WIP signing

BookAStar/BookAStar/Views/MDSigningView.xaml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
+             x:Class="BookAStar.Views.MDSigningView"
+             xmlns:signature="clr-namespace:SignaturePad.Forms;assembly=SignaturePad.Forms"
+             xmlns:views="clr-namespace:BookAStar.Views;assembly=BookAStar">
+  <ContentView.Content>
+    <views:MarkdownView Markdown="{Binging Doc}" Editable="false" />
+    <signature:SignaturePadView x:Name="padView"
+                                HeightRequest="150" WidthRequest="240"
+                                BackgroundColor="White"
+                                CaptionText="Caption This" CaptionTextColor="Black"
+                                ClearText="Efface moi!" ClearTextColor="Red"
+                                PromptText="Prompt Here" PromptTextColor="Red"
+                                SignatureLineColor="Aqua" StrokeColor="Black" StrokeWidth="2" />
+    <Button Clicked="OnChangeTheme" Text="Changer le Theme" />
+    <Button Clicked="OnGetStats" Text="Obtenir les stats de la signature " />
+  </ContentView.Content>
+</ContentView>

BookAStar/BookAStar/Views/MDSigningView.xaml.cs

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+using SignaturePad.Forms;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using Xamarin.Forms;
+
+namespace BookAStar.Views
+{
+    public partial class MDSigningView : ContentView
+    {
+        public MDSigningView()
+        {
+            InitializeComponent();
+        }
+
+        private async void OnChangeTheme(object sender, EventArgs e)
+        {
+            var action = await App.DisplayActionSheet( 
+                "Change Theme", "Cancel", null,
+                new string[] { "White", "Black", "Aqua" } );
+            switch (action)
+            {
+                case "White":
+                    padView.BackgroundColor = Color.White;
+                    padView.StrokeColor = Color.Black;
+                    padView.ClearTextColor = Color.Black;
+                    padView.ClearText = "Clear Markers";
+                    break;
+
+                case "Black":
+                    padView.BackgroundColor = Color.Black;
+                    padView.StrokeColor = Color.White;
+                    padView.ClearTextColor = Color.White;
+                    padView.ClearText = "Clear Chalk";
+                    break;
+
+                case "Aqua":
+                    padView.BackgroundColor = Color.Aqua;
+                    padView.StrokeColor = Color.Red;
+                    padView.ClearTextColor = Color.Black;
+                    padView.ClearText = "Clear The Aqua";
+                    break;
+            }
+        }
+
+        private async void OnGetStats(object sender, EventArgs e)
+        {
+            var points = padView.Points.ToArray();
+            var image = await padView.GetImageStreamAsync(SignatureImageFormat.Png);
+
+            var pointCount = points.Count();
+            var imageSize = image.Length / 1000;
+            var linesCount = points.Count(p => p == Point.Zero) + (points.Length > 0 ? 1 : 0);
+
+            image.Dispose();
+
+            await App.DisplayAlert("Stats", $"The signature has {linesCount} lines or {pointCount} points, and is {imageSize:#,###.0}KB (in memory) when saved as a PNG.", "Cool");
+        }
+    }
+}