31 lines
1.0 KiB
Dart
31 lines
1.0 KiB
Dart
import 'package:flutter/foundation.dart';
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class MallWebHostState {
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const MallWebHostState({this.url, this.visible = false});
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final String? url;
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final bool visible;
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}
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/// 进程常驻的商城 WebView 状态，切换原生 Tab 时不销毁商城页面。
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class MallWebHostController {
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MallWebHostController._();
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static final instance = MallWebHostController._();
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final state = ValueNotifier(const MallWebHostState());
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Future<void> Function()? _backHandler;
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void preload(String url) {
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final old = state.value;
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if (old.url == url) return;
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state.value = MallWebHostState(url: url, visible: old.visible);
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}
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void open(String url) =>
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state.value = MallWebHostState(url: url, visible: true);
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void dismiss() => state.value = MallWebHostState(url: state.value.url);
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void clear() => state.value = const MallWebHostState();
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void attachBackHandler(Future<void> Function() handler) =>
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_backHandler = handler;
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void detachBackHandler() => _backHandler = null;
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Future<void> handleBack() => _backHandler?.call() ?? Future.value();
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}
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