New upstream version 0.32.1upstream/0.32.1

1 files changed, 788 insertions, 0 deletions

diff --git a/src/MapWidget.vala b/src/MapWidget.vala
new file mode 100644
index 0000000..ddfae38
--- /dev/null
+++ b/src/MapWidget.vala
@@ -0,0 +1,788 @@
+/* Copyright 2016 Software Freedom Conservancy Inc.
+ *
+ * This software is licensed under the GNU LGPL (version 2.1 or later).
+ * See the COPYING file in this distribution.
+ */
+
+private class MarkerImageSet {
+    public float marker_image_width;
+    public float marker_image_height;
+    public Clutter.Image? marker_image;
+    public Clutter.Image? marker_selected_image;
+    public Clutter.Image? marker_highlighted_image;
+}
+
+private enum SelectionAction {
+    SET,
+    ADD,
+    REMOVE
+}
+
+private abstract class PositionMarker : Object {
+    protected bool _highlighted = false;
+    protected bool _selected = false;
+    protected MarkerImageSet image_set;
+
+    protected PositionMarker(Champlain.Marker champlain_marker, MarkerImageSet image_set) {
+        this.champlain_marker = champlain_marker;
+        this.image_set = image_set;
+        champlain_marker.selectable = true;
+        champlain_marker.set_content(image_set.marker_image);
+        float w = image_set.marker_image_width;
+        float h = image_set.marker_image_height;
+        champlain_marker.set_size(w, h);
+        champlain_marker.set_translation(-w * MapWidget.MARKER_IMAGE_HORIZONTAL_PIN_RATIO,
+                                         -h * MapWidget.MARKER_IMAGE_VERTICAL_PIN_RATIO, 0);
+    }
+
+    public Champlain.Marker champlain_marker { get; protected set; }
+
+    public bool highlighted {
+        get {
+            return _highlighted;
+        }
+        set {
+            if (_highlighted == value)
+                return;
+            _highlighted = value;
+            var base_image = _selected ? image_set.marker_selected_image : image_set.marker_image;
+            champlain_marker.set_content(value ? image_set.marker_highlighted_image : base_image);
+        }
+    }
+    public bool selected {
+        get {
+            return _selected;
+        }
+        set {
+            if (_selected == value)
+                return;
+            _selected = value;
+            if (!_highlighted) {
+                var base_image = value ?  image_set.marker_selected_image : image_set.marker_image;
+                champlain_marker.set_content(base_image);
+            }
+            champlain_marker.set_selected(value);
+        }
+    }
+}
+
+private class DataViewPositionMarker : PositionMarker {
+    private Gee.LinkedList<weak DataViewPositionMarker> _data_view_position_markers =
+            new Gee.LinkedList<weak DataViewPositionMarker>();
+
+    public weak DataView view { get; protected set; }
+
+    public DataViewPositionMarker(DataView view, Champlain.Marker champlain_marker,
+            MarkerImageSet image_set) {
+        base(champlain_marker, image_set);
+        this.view = view;
+
+        this._data_view_position_markers.add(this);
+    }
+
+    public void bind_mouse_events(MapWidget map_widget) {
+        champlain_marker.button_release_event.connect ((event) => {
+            if (event.button > 1)
+                return true;
+            bool mod = (bool)(event.modifier_state &
+                    (Clutter.ModifierType.CONTROL_MASK | Clutter.ModifierType.SHIFT_MASK));
+            SelectionAction action = SelectionAction.SET;
+            if (mod)
+                action = _selected ? SelectionAction.REMOVE : SelectionAction.ADD;
+            selected = (action != SelectionAction.REMOVE);
+            map_widget.select_data_views(_data_view_position_markers, action);
+            return true;
+        });
+        champlain_marker.enter_event.connect ((event) => {
+            highlighted = true;
+            map_widget.highlight_data_views(_data_view_position_markers);
