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annotate org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet002UpdateComboRetainSelection.d @ 125:c43718956f21 default tip

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Updated the snippets status.
author Jacob Carlborg <doob@me.com>
date Thu, 11 Aug 2011 19:55:14 +0200
parents 5d5bd660917f
children
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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 - bug 260329
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12 ******************************************************************************/
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13
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14 module org.eclipse.jface.examples.databinding.snippets.Snippet002UpdateComboRetainSelection;
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15
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16 import java.lang.all;
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17
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18 import java.beans.PropertyChangeListener;
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19 import java.beans.PropertyChangeSupport;
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20 import java.util.ArrayList;
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21 import java.util.Collection;
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22 import java.util.List;
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23
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24 import org.eclipse.core.databinding.DataBindingContext;
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25 import org.eclipse.core.databinding.beans.BeansObservables;
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26 import org.eclipse.core.databinding.observable.IObservable;
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27 import org.eclipse.core.databinding.observable.Realm;
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28 import org.eclipse.core.databinding.observable.list.IObservableList;
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29 import org.eclipse.core.databinding.observable.list.WritableList;
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30 import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
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31 import org.eclipse.core.databinding.observable.masterdetail.MasterDetailObservables;
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32 import org.eclipse.jface.databinding.swt.SWTObservables;
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33 import org.eclipse.swt.SWT;
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34 import org.eclipse.swt.events.SelectionAdapter;
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35 import org.eclipse.swt.events.SelectionEvent;
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36 import org.eclipse.swt.layout.RowLayout;
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37 import org.eclipse.swt.widgets.Button;
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38 import org.eclipse.swt.widgets.Combo;
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39 import org.eclipse.swt.widgets.Display;
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40 import org.eclipse.swt.widgets.Shell;
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41
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42 import tango.io.Stdout;
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43
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44 /**
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45 * Shows how to bind a Combo so that when update its items, the selection is
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46 * retained if at all possible.
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47 *
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48 * @since 3.2
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49 */
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50 public class Snippet002UpdateComboRetainSelection {
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51 public static void main(String[] args) {
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52 final Display display = new Display();
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53 Realm.runWithDefault(SWTObservables.getRealm(display), dgRunnable((Display display_) {
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54 ViewModel viewModel = new ViewModel();
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55 Shell shell = (new View(viewModel)).createShell();
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56
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57 // The SWT event loop
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58 while (!shell.isDisposed()) {
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59 if (!display_.readAndDispatch()) {
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60 display_.sleep();
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61 }
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62 }
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63
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64 // Print the results
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65 Stdout.formatln( "{}", viewModel.getText());
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66 }, display));
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67 display.dispose();
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68 }
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69
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70 // Minimal JavaBeans support
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71 public static abstract class AbstractModelObject {
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72 private PropertyChangeSupport propertyChangeSupport;
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73 this(){
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74 propertyChangeSupport = new PropertyChangeSupport(this);
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75 }
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76
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77 public void addPropertyChangeListener(PropertyChangeListener listener) {
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78 propertyChangeSupport.addPropertyChangeListener(listener);
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79 }
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80
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81 public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) {
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82 propertyChangeSupport.addPropertyChangeListener(propertyName, listener);
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83 }
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84
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85 public void removePropertyChangeListener(PropertyChangeListener listener) {
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86 propertyChangeSupport.removePropertyChangeListener(listener);
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87 }
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88
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89 public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) {
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90 propertyChangeSupport.removePropertyChangeListener(propertyName, listener);
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91 }
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92
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93 protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
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94 propertyChangeSupport.firePropertyChange(propertyName, oldValue, newValue);
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95 }
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96 }
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97
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98 // The View's model--the root of our Model graph for this particular GUI.
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99 public static class ViewModel : AbstractModelObject {
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100 private String text = "beef";
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101
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102 private List choices;
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103 this(){
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104 choices = new ArrayList();
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105 choices.add("pork");
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106 choices.add("beef");
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107 choices.add("poultry");
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108 choices.add("vegatables");
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109 }
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110
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111 public List getChoices() {
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112 return choices;
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113 }
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114
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115 public void setChoices(List choices) {
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116 List old = this.choices;
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117 this.choices = choices;
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118 firePropertyChange("choices", cast(Object)old, cast(Object)choices);
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119 }
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120
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121 public String getText() {
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122 return text;
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123 }
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124
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125 public void setText(String text) {
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126 String oldValue = this.text;
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127 this.text = text;
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128 firePropertyChange("text", stringcast(oldValue), stringcast(text));
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129 }
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130 }
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131
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132 // The GUI view
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133 static class View {
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134 private ViewModel viewModel;
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135 /**
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136 * used to make a new choices array unique
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137 */
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138 static int count;
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139
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140 public this(ViewModel viewModel) {
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141 this.viewModel = viewModel;
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142 }
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143 class ResetSelectionListener : SelectionAdapter {
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144 public void widgetSelected(SelectionEvent e) {
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145 List newList = new ArrayList();
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146 newList.add("Chocolate");
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147 newList.add("Vanilla");
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148 newList.add("Mango Parfait");
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149 newList.add("beef");
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150 newList.add("Cheesecake");
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151 newList.add(Integer.toString(++count));
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152 viewModel.setChoices(newList);
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153 }
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154 }
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155
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156 public Shell createShell() {
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157 // Build a UI
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158 Shell shell = new Shell(Display.getCurrent());
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159 shell.setLayout(new RowLayout(SWT.VERTICAL));
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160
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161 Combo combo = new Combo(shell, SWT.BORDER | SWT.READ_ONLY);
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162 Button reset = new Button(shell, SWT.NULL);
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163 reset.setText("reset collection");
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164 reset.addSelectionListener(new ResetSelectionListener());
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165
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166 // Print value out first
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167 Stdout.formatln("{}", viewModel.getText());
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168
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169 DataBindingContext dbc = new DataBindingContext();
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170
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171 IObservableList list = MasterDetailObservables.detailList(BeansObservables.observeValue(viewModel, "choices"),
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172 getListDetailFactory(),
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173 Class.fromType!(String));
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174 dbc.bindList(SWTObservables.observeItems(combo), list, null, null );
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175 dbc.bindValue(SWTObservables.observeText(combo), BeansObservables.observeValue(viewModel, "text"), null, null );
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176
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177 // Open and return the Shell
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178 shell.pack();
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179 shell.open();
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180 return shell;
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181 }
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182 }
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183
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184 private static IObservableFactory getListDetailFactory() {
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185 return new class() IObservableFactory {
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186 public IObservable createObservable(Object target) {
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187 WritableList list = WritableList.withElementType(Class.fromType!(String));
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188 list.addAll(cast(Collection) target);
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189 return list;
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190 }
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191 };
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192 }
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193 }
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194
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195 void main( String[] args ){
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196 Snippet002UpdateComboRetainSelection.main(args);
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197 }
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198