namespace FlashWindowApi
{
    using System;
    using System.Runtime.InteropServices;
    using System.Windows.Forms;
 
    [StructLayout(LayoutKind.Sequential)]
    public struct FlashWinInfo
    {
        public uint Size;
        public IntPtr Handle;
        public FlashWinFlags Flags;
        public uint Count;
        public uint Timeout;
    }
 
    [Flags]
    public enum FlashWinFlags : uint
    {
        FlashStop = 0x0000,
        FlashCaption = 0x0001,
        FlashTray = 0x0002,
        FlashAll = 0x0003,
        FlashTimer = 0x0004,
        FlashTimerNoForeground = 0x000c,
    }
 
    public static class FlashWindowManager
    {
        public static void FlashWindow(
            IntPtr winHandle,
            FlashWinFlags flags = FlashWinFlags.FlashAll,
            int count = int.MaxValue,
            int timeout = 0)
        {
            var flashWinInfo = new FlashWinInfo();
            flashWinInfo.Size = (uint)Marshal.SizeOf(flashWinInfo);
 
            flashWinInfo.Handle = winHandle;
            flashWinInfo.Flags = flags;
            flashWinInfo.Count = (uint)count;
            flashWinInfo.Timeout = (uint)timeout;
 
            FlashWindowEx(ref flashWinInfo);
        }
 
        public static void FlashWindow(
            this Form form, 
            FlashWinFlags flags = FlashWinFlags.FlashAll,
            int count = int.MaxValue, 
            int timeout = 0)
        {
            FlashWindow(form.Handle, flags, count, timeout);
        }
 
        public static void FlashStop(IntPtr winHandle)
        {
            FlashWindow(winHandle, FlashWinFlags.FlashStop);
        }
 
        public static void FlashStop(this Form form)
        {
            FlashStop(form.Handle);
        }
 
        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool FlashWindowEx(
            ref FlashWinInfo flashWinInfo);
    }
}