001    // License: GPL. See LICENSE file for details.
002    package org.openstreetmap.josm.gui;
003    
004    import static org.openstreetmap.josm.tools.I18n.tr;
005    
006    import java.awt.AlphaComposite;
007    import java.awt.Color;
008    import java.awt.Graphics;
009    import java.awt.Graphics2D;
010    import java.awt.Point;
011    import java.awt.Rectangle;
012    import java.awt.event.ComponentAdapter;
013    import java.awt.event.ComponentEvent;
014    import java.awt.event.MouseEvent;
015    import java.awt.event.MouseMotionListener;
016    import java.awt.geom.Area;
017    import java.awt.geom.GeneralPath;
018    import java.awt.image.BufferedImage;
019    import java.beans.PropertyChangeEvent;
020    import java.beans.PropertyChangeListener;
021    import java.util.ArrayList;
022    import java.util.Collection;
023    import java.util.Collections;
024    import java.util.Comparator;
025    import java.util.Enumeration;
026    import java.util.LinkedList;
027    import java.util.List;
028    import java.util.concurrent.CopyOnWriteArrayList;
029    
030    import javax.swing.AbstractButton;
031    import javax.swing.ActionMap;
032    import javax.swing.InputMap;
033    import javax.swing.JOptionPane;
034    import javax.swing.JPanel;
035    
036    import org.openstreetmap.josm.Main;
037    import org.openstreetmap.josm.actions.AutoScaleAction;
038    import org.openstreetmap.josm.actions.mapmode.MapMode;
039    import org.openstreetmap.josm.data.Bounds;
040    import org.openstreetmap.josm.data.Preferences.PreferenceChangeEvent;
041    import org.openstreetmap.josm.data.Preferences.PreferenceChangedListener;
042    import org.openstreetmap.josm.data.SelectionChangedListener;
043    import org.openstreetmap.josm.data.coor.LatLon;
044    import org.openstreetmap.josm.data.osm.DataSet;
045    import org.openstreetmap.josm.data.osm.DataSource;
046    import org.openstreetmap.josm.data.osm.OsmPrimitive;
047    import org.openstreetmap.josm.data.osm.visitor.BoundingXYVisitor;
048    import org.openstreetmap.josm.data.osm.visitor.paint.PaintColors;
049    import org.openstreetmap.josm.data.osm.visitor.paint.relations.MultipolygonCache;
050    import org.openstreetmap.josm.gui.layer.GpxLayer;
051    import org.openstreetmap.josm.gui.layer.Layer;
052    import org.openstreetmap.josm.gui.layer.MapViewPaintable;
053    import org.openstreetmap.josm.gui.layer.OsmDataLayer;
054    import org.openstreetmap.josm.gui.layer.markerlayer.MarkerLayer;
055    import org.openstreetmap.josm.gui.layer.markerlayer.PlayHeadMarker;
056    import org.openstreetmap.josm.tools.AudioPlayer;
057    import org.openstreetmap.josm.tools.BugReportExceptionHandler;
058    
059    /**
060     * This is a component used in the {@link MapFrame} for browsing the map. It use is to
061     * provide the MapMode's enough capabilities to operate.<br/><br/>
062     *
063     * {@code MapView} holds meta-data about the data set currently displayed, as scale level,
064     * center point viewed, what scrolling mode or editing mode is selected or with
065     * what projection the map is viewed etc..<br/><br/>
066     *
067     * {@code MapView} is able to administrate several layers.
068     *
069     * @author imi
070     */
071    public class MapView extends NavigatableComponent implements PropertyChangeListener, PreferenceChangedListener {
072    
073        /**
074         * Interface to notify listeners of a layer change.
075         * @author imi
076         */
077        public interface LayerChangeListener {
078            
079            /**
080             * Notifies this listener that the active layer has changed.
081             * @param oldLayer The previous active layer
082             * @param newLayer The new activer layer
083             */
084            void activeLayerChange(Layer oldLayer, Layer newLayer);
085            
086            /**
087             * Notifies this listener that a layer has been added.
