Mercurial > projects > dwt2
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> |
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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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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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427 if (index >= 0) { |
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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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431 list.add(selection[0], target); |
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432 list.setSelection(target); |
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433 } |
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434 selectionChanged(); |
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435 } |
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436 |
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437 /** |
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438 * Notifies that the Up button has been pressed. |
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439 */ |
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440 private void upPressed() { |
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441 swap(true); |
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442 } |
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443 |
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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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450 addButton.setEnabled(enabled); |
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451 removeButton.setEnabled(enabled); |
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452 upButton.setEnabled(enabled); |
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453 downButton.setEnabled(enabled); |
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454 } |
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455 } |