Silverlight Database Deep Zoom

//
// This source code is licensed for commercial and non-commercial use under the 
// Code Project Open License (CPOL) 1.02  http://www.codeproject.com/info/cpol10.aspx
// Developer: Joerg Lang (lang.joerg@gmail.com)
//
using System;
using System.Data.OleDb;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using DatabaseDeepZoom.Properties;
using DbDzComposer;

namespace DatabaseDeepZoom
{
    public partial class MainForm : Form
    {
        private readonly DeepZoomGenerator dz;

        /// <summary>
        /// Initializes a new instance of the <see cref="MainForm"/> class.
        /// </summary>
        public MainForm()
        {
            InitializeComponent();

            // Create the DeepZoom generator object and pass it the Access persister object
            dz = new DeepZoomGenerator {DatabasePersister = GetAccessDb()};
            // Attach the event handler, so we can watch the creation progress
            dz.CreationProgress += dz_CreationProgress;
        }


        /// <summary>
        /// Handles the CreationProgress event of the DeepZoomCreator object.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="DbDzComposer.DeepZoomCreationProgressEventArgs"/> instance containing the event data.</param>
        private void dz_CreationProgress(object sender, DeepZoomCreationProgressEventArgs e)
        {
            progressBar.Value = e.CreationProgress;
            Application.DoEvents();
        }

        /// <summary>
        /// Handles the Click event of the cmdCreate control.
        /// Creates the tiles for the selected image
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
        private void cmdCreate_Click(object sender, EventArgs e)
        {
            // Check if input exists
            if (txtName.Text.Length == 0 || txtFile.Text.Length == 0)
                return;

            // If the file exists start processing
            if (File.Exists(txtFile.Text))
            {
                // Init the progress bar
                this.Cursor = Cursors.WaitCursor;
                progressBar.Value = 0;
                progressBar.Visible = true;

                // Generate the tile
                dz.GenerateFromFile(txtFile.Text, txtName.Text, true, true);

                // Reset the progress bar
                progressBar.Visible = false;
                this.Cursor = Cursors.Default;
            }
        }

        /// <summary>
        /// Handles the Click event of the cmdFileOpen control.
        /// Opens the file open dialog and lets the user choose a file
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
        private void cmdFileOpen_Click(object sender, EventArgs e)
        {
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                txtFile.Text = ofd.FileName;
                txtName.Text = new FileInfo(ofd.FileName).Name;

                // Assign the image to the image preview 
                previewImage.Image = new Bitmap(ofd.FileName);
                previewImage.SizeMode = PictureBoxSizeMode.Zoom;
            }
        }


        /// <summary>
        /// Returns DeepZoom Database data access object for the Access database.
        /// </summary>
        /// <returns></returns>
        private DzDbAccess GetAccessDb()
        {
            // Read connection string from the property settings and open the database
            string connectString = Settings.Default.ConnectionString;
            var cn = new OleDbConnection(connectString);
            cn.Open();

            // Create the MS Access database object and pass it the connection object.
            var accessPersistence = new DzDbAccess();
            accessPersistence.DbConnection = cn;
            return accessPersistence;
        }
    }
}