/*=============================================================================

  Project:   SharpImage
  Module:    siOpenImageDialog.cs
  Language:  C#
  Author:    Dan Mueller
  Date:      $Date: 2007-07-06 10:57:00 +1000 (Fri, 06 Jul 2007) $
  Revision:  $Revision: 2 $

  Copyright (c) Queensland University of Technology (QUT) 2007.
  All rights reserved.

  This software is distributed WITHOUT ANY WARRANTY; without even
  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  PURPOSE.  See the above copyright notices for more information.
  
=============================================================================*/

using System;
using System.Data;
using System.Text;
using System.Drawing;
using System.ComponentModel;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Runtime.InteropServices;

namespace SharpImage.Main
{
    class siOpenImageDialog : siImageDialog
    {
        #region Construction and Disposal
        //=====================================================================
        public siOpenImageDialog()
        {
            this.m_Title = "Open image";
        }
        //=====================================================================
        #endregion

        #region Public Methods
        //=====================================================================
        /// <summary>
        /// Show the dialog.
        /// </summary>
        /// <param name="parent">The parent form.</param>
        /// <returns></returns>
        public override DialogResult ShowDialog(Form parent)
        {
            // Create OFN struct and populate
            OPENFILENAME ofn = new OPENFILENAME();
            ofn.lStructSize = Marshal.SizeOf(ofn);
            ofn.lpstrFilter = this.Filter.Replace('|', '\0') + '\0';
            ofn.nFilterIndex = this.FilterIndex;
            ofn.lpstrFile = this.FileName + new string(' ', 512);
            ofn.nMaxFile = ofn.lpstrFile.Length;
            ofn.lpstrFileTitle = System.IO.Path.GetFileName(this.FileName) + new string(' ', 512);
            ofn.nMaxFileTitle = ofn.lpstrFileTitle.Length;
            ofn.lpstrTitle = this.Title;
            ofn.lpstrDefExt = this.DefaultExt;
            ofn.hwndOwner = parent.Handle;

            // Set the parent
            this.m_Parent = parent;

            // Set flags
            // TODO: enable user to set these
            ofn.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST | OFN_NOTESTFILECREATE | OFN_HIDEREADONLY | OFN_ENABLEHOOK;

            // Set hook using delegate as C function ptr
            ofn.lpfnHook = new OFNHookProcDelegate(this.HookProc);

            // Show the dialog
            if (!GetOpenFileName(ref ofn))
            {
                int ret = CommDlgExtendedError();
                if (ret != 0)
                    throw new ApplicationException("Could not show dialog. Error code:" + ret.ToString());
                return DialogResult.Cancel;
            }

            // Save the filename and return
            this.FileName = ofn.lpstrFile;
            return DialogResult.OK;
        }
        //=====================================================================
        #endregion
    }
}