61 lines
1.5 KiB
Dart
61 lines
1.5 KiB
Dart
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// lib/common/route_aware_state.dart
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import 'dart:async';
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import 'package:flutter/widgets.dart';
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import 'package:qhd_prevention/common/route_observer.dart';
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/// 可复用的 RouteAware State 基类
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/// 使用方式：class _MyPageState extends RouteAwareState<MyPage> { ... }
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abstract class RouteAwareState<T extends StatefulWidget> extends State<T> with RouteAware {
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/// 当页面真正可见（首次 push 或从上层 pop 返回）时会调用
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@protected
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FutureOr<void> onVisible();
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@override
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void didChangeDependencies() {
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super.didChangeDependencies();
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final ModalRoute? route = ModalRoute.of(context);
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if (route is PageRoute) {
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routeObserver.subscribe(this, route);
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}
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}
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@override
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void dispose() {
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try {
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routeObserver.unsubscribe(this);
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} catch (_) {}
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super.dispose();
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}
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@override
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void didPush() {
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// 页面被 push 到栈顶（首次展示）
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_safeCallOnVisible();
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}
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@override
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void didPopNext() {
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// 从上层 pop 回到当前页面（页面再次可见）
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_safeCallOnVisible();
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}
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@override
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void didPushNext() {
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// 当前页面被新的页面覆盖（不可见）
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super.didPushNext();
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}
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void _safeCallOnVisible() {
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// 延后到当前帧完成后执行，避免在 build 期间触发 setState 导致断言
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted) return;
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try {
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final r = onVisible();
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if (r is Future) {
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r.catchError((_) {});
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}
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} catch (_) {}
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});
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}
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}
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