eclipse.swt.widgets.Composite;
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30 import org.eclipse.swt.widgets.Display;
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31 import org.eclipse.swt.widgets.Shell;
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32 import org.eclipse.swt.widgets.Text;
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33
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34 /**
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35 * Snippet that validates values across multiple bindings on change of each
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36 * observable. If the values of the target observables are not equal the model
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37 * is not updated. When the values are equal they will be written to sysout.
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38 *
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39 * @author Brad Reynolds
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40 */
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41 public class Snippet011ValidateMultipleBindingsSnippet {
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42 public static void main(String[] args) {
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43 Realm.runWithDefault(SWTObservables.getRealm(Display.getDefault()),
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44 new Runnable() {
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45 public void run() {
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46 Snippet011ValidateMultipleBindingsSnippet.run();
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47 }
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48 });
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49 }
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51 private static void run() {
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52 Shell shell = new Shell();
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54 View view = new View(shell);
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55 final Model model = new Model();
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57 DataBindingContext dbc = new DataBindingContext();
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58 dbc.bindValue(SWTObservables.observeText(view.text1, SWT.Modify),
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59 model.value1, new UpdateValueStrategy()
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60 .setAfterConvertValidator(new CrossFieldValidator(
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61 model.value2)), null);
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62 dbc.bindValue(SWTObservables.observeText(view.text2, SWT.Modify),
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63 model.value2, new UpdateValueStrategy()
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64 .setAfterConvertValidator(new CrossFieldValidator(
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65 model.value1)), null);
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67 // DEBUG - print to show value change
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68 model.value1.addValueChangeListener(new IValueChangeListener() {
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69 public void handleValueChange(ValueChangeEvent event) {
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70 System.out.println("Value 1: " + model.value1.getValue());
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71 }
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72 });
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74 // DEBUG - print to show value change
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75 model.value2.addValueChangeListener(new IValueChangeListener() {
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76 public void handleValueChange(ValueChangeEvent event) {
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77 System.out.println("Value 2: " + model.value2.getValue());
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78 }
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79 });
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81 shell.pack();
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82 shell.open();
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83 Display display = shell.getDisplay();
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84 while (!shell.isDisposed()) {
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85 if (!display.readAndDispatch())
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86 display.sleep();
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87 }
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88 display.dispose();
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89 }
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91 /**
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92 * @since 3.2
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93 *
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94 */
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95 private static final class CrossFieldValidator implements IValidator {
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96 /**
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97 *
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98 */
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99 private final IObservableValue other;
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100
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101 /**
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102 * @param model
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103 */
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104 private CrossFieldValidator(IObservableValue other) {
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105 this.other = other;
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106 }
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108 public IStatus validate(Object value) {
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109 if (!value.equals(other.getValue())) {
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110 return ValidationStatus.ok();
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111 }
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112 return ValidationStatus.error("values cannot be the same");
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113 }
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114 }
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116 static class Model {
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117 WritableValue value1 = new WritableValue();
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118 WritableValue value2 = new WritableValue();
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119 }
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121 static class View {
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122 Text text1;
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123 Text text2;
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125 View(Composite composite) {
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126 composite.setLayout(new GridLayout(2, true));
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127 text1 = new Text(composite, SWT.BORDER);
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128 text2 = new Text(composite, SWT.BORDER);
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129 }
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130 }
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131 }
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132 void main( String[] args ){
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133 Snippet011ValidateMultipleBindingsSnippet.main(args);
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134 }