088             * @param newLayer The new added layer
089             */
090            void layerAdded(Layer newLayer);
091            
092            /**
093             * Notifies this listener that a layer has been removed.
094             * @param oldLayer The old removed layer
095             */
096            void layerRemoved(Layer oldLayer);
097        }
098    
099        public interface EditLayerChangeListener {
100            void editLayerChanged(OsmDataLayer oldLayer, OsmDataLayer newLayer);
101        }
102    
103        public boolean viewportFollowing = false;
104    
105        /**
106         * the layer listeners
107         */
108        private static final CopyOnWriteArrayList<LayerChangeListener> layerChangeListeners = new CopyOnWriteArrayList<LayerChangeListener>();
109        private static final CopyOnWriteArrayList<EditLayerChangeListener> editLayerChangeListeners = new CopyOnWriteArrayList<EditLayerChangeListener>();
110    
111        /**
112         * Removes a layer change listener
113         *
114         * @param listener the listener. Ignored if null or already registered.
115         */
116        public static void removeLayerChangeListener(LayerChangeListener listener) {
117            layerChangeListeners.remove(listener);
118        }
119    
120        public static void removeEditLayerChangeListener(EditLayerChangeListener listener) {
121            editLayerChangeListeners.remove(listener);
122        }
123    
124        /**
125         * Adds a layer change listener
126         *
127         * @param listener the listener. Ignored if null or already registered.
128         */
129        public static void addLayerChangeListener(LayerChangeListener listener) {
130            if (listener != null) {
131                layerChangeListeners.addIfAbsent(listener);
132            }
133        }
134    
135        /**
136         * Adds an edit layer change listener
137         *
138         * @param listener the listener. Ignored if null or already registered.
139         * @param initialFire Fire an edit-layer-changed-event right after adding
140         * the listener in case there is an edit layer present
141         */
142        public static void addEditLayerChangeListener(EditLayerChangeListener listener, boolean initialFire) {
143            addEditLayerChangeListener(listener);
144            if (initialFire) {
145                if (Main.isDisplayingMapView() && Main.map.mapView.getEditLayer() != null) {
146                    fireEditLayerChanged(null, Main.map.mapView.getEditLayer());
147                }
148            }
149        }
150    
151        /**
152         * Adds an edit layer change listener
153         *
154         * @param listener the listener. Ignored if null or already registered.
155         */
156        public static void addEditLayerChangeListener(EditLayerChangeListener listener) {
157            if (listener != null) {
158                editLayerChangeListeners.addIfAbsent(listener);
159            }
160        }
161    
162        protected static void fireActiveLayerChanged(Layer oldLayer, Layer newLayer) {
163            for (LayerChangeListener l : layerChangeListeners) {
164                l.activeLayerChange(oldLayer, newLayer);
165            }
166        }
167    
168        protected static void fireLayerAdded(Layer newLayer) {
169            for (MapView.LayerChangeListener l : MapView.layerChangeListeners) {
170                l.layerAdded(newLayer);
171            }
172        }
173    
174        protected static void fireLayerRemoved(Layer layer) {
175            for (MapView.LayerChangeListener l : MapView.layerChangeListeners) {
176                l.layerRemoved(layer);
177            }
178        }
179    
180        protected static void fireEditLayerChanged(OsmDataLayer oldLayer, OsmDataLayer newLayer) {
181            for (EditLayerChangeListener l : editLayerChangeListeners) {
182                l.editLayerChanged(oldLayer, newLayer);
183            }
184        }
185    
186        /**
187         * A list of all layers currently loaded.
188         */
189        private final List<Layer> layers = new ArrayList<Layer>();
190        /**
191         * The play head marker: there is only one of these so it isn't in any specific layer
192         */
193        public PlayHeadMarker playHeadMarker = null;
194    
195        /**
196         * The layer from the layers list that is currently active.
197         */
198        private Layer activeLayer;
199    
200        private OsmDataLayer editLayer;
201    
202        /**
203         * The last event performed by mouse.
