include/wx/palmos/enhmeta.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/palmos/enhmeta.h
   3 // Purpose:     wxEnhMetaFile class for PalmOS
   4 // Author:      William Osborne - minimal working wxPalmOS port
   5 // Modified by:
   6 // Created:     10/13/04
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) William Osborne
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_PALMOS_ENHMETA_H_
  13 #define _WX_PALMOS_ENHMETA_H_
  14
  15 #include "wx/dc.h"
  16
  17 #if wxUSE_DRAG_AND_DROP
  18     #include "wx/dataobj.h"
  19 #endif
  20
  21 // ----------------------------------------------------------------------------
  22 // wxEnhMetaFile: encapsulation of Win32 HENHMETAFILE
  23 // ----------------------------------------------------------------------------
  24
  25 class WXDLLEXPORT wxEnhMetaFile : public wxObject
  26 {
  27 public:
  28     wxEnhMetaFile(const wxString& file = wxEmptyString) : m_filename(file)
  29         { Init(); }
  30     wxEnhMetaFile(const wxEnhMetaFile& metafile)
  31         { Init(); Assign(metafile); }
  32     wxEnhMetaFile& operator=(const wxEnhMetaFile& metafile)
  33         { Free(); Assign(metafile); return *this; }
  34
  35     virtual ~wxEnhMetaFile()
  36         { Free(); }
  37
  38     // display the picture stored in the metafile on the given DC
  39     bool Play(wxDC *dc, wxRect *rectBound = (wxRect *)NULL);
  40
  41     // accessors
  42     bool Ok() const { return IsOk(); }
  43     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() { m_hMF = 0; }
  62     void Free();
  63     void Assign(const wxEnhMetaFile& mf);
  64
  65 private:
  66     wxString m_filename;
  67     WXHANDLE m_hMF;
  68
  69     DECLARE_DYNAMIC_CLASS(wxEnhMetaFile)
  70 };
  71
  72 // ----------------------------------------------------------------------------
  73 // wxEnhMetaFileDC: allows to create a wxEnhMetaFile
  74 // ----------------------------------------------------------------------------
  75
  76 class WXDLLEXPORT wxEnhMetaFileDC : public wxDC
  77 {
  78 public:
  79     // the ctor parameters specify the filename (empty for memory metafiles),
  80     // the metafile picture size and the optional description/comment
  81     wxEnhMetaFileDC(const wxString& filename = wxEmptyString,
  82                     int width = 0, int height = 0,
  83                     const wxString& description = wxEmptyString);
  84
  85     virtual ~wxEnhMetaFileDC();
  86
  87     // obtain a pointer to the new metafile (caller should delete it)
  88     wxEnhMetaFile *Close();
  89
  90 private:
  91     DECLARE_DYNAMIC_CLASS_NO_COPY(wxEnhMetaFileDC)
  92 };
  93
  94 #if wxUSE_DRAG_AND_DROP
  95
  96 // ----------------------------------------------------------------------------
  97 // wxEnhMetaFileDataObject is a specialization of wxDataObject for enh metafile
  98 // ----------------------------------------------------------------------------
  99
 100 // notice that we want to support both CF_METAFILEPICT and CF_ENHMETAFILE and
 101 // so we derive from wxDataObject and not from wxDataObjectSimple
 102 class WXDLLEXPORT wxEnhMetaFileDataObject : public wxDataObject
 103 {
 104 public:
 105     // ctors
 106     wxEnhMetaFileDataObject() { }
 107     wxEnhMetaFileDataObject(const wxEnhMetaFile& metafile)
 108         : m_metafile(metafile) { }
 109
 110     // virtual functions which you may override if you want to provide data on
 111     // demand only - otherwise, the trivial default versions will be used
 112     virtual void SetMetafile(const wxEnhMetaFile& metafile)
 113         { m_metafile = metafile; }
 114     virtual wxEnhMetaFile GetMetafile() const
 115         { return m_metafile; }
 116
 117     // implement base class pure virtuals
 118     virtual wxDataFormat GetPreferredFormat(Direction dir) const;
 119     virtual size_t GetFormatCount(Direction dir) const;
 120     virtual void GetAllFormats(wxDataFormat *formats, Direction dir) const;
 121     virtual size_t GetDataSize(const wxDataFormat& format) const;
 122     virtual bool GetDataHere(const wxDataFormat& format, void *buf) const;
 123     virtual bool SetData(const wxDataFormat& format, size_t len,
 124                          const void *buf);
 125
 126 protected:
 127     wxEnhMetaFile m_metafile;
 128
 129     DECLARE_NO_COPY_CLASS(wxEnhMetaFileDataObject)
 130 };
 131
 132
 133 // ----------------------------------------------------------------------------
 134 // wxEnhMetaFileSimpleDataObject does derive from wxDataObjectSimple which
 135 // makes it more convenient to use (it can be used with wxDataObjectComposite)
 136 // at the price of not supoprting any more CF_METAFILEPICT but only
 137 // CF_ENHMETAFILE
 138 // ----------------------------------------------------------------------------
 139
 140 class WXDLLEXPORT wxEnhMetaFileSimpleDataObject : public wxDataObjectSimple
 141 {
 142 public:
 143     // ctors
 144     wxEnhMetaFileSimpleDataObject() : wxDataObjectSimple(wxDF_ENHMETAFILE) { }
 145     wxEnhMetaFileSimpleDataObject(const wxEnhMetaFile& metafile)
 146         : wxDataObjectSimple(wxDF_ENHMETAFILE), m_metafile(metafile) { }
 147
 148     // virtual functions which you may override if you want to provide data on
 149     // demand only - otherwise, the trivial default versions will be used
 150     virtual void SetEnhMetafile(const wxEnhMetaFile& metafile)
 151         { m_metafile = metafile; }
 152     virtual wxEnhMetaFile GetEnhMetafile() const
 153         { return m_metafile; }
 154
 155     // implement base class pure virtuals
 156     virtual size_t GetDataSize() const;
 157     virtual bool GetDataHere(void *buf) const;
 158     virtual bool SetData(size_t len, const void *buf);
 159
 160     virtual size_t GetDataSize(const wxDataFormat& WXUNUSED(format)) const
 161         { return GetDataSize(); }
 162     virtual bool GetDataHere(const wxDataFormat& WXUNUSED(format),
 163                              void *buf) const
 164         { return GetDataHere(buf); }
 165     virtual bool SetData(const wxDataFormat& WXUNUSED(format),
 166                          size_t len, const void *buf)
 167         { return SetData(len, buf); }
 168
 169 protected:
 170     wxEnhMetaFile m_metafile;
 171
 172     DECLARE_NO_COPY_CLASS(wxEnhMetaFileSimpleDataObject)
 173 };
 174
 175 #endif // wxUSE_DRAG_AND_DROP
 176
 177 #endif // _WX_PALMOS_ENHMETA_H_