1 | package de.ugoe.cs.quest.eventcore.gui; |
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2 | |
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3 | import java.util.ArrayList; |
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4 | import java.util.LinkedList; |
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5 | import java.util.List; |
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6 | import java.util.Locale; |
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7 | |
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8 | import de.ugoe.cs.quest.eventcore.Event; |
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9 | import de.ugoe.cs.quest.eventcore.IEventTarget; |
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10 | import de.ugoe.cs.quest.eventcore.gui.KeyInteraction; |
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11 | import de.ugoe.cs.quest.eventcore.gui.KeyPressed; |
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12 | import de.ugoe.cs.quest.eventcore.gui.KeyReleased; |
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13 | import de.ugoe.cs.quest.eventcore.guimodel.ITextArea; |
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14 | import de.ugoe.cs.quest.eventcore.guimodel.ITextField; |
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15 | import de.ugoe.cs.tasktree.keyboardmaps.KeyboardMap; |
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16 | import de.ugoe.cs.tasktree.keyboardmaps.KeyboardMapFactory; |
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17 | import de.ugoe.cs.tasktree.keyboardmaps.VirtualKey; |
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18 | |
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19 | /** |
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20 | * <p> |
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21 | * The text input detector iterates a list of events and searches for subsequent key events. |
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22 | * Those are replaced by a single text input event representing the text entered through the key |
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23 | * events. The replacement is only done, if the key events have a text field or text area as target |
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24 | * </p> |
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25 | * |
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26 | * @version $Revision: $ $Date: 18.03.2012$ |
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27 | * @author 2012, last modified by $Author: patrick$ |
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28 | */ |
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29 | public class TextInputDetector { |
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30 | |
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31 | /** the keyboard map to use for character recognition*/ |
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32 | private KeyboardMap keyboardMap = KeyboardMapFactory.createKeyboardMap(Locale.GERMAN); |
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33 | |
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34 | /** the keys pressed in parallel */ |
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35 | List<VirtualKey> pressedKeys = new ArrayList<VirtualKey>(); |
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36 | |
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37 | /** |
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38 | * <p> |
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39 | * in the provided list of events, this method detects any event sequences that consists of |
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40 | * key interactions and replaces them with a single text input interaction. This contains |
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41 | * the entered text as well as the replaced key interaction events |
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42 | * </p> |
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43 | * |
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44 | * @param sequence the event sequence to search for text input events |
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45 | * |
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46 | * @return the resulting sequence, in which key interactions on text fields and areas are |
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47 | * reduced to text input interactions |
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48 | */ |
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49 | public List<Event> detectTextInputs(List<Event> sequence) |
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50 | { |
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51 | List<Event> resultingSequence = new LinkedList<Event>(); |
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52 | |
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53 | int textEntryStartIndex = -1; |
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54 | IEventTarget lastEventTarget = null; |
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55 | |
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56 | int index = 0; |
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57 | Event currentEvent = null; |
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58 | Event textInputEvent = null; |
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59 | while (index < sequence.size()) { |
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60 | currentEvent = sequence.get(index); |
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61 | textInputEvent = null; |
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62 | |
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63 | if (isKeyInteraction(currentEvent) && isDataInputEventTarget(currentEvent.getTarget())) |
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64 | { |
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65 | if (textEntryStartIndex < 0) { |
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66 | textEntryStartIndex = index; |
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67 | lastEventTarget = currentEvent.getTarget(); |
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68 | } |
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69 | else if (!lastEventTarget.equals(currentEvent.getTarget())) { |
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70 | textInputEvent = handleTextEntrySequence |
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71 | (sequence, textEntryStartIndex, index - 1, lastEventTarget); |
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72 | |
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73 | textEntryStartIndex = index; |
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74 | lastEventTarget = currentEvent.getTarget(); |
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75 | } |
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76 | currentEvent = null; |
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77 | } |
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78 | else { |
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79 | if (textEntryStartIndex >= 0) { |
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80 | textInputEvent = handleTextEntrySequence |
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81 | (sequence, textEntryStartIndex, index - 1, lastEventTarget); |
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82 | |
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83 | textEntryStartIndex = -1; |
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84 | lastEventTarget = null; |
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85 | } |
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86 | |
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87 | } |
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88 | |
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89 | if (textInputEvent != null) { |
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90 | resultingSequence.add(textInputEvent); |
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91 | } |
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92 | |
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93 | if (currentEvent != null) { |
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94 | resultingSequence.add(currentEvent); |
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95 | } |
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96 | |
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97 | index++; |
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98 | } |
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99 | |
