1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.tagging.ac;
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3 |
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4 | import java.awt.Component;
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5 | import java.awt.event.FocusAdapter;
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6 | import java.awt.event.FocusEvent;
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7 | import java.awt.event.KeyAdapter;
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8 | import java.awt.event.KeyEvent;
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9 | import java.util.EventObject;
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10 |
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11 | import javax.swing.ComboBoxEditor;
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12 | import javax.swing.JTable;
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13 | import javax.swing.event.CellEditorListener;
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14 | import javax.swing.table.TableCellEditor;
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15 | import javax.swing.text.AttributeSet;
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16 | import javax.swing.text.BadLocationException;
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17 | import javax.swing.text.Document;
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18 | import javax.swing.text.PlainDocument;
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19 | import javax.swing.text.StyleConstants;
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20 |
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21 | import org.openstreetmap.josm.Main;
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22 | import org.openstreetmap.josm.gui.util.TableCellEditorSupport;
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23 | import org.openstreetmap.josm.gui.widgets.JosmTextField;
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24 |
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25 |
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26 | /**
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27 | * AutoCompletingTextField is an text field with autocompletion behaviour. It
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28 | * can be used as table cell editor in {@link JTable}s.
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29 | *
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30 | * Autocompletion is controlled by a list of {@link AutoCompletionListItem}s
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31 | * managed in a {@link AutoCompletionList}.
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32 | *
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33 | *
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34 | */
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35 | public class AutoCompletingTextField extends JosmTextField implements ComboBoxEditor, TableCellEditor {
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36 |
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37 | private Integer maxChars;
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38 |
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39 | /**
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40 | * The document model for the editor
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41 | */
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42 | class AutoCompletionDocument extends PlainDocument {
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43 |
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44 | /**
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45 | * inserts a string at a specific position
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46 | *
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47 | */
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48 | @Override
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49 | public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
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50 |
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51 | // If a maximum number of characters is specified, avoid to exceed it
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52 | if (maxChars != null && str != null && getLength() + str.length() > maxChars) {
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53 | int allowedLength = maxChars-getLength();
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54 | if (allowedLength > 0) {
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55 | str = str.substring(0, allowedLength);
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56 | } else {
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57 | return;
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58 | }
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59 | }
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60 |
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61 | if (autoCompletionList == null) {
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62 | super.insertString(offs, str, a);
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63 | return;
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64 | }
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65 |
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66 | // input method for non-latin characters (e.g. scim)
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67 | if (a != null && a.isDefined(StyleConstants.ComposedTextAttribute)) {
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68 | super.insertString(offs, str, a);
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69 | return;
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70 | }
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71 |
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72 | // if the current offset isn't at the end of the document we don't autocomplete.
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73 | // If a highlighted autocompleted suffix was present and we get here Swing has
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74 | // already removed it from the document. getLength() therefore doesn't include the
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75 | // autocompleted suffix.
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76 | //
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77 | if (offs < getLength()) {
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78 | super.insertString(offs, str, a);
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79 | return;
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80 | }
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81 |
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82 | String currentText = getText(0, getLength());
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83 | // if the text starts with a number we don't autocomplete
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84 | if (Main.pref.getBoolean("autocomplete.dont_complete_numbers", true)) {
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85 | try {
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86 | Long.parseLong(str);
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87 | if (currentText.length() == 0) {
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88 | // we don't autocomplete on numbers
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89 | super.insertString(offs, str, a);
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90 | return;
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91 | }
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92 | Long.parseLong(currentText);
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93 | super.insertString(offs, str, a);
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94 | return;
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95 | } catch(NumberFormatException e) {
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96 | // either the new text or the current text isn't a number. We continue with
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97 | // autocompletion
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98 | }
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99 | }
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100 | String prefix = currentText.substring(0, offs);
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101 | autoCompletionList.applyFilter(prefix+str);
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102 | if (autoCompletionList.getFilteredSize()>0) {
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103 | // there are matches. Insert the new text and highlight the
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104 | // auto completed suffix
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105 | //
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106 | String matchingString = autoCompletionList.getFilteredItem(0).getValue();
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107 | remove(0,getLength());
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108 | super.insertString(0,matchingString,a);
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109 |
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110 | // highlight from insert position to end position to put the caret at the end
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111 | setCaretPosition(offs + str.length());
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112 | moveCaretPosition(getLength());
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113 | } else {
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114 | // there are no matches. Insert the new text, do not highlight
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115 | //
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116 | String newText = prefix + str;
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117 | remove(0,getLength());
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118 | super.insertString(0,newText,a);
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119 | setCaretPosition(getLength());
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120 |
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121 | }
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122 | }
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123 | }
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124 |
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125 | /** the auto completion list user input is matched against */
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126 | protected AutoCompletionList autoCompletionList = null;
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127 |
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128 | /**
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129 | * creates the default document model for this editor
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130 | *
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131 | */
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132 | @Override
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133 | protected Document createDefaultModel() {
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134 | return new AutoCompletionDocument();
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135 | }
