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Author Topic: GTK# with SFML  (Read 3924 times)

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Aravol

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GTK# with SFML
« on: March 03, 2016, 03:51:23 am »
After some trial and error I have suceeded in embedding SFML within a GTK Widget, and thought I would share.

public sealed class GraphicalWidget : DrawingArea
    {
        // The following is for windows systems. For linux systems, replace with the following line; for multiplatform setups, wrap these lines in #if blocks
        // [DllImport("gdk-x11-2.0", Entry Point = "IntPtr gdk_x11_drawable_get_xid", CallingConvention = CallingConvention.Cdecl)]
        [DllImport("libgdk-win32-2.0-0.dll", EntryPoint = "gdk_win32_drawable_get_handle", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr GetGraphicsHandle(IntPtr window);

        public RenderWindow RenderWindow { get; private set; }
       
        public GraphicalWidget()
            : base()
        {
            // Avoid double buffering - SFML already does this for us, and leaving it one will result in "flickering" in the widget
            DoubleBuffered = false;
        }

        protected override void OnRealized()
        {
            base.OnRealized();

            // Wait until OnRealized to create the RenderWindow, since the GdkWindow is null until such
            RenderWindow = new RenderWindow(GetGraphicsHandle());
        }

        protected override bool OnExposeEvent(EventExpose evnt)
        {
            var ok = base.OnExposeEvent(evnt);

            // Check the current szie of the SFML Render
            var sfmlSize = new SFML.System.Vector2u(
                (uint)evnt.Area.Width,
                (uint)evnt.Area.Height);

            if (RenderWindow.Size != sfmlSize)
                RenderWindow.Size = sfmlSize;

            RenderWindow.Clear(SFML.Graphics.Color.Green);
            // TODO: SFML Draw calls go here
            RenderWindow.Display();

            // Ensure the GTK system is aware that we need to be redrawn
            QueueDraw();

            return ok;
        }

        private IntPtr GetGraphicsHandle() => GetGraphicsHandle(GdkWindow.Handle);
 

As a warning, I have not tested this on Linux - the calling convention may need to be adjusted