Question

How do I make only the bottom of my vc++ windows form sizable and the rest of the sides (left, right, and top) not sizable?

I want the default arrow cursor to be displayed when moving around the 3 sides of my form (top side, left side, and right side) and the size NS arrow to be displayed and functional on the bottom of my form.

Thanks.

Answer 1

This requires falling back to handling the Windows notification directly, it isn’t wrapped by the Form class. You’ll need to override the WndProc() method and customize the handling of WM_NCHITTEST. Modify your stdafx.h file and add #include <windows.h> then add this code to your form:

protected:
    virtual void WndProc(Message% m) override {
        __super::WndProc(m);
        if (m.Msg == WM_NCHITTEST) {
            switch ((int)m.Result) {
                case HTLEFT: case HTRIGHT: case HTTOP: 
                case HTTOPLEFT: case HTTOPRIGHT:
                case HTBOTTOMLEFT: case HTBOTTOMRIGHT:
                    m.Result = (IntPtr)HTCLIENT;
            }
        }
    }