+            return true;
+        });
+        champlain_marker.leave_event.connect ((event) => {
+            highlighted = false;
+            map_widget.unhighlight_data_views(_data_view_position_markers);
+            return true;
+        });
+    }
+}
+
+private class MarkerGroup : PositionMarker {
+    private Gee.Collection<weak DataViewPositionMarker> _data_view_position_markers =
+        new Gee.LinkedList<weak DataViewPositionMarker>();
+    private Gee.Collection<PositionMarker> _position_markers = new Gee.LinkedList<PositionMarker>();
+    private Champlain.BoundingBox bbox = new Champlain.BoundingBox();
+
+    public void bind_mouse_events(MapWidget map_widget) {
+        champlain_marker.button_release_event.connect ((event) => {
+            if (event.button > 1)
+                return true;
+            bool mod = (bool)(event.modifier_state &
+                    (Clutter.ModifierType.CONTROL_MASK | Clutter.ModifierType.SHIFT_MASK));
+            SelectionAction action = SelectionAction.SET;
+            if (mod)
+                action = _selected ? SelectionAction.REMOVE : SelectionAction.ADD;
+            selected = (action != SelectionAction.REMOVE);
+            foreach (var m in _data_view_position_markers) {
+                m.selected = _selected;
+            }
+            map_widget.select_data_views(_data_view_position_markers.read_only_view, action);
+            return true;
+        });
+        champlain_marker.enter_event.connect ((event) => {
+            highlighted = true;
+            map_widget.highlight_data_views(_data_view_position_markers.read_only_view);
+            return true;
+        });
+        champlain_marker.leave_event.connect ((event) => {
+            highlighted = false;
+            map_widget.unhighlight_data_views(_data_view_position_markers.read_only_view);
+            return true;
+        });
+    }
+
+    public Gee.Collection<PositionMarker> position_markers {
+        owned get { return _position_markers.read_only_view; }
+    }
+
+    public MarkerGroup(Champlain.Marker champlain_marker, MarkerImageSet image_set) {
+        base(champlain_marker, image_set);
+    }
+
+    public void add_position_marker(PositionMarker marker) {
+        var data_view_position_marker = marker as DataViewPositionMarker;
+        if (data_view_position_marker != null)
+            _data_view_position_markers.add(data_view_position_marker);
+        var new_champlain_marker = marker.champlain_marker;
+        bbox.extend(new_champlain_marker.latitude, new_champlain_marker.longitude);
+        double lat, lon;
+        bbox.get_center(out lat, out lon);
+        champlain_marker.set_location(lat, lon);
+        _position_markers.add(marker);
+    }
+}
+
+private class MarkerGroupRaster : Object {
+    private const long MARKER_GROUP_RASTER_WIDTH_PX = 30l;
+    private const long MARKER_GROUP_RASTER_HEIGHT_PX = 30l;
+
+    private weak MapWidget map_widget;
+    private weak Champlain.View map_view;
+    private weak Champlain.MarkerLayer marker_layer;
+
+    public bool is_empty {
+        get {
+            return position_markers.is_empty;
+        }
+    }
+
+    // position_markers_tree is a two-dimensional tree for grouping position
+    // markers indexed by x (outer tree) and y (inner tree) raster coordinates.
+    // It maps coordinates to the PositionMarker (DataViewMarker or MarkerGroup)
+    // corresponding to them.
+    // If either raster index keys are empty, there is no marker within the
+    // raster cell. If both exist there are two possibilities:
+    // (1) the value is a MarkerGroup which means that multiple markers are
+    // grouped together, or (2) the value is a PositionMarker (but not a
+    // MarkerGroup) which means that there is exactly one marker in the raster
+    // cell. The tree is recreated every time the zoom level changes.
