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 #ifdef __GNUG__
  21     #pragma implementation "fontenum.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28   #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_FONTMAP
  32
  33 #ifndef WX_PRECOMP
  34   #include "wx/font.h"
  35 #endif
  36
  37 #include "wx/fontutil.h"
  38 #include "wx/fontenum.h"
  39 #include "wx/fontmap.h"
  40
  41 #include "wx/msw/private.h"
  42
  43 // ----------------------------------------------------------------------------
  44 // private classes
  45 // ----------------------------------------------------------------------------
  46
  47 // the helper class which calls ::EnumFontFamilies() and whose OnFont() is
  48 // called from the callback passed to this function and, in its turn, calls the
  49 // appropariate wxFontEnumerator method
  50 class wxFontEnumeratorHelper
  51 {
  52 public:
  53     wxFontEnumeratorHelper(wxFontEnumerator *fontEnum);
  54
  55     // control what exactly are we enumerating
  56         // we enumerate fonts with given enocding
  57     bool SetEncoding(wxFontEncoding encoding);
  58         // we enumerate fixed-width fonts
  59     void SetFixedOnly(bool fixedOnly) { m_fixedOnly = fixedOnly; }
  60         // we enumerate the encodings available in this family
  61     void SetFamily(const wxString& family);
  62
  63     // call to start enumeration
  64     void DoEnumerate();
  65
  66     // called by our font enumeration proc
  67     bool OnFont(const LPLOGFONT lf, const LPTEXTMETRIC tm) const;
  68
  69 private:
  70     // the object we forward calls to OnFont() to
  71     wxFontEnumerator *m_fontEnum;
  72
  73     // if != -1, enum only fonts which have this encoding
  74     int m_charset;
  75
  76     // if not empty, enum only the fonts with this facename
  77     wxString m_facename;
  78
  79     // if not empty, enum only the fonts in this family
  80     wxString m_family;
  81
  82     // if TRUE, enum only fixed fonts
  83     bool m_fixedOnly;
  84
  85     // if TRUE, we enumerate the encodings, not fonts
  86     bool m_enumEncodings;
  87
  88     // the list of charsets we already found while enumerating charsets
  89     wxArrayInt m_charsets;
  90
  91     // the list of facenames we already found while enumerating facenames
  92     wxArrayString m_facenames;
  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 ( !wxTheFontMapper->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__)
 150     #if wxUSE_NORLANDER_HEADERS
 151         #define wxFONTENUMPROC int(*)(const LOGFONT *, const TEXTMETRIC *, long unsigned int, LPARAM)
 152     #else
 153         #define wxFONTENUMPROC int(*)(ENUMLOGFONTEX *, NEWTEXTMETRICEX*, int, LPARAM)
 154     #endif
 155 #else
 156     #define wxFONTENUMPROC FONTENUMPROC
 157 #endif
 158
 159 void wxFontEnumeratorHelper::DoEnumerate()
 160 {
 161 #ifndef __WXMICROWIN__
 162     HDC hDC = ::GetDC(NULL);
 163
 164 #ifdef __WIN32__
 165     LOGFONT lf;
 166     lf.lfCharSet = m_charset;
 167     wxStrncpy(lf.lfFaceName, m_facename, WXSIZEOF(lf.lfFaceName));
 168     lf.lfPitchAndFamily = 0;
 169     ::EnumFontFamiliesEx(hDC, &lf, (wxFONTENUMPROC)wxFontEnumeratorProc,
 170                          (LPARAM)this, 0 /* reserved */) ;
 171 #else // Win16
 172     ::EnumFonts(hDC, (LPTSTR)NULL, (FONTENUMPROC)wxFontEnumeratorProc,
 173     #ifdef STRICT
 174                (LPARAM)
 175     #else
 176                (LPSTR)
 177     #endif
 178                this);
 179 #endif // Win32/16
 180
 181     ::ReleaseDC(NULL, hDC);
 182 #endif
 183 }
 184
 185 bool wxFontEnumeratorHelper::OnFont(const LPLOGFONT lf,
 186                                     const LPTEXTMETRIC tm) const
 187 {
 188     if ( m_enumEncodings )
 189     {
 190         // is this a new charset?
