crizant’s gists

crizant / theme.dart

Last active May 12, 2021 09:27

Flutter: handle custom theme properties in different brightness by extension method

	import 'package:flutter/material.dart';

	extension CustomColorScheme on ColorScheme {
	Color get success => brightness == Brightness.light ? const Color(0xFF28a745) : const Color(0x2228a745);
	}

crizant / analysis_options.yaml

Created July 22, 2020 07:08

Flutter linting rules

	analyzer:
	errors:
	# treat missing required parameters as a warning (not a hint)
	missing_required_param: warning
	# treat missing returns as a warning (not a hint)
	missing_return: warning

	linter:
	rules:
	- always_declare_return_types

crizant / lefthook.yml

Last active November 16, 2020 02:08

Lefthook config file for flutter projects

	pre-commit:
	piped: true
	commands:
	linter:
	run: flutter analyze lib
	sort-imports:
	glob: "*.dart"
	run: flutter pub run import_sorter:main {staged_files} && git add {staged_files}
	pretty:
	glob: "*.dart"

crizant / example.dart

Created April 27, 2020 12:32

dart_map_enhancer example

	import 'package:map_enhancer/map_enhancer.dart';

	void main() {
	final Map peter = {
	'name': {
	'firstName': 'Peter',
	'lastName': 'Petrelli',
	},
	'age': 29,
	};

crizant / result.csv

Created March 2, 2020 12:37

Flutter const constructor analysis (memory usage)

Metric(Memory usage)\No. of logo	10	100	1000
Capacity(Use const constructor)	7.7MB	9.96MB	27.3MB
Used(Use const constructor)	4.4MB	4.3MB	16.8MB
Capacity(Use non-const constructor)	7.7MB	10.9MB	29.4MB
Used(Use non-const constructor)	4.3MB	5.4MB	22.1MB

crizant / result.csv

Created March 2, 2020 12:32

Flutter const constructor analysis (time to draw each frame)

Metric(Time to draw each frame)\No. of logo	10	100	1000
GPU (Use const constructor)	7.4ms	9.6ms	50ms
UI (Use const constructor)	4.8ms	10.6ms	78ms
GPU (Use non-const constructor)	7.4ms	9.6ms	56ms
UI (Use non-const constructor)	5.4ms	11.7ms	84.1ms

crizant / main.dart

Created February 19, 2020 06:30

Flutter listen for pointer scroll events

	Listener(
	onPointerSignal: (PointerSignalEvent event) {
	if (event is PointerScrollEvent) {
	print('x: ${event.position.dx}, y: ${event.position.dy}');
	print('scroll delta: ${event.scrollDelta}');
	}
	},
	child: child,
	)

crizant / main.dart

Last active February 19, 2020 06:30

Flutter listen for mouse movement events

	MouseRegion(
	onEnter: (PointerEnterEvent event) {
	print('x: ${event.position.dx}, y: ${event.position.dy}');
	},
	onHover: (PointerHoverEvent event) {
	print('x: ${event.position.dx}, y: ${event.position.dy}');
	},
	onExit: (PointerExitEvent event) {
	print('x: ${event.position.dx}, y: ${event.position.dy}');
	},

crizant / index.js

Created February 7, 2020 17:31

Node.js handle dynamoDb batch write limit

	const R = require('ramda')
	const aws = require('aws-sdk')
	const batchWriteToDb = async (tableName, data) => {
	const dynamoDb = new aws.DynamoDB({
	maxRetries: 999
	})
	const docClient = new aws.DynamoDB.DocumentClient({
	service: dynamoDb,
	convertEmptyValues: true
	})

crizant / main.dart

Created February 7, 2020 17:27

Flutter conditional rendering - good practice

	// Good
	class MyWidget extends StatelessWidget {
	final List<int> numbers = [];

	@override
	Widget build(BuildContext context) {
	return Container(
	child: Conditional.single(
	context: context,
	conditionBuilder: (BuildContext context) {

Crizant crizant