+    private Gee.TreeMap<long, Gee.TreeMap<long, unowned PositionMarker?>?> position_markers_tree =
+        new Gee.TreeMap<long, Gee.TreeMap<long, unowned PositionMarker?>?>();
+    // The marker group's collection keeps track of and owns all PositionMarkers including the marker groups
+    private Gee.Map<DataView, unowned PositionMarker> data_view_map = new Gee.HashMap<DataView, unowned PositionMarker>();
+    private Gee.Set<PositionMarker> position_markers = new Gee.HashSet<PositionMarker>();
+
+    public MarkerGroupRaster(MapWidget map_widget, Champlain.View map_view, Champlain.MarkerLayer marker_layer) {
+        this.map_widget = map_widget;
+        this.map_view = map_view;
+        this.marker_layer = marker_layer;
+        map_widget.zoom_changed.connect(regroup);
+    }
+
+    public void clear() {
+        lock (position_markers) {
+            data_view_map.clear();
+            position_markers_tree.clear();
+            position_markers.clear();
+        }
+    }
+
+    public void clear_selection() {
+        lock (position_markers) {
+            foreach (PositionMarker m in position_markers) {
+                m.selected = false;
+            }
+        }
+    }
+
+    public unowned PositionMarker? find_position_marker(DataView data_view) {
+        if (!data_view_map.has_key(data_view))
+            return null;
+        unowned PositionMarker? m;
+        lock (position_markers) {
+            m = data_view_map.get(data_view);
+        }
+        return m;
+    }
+
+    public void rasterize_marker(PositionMarker position_marker, bool already_on_map=false) {
+        var data_view_position_marker = position_marker as DataViewPositionMarker;
+        var champlain_marker = position_marker.champlain_marker;
+        long x, y;
+
+        lock (position_markers) {
+            rasterize_coords(champlain_marker.longitude, champlain_marker.latitude, out x, out y);
+            var yg = position_markers_tree.get(x);
+            if (yg == null) {
+                yg = new Gee.TreeMap<long, unowned PositionMarker?>();
+                position_markers_tree.set(x, yg);
+            }
+            var cell = yg.get(y);
+            if (cell == null) {
+                // first marker in this raster cell
+                yg.set(y, position_marker);
+                position_markers.add(position_marker);
+                if (!already_on_map)
+                    marker_layer.add_marker(position_marker.champlain_marker);
+                if (data_view_position_marker != null)
+                    data_view_map.set(data_view_position_marker.view, position_marker);
+
+            } else {
+                var marker_group = cell as MarkerGroup;
+                if (marker_group == null) {
+                    // single marker already occupies raster cell: create new group
+                    GpsCoords rasterized_gps_coords = GpsCoords() {
+                        has_gps = 1,
+                        longitude = map_view.x_to_longitude(x),
+                        latitude = map_view.y_to_latitude(y)
+                    };
+                    marker_group = map_widget.create_marker_group(rasterized_gps_coords);
+                    marker_group.add_position_marker(cell);
+                    if (cell.selected) // group becomes selected if any contained marker is
+                        marker_group.selected = true;
+                    if (cell is DataViewPositionMarker)
+                        data_view_map.set(((DataViewPositionMarker) cell).view, marker_group);
+                    yg.set(y, marker_group);
+                    position_markers.add(marker_group);
+                    position_markers.remove(cell);
+                    marker_layer.add_marker(marker_group.champlain_marker);
+                    marker_layer.remove_marker(cell.champlain_marker);
+                }
+                // group already exists, add new marker to it
+                marker_group.add_position_marker(position_marker);
+                if (already_on_map)
+                    marker_layer.remove_marker(position_marker.champlain_marker);
+                if (data_view_position_marker != null)
+                    data_view_map.set(data_view_position_marker.view, marker_group);
+            }
+        }
+    }
+
+    private void rasterize_coords(double longitude, double latitude, out long x, out long y) {
+        x = (Math.lround(map_view.longitude_to_x(longitude) / MARKER_GROUP_RASTER_WIDTH_PX)) *
+            MARKER_GROUP_RASTER_WIDTH_PX + (MARKER_GROUP_RASTER_WIDTH_PX / 2);
+        y = (Math.lround(map_view.latitude_to_y(latitude) / MARKER_GROUP_RASTER_HEIGHT_PX)) *
