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annotate dwt/custom/PopupList.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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children 1a8b3cb347e0
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 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 *******************************************************************************/
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11 module dwt.custom;
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12
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13 import dwt.*;
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14 import dwt.events.*;
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15 import dwt.graphics.*;
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16 import dwt.widgets.*;
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17 /**
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18 * A PopupList is a list of selectable items that appears in its own shell positioned above
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19 * its parent shell. It is used for selecting items when editing a Table cell (similar to the
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20 * list that appears when you open a Combo box).
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21 *
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22 * The list will be positioned so that it does not run off the screen and the largest number of items
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23 * are visible. It may appear above the current cursor location or below it depending how close you
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24 * are to the edge of the screen.
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25 */
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26 public class PopupList {
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27 Shell shell;
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28 List list;
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29 int minimumWidth;
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30 /**
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31 * Creates a PopupList above the specified shell.
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32 *
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33 * @param parent a Shell control which will be the parent of the new instance (cannot be null)
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34 */
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35 public PopupList(Shell parent) {
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36 this (parent, 0);
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37 }
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38 /**
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39 * Creates a PopupList above the specified shell.
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40 *
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41 * @param parent a widget which will be the parent of the new instance (cannot be null)
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42 * @param style the style of widget to construct
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43 *
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44 * @since 3.0
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45 */
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46 public PopupList(Shell parent, int style) {
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47 shell = new Shell(parent, checkStyle(style));
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48
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49 list = new List(shell, DWT.SINGLE | DWT.V_SCROLL);
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50
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51 // close dialog if user selects outside of the shell
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52 shell.addListener(DWT.Deactivate, new Listener() {
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53 public void handleEvent(Event e){
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54 shell.setVisible (false);
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55 }
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56 });
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57
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58 // resize shell when list resizes
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59 shell.addControlListener(new ControlListener() {
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60 public void controlMoved(ControlEvent e){}
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61 public void controlResized(ControlEvent e){
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62 Rectangle shellSize = shell.getClientArea();
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63 list.setSize(shellSize.width, shellSize.height);
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64 }
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65 });
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66
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67 // return list selection on Mouse Up or Carriage Return
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68 list.addMouseListener(new MouseListener() {
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69 public void mouseDoubleClick(MouseEvent e){}
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70 public void mouseDown(MouseEvent e){}
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71 public void mouseUp(MouseEvent e){
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72 shell.setVisible (false);
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73 }
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74 });
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75 list.addKeyListener(new KeyListener() {
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76 public void keyReleased(KeyEvent e){}
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77 public void keyPressed(KeyEvent e){
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78 if (e.character is '\r'){
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79 shell.setVisible (false);
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80 }
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81 }
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82 });
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83
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84 }
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85 private static int checkStyle (int style) {
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86 int mask = DWT.LEFT_TO_RIGHT | DWT.RIGHT_TO_LEFT;
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87 return style & mask;
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88 }
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89 /**
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90 * Gets the widget font.
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91 * <p>
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92 * @return the widget font
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93 *
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94 * @exception DWTException <ul>
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95 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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96 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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97 * </ul>
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98 */
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99 public Font getFont () {
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100 return list.getFont();
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101 }
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102 /**
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103 * Gets the items.
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104 * <p>
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105 * This operation will fail if the items cannot
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106 * be queried from the OS.
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107 *
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108 * @return the items in the widget
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109 *
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110 * @exception DWTException <ul>
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111 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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112 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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113 * </ul>
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114 */
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115 public String[] getItems () {
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116 return list.getItems();
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117 }
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118 /**
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119 * Gets the minimum width of the list.
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120 *
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121 * @return the minimum width of the list
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122 */
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123 public int getMinimumWidth () {
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124 return minimumWidth;
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125 }
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126 /**
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127 * Launches the Popup List, waits for an item to be selected and then closes the PopupList.
