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annotate org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet003UpdateComboBindUsingViewer.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 The Pampered Chef, Inc. 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 * The Pampered Chef, Inc. - initial API and implementation
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10 * Brad Reynolds - bug 116920
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11 * Matthew Hall - bugs 260329, 260337
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12 ******************************************************************************/
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13
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14 package org.eclipse.jface.examples.databinding.snippets;
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15
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16 import java.beans.PropertyChangeListener;
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17 import java.beans.PropertyChangeSupport;
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18 import java.util.ArrayList;
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19 import java.util.List;
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20
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21 import org.eclipse.core.databinding.DataBindingContext;
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22 import org.eclipse.core.databinding.beans.BeansObservables;
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23 import org.eclipse.core.databinding.observable.Realm;
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24 import org.eclipse.core.databinding.property.Properties;
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25 import org.eclipse.jface.databinding.swt.SWTObservables;
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26 import org.eclipse.jface.databinding.viewers.ViewerSupport;
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27 import org.eclipse.jface.databinding.viewers.ViewersObservables;
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28 import org.eclipse.jface.viewers.ComboViewer;
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29 import org.eclipse.swt.SWT;
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30 import org.eclipse.swt.events.SelectionAdapter;
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31 import org.eclipse.swt.events.SelectionEvent;
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32 import org.eclipse.swt.layout.RowLayout;
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33 import org.eclipse.swt.widgets.Button;
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34 import org.eclipse.swt.widgets.Combo;
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35 import org.eclipse.swt.widgets.Display;
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36 import org.eclipse.swt.widgets.Shell;
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37
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38 /**
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39 * Shows how to bind a Combo so that when update its items, the selection is
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40 * retained if at all possible.
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41 *
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42 * @since 3.2
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43 */
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44 public class Snippet003UpdateComboBindUsingViewer {
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45 public static void main(String[] args) {
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46 final Display display = new Display();
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47 Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
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48 public void run() {
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49 ViewModel viewModel = new ViewModel();
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50 Shell shell = new View(viewModel).createShell();
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51
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52 // The SWT event loop
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53 while (!shell.isDisposed()) {
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54 if (!display.readAndDispatch()) {
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55 display.sleep();
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56 }
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57 }
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58 // Print the results
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59 System.out.println(viewModel.getText());
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60 }
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61 });
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62 display.dispose();
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63 }
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64
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65 // Minimal JavaBeans support
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66 public static abstract class AbstractModelObject {
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67 private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(
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68 this);
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69
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70 public void addPropertyChangeListener(PropertyChangeListener listener) {
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71 propertyChangeSupport.addPropertyChangeListener(listener);
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72 }
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73
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74 public void addPropertyChangeListener(String propertyName,
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75 PropertyChangeListener listener) {
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76 propertyChangeSupport.addPropertyChangeListener(propertyName,
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77 listener);
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78 }
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79
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80 public void removePropertyChangeListener(PropertyChangeListener listener) {
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81 propertyChangeSupport.removePropertyChangeListener(listener);
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82 }
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83
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84 public void removePropertyChangeListener(String propertyName,
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85 PropertyChangeListener listener) {
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86 propertyChangeSupport.removePropertyChangeListener(propertyName,
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87 listener);
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88 }
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89
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90 protected void firePropertyChange(String propertyName, Object oldValue,
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91 Object newValue) {
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92 propertyChangeSupport.firePropertyChange(propertyName, oldValue,
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93 newValue);
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94 }
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95 }
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96
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97 // The View's model--the root of our Model graph for this particular GUI.
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98 public static class ViewModel extends AbstractModelObject {
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99 private String text = "beef";
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100
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101 private List choices = new ArrayList();
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102 {
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103 choices.add("pork");
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104 choices.add("beef");
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105 choices.add("poultry");
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106 choices.add("vegatables");
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107 }
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108
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109 public List getChoices() {
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110 return choices;
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111 }
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112
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113 public void setChoices(List choices) {
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114 this.choices = choices;
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115 firePropertyChange("choices", null, null);
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116 }
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117
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118 public String getText() {
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119 return text;
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120 }
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121
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122 public void setText(String text) {
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123 String oldValue = this.text;
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124 this.text = text;
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125 firePropertyChange("text", oldValue, text);
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126 }
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127 }
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128
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129 // The GUI view
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130 static class View {
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131 private ViewModel viewModel;
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132
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133 public View(ViewModel viewModel) {
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134 this.viewModel = viewModel;
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135 }
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136
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137 public Shell createShell() {
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138 // Build a UI
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139 Shell shell = new Shell(Display.getCurrent());
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140 shell.setLayout(new RowLayout(SWT.VERTICAL));
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141
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142 Combo combo = new Combo(shell, SWT.BORDER | SWT.READ_ONLY);
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143 ComboViewer viewer = new ComboViewer(combo);
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144 Button reset = new Button(shell, SWT.NULL);
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145 reset.setText("reset collection");
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146 reset.addSelectionListener(new SelectionAdapter() {
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147 public void widgetSelected(SelectionEvent e) {
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148 List newList = new ArrayList();
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149 newList.add("Chocolate");
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150 newList.add("Vanilla");
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151 newList.add("Mango Parfait");
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152 newList.add("beef");
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153 newList.add("Cheesecake");
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154 viewModel.setChoices(newList);
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155 }
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156 });
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157
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158 // Print value out first
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159 System.out.println(viewModel.getText());
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160
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161 DataBindingContext dbc = new DataBindingContext();
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162 ViewerSupport.bind(viewer, BeansObservables.observeList(viewModel,
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163 "choices", String.class), Properties
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164 .selfValue(String.class));
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165
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166 dbc.bindValue(ViewersObservables.observeSingleSelection(viewer),
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167 BeansObservables.observeValue(viewModel, "text"));
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168
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169 // Open and return the Shell
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170 shell.pack();
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171 shell.open();
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172 return shell;
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173 }
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174 }
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175 }