Add collision behavior support

Author: aednlaxer

packages/google_maps_flutter/google_maps_flutter_ios/ios/Classes/GoogleMapController.m

@@ -731,10 +731,12 @@ - (nullable FlutterStandardTypedData *)takeSnapshotWithError:
   return imageData ? [FlutterStandardTypedData typedDataWithBytes:imageData] : nil;
 }
 
-- (nullable NSNumber *)isAdvancedMarkersAvailable:(FlutterError *_Nullable __autoreleasing *_Nonnull) error {
-    NSUInteger advancedMarkerFlag = self.controller.mapView.mapCapabilities & GMSMapCapabilityFlagsAdvancedMarkers;
-    BOOL boolValue = advancedMarkerFlag != 0;
-    return [NSNumber numberWithBool:boolValue];
+- (nullable NSNumber *)isAdvancedMarkersAvailable:
+    (FlutterError *_Nullable __autoreleasing *_Nonnull)error {
+  NSUInteger advancedMarkerFlag =
+      self.controller.mapView.mapCapabilities & GMSMapCapabilityFlagsAdvancedMarkers;
+  BOOL boolValue = advancedMarkerFlag != 0;
+  return [NSNumber numberWithBool:boolValue];
 }
 
 @end

packages/google_maps_flutter/google_maps_flutter_ios/ios/Classes/GoogleMapMarkerController.m

@@ -107,6 +107,13 @@ - (void)setZIndex:(int)zIndex {
   self.marker.zIndex = zIndex;
 }
 
+- (void)setCollisionBehavior:(int)collisionBehavior {
+  if ([self.marker isKindOfClass:[GMSAdvancedMarker class]]) {
+    GMSCollisionBehavior collitionBehaviorValue = (GMSCollisionBehavior)collisionBehavior;
+    [(GMSAdvancedMarker *)self.marker setCollisionBehavior:(collitionBehaviorValue)];
+  }
+}
+
 - (void)updateFromPlatformMarker:(FGMPlatformMarker *)platformMarker
                        registrar:(NSObject<FlutterPluginRegistrar> *)registrar
                      screenScale:(CGFloat)screenScale {
@@ -120,6 +127,7 @@ - (void)updateFromPlatformMarker:(FGMPlatformMarker *)platformMarker
   [self setPosition:FGMGetCoordinateForPigeonLatLng(platformMarker.position)];
   [self setRotation:platformMarker.rotation];
   [self setZIndex:platformMarker.zIndex];
+  [self setCollisionBehavior:platformMarker.collisionBehavior]
   FGMPlatformInfoWindow *infoWindow = platformMarker.infoWindow;
   [self setInfoWindowAnchor:FGMGetCGPointForPigeonPoint(infoWindow.anchor)];
   if (infoWindow.title) {
@@ -169,7 +177,10 @@ - (void)addMarker:(FGMPlatformMarker *)markerToAdd {
   CLLocationCoordinate2D position = FGMGetCoordinateForPigeonLatLng(markerToAdd.position);
   NSString *markerIdentifier = markerToAdd.markerId;
   NSString *clusterManagerIdentifier = markerToAdd.clusterManagerId;
-  GMSMarker *marker = [GMSMarker markerWithPosition:position];
+  NSNumber *isAdvanced = markerToAdd[@"isAdvanced"];
+  GMSMarker *marker = isAdvanced ? [GMSAdvancedMarker markerWithPosition:position]
+                                 : [GMSMarker markerWithPosition:position];
+
   FLTGoogleMapMarkerController *controller =
       [[FLTGoogleMapMarkerController alloc] initWithMarker:marker
                                           markerIdentifier:markerIdentifier

packages/google_maps_flutter/google_maps_flutter_platform_interface/lib/src/types/advanced_marker.dart

@@ -109,6 +109,11 @@ class AdvancedMarker extends Marker {
       }
     }
 
+    // Add a flag indicating that this is an advanced marker. This might be used
+    // by platform implementations to distinguish between legacy and advanced
+    // markers
+    addIfPresent('isAdvanced', true);
+
     addIfPresent('markerId', markerId.value);
     addIfPresent('alpha', alpha);
     addIfPresent('anchor', offsetToJson(anchor));