1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.preferences.projection;
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3 |
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4 | import java.awt.GridBagLayout;
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5 | import java.awt.event.ActionListener;
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6 | import java.util.Collection;
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7 | import java.util.Collections;
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8 |
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9 | import javax.swing.JLabel;
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10 | import javax.swing.JPanel;
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11 |
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12 | import org.openstreetmap.josm.gui.widgets.JosmComboBox;
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13 | import org.openstreetmap.josm.tools.GBC;
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14 | import org.openstreetmap.josm.tools.Utils;
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15 |
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16 | /**
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17 | * A projection choice, that offers a list of projections in a combo-box.
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18 | */
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19 | public abstract class ListProjectionChoice extends AbstractProjectionChoice {
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20 |
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21 | protected int index; // 0-based index
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22 | protected int defaultIndex;
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23 | protected String[] entries;
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24 | protected String label;
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25 |
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26 | /**
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27 | * Constructs a new {@code ListProjectionChoice}.
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28 | *
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29 | * @param name the display name
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30 | * @param id the unique id for this ProjectionChoice
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31 | * @param entries the list of display entries for the combo-box
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32 | * @param label a label shown left to the combo-box
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33 | * @param defaultIndex the default index for the combo-box
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34 | */
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35 | public ListProjectionChoice(String name, String id, String[] entries, String label, int defaultIndex) {
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36 | super(name, id);
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37 | this.entries = Utils.copyArray(entries);
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38 | this.label = label;
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39 | this.defaultIndex = defaultIndex;
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40 | }
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41 |
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42 | /**
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43 | * Constructs a new {@code ListProjectionChoice}.
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44 | * @param name the display name
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45 | * @param id the unique id for this ProjectionChoice
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46 | * @param entries the list of display entries for the combo-box
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47 | * @param label a label shown left to the combo-box
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48 | */
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49 | public ListProjectionChoice(String name, String id, String[] entries, String label) {
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50 | this(name, id, entries, label, 0);
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51 | }
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52 |
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53 | /**
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54 | * Convert 0-based index to preference value.
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55 | * @param idx 0-based index
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56 | * @return preference value
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57 | * @see #zoneToIndex
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58 | */
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59 | protected abstract String indexToZone(int idx);
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60 |
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61 | /**
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62 | * Convert preference value to 0-based index.
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63 | * @param zone preference value
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64 | * @return 0-based index
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65 | * @see #indexToZone
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66 | */
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67 | protected abstract int zoneToIndex(String zone);
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68 |
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69 | @Override
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70 | public void setPreferences(Collection<String> args) {
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71 | String zone = null;
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72 | if (args != null && !args.isEmpty()) {
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73 | zone = args.iterator().next();
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74 | }
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75 | int idx;
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76 | if (zone == null) {
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77 | idx = defaultIndex;
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78 | } else {
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79 | idx = zoneToIndex(zone);
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80 | if (idx < 0 || idx >= entries.length) {
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81 | idx = defaultIndex;
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82 | }
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83 | }
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84 | this.index = idx;
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85 | }
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86 |
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87 | protected static class CBPanel extends JPanel {
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88 | public JosmComboBox<String> prefcb;
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89 |
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90 | public CBPanel(String[] entries, int initialIndex, String label, final ActionListener listener) {
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91 | prefcb = new JosmComboBox<>(entries);
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92 |
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93 | prefcb.setSelectedIndex(initialIndex);
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94 | this.setLayout(new GridBagLayout());
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95 | this.add(new JLabel(label), GBC.std().insets(5, 5, 0, 5));
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96 | this.add(GBC.glue(1, 0), GBC.std().fill(GBC.HORIZONTAL));
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97 | this.add(prefcb, GBC.eop().fill(GBC.HORIZONTAL));
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98 | this.add(GBC.glue(1, 1), GBC.eol().fill(GBC.BOTH));
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99 |
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100 | if (listener != null) {
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101 | prefcb.addActionListener(listener);
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102 | }
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103 | }
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104 | }
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105 |
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106 | @Override
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107 | public JPanel getPreferencePanel(ActionListener listener) {
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108 | return new CBPanel(entries, index, label, listener);
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109 | }
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110 |
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111 | @Override
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112 | public Collection<String> getPreferences(JPanel panel) {
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113 | if (!(panel instanceof CBPanel)) {
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114 | throw new IllegalArgumentException("Unsupported panel: "+panel);
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115 | }
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116 | CBPanel p = (CBPanel) panel;
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117 | int idx = p.prefcb.getSelectedIndex();
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118 | return Collections.singleton(indexToZone(idx));
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119 | }
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120 | }
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