Silver Draw - A Silverlight Based Collaboration White Board with Drawing and Chat

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.ComponentModel;
using System.Windows.Controls.Primitives;
using System.Windows.Browser;
using System.Windows.Markup;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Globalization;
using System.Text;
using System.Collections.ObjectModel;
using Silverdraw.Server;


namespace Silverdraw.Client
{
    public partial class Page : UserControl
    {

        #region Private

        bool drawing = false;
        DrawingArea drawArea;
        DuplexClientHelper<DrawData> proxy ;
        string userName=string.Empty;
       #endregion

        #region Ctor and Methods

        public Page()
        {
            InitializeComponent();
            drawArea = new DrawingArea(this.DrawingCanvas);
            drawArea.Tool = CurrentTool.Pencil;
            drawArea.StrokeColor = new SolidColorBrush(Colors.Gray);
            drawArea.FillColor = new SolidColorBrush(Colors.Red);
            drawArea.StrokeWidth = 5;
            this.DataContext = drawArea;

            drawArea.DataAdded += (data) =>
                {
                    try
                    {
                        proxy.Client.DrawAsync(data); 
                    }
                    catch { }
                };
        }


         /// <summary>
        /// Initialize the connection
        /// </summary>
        void InitServiceConnection()
        {
            proxy = new DuplexClientHelper<DrawData>();
            string endPointAddress =  "http://"
              + App.Current.Host.Source.DnsSafeHost
              + ":"
              + App.Current.Host.Source.Port.ToString(CultureInfo.InvariantCulture)
              + "/DuplexDrawService.svc";

                //"http://localhost:2632/DuplexDrawService.svc";

            proxy.GotNotification += (operation, data) =>
                {
                    if (data != null)
                    {
                        if (data.Content.StartsWith("@draw:"))
                        {
                            if (data.From != userName)
                            {
                                drawArea.AddObjects(data.Content.Substring("@draw:".Length), data.From);
                                ShowNotification(data.From + " has drawn something");
                            }
                        }
                        else if (data.Content.StartsWith("@added:"))
                        {
                            ShowNotification(data.Content.Substring("@added:".Length) + " Joined");
                        }
                    }
                };

            proxy.GotError += (operation, data) => ShowNotification("Error:" + data.Message);
            proxy.Initialize(endPointAddress);
            proxy.Client.RegisterAsync(this.InputUser.Text);
        }

        /// <summary>
        /// Shows a notification from server
        /// </summary>
        /// <param name="data"></param>
        public void ShowNotification(string data)
        {
            Notification.Text = "Notification: " + data;
        }


        #endregion

        #region Events

        private void ButtonSelect_Click(object sender, RoutedEventArgs e)
        {
            this.ColorPanel.Visibility = Visibility.Collapsed;
        }

        private void ButtonTool_Click(object sender, RoutedEventArgs e)
        {
            var btn=sender as Button;

            if (btn != null && btn.Tag is string)
            {
                drawArea.Tool=(CurrentTool)Enum.Parse(typeof(CurrentTool),btn.Tag as string,true); 
            }
        }

        private void DrawingCanvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            drawArea.PrevPoint  = e.GetPosition(this.DrawingCanvas);
            drawArea.StartPoint = drawArea.PrevPoint;
            drawArea.TempHolder.Clear();

            if (drawing)
                drawing = false;
            else
            {
                drawing = true;
                var cupt = e.GetPosition(this.DrawingCanvas);
                e.Handled = true;
            }

        }

        private void DrawingCanvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            drawing = false;
            var cupt = e.GetPosition(this.DrawingCanvas);
            drawArea.HideVirtualLine();

            cupt = drawArea.DrawOnComplete(cupt);

        }

        private void DrawingCanvas_MouseMove(object sender, MouseEventArgs e)
        {
            if (drawing && drawArea.PrevPoint != null)
            {
                var cupt = e.GetPosition(this.DrawingCanvas);
                cupt = drawArea.DrawOnMove(cupt);
            }

        }

        private void ButtonLogin_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                InitServiceConnection();
                drawArea.MessageCollection.Clear();
                this.DrawingCanvas.Children.Clear();
                this.userName = InputUser.Text;
            }
            catch (Exception ex)
            {
                MessageBox.Show("Unable to connect: " + ex.Message + ". Continuing with out connecting to server!!","Can't Connect",MessageBoxButton.OK);
                UpdateButton.IsEnabled = false;
            }

            this.LayoutRoot.Visibility = Visibility.Visible;
            this.LoginPanel.Visibility = Visibility.Collapsed;
        }
        
        private void UpdateButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                var txt = this.TalkText.Text;
                this.TalkText.Text = string.Empty;
                var talk = new ScreenObject() { Text = txt, Type = ScreenObjectType.Text };
                drawArea.MessageCollection.Insert(0, new TalkItem()
                {
                    Text = talk.Text,
                    Time = DateTime.Now.ToShortTimeString(),
                    From = "Me"
                });
                var obj = new ScreenObject[] { talk };
                proxy.Client.DrawAsync(obj.JsonSerialize());
            }
            catch { }
        }

        private void ButtonColor_Click(object sender, MouseButtonEventArgs e)
        {
            if (sender is Canvas)
            {
                this.ColorPanel.Visibility = Visibility.Visible;
                ColorPanel.Tag = sender;
                ColorPicker.ColorChanged += (s, c) =>
                {
                    (ColorPanel.Tag as Canvas).Background = c.newColor;
                };
            }
        }

        private void ButtonVideo_Click(object sender, RoutedEventArgs e)
        {
            HtmlPage.PopupWindow(new Uri(@"http://amazedsaint.blogspot.com/2009/11/silverlight-wcf-duplex-services.html"), "_blank", null); 
        }

        #endregion

       

       
    }
}