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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 * Matthew Hall - bug 118516
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13 *******************************************************************************/
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14 module org.eclipse.jface.internal.databinding.swt.SpinnerObservableValue;
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85
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15 import org.eclipse.jface.internal.databinding.swt.SWTProperties;
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78
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16
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17 import java.lang.all;
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18
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19 import org.eclipse.core.databinding.observable.Diffs;
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20 import org.eclipse.core.databinding.observable.Realm;
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21 import org.eclipse.core.runtime.Assert;
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22 import org.eclipse.jface.internal.databinding.provisional.swt.AbstractSWTObservableValue;
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23 import org.eclipse.swt.events.ModifyEvent;
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24 import org.eclipse.swt.events.ModifyListener;
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25 import org.eclipse.swt.widgets.Spinner;
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26
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27 /**
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28 * @since 1.0
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29 *
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30 */
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31 public class SpinnerObservableValue : AbstractSWTObservableValue {
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32
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33 private final Spinner spinner;
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34
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35 private final String attribute;
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36
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37 private bool updating = false;
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38
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39 private int currentSelection;
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40
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41 private ModifyListener modifyListener;
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42
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43 /**
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44 * @param spinner
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45 * @param attribute
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46 */
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47 public this(Spinner spinner, String attribute) {
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48 super(spinner);
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49 this.spinner = spinner;
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50 this.attribute = attribute;
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51 init();
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52 }
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53
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54 /**
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55 * @param realm
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56 * @param spinner
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57 * @param attribute
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58 */
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59 public this(Realm realm, Spinner spinner, String attribute) {
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60 super(realm, spinner);
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61 this.spinner = spinner;
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62 this.attribute = attribute;
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63 init();
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64 }
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65
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66 private void init() {
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67 if (attribute.equals(SWTProperties.SELECTION)) {
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68 currentSelection = spinner.getSelection();
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69 modifyListener = new class() ModifyListener {
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70 public void modifyText(ModifyEvent e) {
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71 if (!updating) {
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72 int newSelection = this.outer.spinner
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73 .getSelection();
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74 notifyIfChanged(currentSelection, newSelection);
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75 currentSelection = newSelection;
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76 }
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77 }
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78 };
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79 spinner.addModifyListener(modifyListener);
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80 } else if (!attribute.equals(SWTProperties.MIN)
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81 && !attribute.equals(SWTProperties.MAX)) {
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82 throw new IllegalArgumentException(
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83 Format("Attribute name not valid: {}", attribute)); //$NON-NLS-1$
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84 }
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85 }
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86
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87 public void doSetValue(Object value) {
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88 int oldValue;
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89 int newValue;
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90 try {
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91 updating = true;
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92 newValue = (cast(Integer) value).intValue();
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93 if (attribute.equals(SWTProperties.SELECTION)) {
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94 oldValue = spinner.getSelection();
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95 spinner.setSelection(newValue);
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96 currentSelection = newValue;
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97 } else if (attribute.equals(SWTProperties.MIN)) {
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98 oldValue = spinner.getMinimum();
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99 spinner.setMinimum(newValue);
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100 } else if (attribute.equals(SWTProperties.MAX)) {
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101 oldValue = spinner.getMaximum();
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102 spinner.setMaximum(newValue);
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103 } else {
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104 Assert.isTrue(false, "invalid attribute name:" ~ attribute); //$NON-NLS-1$
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105 return;
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106 }
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107 notifyIfChanged(oldValue, newValue);
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108 } finally {
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109 updating = false;
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110 }
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111 }
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112
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113 public Object doGetValue() {
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114 int value = 0;
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115 if (attribute.equals(SWTProperties.SELECTION)) {
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116 value = spinner.getSelection();
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117 } else if (attribute.equals(SWTProperties.MIN)) {
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118 value = spinner.getMinimum();
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119 } else if (attribute.equals(SWTProperties.MAX)) {
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120 value = spinner.getMaximum();
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121 }
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122 return new Integer(value);
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123 }
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124
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125 public Object getValueType() {
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126 return Integer.TYPE;
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127 }
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128
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129 /**
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130 * @return attribute being observed
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131 */
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132 public String getAttribute() {
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133 return attribute;
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134 }
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135
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136 /*
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137 * (non-Javadoc)
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138 *
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139 * @see org.eclipse.core.databinding.observable.value.AbstractObservableValue#dispose()
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140 */
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141 public synchronized void dispose() {
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142 super.dispose();
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143 if (modifyListener !is null && !spinner.isDisposed()) {
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144 spinner.removeModifyListener(modifyListener);
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145 }
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146 }
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147
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148 private void notifyIfChanged(int oldValue, int newValue) {
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149 if (oldValue !is newValue) {
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150 fireValueChange(Diffs.createValueDiff(new Integer(oldValue),
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151 new Integer(newValue)));
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152 }
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153 }
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154 }
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