wxWidgets/include/wx/os2/metafile.h

/////////////////////////////////////////////////////////////////////////////
// Name:        metafile.h
// Purpose:     wxMetaFile, wxMetaFileDC classes.
//              This probably should be restricted to Windows platforms,
//              but if there is an equivalent on your platform, great.
// Author:      David Webster
// Modified by:
// Created:     10/10/99
// RCS-ID:      $Id$
// Copyright:   (c) David Webster
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////


#ifndef _WX_METAFIILE_H_
#define _WX_METAFIILE_H_

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

#if wxUSE_DRAG_AND_DROP
#include "wx/dataobj.h"
#endif

/*
 * Metafile and metafile device context classes
 *
 */

#define wxMetaFile wxMetafile
#define wxMetaFileDC wxMetafileDC

class WXDLLEXPORT wxMetafile;

class WXDLLEXPORT wxMetafileRefData: public wxGDIRefData
{
    friend class WXDLLEXPORT wxMetafile;
public:
    wxMetafileRefData(void);
    ~wxMetafileRefData(void);

public:
    WXHANDLE m_metafile;
    int m_windowsMappingMode;
};

#define M_METAFILEDATA ((wxMetafileRefData *)m_refData)

class WXDLLEXPORT wxMetafile: public wxGDIObject
{
    DECLARE_DYNAMIC_CLASS(wxMetafile)
public:
    // Copy constructor
    inline wxMetafile(const wxMetafile& metafile)
    { Ref(metafile); }

    wxMetafile(const wxString& file = wxEmptyString);
    ~wxMetafile(void);

    // After this is called, the metafile cannot be used for anything
    // since it is now owned by the clipboard.
    virtual bool SetClipboard(int width = 0, int height = 0);

    virtual bool Play(wxDC *dc);
    inline bool Ok(void) const { return (M_METAFILEDATA && (M_METAFILEDATA->m_metafile != 0)); };

    // Implementation
    inline WXHANDLE GetHMETAFILE(void) { return M_METAFILEDATA->m_metafile; }
    void SetHMETAFILE(WXHANDLE mf) ;
    inline int GetWindowsMappingMode(void) { return M_METAFILEDATA->m_windowsMappingMode; }
    void SetWindowsMappingMode(int mm);

    // Operators
    inline wxMetafile& operator = (const wxMetafile& metafile)
        { if (*this == metafile) return (*this); Ref(metafile); return *this; }
    inline bool operator== (const wxMetafile& metafile) const
        { return m_refData == metafile.m_refData; }
    inline bool operator!= (const wxMetafile& metafile) const
        { return m_refData != metafile.m_refData; }
};

class WXDLLEXPORT wxMetafileDC: public wxDC
{
    DECLARE_DYNAMIC_CLASS(wxMetafileDC)

public:
    // Don't supply origin and extent
    // Supply them to wxMakeMetaFilePlaceable instead.
    wxMetafileDC(const wxString& file = wxEmptyString);

    // Supply origin and extent (recommended).
    // Then don't need to supply them to wxMakeMetaFilePlaceable.
    wxMetafileDC(const wxString& file, int xext, int yext, int xorg, int yorg);

    ~wxMetafileDC(void);

    // Should be called at end of drawing
    virtual wxMetafile *Close(void);
    virtual void SetMapMode(int mode);
    virtual void GetTextExtent(const wxString& string, long *x, long *y,
                               long *descent = NULL, long *externalLeading = NULL,
                               wxFont *theFont = NULL, bool use16bit = false) const;

    // Implementation
    inline wxMetafile *GetMetaFile(void) const { return m_metaFile; }
    inline void SetMetaFile(wxMetafile *mf) { m_metaFile = mf; }
    inline int GetWindowsMappingMode(void) const { return m_windowsMappingMode; }
    inline void SetWindowsMappingMode(int mm) { m_windowsMappingMode = mm; }

protected:
    int           m_windowsMappingMode;
    wxMetafile*   m_metaFile;

private:
#ifndef __WATCOMC__
    // function hiding warning supression
    // still required ??
    inline virtual void   GetTextExtent( const wxString& string
                                        ,long*           width
                                        ,long*           height
                                        ,long*           descent = NULL
                                        ,long*           externalLeading = NULL
                                        ,wxFont*         theFont = NULL
                                       ) const
    { GetTextExtent( string, width, height, descent, externalLeading, theFont, false);};
#endif
};

/*
 * Pass filename of existing non-placeable metafile, and bounding box.
 * Adds a placeable metafile header, sets the mapping mode to anisotropic,
 * and sets the window origin and extent to mimic the wxMM_TEXT mapping mode.
 *
 */

// No origin or extent
#define wxMakeMetaFilePlaceable wxMakeMetafilePlaceable
bool WXDLLEXPORT wxMakeMetafilePlaceable(const wxString& filename, float scale = 1.0);

// Optional origin and extent
bool WXDLLEXPORT wxMakeMetaFilePlaceable( const wxString& filename
                                         ,int x1
                                         ,int y1
                                         ,int x2
                                         ,int y2
                                         ,float scale = 1.0
                                         ,bool useOriginAndExtent = true
                                        );

// ----------------------------------------------------------------------------
// wxMetafileDataObject is a specialization of wxDataObject for metafile data
// ----------------------------------------------------------------------------

// TODO: implement OLE side of things. At present, it's just for clipboard
// use.

#if wxUSE_DRAG_AND_DROP
class WXDLLEXPORT wxMetafileDataObject : public wxDataObject
{
public:
    // ctors
    wxMetafileDataObject() { m_width = 0; m_height = 0; };
    wxMetafileDataObject(const wxMetafile& metafile, int width = 0,int height = 0)
                        :m_metafile(metafile)
                        ,m_width(width)
                        ,m_height(height) { }

    void SetMetafile(const wxMetafile& metafile, int w = 0, int h = 0)
        { m_metafile = metafile; m_width = w; m_height = h; }
    wxMetafile GetMetafile() const { return m_metafile; }
    int GetWidth() const { return m_width; }
    int GetHeight() const { return m_height; }

    virtual wxDataFormat GetFormat() const { return wxDF_METAFILE; }

/* ??
    // implement base class pure virtuals
    virtual wxDataFormat GetPreferredFormat() const
        { return (wxDataFormat) wxDataObject::Text; }
    virtual bool IsSupportedFormat(wxDataFormat format) const
        { return format == wxDataObject::Text || format == wxDataObject::Locale; }
    virtual size_t GetDataSize() const
        { return m_strText.Len() + 1; } // +1 for trailing '\0'of course
    virtual void GetDataHere(void *pBuf) const
        { memcpy(pBuf, m_strText.c_str(), GetDataSize()); }
*/

private:
    wxMetafile   m_metafile;
    int          m_width;
    int          m_height;
};
#endif

#endif
    // _WX_METAFIILE_H_