Scribbles for my bad memory

The error occurs because AppBar expects a widget that implements the PreferredSizeWidget interface, but Consumer<NoteModel> does not directly implement this interface. To solve this, you need to return an AppBar from within the Consumer builder method.

Here’s how you can do it:

Scaffold(
  appBar: PreferredSize(
    preferredSize: Size.fromHeight(kToolbarHeight),
    child: Consumer<NoteModel>(
      builder: (context, noteModel, child) {
        return AppBar(
          title: Text(
            'Your Title',
            style: TextStyle(
              color: noteModel.isPrivate ? Colors.red : Colors.green,
            ),
          ),
        );
      },
    ),
  ),
  body: // Your other widgets,
);

In this approach, I wrapped the Consumer<NoteModel> inside a PreferredSize widget to ensure it adheres to the PreferredSizeWidget interface required by appBar.

This should resolve the error while allowing you to update only the AppBar based on changes in your NoteModel.

Glory to ChatGPT!