Rename top level directories

mobile/lib/app.dart

@@ -0,0 +1,141 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+
+import 'backend.dart';
+import 'screens/home.dart';
+import 'widgets/player_bar.dart';
+
+class App extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final backend = Backend.of(context);
+
+    return MaterialApp(
+      title: 'Musicus',
+      theme: ThemeData(
+        brightness: Brightness.dark,
+        accentColor: Colors.amber,
+        textSelectionColor: Colors.grey[600],
+        cursorColor: Colors.amber,
+        textSelectionHandleColor: Colors.amber,
+        toggleableActiveColor: Colors.amber,
+        // Added for sliders and FABs. Not everything seems to obey this.
+        colorScheme: ColorScheme.dark(
+          primary: Colors.amber,
+          secondary: Colors.amber,
+        ),
+        fontFamily: 'Libertinus Sans',
+      ),
+      home: Builder(
+        builder: (context) {
+          if (backend.status == BackendStatus.loading) {
+            return Material(
+              color: Theme.of(context).scaffoldBackgroundColor,
+            );
+          } else if (backend.status == BackendStatus.setup) {
+            return Material(
+              color: Theme.of(context).scaffoldBackgroundColor,
+              child: Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: <Widget>[
+                  Text(
+                    'Choose the base path for\nyour music library.',
+                    textAlign: TextAlign.center,
+                    style: Theme.of(context).textTheme.headline6,
+                  ),
+                  SizedBox(
+                    height: 16.0,
+                  ),
+                  ListTile(
+                    leading: const Icon(Icons.folder_open),
+                    title: Text('Choose path'),
+                    onTap: () {
+                      backend.chooseMusicLibraryUri();
+                    },
+                  ),
+                ],
+              ),
+            );
+          } else {
+            return Content();
+          }
+        },
+      ),
+    );
+  }
+}
+
+class Content extends StatefulWidget {
+  @override
+  _ContentState createState() => _ContentState();
+}
+
+class _ContentState extends State<Content> with SingleTickerProviderStateMixin {
+  final nestedNavigator = GlobalKey<NavigatorState>();
+
+  AnimationController playerBarAnimation;
+  BackendState backend;
+  StreamSubscription<bool> playerActiveSubscription;
+
+  @override
+  void initState() {
+    super.initState();
+
+    playerBarAnimation = AnimationController(
+      vsync: this,
+      duration: Duration(milliseconds: 300),
+    );
+  }
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+
+    backend = Backend.of(context);
+    playerBarAnimation.value = backend.player.active.value ? 1.0 : 0.0;
+
+    if (playerActiveSubscription != null) {
+      playerActiveSubscription.cancel();
+    }
+
+    playerActiveSubscription = backend.player.active.listen((active) =>
+        active ? playerBarAnimation.forward() : playerBarAnimation.reverse());
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // The nested Navigator is for every screen from which the player bar at
+    // the bottom should be accessible. The WillPopScope widget intercepts
+    // taps on the system back button and redirects them to the nested
+    // navigator.
+    return WillPopScope(
+      onWillPop: () async => !(await nestedNavigator.currentState.maybePop()),
+      child: Scaffold(
+        body: Navigator(
+          key: nestedNavigator,
+          onGenerateRoute: (settings) => settings.name == '/'
+              ? MaterialPageRoute(
+                  builder: (context) => HomeScreen(),
+                )
+              : null,
+          initialRoute: '/',
+        ),
+        bottomNavigationBar: SizeTransition(
+          sizeFactor: CurvedAnimation(
+            curve: Curves.easeOut,
+            parent: playerBarAnimation,
+          ),
+          axisAlignment: -1.0,
+          child: PlayerBar(),
+        ),
+      ),
+    );
+  }
+
+  @override
+  void dispose() {
+    super.dispose();
+    playerActiveSubscription.cancel();
+  }
+}