+            MARKER_GROUP_RASTER_HEIGHT_PX + (MARKER_GROUP_RASTER_HEIGHT_PX / 2);
+    }
+
+    internal void regroup() {
+        lock (position_markers) {
+            var position_markers_current = (owned) position_markers;
+            position_markers = new Gee.HashSet<PositionMarker>();
+            position_markers_tree.clear();
+
+            foreach (var pm in position_markers_current) {
+                var marker_group = pm as MarkerGroup;
+                if (marker_group != null) {
+                    marker_layer.remove_marker(marker_group.champlain_marker);
+                    foreach (var position_marker in marker_group.position_markers) {
+                        rasterize_marker(position_marker, false);
+                    }
+                } else {
+                    rasterize_marker(pm, true);
+                }
+            }
+            position_markers_current = null;
+        }
+    }
+}
+
+private class MapWidget : Gtk.Bin {
+    private const string MAPBOX_API_TOKEN = "pk.eyJ1IjoiamVuc2dlb3JnIiwiYSI6ImNqZ3FtYmhrMTBkOW8yeHBlNG8xN3hlNTAifQ.ek7i8UHeNIlkKi10fhgFgg";
+    private const uint DEFAULT_ZOOM_LEVEL = 8;
+
+    private static MapWidget instance = null;
+    private bool hide_map = false;
+
+    private GtkChamplain.Embed gtk_champlain_widget = new GtkChamplain.Embed();
+    private Champlain.View map_view = null;
+    private Champlain.Scale map_scale = new Champlain.Scale();
+    private Champlain.MarkerLayer marker_layer = new Champlain.MarkerLayer();
+    public bool map_edit_lock { get; set; }
+    private MarkerGroupRaster marker_group_raster = null;
+    private Gee.Map<DataView, unowned DataViewPositionMarker> data_view_marker_cache =
+        new Gee.HashMap<DataView, unowned DataViewPositionMarker>();
+    private weak Page? page = null;
+    private Clutter.Image? map_edit_locked_image;
+    private Clutter.Image? map_edit_unlocked_image;
+    private Clutter.Actor map_edit_lock_button = new Clutter.Actor();
+    private uint position_markers_timeout = 0;
+
+    public const float MARKER_IMAGE_HORIZONTAL_PIN_RATIO = 0.5f;
+    public const float MARKER_IMAGE_VERTICAL_PIN_RATIO = 0.825f;
+    public float map_edit_lock_image_width { get; private set; }
+    public float map_edit_lock_image_height { get; private set; }
+    public MarkerImageSet marker_image_set { get; private set; }
+    public MarkerImageSet marker_group_image_set { get; private set; }
+    public const Clutter.Color marker_point_color = { 10, 10, 255, 192 };
+
+    public signal void zoom_changed();
+
+    private MapWidget() {
+        setup_map();
+        add(gtk_champlain_widget);
+    }
+
+    public static MapWidget get_instance() {
+        if (instance == null)
+            instance = new MapWidget();
+        return instance;
+    }
+
+    public override bool drag_motion(Gdk.DragContext context, int x, int y, uint time) {
+        if (!map_edit_lock)
+            map_view.stop_go_to();
+        else
+            Gdk.drag_status(context, 0, time);
+        return true;
+    }
+
+    public override void drag_data_received(Gdk.DragContext context, int x, int y,
+            Gtk.SelectionData selection_data, uint info, uint time) {
+        bool success = false;
+        Gee.List<MediaSource>? media = unserialize_media_sources(selection_data.get_data(),
+            selection_data.get_length());
+        if (media != null && media.size > 0) {
+            double lat = map_view.y_to_latitude(y);
+            double lon = map_view.x_to_longitude(x);
+            success = internal_drop_received(media, lat, lon);
+        }
+
+        Gtk.drag_finish(context, success, false, time);
+    }
+
+    public new void set_visible(bool visible) {
+        /* hides Gtk.Widget.set_visible */
+        hide_map = !visible;
+        base.set_visible(visible);
+    }
+
+    public override void show_all() {
+        if (!hide_map)
+            base.show_all();
+    }
+
+    public void set_page(Page page) {
+        bool page_changed = false;
+        if (this.page != page) {
+            this.page = page;
+            page_changed = true;
+            clear();
+        }
+        ViewCollection view_collection = page.get_view();
+        if (view_collection == null)
+            return;
+
+        if (page_changed) {
+            data_view_marker_cache.clear();
+            foreach (DataObject view in view_collection.get_all()) {
+                if (view is DataView)
+                    add_data_view((DataView) view);
+            }
+            show_position_markers();
+        }
+        // In any case, the selection did change..
