Merge pull request #300 from maqen/master

Added method for getting current bounds [android]

android/API.md

@@ -29,6 +29,7 @@
 | `getDirection` | `mapViewRef`, `callback` | Gets the current direction. Returns a single callback object. |
 | `onOpenAnnotation` | `{title: null, subtitle: null, latitude: 0, longitude: 0}` | Fired when focusing a an annotation. If the annotation is opened already, the event will not fire.
 | `onLongPress` | `{latitude: 0, longitude: 0}` | Fired when the user taps and holds the map.
+| `getBounds` | `mapViewRef`, `callback` | Returns current bounds for view (NE & SW).
 
 ## Methods for Modifying the Map State
 

android/src/main/java/com/mapbox/reactnativemapboxgl/ReactNativeMapboxGLManager.java

@@ -36,6 +36,7 @@ import java.net.URL;
 import java.net.HttpURLConnection;
 import android.graphics.drawable.BitmapDrawable;
 import javax.annotation.Nullable;
+import android.graphics.PointF;
 
 public class ReactNativeMapboxGLManager extends SimpleViewManager<MapView> {
 
@@ -397,6 +398,21 @@ public class ReactNativeMapboxGLManager extends SimpleViewManager<MapView> {
         return callbackDict;
     }
 
+    public WritableMap getBounds(MapView view) {
+      WritableMap callbackDict = Arguments.createMap();
+      int viewportWidth = view.getWidth();
+      int viewportHeight = view.getHeight();
+      if (viewportWidth > 0 && viewportHeight > 0) {
+        LatLng ne = view.fromScreenLocation(new PointF(viewportWidth, 0));
+        LatLng sw = view.fromScreenLocation(new PointF(0, viewportHeight));
+        callbackDict.putDouble("latNE", ne.getLatitude());
+        callbackDict.putDouble("lngNE", ne.getLongitude());
+        callbackDict.putDouble("latSW", sw.getLatitude());
+        callbackDict.putDouble("lngSW", sw.getLongitude());
+      }
+      return callbackDict;
+    }
+
     public MapView getMapView() {
         return mapView;
     }

android/src/main/java/com/mapbox/reactnativemapboxgl/ReactNativeMapboxGLModule.java

@@ -133,6 +133,12 @@ public class ReactNativeMapboxGLModule extends ReactContextBaseJavaModule {
         successCallback.invoke(location);
     }
 
+    @ReactMethod
+    public void getBounds(int mapRef, Callback successCallback) {
+      WritableMap bounds = aPackage.getManager().getBounds(aPackage.getManager().getMapView());
+      successCallback.invoke(bounds);
+    }
+
     public void setPackage(ReactNativeMapboxGLPackage aPackage) {
         this.aPackage = aPackage;
     }

index.android.js

@@ -44,6 +44,9 @@ var MapMixins = {
   getDirection(mapRef, callback) {;
     NativeModules.MapboxGLManager.getDirection(React.findNodeHandle(this.refs[mapRef]), callback);
   },
+  getBounds(mapRef, callback) {
+    NativeModules.MapboxGLManager.getBounds(React.findNodeHandle(this.refs[mapRef]), callback);
+  },
   mapStyles: NativeModules.MapboxGLManager.mapStyles,
   userTrackingMode: NativeModules.MapboxGLManager.userTrackingMode
 };