1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.widgets;
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3 |
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4 | import java.awt.Component;
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5 | import java.awt.Dimension;
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6 | import java.awt.Toolkit;
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7 | import java.awt.event.MouseAdapter;
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8 | import java.awt.event.MouseEvent;
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9 | import java.beans.PropertyChangeEvent;
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10 | import java.beans.PropertyChangeListener;
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11 | import java.util.ArrayList;
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12 | import java.util.Arrays;
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13 | import java.util.Collection;
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14 | import java.util.List;
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15 |
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16 | import javax.accessibility.Accessible;
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17 | import javax.swing.ComboBoxModel;
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18 | import javax.swing.DefaultComboBoxModel;
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19 | import javax.swing.JComboBox;
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20 | import javax.swing.JList;
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21 | import javax.swing.plaf.basic.ComboPopup;
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22 | import javax.swing.text.JTextComponent;
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23 |
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24 | /**
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25 | * Class overriding each {@link JComboBox} in JOSM to control consistently the number of displayed items at once.<br>
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26 | * This is needed because of the default Java behaviour that may display the top-down list off the screen (see #7917).
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27 | * @param <E> the type of the elements of this combo box
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28 | *
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29 | * @since 5429 (creation)
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30 | * @since 7015 (generics for Java 7)
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31 | */
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32 | public class JosmComboBox<E> extends JComboBox<E> {
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33 |
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34 | /**
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35 | * Creates a <code>JosmComboBox</code> with a default data model.
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36 | * The default data model is an empty list of objects.
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37 | * Use <code>addItem</code> to add items. By default the first item
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38 | * in the data model becomes selected.
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39 | *
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40 | * @see DefaultComboBoxModel
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41 | */
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42 | public JosmComboBox() {
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43 | init(null);
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44 | }
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45 |
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46 | /**
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47 | * Creates a <code>JosmComboBox</code> with a default data model and
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48 | * the specified prototype display value.
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49 | * The default data model is an empty list of objects.
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50 | * Use <code>addItem</code> to add items. By default the first item
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51 | * in the data model becomes selected.
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52 | *
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53 | * @param prototypeDisplayValue the <code>Object</code> used to compute
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54 | * the maximum number of elements to be displayed at once before
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55 | * displaying a scroll bar
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56 | *
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57 | * @see DefaultComboBoxModel
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58 | * @since 5450
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59 | */
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60 | public JosmComboBox(E prototypeDisplayValue) {
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61 | init(prototypeDisplayValue);
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62 | }
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63 |
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64 | /**
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65 | * Creates a <code>JosmComboBox</code> that takes its items from an
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66 | * existing <code>ComboBoxModel</code>. Since the
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67 | * <code>ComboBoxModel</code> is provided, a combo box created using
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68 | * this constructor does not create a default combo box model and
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69 | * may impact how the insert, remove and add methods behave.
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70 | *
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71 | * @param aModel the <code>ComboBoxModel</code> that provides the
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72 | * displayed list of items
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73 | * @see DefaultComboBoxModel
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74 | */
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75 | public JosmComboBox(ComboBoxModel<E> aModel) {
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76 | super(aModel);
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77 | List<E> list = new ArrayList<>(aModel.getSize());
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78 | for (int i = 0; i<aModel.getSize(); i++) {
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79 | list.add(aModel.getElementAt(i));
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80 | }
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81 | init(findPrototypeDisplayValue(list));
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82 | }
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83 |
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84 | /**
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85 | * Creates a <code>JosmComboBox</code> that contains the elements
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86 | * in the specified array. By default the first item in the array
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87 | * (and therefore the data model) becomes selected.
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88 | *
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89 | * @param items an array of objects to insert into the combo box
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90 | * @see DefaultComboBoxModel
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91 | */
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92 | public JosmComboBox(E[] items) {
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93 | super(items);
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94 | init(findPrototypeDisplayValue(Arrays.asList(items)));
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95 | }
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96 |
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97 | /**
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98 | * Finds the prototype display value to use among the given possible candidates.
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99 | * @param possibleValues The possible candidates that will be iterated.
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100 | * @return The value that needs the largest display height on screen.
