SteamTools/System.Application.SteamTools.Client.Desktop.Platform.Windows/Implementation/WindowsDesktopPlatformServiceImpl.cs

using System.Runtime.InteropServices;
using System.Runtime.Versioning;

namespace System.Application.Services.Implementation
{
    [SupportedOSPlatform("Windows")]
    internal sealed class WindowsDesktopPlatformServiceImpl : IDesktopPlatformService
    {
        #region 窗口右上角的三个按钮(最小化，最大化，关闭)

        // https://stackoverflow.com/questions/339620/how-do-i-remove-minimize-and-maximize-from-a-resizable-window-in-wpf
        // https://blog.magnusmontin.net/2014/11/30/disabling-or-hiding-the-minimize-maximize-or-close-button-of-a-wpf-window/

        public const int MF_BYCOMMAND = 0x00000000;
        public const int SC_CLOSE = 0xF060;
        public const int SC_MINIMIZE = 0xF020;
        public const int SC_MAXIMIZE = 0xF030;

        [DllImport("user32.dll")]
        public static extern int DeleteMenu(IntPtr hMenu, int nPosition, int wFlags);

        [DllImport("user32.dll")]
        public static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

        public const int GWL_STYLE = -16,
                    WS_MAXIMIZEBOX = 0x10000,
                    WS_MINIMIZEBOX = 0x20000;

        [DllImport("user32.dll")]
        public extern static int GetWindowLong(IntPtr hwnd, int index);

        [DllImport("user32.dll")]
        public extern static int SetWindowLong(IntPtr hwnd, int index, int value);

        public const int WS_SYSMENU = 0x80000;

        public static void EnableMinimizeButton(IntPtr hWnd)
        {
            _ = SetWindowLong(hWnd, GWL_STYLE, GetWindowLong(hWnd, GWL_STYLE) | WS_MINIMIZEBOX);
        }

        public static void EnableMaximizeButton(IntPtr hWnd)
        {
            _ = SetWindowLong(hWnd, GWL_STYLE, GetWindowLong(hWnd, GWL_STYLE) | WS_MAXIMIZEBOX);
        }

        public static void ShowMinimizeAndMaximizeButtons(IntPtr hWnd)
        {
            _ = SetWindowLong(hWnd, GWL_STYLE, GetWindowLong(hWnd, GWL_STYLE) | WS_MAXIMIZEBOX | WS_MINIMIZEBOX);
        }

        public static void ShowAllButtons(IntPtr hWnd)
        {
            _ = SetWindowLong(hWnd, GWL_STYLE, GetWindowLong(hWnd, GWL_STYLE) | WS_SYSMENU);
        }

        public static void HideMinimizeAndMaximizeButtons(IntPtr hWnd)
        {
            _ = SetWindowLong(hWnd, GWL_STYLE, GetWindowLong(hWnd, GWL_STYLE) & ~WS_MAXIMIZEBOX & ~WS_MINIMIZEBOX);
        }

        public static void DisableMinimizeButton(IntPtr hWnd)
        {
            _ = SetWindowLong(hWnd, GWL_STYLE, GetWindowLong(hWnd, GWL_STYLE) & ~WS_MINIMIZEBOX);
        }

        public static void DisableMaximizeButton(IntPtr hWnd)
        {
            _ = SetWindowLong(hWnd, GWL_STYLE, GetWindowLong(hWnd, GWL_STYLE) & ~WS_MAXIMIZEBOX);
        }

        public void SetResizeMode(IntPtr hWnd, int value)
        {
            switch (value)
            {
                case IDesktopPlatformService.ResizeMode_NoResize:
                    _ = DeleteMenu(GetSystemMenu(hWnd, false), SC_MAXIMIZE, MF_BYCOMMAND);
                    _ = DeleteMenu(GetSystemMenu(hWnd, false), SC_MINIMIZE, MF_BYCOMMAND);
                    HideMinimizeAndMaximizeButtons(hWnd);
                    break;
                case IDesktopPlatformService.ResizeMode_CanMinimize:
                    _ = DeleteMenu(GetSystemMenu(hWnd, false), SC_MAXIMIZE, MF_BYCOMMAND);
                    DisableMaximizeButton(hWnd);
                    break;
            }
        }

        #endregion
    }
}