prs/prs.mobile/comal.timesheets/BarcodeForm.xaml.cs

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Comal.Classes;
using InABox.Core;
using Rb.Forms.Barcode.Pcl;
using Xamarin.Forms;

namespace comal.timesheets
{
    public partial class BarcodeForm : ContentPage
    {
        public Guid JobID { get; set; }

        public double Latitude { get; set; }
        public double Longitude { get; set; }

        private DataTable Jobs = null;

        public BarcodeForm(DataTable jobs)
        {
            InitializeComponent();

            Jobs = jobs;

            MessagingCenter.Subscribe<App>(this, App.MessageOnSleep, disableScanner);
            MessagingCenter.Subscribe<App>(this, App.MessageOnResume, enableScanner);

            barcodeScanner.BarcodeChanged += animateFlash;
        }

        protected override void OnAppearing()
        {
            base.OnAppearing();
            enableScanner(this);
        }

        protected override void OnDisappearing()
        {
            disableScanner(this);
            base.OnDisappearing();
        }

        //public void DisableScanner()
        //{
        //    disableScanner(null);
        //}


        private void disableScanner(object sender)
        {
            barcodeScanner.IsEnabled = false;
        }

        private void enableScanner(object sender)
        {
            barcodeScanner.IsEnabled = true;
        }

        private async Task ProcessBarcode(String barcode)
        {
            disableScanner(this);

            JobID = Guid.Empty;
            foreach (DataRow row in Jobs.Rows)
            {
                Guid jobid = row.Get<Job, Guid>(X => X.ID);
                if (jobid.ToString().Equals(barcode))
                {
                    JobID = jobid;
                    Latitude = row.Get<Job, double>(X => X.SiteAddress.Location.Latitude);
                    Longitude = row.Get<Job, double>(X => X.SiteAddress.Location.Longitude);
                    break;
                }
            }
            if (JobID != Guid.Empty)
                Navigation.PopAsync();
            else
                enableScanner(this);
        }

        private async void animateFlash(object sender, BarcodeEventArgs e)
        {
            Device.BeginInvokeOnMainThread(async () =>
            {
                await flash.FadeTo(1, 150, Easing.CubicInOut);
                flash.Opacity = 0;
                await ProcessBarcode(e.Barcode.Result);


            });
        }

        ~BarcodeForm()
        {
            disableScanner(this);

            MessagingCenter.Unsubscribe<App>(this, App.MessageOnSleep);
            MessagingCenter.Unsubscribe<App>(this, App.MessageOnResume);

            barcodeScanner.BarcodeChanged -= animateFlash;
        }
    }
}