painter_base.hpp

// painter_base.hpp

// Copyright (C) 2004 Steven Weiß (steven11@gmx.de)
//
// Permission to copy, use, sell and distribute this software is granted
// provided this copyright notice appears in all copies.
// Permission to modify the code and to distribute modified code is granted
// provided this copyright notice appears in all copies, and a notice
// that the code was modified is included with the copyright notice.
//
// This software is provided "as is" without express or implied warranty,
// and with no claim as to its suitability for any purpose.


#pragma once
#include <background_wnd/detail/include.hpp>


namespace win32 { namespace gui {

struct painter_base
{
     painter_base()
     {}

    virtual ~painter_base()
    {}
    
     virtual bool is_opaque(int cx, int cy) const
     {
          return false;
     }

    virtual void draw(HDC hDC, int cx, int cy) = 0;    
     
     // FIX_5
     // Allow copy construction only through clone() (necessary for painter_holder and background_wnd)
     virtual painter_base* clone() const = 0;

protected:
     // FIX_5
     painter_base(const painter_base&) {}
     const painter_base& operator= (const painter_base&) 
     {
          return *this;
     }
};

// ========================================================================================================= //

struct null_painter : painter_base
{    
     null_painter* clone() const { return new null_painter(); }
     void draw(HDC hDC, int cx, int cy) {}
};

} }  // namespace win32::gui