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annotate org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet018CheckboxTableViewerCheckedSelection.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) 2008 Matthew Hall 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 * Matthew Hall - initial API and implementation (bug 124684)
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10 * Matthew Hall - bugs 260329, 260337
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11 ******************************************************************************/
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12
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13 module org.eclipse.jface.examples.databinding.snippets.Snippet018CheckboxTableViewerCheckedSelection;
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14
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15 import java.lang.all;
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16
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17 import java.beans.PropertyChangeListener;
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18 import java.beans.PropertyChangeSupport;
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19 import java.util.ArrayList;
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20 import java.util.Arrays;
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21 import java.util.HashSet;
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22 import java.util.List;
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23 import java.util.Set;
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24
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25 import org.eclipse.core.databinding.DataBindingContext;
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26 import org.eclipse.core.databinding.beans.BeanProperties;
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27 import org.eclipse.core.databinding.beans.BeansObservables;
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28 import org.eclipse.core.databinding.observable.Realm;
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29 import org.eclipse.core.databinding.observable.list.IObservableList;
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30 import org.eclipse.core.databinding.observable.value.ComputedValue;
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31 import org.eclipse.core.databinding.observable.value.IObservableValue;
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32 import org.eclipse.jface.databinding.swt.SWTObservables;
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33 import org.eclipse.jface.databinding.viewers.ViewerSupport;
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34 import org.eclipse.jface.databinding.viewers.ViewersObservables;
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35 import org.eclipse.jface.dialogs.IInputValidator;
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36 import org.eclipse.jface.dialogs.InputDialog;
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37 import org.eclipse.jface.dialogs.MessageDialog;
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38 import org.eclipse.jface.layout.GridDataFactory;
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39 import org.eclipse.jface.layout.GridLayoutFactory;
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40 import org.eclipse.jface.layout.TableColumnLayout;
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41 import org.eclipse.jface.viewers.CheckboxTableViewer;
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42 import org.eclipse.jface.viewers.ColumnWeightData;
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43 import org.eclipse.jface.viewers.IStructuredSelection;
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44 import org.eclipse.jface.viewers.StructuredSelection;
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45 import org.eclipse.jface.viewers.TableViewer;
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46 import org.eclipse.jface.window.Window;
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47 import org.eclipse.swt.SWT;
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48 import org.eclipse.swt.layout.GridLayout;
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49 import org.eclipse.swt.widgets.Button;
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50 import org.eclipse.swt.widgets.Composite;
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51 import org.eclipse.swt.widgets.Display;
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52 import org.eclipse.swt.widgets.Event;
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53 import org.eclipse.swt.widgets.Label;
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54 import org.eclipse.swt.widgets.Listener;
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55 import org.eclipse.swt.widgets.Shell;
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56 import org.eclipse.swt.widgets.Table;
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57 import org.eclipse.swt.widgets.TableColumn;
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58 import org.eclipse.swt.widgets.Text;
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59
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60 /**
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61 * Snippet 018: Binding to the checked elements in a CheckboxTableViewer.
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62 */
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63 public class Snippet018CheckboxTableViewerCheckedSelection {
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64 public static void main(String[] args) {
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65 // The SWT event loop
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66 final Display display = Display.getDefault();
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67 Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
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68 public void run() {
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69 ViewModel viewModel = createSampleModel();
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71 Shell shell = new View(viewModel).createShell();
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72 shell.open();
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73 while (!shell.isDisposed())
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74 if (!display.readAndDispatch())
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75 display.sleep();
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76 }
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77 });
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78 display.dispose();
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79 }
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81 private static ViewModel createSampleModel() {
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82 ViewModel viewModel = new ViewModel();
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83
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84 Person stan = createPerson("Stan");
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85 Person kyle = createPerson("Kyle");
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86 Person eric = createPerson("Eric");
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87 Person kenny = createPerson("Kenny");
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88 Person wendy = createPerson("Wendy");
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89 Person butters = createPerson("Butters");
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91 setFriends(stan, new Person[] { kyle, eric, kenny, wendy });
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92 setFriends(kyle, new Person[] { stan, eric, kenny });
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93 setFriends(eric, new Person[] { eric });
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94 setFriends(kenny, new Person[] { stan, kyle, eric });
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95 setFriends(wendy, new Person[] { stan });
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96 setFriends(butters, new Person[0]);
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98 Person[] people = new Person[] { stan, kyle, eric, kenny, wendy,
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99 butters };
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100 viewModel.setPeople(Arrays.asList(people));
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101 return viewModel;
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102 }
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103
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104 private static Person createPerson(String name) {
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105 Person person = new Person();
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106 person.setName(name);
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107 return person;
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108 }
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109
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110 private static void setFriends(Person person, Person[] friends) {
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111 person.setFriends(new HashSet(Arrays.asList(friends)));
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112 }
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114 // Minimal JavaBeans support
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115 public static abstract class AbstractModelObject {
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116 private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(
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117 this);
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118
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119 public void addPropertyChangeListener(PropertyChangeListener listener) {
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120 propertyChangeSupport.addPropertyChangeListener(listener);
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121 }
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123 public void addPropertyChangeListener(String propertyName,
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124 PropertyChangeListener listener) {
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125 propertyChangeSupport.addPropertyChangeListener(propertyName,
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126 listener);
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127 }
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129 public void removePropertyChangeListener(PropertyChangeListener listener) {
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130 propertyChangeSupport.removePropertyChangeListener(listener);
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131 }
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133 public void removePropertyChangeListener(String propertyName,
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134 PropertyChangeListener listener) {
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135 propertyChangeSupport.removePropertyChangeListener(propertyName,
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136 listener);
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137 }
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139 protected void firePropertyChange(String propertyName, Object oldValue,
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140 Object newValue) {
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141 propertyChangeSupport.firePropertyChange(propertyName, oldValue,
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142 newValue);
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143 }
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144 }
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146 // The data model class.
