64 lines
1.6 KiB
Dart
64 lines
1.6 KiB
Dart
// lib/base/base_state.dart
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import 'package:flutter/material.dart';
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/// 所有页面的基类，提供安全的 setState 封装
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///
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/// 使用方式：
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/// 1. 将页面的 State 类从 `State<YourPage>` 改为 `BaseState<YourPage>`
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/// 2. 将所有 `setState(() { ... })` 替换为 `safeSetState(() { ... })`
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abstract class BaseState<T extends StatefulWidget> extends State<T> {
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/// 安全的 setState，自动检查 mounted
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///
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/// 用法：
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/// ```dart
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/// safeSetState(() {
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/// _isLoading = false;
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/// });
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/// ```
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void safeSetState(VoidCallback fn) {
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if (mounted) {
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setState(fn);
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}
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}
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/// 安全执行异步操作，完成后自动刷新
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///
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/// 用法：
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/// ```dart
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/// await safeAsync(
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/// () => _loadData(), // 异步操作
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/// () => _isLoading = false, // 完成后执行的 setState
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/// );
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/// ```
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Future<void> safeAsync(
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Future<void> Function() action,
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VoidCallback onComplete, {
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VoidCallback? onError,
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}) async {
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try {
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await action();
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if (mounted) {
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setState(onComplete);
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}
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} catch (e) {
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debugPrint('⚠️ [BaseState] safeAsync error: $e');
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if (mounted) {
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setState(onComplete);
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}
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onError?.call();
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}
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}
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/// 显示 SnackBar（封装，确保 mounted）
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void showSafeSnackBar(String message, {Color? backgroundColor}) {
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if (!mounted) return;
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(
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content: Text(message),
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backgroundColor: backgroundColor ?? Colors.grey,
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duration: const Duration(seconds: 2),
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),
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);
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}
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}
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