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annotate org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet008ComputedValue.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) 2006 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 * Matthew Hall - bug 260329
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11 ******************************************************************************/
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12
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13 package org.eclipse.jface.examples.databinding.snippets;
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14
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15 import org.eclipse.core.databinding.DataBindingContext;
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16 import org.eclipse.core.databinding.UpdateValueStrategy;
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17 import org.eclipse.core.databinding.observable.ObservableTracker;
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18 import org.eclipse.core.databinding.observable.Realm;
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19 import org.eclipse.core.databinding.observable.value.ComputedValue;
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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.WritableValue;
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22 import org.eclipse.jface.databinding.swt.SWTObservables;
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23 import org.eclipse.jface.layout.GridDataFactory;
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24 import org.eclipse.jface.layout.GridLayoutFactory;
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25 import org.eclipse.swt.SWT;
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26 import org.eclipse.swt.layout.FillLayout;
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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.Label;
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30 import org.eclipse.swt.widgets.Shell;
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31 import org.eclipse.swt.widgets.Text;
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32
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33 /**
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34 * Snippet that demostrates a simple use case using ComputedValue to format a
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35 * name as the user enters first and last name.
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36 *
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37 * @since 3.2
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38 */
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39 public class Snippet008ComputedValue {
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40 /**
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41 * @param args
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42 */
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43 public static void main(String[] args) {
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44 final Display display = new Display();
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45 Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
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46 public void run() {
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47 Shell shell = new Shell(display);
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48 shell.setLayout(new FillLayout());
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49
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50 final UI ui = new UI(shell);
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51 final Data data = new Data();
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52
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53 // Bind the UI to the Data.
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54 DataBindingContext dbc = new DataBindingContext();
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55 dbc.bindValue(SWTObservables.observeText(ui.firstName,
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56 SWT.Modify), data.firstName);
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57 dbc.bindValue(SWTObservables.observeText(ui.lastName,
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58 SWT.Modify), data.lastName);
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59
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60 // Construct the formatted name observable.
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61 FormattedName formattedName = new FormattedName(data.firstName,
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62 data.lastName);
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63
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64 // Bind the formatted name Text to the formatted name
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65 // observable.
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66 dbc.bindValue(SWTObservables.observeText(ui.formattedName,
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67 SWT.None), formattedName, new UpdateValueStrategy(false, UpdateValueStrategy.POLICY_NEVER), null);
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68
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69 shell.pack();
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70 shell.open();
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71 while (!shell.isDisposed()) {
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72 if (!display.readAndDispatch())
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73 display.sleep();
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74 }
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75 }
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76 });
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77 display.dispose();
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78 }
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79
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80 /**
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81 * Creates the formatted name on change of the first or last name
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82 * observables.
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83 * <p>
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84 * The key to understanding ComputedValue is understanding that it knows of
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85 * the observables that are queried without being told. This is done with
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86 * {@link ObservableTracker} voodoo. When calculate() is invoked
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87 * <code>ObservableTracker</code> records the observables that are
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88 * queried. It then exposes those observables and <code>ComputedValue</code>
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89 * can listen to changes in those objects and react accordingly.
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90 * </p>
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91 *
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92 * @since 3.2
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93 */
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94 static class FormattedName extends ComputedValue {
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95 private IObservableValue firstName;
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96
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97 private IObservableValue lastName;
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98
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99 FormattedName(IObservableValue firstName, IObservableValue lastName) {
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100 this.firstName = firstName;
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101 this.lastName = lastName;
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102 }
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103
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104 protected Object calculate() {
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105 String lastName = (String) this.lastName.getValue();
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106 String firstName = (String) this.firstName.getValue();
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107 lastName = (lastName != null && lastName.length() > 0) ? lastName
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108 : "[Last Name]";
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109 firstName = (firstName != null && firstName.length() > 0) ? firstName
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110 : "[First Name]";
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111
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112 StringBuffer buffer = new StringBuffer();
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113 buffer.append(lastName).append(", ").append(firstName);
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114
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115 return buffer.toString();
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116 }
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117 }
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118
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119 static class Data {
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120 final WritableValue firstName;
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121
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122 final WritableValue lastName;
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123
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124 Data() {
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125 firstName = new WritableValue("", String.class);
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126 lastName = new WritableValue("", String.class);
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127 }
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128 }
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129
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130 /**
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131 * Composite that creates the UI.
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132 *
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133 * @since 3.2
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134 */
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135 static class UI extends Composite {
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136 final Text firstName;
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137
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138 final Text lastName;
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139
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140 final Text formattedName;
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141
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142 UI(Composite parent) {
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143 super(parent, SWT.NONE);
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144
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145 GridLayoutFactory.swtDefaults().numColumns(2).applyTo(this);
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146
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147 new Label(this, SWT.NONE).setText("First Name:");
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148 new Label(this, SWT.NONE).setText("Last Name");
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149
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150 GridDataFactory gdf = GridDataFactory.swtDefaults().align(SWT.FILL,
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151 SWT.FILL).grab(true, false);
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152 firstName = new Text(this, SWT.BORDER);
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153 gdf.applyTo(firstName);
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154
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155 lastName = new Text(this, SWT.BORDER);
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156 gdf.applyTo(lastName);
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157
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158 gdf = GridDataFactory.swtDefaults().span(2, 1).grab(true, false)
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159 .align(SWT.FILL, SWT.BEGINNING);
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160 Label label = new Label(this, SWT.NONE);
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161 label.setText("Formatted Name:");
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162 gdf.applyTo(label);
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163
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164 formattedName = new Text(this, SWT.BORDER);
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165 formattedName.setEditable(false);
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166 gdf.applyTo(formattedName);
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167 }
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168 }
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169 }