annotate org.eclipse.jface/src/org/eclipse/jface/preference/ListEditor.d @ 12:bc29606a740c

Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 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 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.jface.preference.ListEditor;
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14
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15 import org.eclipse.jface.preference.FieldEditor;
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16
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17 import org.eclipse.swt.SWT;
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18 import org.eclipse.swt.events.DisposeEvent;
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19 import org.eclipse.swt.events.DisposeListener;
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20 import org.eclipse.swt.events.SelectionAdapter;
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21 import org.eclipse.swt.events.SelectionEvent;
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22 import org.eclipse.swt.events.SelectionListener;
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23 import org.eclipse.swt.layout.GridData;
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24 import org.eclipse.swt.layout.GridLayout;
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25 import org.eclipse.swt.widgets.Button;
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26 import org.eclipse.swt.widgets.Composite;
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27 import org.eclipse.swt.widgets.Control;
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28 import org.eclipse.swt.widgets.List;
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29 import org.eclipse.swt.widgets.Shell;
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30 import org.eclipse.swt.widgets.Widget;
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31 import org.eclipse.core.runtime.Assert;
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32 import org.eclipse.jface.dialogs.IDialogConstants;
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33 import org.eclipse.jface.resource.JFaceResources;
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34
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35 import java.lang.all;
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36 import java.util.Set;
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37
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38 /**
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39 * An abstract field editor that manages a list of input values.
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40 * The editor displays a list containing the values, buttons for
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41 * adding and removing values, and Up and Down buttons to adjust
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42 * the order of elements in the list.
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43 * <p>
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44 * Subclasses must implement the <code>parseString</code>,
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45 * <code>createList</code>, and <code>getNewInputObject</code>
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46 * framework methods.
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47 * </p>
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48 */
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49 public abstract class ListEditor : FieldEditor {
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50
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51 /**
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52 * The list widget; <code>null</code> if none
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53 * (before creation or after disposal).
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54 */
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55 private List list;
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56
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57 /**
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58 * The button box containing the Add, Remove, Up, and Down buttons;
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59 * <code>null</code> if none (before creation or after disposal).
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60 */
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61 private Composite buttonBox;
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62
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63 /**
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64 * The Add button.
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65 */
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66 private Button addButton;
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67
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68 /**
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69 * The Remove button.
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70 */
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71 private Button removeButton;
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72
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73 /**
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74 * The Up button.
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75 */
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76 private Button upButton;
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77
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78 /**
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79 * The Down button.
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80 */
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81 private Button downButton;
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82
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83 /**
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84 * The selection listener.
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85 */
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86 private SelectionListener selectionListener;
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87
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88 /**
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89 * Creates a new list field editor
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90 */
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91 protected this() {
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92 }
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93
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94 /**
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95 * Creates a list field editor.
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96 *
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97 * @param name the name of the preference this field editor works on
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98 * @param labelText the label text of the field editor
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99 * @param parent the parent of the field editor's control
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100 */
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101 protected this(String name, String labelText, Composite parent) {
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102 init(name, labelText);
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103 createControl(parent);
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104 }
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105
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106 /**
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107 * Notifies that the Add button has been pressed.
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108 */
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109 private void addPressed() {
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110 setPresentsDefaultValue(false);
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111 String input = getNewInputObject();
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112
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113 if (input !is null) {
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114 int index = list.getSelectionIndex();
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115 if (index >= 0) {
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116 list.add(input, index + 1);
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117 } else {
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118 list.add(input, 0);
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119 }
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120 selectionChanged();
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121 }
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122 }
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123
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124 /* (non-Javadoc)
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125 * Method declared on FieldEditor.
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126 */
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127 protected override void adjustForNumColumns(int numColumns) {
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128 Control control = getLabelControl();
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129 (cast(GridData) control.getLayoutData()).horizontalSpan = numColumns;
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130 (cast(GridData) list.getLayoutData()).horizontalSpan = numColumns - 1;
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131 }
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132
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133 /**
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134 * Creates the Add, Remove, Up, and Down button in the given button box.
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135 *
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136 * @param box the box for the buttons
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137 */
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138 private void createButtons(Composite box) {
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139 addButton = createPushButton(box, "ListEditor.add");//$NON-NLS-1$
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140 removeButton = createPushButton(box, "ListEditor.remove");//$NON-NLS-1$
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141 upButton = createPushButton(box, "ListEditor.up");//$NON-NLS-1$
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142 downButton = createPushButton(box, "ListEditor.down");//$NON-NLS-1$
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143 }
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144
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145 /**
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146 * Combines the given list of items into a single string.
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147 * This method is the converse of <code>parseString</code>.
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148 * <p>
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149 * Subclasses must implement this method.
