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JetnewsNavigation.kt
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JetnewsNavigation.kt
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/*
* Copyright 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.jetnews.ui
import androidx.navigation.NavGraph.Companion.findStartDestination
import androidx.navigation.NavHostController
/**
* Destinations used in the [JetnewsApp].
*/
object JetnewsDestinations {
const val HOME_ROUTE = "home"
const val INTERESTS_ROUTE = "interests"
}
/**
* Models the navigation actions in the app.
*/
class JetnewsNavigationActions(navController: NavHostController) {
val navigateToHome: () -> Unit = {
navController.navigate(JetnewsDestinations.HOME_ROUTE) {
// Pop up to the start destination of the graph to
// avoid building up a large stack of destinations
// on the back stack as users select items
popUpTo(navController.graph.findStartDestination().id) {
saveState = true
}
// Avoid multiple copies of the same destination when
// reselecting the same item
launchSingleTop = true
// Restore state when reselecting a previously selected item
restoreState = true
}
}
val navigateToInterests: () -> Unit = {
navController.navigate(JetnewsDestinations.INTERESTS_ROUTE) {
popUpTo(navController.graph.findStartDestination().id) {
saveState = true
}
launchSingleTop = true
restoreState = true
}
}
}