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.Toolkit;
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6 | import java.awt.datatransfer.Clipboard;
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7 | import java.awt.datatransfer.Transferable;
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8 | import java.awt.event.FocusEvent;
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9 | import java.awt.event.FocusListener;
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10 | import java.awt.im.InputContext;
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11 | import java.util.Collection;
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12 | import java.util.Locale;
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13 |
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14 | import javax.swing.ComboBoxEditor;
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15 | import javax.swing.ComboBoxModel;
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16 | import javax.swing.DefaultComboBoxModel;
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17 | import javax.swing.JLabel;
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18 | import javax.swing.JList;
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19 | import javax.swing.ListCellRenderer;
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20 | import javax.swing.text.AttributeSet;
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21 | import javax.swing.text.BadLocationException;
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22 | import javax.swing.text.JTextComponent;
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23 | import javax.swing.text.PlainDocument;
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24 | import javax.swing.text.StyleConstants;
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25 |
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26 | import org.openstreetmap.josm.Main;
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27 | import org.openstreetmap.josm.gui.widgets.JosmComboBox;
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28 |
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29 | /**
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30 | * Auto-completing ComboBox.
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31 | * @author guilhem.bonnefille@gmail.com
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32 | * @since 272
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33 | */
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34 | public class AutoCompletingComboBox extends JosmComboBox<AutoCompletionListItem> {
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35 |
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36 | private boolean autocompleteEnabled = true;
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37 |
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38 | private int maxTextLength = -1;
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39 | private boolean useFixedLocale;
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40 |
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41 | /**
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42 | * Auto-complete a JosmComboBox.
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43 | * <br>
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44 | * Inspired by <a href="http://www.orbital-computer.de/JComboBox">Thomas Bierhance example</a>.
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45 | */
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46 | class AutoCompletingComboBoxDocument extends PlainDocument {
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47 | private JosmComboBox<AutoCompletionListItem> comboBox;
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48 | private boolean selecting = false;
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49 |
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50 | /**
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51 | * Constructs a new {@code AutoCompletingComboBoxDocument}.
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52 | * @param comboBox the combobox
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53 | */
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54 | public AutoCompletingComboBoxDocument(final JosmComboBox<AutoCompletionListItem> comboBox) {
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55 | this.comboBox = comboBox;
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56 | }
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57 |
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58 | @Override
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59 | public void remove(int offs, int len) throws BadLocationException {
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60 | if (selecting)
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61 | return;
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62 | super.remove(offs, len);
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63 | }
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64 |
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65 | @Override
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66 | public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
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67 | if (selecting || (offs == 0 && str.equals(getText(0, getLength()))))
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68 | return;
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69 | if (maxTextLength > -1 && str.length()+getLength() > maxTextLength)
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70 | return;
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71 | boolean initial = offs == 0 && getLength() == 0 && str.length() > 1;
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72 | super.insertString(offs, str, a);
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73 |
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74 | // return immediately when selecting an item
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75 | // Note: this is done after calling super method because we need
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76 | // ActionListener informed
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77 | if (selecting)
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78 | return;
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79 | if (!autocompleteEnabled)
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80 | return;
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81 | // input method for non-latin characters (e.g. scim)
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82 | if (a != null && a.isDefined(StyleConstants.ComposedTextAttribute))
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83 | return;
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84 |
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85 | int size = getLength();
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86 | int start = offs+str.length();
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87 | int end = start;
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88 | String curText = getText(0, size);
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89 |
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90 | // item for lookup and selection
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91 | Object item = null;
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92 | // if the text is a number we don't autocomplete
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93 | if (Main.pref.getBoolean("autocomplete.dont_complete_numbers", true)) {
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94 | try {
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95 | Long.parseLong(str);
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96 | if (curText.length() != 0)
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97 | Long.parseLong(curText);
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98 | item = lookupItem(curText, true);
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99 | } catch (NumberFormatException e) {
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100 | // either the new text or the current text isn't a number. We continue with
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101 | // autocompletion
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102 | item = lookupItem(curText, false);
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103 | }
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104 | } else {
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105 | item = lookupItem(curText, false);
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106 | }
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107 |
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108 | setSelectedItem(item);
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109 | if (initial) {
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110 | start = 0;
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111 | }
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112 | if (item != null) {
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113 | String newText = ((AutoCompletionListItem) item).getValue();
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114 | if (!newText.equals(curText)) {
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115 | selecting = true;
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116 | super.remove(0, size);
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117 | super.insertString(0, newText, a);
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118 | selecting = false;
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119 | start = size;
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120 | end = getLength();
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121 | }
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122 | }
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123 | JTextComponent editorComponent = (JTextComponent)comboBox.getEditor().getEditorComponent();
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124 | // save unix system selection (middle mouse paste)
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125 | Clipboard sysSel = Toolkit.getDefaultToolkit().getSystemSelection();
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126 | if(sysSel != null) {
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127 | Transferable old = sysSel.getContents(null);
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128 | editorComponent.select(start, end);
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129 | sysSel.setContents(old, null);