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128 *
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129 * @param rect the initial size and location of the PopupList; the dialog will be
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130 * positioned so that it does not run off the screen and the largest number of items are visible
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131 *
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132 * @return the text of the selected item or null if no item is selected
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133 */
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134 public String open (Rectangle rect) {
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135
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136 Point listSize = list.computeSize (rect.width, DWT.DEFAULT, false);
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137 Rectangle screenSize = shell.getDisplay().getBounds();
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138
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139 // Position the dialog so that it does not run off the screen and the largest number of items are visible
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140 int spaceBelow = screenSize.height - (rect.y + rect.height) - 30;
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141 int spaceAbove = rect.y - 30;
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142
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143 int y = 0;
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144 if (spaceAbove > spaceBelow && listSize.y > spaceBelow) {
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145 // place popup list above table cell
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146 if (listSize.y > spaceAbove){
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147 listSize.y = spaceAbove;
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148 } else {
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149 listSize.y += 2;
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150 }
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151 y = rect.y - listSize.y;
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152
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153 } else {
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154 // place popup list below table cell
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155 if (listSize.y > spaceBelow){
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156 listSize.y = spaceBelow;
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157 } else {
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158 listSize.y += 2;
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159 }
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160 y = rect.y + rect.height;
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161 }
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162
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163 // Make dialog as wide as the cell
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164 listSize.x = rect.width;
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165 // dialog width should not be less than minimumWidth
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166 if (listSize.x < minimumWidth)
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167 listSize.x = minimumWidth;
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168
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169 // Align right side of dialog with right side of cell
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170 int x = rect.x + rect.width - listSize.x;
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171
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172 shell.setBounds(x, y, listSize.x, listSize.y);
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173
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174 shell.open();
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175 list.setFocus();
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176
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177 Display display = shell.getDisplay();
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178 while (!shell.isDisposed () && shell.isVisible ()) {
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179 if (!display.readAndDispatch()) display.sleep();
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180 }
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181
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182 String result = null;
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183 if (!shell.isDisposed ()) {
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184 String [] Strings = list.getSelection ();
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185 shell.dispose();
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186 if (Strings.length !is 0) result = Strings [0];
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187 }
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188 return result;
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189 }
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190 /**
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191 * Selects an item with text that starts with specified String.
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192 * <p>
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193 * If the item is not currently selected, it is selected.
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194 * If the item at an index is selected, it remains selected.
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195 * If the String is not matched, it is ignored.
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196 *
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197 * @param String the text of the item
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198 *
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199 * @exception DWTException <ul>
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200 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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201 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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202 * </ul>
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203 */
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204 public void select(String String) {
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205 String[] items = list.getItems();
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206
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207 // find the first entry in the list that starts with the
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208 // specified String
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209 if (String !is null){
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210 for (int i = 0; i < items.length; i++) {
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211 if (items[i].startsWith(String)){
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212 int index = list.indexOf(items[i]);
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213 list.select(index);
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214 break;
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215 }
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216 }
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217 }
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218 }
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219 /**
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220 * Sets the widget font.
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221 * <p>
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222 * When new font is null, the font reverts
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223 * to the default system font for the widget.
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224 *
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225 * @param font the new font (or null)
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226 *
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227 * @exception DWTException <ul>
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228 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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229 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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230 * </ul>
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231 */
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232 public void setFont (Font font) {
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233 list.setFont(font);
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234 }
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235 /**
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236 * Sets all items.
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237 * <p>
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238 * The previous selection is cleared.
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239 * The previous items are deleted.
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240 * The new items are added.
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241 * The top index is set to 0.
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242 *
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243 * @param Strings the array of items
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244 *
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245 * This operation will fail when an item is null
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246 * or could not be added in the OS.
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247 *
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248 * @exception IllegalArgumentException <ul>
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249 * <li>ERROR_NULL_ARGUMENT - if the items array is null</li>
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250 * <li>ERROR_INVALID_ARGUMENT - if an item in the items array is null</li>
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251 * </ul>
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252 * @exception DWTException <ul>
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253 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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254 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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255 * </ul>
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256 */
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257 public void setItems (String[] Strings) {
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258 list.setItems(Strings);
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259 }
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260 /**
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261 * Sets the minimum width of the list.
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262 *
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263 * @param width the minimum width of the list
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264 */
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265 public void setMinimumWidth (int width) {
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266 if (width < 0)
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267 DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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268
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269 minimumWidth = width;
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270 }
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271 }