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150 * </p>
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151 *
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152 * @param items the list of items
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153 * @return the combined string
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154 * @see #parseString
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155 */
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156 protected abstract String createList(String[] items);
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157
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158 /**
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159 * Helper method to create a push button.
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160 *
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161 * @param parent the parent control
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162 * @param key the resource name used to supply the button's label text
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163 * @return Button
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164 */
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165 private Button createPushButton(Composite parent, String key) {
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166 Button button = new Button(parent, SWT.PUSH);
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167 button.setText(JFaceResources.getString(key));
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168 button.setFont(parent.getFont());
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169 GridData data = new GridData(GridData.FILL_HORIZONTAL);
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170 int widthHint = convertHorizontalDLUsToPixels(button,
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171 IDialogConstants.BUTTON_WIDTH);
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172 data.widthHint = Math.max(widthHint, button.computeSize(SWT.DEFAULT,
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173 SWT.DEFAULT, true).x);
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174 button.setLayoutData(data);
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175 button.addSelectionListener(getSelectionListener());
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176 return button;
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177 }
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178
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179 /**
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180 * Creates a selection listener.
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181 */
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182 public void createSelectionListener() {
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183 selectionListener = new class SelectionAdapter {
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184 public void widgetSelected(SelectionEvent event) {
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185 Widget widget = event.widget;
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186 if (widget is addButton) {
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187 addPressed();
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188 } else if (widget is removeButton) {
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189 removePressed();
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190 } else if (widget is upButton) {
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191 upPressed();
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192 } else if (widget is downButton) {
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193 downPressed();
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194 } else if (widget is list) {
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195 selectionChanged();
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196 }
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197 }
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198 };
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199 }
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200
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201 /* (non-Javadoc)
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202 * Method declared on FieldEditor.
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203 */
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204 protected override void doFillIntoGrid(Composite parent, int numColumns) {
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205 Control control = getLabelControl(parent);
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206 GridData gd = new GridData();
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207 gd.horizontalSpan = numColumns;
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208 control.setLayoutData(gd);
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209
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210 list = getListControl(parent);
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211 gd = new GridData(GridData.FILL_HORIZONTAL);
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212 gd.verticalAlignment = GridData.FILL;
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213 gd.horizontalSpan = numColumns - 1;
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214 gd.grabExcessHorizontalSpace = true;
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215 list.setLayoutData(gd);
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216
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217 buttonBox = getButtonBoxControl(parent);
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218 gd = new GridData();
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219 gd.verticalAlignment = GridData.BEGINNING;
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220 buttonBox.setLayoutData(gd);
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221 }
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222
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223 /* (non-Javadoc)
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224 * Method declared on FieldEditor.
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225 */
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226 protected override void doLoad() {
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227 if (list !is null) {
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228 String s = getPreferenceStore().getString(getPreferenceName());
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229 String[] array = parseString(s);
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230 for (int i = 0; i < array.length; i++) {
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231 list.add(array[i]);
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232 }
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233 }
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234 }
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235
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236 /* (non-Javadoc)
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237 * Method declared on FieldEditor.
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238 */
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239 protected override void doLoadDefault() {
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240 if (list !is null) {
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241 list.removeAll();
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242 String s = getPreferenceStore().getDefaultString(
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243 getPreferenceName());
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244 String[] array = parseString(s);
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245 for (int i = 0; i < array.length; i++) {
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246 list.add(array[i]);
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247 }
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248 }
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249 }
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250
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251 /* (non-Javadoc)
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252 * Method declared on FieldEditor.
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253 */
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254 protected override void doStore() {
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255 String s = createList(list.getItems());
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256 if (s !is null) {
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257 getPreferenceStore().setValue(getPreferenceName(), s);
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258 }
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259 }
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260
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261 /**
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262 * Notifies that the Down button has been pressed.
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263 */
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264 private void downPressed() {
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265 swap(false);
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266 }
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267
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268 /**
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269 * Returns this field editor's button box containing the Add, Remove,
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270 * Up, and Down button.
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271 *
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272 * @param parent the parent control
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273 * @return the button box
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274 */
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275 public Composite getButtonBoxControl(Composite parent) {
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276 if (buttonBox is null) {
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277 buttonBox = new Composite(parent, SWT.NULL);
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278 GridLayout layout = new GridLayout();
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279 layout.marginWidth = 0;
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280 buttonBox.setLayout(layout);
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281 createButtons(buttonBox);
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282 buttonBox.addDisposeListener(new class DisposeListener {
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283 public void widgetDisposed(DisposeEvent event) {
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284 addButton = null;
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285 removeButton = null;
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286 upButton = null;
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287 downButton = null;
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288 buttonBox = null;
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289 }
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290 });
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291
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292 } else {
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293 checkParent(buttonBox, parent);
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294 }
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295
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296 selectionChanged();
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297 return buttonBox;
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298 }
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299
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300 /**
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301 * Returns this field editor's list control.
