mirror of
https://github.com/wanghongenpin/proxypin.git
synced 2026-03-29 06:59:46 +08:00
100 lines
2.1 KiB
Dart
100 lines
2.1 KiB
Dart
import 'package:date_format/date_format.dart';
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import 'package:flutter/material.dart';
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/// @author wanghongen
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/// 2023/10/8
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extension ListFirstWhere<T> on Iterable<T> {
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T? firstWhereOrNull(bool Function(T) test) {
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try {
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return firstWhere(test);
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} on StateError {
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return null;
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}
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}
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}
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extension DateTimeFormat on DateTime {
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String format() {
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return formatDate(this, [yyyy, '-', mm, '-', dd, ' ', HH, ':', nn, ':', ss]);
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}
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}
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class ValueWrap<V> {
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V? _v;
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ValueWrap();
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factory ValueWrap.of(V v) {
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var valueWrap = ValueWrap<V>();
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valueWrap._v = v;
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return valueWrap;
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}
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void set(V? v) => this._v = v;
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V? get() => this._v;
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bool isNull() => this._v == null;
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}
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class Strings {
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static MapEntry<String, String>? splitFirst(String str, Pattern pattern) {
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var index = str.indexOf(pattern);
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if (index > 0) {
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return MapEntry(str.substring(0, index), str.substring(index + 1));
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}
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return null;
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}
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static String trimWrap(String str, String wrap) {
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if (str.startsWith(wrap) && str.endsWith(wrap)) {
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return str.substring(1, str.length - 1);
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}
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return str;
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}
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///防止文字自动换行
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static String autoLineString(String str) {
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return str.fixAutoLines();
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}
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}
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/// 防止文字自动换行
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/// 当中英文混合，或者中文与数字或者特殊符号，或则英文单词时，文本会被自动换行，
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/// 这样会导致，换行时上一行可能会留很大的空白区域
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/// 把每个字符插入一个0宽的字符， \u{200B}
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extension StringEnhance on String {
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String fixAutoLines() {
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return Characters(this).join('\u{200B}');
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}
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List<String> splitFirst(int code) {
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var index = codeUnits.indexOf(code);
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if (index == -1) {
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return [this];
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}
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var key = substring(0, index).trim();
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var value = substring(index + 1).trim();
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return [key, value];
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}
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}
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class Pair<K, V> {
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final K key;
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final V value;
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Pair(this.key, this.value);
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}
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class Maps {
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static K? getKey<K, V>(Map<K, V> map, V? value) {
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for (var entry in map.entries) {
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if (entry.value == value) {
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return entry.key;
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}
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}
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return null;
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}
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}
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