From f91fe8f2163ef6f382ab70804ccc84a58cfca43e Mon Sep 17 00:00:00 2001
From: kilowatt <notabug@pmmlabs.ru>
Date: Sat, 31 Oct 2020 23:52:23 +0300
Subject: [PATCH] Android TV support

---
 .gitignore                               |   2 +-
 android/app/src/main/AndroidManifest.xml |   9 ++
 lib/main.dart                            | 137 ++++++++++++++++-------
 lib/ui/home_screen.dart                  | 109 ++++++++----------
 lib/ui/login_screen.dart                 |  33 +++++-
 lib/ui/player_bar.dart                   |   5 +-
 lib/ui/player_screen.dart                |   1 +
 7 files changed, 184 insertions(+), 112 deletions(-)

diff --git a/.gitignore b/.gitignore
index 599cfa6..1e1d49c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,7 +35,7 @@ android/local.properties
 .pub-cache/
 .pub/
 /build/
-.gradle
+.gradle/
 
 # Web related
 lib/generated_plugin_registrant.dart
diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index 15fd683..edb9c02 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -14,6 +14,7 @@
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-feature android:name="android.software.LEANBACK" android:required="true"/>
 
     <application
         android:name="io.flutter.app.FlutterApplication"
@@ -34,6 +35,9 @@
             android:hardwareAccelerated="true"
             android:launchMode="singleTop"
             android:theme="@style/LaunchTheme"
+            android:banner="@mipmap/ic_launcher"
+            android:icon="@mipmap/ic_launcher"
+            android:logo="@mipmap/ic_launcher"
             android:windowSoftInputMode="adjustResize">
 
             <!--
@@ -89,6 +93,11 @@
                     android:scheme="https"
                     android:host="deezer.page.link" />
             </intent-filter>
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
+            </intent-filter>
         </activity>
         <!--
  Don't delete the meta-data below.
diff --git a/lib/main.dart b/lib/main.dart
index 996fc8c..3231440 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -84,6 +84,10 @@ class _FreezerAppState extends State<FreezerApp> {
   Widget build(BuildContext context) {
     return MaterialApp(
       title: 'Freezer',
+      shortcuts: <LogicalKeySet, Intent>{
+        ...WidgetsApp.defaultShortcuts,
+        LogicalKeySet(LogicalKeyboardKey.select): const ActivateIntent(), // DPAD center key, for remote controls
+      },
       theme: settings.themeData,
       localizationsDelegates: [
         GlobalMaterialLocalizations.delegate,
@@ -163,6 +167,7 @@ class _MainScreenState extends State<MainScreen> with SingleTickerProviderStateM
   List<Widget> _screens = [HomeScreen(), SearchScreen(), LibraryScreen()];
   int _selected = 0;
   StreamSubscription _urlLinkStream;
+  int _keyPressed = 0;
 
   @override
   void initState() {
@@ -237,49 +242,103 @@ class _MainScreenState extends State<MainScreen> with SingleTickerProviderStateM
     } catch (e) {}
   }
 