204         */
205        public MouseEvent lastMEvent = new MouseEvent(this, 0, 0, 0, 0, 0, 0, false); // In case somebody reads it before first mouse move
206    
207        private LinkedList<MapViewPaintable> temporaryLayers = new LinkedList<MapViewPaintable>();
208    
209        private BufferedImage nonChangedLayersBuffer;
210        private BufferedImage offscreenBuffer;
211        // Layers that wasn't changed since last paint
212        private final List<Layer> nonChangedLayers = new ArrayList<Layer>();
213        private Layer changedLayer;
214        private int lastViewID;
215        private boolean paintPreferencesChanged = true;
216        private Rectangle lastClipBounds = new Rectangle();
217        private MapMover mapMover;
218    
219        /**
220         * Constructs a new {@code MapView}.
221         * @param contentPane The content pane used to register shortcuts in its {@link InputMap} and {@link ActionMap}
222         */
223        public MapView(final JPanel contentPane) {
224            Main.pref.addPreferenceChangeListener(this);
225    
226            addComponentListener(new ComponentAdapter(){
227                @Override public void componentResized(ComponentEvent e) {
228                    removeComponentListener(this);
229    
230                    MapSlider zoomSlider = new MapSlider(MapView.this);
231                    add(zoomSlider);
232                    zoomSlider.setBounds(3, 0, 114, 30);
233    
234                    MapScaler scaler = new MapScaler(MapView.this);
235                    add(scaler);
236                    scaler.setLocation(10,30);
237    
238                    mapMover = new MapMover(MapView.this, contentPane);
239                    OsmDataLayer layer = getEditLayer();
240                    if (layer != null) {
241                        if (!zoomToDataSetBoundingBox(layer.data)) {
242                            // no bounding box defined
243                            AutoScaleAction.autoScale("data");
244                        }
245                    } else {
246                        AutoScaleAction.autoScale("layer");
247                    }
248                }
249            });
250    
251            // listend to selection changes to redraw the map
252            DataSet.addSelectionListener(repaintSelectionChangedListener);
253    
254            //store the last mouse action
255            this.addMouseMotionListener(new MouseMotionListener() {
256                public void mouseDragged(MouseEvent e) {
257                    mouseMoved(e);
258                }
259                public void mouseMoved(MouseEvent e) {
260                    lastMEvent = e;
261                }
262            });
263        }
264    
265        /**
266         * Adds a GPX layer. A GPX layer is added below the lowest data layer.
267         *
268         * @param layer the GPX layer
269         */
270        protected void addGpxLayer(GpxLayer layer) {
271            if (layers.isEmpty()) {
272                layers.add(layer);
273                return;
274            }
275            for (int i=layers.size()-1; i>= 0; i--) {
276                if (layers.get(i) instanceof OsmDataLayer) {
277                    if (i == layers.size()-1) {
278                        layers.add(layer);
279                    } else {
280                        layers.add(i+1, layer);
281                    }
282                    return;
283                }
284            }
285            layers.add(0, layer);
286        }
287    
288        /**
289         * Add a layer to the current MapView. The layer will be added at topmost
290         * position.
291         * @param layer The layer to add
292         */
293        public void addLayer(Layer layer) {
294            if (layer instanceof MarkerLayer && playHeadMarker == null) {
295                playHeadMarker = PlayHeadMarker.create();
296            }
297    
298            if (layer instanceof GpxLayer) {
299                addGpxLayer((GpxLayer)layer);
300            } else if (layers.isEmpty()) {
301                layers.add(layer);
302            } else if (layer.isBackgroundLayer()) {
303                int i = 0;
304                for (; i < layers.size(); i++) {
305                    if (layers.get(i).isBackgroundLayer()) {
306                        break;
307                    }
308                }
309                layers.add(i, layer);
310            } else {
311                layers.add(0, layer);
312            }
313            fireLayerAdded(layer);
314            boolean callSetActiveLayer = layer instanceof OsmDataLayer || activeLayer == null;
315            if (callSetActiveLayer) {
316                // autoselect the new layer
317                setActiveLayer(layer); // also repaints this MapView
318            }
319            layer.addPropertyChangeListener(this);
320            Main.addProjectionChangeListener(layer);
321            AudioPlayer.reset();
322            if (!callSetActiveLayer) {
323                repaint();
324            }
325        }
326    
327        @Override
328        protected DataSet getCurrentDataSet() {
329            if (editLayer != null)
330                return editLayer.data;
331            else
332                return null;
333        }
334    
335        /**
336         * Replies true if the active layer is drawable.
