Adding viewBounds function to return map view bounds of all corners in Lat/Lng. Based on contribution by @J-Gonzalez PR #81 but updated to match project structure now being used in main branch

Author: jjozwiak

android/src/main/java/com/hemangkumar/capacitorgooglemaps/CapacitorGoogleMaps.java

@@ -537,6 +537,48 @@ public void run() {
                 } else {
                     call.reject("map not found");
                 }
+
+            }
+        });
+    }
+
+    @PluginMethod()
+    public void viewBounds(final PluginCall call) {
+        final String mapId = call.getString("mapId");
+        getBridge().executeOnMainThread(new Runnable() {
+            @Override
+            public void run() {
+
+                CustomMapView customMapView = customMapViews.get(mapId);
+
+                if (customMapView != null) {
+                    JSObject result = new JSObject();
+                    JSObject bounds = new JSObject();
+                    JSObject farLeft = new JSObject();
+                    JSObject farRight = new JSObject();
+                    JSObject nearLeft = new JSObject();
+                    JSObject nearRight = new JSObject();
+
+                    farLeft.put("latitude", customMapView.googleMap.getProjection().getVisibleRegion().farLeft.latitude);
+                    farLeft.put("longitude", customMapView.googleMap.getProjection().getVisibleRegion().farLeft.longitude);
+                    farRight.put("latitude", customMapView.googleMap.getProjection().getVisibleRegion().farRight.latitude);
+                    farRight.put("longitude", customMapView.googleMap.getProjection().getVisibleRegion().farRight.longitude);
+                    nearLeft.put("latitude", customMapView.googleMap.getProjection().getVisibleRegion().nearLeft.latitude);
+                    nearLeft.put("longitude", customMapView.googleMap.getProjection().getVisibleRegion().nearLeft.longitude);
+                    nearRight.put("latitude", customMapView.googleMap.getProjection().getVisibleRegion().nearRight.latitude);
+                    nearRight.put("longitude", customMapView.googleMap.getProjection().getVisibleRegion().nearRight.longitude);
+
+                    bounds.put("farLeft",farLeft);
+                    bounds.put("farRight",farRight);
+                    bounds.put("nearLeft",nearLeft);
+                    bounds.put("nearRight",nearRight);
+                    result.put("bounds",bounds);
+
+                    call.resolve(result);
+                } else {
+                    call.reject("map not found");
+                }
+
             }
         });
     }

ios/Plugin/Plugin.m

@@ -26,4 +26,5 @@
            CAP_PLUGIN_METHOD(didBeginMovingCamera, CAPPluginReturnCallback);
            CAP_PLUGIN_METHOD(didMoveCamera, CAPPluginReturnCallback);
            CAP_PLUGIN_METHOD(didEndMovingCamera, CAPPluginReturnCallback);
+           CAP_PLUGIN_METHOD(viewBounds, CAPPluginReturnPromise);
 )

ios/Plugin/Plugin.swift

@@ -295,6 +295,41 @@ public class CapacitorGoogleMaps: CustomMapViewEvents {
         setCallbackIdForEvent(call: call, eventName: CustomMapView.EVENT_DID_END_MOVING_CAMERA);
     }
 
+    @objc func viewBounds(_ call: CAPPluginCall) {
+        let mapId: String = call.getString("mapId", "")
+
+        DispatchQueue.main.async {
+
+            guard let customMapView = self.customWebView?.customMapViews[mapId] else {
+                call.reject("map not found")
+                return
+            }
+
+            let bounds = customMapView.GMapView.projection.visibleRegion();
+
+            call.resolve([
+                "bounds":[
+                    "farLeft": [
+                        "latitude": bounds.farLeft.latitude as Any,
+                        "longitude": bounds.farLeft.longitude as Any
+                    ],
+                    "farRight":[
+                        "latitude": bounds.farRight.latitude as Any,
+                        "longitude": bounds.farRight.longitude as Any
+                    ],
+                    "nearLeft":[
+                        "latitude": bounds.nearLeft.latitude as Any,
+                        "longitude": bounds.nearLeft.longitude as Any
+                    ],
+                    "nearRight":[
+                        "latitude": bounds.nearRight.latitude as Any,
+                        "longitude": bounds.nearRight.longitude as Any
+                    ]
+                ]
+            ])
+        }
+    }
+
     func setCallbackIdForEvent(call: CAPPluginCall, eventName: String) {
         let mapId: String = call.getString("mapId", "")
 

src/definitions.ts

@@ -16,6 +16,7 @@ import {
   AddMarkersOptions,
   AddMarkersResult,
   RemoveMarkerOptions,
+  ViewBoundsOptions,
   // events
   DidTapInfoWindowCallback,
   DidCloseInfoWindowCallback,
@@ -71,6 +72,8 @@ export interface CapacitorGoogleMapsPlugin {
 
   removeMarker(options: RemoveMarkerOptions): Promise<void>;
 
+  viewBounds(options: ViewBoundsOptions): Promise<any>;
+
   didTapInfoWindow(
     options: DefaultEventOptions,
     callback: DidTapInfoWindowCallback

src/interfaces/index.ts

@@ -9,6 +9,7 @@ export { ElementFromPointResultOptions } from "./methods/ElementFromPointResult"
 export { AddMarkerOptions, AddMarkerResult } from "./methods/AddMarker";
 export { AddMarkersOptions, MarkerInputEntry, AddMarkersResult } from "./methods/AddMarkers";
 export { RemoveMarkerOptions } from "./methods/RemoveMarker";
+export { ViewBoundsOptions } from './methods/ViewBounds';
 
 // events
 export * from "./events/DidTapInfoWindow";

src/interfaces/methods/ViewBounds.ts

@@ -0,0 +1,8 @@
+export interface ViewBoundsOptions {
+  /**
+   * The identifier of the map to which this method should be applied.
+   *
+   * @since 2.0.0
+   */
+  mapId: string;
+}

src/web.ts

@@ -13,6 +13,7 @@ import {
   MoveCameraOptions,
   ElementFromPointResultOptions,
   AddMarkerOptions,
+  ViewBoundsOptions,
   AddMarkerResult,
   AddMarkersOptions,
   AddMarkersResult,
@@ -82,6 +83,10 @@ export class CapacitorGoogleMapsWeb
     throw this.unimplemented("Not implemented on web.");
   }
 
+  async viewBounds(_options: ViewBoundsOptions): Promise<any> {
+    throw new Error('Method not implemented on web.');
+  }
+
   async didTapInfoWindow(
     _options: DefaultEventOptions,
     _callback: DidTapInfoWindowCallback