feat: upgrade flutter to v3.0.0 and dart 2.17 to support "Super initializers" (#1355)

Author: Gustl22

packages/audioplayers/example/lib/components/btn.dart

@@ -4,8 +4,7 @@ class Btn extends StatelessWidget {
   final String txt;
   final VoidCallback onPressed;
 
-  const Btn({Key? key, required this.txt, required this.onPressed})
-      : super(key: key);
+  const Btn({super.key, required this.txt, required this.onPressed});
 
   @override
   Widget build(BuildContext context) {

packages/audioplayers/example/lib/components/cbx.dart

@@ -9,8 +9,8 @@ class Cbx extends StatelessWidget {
     this.label,
     this.value,
     this.update, {
-    Key? key,
-  }) : super(key: key);
+    super.key,
+  });
 
   @override
   Widget build(BuildContext context) {

packages/audioplayers/example/lib/components/dlg.dart

@@ -5,10 +5,10 @@ class SimpleDlg extends StatelessWidget {
   final String message, action;
 
   const SimpleDlg({
-    Key? key,
+    super.key,
     required this.message,
     required this.action,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {
@@ -28,9 +28,9 @@ class Dlg extends StatelessWidget {
   final List<Widget> children;
 
   const Dlg({
-    Key? key,
+    super.key,
     required this.children,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

packages/audioplayers/example/lib/components/pad.dart

@@ -3,7 +3,7 @@ import 'package:flutter/material.dart';
 class Pad extends StatelessWidget {
   final double width, height;
 
-  const Pad({Key? key, this.width = 0, this.height = 0}) : super(key: key);
+  const Pad({super.key, this.width = 0, this.height = 0});
 
   @override
   Widget build(BuildContext context) {

packages/audioplayers/example/lib/components/player_widget.dart

@@ -7,9 +7,9 @@ class PlayerWidget extends StatefulWidget {
   final AudioPlayer player;
 
   const PlayerWidget({
-    Key? key,
+    super.key,
     required this.player,
-  }) : super(key: key);
+  });
 
   @override
   State<StatefulWidget> createState() {

packages/audioplayers/example/lib/components/tab_wrapper.dart

@@ -3,7 +3,7 @@ import 'package:flutter/material.dart';
 class TabWrapper extends StatelessWidget {
   final List<Widget> children;
 
-  const TabWrapper({Key? key, required this.children}) : super(key: key);
+  const TabWrapper({super.key, required this.children});
 
   @override
   Widget build(BuildContext context) {

packages/audioplayers/example/lib/components/tabs.dart

@@ -3,7 +3,7 @@ import 'package:flutter/material.dart';
 class Tabs extends StatelessWidget {
   final List<TabData> tabs;
 
-  const Tabs({Key? key, required this.tabs}) : super(key: key);
+  const Tabs({super.key, required this.tabs});
 
   @override
   Widget build(BuildContext context) {

packages/audioplayers/example/lib/components/tgl.dart

@@ -7,11 +7,11 @@ class Tgl extends StatelessWidget {
   final void Function(int) onChange;
 
   const Tgl({
-    Key? key,
+    super.key,
     required this.options,
     required this.selected,
     required this.onChange,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {
@@ -38,11 +38,11 @@ class EnumTgl<T extends Enum> extends StatelessWidget {
   final void Function(T) onChange;
 
   const EnumTgl({
-    Key? key,
+    super.key,
     required this.options,
     required this.selected,
     required this.onChange,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

packages/audioplayers/example/lib/components/txt.dart

@@ -4,10 +4,10 @@ class TxtBox extends StatefulWidget {
   final String value;
   final void Function(String) onChange;
   const TxtBox({
-    Key? key,
+    super.key,
     required this.value,
     required this.onChange,
-  }) : super(key: key);
+  });
 
   @override
   State<TxtBox> createState() => _TxtBoxState();

packages/audioplayers/example/lib/main.dart

@@ -18,7 +18,7 @@ void main() {
 }
 
 class ExampleApp extends StatefulWidget {
-  const ExampleApp({Key? key}) : super(key: key);
+  const ExampleApp({super.key});
 
   @override
   _ExampleAppState createState() => _ExampleAppState();