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.Vector;
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15 |
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16 | import javax.accessibility.Accessible;
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17 | import javax.swing.ComboBoxEditor;
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18 | import javax.swing.ComboBoxModel;
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19 | import javax.swing.DefaultComboBoxModel;
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20 | import javax.swing.JComboBox;
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21 | import javax.swing.JList;
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22 | import javax.swing.plaf.basic.ComboPopup;
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23 | import javax.swing.text.JTextComponent;
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24 |
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25 | /**
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26 | * Class overriding each {@link JComboBox} in JOSM to control consistently the number of displayed items at once.<br/>
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27 | * 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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28 | *
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29 | * @since 5429
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30 | */
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31 | public class JosmComboBox extends JComboBox {
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32 |
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33 | /**
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34 | * The default prototype value used to compute the maximum number of elements to be displayed at once before
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35 | * displaying a scroll bar
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36 | */
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37 | public static final String DEFAULT_PROTOTYPE_DISPLAY_VALUE = "Prototype display value";
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38 |
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39 | /**
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40 | * Creates a <code>JosmComboBox</code> with a default data model.
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41 | * The default data model is an empty list of objects.
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42 | * Use <code>addItem</code> to add items. By default the first item
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43 | * in the data model becomes selected.
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44 | *
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45 | * @see DefaultComboBoxModel
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46 | */
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47 | public JosmComboBox() {
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48 | this(DEFAULT_PROTOTYPE_DISPLAY_VALUE);
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49 | }
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50 |
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51 | /**
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52 | * Creates a <code>JosmComboBox</code> with a default data model and
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53 | * the specified prototype display value.
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54 | * The default data model is an empty list of objects.
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55 | * Use <code>addItem</code> to add items. By default the first item
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56 | * in the data model becomes selected.
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57 | *
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58 | * @param prototypeDisplayValue the <code>Object</code> used to compute
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59 | * the maximum number of elements to be displayed at once before
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60 | * displaying a scroll bar
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61 | *
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62 | * @see DefaultComboBoxModel
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63 | * @since 5450
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64 | */
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65 | public JosmComboBox(Object prototypeDisplayValue) {
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66 | super();
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67 | init(prototypeDisplayValue);
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68 | }
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69 |
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70 | /**
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71 | * Creates a <code>JosmComboBox</code> that takes its items from an
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72 | * existing <code>ComboBoxModel</code>. Since the
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73 | * <code>ComboBoxModel</code> is provided, a combo box created using
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74 | * this constructor does not create a default combo box model and
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75 | * may impact how the insert, remove and add methods behave.
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76 | *
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77 | * @param aModel the <code>ComboBoxModel</code> that provides the
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78 | * displayed list of items
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79 | * @see DefaultComboBoxModel
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80 | */
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81 | public JosmComboBox(ComboBoxModel aModel) {
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82 | super(aModel);
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83 | ArrayList<Object> list = new ArrayList<Object>(aModel.getSize());
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84 | for (int i = 0; i<aModel.getSize(); i++) {
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85 | list.add(aModel.getElementAt(i));
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86 | }
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87 | init(findPrototypeDisplayValue(list));
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88 | }
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89 |
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90 | /**
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91 | * Creates a <code>JosmComboBox</code> that contains the elements
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92 | * in the specified array. By default the first item in the array
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93 | * (and therefore the data model) becomes selected.
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94 | *
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95 | * @param items an array of objects to insert into the combo box
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96 | * @see DefaultComboBoxModel
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97 | */
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98 | public JosmComboBox(Object[] items) {
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99 | super(items);
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100 | init(findPrototypeDisplayValue(Arrays.asList(items)));
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101 | }
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102 |
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103 | /**
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104 | * Creates a <code>JosmComboBox</code> that contains the elements
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105 | * in the specified Vector. By default the first item in the vector
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106 | * (and therefore the data model) becomes selected.
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107 | *
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108 | * @param items an array of vectors to insert into the combo box
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109 | * @see DefaultComboBoxModel
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110 | */
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111 | public JosmComboBox(Vector<?> items) {
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112 | super(items);
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113 | init(findPrototypeDisplayValue(items));
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114 | }
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115 |
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116 | /**
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117 | * Finds the prototype display value to use among the given possible candidates.
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118 | * @param possibleValues The possible candidates that will be iterated.
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119 | * @return The value that needs the largest display height on screen.
