using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;

namespace Sheas_Cealer
{
    //定义IconRemover
    internal static class IconRemover
    {
        private const int GWL_EXSTYLE = -20;
        private const int WS_EX_DLGMODALFRAME = 0x0001;
        private const int SWP_NOSIZE = 0x0001;
        private const int SWP_NOMOVE = 0x0002;
        private const int SWP_NOZORDER = 0x0004;
        private const int SWP_FRAMECHANGED = 0x0020;
        private const uint WM_SETICON = 0x0080;

        [DllImport("user32.dll")]
        private static extern int GetWindowLong(IntPtr hwnd, int index);
        [DllImport("user32.dll")]
        private static extern int SetWindowLong(IntPtr hwnd, int index, int newStyle);
        [DllImport("user32.dll")]
        private static extern bool SetWindowPos(IntPtr hwnd, IntPtr hwndInsertAfter, int x, int y, int width, int height, uint flags);
        [DllImport("user32.dll")]
        private static extern IntPtr SendMessage(IntPtr hwnd, uint msg, IntPtr wParam, IntPtr lParam);

        internal static void RemoveIcon(Window window)
        {
            //获取该窗口句柄
            IntPtr hwnd = new WindowInteropHelper(window).Handle;

            //将窗口更改为不显示窗口图标
            _ = SetWindowLong(hwnd, GWL_EXSTYLE, GetWindowLong(hwnd, GWL_EXSTYLE) | WS_EX_DLGMODALFRAME);

            //更新窗口的非客户区域来显示更改
            SetWindowPos(hwnd, IntPtr.Zero, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED);

            //防止自定义图标生效
            SendMessage(hwnd, WM_SETICON, new IntPtr(1), IntPtr.Zero);
            SendMessage(hwnd, WM_SETICON, IntPtr.Zero, IntPtr.Zero);
        }
    }

    //使用IconRemover
    public partial class MainWindow
    {
        protected override void OnSourceInitialized(EventArgs e)
        {
            IconRemover.RemoveIcon(this);
        }
    }
    public partial class AboutWindow
    {
        protected override void OnSourceInitialized(EventArgs e)
        {
            IconRemover.RemoveIcon(this);
        }
    }
}