lesson 6 (TweenAnimationBuilder) completed!

lib/Screens/lecture6.dart

@@ -0,0 +1,65 @@
+// ignore_for_file: public_member_api_docs, sort_constructors_first
+import 'dart:math' as math;
+
+import 'package:flutter/material.dart';
+
+class Lecture6 extends StatefulWidget {
+  final String title;
+  const Lecture6({
+    Key? key,
+    required this.title,
+  }) : super(key: key);
+
+  @override
+  State<Lecture6> createState() => Lecture6State();
+}
+
+class Lecture6State extends State<Lecture6> {
+  Color color = getRandomColor();
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(widget.title),
+      ),
+      body: Center(
+        child: ClipPath(
+          clipper: CircleClipper(),
+          child: TweenAnimationBuilder(
+            builder: (context, Color? color, child) => ColorFiltered(
+                colorFilter: ColorFilter.mode(color!, BlendMode.srcATop),
+                child: child!),
+            duration: Duration(seconds: 1),
+            onEnd: () => setState(() {
+              color = getRandomColor();
+            }),
+            tween: ColorTween(begin: getRandomColor(), end: color),
+            child: Container(
+              color: Colors.blue,
+              width: MediaQuery.of(context).size.width,
+              height: MediaQuery.of(context).size.width,
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+Color getRandomColor() =>
+    Colors.primaries[math.Random().nextInt(Colors.primaries.length)];
+
+class CircleClipper extends CustomClipper<Path> {
+  @override
+  getClip(Size size) {
+    Path path = Path();
+    final rect = Rect.fromCircle(
+        center: Offset(size.width / 2, size.height / 2),
+        radius: size.width / 2);
+    path.addOval(rect);
+    return path;
+  }
+
+  @override
+  bool shouldReclip(covariant CustomClipper oldClipper) => true;
+}