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100 | if (textEntryStartIndex >= 0) { |
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101 | textInputEvent = handleTextEntrySequence |
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102 | (sequence, textEntryStartIndex, sequence.size() - 1, lastEventTarget); |
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103 | |
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104 | if (textInputEvent != null) { |
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105 | resultingSequence.add(textInputEvent); |
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106 | } |
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107 | } |
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108 | |
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109 | return resultingSequence; |
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110 | } |
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111 | |
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112 | /** |
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113 | * <p> |
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114 | * returns true if the provide event is a key interaction; false else |
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115 | * </p> |
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116 | * |
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117 | * @param event the even to check |
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118 | * |
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119 | * @return as described |
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120 | */ |
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121 | private boolean isKeyInteraction(Event event) { |
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122 | return (event.getType() instanceof KeyInteraction); |
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123 | } |
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124 | |
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125 | /** |
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126 | * <p> |
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127 | * creates a single text input event as replacement for key interactions being part of the |
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128 | * subsequence of events denoted by the start and end index in the provide event sequence. If |
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129 | * no text was entered, because the subsequence only contained key released events, then no |
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130 | * text input event is generated (the method returns null). |
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131 | * </p> |
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132 | * |
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133 | * @param sequence |
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134 | * the event sequence of which the subsequence is analyzed |
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135 | * @param startIndex |
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136 | * the start index in the event sequence from which the analysis should start |
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137 | * (inclusive) |
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138 | * @param endIndex |
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139 | * the end index in the event sequence where the analysis should end (inclusive) |
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140 | * @param eventTarget |
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141 | * the event target to be used for the new event |
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142 | * |
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143 | * @return a text input event representing the text input resulting from the events of |
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144 | * the provided subsequence |
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145 | * |
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146 | * @throws IllegalArgumentException |
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147 | * if the denoted subsequence contains other events than key interactions |
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148 | */ |
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149 | private Event handleTextEntrySequence(List<Event> sequence, |
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150 | int startIndex, |
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151 | int endIndex, |
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152 | IEventTarget eventTarget) |
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153 | { |
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154 | List<Event> textInputEvents = new ArrayList<Event>(); |
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155 | |
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156 | String enteredText = determineEnteredText(sequence, startIndex, endIndex, textInputEvents); |
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157 | |
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158 | if ((enteredText != null) && (!"".equals(enteredText))) { |
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159 | TextInput textInput = new TextInput(enteredText, textInputEvents); |
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160 | return new Event(textInput, eventTarget); |
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161 | } |
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162 | else { |
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163 | return null; |
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164 | } |
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165 | } |
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166 | |
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167 | /** |
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168 | * <p> |
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169 | * check if an event target is a data input field, i.e. a text field or a text area |
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170 | * </p> |
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171 | * |
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172 | * @param eventTarget the event target to check |
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173 | * |
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174 | * @return true, if it is a text field or a text area ; false else |
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175 | */ |
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176 | private boolean isDataInputEventTarget(IEventTarget eventTarget) { |
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177 | return ((eventTarget instanceof ITextField) || (eventTarget instanceof ITextArea)); |
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178 | } |
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179 | |
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180 | /** |
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181 | * <p> |
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182 | * determines the text entered in the event subsequence denoted by the start and end index of |
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183 | * the provided event sequence. The method records any pressed and released key interaction as |
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184 | * well as combinations of pressed key interactions (such as shift + letter) and determines the |
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185 | * respective character. All identified characters are then combined to the entered text. The |
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186 | * method also identifies the usage of the back space. The enter key is ignored for text fields |
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187 | * in which pressing the enter key results in finishing the text entry. All analyzed key |
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188 | * interaction events are stored in the provided text input events result list. If the |
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189 | * subsequence only contains key released events, no text was entered and the returned text is |
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190 | * null. |
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191 | * </p> |
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192 | * |
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193 | * @param sequence |
