Add onMapReady callback (react-native-maps#1369)

* Add onMapReady callback

Fix react-native-maps#246

* Call onMapReady when state has changed

* Add onMapReady callback on iOS

Author: Kerumen

docs/mapview.md

@@ -40,6 +40,7 @@ To access event data, you will need to use `e.nativeEvent`. For example, `onPres
 
 | Event Name | Returns | Notes
 |---|---|---|
+| `onMapReady` |  | Callback that is called once the map is fully loaded.
 | `onRegionChange` | `Region` | Callback that is called continuously when the region changes, such as when a user is dragging the map.
 | `onRegionChangeComplete` | `Region` | Callback that is called once when the region changes, such as when the user is done moving the map.
 | `onPress` | `{ coordinate: LatLng, position: Point }` | Callback that is called when user taps on the map.

lib/components/MapView.js

@@ -317,6 +317,11 @@ const propTypes = {
    */
   legalLabelInsets: EdgeInsetsPropType,
 
+  /**
+   * Callback that is called once the map is fully loaded.
+   */
+  onMapReady: PropTypes.func,
+
   /**
    * Callback that is called continuously when the user is dragging the map.
    */
@@ -440,14 +445,16 @@ class MapView extends React.Component {
   }
 
   _onMapReady() {
-    const { region, initialRegion } = this.props;
+    const { region, initialRegion, onMapReady } = this.props;
     if (region) {
       this.map.setNativeProps({ region });
     } else if (initialRegion) {
       this.map.setNativeProps({ region: initialRegion });
     }
     this._updateStyle();
-    this.setState({ isReady: true });
+    this.setState({ isReady: true }, () => {
+      if (onMapReady) onMapReady();
+    });
   }
 
   _onLayout(e) {

lib/ios/AirGoogleMaps/AIRGoogleMap.h

@@ -18,6 +18,7 @@
 @property (nonatomic, assign) MKCoordinateRegion initialRegion;
 @property (nonatomic, assign) MKCoordinateRegion region;
 @property (nonatomic, assign) NSString *customMapStyleString;
+@property (nonatomic, copy) RCTBubblingEventBlock onMapReady;
 @property (nonatomic, copy) RCTBubblingEventBlock onPress;
 @property (nonatomic, copy) RCTBubblingEventBlock onLongPress;
 @property (nonatomic, copy) RCTBubblingEventBlock onMarkerPress;
@@ -40,6 +41,7 @@
 @property (nonatomic, assign) BOOL showsUserLocation;
 @property (nonatomic, assign) BOOL showsMyLocationButton;
 
+- (void)didFinishTileRendering;
 - (BOOL)didTapMarker:(GMSMarker *)marker;
 - (void)didTapPolyline:(GMSPolyline *)polyline;
 - (void)didTapPolygon:(GMSPolygon *)polygon;

lib/ios/AirGoogleMaps/AIRGoogleMap.m

@@ -155,6 +155,10 @@ - (void)setRegion:(MKCoordinateRegion)region {
   self.camera = [AIRGoogleMap makeGMSCameraPositionFromMap:self  andMKCoordinateRegion:region];
 }
 
+- (void)didFinishTileRendering {
+    if (self.onMapReady) self.onMapReady(@{});
+}
+
 - (BOOL)didTapMarker:(GMSMarker *)marker {
   AIRGMSMarker *airMarker = (AIRGMSMarker *)marker;
 

lib/ios/AirGoogleMaps/AIRGoogleMapManager.m

@@ -59,6 +59,7 @@ - (UIView *)view
 RCT_EXPORT_VIEW_PROPERTY(showsUserLocation, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(showsMyLocationButton, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(customMapStyleString, NSString)
+RCT_EXPORT_VIEW_PROPERTY(onMapReady, RCTBubblingEventBlock)
 RCT_EXPORT_VIEW_PROPERTY(onPress, RCTBubblingEventBlock)
 RCT_EXPORT_VIEW_PROPERTY(onLongPress, RCTBubblingEventBlock)
 RCT_EXPORT_VIEW_PROPERTY(onChange, RCTBubblingEventBlock)
@@ -222,6 +223,11 @@ - (UIView *)view
 }
 
 
+- (void)mapViewDidFinishTileRendering:(GMSMapView *)mapView {
+    AIRGoogleMap *googleMapView = (AIRGoogleMap *)mapView;
+    [googleMapView didFinishTileRendering];
+}
+
 - (BOOL)mapView:(GMSMapView *)mapView didTapMarker:(GMSMarker *)marker {
   AIRGoogleMap *googleMapView = (AIRGoogleMap *)mapView;
   return [googleMapView didTapMarker:marker];

lib/ios/AirMaps/AIRMap.h

@@ -46,6 +46,7 @@ extern const CGFloat AIRMapZoomBoundBuffer;
 
 @property (nonatomic, assign) BOOL ignoreRegionChanges;
 
+@property (nonatomic, copy) RCTBubblingEventBlock onMapReady;
 @property (nonatomic, copy) RCTBubblingEventBlock onChange;
 @property (nonatomic, copy) RCTBubblingEventBlock onPress;
 @property (nonatomic, copy) RCTBubblingEventBlock onPanDrag;

lib/ios/AirMaps/AIRMapManager.m

@@ -85,6 +85,7 @@ - (UIView *)view
 RCT_EXPORT_VIEW_PROPERTY(minDelta, CGFloat)
 RCT_EXPORT_VIEW_PROPERTY(legalLabelInsets, UIEdgeInsets)
 RCT_EXPORT_VIEW_PROPERTY(mapType, MKMapType)
+RCT_EXPORT_VIEW_PROPERTY(onMapReady, RCTBubblingEventBlock)
 RCT_EXPORT_VIEW_PROPERTY(onChange, RCTBubblingEventBlock)
 RCT_EXPORT_VIEW_PROPERTY(onPanDrag, RCTBubblingEventBlock)
 RCT_EXPORT_VIEW_PROPERTY(onPress, RCTBubblingEventBlock)
@@ -662,6 +663,8 @@ - (void)mapViewDidFinishRenderingMap:(AIRMap *)mapView fullyRendered:(BOOL)fully
 {
     [mapView finishLoading];
     [mapView cacheViewIfNeeded];
+    
+    mapView.onMapReady(@{});
 }
 
 #pragma mark Private