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samples/material_3_demo/lib/main.dart

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3.7 KiB

// Copyright 2021 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:web_startup_analyzer/web_startup_analyzer.dart';
import 'constants.dart';
import 'home.dart';
void main() async {
var analyzer = WebStartupAnalyzer(additionalFrameCount: 10);
debugPrint(json.encode(analyzer.startupTiming));
analyzer.onFirstFrame.addListener(() {
debugPrint(json.encode({'firstFrame': analyzer.onFirstFrame.value}));
});
analyzer.onFirstPaint.addListener(() {
debugPrint(json.encode({
'firstPaint': analyzer.onFirstPaint.value?.$1,
'firstContentfulPaint': analyzer.onFirstPaint.value?.$2,
}));
});
analyzer.onAdditionalFrames.addListener(() {
debugPrint(json.encode({
'additionalFrames': analyzer.onAdditionalFrames.value,
}));
});
runApp(
const App(),
);
}
class App extends StatefulWidget {
const App({super.key});
@override
State<App> createState() => _AppState();
}
class _AppState extends State<App> {
bool useMaterial3 = true;
ThemeMode themeMode = ThemeMode.system;
ColorSeed colorSelected = ColorSeed.baseColor;
ColorImageProvider imageSelected = ColorImageProvider.leaves;
ColorScheme? imageColorScheme = const ColorScheme.light();
ColorSelectionMethod colorSelectionMethod = ColorSelectionMethod.colorSeed;
bool get useLightMode => switch (themeMode) {
ThemeMode.system =>
View.of(context).platformDispatcher.platformBrightness ==
Brightness.light,
ThemeMode.light => true,
ThemeMode.dark => false
};
void handleBrightnessChange(bool useLightMode) {
setState(() {
themeMode = useLightMode ? ThemeMode.light : ThemeMode.dark;
});
}
void handleMaterialVersionChange() {
setState(() {
useMaterial3 = !useMaterial3;
});
}
void handleColorSelect(int value) {
setState(() {
colorSelectionMethod = ColorSelectionMethod.colorSeed;
colorSelected = ColorSeed.values[value];
});
}
void handleImageSelect(int value) {
final String url = ColorImageProvider.values[value].url;
ColorScheme.fromImageProvider(provider: NetworkImage(url))
.then((newScheme) {
setState(() {
colorSelectionMethod = ColorSelectionMethod.image;
imageSelected = ColorImageProvider.values[value];
imageColorScheme = newScheme;
});
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Material 3',
themeMode: themeMode,
theme: ThemeData(
colorSchemeSeed: colorSelectionMethod == ColorSelectionMethod.colorSeed
? colorSelected.color
: null,
colorScheme: colorSelectionMethod == ColorSelectionMethod.image
? imageColorScheme
: null,
useMaterial3: useMaterial3,
brightness: Brightness.light,
),
darkTheme: ThemeData(
colorSchemeSeed: colorSelectionMethod == ColorSelectionMethod.colorSeed
? colorSelected.color
: imageColorScheme!.primary,
useMaterial3: useMaterial3,
brightness: Brightness.dark,
),
home: Home(
useLightMode: useLightMode,
useMaterial3: useMaterial3,
colorSelected: colorSelected,
imageSelected: imageSelected,
handleBrightnessChange: handleBrightnessChange,
handleMaterialVersionChange: handleMaterialVersionChange,
handleColorSelect: handleColorSelect,
handleImageSelect: handleImageSelect,
colorSelectionMethod: colorSelectionMethod,
),
);
}
}