+  ValueChanged<RawKeyEvent> _handleKey(FocusScopeNode navigatorFocusNode, FocusNode rootFocusNode){
+    return (event) {
+      if (event.runtimeType.toString() == 'RawKeyDownEvent') {
+        int keyCode = (event.data as RawKeyEventDataAndroid).keyCode;
+        // Movement to navigation bar and back
+        switch (keyCode) {
+          case 127: // Menu on Android TV
+          case 327: // EPG on Hisense TV
+            navigatorFocusNode.requestFocus();
+            navigatorFocusNode.focusInDirection(TraversalDirection.down);
+            break;
+          case 22: // LEFT + RIGHT
+          case 21:
+            if (_keyPressed == 21 && keyCode == 22 || _keyPressed == 22 && keyCode == 21) {
+              navigatorFocusNode.requestFocus();
+              navigatorFocusNode.focusInDirection(TraversalDirection.down);
+            }
+            _keyPressed = keyCode;
+            Future.delayed(Duration(milliseconds: 100), () =>  {
+              _keyPressed = 0
+            });
+            break;
+          case 19: // UP
+            if (navigatorFocusNode.hasFocus) {
+              rootFocusNode.focusInDirection(TraversalDirection.up);
+            }
+            if (navigatorFocusNode.parent.hasPrimaryFocus || navigatorFocusNode.parent.parent.hasPrimaryFocus) {
+              navigatorFocusNode.parent.children.first.children.first.requestFocus();
+            }
+            break;
+        }
+      }
+      // WA for returning from search: focus on first child if parent is focused
+      if (event.runtimeType.toString() == 'RawKeyUpEvent') {
+        LogicalKeyboardKey key = event.data.logicalKey;
+        var modalFocusNode = navigatorFocusNode.parent.parent.children.first.children.first
+            .children.first;
+        if (key == LogicalKeyboardKey.arrowRight && modalFocusNode.hasPrimaryFocus) {
+          modalFocusNode.unfocus();
+          modalFocusNode.focusInDirection(TraversalDirection.right);
+        }
+      }
+    };
+  }
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      bottomNavigationBar: Column(
-        mainAxisSize: MainAxisSize.min,
-        children: <Widget>[
-          PlayerBar(),
-          BottomNavigationBar(
-            backgroundColor: Theme.of(context).bottomAppBarColor,
-            currentIndex: _selected,
-            onTap: (int s) async {
+    FocusScopeNode navigatorFocusNode = FocusScopeNode(); // for bottom navigator
+    FocusNode rootFocusNode = FocusNode();  // for Scaffold
+           
+    return RawKeyboardListener(
+        focusNode: rootFocusNode,
+        onKey: _handleKey(navigatorFocusNode, rootFocusNode),
+        child: Scaffold(
+            bottomNavigationBar:
+                FocusScope(
+                    node: navigatorFocusNode,
+                    child: Column(
+                      mainAxisSize: MainAxisSize.min,
+                      children: <Widget>[
+                        PlayerBar(),
+                        BottomNavigationBar(
+                          backgroundColor: Theme.of(context).bottomAppBarColor,
+                          currentIndex: _selected,
+                          onTap: (int s) async {
+                            //Pop all routes until home screen
+                            while (navigatorKey.currentState.canPop()) {
+                              await navigatorKey.currentState.maybePop();
+                            }
 