337         *
338         * @return true if the active layer is drawable, false otherwise
339         */
340        public boolean isActiveLayerDrawable() {
341            return editLayer != null;
342        }
343    
344        /**
345         * Replies true if the active layer is visible.
346         *
347         * @return true if the active layer is visible, false otherwise
348         */
349        public boolean isActiveLayerVisible() {
350            return isActiveLayerDrawable() && editLayer.isVisible();
351        }
352    
353        /**
354         * Determines the next active data layer according to the following
355         * rules:
356         * <ul>
357         *   <li>if there is at least one {@link OsmDataLayer} the first one
358         *     becomes active</li>
359         *   <li>otherwise, the top most layer of any type becomes active</li>
360         * </ul>
361         *
362         * @return the next active data layer
363         */
364        protected Layer determineNextActiveLayer(List<Layer> layersList) {
365            // First look for data layer
366            for (Layer layer:layersList) {
367                if (layer instanceof OsmDataLayer)
368                    return layer;
369            }
370    
371            // Then any layer
372            if (!layersList.isEmpty())
373                return layersList.get(0);
374    
375            // and then give up
376            return null;
377    
378        }
379    
380        /**
381         * Remove the layer from the mapview. If the layer was in the list before,
382         * an LayerChange event is fired.
383         * @param layer The layer to remove
384         */
385        public void removeLayer(Layer layer) {
386            List<Layer> layersList = new ArrayList<Layer>(layers);
387    
388            if (!layersList.remove(layer))
389                return;
390    
391            setEditLayer(layersList);
392    
393            if (layer == activeLayer) {
394                setActiveLayer(determineNextActiveLayer(layersList), false);
395            }
396    
397            layers.remove(layer);
398            Main.removeProjectionChangeListener(layer);
399            fireLayerRemoved(layer);
400            layer.removePropertyChangeListener(this);
401            layer.destroy();
402            AudioPlayer.reset();
403            repaint();
404        }
405    
406        private boolean virtualNodesEnabled = false;
407    
408        public void setVirtualNodesEnabled(boolean enabled) {
409            if(virtualNodesEnabled != enabled) {
410                virtualNodesEnabled = enabled;
411                repaint();
412            }
413        }
414        public boolean isVirtualNodesEnabled() {
415            return virtualNodesEnabled;
416        }
417    
418        /**
419         * Moves the layer to the given new position. No event is fired, but repaints
420         * according to the new Z-Order of the layers.
421         *
422         * @param layer     The layer to move
423         * @param pos       The new position of the layer
424         */
425        public void moveLayer(Layer layer, int pos) {
426            int curLayerPos = layers.indexOf(layer);
427            if (curLayerPos == -1)
428                throw new IllegalArgumentException(tr("Layer not in list."));
429            if (pos == curLayerPos)
430                return; // already in place.
431            layers.remove(curLayerPos);
432            if (pos >= layers.size()) {
433                layers.add(layer);
434            } else {
435                layers.add(pos, layer);
436            }
437            setEditLayer(layers);
438            AudioPlayer.reset();
439            repaint();
440        }
441    
442        public int getLayerPos(Layer layer) {
443            int curLayerPos = layers.indexOf(layer);
444            if (curLayerPos == -1)
445                throw new IllegalArgumentException(tr("Layer not in list."));
446            return curLayerPos;
447        }
448    
449        /**
450         * Creates a list of the visible layers in Z-Order, the layer with the lowest Z-Order
451         * first, layer with the highest Z-Order last.
452         *
453         * @return a list of the visible in Z-Order, the layer with the lowest Z-Order
454         * first, layer with the highest Z-Order last.