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136 |
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137 | protected void init() {
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138 | addFocusListener(
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139 | new FocusAdapter() {
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140 | @Override public void focusGained(FocusEvent e) {
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141 | selectAll();
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142 | applyFilter(getText());
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143 | }
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144 | }
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145 | );
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146 |
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147 | addKeyListener(
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148 | new KeyAdapter() {
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149 |
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150 | @Override
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151 | public void keyReleased(KeyEvent e) {
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152 | if (getText().equals("")) {
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153 | applyFilter("");
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154 | }
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155 | }
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156 | }
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157 | );
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158 | tableCellEditorSupport = new TableCellEditorSupport(this);
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159 | }
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160 |
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161 | /**
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162 | * constructor
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163 | */
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164 | public AutoCompletingTextField() {
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165 | init();
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166 | }
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167 |
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168 | public AutoCompletingTextField(int columns) {
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169 | super(columns);
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170 | init();
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171 | }
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172 |
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173 | protected void applyFilter(String filter) {
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174 | if (autoCompletionList != null) {
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175 | autoCompletionList.applyFilter(filter);
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176 | }
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177 | }
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178 |
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179 | /**
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180 | *
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181 | * @return the auto completion list; may be null, if no auto completion list is set
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182 | */
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183 | public AutoCompletionList getAutoCompletionList() {
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184 | return autoCompletionList;
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185 | }
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186 |
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187 | /**
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188 | * sets the auto completion list
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189 | * @param autoCompletionList the auto completion list; if null, auto completion is
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190 | * disabled
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191 | */
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192 | public void setAutoCompletionList(AutoCompletionList autoCompletionList) {
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193 | this.autoCompletionList = autoCompletionList;
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194 | }
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195 |
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196 | @Override
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197 | public Component getEditorComponent() {
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198 | return this;
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199 | }
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200 |
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201 | @Override
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202 | public Object getItem() {
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203 | return getText();
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204 | }
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205 |
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206 | @Override
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207 | public void setItem(Object anObject) {
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208 | if (anObject == null) {
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209 | setText("");
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210 | } else {
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211 | setText(anObject.toString());
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212 | }
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213 | }
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214 |
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215 | /**
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216 | * Sets the maximum number of characters allowed.
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217 | * @param max maximum number of characters allowed
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218 | * @since 5579
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219 | */
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220 | public void setMaxChars(Integer max) {
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221 | maxChars = max;
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222 | }
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223 |
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224 | /* ------------------------------------------------------------------------------------ */
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225 | /* TableCellEditor interface */
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226 | /* ------------------------------------------------------------------------------------ */
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227 |
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228 | private TableCellEditorSupport tableCellEditorSupport;
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229 | private String originalValue;
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230 |
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231 | @Override
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232 | public void addCellEditorListener(CellEditorListener l) {
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233 | tableCellEditorSupport.addCellEditorListener(l);
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234 | }
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235 |
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236 | protected void rememberOriginalValue(String value) {
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237 | this.originalValue = value;
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238 | }
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239 |
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240 | protected void restoreOriginalValue() {
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241 | setText(originalValue);
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242 | }
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243 |
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244 | @Override
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245 | public void removeCellEditorListener(CellEditorListener l) {
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246 | tableCellEditorSupport.removeCellEditorListener(l);
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247 | }
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248 | @Override
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249 | public void cancelCellEditing() {
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250 | restoreOriginalValue();
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251 | tableCellEditorSupport.fireEditingCanceled();
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252 |
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253 | }
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254 |
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255 | @Override
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256 | public Object getCellEditorValue() {
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257 | return getText();
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258 | }
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259 |
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260 | @Override
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261 | public boolean isCellEditable(EventObject anEvent) {
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262 | return true;
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263 | }
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264 |
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265 | @Override
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266 | public boolean shouldSelectCell(EventObject anEvent) {
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267 | return true;
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268 | }
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269 |
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270 | @Override
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271 | public boolean stopCellEditing() {
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272 | tableCellEditorSupport.fireEditingStopped();
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273 | return true;
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274 | }
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275 |
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276 | @Override
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277 | public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
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278 | setText( value == null ? "" : value.toString());
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279 | rememberOriginalValue(getText());
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280 | return this;
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281 | }
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282 | }
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