+        var selected = view_collection.get_selected();
+        if (selected != null) {
+            marker_group_raster.clear_selection();
+            foreach (DataView v in view_collection.get_selected()) {
+
+                var position_marker = marker_group_raster.find_position_marker(v);
+                if (position_marker != null)
+                    position_marker.selected = true;
+                if (position_marker is MarkerGroup) {
+                    DataViewPositionMarker? m = data_view_marker_cache.get(v);
+                    if (m != null)
+                        m.selected = true;
+                }
+            }
+        }
+    }
+
+    public void clear() {
+        data_view_marker_cache.clear();
+        marker_layer.remove_all();
+        marker_group_raster.clear();
+    }
+
+    public void add_data_view(DataView view) {
+        DataSource view_source = view.get_source();
+        if (!(view_source is Positionable))
+            return;
+        Positionable p = (Positionable) view_source;
+        GpsCoords gps_coords = p.get_gps_coords();
+        if (gps_coords.has_gps <= 0)
+            return;
+        PositionMarker position_marker = create_position_marker(view);
+        marker_group_raster.rasterize_marker(position_marker);
+    }
+
+    public void show_position_markers() {
+        if (marker_group_raster.is_empty)
+            return;
+
+        map_view.stop_go_to();
+        double lat, lon;
+        var bbox = marker_layer.get_bounding_box();
+        var zoom_level = map_view.get_zoom_level();
+        var zoom_level_test = zoom_level < 2 ? 0 : zoom_level - 2;
+        bbox.get_center(out lat, out lon);
+
+        if (map_view.get_bounding_box_for_zoom_level(zoom_level_test).covers(lat, lon)) {
+            // Don't zoom in/out if target is in proximity
+            map_view.ensure_visible(bbox, true);
+        } else if (zoom_level >= DEFAULT_ZOOM_LEVEL) {
+            // zoom out to DEFAULT_ZOOM_LEVEL first, then move
+            map_view.set_zoom_level(DEFAULT_ZOOM_LEVEL);
+            map_view.ensure_visible(bbox, true);
+        } else {
+            // move first, then zoom in to DEFAULT_ZOOM_LEVEL
+            map_view.go_to(lat, lon);
+            // There seems to be a runtime issue with the animation_completed signal
+            // sig = map_view.animation_completed["go-to"].connect((v) => { ... }
+            // so we're using a timeout-based approach instead. It should be kept in sync with
+            // the animation time (500ms by default.)
+            if (position_markers_timeout > 0)
+                Source.remove(position_markers_timeout);
+            position_markers_timeout = Timeout.add(500, () => {
+                map_view.center_on(lat, lon); // ensure the timeout wasn't too fast
+                if (map_view.get_zoom_level() < DEFAULT_ZOOM_LEVEL)
+                    map_view.set_zoom_level(DEFAULT_ZOOM_LEVEL);
+                map_view.ensure_visible(bbox, true);
+                position_markers_timeout = 0;
+                return Source.REMOVE;
+            });
+        }
+    }
+
+    public void select_data_views(Gee.Collection<unowned DataViewPositionMarker> ms,
+            SelectionAction action = SelectionAction.SET) {
+        if (page == null)
+            return;
+
+        ViewCollection page_view = page.get_view();
+        if (page_view != null) {
+            Marker marked = page_view.start_marking();
+            foreach (var m in ms) {
+                if (m.view is CheckerboardItem) {
+                    marked.mark(m.view);
+                }
+            }
+            if (action == SelectionAction.REMOVE) {
+                page_view.unselect_marked(marked);
+            } else {
+                if (action == SelectionAction.SET)
+                    page_view.unselect_all();
+                page_view.select_marked(marked);
+            }
+        }
+    }
+
+    public void highlight_data_views(Gee.Collection<unowned DataViewPositionMarker> ms) {
+        if (page == null)
+            return;
+
+        bool did_adjust_view = false;
+        foreach (var m in ms) {
+            if (!(m.view is CheckerboardItem)) {
+                continue;