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147 static class Person extends AbstractModelObject {
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148 private String name;
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149 private Set friends = new HashSet();
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150
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151 public String getName() {
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152 return name;
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153 }
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154
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155 public void setName(String name) {
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156 firePropertyChange("name", this.name, this.name = name);
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157 }
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158
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159 public Set getFriends() {
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160 return new HashSet(friends);
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161 }
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162
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163 public void setFriends(Set friends) {
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164 firePropertyChange("friends", this.friends,
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165 this.friends = new HashSet(friends));
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166 }
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167
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168 public String toString() {
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169 return name;
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170 }
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171 }
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172
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173 // The View's model--the root of our Model graph for this particular GUI.
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174 //
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175 // Typically each View class has a corresponding ViewModel class.
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176 //
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177 // The ViewModel is responsible for getting the objects to edit from the
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178 // data access tier. Since this snippet doesn't have any persistent objects
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179 // to retrieve, this ViewModel just instantiates a model object to edit.
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180 static class ViewModel extends AbstractModelObject {
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181 private List people = new ArrayList();
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182
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183 public List getPeople() {
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184 return new ArrayList(people);
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185 }
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186
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187 public void setPeople(List people) {
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188 firePropertyChange("people", this.people,
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189 this.people = new ArrayList(people));
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190 }
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191 }
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192
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193 // The GUI view
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194 static class View {
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195 private ViewModel viewModel;
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196
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197 private Shell shell;
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198
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199 private Button addPersonButton;
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200 private Button removePersonButton;
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201 private TableViewer peopleViewer;
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202 private Text personName;
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203 private CheckboxTableViewer friendsViewer;
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204
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205 public View(ViewModel viewModel) {
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206 this.viewModel = viewModel;
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207 }
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208
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209 public Shell createShell() {
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210 // Build a UI
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211 final Display display = Display.getCurrent();
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212 shell = new Shell(display);
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213
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214 createUI(shell);
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215
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216 // Bind UI
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217 bindUI();
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218
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219 // Open and return the Shell
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220 shell.setSize(shell.computeSize(400, SWT.DEFAULT));
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221 shell.open();
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222 return shell;
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223 }
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224
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225 private void createUI(Shell shell) {
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226 shell.setText("Binding checked elements in CheckboxTableViewer");
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227 shell.setLayout(new GridLayout(2, false));
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228
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229 new Label(shell, SWT.NONE).setText("People");
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230
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231 Composite buttons = new Composite(shell, SWT.NONE);
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232 GridDataFactory.swtDefaults().align(SWT.RIGHT, SWT.CENTER).applyTo(
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233 buttons);
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234 GridLayoutFactory.fillDefaults().numColumns(2).equalWidth(true)
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235 .applyTo(buttons);
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236 addPersonButton = new Button(buttons, SWT.PUSH);
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237 addPersonButton.setText("Add");
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238 GridDataFactory.fillDefaults().applyTo(addPersonButton);
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239 removePersonButton = new Button(buttons, SWT.PUSH);
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240 removePersonButton.setText("Remove");
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241 GridDataFactory.fillDefaults().applyTo(removePersonButton);
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242
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243 Composite peopleComposite = new Composite(shell, SWT.NONE);
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244 GridDataFactory.fillDefaults().grab(true, true).span(2, 1).applyTo(
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245 peopleComposite);
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246 TableColumnLayout peopleColumnLayout = new TableColumnLayout();
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247 peopleComposite.setLayout(peopleColumnLayout);
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248
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249 peopleViewer = new TableViewer(peopleComposite, SWT.SINGLE
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250 | SWT.BORDER | SWT.FULL_SELECTION);
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251
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252 Table peopleTable = peopleViewer.getTable();
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253 peopleTable.setHeaderVisible(true);
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254 peopleTable.setLinesVisible(true);
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255
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256 TableColumn nameColumn = new TableColumn(peopleTable, SWT.NONE);
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257 nameColumn.setText("Name");
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258 peopleColumnLayout.setColumnData(nameColumn,
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259 new ColumnWeightData(1));
