c# - Recognize touch as MouseDown event

Question

I am building a puzzle game in C#, winforms for a touch screen.

I am able to handle touch events on mouse handlers, in fact, i did nothing at all, but it already recognizes my touches. However, there is an issue that i can't figure it out. The mouse_down, only happens when i move a bit my finger, and did not recognize the instant when i touch the screen.

Does anyone has already faced this problem? Should i implement some touch events recognition? If so, could you please point me some documentation or examples?

Many Thanks in advance

Answer 1

Thanks @PiotrWolkowski

You were correct about the way i should follow... Some other issues appear, but i solved the initial problem overriding the WndProc as showed in the following:

protected override void WndProc(ref Message m)
    {
        switch (m.Msg)
        {
            case Win32.WM_POINTERDOWN:
            case Win32.WM_POINTERUP:
            case Win32.WM_POINTERUPDATE:
            case Win32.WM_POINTERCAPTURECHANGED:
                break;

            default:
                base.WndProc(ref m);
                return;
        }
        int pointerID = Win32.GET_POINTER_ID(m.WParam);
        Win32.POINTER_INFO pi = new Win32.POINTER_INFO();
        if (!Win32.GetPointerInfo(pointerID, ref pi))
        {
            Win32.CheckLastError();
        }
        Point pt = PointToClient(pi.PtPixelLocation.ToPoint());
        MouseEventArgs me = new MouseEventArgs(System.Windows.Forms.MouseButtons.Left, 1, pt.X, pt.Y, 0);
        switch (m.Msg)
        {
            case Win32.WM_POINTERDOWN:
                    Console.WriteLine("TOCOU" + pt);
                    (Parent as Jogo).Form1_MouseDown((this as object), me);
                break;

            case Win32.WM_POINTERUP:
                    Console.WriteLine("LEVANTOU");
                    (Parent as Jogo).Form1_MouseUp((this as object), me);
                break;

            case Win32.WM_POINTERUPDATE:
                    //Console.WriteLine("UPDATE");
                    (Parent as Jogo).Form1_MouseMove((this as object), me);
                break;
        }
    }

It was supported by an "Win32.cs" that can be downloaded here:

https://gist.github.com/RSchwoerer/bc5c04899c0510aefca24f088a79cebf

Hope this is helpful for you;)