+            }
+
+            CheckerboardItem item = m.view as CheckerboardItem;
+
+            if (!did_adjust_view && page is CheckerboardPage) {
+                ((CheckerboardPage) page).scroll_to_item(item);
+                did_adjust_view = true;
+            }
+            item.brighten();
+        }
+    }
+
+    public void unhighlight_data_views(Gee.Collection<unowned DataViewPositionMarker> ms) {
+        if (page == null)
+            return;
+
+        foreach (var m in ms) {
+            if (m.view is CheckerboardItem) {
+                CheckerboardItem item = (CheckerboardItem) m.view;
+                item.unbrighten();
+            }
+        }
+    }
+
+    public void highlight_position_marker(DataView v) {
+        var position_marker = marker_group_raster.find_position_marker(v);
+        if (position_marker != null) {
+            position_marker.highlighted = true;
+        }
+    }
+
+    public void unhighlight_position_marker(DataView v) {
+        var position_marker = marker_group_raster.find_position_marker(v);
+        if (position_marker != null) {
+            position_marker.highlighted = false;
+        }
+    }
+
+    public void media_source_position_changed(Gee.List<MediaSource> media, GpsCoords gps_coords) {
+        if (page == null)
+            return;
+        var view_collection = page.get_view();
+        foreach (var source in media) {
+            var view = view_collection.get_view_for_source(source);
+            if (view == null)
+                continue;
+            var marker = data_view_marker_cache.get(view);
+            if (marker != null) {
+                if (gps_coords.has_gps > 0) {
+                    // update individual marker cache
+                    marker.champlain_marker.set_location(gps_coords.latitude, gps_coords.longitude);
+                } else {
+                    // TODO: position removal not supported by GUI
+                    // remove marker from cache, map_layer
+                    // remove from marker_group_raster (needs a removal method which also removes the
+                    // item from the group if (marker_group_raster.find_position_marker(view) is MarkerGroup)
+                }
+            }
+        }
+        marker_group_raster.regroup();
+    }
+
+    private Champlain.MapSource create_map_source() {
+        var map_source = new Champlain.MapSourceChain();
+        var file_cache = new Champlain.FileCache.full(10 * 1024 * 1024,
+            AppDirs.get_cache_dir().get_child("tiles").get_child("mapbox-outdoors").get_path(),
+            new Champlain.ImageRenderer());
+        var memory_cache = new Champlain.MemoryCache.full(10 * 1024 * 1024, new Champlain.ImageRenderer());
+        var error_source = new Champlain.NullTileSource.full(new Champlain.ImageRenderer());
+
+        var tile_source = new Champlain.NetworkTileSource.full("mapbox-outdoors",
+                                                               "Mapbox outdoors tiles",
+                                                               "",
+                                                               "",
+                                                               0,
+                                                               19,
+                                                               512,
+                                                               Champlain.MapProjection.MERCATOR,
+                                                               "https://api.mapbox.com/styles/v1/mapbox/outdoors-v11/tiles/#Z#/#X#/#Y#?access_token=" +
+                                                               MAPBOX_API_TOKEN,
+                                                               new Champlain.ImageRenderer());
+
+        var user_agent = "Shotwell/%s libchamplain/%s".printf(_VERSION, Champlain.VERSION_S);
+        tile_source.set_user_agent(user_agent);
+        tile_source.max_conns = 2;
+
+        map_source.push(error_source);
+        map_source.push(tile_source);
+        map_source.push(file_cache);
+        map_source.push(memory_cache);
+
+        return map_source;
+    }
+
+    private Clutter.Actor create_attribution_actor() {