455         */
456        protected List<Layer> getVisibleLayersInZOrder() {
457            ArrayList<Layer> ret = new ArrayList<Layer>();
458            for (Layer l: layers) {
459                if (l.isVisible()) {
460                    ret.add(l);
461                }
462            }
463            // sort according to position in the list of layers, with one exception:
464            // an active data layer always becomes a higher Z-Order than all other
465            // data layers
466            //
467            Collections.sort(
468                    ret,
469                    new Comparator<Layer>() {
470                        public int compare(Layer l1, Layer l2) {
471                            if (l1 instanceof OsmDataLayer && l2 instanceof OsmDataLayer) {
472                                if (l1 == getActiveLayer()) return -1;
473                                if (l2 == getActiveLayer()) return 1;
474                                return Integer.valueOf(layers.indexOf(l1)).compareTo(layers.indexOf(l2));
475                            } else
476                                return Integer.valueOf(layers.indexOf(l1)).compareTo(layers.indexOf(l2));
477                        }
478                    }
479            );
480            Collections.reverse(ret);
481            return ret;
482        }
483    
484        private void paintLayer(Layer layer, Graphics2D g, Bounds box) {
485            if (layer.getOpacity() < 1) {
486                g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,(float)layer.getOpacity()));
487            }
488            layer.paint(g, this, box);
489            g.setPaintMode();
490        }
491    
492        /**
493         * Draw the component.
494         */
495        @Override public void paint(Graphics g) {
496            if (BugReportExceptionHandler.exceptionHandlingInProgress())
497                return;
498    
499            if (center == null)
500                return; // no data loaded yet.
501    
502            List<Layer> visibleLayers = getVisibleLayersInZOrder();
503    
504            int nonChangedLayersCount = 0;
505            for (Layer l: visibleLayers) {
506                if (l.isChanged() || l == changedLayer) {
507                    break;
508                } else {
509                    nonChangedLayersCount++;
510                }
511            }
512    
513            boolean canUseBuffer;
514            
515            synchronized (this) {
516                canUseBuffer = !paintPreferencesChanged;
517                paintPreferencesChanged = false;
518            }
519            canUseBuffer = canUseBuffer && nonChangedLayers.size() <= nonChangedLayersCount &&
520            lastViewID == getViewID() && lastClipBounds.contains(g.getClipBounds());
521            if (canUseBuffer) {
522                for (int i=0; i<nonChangedLayers.size(); i++) {
523                    if (visibleLayers.get(i) != nonChangedLayers.get(i)) {
524                        canUseBuffer = false;
525                        break;
526                    }
527                }
528            }
529    
530            if (null == offscreenBuffer || offscreenBuffer.getWidth() != getWidth() || offscreenBuffer.getHeight() != getHeight()) {
531                offscreenBuffer = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_3BYTE_BGR);
532            }
533    
534            Graphics2D tempG = offscreenBuffer.createGraphics();
535            tempG.setClip(g.getClip());
536            Bounds box = getLatLonBounds(g.getClipBounds());
537    
538            if (!canUseBuffer || nonChangedLayersBuffer == null) {
539                if (null == nonChangedLayersBuffer || nonChangedLayersBuffer.getWidth() != getWidth() || nonChangedLayersBuffer.getHeight() != getHeight()) {
540                    nonChangedLayersBuffer = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_3BYTE_BGR);
541                }
542                Graphics2D g2 = nonChangedLayersBuffer.createGraphics();
543                g2.setClip(g.getClip());
544                g2.setColor(PaintColors.getBackgroundColor());
545                g2.fillRect(0, 0, getWidth(), getHeight());
546    
547                for (int i=0; i<nonChangedLayersCount; i++) {
548                    paintLayer(visibleLayers.get(i),g2, box);
549                }
550            } else {
551                // Maybe there were more unchanged layers then last time - draw them to buffer
