1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.osm.event;
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3 |
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4 | import java.util.Collection;
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5 | import java.util.List;
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6 | import java.util.Objects;
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7 | import java.util.concurrent.CopyOnWriteArrayList;
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8 |
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9 | import javax.swing.SwingUtilities;
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10 |
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11 | import org.openstreetmap.josm.data.SelectionChangedListener;
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12 | import org.openstreetmap.josm.data.osm.DataSet;
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13 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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14 | import org.openstreetmap.josm.data.osm.event.DatasetEventManager.FireMode;
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15 |
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16 | /**
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17 | * Similar like {@link DatasetEventManager}, just for selection events. Because currently selection changed
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18 | * event are global, only FIRE_IN_EDT and FIRE_EDT_CONSOLIDATED modes are really useful
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19 | *
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20 | */
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21 | public class SelectionEventManager implements SelectionChangedListener {
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22 |
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23 | private static final SelectionEventManager instance = new SelectionEventManager();
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24 |
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25 | public static SelectionEventManager getInstance() {
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26 | return instance;
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27 | }
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28 |
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29 | private static class ListenerInfo {
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30 | private final SelectionChangedListener listener;
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31 |
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32 | ListenerInfo(SelectionChangedListener listener) {
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33 | this.listener = listener;
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34 | }
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35 |
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36 | @Override
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37 | public int hashCode() {
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38 | return Objects.hash(listener);
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39 | }
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40 |
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41 | @Override
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42 | public boolean equals(Object o) {
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43 | if (this == o) return true;
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44 | if (o == null || getClass() != o.getClass()) return false;
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45 | ListenerInfo that = (ListenerInfo) o;
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46 | return Objects.equals(listener, that.listener);
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47 | }
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48 | }
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49 |
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50 | private Collection<? extends OsmPrimitive> selection;
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51 | private final CopyOnWriteArrayList<ListenerInfo> inEDTListeners = new CopyOnWriteArrayList<>();
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52 | private final CopyOnWriteArrayList<ListenerInfo> normalListeners = new CopyOnWriteArrayList<>();
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53 |
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54 | /**
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55 | * Constructs a new {@code SelectionEventManager}.
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56 | */
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57 | public SelectionEventManager() {
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58 | DataSet.addSelectionListener(this);
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59 | }
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60 |
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61 | public void addSelectionListener(SelectionChangedListener listener, FireMode fireMode) {
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62 | if (fireMode == FireMode.IN_EDT)
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63 | throw new UnsupportedOperationException("IN_EDT mode not supported, you probably want to use IN_EDT_CONSOLIDATED.");
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64 | if (fireMode == FireMode.IN_EDT || fireMode == FireMode.IN_EDT_CONSOLIDATED) {
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65 | inEDTListeners.addIfAbsent(new ListenerInfo(listener));
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66 | } else {
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67 | normalListeners.addIfAbsent(new ListenerInfo(listener));
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68 | }
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69 | }
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70 |
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71 | public void removeSelectionListener(SelectionChangedListener listener) {
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72 | ListenerInfo searchListener = new ListenerInfo(listener);
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73 | inEDTListeners.remove(searchListener);
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74 | normalListeners.remove(searchListener);
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75 | }
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76 |
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77 | @Override
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78 | public void selectionChanged(Collection<? extends OsmPrimitive> newSelection) {
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79 | fireEvents(normalListeners, newSelection);
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80 | selection = newSelection;
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81 | SwingUtilities.invokeLater(edtRunnable);
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82 | }
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83 |
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84 | private static void fireEvents(List<ListenerInfo> listeners, Collection<? extends OsmPrimitive> newSelection) {
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85 | for (ListenerInfo listener: listeners) {
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86 | listener.listener.selectionChanged(newSelection);
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87 | }
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88 | }
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89 |
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90 | private final Runnable edtRunnable = new Runnable() {
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91 | @Override
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92 | public void run() {
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93 | if (selection != null) {
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94 | fireEvents(inEDTListeners, selection);
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95 | }
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96 | }
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97 | };
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98 | }
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