Tech Tips

Listing 2 Abridged version of window_redraw_scope

/* /////////////////////////////////////////////////////////////
 *
 * ...
 *
 * Extract from winstl_window_redraw_scope.h
 *
 * www:        http://www.synesis.com.au/winstl
 *             http://www.winstl.org/
 *
 * Copyright (C) 2002, Synesis Software Pty Ltd.
 * (Licensed under the Synesis Software Standard Source License:
 *  http://www.synesis.com.au/licenses/ssssl.html)
 *
 * ...
 *
 * ////////////////////////////////////////////////////////// */

...


namespace winstl
{

    class window_redraw_scope
    {
    // Construction
    public:
        // Takes a HWND and changes it's current redraw-status,
        // which is set back to the original state in the 
        // destructor.
        ws_explicit_k window_redraw_scope(HWND hwnd, 
                        ws_bool_t bInvalidateOnUnlock = true)
            : m_hwnd(hwnd)
            , m_bInvalidateOnUnlock(bInvalidateOnUnlock)
        {
            ::SendMessage(m_hwnd, WM_SETREDRAW, false, 0L);
        }

        ~window_redraw_scope() winstl_throw_0()
        {
            ::SendMessage(m_hwnd, WM_SETREDRAW, true, 0L);

            if(m_bInvalidateOnUnlock)
            {
                ::InvalidateRect(m_hwnd, NULL, true);
            }
        }

    // Members
    protected:
        HWND        m_hwnd;
        ws_bool_t   m_bInvalidateOnUnlock;

    // Not to be implemented
    private:
        window_redraw_scope(window_redraw_scope const &rhs);
        window_redraw_scope const 
            &operator =(window_redraw_scope const &rhs);
    };

} // namespace winstl