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fix: improve snapshot handling and type safety in MultiStreamBuilder

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Sanders
2025-05-04 16:36:32 +03:00
parent 59265f53c2
commit 49238fbded
1 changed files with 15 additions and 12 deletions
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finance_app/lib/screens/expenses_screen.dart
+15 -12
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@@ -228,22 +228,26 @@ class _ExpensesScreenState extends State<ExpensesScreen> with TickerProviderStat
],
builder: (context, snapshots) {
// Handle loading states for all streams
// FIX: Add explicit type annotation for the lambda parameter 's'
if (snapshots.any((AsyncSnapshot<dynamic> s) => s.connectionState == ConnectionState.waiting && !s.hasData)) {
if (snapshots.any((s) => s.connectionState == ConnectionState.waiting && !s.hasData)) {
return const Center(child: CircularProgressIndicator());
}
// Handle error states for all streams
// FIX: Add explicit type annotation for the lambda parameter 's'
if (snapshots.any((AsyncSnapshot<dynamic> s) => s.hasError)) {
// Combine error messages or show a generic one
String errors = snapshots.where((s) => s.hasError).map((s) => s.error.toString()).join('\n');
return Center(child: Text('Error loading data:\n$errors'));
final errorSnapshots = snapshots.where((s) => s.hasError).toList();
if (errorSnapshots.isNotEmpty) {
return Center(
child: Text(
'Error loading data:\n${errorSnapshots.map((s) => s.error).join('\n')}',
textAlign: TextAlign.center,
),
);
}
// Extract data (provide defaults)
final expenseCategories = snapshots[0].data as List<Category>? ?? [];
final totalIncome = snapshots[1].data as double? ?? 0.0;
final totalExpenses = snapshots[2].data as double? ?? 0.0; // Use direct total expenses
// Safely extract data with proper type checking
try {
final expenseCategories = (snapshots[0].data as List<Category>?) ?? [];
final totalIncome = (snapshots[1].data as double?) ?? 0.0;
final totalExpenses = (snapshots[2].data as double?) ?? 0.0;
// Main column layout
return Column(
@@ -591,7 +595,6 @@ extension on AsyncSnapshot<List<AsyncSnapshot>> {
// Helper widget to manage multiple streams for the main body
class MultiStreamBuilder extends StatelessWidget {
final List<Stream<dynamic>> streams;
// FIX: Use AsyncWidgetBuilder<List<AsyncSnapshot<dynamic>>> for clarity
final AsyncWidgetBuilder<List<AsyncSnapshot<dynamic>>> builder;
const MultiStreamBuilder({