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130 | } else {
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131 | editorComponent.select(start, end);
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132 | }
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133 | }
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134 |
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135 | private void setSelectedItem(Object item) {
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136 | selecting = true;
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137 | comboBox.setSelectedItem(item);
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138 | selecting = false;
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139 | }
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140 |
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141 | private Object lookupItem(String pattern, boolean match) {
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142 | ComboBoxModel<AutoCompletionListItem> model = comboBox.getModel();
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143 | AutoCompletionListItem bestItem = null;
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144 | for (int i = 0, n = model.getSize(); i < n; i++) {
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145 | AutoCompletionListItem currentItem = model.getElementAt(i);
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146 | if (currentItem.getValue().equals(pattern))
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147 | return currentItem;
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148 | if (!match && currentItem.getValue().startsWith(pattern)
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149 | && (bestItem == null || currentItem.getPriority().compareTo(bestItem.getPriority()) > 0)) {
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150 | bestItem = currentItem;
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151 | }
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152 | }
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153 | return bestItem; // may be null
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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 | * Creates a <code>AutoCompletingComboBox</code> with a default prototype display value.
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159 | */
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160 | public AutoCompletingComboBox() {
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161 | this("Foo");
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162 | }
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163 |
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164 | /**
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165 | * Creates a <code>AutoCompletingComboBox</code> with the specified prototype display value.
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166 | * @param prototype the <code>Object</code> used to compute the maximum number of elements to be displayed at once
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167 | * before displaying a scroll bar. It also affects the initial width of the combo box.
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168 | * @since 5520
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169 | */
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170 | public AutoCompletingComboBox(String prototype) {
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171 | super(new AutoCompletionListItem(prototype));
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172 | setRenderer(new AutoCompleteListCellRenderer());
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173 | final JTextComponent editorComponent = (JTextComponent) this.getEditor().getEditorComponent();
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174 | editorComponent.setDocument(new AutoCompletingComboBoxDocument(this));
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175 | editorComponent.addFocusListener(
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176 | new FocusListener() {
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177 | @Override
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178 | public void focusLost(FocusEvent e) {
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179 | if (Main.map != null) {
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180 | Main.map.keyDetector.setEnabled(true);
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181 | }
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182 | }
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183 | @Override
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184 | public void focusGained(FocusEvent e) {
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185 | if (Main.map != null) {
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186 | Main.map.keyDetector.setEnabled(false);
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187 | }
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188 | // save unix system selection (middle mouse paste)
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189 | Clipboard sysSel = Toolkit.getDefaultToolkit().getSystemSelection();
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190 | if(sysSel != null) {
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191 | Transferable old = sysSel.getContents(null);
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192 | editorComponent.selectAll();
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193 | sysSel.setContents(old, null);
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194 | } else {
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195 | editorComponent.selectAll();
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196 | }
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197 | }
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198 | }
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199 | );
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200 | }
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201 |
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202 | /**
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203 | * Sets the maximum text length.
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204 | * @param length the maximum text length in number of characters
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205 | */
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206 | public void setMaxTextLength(int length) {
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207 | this.maxTextLength = length;
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208 | }
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209 |
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210 | /**
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211 | * Convert the selected item into a String that can be edited in the editor component.
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212 | *
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213 | * @param cbEditor the editor
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214 | * @param item excepts AutoCompletionListItem, String and null
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215 | */
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216 | @Override
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217 | public void configureEditor(ComboBoxEditor cbEditor, Object item) {
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218 | if (item == null) {
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219 | cbEditor.setItem(null);
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220 | } else if (item instanceof String) {
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221 | cbEditor.setItem(item);
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222 | } else if (item instanceof AutoCompletionListItem) {
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223 | cbEditor.setItem(((AutoCompletionListItem)item).getValue());
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224 | } else
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225 | throw new IllegalArgumentException("Unsupported item: "+item);
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226 | }
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227 |
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228 | /**
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229 | * Selects a given item in the ComboBox model
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230 | * @param item excepts AutoCompletionListItem, String and null
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231 | */
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232 | @Override
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233 | public void setSelectedItem(Object item) {
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234 | if (item == null) {
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235 | super.setSelectedItem(null);
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236 | } else if (item instanceof AutoCompletionListItem) {
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237 | super.setSelectedItem(item);
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238 | } else if (item instanceof String) {
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239 | String s = (String) item;
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240 | // find the string in the model or create a new item
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241 | for (int i=0; i< getModel().getSize(); i++) {
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242 | AutoCompletionListItem acItem = getModel().getElementAt(i);
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243 | if (s.equals(acItem.getValue())) {
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244 | super.setSelectedItem(acItem);
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245 | return;
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246 | }
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247 | }
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248 | super.setSelectedItem(new AutoCompletionListItem(s, AutoCompletionItemPriority.UNKNOWN));
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249 | } else {
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250 | throw new IllegalArgumentException("Unsupported item: "+item);
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251 | }
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252 | }
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253 |
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254 | /**
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255 | * Sets the items of the combobox to the given {@code String}s.
