1 | |
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2 | package de.ugoe.cs.quest.eventcore.gui; |
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3 | |
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4 | import java.util.HashSet; |
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5 | import java.util.LinkedList; |
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6 | import java.util.List; |
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7 | import java.util.ListIterator; |
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8 | import java.util.Set; |
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9 | import java.util.logging.Level; |
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10 | |
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11 | import de.ugoe.cs.quest.eventcore.Event; |
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12 | import de.ugoe.cs.tasktree.keyboardmaps.VirtualKey; |
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13 | import de.ugoe.cs.util.console.Console; |
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14 | |
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15 | /** |
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16 | * <p> |
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17 | * This class provides the functionality to sort and clean up all key interactions in a log. In |
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18 | * particular: |
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19 | * <ol> |
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20 | * <li>In case a combination key (e.g., shift, alt, control) is held down, multiple |
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21 | * {@link KeyPressed} events are logged, even though only the first one is of importance. This class |
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22 | * removes all {@link KeyPressed} events for combination keys except the first.</li> |
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23 | * <li>In case a normal key is held down, multiple {@link KeyPressed} events are logged, but there |
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24 | * is only one {@link KeyReleased} event. This class adds a {@link KeyReleased} event for all such |
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25 | * {@link KeyPressed} events.</li> |
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26 | * <li>Due to message filtering of applications, it is possible that a {@link KeyReleased} event |
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27 | * without a preceding {@link KeyPressed} event is logged. This class either adds the missing |
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28 | * {@link KeyPressed} right in front of the {@link KeyReleased} or removes the {@link KeyReleased} |
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29 | * depending on the {@link #mode}. |
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30 | * <li>As a result of steps 2-3, we have always a matching {@link KeyPressed}/{@link KeyReleased} |
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31 | * pairs for all normal keys. This class replaces these pairs with a {@link KeyTyped} event at the |
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32 | * position of the {@link KeyPressed} event.</li> |
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33 | * <li>Sometimes combination keys are not released in the same order they have been pressed. This |
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34 | * class ensures that the {@link KeyReleased} are in the opposite order of the {@link KeyPressed} |
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35 | * events for all combination keys.</li> |
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36 | * </ol> |
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37 | * </p> |
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38 | * |
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39 | * @version 1.0 |
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40 | * @author Steffen Herbold |
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41 | */ |
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42 | public class KeyInteractionSorter { |
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43 | |
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44 | /** |
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45 | * <p> |
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46 | * Describes the clean-up mode. |
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47 | * </p> |
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48 | * |
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49 | * @version 1.0 |
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50 | * @author Steffen Herbold |
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51 | */ |
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52 | public static enum CleanupMode { |
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53 | /** |
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54 | * <p> |
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55 | * Single {@link KeyReleased} are removed from the sequence. |
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56 | * </p> |
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57 | */ |
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58 | REMOVAL, |
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59 | |
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60 | /** |
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61 | * <p> |
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62 | * {@link KeyPressed} events are added to single {@link KeyReleased} events |
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63 | * </p> |
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64 | */ |
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65 | ADDITION |
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66 | }; |
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67 | |
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68 | /** |
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69 | * <p> |
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70 | * |
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71 | * </p> |
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72 | */ |
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73 | private final CleanupMode mode; |
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74 | |
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75 | /** |
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76 | * <p> |
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77 | * Constructor. Creates a new {@link KeyInteractionSorter} with {@link #mode}= |
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78 | * {@link CleanupMode#ADDITION}. |
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79 | * </p> |
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80 | */ |
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81 | public KeyInteractionSorter() { |
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82 | this(CleanupMode.ADDITION); |
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83 | } |
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84 | |
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85 | /** |
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86 | * <p> |
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87 | * Constructor. Creates a new {@link KeyInteractionSorter}. |
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88 | * </p> |
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89 | * |
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90 | * @param mode |
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91 | * {@link #mode} of the instance |
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92 | */ |
