001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.actions.mapmode;
003
004import static org.openstreetmap.josm.tools.I18n.marktr;
005import static org.openstreetmap.josm.tools.I18n.tr;
006import static org.openstreetmap.josm.tools.I18n.trn;
007
008import java.awt.BasicStroke;
009import java.awt.Color;
010import java.awt.Cursor;
011import java.awt.Graphics2D;
012import java.awt.Point;
013import java.awt.event.KeyEvent;
014import java.awt.event.MouseEvent;
015import java.util.ArrayList;
016import java.util.Collection;
017import java.util.Collections;
018import java.util.HashSet;
019import java.util.LinkedList;
020import java.util.List;
021import java.util.Set;
022
023import javax.swing.JOptionPane;
024
025import org.openstreetmap.josm.command.AddCommand;
026import org.openstreetmap.josm.command.ChangeCommand;
027import org.openstreetmap.josm.command.Command;
028import org.openstreetmap.josm.command.DeleteCommand;
029import org.openstreetmap.josm.command.MoveCommand;
030import org.openstreetmap.josm.command.SequenceCommand;
031import org.openstreetmap.josm.data.Bounds;
032import org.openstreetmap.josm.data.UndoRedoHandler;
033import org.openstreetmap.josm.data.coor.EastNorth;
034import org.openstreetmap.josm.data.osm.DataSelectionListener;
035import org.openstreetmap.josm.data.osm.DataSet;
036import org.openstreetmap.josm.data.osm.Node;
037import org.openstreetmap.josm.data.osm.OsmPrimitive;
038import org.openstreetmap.josm.data.osm.Way;
039import org.openstreetmap.josm.data.osm.WaySegment;
040import org.openstreetmap.josm.data.osm.event.AbstractDatasetChangedEvent;
041import org.openstreetmap.josm.data.osm.event.DataChangedEvent;
042import org.openstreetmap.josm.data.osm.event.DataSetListener;
043import org.openstreetmap.josm.data.osm.event.DatasetEventManager;
044import org.openstreetmap.josm.data.osm.event.DatasetEventManager.FireMode;
045import org.openstreetmap.josm.data.osm.event.NodeMovedEvent;
046import org.openstreetmap.josm.data.osm.event.PrimitivesAddedEvent;
047import org.openstreetmap.josm.data.osm.event.PrimitivesRemovedEvent;
048import org.openstreetmap.josm.data.osm.event.RelationMembersChangedEvent;
049import org.openstreetmap.josm.data.osm.event.SelectionEventManager;
050import org.openstreetmap.josm.data.osm.event.TagsChangedEvent;
051import org.openstreetmap.josm.data.osm.event.WayNodesChangedEvent;
052import org.openstreetmap.josm.data.preferences.CachingProperty;
053import org.openstreetmap.josm.data.preferences.IntegerProperty;
054import org.openstreetmap.josm.data.preferences.NamedColorProperty;
055import org.openstreetmap.josm.data.preferences.StrokeProperty;
056import org.openstreetmap.josm.gui.MainApplication;
057import org.openstreetmap.josm.gui.MapFrame;
058import org.openstreetmap.josm.gui.MapView;
059import org.openstreetmap.josm.gui.draw.MapViewPath;
060import org.openstreetmap.josm.gui.draw.SymbolShape;
061import org.openstreetmap.josm.gui.layer.AbstractMapViewPaintable;
062import org.openstreetmap.josm.gui.layer.Layer;
063import org.openstreetmap.josm.gui.util.ModifierExListener;
064import org.openstreetmap.josm.tools.ImageProvider;
065import org.openstreetmap.josm.tools.Logging;
066import org.openstreetmap.josm.tools.Pair;
067import org.openstreetmap.josm.tools.Shortcut;
068
069/**
070 * A special map mode that is optimized for improving way geometry.
