fix!: leverage @StateFactoryMarker to flag State object creation without remember or similar mechanisms.

maps-compose/src/main/java/com/google/maps/android/compose/CameraPositionState.kt

@@ -22,6 +22,7 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.saveable.Saver
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshots.StateFactoryMarker
 import androidx.compose.runtime.staticCompositionLocalOf
 import com.google.android.gms.maps.CameraUpdate
 import com.google.android.gms.maps.CameraUpdateFactory
@@ -59,7 +60,7 @@ public inline fun rememberCameraPositionState(
  *
  * @param position the initial camera position
  */
-public class CameraPositionState(
+public class CameraPositionState private constructor(
     position: CameraPosition = CameraPosition(LatLng(0.0, 0.0), 0f, 0f, 0f)
 ) {
     /**
@@ -302,6 +303,16 @@ public class CameraPositionState(
     }
 
     public companion object {
+        /**
+         * Creates a new [CameraPositionState] object
+         *
+         * @param position the initial camera position
+         */
+        @StateFactoryMarker
+        public operator fun invoke(
+            position: CameraPosition = CameraPosition(LatLng(0.0, 0.0), 0f, 0f, 0f)
+        ): CameraPositionState = CameraPositionState(position)
+
         /**
          * The default saver implementation for [CameraPositionState]
          */

maps-compose/src/main/java/com/google/maps/android/compose/Marker.kt

@@ -27,6 +27,7 @@ import androidx.compose.runtime.rememberCompositionContext
 import androidx.compose.runtime.saveable.Saver
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshots.StateFactoryMarker
 import androidx.compose.ui.geometry.Offset
 import com.google.android.gms.maps.model.AdvancedMarkerOptions
 import com.google.android.gms.maps.model.BitmapDescriptor
@@ -72,9 +73,7 @@ public enum class DragState {
  *
  * @param position the initial marker position
  */
-public class MarkerState(
-    position: LatLng = LatLng(0.0, 0.0),
-) {
+public class MarkerState private constructor(position: LatLng) {
     /**
      * Current position of the marker.
      */
@@ -113,6 +112,16 @@ public class MarkerState(
     }
 
     public companion object {
+        /**
+         * Creates a new [MarkerState] object
+         *
+         * @param position the initial marker position
+         */
+        @StateFactoryMarker
+        public operator fun invoke(
+            position: LatLng = LatLng(0.0, 0.0)
+        ): MarkerState = MarkerState(position)
+
         /**
          * The default saver implementation for [MarkerState]
          */

maps-compose/src/main/java/com/google/maps/android/compose/TileOverlay.kt

@@ -21,6 +21,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshots.StateFactoryMarker
 import com.google.android.gms.maps.model.TileOverlay
 import com.google.android.gms.maps.model.TileProvider
 import com.google.maps.android.ktx.addTileOverlay
@@ -122,7 +123,7 @@ public fun TileOverlay(
  *
  * [clearTileCache] can be called to request that the map refresh these tiles.
  */
-public class TileOverlayState {
+public class TileOverlayState private constructor() {
 
     internal var tileOverlay: TileOverlay? by mutableStateOf(null)
 
@@ -139,6 +140,13 @@ public class TileOverlayState {
             .clearTileCache()
     }
 
+    public companion object {
+        /**
+         * Creates a new [TileOverlayState] object
+         */
+        @StateFactoryMarker
+        public operator fun invoke(): TileOverlayState = TileOverlayState()
+    }
 }
 
 @Composable

maps-compose/src/main/java/com/google/maps/android/compose/streetview/StreetViewCameraPositionState.kt

@@ -5,6 +5,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshots.StateFactoryMarker
 import com.google.android.gms.maps.StreetViewPanorama
 import com.google.android.gms.maps.model.LatLng
 import com.google.android.gms.maps.model.StreetViewPanoramaCamera
@@ -18,7 +19,7 @@ public inline fun rememberStreetViewCameraPositionState(
     StreetViewCameraPositionState().apply(init)
 }
 
-public class StreetViewCameraPositionState {
+public class StreetViewCameraPositionState private constructor() {
 
     /**
      * The location of the panorama.
@@ -86,4 +87,13 @@ public class StreetViewCameraPositionState {
     public fun setPosition(panoId: String) {
         panorama?.setPosition(panoId)
     }
+
+    public companion object {
+        /**
+         * Creates a new [StreetViewCameraPositionState] object
+         */
+        @StateFactoryMarker
+        public operator fun invoke(): StreetViewCameraPositionState =
+            StreetViewCameraPositionState()
+    }
 }