wxWidgets/include/wx/colour.h

/////////////////////////////////////////////////////////////////////////////
// Name:        wx/colour.h
// Purpose:     wxColourBase definition
// Author:      Julian Smart
// Modified by: Francesco Montorsi
// Created:
// RCS-ID:      $Id$
// Copyright:   Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_COLOUR_H_BASE_
#define _WX_COLOUR_H_BASE_

#include "wx/defs.h"
#include "wx/gdiobj.h"


class WXDLLIMPEXP_FWD_CORE wxColour;

// A macro to define the standard wxColour constructors:
//
// It avoids the need to repeat these lines across all colour.h files, since
// Set() is a virtual function and thus cannot be called by wxColourBase ctors
#define DEFINE_STD_WXCOLOUR_CONSTRUCTORS                                      \
    wxColour() { Init(); }                                                    \
    wxColour(ChannelType red,                                                 \
             ChannelType green,                                               \
             ChannelType blue,                                                \
             ChannelType alpha = wxALPHA_OPAQUE)                              \
        { Init(); Set(red, green, blue, alpha); }                             \
    wxColour(unsigned long colRGB) { Init(); Set(colRGB    ); }               \
    wxColour(const wxString& colourName) { Init(); Set(colourName); }         \
    wxColour(const char *colourName) { Init(); Set(colourName); }             \
    wxColour(const wchar_t *colourName) { Init(); Set(colourName); }


// flags for wxColour -> wxString conversion (see wxColour::GetAsString)
#define wxC2S_NAME              1   // return colour name, when possible
#define wxC2S_CSS_SYNTAX        2   // return colour in rgb(r,g,b) syntax
#define wxC2S_HTML_SYNTAX       4   // return colour in #rrggbb syntax


const unsigned char wxALPHA_TRANSPARENT = 0;
const unsigned char wxALPHA_OPAQUE = 0xff;

// ----------------------------------------------------------------------------
// wxVariant support
// ----------------------------------------------------------------------------

#if wxUSE_VARIANT
#include "wx/variant.h"
DECLARE_VARIANT_OBJECT_EXPORTED(wxColour,WXDLLEXPORT)
#endif

//-----------------------------------------------------------------------------
// wxColourBase: this class has no data members, just some functions to avoid
//               code redundancy in all native wxColour implementations
//-----------------------------------------------------------------------------

#if defined( __WXMAC__ ) || defined( __WXMSW__ ) || defined( __WXPM__ )
#define wxCOLOUR_IS_GDIOBJECT 0
#else
#define wxCOLOUR_IS_GDIOBJECT 1
#endif

class WXDLLEXPORT wxColourBase : public 
#if wxCOLOUR_IS_GDIOBJECT
    wxGDIObject
#else
    wxObject
#endif
{
public:
    // type of a single colour component
    typedef unsigned char ChannelType;

    wxColourBase() {}
    virtual ~wxColourBase() {}


    // Set() functions
    // ---------------

    void Set(ChannelType red,
             ChannelType green,
             ChannelType blue,
             ChannelType alpha = wxALPHA_OPAQUE)
        { InitRGBA(red,green,blue, alpha); }

    // implemented in colourcmn.cpp
    bool Set(const wxString &str)
        { return FromString(str); }

    void Set(unsigned long colRGB)
    {
        // we don't need to know sizeof(long) here because we assume that the three
        // least significant bytes contain the R, G and B values
        Set((ChannelType)(0xFF & colRGB),
            (ChannelType)(0xFF & (colRGB >> 8)),
            (ChannelType)(0xFF & (colRGB >> 16)));
    }



    // accessors
    // ---------

    virtual ChannelType Red() const = 0;
    virtual ChannelType Green() const = 0;
    virtual ChannelType Blue() const = 0;
    virtual ChannelType Alpha() const
        { return wxALPHA_OPAQUE ; }

    // implemented in colourcmn.cpp
    virtual wxString GetAsString(long flags = wxC2S_NAME | wxC2S_CSS_SYNTAX) const;

#if !wxCOLOUR_IS_GDIOBJECT
    virtual bool IsOk() const= 0;
    
    // older version, for backwards compatibility only (but not deprecated
    // because it's still widely used)
    bool Ok() const { return IsOk(); }
#endif

    // old, deprecated
    // ---------------

#if WXWIN_COMPATIBILITY_2_6
    wxDEPRECATED( static wxColour CreateByName(const wxString& name) );
    wxDEPRECATED( void InitFromName(const wxString& col) );
#endif

protected:
    // Some ports need Init() and while we don't, provide a stub so that the
    // ports which don't need it are not forced to define it
    void Init() { }

    virtual void
    InitRGBA(ChannelType r, ChannelType g, ChannelType b, ChannelType a) = 0;

    virtual bool FromString(const wxString& s);

#if wxCOLOUR_IS_GDIOBJECT
    // wxColour doesn't use reference counted data (at least not in all ports)
    // so provide stubs for the functions which need to be defined if we do use
    // them
    virtual wxGDIRefData *CreateGDIRefData() const
    {
        wxFAIL_MSG( "must be overridden if used" );

        return NULL;
    }

    virtual wxGDIRefData *CloneGDIRefData(const wxGDIRefData *WXUNUSED(data)) const
    {
        wxFAIL_MSG( "must be overridden if used" );

        return NULL;
    }
#endif
};


// wxColour <-> wxString utilities, used by wxConfig, defined in colourcmn.cpp
WXDLLIMPEXP_CORE wxString wxToString(const wxColourBase& col);
WXDLLIMPEXP_CORE bool wxFromString(const wxString& str, wxColourBase* col);



#if defined(__WXPALMOS__)
    #include "wx/generic/colour.h"
#elif defined(__WXMSW__)
    #include "wx/msw/colour.h"
#elif defined(__WXMOTIF__)
    #include "wx/motif/colour.h"
#elif defined(__WXGTK20__)
    #include "wx/gtk/colour.h"
#elif defined(__WXGTK__)
    #include "wx/gtk1/colour.h"
#elif defined(__WXMGL__)
    #include "wx/generic/colour.h"
#elif defined(__WXDFB__)
    #include "wx/generic/colour.h"
#elif defined(__WXX11__)
    #include "wx/x11/colour.h"
#elif defined(__WXMAC__)
    #include "wx/mac/colour.h"
#elif defined(__WXCOCOA__)
    #include "wx/cocoa/colour.h"
#elif defined(__WXPM__)
    #include "wx/os2/colour.h"
#endif

#define wxColor wxColour

#endif // _WX_COLOUR_H_BASE_