Expose menu

[RankoR]

Menu has to be exposed for correct integration with navigation.

For example, now you can use this code for correct bottom nav switching on fragment change in AndroidX navigation:

internal fun matchDestination(destination: NavDestination, @IdRes destId: Int): Boolean {
    var currentDestination: NavDestination
    currentDestination = destination

    while (currentDestination.id != destId && currentDestination.parent != null) {
        currentDestination = currentDestination.parent as NavDestination
    }

    return currentDestination.id == destId
}

fun setupWithNavController(
    bottomNavigationView: ChipNavigationBar,
    navController: NavController
) {
    var selectedItemId = -1

    bottomNavigationView.setOnItemSelectedListener { itemId ->
        if (itemId != selectedItemId) {
            navController.navigate(itemId, null, null)
        }
    }

    val weakReference = WeakReference(bottomNavigationView)

    navController.addOnDestinationChangedListener(object :
        NavController.OnDestinationChangedListener {
        override fun onDestinationChanged(
            controller: NavController,
            destination: NavDestination,
            arguments: Bundle?
        ) {
            val view = weakReference.get()
            if (view == null) {
                navController.removeOnDestinationChangedListener(this)
            } else {
                view.menu?.let { menu ->
                    var h = 0

                    val size = menu.items.size
                    while (h < size) {
                        val item = menu.items[h]
                        if (matchDestination(destination, item.id)) {
                            view.setItemSelected(item.id)
                            selectedItemId = item.id
                        }

                        ++h
                    }
                }
            }
        }
    })
}

Note: menu items' ids must match navigation fragment ids.

[ismaeldivita]

Close since #20 is being tackled