2. StateViewModel

StateViewModel manages interactions with Reducer. In your base we have the implementation of StateView<State> interface to can use onStateChanged auxiliar extension.

The implementation of StateViewModel<State, StateEvent> need receive Reducer<State, StateEvent>(With State and StateEvent interfaces) to works correctly.

When all is fine you can update your State using the updateTo(StateEvent) method passing your respective StateEvent.

State implementation checklist:

• Extend your event implementation from the Event interface;
• Extend your state event implementation from the StateEvent interface.

See ReducerScope, State and StateEvent doc to understand better.

Example:

class PersonViewModel(
    reducer: Reducer<PersonData, PersonStateEvent>
    // private val anyUseCase: AnyUseCase
) : StateViewModel<PersonData, PersonStateEvent>(reducer) {

    fun saveName(name: String) {
        if (name != requireStateValue().name) {
            updateTo(PersonStateEvent.UpdateName(name))
        }
    }

    fun saveAge(age: String) {
        if (age != requireStateValue().age) {
            updateTo(PersonStateEvent.UpdateAge(age))
        }
    }
}

*Method requireStateValue() inside of core.

Sample Code

Read about listener extensions to process LiveData of your view models with simple way.