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93 | public KeyInteractionSorter(CleanupMode mode) { |
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94 | this.mode = mode; |
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95 | } |
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96 | |
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97 | /** |
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98 | * <p> |
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99 | * Sorts and cleans up key interactions according to the class specification (@see |
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100 | * {@link KeyInteractionSorter} class comment). |
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101 | * </p> |
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102 | * <p> |
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103 | * This method returns a sorted copy of a sequence, the sequence itself is not changed. |
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104 | * </p> |
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105 | * |
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106 | * @param sequence |
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107 | * sequence which is sorted |
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108 | * @return sorted copy of sequence |
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109 | */ |
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110 | public List<Event> sortKeyInteractions(final List<Event> sequence) { |
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111 | List<Event> sortedSequence = new LinkedList<Event>(sequence); |
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112 | |
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113 | handleIncompleteKeyPairs(sortedSequence); |
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114 | sortCombinationKeyPairs(sortedSequence); |
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115 | |
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116 | return sortedSequence; |
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117 | } |
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118 | |
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119 | /** |
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120 | * <p> |
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121 | * Performs tasks 1-4 defined in the class description. Operations are performed in-place on the |
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122 | * passed sequence. |
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123 | * </p> |
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124 | * |
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125 | * @param sequence |
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126 | * sequence which is sorted |
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127 | */ |
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128 | private void sortCombinationKeyPairs(List<Event> sequence) { |
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129 | LinkedList<VirtualKey> pressedCombinationKeys = new LinkedList<VirtualKey>(); |
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130 | |
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131 | for (int i = 0; i < sequence.size(); i++) { |
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132 | Event event = sequence.get(i); |
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133 | if (event.getType() instanceof KeyPressed) { |
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134 | final VirtualKey key = ((KeyPressed) event.getType()).getKey(); |
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135 | if (key.isCombinationKey()) { |
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136 | pressedCombinationKeys.add(key); |
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137 | } |
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138 | } |
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139 | if (event.getType() instanceof KeyReleased) { |
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140 | final VirtualKey key = ((KeyReleased) event.getType()).getKey(); |
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141 | if (key.isCombinationKey()) { |
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142 | /* |
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143 | * if( pressedCombinationKeys.isEmpty() ) { Console.traceln(Level.INFO, "" + i); |
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144 | * for( int j=i-30 ; j<=i ; j++ ) { Console.traceln(Level.INFO, |
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145 | * sequence.get(i).toString()); } } |
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146 | */ |
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147 | if (key.equals(pressedCombinationKeys.getLast())) { |
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148 | pressedCombinationKeys.removeLast(); |
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149 | } |
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150 | else { |
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151 | // look-ahead to find new position |
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152 | int offset; |
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153 | for (offset = 1; offset + i < sequence.size(); offset++) { |
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154 | Event lookaheadEvent = sequence.get(i + offset); |
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155 | if (lookaheadEvent.getType() instanceof KeyReleased) { |
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156 | if (((KeyReleased) lookaheadEvent.getType()).getKey() |
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157 | .equals(pressedCombinationKeys.getLast())) |
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158 | { |
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159 | break; |
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160 | } |
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161 | } |
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162 | } |
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163 | sequence.add(i + offset + 1, event); |
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164 | sequence.remove(i); |
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165 | i--; |
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166 | } |
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167 | } |
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168 | } |
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169 | } |
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170 | } |
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171 | |
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172 | /** |
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173 | * <p> |
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174 | * Performs task 5 defined in the class description. Operations are performed in-place on the |
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175 | * passed sequence. |
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176 | * </p> |
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177 | * |
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178 | * @param sequence |
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179 | * sequence which is sorted |
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180 | */ |
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181 | private void handleIncompleteKeyPairs(List<Event> sequence) { |
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182 | Set<VirtualKey> pressedKeys = new HashSet<VirtualKey>(); |
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183 | int firstPressedIndex = -1; |
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184 | |
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185 | Set<VirtualKey> pressedCombinationKeysSession = new HashSet<VirtualKey>(); |