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101 | * @since 5558
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102 | */
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103 | protected final E findPrototypeDisplayValue(Collection<E> possibleValues) {
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104 | E result = null;
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105 | int maxHeight = -1;
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106 | if (possibleValues != null) {
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107 | // Remind old prototype to restore it later
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108 | E oldPrototype = getPrototypeDisplayValue();
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109 | // Get internal JList to directly call the renderer
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110 | JList<E> list = getList();
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111 | try {
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112 | // Index to give to renderer
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113 | int i = 0;
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114 | for (E value : possibleValues) {
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115 | if (value != null) {
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116 | // With a "classic" renderer, we could call setPrototypeDisplayValue(value) + getPreferredSize()
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117 | // but not with TaggingPreset custom renderer that return a dummy height if index is equal to -1
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118 | // So we explicitely call the renderer by simulating a correct index for the current value
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119 | Component c = getRenderer().getListCellRendererComponent(list, value, i, true, true);
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120 | if (c != null) {
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121 | // Get the real preferred size for the current value
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122 | Dimension dim = c.getPreferredSize();
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123 | if (dim.height > maxHeight) {
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124 | // Larger ? This is our new prototype
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125 | maxHeight = dim.height;
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126 | result = value;
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127 | }
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128 | }
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129 | }
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130 | i++;
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131 | }
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132 | } finally {
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133 | // Restore original prototype
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134 | setPrototypeDisplayValue(oldPrototype);
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135 | }
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136 | }
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137 | return result;
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138 | }
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139 |
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140 | @SuppressWarnings("unchecked")
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141 | protected final JList<E> getList() {
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142 | for (int i = 0; i < getUI().getAccessibleChildrenCount(this); i++) {
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143 | Accessible child = getUI().getAccessibleChild(this, i);
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144 | if (child instanceof ComboPopup) {
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145 | return ((ComboPopup)child).getList();
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146 | }
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147 | }
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148 | return null;
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149 | }
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150 |
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151 | protected final void init(E prototype) {
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152 | if (prototype != null) {
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153 | setPrototypeDisplayValue(prototype);
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154 | int screenHeight = Toolkit.getDefaultToolkit().getScreenSize().height;
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155 | // Compute maximum number of visible items based on the preferred size of the combo box.
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156 | // This assumes that items have the same height as the combo box, which is not granted by the look and feel
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157 | int maxsize = (screenHeight/getPreferredSize().height) / 2;
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158 | // If possible, adjust the maximum number of items with the real height of items
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159 | // It is not granted this works on every platform (tested OK on Windows)
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160 | JList<E> list = getList();
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161 | if (list != null) {
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162 | if (!prototype.equals(list.getPrototypeCellValue())) {
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163 | list.setPrototypeCellValue(prototype);
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164 | }
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165 | int height = list.getFixedCellHeight();
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166 | if (height > 0) {
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167 | maxsize = (screenHeight/height) / 2;
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168 | }
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169 | }
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170 | setMaximumRowCount(Math.max(getMaximumRowCount(), maxsize));
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171 | }
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172 | // Handle text contextual menus for editable comboboxes
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173 | ContextMenuHandler handler = new ContextMenuHandler();
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174 | addPropertyChangeListener("editable", handler);
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175 | addPropertyChangeListener("editor", handler);
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176 | }
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177 |
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178 | protected class ContextMenuHandler extends MouseAdapter implements PropertyChangeListener {
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179 |
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180 | private JTextComponent component;
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181 | private PopupMenuLauncher launcher;
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182 |
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183 | @Override
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184 | public void propertyChange(PropertyChangeEvent evt) {
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185 | if ("editable".equals(evt.getPropertyName())) {
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186 | if (evt.getNewValue().equals(true)) {
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187 | enableMenu();
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188 | } else {
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189 | disableMenu();
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190 | }
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191 | } else if ("editor".equals(evt.getPropertyName())) {
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192 | disableMenu();
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193 | if (isEditable()) {
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194 | enableMenu();
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195 | }
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196 | }
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197 | }
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198 |
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199 | private void enableMenu() {
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200 | if (launcher == null && editor != null) {
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201 | Component editorComponent = editor.getEditorComponent();
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202 | if (editorComponent instanceof JTextComponent) {
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203 | component = (JTextComponent) editorComponent;
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204 | component.addMouseListener(this);
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205 | launcher = TextContextualPopupMenu.enableMenuFor(component, true);
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206 | }
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207 | }
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208 | }
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209 |
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210 | private void disableMenu() {
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211 | if (launcher != null) {
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212 | TextContextualPopupMenu.disableMenuFor(component, launcher);
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213 | launcher = null;
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214 | component.removeMouseListener(this);
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215 | component = null;
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216 | }
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217 | }
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218 |
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219 | @Override
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220 | public void mousePressed(MouseEvent e) {
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221 | processEvent(e);
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222 | }
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223 |
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224 | @Override
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225 | public void mouseReleased(MouseEvent e) {
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226 | processEvent(e);
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227 | }
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228 |
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229 | private void processEvent(MouseEvent e) {
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230 | if (launcher != null && !e.isPopupTrigger() && launcher.getMenu().isShowing()) {
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231 | launcher.getMenu().setVisible(false);
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232 | }
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233 | }
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234 | }
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235 |
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236 | /**
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237 | * Reinitializes this {@link JosmComboBox} to the specified values. This may needed if a custom renderer is used.
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238 | * @param values The values displayed in the combo box.
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239 | * @since 5558
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240 | */
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241 | public final void reinitialize(Collection<E> values) {
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242 | init(findPrototypeDisplayValue(values));
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243 | }
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244 | }
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