NativeMethods.cs

using System;
using System.Runtime.InteropServices;

namespace Yotepad
{
    internal static class NativeMethods
    {
        [DllImport("dwmapi.dll")]
        public static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);

        public const int DWMWA_USE_IMMERSIVE_DARK_MODE = 20;

        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool DestroyIcon(IntPtr hIcon);

        [DllImport("uxtheme.dll", CharSet = CharSet.Unicode)]
        public static extern int SetWindowTheme(IntPtr hWnd, string pszSubAppName, string? pszSubIdList);

        [DllImport("uxtheme.dll", EntryPoint = "#135")]
        public static extern int SetPreferredAppMode(int preferredAppMode);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool CreateCaret(IntPtr hWnd, IntPtr hBitmap, int nWidth, int nHeight);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool ShowCaret(IntPtr hWnd);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool DestroyCaret();
        
    }
}