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260
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261 TableColumn friendsColumn = new TableColumn(peopleTable, SWT.NONE);
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262 friendsColumn.setText("Friends");
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263 peopleColumnLayout.setColumnData(friendsColumn,
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264 new ColumnWeightData(3));
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265
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266 new Label(shell, SWT.NONE).setText("Name");
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267
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268 personName = new Text(shell, SWT.BORDER);
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269 GridDataFactory.fillDefaults().grab(true, false)
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270 .applyTo(personName);
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271
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272 new Label(shell, SWT.NONE).setText("Friends");
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273
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274 Composite friendsComposite = new Composite(shell, SWT.NONE);
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275 GridDataFactory.fillDefaults().grab(true, true).applyTo(
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276 friendsComposite);
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277 TableColumnLayout friendsColumnLayout = new TableColumnLayout();
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278 friendsComposite.setLayout(friendsColumnLayout);
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279
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280 friendsViewer = CheckboxTableViewer.newCheckList(friendsComposite,
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281 SWT.SINGLE | SWT.BORDER | SWT.FULL_SELECTION);
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282
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283 Table friendsTable = friendsViewer.getTable();
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284 friendsTable.setHeaderVisible(true);
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285 friendsTable.setLinesVisible(true);
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286 TableColumn friendNameColumn = new TableColumn(friendsTable,
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287 SWT.NONE);
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288 friendNameColumn.setText("Name");
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289 friendsColumnLayout.setColumnData(friendNameColumn,
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290 new ColumnWeightData(1));
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291
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292 GridDataFactory.fillDefaults().grab(true, true).applyTo(
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293 friendsViewer.getTable());
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294 }
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295
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296 private void bindUI() {
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297 DataBindingContext dbc = new DataBindingContext();
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298
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299 final IObservableList people = BeansObservables.observeList(Realm
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300 .getDefault(), viewModel, "people");
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301
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302 addPersonButton.addListener(SWT.Selection, new Listener() {
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303 public void handleEvent(Event event) {
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304 InputDialog dlg = new InputDialog(shell, "Add Person",
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305 "Enter name:", "<Name>", new IInputValidator() {
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306 public String isValid(String newText) {
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307 if (newText == null
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308 || newText.length() == 0)
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309 return "Name cannot be empty";
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310 return null;
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311 }
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312 });
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313 if (dlg.open() == Window.OK) {
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314 Person person = new Person();
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315 person.setName(dlg.getValue());
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316 people.add(person);
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317 peopleViewer.setSelection(new StructuredSelection(
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318 person));
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319 }
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320 }
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321 });
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322
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323 removePersonButton.addListener(SWT.Selection, new Listener() {
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324 public void handleEvent(Event event) {
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325 IStructuredSelection selected = (IStructuredSelection) peopleViewer
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326 .getSelection();
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327 if (selected.isEmpty())
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328 return;
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329 Person person = (Person) selected.getFirstElement();
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330 if (MessageDialog.openConfirm(shell, "Remove person",
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331 "Remove " + person.getName() + "?"))
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332 people.remove(person);
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333 }
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334 });
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335
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336 ViewerSupport.bind(peopleViewer, people, BeanProperties.values(
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337 Person.class, new String[] { "name", "friends" }));
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338
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339 final IObservableValue selectedPerson = ViewersObservables
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340 .observeSingleSelection(peopleViewer);
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341
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342 IObservableValue personSelected = new ComputedValue(bool.TYPE) {
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343 protected Object calculate() {
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344 return bool.valueOf(selectedPerson.getValue() != null);
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345 }
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346 };
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347 dbc.bindValue(SWTObservables.observeEnabled(removePersonButton),
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348 personSelected);
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349 dbc.bindValue(SWTObservables.observeEnabled(friendsViewer
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350 .getTable()), personSelected);
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351
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352 dbc.bindValue(SWTObservables.observeText(personName, SWT.Modify),
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353 BeansObservables.observeDetailValue(selectedPerson, "name",
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354 String.class));
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355
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356 ViewerSupport.bind(friendsViewer, people, BeanProperties.value(
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357 Person.class, "name"));
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358
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359 dbc.bindSet(ViewersObservables.observeCheckedElements(
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360 friendsViewer, Person.class), BeansObservables
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361 .observeDetailSet(selectedPerson, "friends", Person.class));
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362 }
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363 }
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364 }
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365 void main( String[] args ){
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366 Snippet018CheckboxTableViewerCheckedSelection.main(args);
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367 }