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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 * Peter Centgraf - bug 175763
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11 *******************************************************************************/
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12 module org.eclipse.jface.internal.databinding.swt.ScaleObservableValue;
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85
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13 import org.eclipse.jface.internal.databinding.swt.SWTProperties;
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78
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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.core.runtime.Assert;
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20 import org.eclipse.jface.internal.databinding.provisional.swt.AbstractSWTObservableValue;
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21 import org.eclipse.swt.events.SelectionAdapter;
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22 import org.eclipse.swt.events.SelectionEvent;
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23 import org.eclipse.swt.events.SelectionListener;
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24 import org.eclipse.swt.widgets.Scale;
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25
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26 /**
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27 * @since 1.0
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28 *
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29 */
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30 public class ScaleObservableValue : AbstractSWTObservableValue {
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31
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32 private final Scale scale;
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33
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34 private final String attribute;
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35
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36 private bool updating = false;
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37
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38 private int currentSelection;
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39
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40 private SelectionListener listener;
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41
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42 /**
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43 * @param scale
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44 * @param attribute
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45 */
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46 public this(Scale scale, String attribute) {
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47 super(scale);
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48 this.scale = scale;
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49 this.attribute = attribute;
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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 scale
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56 * @param attribute
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57 */
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58 public this(Realm realm, Scale scale, String attribute) {
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59 super(realm, scale);
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60 this.scale = scale;
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61 this.attribute = attribute;
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62 init();
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63 }
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64
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65 private void init() {
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66 if (attribute.equals(SWTProperties.SELECTION)) {
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67 currentSelection = scale.getSelection();
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68 scale.addSelectionListener(listener = new class() SelectionAdapter {
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69 public void widgetSelected(SelectionEvent e) {
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70 if (!updating) {
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71 int newSelection = this.outer.scale
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72 .getSelection();
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73 notifyIfChanged(currentSelection, newSelection);
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74 currentSelection = newSelection;
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75 }
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76 }
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77 });
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78 } else if (!attribute.equals(SWTProperties.MIN)
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79 && !attribute.equals(SWTProperties.MAX)) {
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80 throw new IllegalArgumentException(
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81 "Attribute name not valid: " ~ attribute); //$NON-NLS-1$
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82 }
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83 }
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84
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85 public void doSetValue(Object value) {
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86 int oldValue;
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87 int newValue;
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88 try {
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89 updating = true;
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90 newValue = (cast(Integer) value).intValue();
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91 if (attribute.equals(SWTProperties.SELECTION)) {
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92 oldValue = scale.getSelection();
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93 scale.setSelection(newValue);
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94 currentSelection = newValue;
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95 } else if (attribute.equals(SWTProperties.MIN)) {
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96 oldValue = scale.getMinimum();
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97 scale.setMinimum(newValue);
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98 } else if (attribute.equals(SWTProperties.MAX)) {
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99 oldValue = scale.getMaximum();
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100 scale.setMaximum(newValue);
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101 } else {
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102 Assert.isTrue(false, "invalid attribute name:" ~ attribute); //$NON-NLS-1$
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103 return;
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104 }
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105
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106 notifyIfChanged(oldValue, newValue);
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107 } finally {
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108 updating = false;
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109 }
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110 }
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111
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112 public Object doGetValue() {
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113 int value = 0;
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114 if (attribute.equals(SWTProperties.SELECTION)) {
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115 value = scale.getSelection();
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116 } else if (attribute.equals(SWTProperties.MIN)) {
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117 value = scale.getMinimum();
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118 } else if (attribute.equals(SWTProperties.MAX)) {
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119 value = scale.getMaximum();
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120 }
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121 return new Integer(value);
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122 }
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123
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124 public Object getValueType() {
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125 return Integer.TYPE;
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126 }
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127
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128 /**
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129 * @return attribute being observed
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130 */
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131 public String getAttribute() {
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132 return attribute;
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133 }
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134
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135 /* (non-Javadoc)
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136 * @see org.eclipse.core.databinding.observable.value.AbstractObservableValue#dispose()
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137 */
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138 public synchronized void dispose() {
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139 super.dispose();
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140
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141 if (listener !is null && !scale.isDisposed()) {
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142 scale.removeSelectionListener(listener);
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143 }
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144 listener = null;
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145 }
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146
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147 private void notifyIfChanged(int oldValue, int newValue) {
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148 if (oldValue !is newValue) {
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149 fireValueChange(Diffs.createValueDiff(new Integer(oldValue),
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150 new Integer(newValue)));
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151 }
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152 }
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153 }
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