我在我的Dart中使用了以下代码,其中使用了redux和flutter_redux包。一切正常,但如您所见,我必须使用以下语法来调用适当的操作。
callback['onIncrement'](34)
它是有效的,但它很丑陋。我如何改进它,使其读起来更像这样:
callback.onIncrement(34)
代码如下:
StoreConnector<AppState,Map<String,Function>>(
converter: (store) {
return {
'onIncrement': (value) => store.dispatch(IncrementAction(value)),
'onDecrement': () => store.dispatch(Actions.decrement)
};
},
builder: (context, callback) {
return Column(
children: <Widget>[
FlatButton(
child: Text('Increment Counter', style: TextStyle(color: Colors.white)),
color: Colors.orange,
onPressed: () => callback['onIncrement'](1)
更新:
现在,我正在使用枚举,它好不到哪里去:
StoreConnector<AppState,Map<Actions,Function>>(
converter: (store) {
return {
Actions.increment: (value) => store.dispatch(IncrementAction(value)),
Actions.decrement: () => store.dispatch(Actions.decrement)
};
},
builder: (context, callback) {
return Column(
children: <Widget>[
FlatButton(
child: Text('Increment Counter', style: TextStyle(color: Colors.white)),
color: Colors.orange,
onPressed: () => callback[Actions.increment](23)
发布于 2019-05-21 05:55:17
据我所知,在Dart中不可能做到这一点。您应该改用ViewModel
:
StoreConnector<AppState, ViewModel>(
converter: ViewModel.fromStore,
builder: (context, viewModel) {
return FlatButton(
onPressed: () => viewModel.onIncrement(1),
...
);
},
}
...
class ViewModel {
final void Function(int) onIncrement;
final void Function(int) onDecrement;
ViewModel({@required this.onIncrement, @required this.onDecrement});
factory ViewModel.fromStore(Store store) {
return ViewModel(
onIncrement: (value) => store.dispatch(IncrementAction(value)),
onDecrement: (value) => store.dispatch(DecrementAction(value)),
);
}
}
https://stackoverflow.com/questions/56225683
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