Yeah WinForm can be "embedded" into SDL2 / GLFW3

[DeafMan1983]

Hello everyone,

I know who said SDL2 or GLFW3 don't support MdiContainer. Now I expect that SetParant, SetWindowPos can catch System.Windows.Form()

I show you picture - It is test window of HelloWorld under DotNet 6.x

And I show you proof as video. You would like know me. I trust everyone.

Form.IsMDIContainer = OK
MessageBox -> I haven't tested ..

PS: I don't care Imgui because it looks weird for me.
I never say bad but I respect everyone.

I would like to show code:

If you expect how did I embed Form inside SDL2 or GLFW3 ( But I haven't tested with GLFW3 ) then you can develop Game with system-engineed GUI like Half-Life's GUI or Unreal T.... 2003 - I saw and played it. Unreal T.... 2003 has embedded WinAPI-GUI inside SDl1/2.

using Silk.NET.SDL;
using Silk.NET.OpenGL;

using System.Runtime.InteropServices;

namespace Example;

unsafe class DotnetApp
{
    [DllImport("user32.dll")]
	private static extern IntPtr SetWindowPos(
		IntPtr handle,
		IntPtr handleAfter,
		int x,
		int y,
		int cx,
		int cy,
		uint flags
	);
	[DllImport("user32.dll")]
	private static extern IntPtr SetParent(IntPtr child, IntPtr newParent);
	[DllImport("user32.dll")]
	private static extern IntPtr ShowWindow(IntPtr handle, int command);

    private Sdl sdl;
    private GL gl;
    public DotnetApp()
    {   
        sdl = Sdl.GetApi();

        nint proc_address(string name)
        {
            return (nint)sdl.GLGetProcAddress(name);
        }
        gl = GL.GetApi(proc_address);
    }

    public void Run()
    {
        if (sdl.Init(Sdl.InitEverything) != 0)
        {
            Console.WriteLine("Error: SDL2 initializes failed.", sdl.GetErrorS());
        }

        Window* window = sdl.CreateWindow("01 Hello World", Sdl.WindowposCentered, Sdl.WindowposCentered, 800, 600, (uint)WindowFlags.WindowOpengl);
        if (window == null)
        {
            Console.WriteLine("Error: Window opens failed.", sdl.GetErrorS());
        }

        void* context = sdl.GLCreateContext(window);
        if (context == null)
        {
            Console.WriteLine("Error: GL_Context creates failed.", sdl.GetErrorS());
        }

        // Woohoo WinForm embeds in SDL2 Juppiii but It looks weird because f**king DirectX and OpenGL have conflict 
        SysWMInfo wm_info = new SysWMInfo();
        sdl.GetWindowWMInfo(window, &wm_info);
        nint winhandle = wm_info.Info.Win.Hwnd;
        Form Form = new Form
        {
            BackColor = System.Drawing.Color.DimGray,
            Text = "WinForm under SDL2",
            FormBorderStyle = FormBorderStyle.FixedDialog
        };
        Form.IsMdiContainer = true;
        SetParent(Form.Handle, winhandle);
        SetWindowPos(Form.Handle, winhandle, 100, 100, 200, 200, 0x0401);
        ShowWindow(Form.Handle, 1);

        bool running = true;
        Event evt = new Event();
        while (running)
        {
            while (sdl.PollEvent(&evt) != 0)
            {
                if (evt.Type == (uint)EventType.Quit)
                {
                    running = false;
                }

                if (evt.Type == (uint)EventType.Keydown)
                {
                    if (evt.Key.Keysym.Sym == (int)KeyCode.KEscape)
                        running = false;
                }
            }

            // Do not forget to loop with Winforms
            while (!Form.Created)
            {

            }

            gl.ClearColor(1.0f, 0.25f, 0f, 1.0f);
            gl.Clear(ClearBufferMask.ColorBufferBit);

            sdl.GLSwapWindow(window);
        }

        sdl.GLDeleteContext(context);
        sdl.DestroyWindow(window);

        sdl.Quit();
    }

    static int Main(string[] args)
    {
        DotnetApp app = new DotnetApp();
        app.Run();
        return 0;
    }
}

Positive:

Works fine....

Negative:

If you move Window-Border then it looks like weird 👎
Close from Window-CloseButton = crashed SDL2

Regards and stay healtly!

[DeafMan1983]

Small update

I have replaced Form with Panel because moving window looks better like real.

        SysWMInfo wm_info = new SysWMInfo();
        sdl.GetWindowWMInfo(window, &wm_info);
        nint winhandle = wm_info.Info.Win.Hwnd;

        // Woohooo that is realistic GUI inside SDL2 like Half-Life Gui :D :D
        System.Drawing.Point p = new System.Drawing.Point();
        int draggable = 0;
        Panel Form = new Panel
        {
            BackColor = System.Drawing.Color.DimGray,
            Text = "WinForm under SDL2",
        };
        Form.MouseDown += (o, s) =>
        {
            p.X = s.X;
            p.Y = s.Y;
            draggable = 1;
        };

        Form.MouseMove += (o, s) => 
        {
            if (draggable == 1)
            {
                Form.Location = new System.Drawing.Point(s.X - p.X + Form.Location.X, s.Y - p.Y + Form.Location.Y);
            }
        };

        Form.MouseUp += (o, s) =>
        {
            draggable = 0;
        };
        //Form.IsMdiContainer = true;
        SetParent(Form.Handle, winhandle);
        SetWindowPos(Form.Handle, winhandle, 0, 0, 0, 0, 0x0401);
        ShowWindow(Form.Handle, 1);
        Button btn = new Button
        {
            Text = "Click me!",
            Location = new System.Drawing.Point(10, 10)
        };
        btn.Click += (o, s) =>
        {
            Panel childpanel = new Panel();
            childpanel.Location = new System.Drawing.Point((800 - childpanel.Width) / 2, (600 - childpanel.Height) / 2);
            childpanel.Size = new Size(200, 100);
            SetParent(childpanel.Handle, winhandle);
            ShowWindow(childpanel.Handle, 1);

            Label lbl = new Label();
            lbl.Text = "Child Window";
            lbl.Location = new System.Drawing.Point(5, 5);
            childpanel.Controls.Add(lbl);

            Button hideBtn = new Button();
            hideBtn.Text = "Hide";
            hideBtn.Location = new System.Drawing.Point((childpanel.Width - hideBtn.Width - 5), (childpanel.Height - hideBtn.Height - 5));
            childpanel.Controls.Add(hideBtn);
            hideBtn.Click += (hpo, hps) =>
            {
                ShowWindow(childpanel.Handle, 0);
            };
        };
        Form.Controls.Add(btn);

And screenshot looks like real system-engineed GUI

Enjoy your game development with system-engineed GUI!