552                if (nonChangedLayers.size() != nonChangedLayersCount) {
553                    Graphics2D g2 = nonChangedLayersBuffer.createGraphics();
554                    g2.setClip(g.getClip());
555                    for (int i=nonChangedLayers.size(); i<nonChangedLayersCount; i++) {
556                        paintLayer(visibleLayers.get(i),g2, box);
557                    }
558                }
559            }
560    
561            nonChangedLayers.clear();
562            changedLayer = null;
563            for (int i=0; i<nonChangedLayersCount; i++) {
564                nonChangedLayers.add(visibleLayers.get(i));
565            }
566            lastViewID = getViewID();
567            lastClipBounds = g.getClipBounds();
568    
569            tempG.drawImage(nonChangedLayersBuffer, 0, 0, null);
570    
571            for (int i=nonChangedLayersCount; i<visibleLayers.size(); i++) {
572                paintLayer(visibleLayers.get(i),tempG, box);
573            }
574    
575            for (MapViewPaintable mvp : temporaryLayers) {
576                mvp.paint(tempG, this, box);
577            }
578    
579            // draw world borders
580            tempG.setColor(Color.WHITE);
581            Bounds b = getProjection().getWorldBoundsLatLon();
582            double lat = b.getMin().lat();
583            double lon = b.getMin().lon();
584    
585            Point p = getPoint(b.getMin());
586    
587            GeneralPath path = new GeneralPath();
588    
589            path.moveTo(p.x, p.y);
590            double max = b.getMax().lat();
591            for(; lat <= max; lat += 1.0)
592            {
593                p = getPoint(new LatLon(lat >= max ? max : lat, lon));
594                path.lineTo(p.x, p.y);
595            }
596            lat = max; max = b.getMax().lon();
597            for(; lon <= max; lon += 1.0)
598            {
599                p = getPoint(new LatLon(lat, lon >= max ? max : lon));
600                path.lineTo(p.x, p.y);
601            }
602            lon = max; max = b.getMin().lat();
603            for(; lat >= max; lat -= 1.0)
604            {
605                p = getPoint(new LatLon(lat <= max ? max : lat, lon));
606                path.lineTo(p.x, p.y);
607            }
608            lat = max; max = b.getMin().lon();
609            for(; lon >= max; lon -= 1.0)
610            {
611                p = getPoint(new LatLon(lat, lon <= max ? max : lon));
612                path.lineTo(p.x, p.y);
613            }
614    
615            int w = getWidth();
616            int h = getHeight();
617    
618            // Work around OpenJDK having problems when drawing out of bounds
619            final Area border = new Area(path);
620            // Make the viewport 1px larger in every direction to prevent an
621            // additional 1px border when zooming in
622            final Area viewport = new Area(new Rectangle(-1, -1, w + 2, h + 2));
623            border.intersect(viewport);
624            tempG.draw(border);
625    
626            if (Main.isDisplayingMapView() && Main.map.filterDialog != null) {
627                Main.map.filterDialog.drawOSDText(tempG);
628            }
629    
630            if (playHeadMarker != null) {
631                playHeadMarker.paint(tempG, this);
632            }
633    
634            g.drawImage(offscreenBuffer, 0, 0, null);
635            super.paint(g);
636        }
637    
638        /**
639         * Set the new dimension to the view.
640         */
641        public void recalculateCenterScale(BoundingXYVisitor box) {
642            if (box == null) {
643                box = new BoundingXYVisitor();
644            }
645            if (box.getBounds() == null) {
646                box.visit(getProjection().getWorldBoundsLatLon());
647            }
648            if (!box.hasExtend()) {
649                box.enlargeBoundingBox();
650            }
651    
652            zoomTo(box.getBounds());
653        }
654    
655        /**
656         * @return An unmodifiable collection of all layers
657         */
658        public Collection<Layer> getAllLayers() {
659            return Collections.unmodifiableCollection(layers);
660        }
661    
662        /**
663         * @return An unmodifiable ordered list of all layers
664         */
665        public List<Layer> getAllLayersAsList() {
666            return Collections.unmodifiableList(layers);
667        }
668    
669        /**
670         * Replies an unmodifiable list of layers of a certain type.
