view_model.py

"""View model implementation for complex Pydantic rules example."""

from typing import Any, Dict

from nova.mvvm.interface import BindingInterface

from .model import Model


class ViewModel:
    """View model implementation for complex Pydantic rules example."""

    def __init__(self, model: Model, binding: BindingInterface) -> None:
        self.model = model

        # self.on_update is called any time the view updates the binding.
        self.form_data_bind = binding.new_bind(self.model.form, callback_after_update=self.send_cleaned_text_to_view)

    def send_cleaned_text_to_view(self, results: Dict[str, Any]) -> None:
        # This is necessary to send the cleaned text to the view since it's updated programmatically.
        self.form_data_bind.update_in_view(self.model.form)

    def update_form_data(self) -> None:
        # This will fail if you haven't called connect on the binding!
        self.form_data_bind.update_in_view(self.model.form)