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Create a delegate for MapboxNavigation
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139
...gation-core/src/main/java/com/mapbox/navigation/core/lifecycle/RequireMapboxNavigation.kt
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| @file:JvmName("RequireMapboxNavigation") | ||
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| package com.mapbox.navigation.core.lifecycle | ||
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| import androidx.lifecycle.DefaultLifecycleObserver | ||
| import androidx.lifecycle.Lifecycle | ||
| import androidx.lifecycle.LifecycleOwner | ||
| import com.mapbox.navigation.base.ExperimentalPreviewMapboxNavigationAPI | ||
| import com.mapbox.navigation.core.MapboxNavigation | ||
| import kotlin.properties.ReadOnlyProperty | ||
| import kotlin.reflect.KProperty | ||
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| /** | ||
| * Extension function to make it simple to create the [RequireMapboxNavigationDelegate]. Below are | ||
| * a couple examples of how you may use the delegate. | ||
| * | ||
| * Default can be used when [MapboxNavigationApp] is setup elsewhere. | ||
| * ``` | ||
| * val mapboxNavigation by requireMapboxNavigation() | ||
| * ``` | ||
| * | ||
| * Initialize the [MapboxNavigationApp] when you are ready to use it | ||
| * ``` | ||
| * val mapboxNavigation by requireMapboxNavigation { | ||
| * MapboxNavigationApp.setup(..) | ||
| * } | ||
| * ``` | ||
| * | ||
| * Register subscriptions and setup MapboxNavigationApp | ||
| * ``` | ||
| * private val mapboxNavigation by requireMapboxNavigation( | ||
| * onResumedObserver = object : MapboxNavigationObserver { | ||
| * override fun onAttached(mapboxNavigation: MapboxNavigation) { | ||
| * mapboxNavigation.registerLocationObserver(locationObserver) | ||
| * mapboxNavigation.registerRoutesObserver(routesObserver) | ||
| * } | ||
| * override fun onDetached(mapboxNavigation: MapboxNavigation) { | ||
| * mapboxNavigation.unregisterLocationObserver(locationObserver) | ||
| * mapboxNavigation.unregisterRoutesObserver(routesObserver) | ||
| * } | ||
| * } | ||
| * ) { | ||
| * MapboxNavigationApp.setup( | ||
| * NavigationOptions.Builder(this) | ||
| * .accessToken(accessToken) | ||
| * .build() | ||
| * ) | ||
| * } | ||
| * ``` | ||
| * | ||
| * @see [RequireMapboxNavigationDelegate] for more details. | ||
| */ | ||
| @ExperimentalPreviewMapboxNavigationAPI | ||
| fun requireMapboxNavigation( | ||
| onCreatedObserver: MapboxNavigationObserver? = null, | ||
| onStartedObserver: MapboxNavigationObserver? = null, | ||
| onResumedObserver: MapboxNavigationObserver? = null, | ||
| onInitialize: (() -> Unit)? = null, | ||
| ): ReadOnlyProperty<LifecycleOwner, MapboxNavigation> = RequireMapboxNavigationDelegate( | ||
| onCreatedObserver = onCreatedObserver, | ||
| onStartedObserver = onStartedObserver, | ||
| onResumedObserver = onResumedObserver, | ||
| onInitialize = onInitialize | ||
| ) | ||
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| /** | ||
| * Attaches a [LifecycleOwner] to [MapboxNavigationApp] and provides access to [MapboxNavigation]. | ||
| * | ||
| * You can choose to call [MapboxNavigationApp.setup] in the [onInitialize]. You can also setup in | ||
| * the onCreate calls, or any call that happens before this delegate is accessed. The delegate will | ||
| * crash if accessed when the app is not setup or an attached lifecycle has not been created. | ||
| * | ||
| * You can use the observers parameter to setup any subscriptions. This is important because the | ||
| * [MapboxNavigation] instance can be re-created with [MapboxNavigationApp.disable], or if all | ||
| * [MapboxNavigationApp.attach] lifecycles are destroyed. | ||
| * | ||
| * @param onCreatedObserver registered to the [Lifecycle.State.CREATED] lifecycle | ||
| * @param onStartedObserver registered to the [Lifecycle.State.STARTED] lifecycle | ||
| * @param onResumedObserver registered to the [Lifecycle.State.RESUMED] lifecycle | ||
| * @param onInitialize called when the property is read for the first time | ||
| */ | ||
| internal class RequireMapboxNavigationDelegate( | ||
| private val onCreatedObserver: MapboxNavigationObserver? = null, | ||
| private val onStartedObserver: MapboxNavigationObserver? = null, | ||
| private val onResumedObserver: MapboxNavigationObserver? = null, | ||
| private val onInitialize: (() -> Unit)? = null | ||
| ) : ReadOnlyProperty<LifecycleOwner, MapboxNavigation> { | ||
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| private lateinit var lifecycleOwner: LifecycleOwner | ||
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| private val lifecycleObserver = object : DefaultLifecycleObserver { | ||
| override fun onCreate(owner: LifecycleOwner) { | ||
| onCreatedObserver?.let { MapboxNavigationApp.registerObserver(it) } | ||
| } | ||
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| override fun onDestroy(owner: LifecycleOwner) { | ||
| onCreatedObserver?.let { MapboxNavigationApp.unregisterObserver(it) } | ||
| } | ||
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| override fun onStart(owner: LifecycleOwner) { | ||
| onStartedObserver?.let { MapboxNavigationApp.registerObserver(it) } | ||
| } | ||
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| override fun onStop(owner: LifecycleOwner) { | ||
| onStartedObserver?.let { MapboxNavigationApp.unregisterObserver(it) } | ||
| } | ||
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| override fun onResume(owner: LifecycleOwner) { | ||
| onResumedObserver?.let { MapboxNavigationApp.registerObserver(it) } | ||
| } | ||
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| override fun onPause(owner: LifecycleOwner) { | ||
| onResumedObserver?.let { MapboxNavigationApp.unregisterObserver(it) } | ||
| } | ||
| } | ||
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| /** | ||
| * Returns an instance of [MapboxNavigation], the first retrieval will attach the [thisRef] | ||
| * to [MapboxNavigationApp.attach]. If [MapboxNavigationApp.isSetup] is false after all | ||
| * observers and initializers, this property getter will crash. | ||
| * | ||
| * @param thisRef - the [LifecycleOwner] that needs access to [MapboxNavigation]. | ||
| * @param property - ignored | ||
| */ | ||
| override fun getValue(thisRef: LifecycleOwner, property: KProperty<*>): MapboxNavigation { | ||
| if (!this::lifecycleOwner.isInitialized) { | ||
| onInitialize?.invoke() | ||
| this.lifecycleOwner = thisRef | ||
| MapboxNavigationApp.attach(lifecycleOwner) | ||
| lifecycleOwner.lifecycle.addObserver(lifecycleObserver) | ||
| } | ||
| val mapboxNavigation = MapboxNavigationApp.current() | ||
| checkNotNull(mapboxNavigation) { | ||
| "MapboxNavigation cannot be null. Ensure that MapboxNavigationApp is setup and an" + | ||
| " attached lifecycle is at least CREATED." | ||
| } | ||
| return mapboxNavigation | ||
| } | ||
| } |
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