[gnome-maps/wip/mlundblad/auto-disable-aerial: 1/2] layersPopover: Disable switch button when aerial is unavailable

[Marcus Lundblad <mlundblad src gnome org>]

commit b7e250bed87428845bf37acf522acc56c9c5d202
Author: Marcus Lundblad <ml update uu se>
Date:   Thu Nov 9 22:31:31 2017 +0100

    layersPopover: Disable switch button when aerial is unavailable
    
    Don't show the layer switching buttons when aerial tiles are
    not available.

 src/layersPopover.js |   21 ++++++++++++++-------
 1 files changed, 14 insertions(+), 7 deletions(-)
---
diff --git a/src/layersPopover.js b/src/layersPopover.js
index a5c7fa3..02d9ac1 100644
--- a/src/layersPopover.js
+++ b/src/layersPopover.js
@@ -21,6 +21,7 @@ const Gtk = imports.gi.Gtk;
 const Lang = imports.lang;
 
 const MapView = imports.mapView;
+const Service = imports.service;
 const ShapeLayer = imports.shapeLayer;
 const Utils = imports.utils;
 
@@ -85,13 +86,19 @@ var LayersPopover = new Lang.Class({
             row.set_header(header);
         });
 
-        this._streetLayerButton.connect('clicked', (function () {
-            this._mapView.setMapType(MapView.MapType.STREET);
-        }).bind(this));
-
-        this._aerialLayerButton.connect('clicked', (function () {
-            this._mapView.setMapType(MapView.MapType.AERIAL);
-        }).bind(this));
+        // disable the map type switch buttons if aerial is unavailable
+        if (Service.getService().tiles.aerial) {
+            this._streetLayerButton.connect('clicked', (function () {
+                this._mapView.setMapType(MapView.MapType.STREET);
+            }).bind(this));
+
+            this._aerialLayerButton.connect('clicked', (function () {
+                this._mapView.setMapType(MapView.MapType.AERIAL);
+            }).bind(this));
+        } else {
+            this._streetLayerButton.visible = false;
+            this._aerialLayerButton.visible = false;
+        }
     },
 
     setMapType: function(mapType) {