671         *
672         * Example:
673         * <pre>
674         *     List<WMSLayer> wmsLayers = getLayersOfType(WMSLayer.class);
675         * </pre>
676         *
677         * @return an unmodifiable list of layers of a certain type.
678         */
679        public <T> List<T>  getLayersOfType(Class<T> ofType) {
680            ArrayList<T> ret = new ArrayList<T>();
681            for (Layer layer : getAllLayersAsList()) {
682                if (ofType.isInstance(layer)) {
683                    ret.add(ofType.cast(layer));
684                }
685            }
686            return ret;
687        }
688    
689        /**
690         * Replies the number of layers managed by this mav view
691         *
692         * @return the number of layers managed by this mav view
693         */
694        public int getNumLayers() {
695            return layers.size();
696        }
697    
698        /**
699         * Replies true if there is at least one layer in this map view
700         *
701         * @return true if there is at least one layer in this map view
702         */
703        public boolean hasLayers() {
704            return getNumLayers() > 0;
705        }
706    
707        private void setEditLayer(List<Layer> layersList) {
708            OsmDataLayer newEditLayer = layersList.contains(editLayer)?editLayer:null;
709            OsmDataLayer oldEditLayer = editLayer;
710    
711            // Find new edit layer
712            if (activeLayer != editLayer || !layersList.contains(editLayer)) {
713                if (activeLayer instanceof OsmDataLayer && layersList.contains(activeLayer)) {
714                    newEditLayer = (OsmDataLayer) activeLayer;
715                } else {
716                    for (Layer layer:layersList) {
717                        if (layer instanceof OsmDataLayer) {
718                            newEditLayer = (OsmDataLayer) layer;
719                            break;
720                        }
721                    }
722                }
723            }
724    
725            // Set new edit layer
726            if (newEditLayer != editLayer) {
727                if (newEditLayer == null) {
728                    getCurrentDataSet().setSelected();
729                }
730    
731                editLayer = newEditLayer;
732                fireEditLayerChanged(oldEditLayer, newEditLayer);
733                refreshTitle();
734            }
735    
736        }
737    
738        /**
739         * Sets the active layer to <code>layer</code>. If <code>layer</code> is an instance
740         * of {@link OsmDataLayer} also sets {@link #editLayer} to <code>layer</code>.
741         *
742         * @param layer the layer to be activate; must be one of the layers in the list of layers
743         * @exception IllegalArgumentException thrown if layer is not in the lis of layers
744         */
745        public void setActiveLayer(Layer layer) {
746            setActiveLayer(layer, true);
747        }
748    
749        private void setActiveLayer(Layer layer, boolean setEditLayer) {
750            if (layer != null && !layers.contains(layer))
751                throw new IllegalArgumentException(tr("Layer ''{0}'' must be in list of layers", layer.toString()));
752    
753            if (layer == activeLayer)
754                return;
755    
756            Layer old = activeLayer;
757            activeLayer = layer;
758            if (setEditLayer) {
759                setEditLayer(layers);
760            }
761            fireActiveLayerChanged(old, layer);
762    
763            /* This only makes the buttons look disabled. Disabling the actions as well requires
764             * the user to re-select the tool after i.e. moving a layer. While testing I found
765             * that I switch layers and actions at the same time and it was annoying to mind the
766             * order. This way it works as visual clue for new users */
767            for (Enumeration<AbstractButton> e = Main.map.toolGroup.getElements() ; e.hasMoreElements() ;) {
768                AbstractButton button = e.nextElement();
769                MapMode mode = (MapMode)button.getAction();
770                boolean isLayerSupported = mode.layerIsSupported(layer);
771                button.setEnabled(isLayerSupported);
772                // Also update associated shortcut (fix #6876)
773                if (isLayerSupported) {
774                    Main.registerActionShortcut(mode, mode.getShortcut());
775                } else {
776                    Main.unregisterShortcut(mode.getShortcut());
777                }
778            }
779            AudioPlayer.reset();
780            repaint();
781        }
782    
783        /**
784         * Replies the currently active layer
785         *
786         * @return the currently active layer (may be null)
787         */
788        public Layer getActiveLayer() {
789            return activeLayer;
790        }
791    
792        /**
793         * Replies the current edit layer, if any
794         *
795         * @return the current edit layer. May be null.
