128 lines
3.2 KiB
Dart
128 lines
3.2 KiB
Dart
import 'dart:async';
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import 'dart:math';
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import 'package:flutter/material.dart';
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/// Simple binary rain animation with a label for the update check splash.
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class UpdateCheckingScreen extends StatefulWidget {
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const UpdateCheckingScreen({super.key});
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@override
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State<UpdateCheckingScreen> createState() => _UpdateCheckingScreenState();
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}
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class _UpdateCheckingScreenState extends State<UpdateCheckingScreen> {
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static const int cols = 20;
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final List<_Drop> _drops = [];
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Timer? _timer;
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final Random _rng = Random();
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@override
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void initState() {
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super.initState();
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_timer = Timer.periodic(const Duration(milliseconds: 50), (_) {
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_tick();
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});
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}
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void _tick() {
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setState(() {
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if (_rng.nextDouble() < 0.3 || _drops.isEmpty) {
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_drops.add(
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_Drop(
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col: _rng.nextInt(cols),
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y: 0.0,
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speed: _rng.nextDouble() * 4 + 2,
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),
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);
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}
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_drops.removeWhere((d) => d.y > MediaQuery.of(context).size.height);
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for (final d in _drops) {
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d.y += d.speed;
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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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_timer?.cancel();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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final cs = Theme.of(context).colorScheme;
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return Scaffold(
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backgroundColor: cs.surface,
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body: SafeArea(
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child: Column(
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children: [
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const SizedBox(height: 40),
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Hero(
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tag: 'tasq-logo',
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child: Image.asset('assets/tasq_ico.png', height: 80, width: 80),
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),
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const SizedBox(height: 24),
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Expanded(
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child: CustomPaint(
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size: Size.infinite,
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painter: _BinaryRainPainter(_drops, cols, cs.primary),
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),
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),
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const SizedBox(height: 24),
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Text(
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'Checking for updates...',
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style: Theme.of(context).textTheme.titleMedium?.copyWith(
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color: cs.onSurface.withAlpha((0.75 * 255).round()),
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),
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),
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const SizedBox(height: 40),
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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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class _Drop {
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int col;
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double y;
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double speed;
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_Drop({required this.col, required this.y, required this.speed});
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}
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class _BinaryRainPainter extends CustomPainter {
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static const double fontSize = 16;
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final List<_Drop> drops;
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final int cols;
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final Color textColor;
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_BinaryRainPainter(this.drops, this.cols, this.textColor);
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@override
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void paint(Canvas canvas, Size size) {
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// paint variable not needed when drawing text
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final textStyle = TextStyle(
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color: textColor,
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fontSize: fontSize,
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fontFeatures: const [FontFeature.tabularFigures()],
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);
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final cellW = size.width / cols;
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for (final d in drops) {
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final text = (Random().nextBool() ? '1' : '0');
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final tp = TextPainter(
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text: TextSpan(text: text, style: textStyle),
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textAlign: TextAlign.center,
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textDirection: TextDirection.ltr,
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)..layout();
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final x = d.col * cellW + (cellW - tp.width) / 2;
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final y = d.y;
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tp.paint(canvas, Offset(x, y));
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}
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}
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@override
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bool shouldRepaint(covariant _BinaryRainPainter old) => true;
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}
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