84 lines
1.9 KiB
Dart
84 lines
1.9 KiB
Dart
import 'package:flutter/material.dart';
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/// 用户积分等全局状态
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class UserState {
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UserState._();
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static final ValueNotifier<int?> credits = ValueNotifier<int?>(null);
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static final ValueNotifier<String?> userId = ValueNotifier<String?>(null);
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static void setCredits(int? value) {
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credits.value = value;
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}
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static void setUserId(String? value) {
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userId.value = value;
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}
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static String formatCredits(int? value) {
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if (value == null) return '--';
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return value.toString().replaceAllMapped(
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RegExp(r'(\d{1,3})(?=(\d{3})+(?!\d))'),
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(m) => '${m[1]},',
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);
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}
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}
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/// 提供积分数据的 InheritedWidget
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class UserCreditsData extends InheritedWidget {
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const UserCreditsData({
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super.key,
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required this.credits,
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required super.child,
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});
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final int? credits;
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static UserCreditsData? of(BuildContext context) {
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return context.dependOnInheritedWidgetOfExactType<UserCreditsData>();
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}
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String get creditsDisplay => UserState.formatCredits(credits);
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@override
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bool updateShouldNotify(UserCreditsData oldWidget) {
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return oldWidget.credits != credits;
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}
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}
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/// 监听 UserState.credits 并向下提供 UserCreditsData
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class UserCreditsScope extends StatefulWidget {
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const UserCreditsScope({super.key, required this.child});
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final Widget child;
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@override
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State<UserCreditsScope> createState() => _UserCreditsScopeState();
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}
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class _UserCreditsScopeState extends State<UserCreditsScope> {
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@override
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void initState() {
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super.initState();
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UserState.credits.addListener(_onCreditsChanged);
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}
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@override
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void dispose() {
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UserState.credits.removeListener(_onCreditsChanged);
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super.dispose();
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}
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void _onCreditsChanged() {
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setState(() {});
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}
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@override
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Widget build(BuildContext context) {
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return UserCreditsData(
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credits: UserState.credits.value,
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child: widget.child,
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);
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}
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}
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