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1 /*******************************************************************************
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2 * Copyright (c) 2005, 2008 IBM Corporation 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 * IBM Corporation - initial API and implementation
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10 * Brad Reynolds - bug 164653
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11 * Ashley Cambrell - bug 198904
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12 *******************************************************************************/
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13 module org.eclipse.jface.internal.databinding.swt.ButtonObservableValue;
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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 org.eclipse.core.databinding.observable.Diffs;
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18 import org.eclipse.core.databinding.observable.Realm;
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19 import org.eclipse.jface.internal.databinding.provisional.swt.AbstractSWTObservableValue;
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20 import org.eclipse.swt.SWT;
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21 import org.eclipse.swt.widgets.Button;
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22 import org.eclipse.swt.widgets.Event;
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23 import org.eclipse.swt.widgets.Listener;
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24
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25 /**
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26 * @since 1.0
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27 *
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28 */
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29 public class ButtonObservableValue : AbstractSWTObservableValue {
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30
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31 private final Button button;
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32
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33 private bool selectionValue;
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34
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35 private Listener updateListener = new class() Listener {
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36 public void handleEvent(Event event) {
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37 bool oldSelectionValue = selectionValue;
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38 selectionValue = button.getSelection();
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39
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40 notifyIfChanged(oldSelectionValue, selectionValue);
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41 }
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42 };
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43
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44 /**
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45 * @param button
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46 */
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47 public this(Button button) {
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48 super(button);
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49 this.button = button;
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50 init();
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51 }
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52
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53 /**
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54 * @param realm
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55 * @param button
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56 */
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57 public this(Realm realm, Button button) {
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58 super(realm, button);
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59 this.button = button;
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60 init();
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61 }
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62
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63 private void init() {
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64 button.addListener(SWT.Selection, updateListener);
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65 button.addListener(SWT.DefaultSelection, updateListener);
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66 }
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67
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68 public void doSetValue(Object value) {
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69 bool oldSelectionValue = selectionValue;
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70 selectionValue = value is null ? false : (cast(Boolean) value)
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71 .booleanValue();
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72
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73 button.setSelection(selectionValue);
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74 notifyIfChanged(oldSelectionValue, selectionValue);
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75 }
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76
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77 public Object doGetValue() {
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78 return button.getSelection() ? Boolean.TRUE : Boolean.FALSE;
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79 }
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80
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81 public Object getValueType() {
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82 return Boolean.TYPE;
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83 }
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84
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85 /*
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86 * (non-Javadoc)
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87 *
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88 * @see org.eclipse.core.databinding.observable.value.AbstractObservableValue#dispose()
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89 */
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90 public synchronized void dispose() {
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91 super.dispose();
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92
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93 if (!button.isDisposed()) {
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94 button.removeListener(SWT.Selection, updateListener);
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95 button.removeListener(SWT.DefaultSelection, updateListener);
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96 }
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97 }
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98
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99 /**
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100 * Notifies consumers with a value change event only if a change occurred.
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101 *
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102 * @param oldValue
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103 * @param newValue
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104 */
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105 private void notifyIfChanged(bool oldValue, bool newValue) {
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106 if (oldValue !is newValue) {
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107 fireValueChange(Diffs.createValueDiff(oldValue ? Boolean.TRUE : Boolean.FALSE,
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108 newValue ? Boolean.TRUE : Boolean.FALSE));
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109 }
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110 }
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111 }
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