 191         int cs = lf->lfCharSet;
 192         if ( m_charsets.Index(cs) == wxNOT_FOUND )
 193         {
 194             wxConstCast(this, wxFontEnumeratorHelper)->m_charsets.Add(cs);
 195
 196             wxFontEncoding enc = wxGetFontEncFromCharSet(cs);
 197             return m_fontEnum->OnFontEncoding(lf->lfFaceName,
 198                                               wxFontMapper::GetEncodingName(enc));
 199         }
 200         else
 201         {
 202             // continue enumeration
 203             return TRUE;
 204         }
 205     }
 206
 207     if ( m_fixedOnly )
 208     {
 209         // check that it's a fixed pitch font (there is *no* error here, the
 210         // flag name is misleading!)
 211         if ( tm->tmPitchAndFamily & TMPF_FIXED_PITCH )
 212         {
 213             // not a fixed pitch font
 214             return TRUE;
 215         }
 216     }
 217
 218     if ( m_charset != DEFAULT_CHARSET )
 219     {
 220         // check that we have the right encoding
 221         if ( lf->lfCharSet != m_charset )
 222         {
 223             return TRUE;
 224         }
 225     }
 226     else // enumerating fonts in all charsets
 227     {
 228         // we can get the same facename twice or more in this case because it
 229         // may exist in several charsets but we only want to return one copy of
 230         // it (note that this can't happen for m_charset != DEFAULT_CHARSET)
 231         if ( m_facenames.Index(lf->lfFaceName) != wxNOT_FOUND )
 232         {
 233             // continue enumeration
 234             return TRUE;
 235         }
 236
 237         wxConstCast(this, wxFontEnumeratorHelper)->
 238             m_facenames.Add(lf->lfFaceName);
 239     }
 240
 241     return m_fontEnum->OnFacename(lf->lfFaceName);
 242 }
 243
 244 // ----------------------------------------------------------------------------
 245 // wxFontEnumerator
 246 // ----------------------------------------------------------------------------
 247
 248 bool wxFontEnumerator::EnumerateFacenames(wxFontEncoding encoding,
 249                                           bool fixedWidthOnly)
 250 {
 251     wxFontEnumeratorHelper fe(this);
 252     if ( fe.SetEncoding(encoding) )
 253     {
 254         fe.SetFixedOnly(fixedWidthOnly);
 255
 256         fe.DoEnumerate();
 257     }
 258     // else: no such fonts, unknown encoding
 259
 260     return TRUE;
 261 }
 262
 263 bool wxFontEnumerator::EnumerateEncodings(const wxString& family)
 264 {
 265     wxFontEnumeratorHelper fe(this);
 266     fe.SetFamily(family);
 267     fe.DoEnumerate();
 268
 269     return TRUE;
 270 }
 271
 272 // ----------------------------------------------------------------------------
 273 // Windows callbacks
 274 // ----------------------------------------------------------------------------
 275
 276 #ifndef __WXMICROWIN__
 277 int CALLBACK wxFontEnumeratorProc(LPLOGFONT lplf, LPTEXTMETRIC lptm,
 278                                   DWORD dwStyle, LONG lParam)
 279 {
 280     // we used to process TrueType fonts only, but there doesn't seem to be any
 281     // reasons to restrict ourselves to them here
 282 #if 0
 283     // Get rid of any fonts that we don't want...
 284     if ( dwStyle != TRUETYPE_FONTTYPE )
 285     {
 286         // continue enumeration
 287         return TRUE;
 288     }
 289 #endif // 0
 290
 291     wxFontEnumeratorHelper *fontEnum = (wxFontEnumeratorHelper *)lParam;
 292
 293     return fontEnum->OnFont(lplf, lptm);
 294 }
 295 #endif
 296
 297 #endif // wxUSE_FONTMAP