73 lines
2.2 KiB
Dart
73 lines
2.2 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:flutter_bloc/flutter_bloc.dart';
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import 'package:hl_lieferservice/widget/operations/bloc/operation_bloc.dart';
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import 'package:hl_lieferservice/widget/operations/presentation/message_container.dart';
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import '../bloc/operation_state.dart';
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/// OperationViewEnforcer
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///
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/// A view that encapsulates the functionality to react to asynchronous operations.
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/// It is capable of showing a loading indicator while an operation is ongoing and it shows
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/// a error message if the operation failed.
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class OperationViewEnforcer extends StatefulWidget {
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final Widget child;
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const OperationViewEnforcer({super.key, required this.child});
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@override
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State<OperationViewEnforcer> createState() => _OperationViewEnforcerState();
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}
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class _OperationViewEnforcerState extends State<OperationViewEnforcer> {
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OverlayEntry? _overlayEntry;
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@override
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void dispose() {
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_overlayEntry?.remove();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return BlocListener<OperationBloc, OperationState>(
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listener: (context, state) {
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if (state is OperationLoading) {
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if (_overlayEntry == null) {
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_overlayEntry = _createOverlayEntry(context);
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Overlay.of(context).insert(_overlayEntry!);
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}
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} else {
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_overlayEntry?.remove();
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_overlayEntry = null;
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}
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if (state is OperationFinished) {
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if (state.message != null) {
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text(state.message!)),
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);
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}
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}
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if (state is OperationFailed) {
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text(state.message)),
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);
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}
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},
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child: widget.child,
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);
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}
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OverlayEntry _createOverlayEntry(BuildContext context) {
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return OverlayEntry(
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builder: (context) => DecoratedBox(
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decoration: const BoxDecoration(
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color: Color.fromRGBO(128, 128, 128, 0.8),
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),
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child: const Center(
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child: CircularProgressIndicator(color: Colors.white),
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),
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),
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);
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}
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} |