From dfb7de4954c942e4cd1cd541f4c305a6c8367910 Mon Sep 17 00:00:00 2001
From: Marcus Lundblad <ml@dfupdate.se>
Date: Wed, 3 May 2023 21:28:34 +0200
Subject: mapView: Save and restore map rotation

Save map rotation and used stored value
when starting up.
---
 src/mapView.js | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/src/mapView.js b/src/mapView.js
index 537373a7..d4915c16 100644
--- a/src/mapView.js
+++ b/src/mapView.js
@@ -135,6 +135,7 @@ export class MapView extends Gtk.Overlay {
 
         this._mainWindow = mainWindow;
         this._storeId = 0;
+        this._storeRotationId = 0;
         this.map = this._initMap();
 
         this.child = this.map;
@@ -145,8 +146,10 @@ export class MapView extends Gtk.Overlay {
         this._initScale();
         this._initLayers();
 
-        if (Application.normalStartup)
+        if (Application.normalStartup) {
             this._goToStoredLocation();
+            this._setStoredRotation();
+        }
 
         this.shapeLayerStore = new Gio.ListStore(GObject.TYPE_OBJECT);
 
@@ -268,6 +271,7 @@ export class MapView extends Gtk.Overlay {
         map.viewport.min_zoom_level = MapMinZoom;
 
         map.viewport.connect('notify::latitude', this._onViewMoved.bind(this));
+        map.viewport.connect('notify::rotation', this._onViewRotated.bind(this));
         // switching map type will set view min-zoom-level from map source
         map.viewport.connect('notify::min-zoom-level', () => {
             if (map.viewport.min_zoom_level < MapMinZoom) {
@@ -694,6 +698,14 @@ export class MapView extends Gtk.Overlay {
         }
     }
 
+    _storeRotation() {
+        let viewport = this.map.viewport;
+        let rotation = viewport.rotation;
+
+        if (!isNaN(rotation))
+            Application.settings.set('rotation', rotation);
+    }
+
     _goToStoredLocation() {
         let location = Application.settings.get('last-viewed-location');
 
@@ -727,6 +739,18 @@ export class MapView extends Gtk.Overlay {
         }
     }
 
+    _setStoredRotation() {
+        let rotation = Application.settings.get('rotation');
+
+        if (rotation < 0.0 || rotation >= 2 * Math.PI) {
+            // safeguard agains out-of-bounds rotation values
+            Utils.debug('Invalid stored rotation, set no rotation');
+            rotation = 0;
+        }
+
+        this.map.viewport.rotation = rotation;
+    }
+
     gotoBBox(bbox, linear) {
         if (!bbox.isValid()) {
             Utils.debug('Bounding box is invalid');
@@ -958,6 +982,16 @@ export class MapView extends Gtk.Overlay {
         });
     }
 
+    _onViewRotated() {
+        if (this._storeRotationId !== 0)
+            return;
+
+        this._storeRotationId = GLib.timeout_add(null, _LOCATION_STORE_TIMEOUT, () => {
+            this._storeRotationId = 0;
+            this._storeRotation();
+        });
+    }
+
     onSetMarkerSelected(selectedMarker) {
         this.emit('marker-selected', selectedMarker);
     }
-- 
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