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annotate org.eclipse.jface/src/org/eclipse/jface/bindings/keys/KeyStroke.d @ 35:634e4380db78

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author Frank Benoit <benoit@tionex.de>
date Mon, 23 Mar 2009 18:28:04 +0100
parents bc29606a740c
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1 /*******************************************************************************
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2 * Copyright (c) 2004, 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
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14 module org.eclipse.jface.bindings.keys.KeyStroke;
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16 import org.eclipse.jface.bindings.keys.IKeyLookup;
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17 import org.eclipse.jface.bindings.keys.KeyLookupFactory;
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18
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19 import org.eclipse.jface.bindings.Trigger;
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20 import org.eclipse.jface.bindings.keys.formatting.KeyFormatterFactory;
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21 import org.eclipse.jface.util.Util;
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22
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23 import java.lang.all;
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24 import java.util.Set;
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25 import java.text.ParseException;
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26 static import tango.text.Util;
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27 /**
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28 * <p>
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29 * A <code>KeyStroke</code> is defined as an optional set of modifier keys
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30 * followed optionally by a natural key. A <code>KeyStroke</code> is said to
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31 * be complete if it contains a natural key. A natural key is any Unicode
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32 * character (e.g., "backspace", etc.), any character belonging to a natural
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33 * language (e.g., "A", "1", "[", etc.), or any special control character
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34 * specific to computers (e.g., "F10", "PageUp", etc.).
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35 * </p>
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36 * <p>
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37 * All <code>KeyStroke</code> objects have a formal string representation
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38 * available via the <code>toString()</code> method. There are a number of
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39 * methods to get instances of <code>KeyStroke</code> objects, including one
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40 * which can parse this formal string representation.
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41 * </p>
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42 * <p>
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43 * All <code>KeyStroke</code> objects, via the <code>format()</code> method,
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44 * provide a version of their formal string representation translated by
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45 * platform and locale, suitable for display to a user.
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46 * </p>
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47 * <p>
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48 * <code>KeyStroke</code> objects are immutable. Clients are not permitted to
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49 * extend this class.
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50 * </p>
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51 *
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52 * @since 3.1
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53 */
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54 public final class KeyStroke : Trigger, Comparable {
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55
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56 /**
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57 * The delimiter between multiple keys in a single key strokes -- expressed
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58 * in the formal key stroke grammar. This is not to be displayed to the
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59 * user. It is only intended as an internal representation.
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60 */
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61 public static const String KEY_DELIMITER = "\u002B"; //$NON-NLS-1$
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62
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63 /**
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64 * The set of delimiters for <code>Key</code> objects allowed during
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65 * parsing of the formal string representation.
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66 */
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67 public static const String KEY_DELIMITERS = KEY_DELIMITER;
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68
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69 /**
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70 * The representation for no key.
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71 */
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72 public static const int NO_KEY = 0;
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73
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74 /**
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75 * Creates an instance of <code>KeyStroke</code> given a natural key.
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76 *
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77 * @param naturalKey
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78 * the natural key. The format of this integer is defined by
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79 * whichever widget toolkit you are using; <code>NO_KEY</code>
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80 * always means no natural key.
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81 * @return a key stroke. This key stroke will have no modifier keys.
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82 * Guaranteed not to be <code>null</code>.
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83 * @see SWTKeySupport
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84 */
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85 public static final KeyStroke getInstance(int naturalKey) {
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86 return new KeyStroke(NO_KEY, naturalKey);
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87 }
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88
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89 /**
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90 * Creates an instance of <code>KeyStroke</code> given a set of modifier keys
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91 * and a natural key.
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92 *
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93 * @param modifierKeys
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94 * the modifier keys. The format of this integer is defined by
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95 * whichever widget toolkit you are using; <code>NO_KEY</code>
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96 * always means no modifier keys.
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97 * @param naturalKey
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98 * the natural key. The format of this integer is defined by
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99 * whichever widget toolkit you are using; <code>NO_KEY</code>
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100 * always means no natural key.
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101 * @return a key stroke. Guaranteed not to be <code>null</code>.
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102 * @see SWTKeySupport
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103 */
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104 public static final KeyStroke getInstance(int modifierKeys,
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105 int naturalKey) {
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106 return new KeyStroke(modifierKeys, naturalKey);
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107 }
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108
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109 /**
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110 * Creates an instance of <code>KeyStroke</code> by parsing a given a formal
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111 * string representation.
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112 *
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113 * @param string
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114 * the formal string representation to parse.
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115 * @return a key stroke. Guaranteed not to be <code>null</code>.
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116 * @throws ParseException
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117 * if the given formal string representation could not be parsed
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118 * to a valid key stroke.