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120 | * @since 5558
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121 | */
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122 | protected Object findPrototypeDisplayValue(Collection<?> possibleValues) {
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123 | Object result = null;
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124 | int maxHeight = -1;
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125 | if (possibleValues != null) {
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126 | // Remind old prototype to restore it later
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127 | Object oldPrototype = getPrototypeDisplayValue();
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128 | // Get internal JList to directly call the renderer
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129 | JList list = getList();
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130 | try {
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131 | // Index to give to renderer
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132 | int i = 0;
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133 | for (Object value : possibleValues) {
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134 | if (value != null) {
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135 | // These two lines work with a "classic" renderer,
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136 | // but not with TaggingPreset custom renderer that return a dummy height if index is equal to -1
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137 | //setPrototypeDisplayValue(value);
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138 | //Dimension dim = getPreferredSize();
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139 |
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140 | // So we explicitely call the renderer by simulating a correct index for the current value
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141 | Component c = getRenderer().getListCellRendererComponent(list, value, i, true, true);
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142 | if (c != null) {
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143 | // Get the real preferred size for the current value
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144 | Dimension dim = c.getPreferredSize();
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145 | if (dim.height > maxHeight) {
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146 | // Larger ? This is our new prototype
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147 | maxHeight = dim.height;
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148 | result = value;
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149 | }
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150 | }
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151 | }
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152 | i++;
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153 | }
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154 | } finally {
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155 | // Restore original prototype
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156 | setPrototypeDisplayValue(oldPrototype);
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157 | }
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158 | }
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159 | return result;
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160 | }
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161 |
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162 | protected final JList getList() {
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163 | for (int i = 0; i < getUI().getAccessibleChildrenCount(this); i++) {
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164 | Accessible child = getUI().getAccessibleChild(this, i);
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165 | if (child instanceof ComboPopup) {
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166 | return ((ComboPopup)child).getList();
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167 | }
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168 | }
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169 | return null;
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170 | }
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171 |
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172 | protected void init(Object prototype) {
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173 | if (prototype != null) {
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174 | setPrototypeDisplayValue(prototype);
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175 | int screenHeight = Toolkit.getDefaultToolkit().getScreenSize().height;
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176 | // Compute maximum number of visible items based on the preferred size of the combo box.
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177 | // 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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178 | int maxsize = (screenHeight/getPreferredSize().height) / 2;
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179 | // If possible, adjust the maximum number of items with the real height of items
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180 | // It is not granted this works on every platform (tested OK on Windows)
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181 | JList list = getList();
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182 | if (list != null) {
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183 | if (list.getPrototypeCellValue() != prototype) {
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184 | list.setPrototypeCellValue(prototype);
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185 | }
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186 | int height = list.getFixedCellHeight();
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187 | if (height > 0) {
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188 | maxsize = (screenHeight/height) / 2;
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189 | }
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190 | }
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191 | setMaximumRowCount(Math.max(getMaximumRowCount(), maxsize));
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192 | }
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193 | // Handle text contextual menus for editable comboboxes
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194 | ContextMenuHandler handler = new ContextMenuHandler();
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195 | addPropertyChangeListener("editable", handler);
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196 | addPropertyChangeListener("editor", handler);
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197 | }
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198 |
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199 | protected class ContextMenuHandler extends MouseAdapter implements PropertyChangeListener {
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200 |
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201 | private JTextComponent component;
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202 | private PopupMenuLauncher launcher;
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203 |
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204 | @Override public void propertyChange(PropertyChangeEvent evt) {
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205 | if (evt.getPropertyName().equals("editable")) {
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206 | if (evt.getNewValue().equals(true)) {
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207 | enableMenu();
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208 | } else {
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209 | disableMenu();
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210 | }
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211 | } else if (evt.getPropertyName().equals("editor")) {
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212 | disableMenu();
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213 | if (isEditable()) {
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214 | enableMenu();
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215 | }
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216 | }
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217 | }
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218 |
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219 | private void enableMenu() {
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220 | if (launcher == null) {
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221 | ComboBoxEditor editor = getEditor();
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222 | if (editor != null) {
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223 | Component editorComponent = editor.getEditorComponent();
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224 | if (editorComponent instanceof JTextComponent) {
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225 | component = (JTextComponent) editorComponent;
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226 | component.addMouseListener(this);
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227 | launcher = TextContextualPopupMenu.enableMenuFor(component);
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228 | }
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229 | }
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230 | }
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231 | }
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232 |
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233 | private void disableMenu() {
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234 | if (launcher != null) {
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235 | TextContextualPopupMenu.disableMenuFor(component, launcher);
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236 | launcher = null;
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237 | component.removeMouseListener(this);
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238 | component = null;
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239 | }
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240 | }
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241 |
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242 | @Override public void mousePressed(MouseEvent e) { processEvent(e); }
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243 | @Override public void mouseClicked(MouseEvent e) { processEvent(e); }
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244 | @Override public void mouseReleased(MouseEvent e) { processEvent(e); }
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245 |
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246 | private void processEvent(MouseEvent e) {
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247 | if (launcher != null && !e.isPopupTrigger()) {
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248 | if (launcher.getMenu().isShowing()) {
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249 | launcher.getMenu().setVisible(false);
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250 | }
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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 | /**
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256 | * Reinitializes this {@link JosmComboBox} to the specified values. This may needed if a custom renderer is used.
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257 | * @param values The values displayed in the combo box.
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258 | * @since 5558
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259 | */
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260 | public final void reinitialize(Collection<?> values) {
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261 | init(findPrototypeDisplayValue(values));
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262 | }
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263 | }
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