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annotate org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet011ValidateMultipleBindingsSnippet.d @ 90:6086085e153d

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Added databinding snippets. unmodified java sources.
author Frank Benoit <benoit@tionex.de>
date Sun, 19 Apr 2009 11:33:55 +0200
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children 5d5bd660917f
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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 package org.eclipse.jface.examples.databinding.snippets;
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13
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14 import org.eclipse.core.databinding.DataBindingContext;
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15 import org.eclipse.core.databinding.UpdateValueStrategy;
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16 import org.eclipse.core.databinding.observable.Realm;
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17 import org.eclipse.core.databinding.observable.value.IObservableValue;
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18 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
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19 import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
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20 import org.eclipse.core.databinding.observable.value.WritableValue;
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21 import org.eclipse.core.databinding.validation.IValidator;
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22 import org.eclipse.core.databinding.validation.ValidationStatus;
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23 import org.eclipse.core.runtime.IStatus;
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24 import org.eclipse.jface.databinding.swt.SWTObservables;
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25 import org.eclipse.swt.SWT;
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26 import org.eclipse.swt.layout.GridLayout;
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27 import org.eclipse.swt.widgets.Composite;
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28 import org.eclipse.swt.widgets.Display;
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29 import org.eclipse.swt.widgets.Shell;
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30 import org.eclipse.swt.widgets.Text;
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31
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32 /**
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33 * Snippet that validates values across multiple bindings on change of each
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34 * observable. If the values of the target observables are not equal the model
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35 * is not updated. When the values are equal they will be written to sysout.
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36 *
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37 * @author Brad Reynolds
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38 */
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39 public class Snippet011ValidateMultipleBindingsSnippet {
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40 public static void main(String[] args) {
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41 Realm.runWithDefault(SWTObservables.getRealm(Display.getDefault()),
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42 new Runnable() {
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43 public void run() {
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44 Snippet011ValidateMultipleBindingsSnippet.run();
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45 }
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46 });
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47 }
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48
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49 private static void run() {
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50 Shell shell = new Shell();
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51
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52 View view = new View(shell);
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53 final Model model = new Model();
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54
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55 DataBindingContext dbc = new DataBindingContext();
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56 dbc.bindValue(SWTObservables.observeText(view.text1, SWT.Modify),
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57 model.value1, new UpdateValueStrategy()
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58 .setAfterConvertValidator(new CrossFieldValidator(
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59 model.value2)), null);
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60 dbc.bindValue(SWTObservables.observeText(view.text2, SWT.Modify),
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61 model.value2, new UpdateValueStrategy()
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62 .setAfterConvertValidator(new CrossFieldValidator(
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63 model.value1)), null);
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64
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65 // DEBUG - print to show value change
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66 model.value1.addValueChangeListener(new IValueChangeListener() {
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67 public void handleValueChange(ValueChangeEvent event) {
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68 System.out.println("Value 1: " + model.value1.getValue());
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69 }
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70 });
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71
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72 // DEBUG - print to show value change
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73 model.value2.addValueChangeListener(new IValueChangeListener() {
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74 public void handleValueChange(ValueChangeEvent event) {
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75 System.out.println("Value 2: " + model.value2.getValue());
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76 }
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77 });
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78
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79 shell.pack();
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80 shell.open();
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81 Display display = shell.getDisplay();
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82 while (!shell.isDisposed()) {
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83 if (!display.readAndDispatch())
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84 display.sleep();
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85 }
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86 display.dispose();
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87 }
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88
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89 /**
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90 * @since 3.2
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91 *
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92 */
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93 private static final class CrossFieldValidator implements IValidator {
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94 /**
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95 *
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96 */
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97 private final IObservableValue other;
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98
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99 /**
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100 * @param model
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101 */
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102 private CrossFieldValidator(IObservableValue other) {
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103 this.other = other;
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104 }
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105
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106 public IStatus validate(Object value) {
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107 if (!value.equals(other.getValue())) {
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108 return ValidationStatus.ok();
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109 }
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110 return ValidationStatus.error("values cannot be the same");
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111 }
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112 }
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113
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114 static class Model {
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115 WritableValue value1 = new WritableValue();
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116 WritableValue value2 = new WritableValue();
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117 }
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118
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119 static class View {
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120 Text text1;
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121 Text text2;
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122
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123 View(Composite composite) {
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124 composite.setLayout(new GridLayout(2, true));
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125 text1 = new Text(composite, SWT.BORDER);
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126 text2 = new Text(composite, SWT.BORDER);
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127 }
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128 }
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129 }