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119 */
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120 public static final KeyStroke getInstance(String string) {
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121 if (string is null) {
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122 throw new NullPointerException("Cannot parse a null string"); //$NON-NLS-1$
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123 }
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124
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125 IKeyLookup lookup = KeyLookupFactory.getDefault();
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126 int modifierKeys = NO_KEY;
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127 int naturalKey = NO_KEY;
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128 int i = 0;
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129
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130 auto tokens = tango.text.Util.delimit( string, KEY_DELIMITERS );
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131 foreach( idx, token; tokens ){
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132
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133 if (i % 2 is 0) {
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134 if ( idx+1 < tokens.length ) {
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135 token = token.toUpperCase();
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136 int modifierKey = lookup.formalModifierLookup(token);
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137 if (modifierKey is NO_KEY) {
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138 throw new ParseException(
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139 "Cannot create key stroke with duplicate or non-existent modifier key: " //$NON-NLS-1$
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140 ~ token);
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141 }
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142
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143 modifierKeys |= modifierKey;
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144
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145 } else if (token.length is 1) {
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146 naturalKey = token.charAt(0);
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147
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148 } else {
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149 token = token.toUpperCase();
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150 naturalKey = lookup.formalKeyLookup(token);
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151 }
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152 }
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153
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154 i++;
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155 }
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156
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157 return new KeyStroke(modifierKeys, naturalKey);
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158 }
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159
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160 /**
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161 * An integer representation of the modifier keys; <code>NO_KEY</code>
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162 * means that there is no modifier key.
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163 */
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164 private const int modifierKeys;
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165
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166 /**
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167 * The natural key for this key stroke. This value is <code>NO_KEY</code>
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168 * if the key stroke is incomplete (i.e., has no natural key).
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169 */
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170 private const int naturalKey;
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171
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172 /**
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173 * Constructs an instance of <code>KeyStroke</code> given a set of
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174 * modifier keys and a natural key.
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175 *
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176 * @param modifierKeys
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177 * the modifier keys. The format of this integer is defined by
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178 * whichever widget toolkit you are using; <code>NO_KEY</code>
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179 * always means no modifier keys.
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180 * @param naturalKey
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181 * the natural key. The format of this integer is defined by
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182 * whichever widget toolkit you are using; <code>NO_KEY</code>
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183 * always means no natural key.
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184 * @see SWTKeySupport
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185 */
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186 private this(int modifierKeys, int naturalKey) {
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187 this.modifierKeys = modifierKeys;
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188 this.naturalKey = naturalKey;
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189 }
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190
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191 /*
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192 * (non-Javadoc)
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193 *
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194 * @see java.lang.Comparable#compareTo(java.lang.Object)
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195 */
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196 public final int compareTo(Object object) {
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197 KeyStroke keyStroke = cast(KeyStroke) object;
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198 int compareTo = Util.compare(modifierKeys, keyStroke.modifierKeys);
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199
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200 if (compareTo is 0) {
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201 compareTo = Util.compare(naturalKey, keyStroke.naturalKey);
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202 }
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203
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204 return compareTo;
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205 }
35
634e4380db78 delegate compareTo from opCmp
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206 public override int opCmp( Object object ){
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207 return compareTo( object );
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208 }
12
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209
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210 /*
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211 * (non-Javadoc)
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212 *
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213 * @see java.lang.Object#equals(java.lang.Object)
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214 */
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215 public final override int opEquals(Object object) {
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216 if (!(cast(KeyStroke)object )) {
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217 return false;
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218 }
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219
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220 KeyStroke keyStroke = cast(KeyStroke) object;
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221 if (modifierKeys !is keyStroke.modifierKeys) {
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222 return false;
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223 }
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224
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225 return (naturalKey is keyStroke.naturalKey);
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226 }
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227
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228 /**
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229 * Formats this key stroke into the current default look.
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230 *
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231 * @return A string representation for this key stroke using the default
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232 * look; never <code>null</code>.
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233 */
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234 public final String format() {
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235 return KeyFormatterFactory.getDefault().format(this);
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236 }
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237
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238 /**
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239 * Returns the modifier keys for this key stroke.
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240 *
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241 * @return the bit mask of modifier keys; <code>NO_KEY</code> means that
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242 * there is no modifier key.
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243 */
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244 public final int getModifierKeys() {
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245 return modifierKeys;
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246 }
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247
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248 /**
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249 * Returns the natural key for this key stroke.
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250 *
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251 * @return The natural key for this key stroke. This value is
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252 * <code>NO_KEY</code> if the key stroke is incomplete (i.e., has
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253 * no natural key).
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254 */
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255 public final int getNaturalKey() {
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256 return naturalKey;
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257 }
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258
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259 /*
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260 * (non-Javadoc)
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261 *
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262 * @see java.lang.Object#hashCode()
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263 */
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264 public final override hash_t toHash() {
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265 return modifierKeys << 4 + naturalKey;
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266 }
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267
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268 /**
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269 * Returns whether or not this key stroke is complete. Key strokes are
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270 * complete iff they have a natural key which is not <code>NO_KEY</code>.
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271 *
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272 * @return <code>true</code>, iff the key stroke is complete.
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273 */
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274 public final bool isComplete() {
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275 return (naturalKey !is NO_KEY);
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276 }
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277
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278 /**
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279 * Returns the formal string representation for this key stroke.
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280 *
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281 * @return The formal string representation for this key stroke. Guaranteed
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282 * not to be <code>null</code>.
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283 * @see java.lang.Object#toString()
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284 */
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285 public final override String toString() {
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286 return KeyFormatterFactory.getFormalKeyFormatter().format(this);
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287 }
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288 }