using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace CsvView
{
    public class DoubleBufferPanel : Panel
    {
        public DoubleBufferPanel()
        {
            DoubleBuffered = true;
            SetStyle(ControlStyles.UserPaint |
                          ControlStyles.AllPaintingInWmPaint |
                          ControlStyles.ResizeRedraw |
                          ControlStyles.ContainerControl |
                          ControlStyles.OptimizedDoubleBuffer |
                          ControlStyles.SupportsTransparentBackColor
                          , true);
        }


        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int SendMessage(IntPtr hWnd, Int32 wMsg, bool wParam, Int32 lParam);

        private const int WM_SetRedraw = 0XB;

        public void SuspendDrawing()
        {
            SuspendLayout();
            SendMessage(Handle, WM_SetRedraw, false, 0);
        }

        public void ResumeDrawing()
        {
            ResumeLayout(true);
            SendMessage(Handle, WM_SetRedraw, true, 0);
            Refresh();
        }

    }
}