+        const string IMPROVE_TEXT = N_("Improve this map");
+        var label = new Gtk.Label(null);
+        label.set_markup("<a href=\"https://www.mapbox.com/about/maps/\">© Mapbox</a> <a href=\"https://openstreetmap.org/about/\">© OpenStreetMap</a> <a href=\"https://www.mapbox.com/map-feedback/\">%s</a>".printf(IMPROVE_TEXT));
+        label.get_style_context().add_class("map-attribution");
+
+        return new GtkClutter.Actor.with_contents(label);
+    }
+
+    private void setup_map() {
+        map_view = gtk_champlain_widget.get_view();
+        map_view.add_layer(marker_layer);
+        map_view.set_map_source(create_map_source());
+
+        var map_attribution_text = create_attribution_actor();
+        map_attribution_text.content_gravity = Clutter.ContentGravity.BOTTOM_RIGHT;
+        map_attribution_text.set_x_align(Clutter.ActorAlign.END);
+        map_attribution_text.set_x_expand(true);
+        map_attribution_text.set_y_align(Clutter.ActorAlign.END);
+        map_attribution_text.set_y_expand(true);
+
+        // add lock/unlock button to top left corner of map
+        map_edit_lock_button.content_gravity = Clutter.ContentGravity.TOP_RIGHT;
+        map_edit_lock_button.reactive = true;
+        map_edit_lock_button.set_x_align(Clutter.ActorAlign.END);
+        map_edit_lock_button.set_x_expand(true);
+        map_edit_lock_button.set_y_align(Clutter.ActorAlign.START);
+        map_edit_lock_button.set_y_expand(true);
+
+        map_edit_lock_button.button_release_event.connect((a, e) => {
+            if (e.button != 1 /* CLUTTER_BUTTON_PRIMARY */)
+                return false;
+            map_edit_lock = !map_edit_lock;
+            map_edit_lock_button.set_content(map_edit_lock ?
+                map_edit_locked_image : map_edit_unlocked_image);
+            return true;
+        });
+        map_view.add_child(map_edit_lock_button);
+        map_view.add_child(map_attribution_text);
+
+        gtk_champlain_widget.has_tooltip = true;
+        gtk_champlain_widget.query_tooltip.connect((x, y, keyboard_tooltip, tooltip) => {
+            Gdk.Rectangle lock_rect = {
+                (int) map_edit_lock_button.x,
+                (int) map_edit_lock_button.y,
+                (int) map_edit_lock_button.width,
+                (int) map_edit_lock_button.height,
+            };
+            Gdk.Rectangle mouse_pos = { x, y, 1, 1 };
+            if (!lock_rect.intersect(mouse_pos, null))
+                return false;
+            tooltip.set_text(_("Lock or unlock map for geotagging by dragging pictures onto the map"));
+            return true;
+        });
+
+        // add scale to bottom left corner of the map
+        map_scale.content_gravity = Clutter.ContentGravity.BOTTOM_LEFT;
+        map_scale.connect_view(map_view);
+        map_scale.set_x_align(Clutter.ActorAlign.START);
+        map_scale.set_x_expand(true);
+        map_scale.set_y_align(Clutter.ActorAlign.END);
+        map_scale.set_y_expand(true);
+        map_view.add_child(map_scale);
+
+        map_view.set_zoom_on_double_click(false);
+        map_view.notify.connect((o, p) => {
+            if (p.name == "zoom-level")
+                zoom_changed();
+        });
+
+        Gtk.TargetEntry[] dnd_targets = {
+            LibraryWindow.DND_TARGET_ENTRIES[LibraryWindow.TargetType.URI_LIST],
+            LibraryWindow.DND_TARGET_ENTRIES[LibraryWindow.TargetType.MEDIA_LIST]
+        };
+        Gtk.drag_dest_set(this, Gtk.DestDefaults.ALL, dnd_targets,
+            Gdk.DragAction.COPY | Gdk.DragAction.LINK | Gdk.DragAction.ASK);
+        button_press_event.connect(map_zoom_handler);
+        set_size_request(200, 200);
+
+        marker_group_raster = new MarkerGroupRaster(this, map_view, marker_layer);
+
+        // Load icons
+        float w, h;
+        marker_image_set = new MarkerImageSet();
+        marker_group_image_set = new MarkerImageSet();
+        marker_image_set.marker_image = Resources.get_icon_as_clutter_image(
+                Resources.ICON_GPS_MARKER, out w, out h);
+        marker_image_set.marker_image_width = w;
+        marker_image_set.marker_image_height = h;
+        marker_image_set.marker_selected_image = Resources.get_icon_as_clutter_image(