071 * (by efficiently moving, adding and deleting way-nodes)
072 *
073 * @author Alexander Kachkaev <alexander@kachkaev.ru>, 2011
074 */
075public class ImproveWayAccuracyAction extends MapMode implements DataSelectionListener, DataSetListener, ModifierExListener {
076
077    private static final String CROSSHAIR = /* ICON(cursor/)*/ "crosshair";
078
079    enum State {
080        SELECTING, IMPROVING
081    }
082
083    private State state;
084
085    private MapView mv;
086
087    private static final long serialVersionUID = 42L;
088
089    private transient Way targetWay;
090    private transient Node candidateNode;
091    private transient WaySegment candidateSegment;
092
093    private Point mousePos;
094    private boolean dragging;
095
096    private final Cursor cursorSelect = ImageProvider.getCursor(/* ICON(cursor/)*/ "normal", /* ICON(cursor/modifier/)*/ "mode");
097    private final Cursor cursorSelectHover = ImageProvider.getCursor(/* ICON(cursor/)*/ "hand", /* ICON(cursor/modifier/)*/ "mode");
098    private final Cursor cursorImprove = ImageProvider.getCursor(CROSSHAIR, null);
099    private final Cursor cursorImproveAdd = ImageProvider.getCursor(CROSSHAIR, /* ICON(cursor/modifier/)*/ "addnode");
100    private final Cursor cursorImproveDelete = ImageProvider.getCursor(CROSSHAIR, /* ICON(cursor/modifier/)*/ "delete_node");
101    private final Cursor cursorImproveAddLock = ImageProvider.getCursor(CROSSHAIR, /* ICON(cursor/modifier/)*/ "add_node_lock");
102    private final Cursor cursorImproveLock = ImageProvider.getCursor(CROSSHAIR, /* ICON(cursor/modifier/)*/ "lock");
103
104    private Color guideColor;
105
106    private static final CachingProperty<BasicStroke> SELECT_TARGET_WAY_STROKE
107            = new StrokeProperty("improvewayaccuracy.stroke.select-target", "2").cached();
108    private static final CachingProperty<BasicStroke> MOVE_NODE_STROKE
109            = new StrokeProperty("improvewayaccuracy.stroke.move-node", "1 6").cached();
110    private static final CachingProperty<BasicStroke> MOVE_NODE_INTERSECTING_STROKE
111            = new StrokeProperty("improvewayaccuracy.stroke.move-node-intersecting", "1 2 6").cached();
112    private static final CachingProperty<BasicStroke> ADD_NODE_STROKE
113            = new StrokeProperty("improvewayaccuracy.stroke.add-node", "1").cached();
114    private static final CachingProperty<BasicStroke> DELETE_NODE_STROKE
115            = new StrokeProperty("improvewayaccuracy.stroke.delete-node", "1").cached();
116    private static final CachingProperty<Integer> DOT_SIZE
117            = new IntegerProperty("improvewayaccuracy.dot-size", 6).cached();
118
119    private boolean selectionChangedBlocked;
120
121    protected String oldModeHelpText;
122
123    private final transient AbstractMapViewPaintable temporaryLayer = new AbstractMapViewPaintable() {
124        @Override
125        public void paint(Graphics2D g, MapView mv, Bounds bbox) {
126            ImproveWayAccuracyAction.this.paint(g, mv, bbox);
127        }
128    };
129
130    /**
131     * Constructs a new {@code ImproveWayAccuracyAction}.
