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117 changes: 117 additions & 0 deletions
117
...Main/kotlin/com/copperleaf/ballast/navigation/browser/BaseBrowserNavigationInterceptor.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| package com.copperleaf.ballast.navigation.browser | ||
|
|
||
| import com.copperleaf.ballast.Queued | ||
| import com.copperleaf.ballast.awaitViewModelStart | ||
| import com.copperleaf.ballast.events | ||
| import com.copperleaf.ballast.navigation.internal.Uri | ||
| import com.copperleaf.ballast.navigation.internal.UriBuilder | ||
| import com.copperleaf.ballast.navigation.routing.Route | ||
| import com.copperleaf.ballast.navigation.routing.RouterContract | ||
| import com.copperleaf.ballast.navigation.routing.build | ||
| import com.copperleaf.ballast.navigation.routing.directions | ||
| import com.copperleaf.ballast.navigation.routing.mapCurrentDestination | ||
| import com.copperleaf.ballast.navigation.vm.RouterInterceptor | ||
| import com.copperleaf.ballast.navigation.vm.RouterInterceptorScope | ||
| import com.copperleaf.ballast.navigation.vm.RouterNotification | ||
| import kotlinx.coroutines.CompletableDeferred | ||
| import kotlinx.coroutines.CoroutineStart | ||
| import kotlinx.coroutines.Job | ||
| import kotlinx.coroutines.flow.Flow | ||
| import kotlinx.coroutines.flow.distinctUntilChanged | ||
| import kotlinx.coroutines.flow.filterIsInstance | ||
| import kotlinx.coroutines.flow.launchIn | ||
| import kotlinx.coroutines.flow.mapNotNull | ||
| import kotlinx.coroutines.flow.onEach | ||
| import kotlinx.coroutines.joinAll | ||
| import kotlinx.coroutines.launch | ||
|
|
||
| @Suppress("UNUSED_PARAMETER") | ||
| public abstract class BaseBrowserNavigationInterceptor<T : Route> internal constructor( | ||
| private val initialRoute: T | ||
| ) : RouterInterceptor<T> { | ||
|
|
||
| internal abstract fun getInitialUrl(): Uri? | ||
| internal abstract fun watchForUrlChanges(): Flow<Uri> | ||
| internal abstract fun setDestinationUrl(url: Uri) | ||
|
|
||
| final override fun RouterInterceptorScope<T>.start( | ||
| notifications: Flow<RouterNotification<T>> | ||
| ) { | ||
| launch(start = CoroutineStart.UNDISPATCHED) { | ||
| // start by setting the initial route from the browser hash, if provided when the webpage first loads | ||
| onViewModelInitSetStateFromBrowser(notifications) | ||
|
|
||
| // then sync the hash state to the router state (in both directions) | ||
| joinAll( | ||
| updateBrowserOnStateChange(notifications), | ||
| updateStateOnBrowserChange(notifications) | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| private suspend fun RouterInterceptorScope<T>.onViewModelInitSetStateFromBrowser( | ||
| notifications: Flow<RouterNotification<T>> | ||
| ) { | ||
| // wait for the BallastNotification.ViewModelStarted to be sent | ||
| notifications.awaitViewModelStart() | ||
|
|
||
| val initialDestinationUrl = getInitialUrl()?.encodedPathAndQuery | ||
| ?: initialRoute.directions().build() | ||
|
|
||
| val deferred = CompletableDeferred<Unit>() | ||
|
|
||
| sendToQueue( | ||
| Queued.HandleInput( | ||
| deferred, | ||
| RouterContract.Inputs.GoToDestination( | ||
| destination = initialDestinationUrl | ||
| ) | ||
| ) | ||
| ) | ||
|
|
||
| // wait for the initial URL to be set in the state, before allowing the rest of the address bar syncing to begin | ||
| deferred.await() | ||
| } | ||
|
|
||
| private fun RouterInterceptorScope<T>.updateBrowserOnStateChange( | ||
| notifications: Flow<RouterNotification<T>> | ||
| ): Job = launch(start = CoroutineStart.UNDISPATCHED) { | ||
| notifications | ||
| .events { it } | ||
| .filterIsInstance<RouterContract.Events.BackstackChanged<T>>() | ||
| .mapNotNull { ev -> | ||
| ev.backstack.mapCurrentDestination( | ||
| route = { | ||
| if (annotations.any { it is WebEventRouteAnnotation }) { | ||
| // ignore this request | ||
| null | ||
| } else { | ||
| UriBuilder.parse(originalDestinationUrl) | ||
| } | ||
| }, | ||
| notFound = { UriBuilder.parse(it) }, | ||
| ) | ||
| } | ||
| .distinctUntilChanged() | ||
| .onEach { destination -> setDestinationUrl(destination) } | ||
| .launchIn(this) | ||
| } | ||
|
|
||
| private fun RouterInterceptorScope<T>.updateStateOnBrowserChange( | ||
| notifications: Flow<RouterNotification<T>> | ||
| ): Job = launch(start = CoroutineStart.UNDISPATCHED) { | ||
| watchForUrlChanges() | ||
| .onEach { destination -> | ||
| sendToQueue( | ||
| Queued.HandleInput( | ||
| null, | ||
| RouterContract.Inputs.GoToDestination( | ||
| destination = destination.encodedPathAndQuery, | ||
| extraAnnotations = setOf(WebEventRouteAnnotation), | ||
| ) | ||
| ) | ||
| ) | ||
| } | ||
| .launchIn(this) | ||
| } | ||
| } |
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