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 licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_MSW_ENHMETA_H_
  13 #define _WX_MSW_ENHMETA_H_
  14
  15 #include "wx/dc.h"
  16 #include "wx/gdiobj.h"
  17
  18 #if wxUSE_DRAG_AND_DROP
  19     #include "wx/dataobj.h"
  20 #endif
  21
  22 // ----------------------------------------------------------------------------
  23 // wxEnhMetaFile: encapsulation of Win32 HENHMETAFILE
  24 // ----------------------------------------------------------------------------
  25
  26 class WXDLLEXPORT wxEnhMetaFile : public wxGDIObject
  27 {
  28 public:
  29     wxEnhMetaFile(const wxString& file = wxEmptyString) : m_filename(file)
  30         { Init(); }
  31     wxEnhMetaFile(const wxEnhMetaFile& metafile) : wxGDIObject()
  32         { Init(); Assign(metafile); }
  33     wxEnhMetaFile& operator=(const wxEnhMetaFile& metafile)
  34         { Free(); Assign(metafile); return *this; }
  35
  36     virtual ~wxEnhMetaFile()
  37         { Free(); }
  38
  39     // display the picture stored in the metafile on the given DC
  40     bool Play(wxDC *dc, wxRect *rectBound = (wxRect *)NULL);
  41
  42     // accessors
  43     virtual bool IsOk() const { return m_hMF != 0; }
  44
  45     wxSize GetSize() const;
  46     int GetWidth() const { return GetSize().x; }
  47     int GetHeight() const { return GetSize().y; }
  48
  49     const wxString& GetFileName() const { return m_filename; }
  50
  51     // copy the metafile to the clipboard: the width and height parameters are
  52     // for backwards compatibility (with wxMetaFile) only, they are ignored by
  53     // this method
  54     bool SetClipboard(int width = 0, int height = 0);
  55
  56     // implementation
  57     WXHANDLE GetHENHMETAFILE() const { return m_hMF; }
  58     void SetHENHMETAFILE(WXHANDLE hMF) { Free(); m_hMF = hMF; }
  59
  60 protected:
  61     void Init();
  62     void Free();
  63     void Assign(const wxEnhMetaFile& mf);
  64
  65     // we don't use these functions (but probably should) but have to implement
  66     // them as they're pure virtual in the base class
  67     virtual wxGDIRefData *CreateGDIRefData() const;
  68     virtual wxGDIRefData *CloneGDIRefData(const wxGDIRefData *data) const;
  69
  70 private:
  71     wxString m_filename;
  72     WXHANDLE m_hMF;
  73
  74     DECLARE_DYNAMIC_CLASS(wxEnhMetaFile)
  75 };
  76
  77 // ----------------------------------------------------------------------------
  78 // wxEnhMetaFileDC: allows to create a wxEnhMetaFile
  79 // ----------------------------------------------------------------------------
  80
  81 class WXDLLEXPORT wxEnhMetaFileDC : public wxDC
  82 {
  83 public:
  84     // the ctor parameters specify the filename (empty for memory metafiles),
  85     // the metafile picture size and the optional description/comment
  86     wxEnhMetaFileDC(const wxString& filename = wxEmptyString,
  87                     int width = 0, int height = 0,
  88                     const wxString& description = wxEmptyString);
  89
  90     DECLARE_DYNAMIC_CLASS_NO_COPY(wxEnhMetaFileDC)
  91 };
  92
  93 #if wxUSE_DRAG_AND_DROP
  94
  95 // ----------------------------------------------------------------------------
  96 // wxEnhMetaFileDataObject is a specialization of wxDataObject for enh metafile
  97 // ----------------------------------------------------------------------------
  98
  99 // notice that we want to support both CF_METAFILEPICT and CF_ENHMETAFILE and
 100 // so we derive from wxDataObject and not from wxDataObjectSimple
 101 class WXDLLEXPORT wxEnhMetaFileDataObject : public wxDataObject
 102 {
 103 public:
 104     // ctors
 105     wxEnhMetaFileDataObject() { }
 106     wxEnhMetaFileDataObject(const wxEnhMetaFile& metafile)
 107         : m_metafile(metafile) { }
 108
 109     // virtual functions which you may override if you want to provide data on
 110     // demand only - otherwise, the trivial default versions will be used
 111     virtual void SetMetafile(const wxEnhMetaFile& metafile)
 112         { m_metafile = metafile; }
 113     virtual wxEnhMetaFile GetMetafile() const
 114         { return m_metafile; }
 115
 116     // implement base class pure virtuals
 117     virtual wxDataFormat GetPreferredFormat(Direction dir) const;
 118     virtual size_t GetFormatCount(Direction dir) const;
 119     virtual void GetAllFormats(wxDataFormat *formats, Direction dir) const;
 120     virtual size_t GetDataSize(const wxDataFormat& format) const;
 121     virtual bool GetDataHere(const wxDataFormat& format, void *buf) const;
 122     virtual bool SetData(const wxDataFormat& format, size_t len,
 123                          const void *buf);
 124
 125 protected:
 126     wxEnhMetaFile m_metafile;
 127
 128     DECLARE_NO_COPY_CLASS(wxEnhMetaFileDataObject)
 129 };
 130
 131
 132 // ----------------------------------------------------------------------------
 133 // wxEnhMetaFileSimpleDataObject does derive from wxDataObjectSimple which
 134 // makes it more convenient to use (it can be used with wxDataObjectComposite)
 135 // at the price of not supoprting any more CF_METAFILEPICT but only
 136 // CF_ENHMETAFILE
 137 // ----------------------------------------------------------------------------
 138
 139 class WXDLLEXPORT wxEnhMetaFileSimpleDataObject : public wxDataObjectSimple
 140 {
 141 public:
 142     // ctors
 143     wxEnhMetaFileSimpleDataObject() : wxDataObjectSimple(wxDF_ENHMETAFILE) { }
 144     wxEnhMetaFileSimpleDataObject(const wxEnhMetaFile& metafile)
 145         : wxDataObjectSimple(wxDF_ENHMETAFILE), m_metafile(metafile) { }
 146
 147     // virtual functions which you may override if you want to provide data on
 148     // demand only - otherwise, the trivial default versions will be used
 149     virtual void SetEnhMetafile(const wxEnhMetaFile& metafile)
 150         { m_metafile = metafile; }
 151     virtual wxEnhMetaFile GetEnhMetafile() const
 152         { return m_metafile; }
 153
 154     // implement base class pure virtuals
 155     virtual size_t GetDataSize() const;
 156     virtual bool GetDataHere(void *buf) const;
 157     virtual bool SetData(size_t len, const void *buf);
 158
 159     virtual size_t GetDataSize(const wxDataFormat& WXUNUSED(format)) const
 160         { return GetDataSize(); }
 161     virtual bool GetDataHere(const wxDataFormat& WXUNUSED(format),
 162                              void *buf) const
 163         { return GetDataHere(buf); }
 164     virtual bool SetData(const wxDataFormat& WXUNUSED(format),
 165                          size_t len, const void *buf)
 166         { return SetData(len, buf); }
 167
 168 protected:
 169     wxEnhMetaFile m_metafile;
 170
 171     DECLARE_NO_COPY_CLASS(wxEnhMetaFileSimpleDataObject)
 172 };
 173
 174 #endif // wxUSE_DRAG_AND_DROP
 175
 176 #endif // _WX_MSW_ENHMETA_H_