132     * @since 11713
133     */
134    public ImproveWayAccuracyAction() {
135        super(tr("Improve Way Accuracy"), "improvewayaccuracy",
136                tr("Improve Way Accuracy mode"),
137                Shortcut.registerShortcut("mapmode:ImproveWayAccuracy",
138                tr("Mode: {0}", tr("Improve Way Accuracy")),
139                KeyEvent.VK_W, Shortcut.DIRECT), Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
140
141        readPreferences();
142    }
143
144    // -------------------------------------------------------------------------
145    // Mode methods
146    // -------------------------------------------------------------------------
147    @Override
148    public void enterMode() {
149        if (!isEnabled()) {
150            return;
151        }
152        super.enterMode();
153        readPreferences();
154
155        MapFrame map = MainApplication.getMap();
156        mv = map.mapView;
157        mousePos = null;
158        oldModeHelpText = "";
159
160        if (getLayerManager().getEditDataSet() == null) {
161            return;
162        }
163
164        updateStateByCurrentSelection();
165
166        map.mapView.addMouseListener(this);
167        map.mapView.addMouseMotionListener(this);
168        map.mapView.addTemporaryLayer(temporaryLayer);
169        SelectionEventManager.getInstance().addSelectionListener(this);
170        DatasetEventManager.getInstance().addDatasetListener(this, FireMode.IMMEDIATELY);
171
172        map.keyDetector.addModifierExListener(this);
173    }
174
175    @Override
176    protected void readPreferences() {
177        guideColor = new NamedColorProperty(marktr("improve way accuracy helper line"), Color.RED).get();
178    }
179
180    @Override
181    public void exitMode() {
182        super.exitMode();
183
184        MapFrame map = MainApplication.getMap();
185        map.mapView.removeMouseListener(this);
186        map.mapView.removeMouseMotionListener(this);
187        map.mapView.removeTemporaryLayer(temporaryLayer);
188        SelectionEventManager.getInstance().removeSelectionListener(this);
189        DatasetEventManager.getInstance().removeDatasetListener(this);
190
191        map.keyDetector.removeModifierExListener(this);
192        temporaryLayer.invalidate();
193    }
194
195    @Override
196    protected void updateStatusLine() {
197        String newModeHelpText = getModeHelpText();
198        if (!newModeHelpText.equals(oldModeHelpText)) {
199            oldModeHelpText = newModeHelpText;
200            MapFrame map = MainApplication.getMap();
201            map.statusLine.setHelpText(newModeHelpText);
202            map.statusLine.repaint();
203        }
204    }
205
206    @Override
207    public String getModeHelpText() {
208        if (state == State.SELECTING) {
209            if (targetWay != null) {
210                return tr("Click on the way to start improving its shape.");
211            } else {
212                return tr("Select a way that you want to make more accurate.");
213            }
214        } else {
215            if (ctrl) {
216                return tr("Click to add a new node. Release Ctrl to move existing nodes or hold Alt to delete.");
217            } else if (alt) {
218                return tr("Click to delete the highlighted node. Release Alt to move existing nodes or hold Ctrl to add new nodes.");
219            } else {
220                return tr("Click to move the highlighted node. Hold Ctrl to add new nodes, or Alt to delete.");
221            }
222        }
223    }
224
225    @Override
226    public boolean layerIsSupported(Layer l) {
227        return isEditableDataLayer(l);
228    }
229
230    @Override
231    protected void updateEnabledState() {
232        setEnabled(getLayerManager().getEditLayer() != null);
233    }
234
235    // -------------------------------------------------------------------------
236    // MapViewPaintable methods
237    // -------------------------------------------------------------------------
238    /**
239     * Redraws temporary layer. Highlights targetWay in select mode. Draws
240     * preview lines in improve mode and highlights the candidateNode
241     * @param g The graphics
242     * @param mv The map view
243     * @param bbox The bounding box
244     */
245    public void paint(Graphics2D g, MapView mv, Bounds bbox) {
246        if (mousePos == null || (candidateNode != null && candidateNode.getDataSet() == null)) {
247            return;
248        }
249
250        g.setColor(guideColor);
251
252        if (state == State.SELECTING && targetWay != null) {
253            // Highlighting the targetWay in Selecting state
254            // Non-native highlighting is used, because sometimes highlighted
255            // segments are covered with others, which is bad.
256            BasicStroke stroke = SELECT_TARGET_WAY_STROKE.get();
257            g.setStroke(stroke);
258
259            List<Node> nodes = targetWay.getNodes();
260
261            g.draw(new MapViewPath(mv).append(nodes, false).computeClippedLine(stroke));
262
263        } else if (state == State.IMPROVING) {
264            // Drawing preview lines and highlighting the node
265            // that is going to be moved.
