prs/prs.mobile.new/PRS.Mobile/Components/DigitalForms/Editor/CustomUserControls/SignatureSaver.xaml.cs

using Comal.Classes;
using InABox.Clients;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace PRS.Mobile
{
	[XamlCompilation(XamlCompilationOptions.Compile)]
	public partial class SignatureSaver 
	{
        public delegate void SignatureSaved();
        public event SignatureSaved OnSignatureSaved;
		public SignatureSaver ()
		{
			InitializeComponent ();
		}

		void Save_Clicked(object sender, EventArgs e)
		{
            signaturePad.Save();
            if (signaturePad.ImageSource != null)
            {
                string base64 = ImageSourceToBase64(signaturePad.ImageSource);
                byte[] data = Convert.FromBase64String(base64);

                try
                {
                    Employee employee = new Employee { ID = App.Data.Me.ID };
                    employee.Signature = data;
                    new Client<Employee>().Save(employee, "Signature Saved from mobile");
                }
                catch
                { 
                
                }
                if (Application.Current.Properties.ContainsKey("SavedSignature"))
                {
                    Application.Current.Properties["SavedSignature"] = data;
                }
                else
                {
                    Application.Current.Properties.Add("SavedSignature", data);
                }
            }
            OnSignatureSaved?.Invoke();
            Navigation.PopAsync();
        }

		void Clear_Clicked(object sender, EventArgs e)
		{
			signaturePad.Clear();
		}

        void DeleteSaved_Clicked(object sender, EventArgs e)
        {
            try
            {
                Employee employee = new Employee { ID = App.Data.Me.ID };
                employee.Signature = null;
                new Client<Employee>().Save(employee, "Signature Saved from mobile");
                DisplayAlert("Success", "Signature deleted for Employee", "OK");
            }
            catch
            {

            }
        }

        private string ImageSourceToBase64(ImageSource source)
        {
            StreamImageSource streamImageSource = (StreamImageSource)source;
            System.Threading.CancellationToken cancellationToken = System.Threading.CancellationToken.None;
            Task<Stream> task = streamImageSource.Stream(cancellationToken);
            Stream stream = task.Result;
            byte[] bytes = new byte[stream.Length];
            stream.Read(bytes, 0, bytes.Length);
            string s = Convert.ToBase64String(bytes, Base64FormattingOptions.InsertLineBreaks);
            return s;
        }
    }
}