How to pass generic provider to child?-CodePudding

I want to create a universal alert that I will use several times in my app.

class SelectIconAlertDialogWidget extends StatelessWidget {
  const SelectIconAlertDialogWidget({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final model = Provider.of<IncomeViewModel>(context, listen: true).state;

    return AlertDialog(
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(40),
      ),

Problem is that I can not figure out how to pass type of parent ChangeNotifier

                  showDialog<String>(
                    context: context,
                    builder: (_) =>
                        ChangeNotifierProvider<IncomeViewModel>.value(
                      value: view,
                      child: const SelectIconAlertDialogWidget(),
                    ),
                  );

I have a lot of ViewModels that will use this alert so dont want to repeat this code and write generic Alert that I can use with any ViewModel. How can I achieve this?

CodePudding user response：

check this video, add MultiProvider in your main.dart file, so all the widgets under the tree can access these provider values

CodePudding user response：

Add type parameter for your class

 class SelectIconAlertDialogWidget<T extends ChangeNotifier> extends StatelessWidget {
  const SelectIconAlertDialogWidget({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    // and you can use generic type T like this:
    final model = Provider.of<T>(context, listen: true).state;

    return AlertDialog(
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(40),
      ),

And call it passing type parameter SelectIconAlertDialogWidget<IncomeViewModel>()

showDialog<String>(
                    context: context,
                    builder: (_) =>
                        ChangeNotifierProvider<IncomeViewModel>.value(
                      value: view,
                      child: const SelectIconAlertDialogWidget<IncomeViewModel>(),
                    ),
                  );