266            // Non-native highlighting is used here as well.
267
268            // Finding endpoints
269            Node p1 = null;
270            Node p2 = null;
271            if (ctrl && candidateSegment != null) {
272                g.setStroke(ADD_NODE_STROKE.get());
273                try {
274                    p1 = candidateSegment.getFirstNode();
275                    p2 = candidateSegment.getSecondNode();
276                } catch (ArrayIndexOutOfBoundsException e) {
277                    Logging.error(e);
278                }
279            } else if (!alt && !ctrl && candidateNode != null) {
280                g.setStroke(MOVE_NODE_STROKE.get());
281                List<Pair<Node, Node>> wpps = targetWay.getNodePairs(false);
282                for (Pair<Node, Node> wpp : wpps) {
283                    if (wpp.a == candidateNode) {
284                        p1 = wpp.b;
285                    }
286                    if (wpp.b == candidateNode) {
287                        p2 = wpp.a;
288                    }
289                    if (p1 != null && p2 != null) {
290                        break;
291                    }
292                }
293            } else if (alt && !ctrl && candidateNode != null) {
294                g.setStroke(DELETE_NODE_STROKE.get());
295                List<Node> nodes = targetWay.getNodes();
296                int index = nodes.indexOf(candidateNode);
297
298                // Only draw line if node is not first and/or last
299                if (index > 0 && index < (nodes.size() - 1)) {
300                    p1 = nodes.get(index - 1);
301                    p2 = nodes.get(index + 1);
302                } else if (targetWay.isClosed()) {
303                    p1 = targetWay.getNode(1);
304                    p2 = targetWay.getNode(nodes.size() - 2);
305                }
306                // TODO: indicate what part that will be deleted? (for end nodes)
307            }
308
309
310            // Drawing preview lines
311            MapViewPath b = new MapViewPath(mv);
312            if (alt && !ctrl) {
313                // In delete mode
314                if (p1 != null && p2 != null) {
315                    b.moveTo(p1);
316                    b.lineTo(p2);
317                }
318            } else {
319                // In add or move mode
320                if (p1 != null) {
321                    b.moveTo(mousePos.x, mousePos.y);
322                    b.lineTo(p1);
323                }
324                if (p2 != null) {
325                    b.moveTo(mousePos.x, mousePos.y);
326                    b.lineTo(p2);
327                }
328            }
329            g.draw(b.computeClippedLine(g.getStroke()));
330
331            // Highlighting candidateNode
332            if (candidateNode != null) {
333                p1 = candidateNode;
334                g.fill(new MapViewPath(mv).shapeAround(p1, SymbolShape.SQUARE, DOT_SIZE.get()));
335            }
336
337            if (!alt && !ctrl && candidateNode != null) {
338                b.reset();
339                drawIntersectingWayHelperLines(mv, b);
340                g.setStroke(MOVE_NODE_INTERSECTING_STROKE.get());
341                g.draw(b.computeClippedLine(g.getStroke()));
342            }
343
344        }
345    }
346
347    protected void drawIntersectingWayHelperLines(MapView mv, MapViewPath b) {
348        for (final OsmPrimitive referrer : candidateNode.getReferrers()) {
349            if (!(referrer instanceof Way) || targetWay.equals(referrer)) {
350                continue;
351            }
352            final List<Node> nodes = ((Way) referrer).getNodes();
353            for (int i = 0; i < nodes.size(); i++) {
354                if (!candidateNode.equals(nodes.get(i))) {
355                    continue;
356                }
357                if (i > 0) {
358                    b.moveTo(mousePos.x, mousePos.y);
359                    b.lineTo(nodes.get(i - 1));
360                }
361                if (i < nodes.size() - 1) {
362                    b.moveTo(mousePos.x, mousePos.y);
363                    b.lineTo(nodes.get(i + 1));
364                }
365            }
366        }
367    }
368
369    // -------------------------------------------------------------------------
370    // Event handlers
371    // -------------------------------------------------------------------------
