DynamicNavGraphBuilder.kt
/*
* Copyright 2020 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
*
* http://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 androidx.navigation.dynamicfeatures
import androidx.annotation.IdRes
import androidx.navigation.NavDestinationDsl
import androidx.navigation.NavGraph
import androidx.navigation.NavGraphBuilder
import androidx.navigation.NavigatorProvider
import androidx.navigation.dynamicfeatures.DynamicActivityNavigator.Destination
import androidx.navigation.get
/**
* Construct a new [DynamicGraphNavigator.DynamicNavGraph]
*
* @param id NavGraph id.
* @param startDestination Id start destination in the graph
* @param builder Another builder for chaining.
*/
public inline fun NavigatorProvider.navigation(
@IdRes id: Int = 0,
@IdRes startDestination: Int,
builder: DynamicNavGraphBuilder.() -> Unit
): NavGraph = DynamicNavGraphBuilder(
this,
id,
startDestination
).apply(builder).build()
/**
* Construct a nested [DynamicGraphNavigator.DynamicNavGraph]
*
* @param id NavGraph id.
* @param startDestination Id start destination in the graph
* @param builder Another builder for chaining.
*/
public inline fun DynamicNavGraphBuilder.navigation(
@IdRes id: Int,
@IdRes startDestination: Int,
builder: DynamicNavGraphBuilder.() -> Unit
): Unit = destination(
DynamicNavGraphBuilder(
provider,
id,
startDestination
).apply(builder)
)
/**
* DSL for constructing a new [DynamicGraphNavigator.DynamicNavGraph]
*
* @param provider [NavigatorProvider] to use.
* @param id NavGraph id.
* @param startDestination Id start destination in the graph
*/
@NavDestinationDsl
public class DynamicNavGraphBuilder(
provider: NavigatorProvider,
@IdRes id: Int,
@IdRes private var startDestination: Int
) : NavGraphBuilder(provider, id, startDestination) {
/**
* The module name of this [Destination]'s dynamic feature module. This has to be the
* same as defined in the dynamic feature module's AndroidManifest.xml file.
*/
public var moduleName: String? = null
/**
* ID of the destination displayed during module installation. This generally does
* not need to be set, but is instead filled in by the NavHost via
* [DynamicGraphNavigator.installDefaultProgressDestination].
*/
public var progressDestination: Int = 0
/**
* @return The [DynamicGraphNavigator.DynamicNavGraph].
*/
override fun build(): NavGraph =
super.build().also { navGraph ->
if (navGraph is DynamicGraphNavigator.DynamicNavGraph) {
navGraph.moduleName = moduleName
navGraph.progressDestination = progressDestination
if (progressDestination == 0) {
val navGraphNavigator: DynamicGraphNavigator =
provider[DynamicGraphNavigator::class]
navGraphNavigator.destinationsWithoutDefaultProgressDestination
.add(navGraph)
}
}
}
}