Initial commit

compose-routing/src/main/kotlin/it/vfsfitvnm/route/RouteHandler.kt

@@ -0,0 +1,73 @@
+package it.vfsfitvnm.route
+
+import androidx.activity.compose.BackHandler
+import androidx.activity.compose.LocalOnBackPressedDispatcherOwner
+import androidx.compose.animation.AnimatedContent
+import androidx.compose.animation.AnimatedContentScope
+import androidx.compose.animation.ContentTransform
+import androidx.compose.animation.ExperimentalAnimationApi
+import androidx.compose.animation.core.updateTransition
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+
+@ExperimentalAnimationApi
+@Composable
+fun RouteHandler(
+    modifier: Modifier = Modifier,
+    listenToGlobalEmitter: Boolean = false,
+    handleBackPress: Boolean = true,
+    transitionSpec: AnimatedContentScope<RouteHandlerScope>.() -> ContentTransform = { fastFade },
+    content: @Composable RouteHandlerScope.() -> Unit
+) {
+    var route by rememberRoute()
+
+    RouteHandler(
+        route = route,
+        onRouteChanged = { route = it },
+        listenToGlobalEmitter = listenToGlobalEmitter,
+        handleBackPress = handleBackPress,
+        transitionSpec = transitionSpec,
+        modifier = modifier,
+        content = content
+    )
+}
+
+@ExperimentalAnimationApi
+@Composable
+fun RouteHandler(
+    route: Route?,
+    onRouteChanged: (Route?) -> Unit,
+    modifier: Modifier = Modifier,
+    listenToGlobalEmitter: Boolean = false,
+    handleBackPress: Boolean = true,
+    transitionSpec: AnimatedContentScope<RouteHandlerScope>.() -> ContentTransform = { fastFade },
+    content: @Composable RouteHandlerScope.() -> Unit
+) {
+    val backDispatcher = LocalOnBackPressedDispatcherOwner.current?.onBackPressedDispatcher
+
+    val scope = remember(route) {
+        RouteHandlerScope(
+            route = route,
+            push = onRouteChanged,
+            pop = { if (handleBackPress) backDispatcher?.onBackPressed() else onRouteChanged(null) }
+        )
+    }
+
+    if (listenToGlobalEmitter) {
+        LaunchedEffect(route) {
+            Route.GlobalEmitter.listener = if (route == null) onRouteChanged else null
+        }
+    }
+
+    BackHandler(enabled = handleBackPress && route != null) {
+        onRouteChanged(null)
+    }
+
+    updateTransition(targetState = scope, label = null).AnimatedContent(
+        transitionSpec = transitionSpec,
+        contentKey = { it.route?.tag },
+        modifier = modifier,
+    ) {
+        it.content()
+    }
+}