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256 | * @param elems String items
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257 | */
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258 | public void setPossibleItems(Collection<String> elems) {
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259 | DefaultComboBoxModel<AutoCompletionListItem> model = (DefaultComboBoxModel<AutoCompletionListItem>)this.getModel();
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260 | Object oldValue = this.getEditor().getItem(); // Do not use getSelectedItem(); (fix #8013)
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261 | model.removeAllElements();
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262 | for (String elem : elems) {
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263 | model.addElement(new AutoCompletionListItem(elem, AutoCompletionItemPriority.UNKNOWN));
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264 | }
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265 | // disable autocomplete to prevent unnecessary actions in AutoCompletingComboBoxDocument#insertString
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266 | autocompleteEnabled = false;
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267 | this.getEditor().setItem(oldValue); // Do not use setSelectedItem(oldValue); (fix #8013)
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268 | autocompleteEnabled = true;
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269 | }
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270 |
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271 | /**
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272 | * Sets the items of the combobox to the given {@code AutoCompletionListItem}s.
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273 | * @param elems AutoCompletionListItem items
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274 | */
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275 | public void setPossibleACItems(Collection<AutoCompletionListItem> elems) {
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276 | DefaultComboBoxModel<AutoCompletionListItem> model = (DefaultComboBoxModel<AutoCompletionListItem>)this.getModel();
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277 | Object oldValue = getSelectedItem();
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278 | Object editorOldValue = this.getEditor().getItem();
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279 | model.removeAllElements();
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280 | for (AutoCompletionListItem elem : elems) {
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281 | model.addElement(elem);
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282 | }
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283 | setSelectedItem(oldValue);
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284 | this.getEditor().setItem(editorOldValue);
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285 | }
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286 |
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287 | /**
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288 | * Determines if autocompletion is enabled.
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289 | * @return {@code true} if autocompletion is enabled, {@code false} otherwise.
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290 | */
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291 | public final boolean isAutocompleteEnabled() {
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292 | return autocompleteEnabled;
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293 | }
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294 |
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295 | protected void setAutocompleteEnabled(boolean autocompleteEnabled) {
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296 | this.autocompleteEnabled = autocompleteEnabled;
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297 | }
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298 |
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299 | /**
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300 | * If the locale is fixed, English keyboard layout will be used by default for this combobox
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301 | * all other components can still have different keyboard layout selected
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302 | * @param f fixed locale
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303 | */
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304 | public void setFixedLocale(boolean f) {
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305 | useFixedLocale = f;
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306 | if (useFixedLocale) {
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307 | privateInputContext.selectInputMethod(new Locale("en", "US"));
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308 | }
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309 | }
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310 |
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311 | private static InputContext privateInputContext = InputContext.getInstance();
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312 |
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313 | @Override
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314 | public InputContext getInputContext() {
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315 | if (useFixedLocale) {
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316 | return privateInputContext;
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317 | }
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318 | return super.getInputContext();
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319 | }
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320 |
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321 | /**
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322 | * ListCellRenderer for AutoCompletingComboBox
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323 | * renders an AutoCompletionListItem by showing only the string value part
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324 | */
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325 | public static class AutoCompleteListCellRenderer extends JLabel implements ListCellRenderer<AutoCompletionListItem> {
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326 |
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327 | /**
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328 | * Constructs a new {@code AutoCompleteListCellRenderer}.
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329 | */
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330 | public AutoCompleteListCellRenderer() {
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331 | setOpaque(true);
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332 | }
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333 |
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334 | @Override
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335 | public Component getListCellRendererComponent(
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336 | JList<? extends AutoCompletionListItem> list,
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337 | AutoCompletionListItem item,
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338 | int index,
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339 | boolean isSelected,
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340 | boolean cellHasFocus) {
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341 | if (isSelected) {
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342 | setBackground(list.getSelectionBackground());
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343 | setForeground(list.getSelectionForeground());
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344 | } else {
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345 | setBackground(list.getBackground());
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346 | setForeground(list.getForeground());
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347 | }
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348 |
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349 | setText(item.getValue());
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350 | return this;
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351 | }
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352 | }
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353 | }
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