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annotate org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet011ValidateMultipleBindingsSnippet.d @ 100:e884642ad36e

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more work on examples
author Frank Benoit <benoit@tionex.de>
date Thu, 23 Apr 2009 00:02:38 +0200
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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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15 import tango.io.Stdout;
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16
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17 import org.eclipse.core.databinding.DataBindingContext;
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18 import org.eclipse.core.databinding.UpdateValueStrategy;
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19 import org.eclipse.core.databinding.observable.Realm;
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20 import org.eclipse.core.databinding.observable.value.IObservableValue;
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21 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
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22 import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
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23 import org.eclipse.core.databinding.observable.value.WritableValue;
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24 import org.eclipse.core.databinding.validation.IValidator;
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25 import org.eclipse.core.databinding.validation.ValidationStatus;
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26 import org.eclipse.core.runtime.IStatus;
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27 import org.eclipse.jface.databinding.swt.SWTObservables;
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28 import org.eclipse.swt.SWT;
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29 import org.eclipse.swt.layout.GridLayout;
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30 import org.eclipse.swt.widgets.Composite;
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31 import org.eclipse.swt.widgets.Display;
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32 import org.eclipse.swt.widgets.Shell;
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33 import org.eclipse.swt.widgets.Text;
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34
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35 /**
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36 * Snippet that validates values across multiple bindings on change of each
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37 * observable. If the values of the target observables are not equal the model
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38 * is not updated. When the values are equal they will be written to sysout.
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39 *
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40 * @author Brad Reynolds
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41 */
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42 public class Snippet011ValidateMultipleBindingsSnippet {
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43 public static void main(String[] args) {
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44 Realm.runWithDefault(SWTObservables.getRealm(Display.getDefault()),
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45 new class() Runnable {
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46 public void run() {
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47 Snippet011ValidateMultipleBindingsSnippet.run();
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48 }
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49 });
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50 }
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51
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52 private static void run() {
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53 Shell shell = new Shell();
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55 View view = new View(shell);
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56 final Model model = new Model();
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58 DataBindingContext dbc = new DataBindingContext();
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59 dbc.bindValue(SWTObservables.observeText(view.text1, SWT.Modify),
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60 model.value1, (new UpdateValueStrategy())
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61 .setAfterConvertValidator(new CrossFieldValidator(
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62 model.value2)), null);
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63 dbc.bindValue(SWTObservables.observeText(view.text2, SWT.Modify),
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64 model.value2, (new UpdateValueStrategy())
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65 .setAfterConvertValidator(new CrossFieldValidator(
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66 model.value1)), null);
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68 // DEBUG - print to show value change
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69 model.value1.addValueChangeListener(new class() IValueChangeListener {
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70 public void handleValueChange(ValueChangeEvent event) {
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71 Stdout.formatln("Value 1: {}", model.value1.getValue());
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72 }
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73 });
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75 // DEBUG - print to show value change
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76 model.value2.addValueChangeListener(new class() IValueChangeListener {
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77 public void handleValueChange(ValueChangeEvent event) {
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78 Stdout.formatln("Value 2: {}", model.value2.getValue());
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79 }
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80 });
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82 shell.pack();
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83 shell.open();
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84 Display display = shell.getDisplay();
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85 while (!shell.isDisposed()) {
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86 if (!display.readAndDispatch())
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87 display.sleep();
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88 }
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89 display.dispose();
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90 }
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92 /**
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93 * @since 3.2
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94 *
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95 */
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96 private static final class CrossFieldValidator : IValidator {
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97 /**
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98 *
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99 */
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100 private final IObservableValue other;
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101
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102 /**
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103 * @param model
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104 */
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105 private this(IObservableValue other) {
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106 this.other = other;
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107 }
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108
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109 public IStatus validate(Object value) {
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110 if (!value.opEquals(other.getValue())) {
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111 return ValidationStatus.ok();
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112 }
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113 return ValidationStatus.error("values cannot be the same");
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114 }
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115 }
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117 static class Model {
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118 WritableValue value1;
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119 WritableValue value2;
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120 this(){
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121 value1 = new WritableValue();
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122 value2 = new WritableValue();
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123 }
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124 }
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125
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126 static class View {
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127 Text text1;
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128 Text text2;
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129
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130 this(Composite composite) {
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131 composite.setLayout(new GridLayout(2, true));
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132 text1 = new Text(composite, SWT.BORDER);
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133 text2 = new Text(composite, SWT.BORDER);
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134 }
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135 }
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136 }
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137 void main( String[] args ){
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138 Snippet011ValidateMultipleBindingsSnippet.main(args);
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139 }