796         */
797        public OsmDataLayer getEditLayer() {
798            return editLayer;
799        }
800    
801        /**
802         * replies true if the list of layers managed by this map view contain layer
803         *
804         * @param layer the layer
805         * @return true if the list of layers managed by this map view contain layer
806         */
807        public boolean hasLayer(Layer layer) {
808            return layers.contains(layer);
809        }
810    
811        /**
812         * Tries to zoom to the download boundingbox[es] of the current edit layer
813         * (aka {@link OsmDataLayer}). If the edit layer has multiple download bounding
814         * boxes it zooms to a large virtual bounding box containing all smaller ones.
815         *
816         * @return <code>true</code> if a zoom operation has been performed
817         */
818        public boolean zoomToDataSetBoundingBox(DataSet ds) {
819            // In case we already have an existing data layer ...
820            OsmDataLayer layer= getEditLayer();
821            if (layer == null)
822                return false;
823            Collection<DataSource> dataSources = ds.dataSources;
824            // ... with bounding box[es] of data loaded from OSM or a file...
825            BoundingXYVisitor bbox = new BoundingXYVisitor();
826            for (DataSource source : dataSources) {
827                bbox.visit(source.bounds);
828            }
829            if (bbox.hasExtend()) {
830                // ... we zoom to it's bounding box
831                recalculateCenterScale(bbox);
832                return true;
833            }
834            return false;
835        }
836    
837        public boolean addTemporaryLayer(MapViewPaintable mvp) {
838            if (temporaryLayers.contains(mvp)) return false;
839            return temporaryLayers.add(mvp);
840        }
841    
842        public boolean removeTemporaryLayer(MapViewPaintable mvp) {
843            return temporaryLayers.remove(mvp);
844        }
845    
846        public void propertyChange(PropertyChangeEvent evt) {
847            if (evt.getPropertyName().equals(Layer.VISIBLE_PROP)) {
848                repaint();
849            } else if (evt.getPropertyName().equals(Layer.OPACITY_PROP)) {
850                Layer l = (Layer)evt.getSource();
851                if (l.isVisible()) {
852                    changedLayer = l;
853                    repaint();
854                }
855            } else if (evt.getPropertyName().equals(OsmDataLayer.REQUIRES_SAVE_TO_DISK_PROP)
856                    || evt.getPropertyName().equals(OsmDataLayer.REQUIRES_UPLOAD_TO_SERVER_PROP)) {
857                OsmDataLayer layer = (OsmDataLayer)evt.getSource();
858                if (layer == getEditLayer()) {
859                    refreshTitle();
860                }
861            }
862        }
863    
864        protected void refreshTitle() {
865            boolean dirty = editLayer != null && (editLayer.requiresSaveToFile() || editLayer.requiresUploadToServer());
866            if (dirty) {
867                JOptionPane.getFrameForComponent(Main.parent).setTitle("* " + tr("Java OpenStreetMap Editor"));
868            } else {
869                JOptionPane.getFrameForComponent(Main.parent).setTitle(tr("Java OpenStreetMap Editor"));
870            }
871        }
872    
873        @Override
874        public void preferenceChanged(PreferenceChangeEvent e) {
875            synchronized (this) {
876                paintPreferencesChanged = true;
877            }
878        }
879    
880        private SelectionChangedListener repaintSelectionChangedListener = new SelectionChangedListener(){
881            public void selectionChanged(Collection<? extends OsmPrimitive> newSelection) {
882                repaint();
883            }
884        };
885    
886        public void destroy() {
887            Main.pref.removePreferenceChangeListener(this);
888            DataSet.removeSelectionListener(repaintSelectionChangedListener);
889            MultipolygonCache.getInstance().clear(this);
890            if (mapMover != null) {
891                mapMover.destroy();
892            }
893        }
894    
895    }