372    @Override
373    public void modifiersExChanged(int modifiers) {
374        if (!MainApplication.isDisplayingMapView() || !MainApplication.getMap().mapView.isActiveLayerDrawable()) {
375            return;
376        }
377        updateKeyModifiersEx(modifiers);
378        updateCursorDependentObjectsIfNeeded();
379        updateCursor();
380        updateStatusLine();
381        temporaryLayer.invalidate();
382    }
383
384    @Override
385    public void selectionChanged(SelectionChangeEvent event) {
386        if (selectionChangedBlocked) {
387            return;
388        }
389        updateStateByCurrentSelection();
390    }
391
392    @Override
393    public void mouseDragged(MouseEvent e) {
394        dragging = true;
395        mouseMoved(e);
396    }
397
398    @Override
399    public void mouseMoved(MouseEvent e) {
400        if (!isEnabled()) {
401            return;
402        }
403
404        mousePos = e.getPoint();
405
406        updateKeyModifiers(e);
407        updateCursorDependentObjectsIfNeeded();
408        updateCursor();
409        updateStatusLine();
410        temporaryLayer.invalidate();
411    }
412
413    @Override
414    public void mouseReleased(MouseEvent e) {
415        dragging = false;
416        if (!isEnabled() || e.getButton() != MouseEvent.BUTTON1) {
417            return;
418        }
419
420        DataSet ds = getLayerManager().getEditDataSet();
421        updateKeyModifiers(e);
422        mousePos = e.getPoint();
423
424        if (state == State.SELECTING) {
425            if (targetWay != null) {
426                ds.setSelected(targetWay.getPrimitiveId());
427                updateStateByCurrentSelection();
428            }
429        } else if (state == State.IMPROVING) {
430            // Checking if the new coordinate is outside of the world
431            if (new Node(mv.getEastNorth(mousePos.x, mousePos.y)).isOutSideWorld()) {
432                JOptionPane.showMessageDialog(MainApplication.getMainFrame(),
433                        tr("Cannot add a node outside of the world."),
434                        tr("Warning"), JOptionPane.WARNING_MESSAGE);
435                return;
436            }
437
438            if (ctrl && !alt && candidateSegment != null) {
439                // Add a new node to the highlighted segment.
440                Collection<WaySegment> virtualSegments = new LinkedList<>();
441
442                // Check if other ways have the same segment.
443                // We have to make sure that we add the new node to all of them.
444                Set<Way> commonParentWays = new HashSet<>(candidateSegment.getFirstNode().getParentWays());
445                commonParentWays.retainAll(candidateSegment.getSecondNode().getParentWays());
446                for (Way w : commonParentWays) {
447                    for (int i = 0; i < w.getNodesCount() - 1; i++) {
448                        WaySegment testWS = new WaySegment(w, i);
449                        if (testWS.isSimilar(candidateSegment)) {
450                            virtualSegments.add(testWS);
451                        }
452                    }
453                }
454
455                Collection<Command> virtualCmds = new LinkedList<>();
456                // Create the new node
457                Node virtualNode = new Node(mv.getEastNorth(mousePos.x, mousePos.y));
458                virtualCmds.add(new AddCommand(ds, virtualNode));
459
460                // Adding the node to all segments found
461                for (WaySegment virtualSegment : virtualSegments) {
462                    Way w = virtualSegment.way;
463                    Way wnew = new Way(w);
464                    wnew.addNode(virtualSegment.lowerIndex + 1, virtualNode);
465                    virtualCmds.add(new ChangeCommand(w, wnew));
466                }
467
468                // Finishing the sequence command
469                String text = trn("Add a new node to way",
470                        "Add a new node to {0} ways",
471                        virtualSegments.size(), virtualSegments.size());
472
473                UndoRedoHandler.getInstance().add(new SequenceCommand(text, virtualCmds));
474
475            } else if (alt && !ctrl && candidateNode != null) {
476                // Deleting the highlighted node
477