-              //Pop all routes until home screen
-              while (navigatorKey.currentState.canPop()) {
-                await navigatorKey.currentState.maybePop();
-              }
-
-              await navigatorKey.currentState.maybePop();
-              setState(() {
-                _selected = s;
-              });
-            },
-            selectedItemColor: Theme.of(context).primaryColor,
-            items: <BottomNavigationBarItem>[
-              BottomNavigationBarItem(
-                  icon: Icon(Icons.home), title: Text('Home'.i18n)),
-              BottomNavigationBarItem(
-                icon: Icon(Icons.search),
-                title: Text('Search'.i18n),
+                            await navigatorKey.currentState.maybePop();
+                            setState(() {
+                              _selected = s;
+                            });
+                          },
+                          selectedItemColor: Theme.of(context).primaryColor,
+                          items: <BottomNavigationBarItem>[
+                            BottomNavigationBarItem(
+                                icon: Icon(Icons.home),
+                                title: Text('Home'.i18n)),
+                            BottomNavigationBarItem(
+                              icon: Icon(Icons.search),
+                              title: Text('Search'.i18n),
+                            ),
+                            BottomNavigationBarItem(
+                                icon: Icon(Icons.library_music),
+                                title: Text('Library'.i18n))
+                          ],
+                        )
+                      ],
+                    )),
+            body: AudioServiceWidget(
+              child: CustomNavigator(
+                navigatorKey: navigatorKey,
+                home: _screens[_selected],
+                pageRoute: PageRoutes.materialPageRoute,
               ),
-              BottomNavigationBarItem(
-                  icon: Icon(Icons.library_music), title: Text('Library'.i18n))
-            ],
-          )
-        ],
-      ),
-      body: AudioServiceWidget(
-        child: CustomNavigator(
-          navigatorKey: navigatorKey,
-          home: _screens[_selected],
-          pageRoute: PageRoutes.materialPageRoute,
-        ),
-      ));
+            )));
   }
 }
diff --git a/lib/ui/home_screen.dart b/lib/ui/home_screen.dart
index ed4f15e..fe73789 100644
--- a/lib/ui/home_screen.dart
+++ b/lib/ui/home_screen.dart
@@ -143,79 +143,58 @@ class _HomePageScreenState extends State<HomePageScreen> {
       ));
     if (_error)
       return ErrorScreen();
-    return ListView.builder(
-      shrinkWrap: true,
-      physics: NeverScrollableScrollPhysics(),
-      itemCount: _homePage.sections.length,
-      itemBuilder: (context, i) {
-        return HomepageSectionWidget(_homePage.sections[i]);
-      },
-    );
-  }
-}
-
-class HomepageSectionWidget extends StatelessWidget {
-
-  final HomePageSection section;
-  HomepageSectionWidget(this.section);
-
-  @override
-  Widget build(BuildContext context) {
     return Column(
-      mainAxisSize: MainAxisSize.min,
-      crossAxisAlignment: CrossAxisAlignment.start,
-      children: [
-        Padding(
-            child: Text(
-              section.title,
+      children: List.generate(_homePage.sections.length, (i) {
+        HomePageSection section = _homePage.sections[i];
+        return ListTile(
+            title: Text(
+              section.title??'',
               textAlign: TextAlign.left,
               maxLines: 2,
               overflow: TextOverflow.ellipsis,
               style: TextStyle(
-                fontSize: 20.0,
-                fontWeight: FontWeight.w900
+                  fontSize: 20.0,
+                  fontWeight: FontWeight.w900
               ),
             ),
-            padding: EdgeInsets.symmetric(horizontal: 12.0, vertical: 8.0)
-        ),
-
-        SingleChildScrollView(
-          scrollDirection: Axis.horizontal,
-          child: Row(
-            children: List.generate(section.items.length + 1, (i) {
-              //Has more items
-              if (i == section.items.length) {
-                if (section.hasMore??false) {
-                  return FlatButton(
-                    child: Text(
-                      'Show more'.i18n,
-                      textAlign: TextAlign.center,
-                      style: TextStyle(
-                          fontSize: 20.0
-                      ),
-                    ),
-                    onPressed: () => Navigator.of(context).push(MaterialPageRoute(
-                      builder: (context) => Scaffold(
-                        appBar: FreezerAppBar(section.title),
-                        body: SingleChildScrollView(
-                          child: HomePageScreen(
-                            channel: DeezerChannel(target: section.pagePath)
-                          )
+            subtitle: SingleChildScrollView(
+              scrollDirection: Axis.horizontal,
+              child: Row(
+                children: List.generate(section.items.length + 1, (j) {
+                  //Has more items
+                  if (j == section.items.length) {
+                    if (section.hasMore ?? false) {
+                      return FlatButton(
+                        child: Text(
+                          'Show more'.i18n,
+                          textAlign: TextAlign.center,
+                          style: TextStyle(
+                              fontSize: 20.0
+                          ),
                         ),
-                      ),
-                    )),
-                  );
-                }
-                return Container(height: 0, width: 0);
-              }
-              //Show item
-              HomePageItem item = section.items[i];
-              return HomePageItemWidget(item);
-            }),
-          ),
-        ),
-        Container(height: 8.0),
-      ],
+                        onPressed: () => Navigator.of(context).push(MaterialPageRoute(
+                          builder: (context) => Scaffold(
+                            appBar: FreezerAppBar(section.title),
+                            body: SingleChildScrollView(
+                                child: HomePageScreen(
+                                  channel: DeezerChannel(target: section.pagePath)
+                                )
+                            ),
+                          ),
+                        )),
+                      );
+                    }
+                    return Container(height: 0, width: 0);
+                  }
+
+                  //Show item
+                  HomePageItem item = section.items[j];
+                  return HomePageItemWidget(item);
+                }),
+              ),
+            )
+        );
+      })
     );
   }
 }
diff --git a/lib/ui/login_screen.dart b/lib/ui/login_screen.dart
index 07e1212..069d807 100644
--- a/lib/ui/login_screen.dart
+++ b/lib/ui/login_screen.dart
@@ -1,5 +1,6 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:freezer/api/deezer.dart';
 import 'package:freezer/api/player.dart';
 import 'package:flutter_inappwebview/flutter_inappwebview.dart';
@@ -111,6 +112,17 @@ class _LoginWidgetState extends State<LoginWidget> {
     _start();
   }
 