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194 | * the event sequence of which the subsequence is analyzed |
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195 | * @param startIndex |
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196 | * the start index in the event sequence from which the analysis should start |
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197 | * (inclusive) |
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198 | * @param endIndex |
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199 | * the end index in the event sequence where the analysis should end (inclusive) |
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200 | * @param textInputEvents |
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201 | * a buffer to contain any key interaction event analyzed (in out) |
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202 | * |
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203 | * @return the text entered through the interaction events of the denoted subsequence |
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204 | * |
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205 | * @throws IllegalArgumentException |
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206 | * if the denoted sequence contains other events than key interactions |
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207 | */ |
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208 | private String determineEnteredText(List<Event> sequence, |
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209 | int startIndex, |
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210 | int endIndex, |
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211 | List<Event> textInputEvents) |
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212 | throws IllegalArgumentException |
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213 | { |
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214 | Event event; |
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215 | StringBuffer enteredText = new StringBuffer(); |
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216 | |
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217 | for (int i = startIndex; i <= endIndex; i++) { |
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218 | event = sequence.get(i); |
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219 | |
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220 | if (event.getType() instanceof KeyPressed) { |
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221 | VirtualKey key = ((KeyPressed) event.getType()).getKey(); |
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222 | |
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223 | pressedKeys.add(key); |
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224 | |
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225 | if (key == VirtualKey.BACK_SPACE) { |
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226 | if (enteredText.length() > 0) { |
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227 | enteredText.deleteCharAt(enteredText.length() - 1); |
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228 | } |
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229 | } |
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230 | else if (key == VirtualKey.ENTER) { |
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231 | // text fields only contain one line of code. Therefore the return is ignored. |
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232 | if (!(event.getTarget() instanceof ITextField)) { |
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233 | enteredText.append(getCharacter(key, pressedKeys)); |
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234 | } |
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235 | } |
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236 | else { |
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237 | char theChar = getCharacter(key, pressedKeys); |
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238 | if (theChar != Character.UNASSIGNED) { |
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239 | enteredText.append(theChar); |
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240 | } |
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241 | } |
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242 | } |
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243 | else if (event.getType() instanceof KeyReleased) { |
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244 | pressedKeys.remove(((KeyReleased) event.getType()).getKey()); |
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245 | } |
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246 | else { |
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247 | throw new IllegalArgumentException |
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248 | ("the subsequence denoted by the indexes contains other interactions than " + |
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249 | "just key strokes"); |
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250 | } |
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251 | |
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252 | textInputEvents.add(event); |
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253 | } |
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254 | |
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255 | if (enteredText.length() > 0) { |
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256 | return enteredText.toString(); |
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257 | } |
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258 | else { |
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259 | return null; |
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260 | } |
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261 | } |
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262 | |
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263 | /** |
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264 | * <p> |
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265 | * determines the character matching the pressed key depending on other keys pressed in parallel |
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266 | * such as the shift key. |
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267 | * </p> |
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268 | * |
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269 | * @param key the key for which the character shall be determined |
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270 | * @param pressedKeys the list of other keys pressed in parallel |
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271 | * |
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272 | * @return the character resulting from the combination of pressed keys |
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273 | */ |
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274 | private char getCharacter(VirtualKey key, List<VirtualKey> pressedKeys) { |
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275 | boolean numlock = false; |
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276 | boolean shift = false; |
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277 | boolean altgr = false; |
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278 | |
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279 | for (VirtualKey pressedKey : pressedKeys) { |
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280 | if (pressedKey.isShiftKey()) { |
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281 | shift = !shift; |
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282 | } |
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283 | else if (pressedKey == VirtualKey.ALT_GRAPH) { |
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284 | altgr = !altgr; |
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285 | } |
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286 | else if (pressedKey == VirtualKey.NUM_LOCK) { |
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287 | numlock = !numlock; |
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288 | } |
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289 | } |
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290 | |
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291 | return keyboardMap.getCharacterFor(key, numlock, shift, altgr, false); |
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292 | } |
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293 | |
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294 | } |
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