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﻿//-----------------------------------------------------------------------
// <copyright file="TransparentRichTextBox.cs" company="NoteFly">
//  NoteFly a note application.
//  Copyright (C) 2011-2012  Tom
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
// </copyright>
//-----------------------------------------------------------------------
namespace NoteFly
    using System;
    using System.Runtime.InteropServices;
    using System.Windows.Forms;
    /// <summary>
    /// A transparent version of the RichTextBox control.
    /// </summary>
    public class TransparentRichTextBox : RichTextBox
        /// <summary>
        /// Override createParams to add support for a transparant background image.
        /// </summary>
        protected override CreateParams CreateParams
                CreateParams prams = base.CreateParams;
                if (Settings.NotesTransparentRTB)
                    if (Program.CurrentOS == Program.OS.WINDOWS)
                        if (LoadLibrary("msftedit.dll") != IntPtr.Zero)
                            prams.ExStyle |= 0x020; // transparent
                            prams.ClassName = "RICHEDIT50W";
                return prams;
        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        private static extern IntPtr LoadLibrary(string lpFileName);

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TransparentRichTextBox.cs

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