settings: added info map zoom

lib/main.dart

@@ -2,12 +2,14 @@ import 'package:aves/model/image_collection.dart';
 import 'package:aves/model/image_entry.dart';
 import 'package:aves/model/image_file_service.dart';
 import 'package:aves/model/metadata_db.dart';
+import 'package:aves/model/settings.dart';
 import 'package:aves/widgets/album/all_collection_page.dart';
 import 'package:aves/widgets/common/fake_app_bar.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
-void main() {
+void main() async {
+  await settings.init();
   runApp(AvesApp());
 }
 

lib/model/settings.dart

@@ -0,0 +1,72 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+final Settings settings = Settings._private();
+
+typedef void SettingsCallback(String key, dynamic oldValue, dynamic newValue);
+
+class Settings {
+  static SharedPreferences prefs;
+
+  ObserverList<SettingsCallback> _listeners = ObserverList<SettingsCallback>();
+
+  Settings._private();
+
+  // preferences
+  static const infoMapZoomKey = 'info_map_zoom';
+
+  init() async {
+    prefs = await SharedPreferences.getInstance();
+  }
+
+  void addListener(SettingsCallback listener) => _listeners.add(listener);
+
+  void removeListener(SettingsCallback listener) => _listeners.remove(listener);
+
+  void notifyListeners(String key, dynamic oldValue, dynamic newValue) {
+    debugPrint('$runtimeType notifyListeners key=$key, old=$oldValue, new=$newValue');
+    if (_listeners != null) {
+      final List<SettingsCallback> localListeners = _listeners.toList();
+      for (SettingsCallback listener in localListeners) {
+        try {
+          if (_listeners.contains(listener)) {
+            listener(key, oldValue, newValue);
+          }
+        } catch (exception, stack) {
+          debugPrint('$runtimeType failed to notify listeners with exception=$exception\n$stack');
+        }
+      }
+    }
+  }
+
+  double get infoMapZoom => prefs.getDouble(infoMapZoomKey) ?? 12;
+
+  set infoMapZoom(double newValue) => setAndNotify(infoMapZoomKey, newValue);
+
+  // convenience methods
+
+  bool getBoolOrDefault(String key, bool defaultValue) => prefs.getKeys().contains(key) ? prefs.getBool(key) : defaultValue;
+
+  setAndNotify(String key, dynamic newValue) {
+    var oldValue = prefs.get(key);
+    if (newValue == null) {
+      prefs.remove(key);
+    } else if (newValue is String) {
+      oldValue = prefs.getString(key);
+      prefs.setString(key, newValue);
+    } else if (newValue is int) {
+      oldValue = prefs.getInt(key);
+      prefs.setInt(key, newValue);
+    } else if (newValue is double) {
+      oldValue = prefs.getDouble(key);
+      prefs.setDouble(key, newValue);
+    } else if (newValue is bool) {
+      oldValue = prefs.getBool(key);
+      prefs.setBool(key, newValue);
+    }
+    if (oldValue != newValue) {
+      notifyListeners(key, oldValue, newValue);
+    }
+  }
+}

lib/widgets/fullscreen/info/location_section.dart

@@ -1,4 +1,5 @@
 import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/settings.dart';
 import 'package:aves/utils/android_app_service.dart';
 import 'package:aves/widgets/fullscreen/info/info_page.dart';
 import 'package:flutter/material.dart';
@@ -24,8 +25,7 @@ class LocationSection extends AnimatedWidget {
                   entry.latLng.item2,
                 ),
                 geoUri: entry.geoUri,
-                // TODO TLAD read preferences/zoom
+                initialZoom: settings.infoMapZoom,
-                initialZoom: 12,
               ),
               if (entry.isLocated)
                 Padding(
@@ -113,7 +113,7 @@ class ImageMapState extends State<ImageMap> with AutomaticKeepAliveClientMixin {
   }
 
   zoomBy(double amount) {
-    // TODO TLAD update preferences/zoom
+    settings.infoMapZoom += amount;
     controller.animateCamera(CameraUpdate.zoomBy(amount));
   }
 

pubspec.lock

@@ -144,6 +144,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.0.5"
+  shared_preferences:
+    dependency: "direct main"
+    description:
+      name: shared_preferences
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.5.3+4"
   sky_engine:
     dependency: transitive
     description: flutter

pubspec.yaml

@@ -29,6 +29,7 @@ dependencies:
   path:
   photo_view:
   screen:
+  shared_preferences:
   sqflite:
   transparent_image:
   tuple: