add loadFailedBuilder rather than loadFailedChild #287
Description
Version: photo_view: ^0.9.2
Is your feature request related to a problem? Please describe.
I use PhotoViewGallery with my customer ImageProvider.
I want to show the error message generated by (customer or not) ImageProvider. But I find there is only a loadFailedChild property. I hope it can wrap by a function.
Describe the solution you'd like
In photo_view.dart, use _loadFailedError rather then _loadFailed:
// 1.
Future<ImageInfo> _getImage() {
// xxx
}, onChunk: (event) {
if (mounted) {
setState(() => _imageChunkEvent = event);
}
}, onError: (exception, stackTrace) {
if (!mounted) {
return;
}
setState(() {
// _loadFailed = true;
_loadFailedError = exception ?? 'unknown error'; // <<<
});
/* FlutterError.reportError(
FlutterErrorDetails(exception: exception, stack: stackTrace),
); */
});
stream.addListener(listener);
completer.future.then((_) {
stream.removeListener(listener);
});
return completer.future;
}
// 2.
@override
Widget build(BuildContext context) {
return _loadFailedError != null
? _buildLoadFailed() // <<<
: LayoutBuilder(
builder: (
BuildContext context,
BoxConstraints constraints,
) {
return widget.child == null
? _buildImage(context, constraints)
: _buildCustomChild(context, constraints);
},
);
}
// 3.
Widget _buildLoadFailed() {
return widget.loadFailedBuilder(_loadFailedError) ?? PhotoViewDefaultError(); // <<<
}