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show-coordinates-in-multiple-formats/src/main/java/com/esri/arcgismaps/sample/showcoordinatesinmultipleformats/components/ComposeMapView.kt

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+/* Copyright 2023 Esri
+ *
+ * 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 com.esri.arcgismaps.sample.showcoordinatesinmultipleformats.components
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalLifecycleOwner
+import androidx.compose.ui.viewinterop.AndroidView
+import androidx.lifecycle.LifecycleOwner
+import com.arcgismaps.mapping.view.MapView
+import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
+import kotlinx.coroutines.launch
+
+/**
+ * Wraps the MapView in a Composable function.
+ */
+@Composable
+fun ComposeMapView(
+    modifier: Modifier = Modifier,
+    mapViewModel: MapViewModel,
+    onSingleTap: (SingleTapConfirmedEvent) -> Unit = {}
+) {
+    // get an instance of the current lifecycle owner
+    val lifecycleOwner = LocalLifecycleOwner.current
+    // get an instance of the ViewModel's MapViewState
+    val mapViewState = mapViewModel.mapViewState
+    // create and add MapView to the activity lifecycle
+    val mapView = createMapViewInstance(lifecycleOwner)
+
+    // wrap the MapView as an AndroidView
+    AndroidView(
+        modifier = modifier,
+        factory = { mapView },
+        // recomposes the MapView on changes in the MapViewState
+        update = { mapView ->
+            mapView.apply {
+                map = mapViewState.arcGISMap
+                mapView.graphicsOverlays.clear()
+                mapView.graphicsOverlays.add(mapViewState.graphicsOverlay)
+            }
+        }
+    )
+
+    // launch coroutine functions in the composition's CoroutineContext
+    LaunchedEffect(Unit) {
+        launch {
+            mapView.onSingleTapConfirmed.collect {
+                onSingleTap(it)
+            }
+        }
+    }
+}
+
+/**
+ * Create the MapView instance and add it to the Activity lifecycle
+ */
+@Composable
+fun createMapViewInstance(lifecycleOwner: LifecycleOwner): MapView {
+    // create the MapView
+    val mapView = MapView(LocalContext.current)
+    // add the side effects for MapView composition
+    DisposableEffect(lifecycleOwner) {
+        lifecycleOwner.lifecycle.addObserver(mapView)
+        onDispose {
+            lifecycleOwner.lifecycle.removeObserver(mapView)
+        }
+    }
+    return mapView
+}