refactor: analysis

Author: Gordon Hayes

section_2/built_in_explicit_animations/analysis_options.yaml

@@ -0,0 +1,10 @@
+include: package:very_good_analysis/analysis_options.yaml
+
+analyzer:
+  strong-mode:
+    implicit-casts: false
+    implicit-dynamic: false
+
+linter:
+  rules:
+    public_member_api_docs: false

section_2/built_in_explicit_animations/lib/main.dart

@@ -6,23 +6,25 @@ import 'package:transition_widgets_example/transitions.dart/rotate_and_scale_tra
 import 'package:transition_widgets_example/transitions.dart/scale_transition.dart';
 import 'package:transition_widgets_example/transitions.dart/slide_transition.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
+  const MyApp({Key key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
       title: 'Transition Examples',
       theme: theme,
       home: Scaffold(
         appBar: AppBar(
-          title: Text('Transitions'),
+          title: const Text('Transitions'),
         ),
         body: Center(
           child: SlideTransitionExample(
             child: Column(
               mainAxisAlignment: MainAxisAlignment.spaceAround,
-              children: <Widget>[
+              children: const <Widget>[
                 AlignTransitionExample(),
                 RotateAndScaleTransitionExample(),
                 FadeTransitionExample(),

section_2/built_in_explicit_animations/lib/transitions.dart/align_transition.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:transition_widgets_example/styles.dart';
 
 class AlignTransitionExample extends StatefulWidget {
-  AlignTransitionExample({Key key}) : super(key: key);
+  const AlignTransitionExample({Key key}) : super(key: key);
 
   @override
   _AlignTransitionExampleState createState() => _AlignTransitionExampleState();
@@ -17,7 +17,7 @@ class _AlignTransitionExampleState extends State<AlignTransitionExample>
   void initState() {
     _controller = AnimationController(
       vsync: this,
-      duration: Duration(seconds: 2),
+      duration: const Duration(seconds: 2),
     );
     _animation = Tween<AlignmentGeometry>(
             begin: Alignment.topLeft, end: Alignment.topRight)
@@ -38,10 +38,16 @@ class _AlignTransitionExampleState extends State<AlignTransitionExample>
     return AlignTransition(
       alignment: _animation,
       child: Container(
-          color: salmon,
-          width: 100,
-          height: 100,
-          child: Center(child: Text('Align', style: TextStyle(fontSize: 24)))),
+        color: salmon,
+        width: 100,
+        height: 100,
+        child: const Center(
+          child: Text(
+            'Align',
+            style: TextStyle(fontSize: 24),
+          ),
+        ),
+      ),
     );
   }
 }

section_2/built_in_explicit_animations/lib/transitions.dart/fade_transition.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 
 class FadeTransitionExample extends StatefulWidget {
-  FadeTransitionExample({Key key}) : super(key: key);
+  const FadeTransitionExample({Key key}) : super(key: key);
 
   @override
   _FadeTransitionExampleState createState() => _FadeTransitionExampleState();
@@ -17,9 +17,10 @@ class _FadeTransitionExampleState extends State<FadeTransitionExample>
   @override
   void initState() {
     _controller =
-        AnimationController(vsync: this, duration: Duration(seconds: 5));
-    _controller.repeat(reverse: true);
-    _controller.addStatusListener(_animationStatusListener);
+        AnimationController(vsync: this, duration: const Duration(seconds: 5));
+    _controller
+      ..repeat(reverse: true)
+      ..addStatusListener(_animationStatusListener);
     super.initState();
   }
 
@@ -51,15 +52,17 @@ class _FadeTransitionExampleState extends State<FadeTransitionExample>
         duration: const Duration(milliseconds: 300),
         transitionBuilder: (Widget child, Animation<double> animation) {
           return SlideTransition(
+            position: Tween<Offset>(
+              begin: const Offset(1, 0),
+              end: const Offset(0.0, 0),
+            ).animate(animation),
             child: child,
-            position: Tween<Offset>(begin: Offset(1, 0), end: Offset(0.0, 0))
-                .animate(animation),
           );
         },
         child: Text(
           _text,
           key: ValueKey<String>(_key),
-          style: Theme.of(context).textTheme.headline,
+          style: Theme.of(context).textTheme.headline5,
         ),
       ),
     );

section_2/built_in_explicit_animations/lib/transitions.dart/rotate_and_scale_transition.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:transition_widgets_example/styles.dart';
 
 class RotateAndScaleTransitionExample extends StatefulWidget {
-  RotateAndScaleTransitionExample({Key key}) : super(key: key);
+  const RotateAndScaleTransitionExample({Key key}) : super(key: key);
 
   @override
   _RotateAndScaleTransitionExampleState createState() =>
@@ -21,11 +21,11 @@ class _RotateAndScaleTransitionExampleState
   void initState() {
     _controller = AnimationController(
       vsync: this,
-      duration: Duration(seconds: 3),
+      duration: const Duration(seconds: 3),
     );
     _controller2 = AnimationController(
       vsync: this,
-      duration: Duration(seconds: 3),
+      duration: const Duration(seconds: 3),
     );
     _rotateAnimation = Tween<double>(begin: 0, end: 1).animate(
         CurvedAnimation(parent: _controller, curve: Curves.elasticOut));
@@ -52,7 +52,7 @@ class _RotateAndScaleTransitionExampleState
             color: mustard,
             width: 100,
             height: 100,
-            child: Center(
+            child: const Center(
               child: Text('Rotate', style: TextStyle(fontSize: 24)),
             )),
       ),

section_2/built_in_explicit_animations/lib/transitions.dart/scale_transition.dart

@@ -3,10 +3,12 @@ import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:transition_widgets_example/styles.dart';
 
 class ScaleTransitionExample extends HookWidget {
+  const ScaleTransitionExample({Key key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     final _controller = useAnimationController(
-      duration: Duration(seconds: 1),
+      duration: const Duration(seconds: 1),
       lowerBound: 0,
       upperBound: 1,
     );
@@ -31,7 +33,7 @@ class ScaleTransitionExample extends HookWidget {
           color: sunset,
           width: 100,
           height: 100,
-          child: Center(
+          child: const Center(
             child: Text(
               'Scale',
               style: TextStyle(fontSize: 24),

section_2/built_in_explicit_animations/lib/transitions.dart/slide_transition.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 
 class SlideTransitionExample extends StatefulWidget {
-  SlideTransitionExample({Key key, this.child}) : super(key: key);
+  const SlideTransitionExample({Key key, this.child}) : super(key: key);
 
   final Widget child;
 
@@ -18,11 +18,11 @@ class _SlideTransitionExampleState extends State<SlideTransitionExample>
   void initState() {
     _controller = AnimationController(
       vsync: this,
-      duration: Duration(seconds: 1),
+      duration: const Duration(seconds: 1),
     );
     _animation = Tween<Offset>(
-      begin: Offset(0, 1),
-      end: Offset(0, 0),
+      begin: const Offset(0, 1),
+      end: const Offset(0, 0),
     ).animate(
       CurvedAnimation(
         parent: _controller,