CaritasPWA/Shared/Services/PermissionsProvider.cs

using Microsoft.JSInterop;
using System;
using System.Threading.Tasks;

namespace cwebplusApp.Shared.Services {

    public class PermissionsProvider {

        private bool _isGeoLocationAllowed;

        public delegate void GeoLocationPermissionChangeCallBack();
        private GeoLocationPermissionChangeCallBack _geoLocationPermissionChangeCallBack;

        public IJSRuntime JSRuntime { get; set; }

        public bool IsGeoLocationAllowed {
            get { return _isGeoLocationAllowed; }
            set { _isGeoLocationAllowed = value; }
        }

        public PermissionsProvider(IJSRuntime _jSRuntime) {
            this.JSRuntime = _jSRuntime;
            initialize();
        }

        [JSInvokable]
        public void GeoLocationPermissionChanged(string geoLocationStatus) {
            IsGeoLocationAllowed = (geoLocationStatus.Equals("granted") || geoLocationStatus.Equals("prompt")) ? true : false;
            _geoLocationPermissionChangeCallBack();
        }

        public void SetGeoLocationPermissionChangeCallBack(GeoLocationPermissionChangeCallBack callback) {
            _geoLocationPermissionChangeCallBack = callback;
        }

        public void RemoveOnlineStatusChangeCallBack() {
            _geoLocationPermissionChangeCallBack = null;
        }


        private async void initialize() {
            await GeoLocationAllowed();
        }

        private async Task<bool> GeoLocationAllowed() {
            var dotNetObjRef = DotNetObjectReference.Create(this);
            string result = await JSRuntime.InvokeAsync<string>("IsGeoLocationAllowed", dotNetObjRef);
            this.IsGeoLocationAllowed = result.Equals("granted") || result.Equals("prompt");
            return IsGeoLocationAllowed;
        }

    }
}