Developing Next Generation Smart Clients using .NET 2.0 working with Existing .NET 1.1 SOA-based XML Web Services

#region Using directives

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using SmartInstitute.Automation.Commands.Framework;
using SmartInstitute.Client.Automation.Commands.Security;
using SmartInstitute.Client.Automation;
using System.Reflection;

#endregion

namespace SmartInstitute.Client.Forms
{
	partial class LoginScreen : Form
	{
		private Color DarkBlue = Color.FromArgb(255, 0, 48, 156);
		private Color LightBlue = Color.FromArgb(255, 90, 126, 220);

		public LoginScreen()
		{
			InitializeComponent();

			this.ResizePanels();

			this.lblServer.Text = _Application.Settings.WebServiceUrl;

			Version version = Assembly.GetExecutingAssembly().GetName().Version;

			this.lblServer.Text += " " + version.ToString();
		}

		private void pnlCenter_Paint(object sender, PaintEventArgs e)
		{
			Color gradientEnd = Color.FromArgb(95, Color.White);
			Color gradientStart = Color.FromArgb(10, Color.White);

			// Draw the vertical separator at the middle

			// First half of the separator
			Rectangle rect = new Rectangle((this.pnlCenter.ClientRectangle.Width / 2) - 2, 10, 1, (this.pnlCenter.ClientRectangle.Height / 2) - 10);
			using (LinearGradientBrush brush = new LinearGradientBrush(rect, gradientStart, gradientEnd, 90))
			{
				e.Graphics.FillRectangle(brush, rect);
			}

			// Second half of the separator
			rect.Offset(0, (this.pnlCenter.ClientRectangle.Height / 2) - 10);
			using (LinearGradientBrush brush = new LinearGradientBrush(rect, gradientEnd, gradientStart, 90))
			{
				e.Graphics.FillRectangle(brush, rect);
			}

			// Draw the top and bottom gradient bars

			// left half
			Rectangle rectHorizontal = new Rectangle(0, 0, this.pnlCenter.ClientRectangle.Width / 2, 2);

			// right half
			Rectangle rectHorizontal2 = rectHorizontal;
			rectHorizontal2.Offset(this.pnlCenter.ClientRectangle.Width / 2, 0);

			// draw left half on top and bottom
			using (LinearGradientBrush brush = new LinearGradientBrush(rectHorizontal, gradientStart, gradientEnd, 0f))
			{
				e.Graphics.FillRectangle(brush, rectHorizontal);

				rectHorizontal.Offset(0, this.pnlCenter.ClientRectangle.Height - 2);
				e.Graphics.FillRectangle(brush, rectHorizontal);
			}

			// draw right half on top and bottom
			using (LinearGradientBrush brush = new LinearGradientBrush(rectHorizontal, gradientEnd, gradientStart, 0f))
			{
				e.Graphics.FillRectangle(brush, rectHorizontal2);

				rectHorizontal2.Offset(0, this.pnlCenter.ClientRectangle.Height - 2);
				e.Graphics.FillRectangle(brush, rectHorizontal2);
			}

		}

		private void linkClose_Click(object sender, EventArgs e)
		{
			this.Close();
		}

		private void pnlCenter_Resize(object sender, EventArgs e)
		{
			this.ResizePanels();
		}

		private void ResizePanels()
		{
			this.Invalidate();

			int centerX = (this.pnlCenter.ClientRectangle.Width / 2);

			// the logo is left to the center
			this.pnlLogo.Left = centerX - this.pnlLogo.Width - 10;

			// the login box is righ to the center
			this.pnlLogin.SetBounds(centerX + 10, this.pnlLogin.Top, this.pnlCenter.ClientRectangle.Width - centerX - 10, this.pnlLogin.Height);
		}

		/// <summary>
		/// Start login process
		/// </summary>
		private void Login()
		{
			string[] credential = new string[] { txtUserName.Text, txtPassword.Text };

			lblProgress.Visible = true;
			lblProgress.Refresh();

			loginProgress.Visible = true;
			loginProgress.Value = loginProgress.Minimum;

			worker.RunWorkerAsync(credential);
		}

		private void btnOK_Click(object sender, EventArgs e)
		{
			this.Login();
		}

		/// <summary>
		/// Call web service and validate credentials
		/// </summary>
		/// <param name="userName"></param>
		/// <param name="password"></param>
		/// <returns></returns>
		private void Authenticate(string userName, string password)
		{
			AuthenticateCommand command = new AuthenticateCommand(userName, password);
			((ICommand)command).Execute();

			worker.ReportProgress(1, "Loading...");
		}

		protected override void OnPaint(PaintEventArgs e)
		{
			base.OnPaint(e);

			e.Graphics.DrawImage(SmartInstitute.App.Properties.Resources.RightArrow, 0, 0);

			if (base.Focused)
			{
				e.Graphics.DrawRectangle(Pens.Yellow, e.ClipRectangle);
			}
		}

		private void worker_DoWork(object sender, DoWorkEventArgs e)
		{
			// This method will run on a thread other than the UI thread.
			// Be sure not to manipulate any Windows Forms controls created
			// on the UI thread from this method.

			string[] credential = (string[])e.Argument;
			string userName = credential[0];
			string password = credential[1];

			this.Authenticate(userName, password);
	}

		private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
		{
			lblProgress.Text = (string)e.UserState;
			lblProgress.Refresh();
		}

		private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
		{
			if (null != e.Error)
			{
				MessageBox.Show(this, e.Error.Message, "Login Problem", 
					MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
			}
			else
			{
				this.DialogResult = DialogResult.OK;
				this.Close();
			}

			lblProgress.Visible = loginProgress.Visible = false;
		}

		private void LoginScreen_Load(object sender, EventArgs e)
		{
			txtUserName.Focus();
		}
	}
}