include/wx/msw/enhmeta.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/msw/enhmeta.h
   3 // Purpose:     wxEnhMetaFile class for Win32
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     13.01.00
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2000 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_MSW_ENHMETA_H_
  13 #define _WX_MSW_ENHMETA_H_
  14
  15 #ifdef __GNUG__
  16     #pragma interface "enhmeta.h"
  17 #endif
  18
  19 #include "wx/dc.h"
  20
  21 #if wxUSE_DRAG_AND_DROP
  22     #include "wx/dataobj.h"
  23 #endif
  24
  25 // ----------------------------------------------------------------------------
  26 // wxEnhMetaFile: encapsulation of Win32 HENHMETAFILE
  27 // ----------------------------------------------------------------------------
  28
  29 class WXDLLEXPORT wxEnhMetaFile : public wxObject
  30 {
  31 public:
  32     wxEnhMetaFile(const wxString& file = wxEmptyString) : m_filename(file)
  33         { Init(); }
  34     wxEnhMetaFile(const wxEnhMetaFile& metafile)
  35         { Init(); Assign(metafile); }
  36     wxEnhMetaFile& operator=(const wxEnhMetaFile& metafile)
  37         { Free(); Assign(metafile); return *this; }
  38
  39     virtual ~wxEnhMetaFile()
  40         { Free(); }
  41
  42     // display the picture stored in the metafile on the given DC
  43     bool Play(wxDC *dc, wxRect *rectBound = (wxRect *)NULL);
  44
  45     // accessors
  46     bool Ok() const { return m_hMF != 0; }
  47
  48     wxSize GetSize() const;
  49     int GetWidth() const { return GetSize().x; }
  50     int GetHeight() const { return GetSize().y; }
  51
  52     const wxString& GetFileName() const { return m_filename; }
  53
  54     // implementation
  55     WXHANDLE GetHENHMETAFILE() const { return m_hMF; }
  56     void SetHENHMETAFILE(WXHANDLE hMF) { Free(); m_hMF = hMF; }
  57
  58 protected:
  59     void Init() { m_hMF = 0; }
  60     void Free();
  61     void Assign(const wxEnhMetaFile& mf);
  62
  63 private:
  64     wxString m_filename;
  65     WXHANDLE m_hMF;
  66
  67     DECLARE_DYNAMIC_CLASS(wxEnhMetaFile)
  68 };
  69
  70 // ----------------------------------------------------------------------------
  71 // wxEnhMetaFileDC: allows to create a wxEnhMetaFile
  72 // ----------------------------------------------------------------------------
  73
  74 class WXDLLEXPORT wxEnhMetaFileDC : public wxDC
  75 {
  76 public:
  77     // the ctor parameters specify the filename (empty for memory metafiles),
  78     // the metafile picture size and the optional description/comment
  79     wxEnhMetaFileDC(const wxString& filename = wxEmptyString,
  80                     int width = 0, int height = 0,
  81                     const wxString& description = wxEmptyString);
  82
  83     virtual ~wxEnhMetaFileDC();
  84
  85     // obtain a pointer to the new metafile (caller should delete it)
  86     wxEnhMetaFile *Close();
  87
  88 private:
  89     DECLARE_DYNAMIC_CLASS(wxEnhMetaFileDC)
  90 };
  91
  92 // ----------------------------------------------------------------------------
  93 // wxEnhMetaFileDataObject is a specialization of wxDataObject for enh metafile
  94 // ----------------------------------------------------------------------------
  95
  96 #if wxUSE_DRAG_AND_DROP
  97
  98 // notice that we want to support both CF_METAFILEPICT and CF_ENHMETAFILE and
  99 // so we derive from and not from wxDataObjectSimple
 100 class WXDLLEXPORT wxEnhMetaFileDataObject : public wxDataObject
 101 {
 102 public:
 103     // ctors
 104     wxEnhMetaFileDataObject() { }
 105     wxEnhMetaFileDataObject(const wxEnhMetaFile& metafile)
 106         : m_metafile(metafile) { }
 107
 108     // virtual functions which you may override if you want to provide data on
 109     // demand only - otherwise, the trivial default versions will be used
 110     virtual void SetMetafile(const wxEnhMetaFile& metafile)
 111         { m_metafile = metafile; }
 112     virtual wxEnhMetaFile GetMetafile() const
 113         { return m_metafile; }
 114
 115     // implement base class pure virtuals
 116     virtual wxDataFormat GetPreferredFormat(Direction dir) const;
 117     virtual size_t GetFormatCount(Direction dir) const;
 118     virtual void GetAllFormats(wxDataFormat *formats, Direction dir) const;
 119     virtual size_t GetDataSize(const wxDataFormat& format) const;
 120     virtual bool GetDataHere(const wxDataFormat& format, void *buf) const;
 121     virtual bool SetData(const wxDataFormat& format, size_t len,
 122                          const void *buf);
 123
 124 protected:
 125     wxEnhMetaFile m_metafile;
 126 };
 127
 128 #endif // wxUSE_DRAG_AND_DROP
 129
 130 #endif // _WX_MSW_ENHMETA_H_