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// Copyright 2019-present the Flutter authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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// Computes the nth number in the Fibonacci sequence.
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int fib(int n) {
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var a = n - 1;
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var b = n - 2;
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if (n == 1) {
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return 0;
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} else if (n == 0) {
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return 1;
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} else {
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return (fib(a) + fib(b));
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}
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}
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class PerformancePage extends StatefulWidget {
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@override
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_PerformancePageState createState() => _PerformancePageState();
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}
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class _PerformancePageState extends State<PerformancePage> {
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Future<void> computeFuture = Future.value();
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@override
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Widget build(BuildContext context) {
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return Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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SmoothAnimationWidget(),
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Container(
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alignment: Alignment.bottomCenter,
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padding: EdgeInsets.only(top: 150),
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child: Column(
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children: [
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FutureBuilder(
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future: computeFuture,
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builder: (context, snapshot) {
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return ElevatedButton(
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child: const Text('Compute on Main'),
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style: ElevatedButton.styleFrom(elevation: 8.0),
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onPressed:
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snapshot.connectionState == ConnectionState.done
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? () => handleComputeOnMain(context)
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: null,
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);
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},
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),
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FutureBuilder(
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future: computeFuture,
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builder: (context, snapshot) {
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return ElevatedButton(
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child: const Text('Compute on Secondary'),
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style: ElevatedButton.styleFrom(elevation: 8.0),
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onPressed:
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snapshot.connectionState == ConnectionState.done
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? () => handleComputeOnSecondary(context)
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: null);
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},
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),
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],
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),
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),
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],
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),
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);
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}
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void handleComputeOnMain(BuildContext context) {
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var future = computeOnMainIsolate()
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..then((_) {
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var snackBar = SnackBar(
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content: Text('Main Isolate Done!'),
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);
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Scaffold.of(context).showSnackBar(snackBar);
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});
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setState(() {
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computeFuture = future;
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});
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}
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void handleComputeOnSecondary(BuildContext context) {
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var future = computeOnSecondaryIsolate()
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..then((_) {
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var snackBar = SnackBar(
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content: Text('Secondary Isolate Done!'),
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);
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Scaffold.of(context).showSnackBar(snackBar);
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});
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setState(() {
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computeFuture = future;
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});
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}
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Future<void> computeOnMainIsolate() async {
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// A delay is added here to give Flutter the chance to redraw the UI at
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// least once before the computation (which, since it's run on the main
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// isolate, will lock up the app) begins executing.
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await Future<void>.delayed(Duration(milliseconds: 100));
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fib(45);
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}
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Future<void> computeOnSecondaryIsolate() async {
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// Compute the Fibonacci series on a secondary isolate.
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await compute(fib, 45);
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}
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}
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class SmoothAnimationWidget extends StatefulWidget {
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@override
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SmoothAnimationWidgetState createState() => SmoothAnimationWidgetState();
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}
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class SmoothAnimationWidgetState extends State<SmoothAnimationWidget>
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with TickerProviderStateMixin {
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AnimationController _animationController;
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Animation<BorderRadius> _borderAnimation;
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@override
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void initState() {
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super.initState();
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_animationController =
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AnimationController(duration: const Duration(seconds: 1), vsync: this);
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_borderAnimation = BorderRadiusTween(
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begin: BorderRadius.circular(100.0),
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end: BorderRadius.circular(0.0))
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.animate(_animationController);
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_animationController.repeat(reverse: true);
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}
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@override
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Widget build(BuildContext context) {
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return Center(
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child: AnimatedBuilder(
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animation: _borderAnimation,
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builder: (context, child) {
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return Container(
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child: FlutterLogo(
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size: 200,
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),
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alignment: Alignment.bottomCenter,
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width: 350,
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height: 200,
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decoration: BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.topLeft,
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colors: [
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Colors.blueAccent,
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Colors.redAccent,
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],
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),
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borderRadius: _borderAnimation.value,
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),
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);
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},
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),
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);
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}
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@override
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void dispose() {
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_animationController.dispose();
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super.dispose();
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}
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}
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