478                //check to see if node is in use by more than one object
479                long referrersCount = candidateNode.referrers(OsmPrimitive.class).count();
480                long referrerWayCount = candidateNode.referrers(Way.class).count();
481                if (referrersCount != 1 || referrerWayCount != 1) {
482                    // detach node from way
483                    final Way newWay = new Way(targetWay);
484                    final List<Node> nodes = newWay.getNodes();
485                    nodes.remove(candidateNode);
486                    newWay.setNodes(nodes);
487                    if (nodes.size() < 2) {
488                        final Command deleteCmd = DeleteCommand.delete(Collections.singleton(targetWay), true);
489                        if (deleteCmd != null) {
490                            UndoRedoHandler.getInstance().add(deleteCmd);
491                        }
492                    } else {
493                        UndoRedoHandler.getInstance().add(new ChangeCommand(targetWay, newWay));
494                    }
495                } else if (candidateNode.isTagged()) {
496                    JOptionPane.showMessageDialog(MainApplication.getMainFrame(),
497                            tr("Cannot delete node that has tags"),
498                            tr("Error"), JOptionPane.ERROR_MESSAGE);
499                } else {
500                    final Command deleteCmd = DeleteCommand.delete(Collections.singleton(candidateNode), true);
501                    if (deleteCmd != null) {
502                        UndoRedoHandler.getInstance().add(deleteCmd);
503                    }
504                }
505
506            } else if (candidateNode != null) {
507                // Moving the highlighted node
508                EastNorth nodeEN = candidateNode.getEastNorth();
509                EastNorth cursorEN = mv.getEastNorth(mousePos.x, mousePos.y);
510
511                UndoRedoHandler.getInstance().add(
512                        new MoveCommand(candidateNode, cursorEN.east() - nodeEN.east(), cursorEN.north() - nodeEN.north()));
513            }
514        }
515
516        mousePos = null;
517        updateCursor();
518        updateStatusLine();
519        temporaryLayer.invalidate();
520    }
521
522    @Override
523    public void mouseExited(MouseEvent e) {
524        if (!isEnabled()) {
525            return;
526        }
527
528        if (!dragging) {
529            mousePos = null;
530        }
531        temporaryLayer.invalidate();
532    }
533
534    // -------------------------------------------------------------------------
535    // Custom methods
536    // -------------------------------------------------------------------------
537    /**
538     * Sets new cursor depending on state, mouse position
539     */
540    private void updateCursor() {
541        if (!isEnabled()) {
542            mv.setNewCursor(null, this);
543            return;
544        }
545
546        if (state == State.SELECTING) {
547            mv.setNewCursor(targetWay == null ? cursorSelect
548                    : cursorSelectHover, this);
549        } else if (state == State.IMPROVING) {
550            if (alt && !ctrl) {
551                mv.setNewCursor(cursorImproveDelete, this);
552            } else if (shift || dragging) {
553                if (ctrl) {
554                    mv.setNewCursor(cursorImproveAddLock, this);
555                } else {
556                    mv.setNewCursor(cursorImproveLock, this);
557                }
558            } else if (ctrl && !alt) {
559                mv.setNewCursor(cursorImproveAdd, this);
560            } else {
561                mv.setNewCursor(cursorImprove, this);
562            }
563        }
564    }
565
566    /**
567     * Updates these objects under cursor: targetWay, candidateNode,
568     * candidateSegment
569     */
570    public void updateCursorDependentObjectsIfNeeded() {
571        if (state == State.IMPROVING && (shift || dragging)
572                && !(candidateNode == null && candidateSegment == null)) {
573            return;
574        }
575
576        if (mousePos == null) {
577            candidateNode = null;
578            candidateSegment = null;
579            return;
580        }
581
582        if (state == State.SELECTING) {
583            targetWay = ImproveWayAccuracyHelper.findWay(mv, mousePos);
