wxWidgets/include/wx/mac/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:      Stefan Csomor
// Modified by:
// Created:     1998-01-01
// RCS-ID:      $Id$
// Copyright:   (c) Stefan Csomor
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////


#ifndef _WX_METAFIILE_H_
#define _WX_METAFIILE_H_

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

#if wxUSE_DATAOBJ
#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:
    WXHMETAFILE m_metafile;
};

#define M_METAFILEDATA ((wxMetafileRefData *)m_refData)

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

  wxMetafile(const wxString& file = "");
  ~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 WXHMETAFILE GetHMETAFILE(void) { return M_METAFILEDATA->m_metafile; }
  void SetHMETAFILE(WXHMETAFILE mf) ;

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

protected:
};

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 = "");

  // 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);

  // Implementation
  inline wxMetafile *GetMetaFile(void) const { return m_metaFile; }
  inline void SetMetaFile(wxMetafile *mf) { m_metaFile = mf; }

protected:
  wxMetafile*   m_metaFile;
};

/*
 * 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
// ----------------------------------------------------------------------------

#if wxUSE_DATAOBJ
class WXDLLEXPORT wxMetafileDataObject : public wxDataObjectSimple
{
public:
  // ctors
  wxMetafileDataObject() 
    : wxDataObjectSimple(wxDF_METAFILE) {  };
  wxMetafileDataObject(const wxMetafile& metafile)
    : wxDataObjectSimple(wxDF_METAFILE), m_metafile(metafile) { }

    // virtual functions which you may override if you want to provide data on
    // demand only - otherwise, the trivial default versions will be used
    virtual void SetMetafile(const wxMetafile& metafile)
        { m_metafile = metafile; }
    virtual wxMetafile GetMetafile() const
        { return m_metafile; }

    // implement base class pure virtuals
    virtual size_t GetDataSize() const;
    virtual bool GetDataHere(void *buf) const;
    virtual bool SetData(size_t len, const void *buf);

protected:
  wxMetafile   m_metafile;
};
#endif

#endif // wxUSE_METAFILE


#endif
    // _WX_METAFIILE_H_