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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 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
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14 module dwtx.jface.text.PropagatingFontFieldEditor;
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15
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16 import dwt.dwthelper.utils;
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17
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18
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19
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20
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21 import dwt.graphics.FontData;
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22 import dwt.widgets.Composite;
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23 import dwt.widgets.Control;
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24 import dwt.widgets.Label;
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25 import dwtx.jface.preference.FontFieldEditor;
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26 import dwtx.jface.preference.IPreferenceStore;
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27 import dwtx.jface.preference.PreferenceConverter;
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28 import dwtx.jface.util.IPropertyChangeListener;
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29 import dwtx.jface.util.PropertyChangeEvent;
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30
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31
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32 /**
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33 * This font field editor implements chaining between a source preference
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34 * store and a target preference store. Any time the source preference
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35 * store changes, the change is propagated to the target store. Propagation
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36 * means that the actual value stored in the source store is set as default
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37 * value in the target store. If the target store does not contain a value
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38 * other than the default value, the new default value is immediately
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39 * effective.
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40 *
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41 * @see FontFieldEditor
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42 * @since 2.0
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43 * @deprecated since 3.0 not longer in use, no longer supported
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44 */
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45 public class PropagatingFontFieldEditor : FontFieldEditor {
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46
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47 /** The editor's parent widget */
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48 private Composite fParent;
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49 /** The representation of the default font choice */
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50 private String fDefaultFontLabel;
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51
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52 /**
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53 * Creates a new font field editor with the given parameters.
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54 *
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55 * @param name the editor's name
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56 * @param labelText the text shown as editor description
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57 * @param parent the editor's parent widget
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58 * @param defaultFontLabel the label shown in the editor value field when the default value should be taken
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59 */
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60 public PropagatingFontFieldEditor(String name, String labelText, Composite parent, String defaultFontLabel) {
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61 super(name, labelText, parent);
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62 fParent= parent;
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63 fDefaultFontLabel= defaultFontLabel is null ? "" : defaultFontLabel; //$NON-NLS-1$
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64 }
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65
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66 /*
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67 * @see FontFieldEditor#doLoad()
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68 */
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69 protected void doLoad() {
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70 if (getPreferenceStore().isDefault(getPreferenceName()))
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71 loadDefault();
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72 super.doLoad();
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73 checkForDefault();
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74 }
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75
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76 /*
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77 * @see FontFieldEditor#doLoadDefault()
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78 */
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79 protected void doLoadDefault() {
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80 super.doLoadDefault();
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81 checkForDefault();
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82 }
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83
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84 /**
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85 * Checks whether this editor presents the default value "inherited"
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86 * from the workbench rather than its own font.
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87 */
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88 private void checkForDefault() {
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89 if (presentsDefaultValue()) {
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90 Control c= getValueControl(fParent);
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91 if (c instanceof Label)
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92 ((Label) c).setText(fDefaultFontLabel);
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93 }
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94 }
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95
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96 /**
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97 * Propagates the font set in the source store to the
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98 * target store using the given keys.
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99 *
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100 * @param source the store from which to read the text font
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101 * @param sourceKey the key under which the font can be found
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102 * @param target the store to which to propagate the font
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103 * @param targetKey the key under which to store the font
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104 */
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105 private static void propagateFont(IPreferenceStore source, String sourceKey, IPreferenceStore target, String targetKey) {
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106 FontData fd= PreferenceConverter.getFontData(source, sourceKey);
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107 if (fd !is null) {
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108 bool isDefault= target.isDefault(targetKey); // save old state!
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109 PreferenceConverter.setDefault(target, targetKey, fd);
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110 if (isDefault) {
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111 // restore old state
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112 target.setToDefault(targetKey);
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113 }
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114 }
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115 }
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116
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117 /**
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118 * Starts the propagation of the font preference stored in the source preference
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119 * store under the source key to the target preference store using the target
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120 * preference key.
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121 *
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122 * @param source the source preference store
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123 * @param sourceKey the key to be used in the source preference store
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124 * @param target the target preference store
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125 * @param targetKey the key to be used in the target preference store
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126 */
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127 public static void startPropagate(final IPreferenceStore source, final String sourceKey, final IPreferenceStore target, final String targetKey) {
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128 source.addPropertyChangeListener(new IPropertyChangeListener() {
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129 public void propertyChange(PropertyChangeEvent event) {
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130 if (sourceKey.equals(event.getProperty()))
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131 propagateFont(source, sourceKey, target, targetKey);
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132 }
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133 });
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134
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135 propagateFont(source, sourceKey, target, targetKey);
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136 }
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137 }
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