+  // ARL auth: called on "Save" click, Enter and DPAD_Center press
+  void goARL(FocusNode node, TextEditingController _controller) {
+    if (node != null) {
+      node.unfocus();
+    }
+    _controller.clear();
+    settings.arl = _arl.trim();
+    Navigator.of(context).pop();
+    _update();
+  }
+
   @override
   Widget build(BuildContext context) {
 
@@ -121,7 +133,14 @@ class _LoginWidgetState extends State<LoginWidget> {
           child: CircularProgressIndicator(),
         ),
       );
-
+    TextEditingController _controller = new TextEditingController();
+    // For "DPAD center" key handling on remote controls
+    FocusNode focusNode = FocusNode(skipTraversal: true,descendantsAreFocusable: false,onKey: (node, event) {
+      if (event.logicalKey == LogicalKeyboardKey.select) {
+         goARL(node, _controller);
+      }
+      return true;
+    });
     if (settings.arl == null)
       return Scaffold(
         body: Padding(
@@ -165,6 +184,7 @@ class _LoginWidgetState extends State<LoginWidget> {
                     showDialog(
                         context: context,
                         builder: (context) {
+                          Future.delayed(Duration(seconds: 1), () => {focusNode.requestFocus()}); // autofocus doesn't work - it's replacement
                           return AlertDialog(
                             title: Text('Enter ARL'.i18n),
                             content: Container(
@@ -173,16 +193,17 @@ class _LoginWidgetState extends State<LoginWidget> {
                                 decoration: InputDecoration(
                                   labelText: 'Token (ARL)'.i18n
                                 ),
+                                focusNode: focusNode,
+                                controller: _controller,
+                                onSubmitted: (String s) {
+                                  goARL(focusNode, _controller);
+                                },
                               ),
                             ),
                             actions: <Widget>[
                               FlatButton(
                                 child: Text('Save'.i18n),
-                                onPressed: () {
-                                  settings.arl = _arl.trim();
-                                  Navigator.of(context).pop();
-                                  _update();
-                                },
+                                onPressed: () => goARL(null, _controller),
                               )
                             ],
                           );
diff --git a/lib/ui/player_bar.dart b/lib/ui/player_bar.dart
index 61cf65b..e99be5b 100644
--- a/lib/ui/player_bar.dart
+++ b/lib/ui/player_bar.dart
@@ -20,6 +20,7 @@ class PlayerBar extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    var focusNode = FocusNode();
     return GestureDetector(
       onHorizontalDragUpdate: (details) async {
         if (_gestureRegistered) return;
@@ -46,9 +47,11 @@ class PlayerBar extends StatelessWidget {
             mainAxisSize: MainAxisSize.min,
             children: <Widget>[
               Container(
-                color: Theme.of(context).bottomAppBarColor,
+                // For Android TV: indicate focus by grey
+                color: focusNode.hasFocus ? Colors.black26 : Theme.of(context).bottomAppBarColor,
                 child: ListTile(
                   dense: true,
+                  focusNode: focusNode,
                   contentPadding: EdgeInsets.symmetric(horizontal: 8.0),
                   onTap: () {
                     Navigator.of(context).push(MaterialPageRoute(
diff --git a/lib/ui/player_screen.dart b/lib/ui/player_screen.dart
index 0cd2648..29f0d18 100644
--- a/lib/ui/player_screen.dart
+++ b/lib/ui/player_screen.dart
@@ -628,6 +628,7 @@ class _SeekBarState extends State<SeekBar> {
             Container(
               height: 32.0,
               child: Slider(
+                focusNode: FocusNode(canRequestFocus: false, skipTraversal: true), // Don't focus on Slider - it doesn't work (and not needed)
                 value: position,
                 max: duration,
                 onChangeStart: (double d) {