feat: Add public currentCameraPositionState property (#262)

* feat: Add CompositionLocal for camera state * Change to a GoogleMapComposable-annotated property * Add kdoc
googlemaps · Feb 8, 2023 · bf88134 · bf88134
1 parent d0c01ff
commit bf88134
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diff --git a/maps-compose/src/main/java/com/google/maps/android/compose/CameraPositionState.kt b/maps-compose/src/main/java/com/google/maps/android/compose/CameraPositionState.kt
@@ -16,11 +16,13 @@ package com.google.maps.android.compose
 
 import androidx.annotation.UiThread
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.ReadOnlyComposable
 import androidx.compose.runtime.getValue
 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.staticCompositionLocalOf
 import com.google.android.gms.maps.CameraUpdate
 import com.google.android.gms.maps.CameraUpdateFactory
 import com.google.android.gms.maps.GoogleMap
@@ -309,3 +311,11 @@ public class CameraPositionState(
         )
     }
 }
+
+/** Provides the [CameraPositionState] used by the map. */
+internal val LocalCameraPositionState = staticCompositionLocalOf { CameraPositionState() }
+
+/** The current [CameraPositionState] used by the map. */
+public val currentCameraPositionState: CameraPositionState
+    @[GoogleMapComposable ReadOnlyComposable Composable]
+    get() = LocalCameraPositionState.current
diff --git a/maps-compose/src/main/java/com/google/maps/android/compose/GoogleMap.kt b/maps-compose/src/main/java/com/google/maps/android/compose/GoogleMap.kt
@@ -23,6 +23,7 @@ import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.Composition
 import androidx.compose.runtime.CompositionContext
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.MutableState
@@ -132,7 +133,11 @@ public fun GoogleMap(
                     mapProperties = currentMapProperties,
                     mapUiSettings = currentUiSettings,
                 )
-                currentContent?.invoke()
+                CompositionLocalProvider(
+                    LocalCameraPositionState provides cameraPositionState,
+                ) {
+                    currentContent?.invoke()
+                }
             }
         }
     }