1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.history;
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3 |
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4 | import java.awt.Dimension;
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5 | import java.awt.Point;
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6 | import java.util.ArrayList;
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7 | import java.util.HashMap;
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8 | import java.util.Map;
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9 |
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10 | import org.openstreetmap.josm.Main;
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11 | import org.openstreetmap.josm.data.osm.history.History;
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12 | import org.openstreetmap.josm.gui.layer.Layer;
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13 | import org.openstreetmap.josm.gui.layer.Layer.LayerChangeListener;
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14 | import org.openstreetmap.josm.tools.WindowGeometry;
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15 |
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16 | public class HistoryBrowserDialogManager implements LayerChangeListener {
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17 | static private HistoryBrowserDialogManager instance;
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18 | static public HistoryBrowserDialogManager getInstance() {
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19 | if (instance == null) {
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20 | instance = new HistoryBrowserDialogManager();
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21 | }
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22 | return instance;
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23 | }
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24 |
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25 | private Map<Long, HistoryBrowserDialog> dialogs;
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26 |
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27 | protected HistoryBrowserDialogManager() {
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28 | dialogs = new HashMap<Long, HistoryBrowserDialog>();
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29 | Layer.listeners.add(this);
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30 | }
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31 |
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32 | public boolean existsDialog(long id) {
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33 | return dialogs.containsKey(id);
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34 | }
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35 |
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36 | public void show(long id, HistoryBrowserDialog dialog) {
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37 | if (dialogs.values().contains(dialog)) {
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38 | show(id);
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39 | } else {
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40 | placeOnScreen(dialog);
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41 | dialog.setVisible(true);
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42 | dialogs.put(id, dialog);
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43 | }
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44 | }
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45 |
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46 | public void show(long id) {
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47 | if (dialogs.keySet().contains(id)) {
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48 | dialogs.get(id).toFront();
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49 | }
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50 | }
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51 |
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52 | protected boolean hasDialogWithCloseUpperLeftCorner(Point p) {
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53 | for (HistoryBrowserDialog dialog: dialogs.values()) {
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54 | Point corner = dialog.getLocation();
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55 | if (p.x >= corner.x -5 && corner.x + 5 >= p.x
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56 | && p.y >= corner.y -5 && corner.y + 5 >= p.y)
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57 | return true;
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58 | }
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59 | return false;
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60 | }
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61 |
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62 | public void placeOnScreen(HistoryBrowserDialog dialog) {
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63 | WindowGeometry geometry = WindowGeometry.centerOnScreen(new Dimension(800,500));
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64 | geometry.apply(dialog);
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65 | Point p = dialog.getLocation();
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66 | while(hasDialogWithCloseUpperLeftCorner(p)) {
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67 | p.x +=20;
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68 | p.y += 20;
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69 | }
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70 | dialog.setLocation(p);
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71 | }
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72 |
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73 | public void hide(HistoryBrowserDialog dialog) {
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74 | long id = 0;
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75 | for (long i: dialogs.keySet()) {
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76 | if (dialogs.get(i) == dialog) {
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77 | id = i;
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78 | break;
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79 | }
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80 | }
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81 | if (id > 0) {
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82 | dialogs.remove(id);
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83 | }
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84 | dialog.setVisible(false);
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85 | dialog.dispose();
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86 | }
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87 |
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88 | /**
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89 | * Hides and destroys all currently visible history browser dialogs
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90 | *
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91 | */
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92 | public void hideAll() {
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93 | ArrayList<HistoryBrowserDialog> dialogs = new ArrayList<HistoryBrowserDialog>();
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94 | dialogs.addAll(this.dialogs.values());
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95 | for (HistoryBrowserDialog dialog: dialogs) {
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96 | dialog.unlinkAsListener();
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97 | hide(dialog);
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98 | }
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99 | }
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100 |
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101 | public void show(History h) {
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102 | if (h == null)
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103 | return;
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104 | if (existsDialog(h.getId())) {
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105 | show(h.getId());
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106 | } else {
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107 | HistoryBrowserDialog dialog = new HistoryBrowserDialog(h);
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108 | show(h.getId(), dialog);
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109 | }
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110 | }
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111 |
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112 | /* ----------------------------------------------------------------------------- */
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113 | /* LayerChangeListener */
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114 | /* ----------------------------------------------------------------------------- */
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115 | public void activeLayerChange(Layer oldLayer, Layer newLayer) {}
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116 | public void layerAdded(Layer newLayer) {}
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117 |
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118 | public void layerRemoved(Layer oldLayer) {
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119 | // remove all history browsers if the number of layers drops to 0
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120 | //
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121 | if (Main.map.mapView.getNumLayers() == 0) {
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122 | hideAll();
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123 | }
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124 | }
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125 | }
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