584        } else if (state == State.IMPROVING) {
585            if (ctrl && !alt) {
586                candidateSegment = ImproveWayAccuracyHelper.findCandidateSegment(mv,
587                        targetWay, mousePos);
588                candidateNode = null;
589            } else {
590                candidateNode = ImproveWayAccuracyHelper.findCandidateNode(mv,
591                        targetWay, mousePos);
592                candidateSegment = null;
593            }
594        }
595    }
596
597    /**
598     * Switches to Selecting state
599     */
600    public void startSelecting() {
601        state = State.SELECTING;
602
603        targetWay = null;
604
605        temporaryLayer.invalidate();
606        updateStatusLine();
607    }
608
609    /**
610     * Switches to Improving state
611     *
612     * @param targetWay Way that is going to be improved
613     */
614    public void startImproving(Way targetWay) {
615        state = State.IMPROVING;
616
617        DataSet ds = getLayerManager().getEditDataSet();
618        Collection<OsmPrimitive> currentSelection = ds.getSelected();
619        if (currentSelection.size() != 1
620                || !currentSelection.iterator().next().equals(targetWay)) {
621            selectionChangedBlocked = true;
622            ds.clearSelection();
623            ds.setSelected(targetWay.getPrimitiveId());
624            selectionChangedBlocked = false;
625        }
626
627        this.targetWay = targetWay;
628        this.candidateNode = null;
629        this.candidateSegment = null;
630
631        temporaryLayer.invalidate();
632        updateStatusLine();
633    }
634
635    /**
636     * Updates the state according to the current selection. Goes to Improve
637     * state if a single way or node is selected. Extracts a way by a node in
638     * the second case.
639     */
640    private void updateStateByCurrentSelection() {
641        final List<Node> nodeList = new ArrayList<>();
642        final List<Way> wayList = new ArrayList<>();
643        final DataSet ds = getLayerManager().getEditDataSet();
644        if (ds != null) {
645            final Collection<OsmPrimitive> sel = ds.getSelected();
646
647            // Collecting nodes and ways from the selection
648            for (OsmPrimitive p : sel) {
649                if (p instanceof Way) {
650                    wayList.add((Way) p);
651                }
652                if (p instanceof Node) {
653                    nodeList.add((Node) p);
654                }
655            }
656
657            if (wayList.size() == 1) {
658                // Starting improving the single selected way
659                startImproving(wayList.get(0));
660                return;
661            } else if (nodeList.size() == 1) {
662                // Starting improving the only way of the single selected node
663                List<OsmPrimitive> r = nodeList.get(0).getReferrers();
664                if (r.size() == 1 && (r.get(0) instanceof Way)) {
665                    startImproving((Way) r.get(0));
666                    return;
667                }
668            }
669        }
670
671        // Starting selecting by default
672        startSelecting();
673    }
674
675    @Override
676    public void primitivesRemoved(PrimitivesRemovedEvent event) {
677        if (event.getPrimitives().contains(candidateNode) || event.getPrimitives().contains(targetWay)) {
678            updateCursorDependentObjectsIfNeeded();
679        }
680    }
681
682    @Override
683    public void primitivesAdded(PrimitivesAddedEvent event) {
684        // Do nothing
685    }
686
687    @Override
688    public void tagsChanged(TagsChangedEvent event) {
689        // Do nothing
690    }
691
692    @Override
693    public void nodeMoved(NodeMovedEvent event) {
694        // Do nothing
695    }
696
697    @Override
698    public void wayNodesChanged(WayNodesChangedEvent event) {
699        // Do nothing
700    }
701
702    @Override
703    public void relationMembersChanged(RelationMembersChangedEvent event) {
704        // Do nothing
705    }
706
707    @Override
708    public void otherDatasetChange(AbstractDatasetChangedEvent event) {
709        // Do nothing
710    }
711
712    @Override
713    public void dataChanged(DataChangedEvent event) {
714        // Do nothing
715    }
716}