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302 *
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303 * @param parent the parent control
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304 * @return the list control
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305 */
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306 public List getListControl(Composite parent) {
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307 if (list is null) {
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308 list = new List(parent, SWT.BORDER | SWT.SINGLE | SWT.V_SCROLL
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309 | SWT.H_SCROLL);
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310 list.setFont(parent.getFont());
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311 list.addSelectionListener(getSelectionListener());
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312 list.addDisposeListener(new class DisposeListener {
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313 public void widgetDisposed(DisposeEvent event) {
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314 list = null;
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315 }
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316 });
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317 } else {
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318 checkParent(list, parent);
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319 }
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320 return list;
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321 }
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322
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323 /**
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324 * Creates and returns a new item for the list.
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325 * <p>
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326 * Subclasses must implement this method.
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327 * </p>
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328 *
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329 * @return a new item
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330 */
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331 protected abstract String getNewInputObject();
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332
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333 /* (non-Javadoc)
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334 * Method declared on FieldEditor.
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335 */
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336 public override int getNumberOfControls() {
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337 return 2;
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338 }
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339
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340 /**
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341 * Returns this field editor's selection listener.
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342 * The listener is created if nessessary.
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343 *
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344 * @return the selection listener
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345 */
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346 private SelectionListener getSelectionListener() {
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347 if (selectionListener is null) {
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348 createSelectionListener();
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349 }
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350 return selectionListener;
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351 }
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352
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353 /**
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354 * Returns this field editor's shell.
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355 * <p>
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356 * This method is internal to the framework; subclassers should not call
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357 * this method.
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358 * </p>
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359 *
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360 * @return the shell
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361 */
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362 protected Shell getShell() {
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363 if (addButton is null) {
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364 return null;
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365 }
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366 return addButton.getShell();
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367 }
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368
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369 /**
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370 * Splits the given string into a list of strings.
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371 * This method is the converse of <code>createList</code>.
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372 * <p>
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373 * Subclasses must implement this method.
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374 * </p>
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375 *
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376 * @param stringList the string
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377 * @return an array of <code>String</code>
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378 * @see #createList
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379 */
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380 protected abstract String[] parseString(String stringList);
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381
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382 /**
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383 * Notifies that the Remove button has been pressed.
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384 */
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385 private void removePressed() {
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386 setPresentsDefaultValue(false);
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387 int index = list.getSelectionIndex();
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388 if (index >= 0) {
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389 list.remove(index);
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390 selectionChanged();
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391 }
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392 }
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393
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394 /**
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395 * Notifies that the list selection has changed.
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396 */
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397 private void selectionChanged() {
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398
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399 int index = list.getSelectionIndex();
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400 int size = list.getItemCount();
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401
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402 removeButton.setEnabled(index >= 0);
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403 upButton.setEnabled(size > 1 && index > 0);
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404 downButton.setEnabled(size > 1 && index >= 0 && index < size - 1);
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405 }
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406
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407 /* (non-Javadoc)
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408 * Method declared on FieldEditor.
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409 */
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410 public override void setFocus() {
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411 if (list !is null) {
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412 list.setFocus();
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413 }
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414 }
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415
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416 /**
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417 * Moves the currently selected item up or down.
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parents:
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418 *
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419 * @param up <code>true</code> if the item should move up,
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420 * and <code>false</code> if it should move down
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421 */
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422 private void swap(bool up) {
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423 setPresentsDefaultValue(false);
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424 int index = list.getSelectionIndex();
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425 int target = up ? index - 1 : index + 1;
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426
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diff changeset
427 if (index >= 0) {
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diff changeset
428 String[] selection = list.getSelection();
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429 Assert.isTrue(selection.length is 1);
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430 list.remove(index);
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diff changeset
431 list.add(selection[0], target);
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432 list.setSelection(target);
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433 }
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diff changeset
434 selectionChanged();
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435 }
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parents:
diff changeset
436
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parents:
diff changeset
437 /**
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438 * Notifies that the Up button has been pressed.
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parents:
diff changeset
439 */
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diff changeset
440 private void upPressed() {
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441 swap(true);
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442 }
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diff changeset
443
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parents:
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444 /*
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445 * @see FieldEditor.setEnabled(bool,Composite).
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446 */
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447 public override void setEnabled(bool enabled, Composite parent) {
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448 super.setEnabled(enabled, parent);
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449 getListControl(parent).setEnabled(enabled);
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diff changeset
450 addButton.setEnabled(enabled);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
451 removeButton.setEnabled(enabled);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
452 upButton.setEnabled(enabled);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
453 downButton.setEnabled(enabled);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
454 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
455 }