src/msw/fontenum.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/fontenum.cpp
   3 // Purpose:     wxFontEnumerator class for Windows
   4 // Author:      Julian Smart
   5 // Modified by: Vadim Zeitlin to add support for font encodings
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24   #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_FONTMAP
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/gdicmn.h"
  31     #include "wx/font.h"
  32     #include "wx/encinfo.h"
  33 #endif
  34
  35 #include "wx/msw/private.h"
  36
  37 #include "wx/fontutil.h"
  38 #include "wx/fontenum.h"
  39 #include "wx/fontmap.h"
  40
  41 // ----------------------------------------------------------------------------
  42 // private classes
  43 // ----------------------------------------------------------------------------
  44
  45 // the helper class which calls ::EnumFontFamilies() and whose OnFont() is
  46 // called from the callback passed to this function and, in its turn, calls the
  47 // appropariate wxFontEnumerator method
  48 class wxFontEnumeratorHelper
  49 {
  50 public:
  51     wxFontEnumeratorHelper(wxFontEnumerator *fontEnum);
  52
  53     // control what exactly are we enumerating
  54         // we enumerate fonts with given enocding
  55     bool SetEncoding(wxFontEncoding encoding);
  56         // we enumerate fixed-width fonts
  57     void SetFixedOnly(bool fixedOnly) { m_fixedOnly = fixedOnly; }
  58         // we enumerate the encodings available in this family
  59     void SetFamily(const wxString& family);
  60
  61     // call to start enumeration
  62     void DoEnumerate();
  63
  64     // called by our font enumeration proc
  65     bool OnFont(const LPLOGFONT lf, const LPTEXTMETRIC tm) const;
  66
  67 private:
  68     // the object we forward calls to OnFont() to
  69     wxFontEnumerator *m_fontEnum;
  70
  71     // if != -1, enum only fonts which have this encoding
  72     int m_charset;
  73
  74     // if not empty, enum only the fonts with this facename
  75     wxString m_facename;
  76
  77     // if not empty, enum only the fonts in this family
  78     wxString m_family;
  79
  80     // if true, enum only fixed fonts
  81     bool m_fixedOnly;
  82
  83     // if true, we enumerate the encodings, not fonts
  84     bool m_enumEncodings;
  85
  86     // the list of charsets we already found while enumerating charsets
  87     wxArrayInt m_charsets;
  88
  89     // the list of facenames we already found while enumerating facenames
  90     wxArrayString m_facenames;
  91
  92     DECLARE_NO_COPY_CLASS(wxFontEnumeratorHelper)
  93 };
  94
  95 // ----------------------------------------------------------------------------
  96 // private functions
  97 // ----------------------------------------------------------------------------
  98
  99 #ifndef __WXMICROWIN__
 100 int CALLBACK wxFontEnumeratorProc(LPLOGFONT lplf, LPTEXTMETRIC lptm,
 101                                   DWORD dwStyle, LONG lParam);
 102 #endif
 103
 104 // ============================================================================
 105 // implementation
 106 // ============================================================================
 107
 108 // ----------------------------------------------------------------------------
 109 // wxFontEnumeratorHelper
 110 // ----------------------------------------------------------------------------
 111
 112 wxFontEnumeratorHelper::wxFontEnumeratorHelper(wxFontEnumerator *fontEnum)
 113 {
 114     m_fontEnum = fontEnum;
 115     m_charset = DEFAULT_CHARSET;
 116     m_fixedOnly = false;
 117     m_enumEncodings = false;
 118 }
 119
 120 void wxFontEnumeratorHelper::SetFamily(const wxString& family)
 121 {
 122     m_enumEncodings = true;
 123     m_family = family;
 124 }
 125
 126 bool wxFontEnumeratorHelper::SetEncoding(wxFontEncoding encoding)
 127 {
 128     if ( encoding != wxFONTENCODING_SYSTEM )
 129     {
 130         wxNativeEncodingInfo info;
 131         if ( !wxGetNativeFontEncoding(encoding, &info) )
 132         {
 133 #if wxUSE_FONTMAP
 134             if ( !wxFontMapper::Get()->GetAltForEncoding(encoding, &info) )
 135 #endif // wxUSE_FONTMAP
 136             {
 137                 // no such encodings at all
 138                 return false;
 139             }
 140         }
 141
 142         m_charset = info.charset;
 143         m_facename = info.facename;
 144     }
 145
 146     return true;
 147 }
 148
 149 #if defined(__GNUWIN32__) && !defined(__CYGWIN10__) && !wxCHECK_W32API_VERSION( 1, 1 ) && !wxUSE_NORLANDER_HEADERS
 150     #define wxFONTENUMPROC int(*)(ENUMLOGFONTEX *, NEWTEXTMETRICEX*, int, LPARAM)
 151 #else
 152     #define wxFONTENUMPROC FONTENUMPROC
 153 #endif
 154
 155 void wxFontEnumeratorHelper::DoEnumerate()
 156 {
 157 #ifndef __WXMICROWIN__
 158     HDC hDC = ::GetDC(NULL);
 159
 160 #ifdef __WXWINCE__
 161     ::EnumFontFamilies(hDC, m_facename, (wxFONTENUMPROC)wxFontEnumeratorProc,
 162                          (LPARAM)this) ;
 163 #else // __WIN32__
 164     LOGFONT lf;
 165     lf.lfCharSet = (BYTE)m_charset;
 166     wxStrncpy(lf.lfFaceName, m_facename, WXSIZEOF(lf.lfFaceName));
 167     lf.lfPitchAndFamily = 0;
 168     ::EnumFontFamiliesEx(hDC, &lf, (wxFONTENUMPROC)wxFontEnumeratorProc,
 169                          (LPARAM)this, 0 /* reserved */) ;
 170 #endif // Win32/CE
 171
 172     ::ReleaseDC(NULL, hDC);
 173 #endif
 174 }
 175
 176 bool wxFontEnumeratorHelper::OnFont(const LPLOGFONT lf,
 177                                     const LPTEXTMETRIC tm) const
 178 {
 179     if ( m_enumEncodings )
 180     {
 181         // is this a new charset?
