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