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samples/platform_design/lib/utils.dart

100 lines
2.9 KiB

import 'dart:math';
import 'package:english_words/english_words.dart';
// This reimplements generateWordPair because english_words's
// implementation has some performance issues.
// https://github.com/filiph/english_words/issues/9
// ignore: implementation_imports
import 'package:english_words/src/words/unsafe.dart';
import 'package:flutter/material.dart';
// This file has a number of platform-agnostic non-Widget utility functions.
const _myListOfRandomColors = [
Colors.red,
Colors.blue,
Colors.teal,
Colors.yellow,
Colors.amber,
Colors.deepOrange,
Colors.green,
Colors.indigo,
Colors.lime,
Colors.pink,
Colors.orange,
];
final _random = Random();
final wordPairIterator = generateWordPair();
Iterable<WordPair> generateWordPair() sync* {
bool filterWord(String word) => unsafe.contains(word);
String pickRandom(List<String> list) => list[_random.nextInt(list.length)];
String prefix;
while (true) {
if (_random.nextBool()) {
prefix = pickRandom(adjectives);
} else {
prefix = pickRandom(nouns);
}
final suffix = pickRandom(nouns);
if (filterWord(prefix) || filterWord(suffix)) continue;
final wordPair = WordPair(prefix, suffix);
yield wordPair;
}
}
String generateRandomHeadline() {
final artist = capitalizePair(wordPairIterator.first);
switch (_random.nextInt(10)) {
case 0:
return '$artist says ${nouns[_random.nextInt(nouns.length)]}';
case 1:
return '$artist arrested due to ${wordPairIterator.first.join(' ')}';
case 2:
return '$artist releases ${capitalizePair(wordPairIterator.first)}';
case 3:
return '$artist talks about his ${nouns[_random.nextInt(nouns.length)]}';
case 4:
return '$artist talks about her ${nouns[_random.nextInt(nouns.length)]}';
case 5:
return '$artist talks about their ${nouns[_random.nextInt(nouns.length)]}';
case 6:
return '$artist says their music is inspired by ${wordPairIterator.first.join(' ')}';
case 7:
return '$artist says the world needs more ${nouns[_random.nextInt(nouns.length)]}';
case 8:
return '$artist calls their band ${adjectives[_random.nextInt(adjectives.length)]}';
case 9:
return '$artist finally ready to talk about ${nouns[_random.nextInt(nouns.length)]}';
}
assert(false, 'Failed to generate news headline');
return null;
}
List<MaterialColor> getRandomColors(int amount) {
return List<MaterialColor>.generate(amount, (index) {
return _myListOfRandomColors[_random.nextInt(_myListOfRandomColors.length)];
});
}
List<String> getRandomNames(int amount) {
return wordPairIterator
.take(amount)
.map((pair) => capitalizePair(pair))
.toList();
}
String capitalize(String word) {
return '${word[0].toUpperCase()}${word.substring(1).toLowerCase()}';
}
String capitalizePair(WordPair pair) {
return '${capitalize(pair.first)} ${capitalize(pair.second)}';
}