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

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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 * Thierry Lach - thierry.lach@bbdodetroit.com - Fix for Bug 37155
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11 * Port to the D programming language:
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12 * Frank Benoit <benoit@tionex.de>
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13 *******************************************************************************/
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14 module org.eclipse.jface.preference.StringButtonFieldEditor;
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15
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16 import org.eclipse.jface.preference.StringFieldEditor;
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17
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18 import org.eclipse.swt.SWT;
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19 import org.eclipse.swt.events.DisposeEvent;
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20 import org.eclipse.swt.events.DisposeListener;
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21 import org.eclipse.swt.events.SelectionAdapter;
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22 import org.eclipse.swt.events.SelectionEvent;
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23 import org.eclipse.swt.graphics.Point;
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24 import org.eclipse.swt.layout.GridData;
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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.Shell;
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28 import org.eclipse.core.runtime.Assert;
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29 import org.eclipse.jface.dialogs.IDialogConstants;
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30 import org.eclipse.jface.resource.JFaceResources;
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31
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32 import java.lang.all;
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33 import java.util.Set;
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34
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35 /**
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36 * An abstract field editor for a string type preference that presents
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37 * a string input field with a change button to its right to edit the
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38 * input field's content. When the user presses the change button, the
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39 * abstract framework method <code>changePressed()</code> gets called
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40 * to compute a new string.
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41 */
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42 public abstract class StringButtonFieldEditor : StringFieldEditor {
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43
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44 /**
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45 * The change button, or <code>null</code> if none
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46 * (before creation and after disposal).
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47 */
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48 private Button changeButton;
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49
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50 /**
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51 * The text for the change button, or <code>null</code> if missing.
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52 */
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53 private String changeButtonText;
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54
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55 /**
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56 * Creates a new string button field editor
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57 */
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58 protected this() {
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59 }
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60
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61 /**
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62 * Creates a string button field editor.
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63 *
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64 * @param name the name of the preference this field editor works on
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65 * @param labelText the label text of the field editor
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66 * @param parent the parent of the field editor's control
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67 */
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68 protected this(String name, String labelText,
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69 Composite parent) {
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70 init(name, labelText);
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71 createControl(parent);
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72 }
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73
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74 /* (non-Javadoc)
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75 * Method declared on FieldEditor.
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76 */
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77 protected override void adjustForNumColumns(int numColumns) {
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78 (cast(GridData) getTextControl().getLayoutData()).horizontalSpan = numColumns - 2;
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79 }
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80
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81 /**
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82 * Notifies that this field editor's change button has been pressed.
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83 * <p>
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84 * Subclasses must implement this method to provide a corresponding
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85 * new string for the text field. If the returned value is <code>null</code>,
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86 * the currently displayed value remains.
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87 * </p>
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88 *
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89 * @return the new string to display, or <code>null</code> to leave the
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90 * old string showing
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91 */
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92 protected abstract String changePressed();
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93
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94 /* (non-Javadoc)
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95 * Method declared on StringFieldEditor (and FieldEditor).
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96 */
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97 protected override void doFillIntoGrid(Composite parent, int numColumns) {
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98 super.doFillIntoGrid(parent, numColumns - 1);
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99 changeButton = getChangeControl(parent);
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100 GridData gd = new GridData();
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101 gd.horizontalAlignment = GridData.FILL;
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102 int widthHint = convertHorizontalDLUsToPixels(changeButton,
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103 IDialogConstants.BUTTON_WIDTH);
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104 gd.widthHint = Math.max(widthHint, changeButton.computeSize(
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105 SWT.DEFAULT, SWT.DEFAULT, true).x);
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106 changeButton.setLayoutData(gd);
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107 }
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108
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109 /**
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110 * Get the change control. Create it in parent if required.
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111 * @param parent
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112 * @return Button
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113 */
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114 protected Button getChangeControl(Composite parent) {
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115 if (changeButton is null) {
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116 changeButton = new Button(parent, SWT.PUSH);
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117 if (changeButtonText is null) {
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118 changeButtonText = JFaceResources.getString("openChange"); //$NON-NLS-1$
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119 }
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120 changeButton.setText(changeButtonText);
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121 changeButton.setFont(parent.getFont());
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122 changeButton.addSelectionListener(new class SelectionAdapter {
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123 public void widgetSelected(SelectionEvent evt) {
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124 String newValue = changePressed();
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125 if (newValue !is null) {
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126 setStringValue(newValue);
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127 }
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128 }
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129 });
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130 changeButton.addDisposeListener(new class DisposeListener {
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131 public void widgetDisposed(DisposeEvent event) {
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132 changeButton = null;
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133 }
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134 });
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135 } else {
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136 checkParent(changeButton, parent);
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137 }
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138 return changeButton;
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139 }
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140
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141 /* (non-Javadoc)
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142 * Method declared on FieldEditor.
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143 */
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144 public override int getNumberOfControls() {
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145 return 3;
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146 }
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147
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148 /**
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149 * Returns this field editor's shell.
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150 *
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151 * @return the shell
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152 */
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153 protected Shell getShell() {
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154 if (changeButton is null) {
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155 return null;
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156 }
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157 return changeButton.getShell();
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158 }
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159
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160 /**
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161 * Sets the text of the change button.
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162 *
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163 * @param text the new text
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164 */
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165 public void setChangeButtonText(String text) {
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166 Assert.isNotNull(text);
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167 changeButtonText = text;
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168 if (changeButton !is null) {
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169 changeButton.setText(text);
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170 Point prefSize = changeButton.computeSize(SWT.DEFAULT, SWT.DEFAULT);
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171 GridData data = cast(GridData)changeButton.getLayoutData();
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172 data.widthHint = Math.max(SWT.DEFAULT, prefSize.x);
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173 }
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174 }
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175
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176 /* (non-Javadoc)
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177 * @see org.eclipse.jface.preference.FieldEditor#setEnabled(bool, org.eclipse.swt.widgets.Composite)
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178 */
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179 public override void setEnabled(bool enabled, Composite parent) {
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180 super.setEnabled(enabled, parent);
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181 if (changeButton !is null) {
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182 changeButton.setEnabled(enabled);
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183 }
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184 }
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185
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186 }