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186 | |
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187 | for (int i = 0; i < sequence.size(); i++) { |
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188 | Event event = sequence.get(i); |
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189 | if (event.getType() instanceof KeyboardFocusChange) { |
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190 | if (firstPressedIndex != -1) { |
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191 | sequence.remove(i); |
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192 | sequence.add(firstPressedIndex, event); |
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193 | } |
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194 | } |
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195 | |
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196 | if (event.getType() instanceof KeyPressed) { |
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197 | if (pressedKeys.isEmpty()) { |
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198 | firstPressedIndex = i; |
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199 | } |
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200 | VirtualKey key = ((KeyPressed) event.getType()).getKey(); |
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201 | if (!key.isCombinationKey()) { |
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202 | ListIterator<Event> iter = sequence.listIterator(i); |
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203 | iter.next(); |
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204 | iter.set(new Event(new KeyTyped(key), event.getTarget())); |
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205 | } |
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206 | else { |
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207 | pressedCombinationKeysSession.add(key); |
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208 | if (pressedKeys.contains(key)) { |
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209 | sequence.remove(i); |
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210 | i--; |
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211 | } |
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212 | } |
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213 | pressedKeys.add(key); |
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214 | } |
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215 | if (event.getType() instanceof KeyReleased) { |
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216 | VirtualKey key = ((KeyReleased) event.getType()).getKey(); |
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217 | if (!key.isCombinationKey()) { |
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218 | if (pressedKeys.contains(key)) { |
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219 | sequence.remove(i); |
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220 | i--; |
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221 | } |
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222 | else { |
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223 | // found KeyReleased event without KeyPressed |
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224 | switch (mode) |
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225 | { |
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226 | case REMOVAL: |
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227 | sequence.remove(i); |
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228 | i--; |
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229 | break; |
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230 | case ADDITION: |
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231 | ListIterator<Event> iter = sequence.listIterator(i); |
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232 | iter.next(); |
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233 | iter.set(new Event(new KeyTyped(key), event.getTarget())); |
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234 | break; |
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235 | default: |
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236 | throw new AssertionError( |
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237 | "reached source code that should be unreachable"); |
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238 | } |
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239 | } |
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240 | } |
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241 | else { |
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242 | if (!pressedKeys.contains(key)) { |
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243 | if (pressedCombinationKeysSession.contains(key)) { |
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244 | Console.traceln(Level.SEVERE, "Found a " + key + |
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245 | " KeyReleased event without a KeyPressed event." + |
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246 | "The event will be dropped and the session is possibly faulty."); |
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247 | sequence.remove(i); |
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248 | i--; |
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249 | } |
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250 | else { |
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251 | Console |
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252 | .traceln(Level.SEVERE, |
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253 | "Found a " + |
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254 | key + |
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255 | " KeyReleased event without a KeyPressed event." + |
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256 | "Since no KeyPressed of key " + |
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257 | key + |
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258 | " has been part of the session " + |
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259 | "till now, we assume that the key has been pressed since the beginning " + |
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260 | "of the session and add a KeyPressed event for " + |
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261 | key + " to the start " + "of the session."); |
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262 | sequence.add(0, new Event(new KeyPressed(key), event.getTarget())); |
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263 | i++; |
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264 | } |
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265 | } |
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266 | } |
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267 | pressedKeys.remove(key); |
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268 | if (pressedKeys.isEmpty()) { |
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269 | firstPressedIndex = -1; |
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270 | } |
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271 | } |
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272 | } |
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273 | if (!pressedKeys.isEmpty()) { |
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274 | Console |
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275 | .traceln(Level.WARNING, |
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276 | "There was probably a failure during the handling of incomplete key event pairs."); |
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277 | } |
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278 | } |
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279 | } |
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