Controller view lifecycle

ControllerLifecycle.kt

package co.mopo.android.ui.base

import android.content.Context
import android.view.View
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.LifecycleRegistry
import com.bluelinelabs.conductor.Controller
import com.bluelinelabs.conductor.Controller.LifecycleListener


class AndroidXLifecycleListener(
        val mainLifecycle: LifecycleRegistry,
        val viewLifecycle: LifecycleRegistry
) : LifecycleListener() {

    override fun postContextAvailable(controller: Controller, context: Context) {
        mainLifecycle.handleLifecycleEvent(Lifecycle.Event.ON_CREATE) // --> State.CREATED;
    }

    override fun postCreateView(controller: Controller, view: View) {
        mainLifecycle.handleLifecycleEvent(Lifecycle.Event.ON_START) // --> State.STARTED;
        viewLifecycle.handleLifecycleEvent(Lifecycle.Event.ON_CREATE) // --> State.STARTED;
    }

    override fun postAttach(controller: Controller, view: View) {
        mainLifecycle.handleLifecycleEvent(Lifecycle.Event.ON_RESUME) // --> State.RESUMED;
        viewLifecycle.handleLifecycleEvent(Lifecycle.Event.ON_RESUME) // --> State.RESUMED;
    }

    override fun preDetach(controller: Controller, view: View) {
        mainLifecycle.handleLifecycleEvent(Lifecycle.Event.ON_PAUSE) // --> State.STARTED;
        viewLifecycle.handleLifecycleEvent(Lifecycle.Event.ON_PAUSE) // --> State.STARTED;
    }

    override fun preDestroyView(controller: Controller, view: View) {
        mainLifecycle.handleLifecycleEvent(Lifecycle.Event.ON_STOP) // --> State.CREATED;
        viewLifecycle.handleLifecycleEvent(Lifecycle.Event.ON_DESTROY) // --> State.CREATED;
    }

    override fun preContextUnavailable(controller: Controller, context: Context) {
        // do nothing
    }

    override fun preDestroy(controller: Controller) {
        mainLifecycle.handleLifecycleEvent(Lifecycle.Event.ON_DESTROY) // --> State.DESTROYED;
    }
}

fun <C> makeAndroidXLifecycleListener(controller: C): AndroidXLifecycleListener
        where C: Controller, C: LifecycleOwner
{
    val mainLifecycle = LifecycleRegistry(controller) // --> State.INITIALIZED
    val viewLifecycleOwner = ControllerViewLifecycleOwner()
    val viewLifecycle = viewLifecycleOwner.viewLifecycle
    val listener = AndroidXLifecycleListener(mainLifecycle, viewLifecycle)
    controller.addLifecycleListener(listener)
    return listener
}

private class ControllerViewLifecycleOwner : LifecycleOwner {
    val viewLifecycle = LifecycleRegistry(this) // --> State.INITIALIZED
    override fun getLifecycle() = viewLifecycle
}