+                Resources.ICON_GPS_MARKER_SELECTED, out w, out h);
+        marker_image_set.marker_highlighted_image = Resources.get_icon_as_clutter_image(
+                Resources.ICON_GPS_MARKER_HIGHLIGHTED, out w, out h);
+
+        marker_group_image_set.marker_image = Resources.get_icon_as_clutter_image(
+                Resources.ICON_GPS_GROUP_MARKER, out w, out h);
+        marker_group_image_set.marker_image_width = w;
+        marker_group_image_set.marker_image_height = h;
+        marker_group_image_set.marker_selected_image = Resources.get_icon_as_clutter_image(
+                Resources.ICON_GPS_GROUP_MARKER_SELECTED, out w, out h);
+        marker_group_image_set.marker_highlighted_image = Resources.get_icon_as_clutter_image(
+                Resources.ICON_GPS_GROUP_MARKER_HIGHLIGHTED, out w, out h);
+
+        map_edit_locked_image = Resources.get_icon_as_clutter_image(
+                Resources.ICON_MAP_EDIT_LOCKED, out w, out h);
+        map_edit_unlocked_image = Resources.get_icon_as_clutter_image(
+                Resources.ICON_MAP_EDIT_UNLOCKED, out w, out h);
+        map_edit_lock_image_width = w;
+        map_edit_lock_image_height = h;
+        if (map_edit_locked_image == null) {
+            warning("Couldn't load map edit lock image");
+        } else {
+            map_edit_lock_button.set_content(map_edit_locked_image);
+            map_edit_lock_button.set_size(map_edit_lock_image_width, map_edit_lock_image_height);
+            map_edit_lock = true;
+        }
+    }
+
+    private Champlain.Marker create_champlain_marker(GpsCoords gps_coords) {
+        assert(gps_coords.has_gps > 0);
+
+        Champlain.Marker champlain_marker;
+        champlain_marker = new Champlain.Marker();
+        champlain_marker.set_pivot_point(0.5f, 0.5f); // set center of marker
+        champlain_marker.set_location(gps_coords.latitude, gps_coords.longitude);
+        return champlain_marker;
+    }
+
+    private DataViewPositionMarker create_position_marker(DataView view) {
+        var position_marker = data_view_marker_cache.get(view);
+        if (position_marker != null)
+            return position_marker;
+        DataSource data_source = view.get_source();
+        Positionable p = (Positionable) data_source;
+        GpsCoords gps_coords = p.get_gps_coords();
+        Champlain.Marker champlain_marker = create_champlain_marker(gps_coords);
+        position_marker = new DataViewPositionMarker(view, champlain_marker, marker_image_set);
+        position_marker.bind_mouse_events(this);
+        data_view_marker_cache.set(view, position_marker);
+        return (owned) position_marker;
+    }
+
+    internal MarkerGroup create_marker_group(GpsCoords gps_coords) {
+        Champlain.Marker champlain_marker = create_champlain_marker(gps_coords);
+        var g = new MarkerGroup(champlain_marker, marker_group_image_set);
+        g.bind_mouse_events(this);
+        return (owned) g;
+    }
+
+    private bool map_zoom_handler(Gdk.EventButton event) {
+        if (event.type == Gdk.EventType.2BUTTON_PRESS) {
+            if (event.button == 1 || event.button == 3) {
+                double lat = map_view.y_to_latitude(event.y);
+                double lon = map_view.x_to_longitude(event.x);
+                if (event.button == 1) {
+                    map_view.zoom_in();
+                } else {
+                    map_view.zoom_out();
+                }
+                map_view.center_on(lat, lon);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private bool internal_drop_received(Gee.List<MediaSource> media, double lat, double lon) {
+        if (map_edit_lock)
+            return false;
+
+        bool success = false;
+        GpsCoords gps_coords = GpsCoords() {
+            has_gps = 1,
+            latitude = lat,
+            longitude = lon
+        };
+        foreach (var m in media) {
+            Positionable p = m as Positionable;
+            if (p != null) {
+                p.set_gps_coords(gps_coords);
+                success = true;
+            }
+        }
+        media_source_position_changed(media, gps_coords);
+        return success;
+    }
+}