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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 * Eric Rizzo - bug 134884
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14 *******************************************************************************/
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15 module org.eclipse.jface.internal.databinding.swt.CComboObservableValue;
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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.custom.CCombo;
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24 import org.eclipse.swt.events.ModifyEvent;
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25 import org.eclipse.swt.events.ModifyListener;
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26
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27 /**
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28 * @since 3.2
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29 *
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30 */
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31 public class CComboObservableValue : AbstractSWTObservableValue {
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32
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33 /**
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34 *
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35 */
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36
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37 private final CCombo ccombo;
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38
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39 private final String attribute;
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40
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41 private bool updating = false;
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42
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43 private String currentValue;
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44
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45 private ModifyListener modifyListener;
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46
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47 /**
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48 * @param ccombo
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49 * @param attribute
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50 */
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51 public this(CCombo ccombo, String attribute) {
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52 super(ccombo);
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53 this.ccombo = ccombo;
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54 this.attribute = attribute;
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55 init();
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56 }
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57
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58 /**
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59 * @param realm
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60 * @param ccombo
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61 * @param attribute
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62 */
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63 public this(Realm realm, CCombo ccombo, String attribute) {
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64 super(realm, ccombo);
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65 this.ccombo = ccombo;
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66 this.attribute = attribute;
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67 init();
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68 }
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69
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70 private void init() {
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71 if (attribute.equals(SWTProperties.SELECTION)
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72 || attribute.equals(SWTProperties.TEXT)) {
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73 this.currentValue = ccombo.getText();
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74 modifyListener = new class() ModifyListener {
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75
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76 public void modifyText(ModifyEvent e) {
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77 if (!updating) {
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78 String oldValue = currentValue;
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79 currentValue = this.outer.ccombo
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80 .getText();
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81
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82 notifyIfChanged(oldValue, currentValue);
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83 }
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84 }
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85 };
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86 ccombo.addModifyListener(modifyListener);
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87 } else
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88 throw new IllegalArgumentException();
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89 }
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90
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91 public void doSetValue(Object value) {
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92 String oldValue = ccombo.getText();
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93 try {
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94 updating = true;
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95 if (attribute.equals(SWTProperties.TEXT)) {
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96 String stringValue = value !is null ? value.toString() : ""; //$NON-NLS-1$
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97 ccombo.setText(stringValue);
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98 } else if (attribute.equals(SWTProperties.SELECTION)) {
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99 String items[] = ccombo.getItems();
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100 int index = -1;
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101 if (value is null) {
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102 ccombo.select(-1);
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103 } else if (items !is null) {
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104 for (int i = 0; i < items.length; i++) {
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105 if (value.equals(items[i])) {
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106 index = i;
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107 break;
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108 }
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109 }
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110 if (index is -1) {
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111 ccombo.setText(cast(String) value);
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112 } else {
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113 ccombo.select(index); // -1 will not "unselect"
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114 }
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115 }
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116 }
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117 } finally {
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118 updating = false;
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119 currentValue = ccombo.getText();
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120 }
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121
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122 notifyIfChanged(oldValue, currentValue);
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123 }
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124
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125 public Object doGetValue() {
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126 if (attribute.equals(SWTProperties.TEXT))
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127 return ccombo.getText();
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128
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129 Assert.isTrue(attribute.equals(SWTProperties.SELECTION),
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130 "unexpected attribute: " + attribute); //$NON-NLS-1$
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131 // The problem with a ccombo, is that it changes the text and
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132 // fires before it update its selection index
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133 return ccombo.getText();
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134 }
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135
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136 public Object getValueType() {
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137 Assert.isTrue(attribute.equals(SWTProperties.TEXT)
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138 || attribute.equals(SWTProperties.SELECTION),
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139 "unexpected attribute: " + attribute); //$NON-NLS-1$
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140 return String.classinfo;
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141 }
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142
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143 /**
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144 * @return attribute being observed
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145 */
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146 public String getAttribute() {
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147 return attribute;
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148 }
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149
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150 /*
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151 * (non-Javadoc)
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152 *
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153 * @see org.eclipse.core.databinding.observable.value.AbstractObservableValue#dispose()
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154 */
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155 public synchronized void dispose() {
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156 super.dispose();
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157
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158 if (modifyListener !is null && !ccombo.isDisposed()) {
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159 ccombo.removeModifyListener(modifyListener);
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160 }
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161 }
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162
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163 private void notifyIfChanged(String oldValue, String newValue) {
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164 if (!oldValue.equals(newValue)) {
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165 fireValueChange(Diffs.createValueDiff(oldValue, ccombo.getText()));
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166 }
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167 }
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168 }
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