 182         int cs = lf->lfCharSet;
 183         if ( m_charsets.Index(cs) == wxNOT_FOUND )
 184         {
 185             wxConstCast(this, wxFontEnumeratorHelper)->m_charsets.Add(cs);
 186
 187             wxFontEncoding enc = wxGetFontEncFromCharSet(cs);
 188             return m_fontEnum->OnFontEncoding(lf->lfFaceName,
 189                                               wxFontMapper::GetEncodingName(enc));
 190         }
 191         else
 192         {
 193             // continue enumeration
 194             return true;
 195         }
 196     }
 197
 198     if ( m_fixedOnly )
 199     {
 200         // check that it's a fixed pitch font (there is *no* error here, the
 201         // flag name is misleading!)
 202         if ( tm->tmPitchAndFamily & TMPF_FIXED_PITCH )
 203         {
 204             // not a fixed pitch font
 205             return true;
 206         }
 207     }
 208
 209     if ( m_charset != DEFAULT_CHARSET )
 210     {
 211         // check that we have the right encoding
 212         if ( lf->lfCharSet != m_charset )
 213         {
 214             return true;
 215         }
 216     }
 217     else // enumerating fonts in all charsets
 218     {
 219         // we can get the same facename twice or more in this case because it
 220         // may exist in several charsets but we only want to return one copy of
 221         // it (note that this can't happen for m_charset != DEFAULT_CHARSET)
 222         if ( m_facenames.Index(lf->lfFaceName) != wxNOT_FOUND )
 223         {
 224             // continue enumeration
 225             return true;
 226         }
 227
 228         wxConstCast(this, wxFontEnumeratorHelper)->
 229             m_facenames.Add(lf->lfFaceName);
 230     }
 231
 232     return m_fontEnum->OnFacename(lf->lfFaceName);
 233 }
 234
 235 // ----------------------------------------------------------------------------
 236 // wxFontEnumerator
 237 // ----------------------------------------------------------------------------
 238
 239 bool wxFontEnumerator::EnumerateFacenames(wxFontEncoding encoding,
 240                                           bool fixedWidthOnly)
 241 {
 242     wxFontEnumeratorHelper fe(this);
 243     if ( fe.SetEncoding(encoding) )
 244     {
 245         fe.SetFixedOnly(fixedWidthOnly);
 246
 247         fe.DoEnumerate();
 248     }
 249     // else: no such fonts, unknown encoding
 250
 251     return true;
 252 }
 253
 254 bool wxFontEnumerator::EnumerateEncodings(const wxString& family)
 255 {
 256     wxFontEnumeratorHelper fe(this);
 257     fe.SetFamily(family);
 258     fe.DoEnumerate();
 259
 260     return true;
 261 }
 262
 263 // ----------------------------------------------------------------------------
 264 // Windows callbacks
 265 // ----------------------------------------------------------------------------
 266
 267 #ifndef __WXMICROWIN__
 268 int CALLBACK wxFontEnumeratorProc(LPLOGFONT lplf, LPTEXTMETRIC lptm,
 269                                   DWORD WXUNUSED(dwStyle), LONG lParam)
 270 {
 271
 272     // we used to process TrueType fonts only, but there doesn't seem to be any
 273     // reasons to restrict ourselves to them here
 274 #if 0
 275     // Get rid of any fonts that we don't want...
 276     if ( dwStyle != TRUETYPE_FONTTYPE )
 277     {
 278         // continue enumeration
 279         return TRUE;
 280     }
 281 #endif // 0
 282
 283     wxFontEnumeratorHelper *fontEnum = (wxFontEnumeratorHelper *)lParam;
 284
 285     return fontEnum->OnFont(lplf, lptm);
 286 }
 287 #endif
 288
 289 #endif // wxUSE_FONTMAP