src/gtk/font.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/font.cpp
   3 // Purpose:     wxFont for wxGTK
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling and Julian Smart
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // ============================================================================
  11 // declarations
  12 // ============================================================================
  13
  14 // ----------------------------------------------------------------------------
  15 // headers
  16 // ----------------------------------------------------------------------------
  17
  18 // For compilers that support precompilation, includes "wx.h".
  19 #include "wx/wxprec.h"
  20
  21 #include "wx/font.h"
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/log.h"
  25     #include "wx/utils.h"
  26     #include "wx/settings.h"
  27     #include "wx/gdicmn.h"
  28 #endif
  29
  30 #include "wx/fontutil.h"
  31 #include "wx/tokenzr.h"
  32
  33 #include "wx/gtk/private.h"
  34
  35 // ----------------------------------------------------------------------------
  36 // constants
  37 // ----------------------------------------------------------------------------
  38
  39 // the default size (in points) for the fonts
  40 static const int wxDEFAULT_FONT_SIZE = 12;
  41
  42 // ----------------------------------------------------------------------------
  43 // wxFontRefData
  44 // ----------------------------------------------------------------------------
  45
  46 class wxFontRefData : public wxGDIRefData
  47 {
  48 public:
  49     // from broken down font parameters, also default ctor
  50     wxFontRefData(int size = -1,
  51                   wxFontFamily family = wxFONTFAMILY_DEFAULT,
  52                   wxFontStyle style = wxFONTSTYLE_NORMAL,
  53                   wxFontWeight weight = wxFONTWEIGHT_NORMAL,
  54                   bool underlined = false,
  55                   const wxString& faceName = wxEmptyString,
  56                   wxFontEncoding encoding = wxFONTENCODING_DEFAULT);
  57
  58     wxFontRefData(const wxString& nativeFontInfoString);
  59
  60     // copy ctor
  61     wxFontRefData( const wxFontRefData& data );
  62
  63     virtual ~wxFontRefData();
  64
  65     // setters: all of them also take care to modify m_nativeFontInfo if we
  66     // have it so as to not lose the information not carried by our fields
  67     void SetPointSize(int pointSize);
  68     void SetFamily(wxFontFamily family);
  69     void SetStyle(wxFontStyle style);
  70     void SetWeight(wxFontWeight weight);
  71     void SetUnderlined(bool underlined);
  72     bool SetFaceName(const wxString& facename);
  73     void SetEncoding(wxFontEncoding encoding);
  74
  75     // and this one also modifies all the other font data fields
  76     void SetNativeFontInfo(const wxNativeFontInfo& info);
  77
  78 protected:
  79     // common part of all ctors
  80     void Init(int pointSize,
  81               wxFontFamily family,
  82               wxFontStyle style,
  83               wxFontWeight weight,
  84               bool underlined,
  85               const wxString& faceName,
  86               wxFontEncoding encoding);
  87
  88     // set all fields from (already initialized and valid) m_nativeFontInfo
  89     void InitFromNative();
  90
  91 private:
  92     bool            m_underlined;
  93
  94     // The native font info: basically a PangoFontDescription
  95     wxNativeFontInfo m_nativeFontInfo;
  96
  97     friend class wxFont;
  98 };
  99
 100 #define M_FONTDATA ((wxFontRefData*)m_refData)
 101
 102 // ----------------------------------------------------------------------------
 103 // wxFontRefData
 104 // ----------------------------------------------------------------------------
 105
 106 void wxFontRefData::Init(int pointSize,
 107                          wxFontFamily family,
 108                          wxFontStyle style,
 109                          wxFontWeight weight,
 110                          bool underlined,
 111                          const wxString& faceName,
 112                          wxFontEncoding WXUNUSED(encoding))
 113 {
 114     if (family == wxFONTFAMILY_DEFAULT)
 115         family = wxFONTFAMILY_SWISS;
 116
 117     m_underlined = underlined;
 118
 119     // Create native font info
 120     m_nativeFontInfo.description = pango_font_description_new();
 121
 122     // And set its values
 123     if (!faceName.empty())
 124     {
 125         pango_font_description_set_family( m_nativeFontInfo.description,
 126                                            wxGTK_CONV_SYS(faceName) );
 127     }
 128     else
 129     {
 130         SetFamily(family);
 131     }
 132
 133     SetStyle( style == wxDEFAULT ? wxFONTSTYLE_NORMAL : style );
 134     SetPointSize( (pointSize == wxDEFAULT || pointSize == -1)
 135                     ? wxDEFAULT_FONT_SIZE
 136                     : pointSize );
 137     SetWeight( weight == wxDEFAULT ? wxFONTWEIGHT_NORMAL : weight );
 138 }
 139
 140 void wxFontRefData::InitFromNative()
 141 {
 142     // Get native info
 143     PangoFontDescription *desc = m_nativeFontInfo.description;
 144
 145     // Pango sometimes needs to have a size
 146     int pango_size = pango_font_description_get_size( desc );
 147     if (pango_size == 0)
 148         m_nativeFontInfo.SetPointSize(wxDEFAULT_FONT_SIZE);
 149
 150     // Pango description are never underlined
 151     m_underlined = false;
 152 }
 153
 154 wxFontRefData::wxFontRefData( const wxFontRefData& data )
 155              : wxGDIRefData()
 156 {
 157     m_underlined = data.m_underlined;
 158
 159     // Forces a copy of the internal data.  wxNativeFontInfo should probably
 160     // have a copy ctor and assignment operator to fix this properly but that
 161     // would break binary compatibility...
 162     m_nativeFontInfo.FromString(data.m_nativeFontInfo.ToString());
 163 }
 164
 165 wxFontRefData::wxFontRefData(int size, wxFontFamily family, wxFontStyle style,
 166                              wxFontWeight weight, bool underlined,
 167                              const wxString& faceName,
 168                              wxFontEncoding encoding)
 169 {
 170     Init(size, family, style, weight, underlined, faceName, encoding);
 171 }
 172
 173 wxFontRefData::wxFontRefData(const wxString& nativeFontInfoString)
 174 {
 175     m_nativeFontInfo.FromString( nativeFontInfoString );
 176
 177     InitFromNative();
 178 }
 179
 180 wxFontRefData::~wxFontRefData()
 181 {
 182 }
 183
 184 // ----------------------------------------------------------------------------
 185 // wxFontRefData SetXXX()
 186 // ----------------------------------------------------------------------------
 187
 188 void wxFontRefData::SetPointSize(int pointSize)
 189 {
 190     m_nativeFontInfo.SetPointSize(pointSize);
 191 }
 192
 193 /*
 194     NOTE: disabled because pango_font_description_set_absolute_size() and
 195           wxDC::GetCharHeight() do not mix well: setting with the former a pixel
 196           size of "30" makes the latter return 36...
 197           Besides, we need to return GetPointSize() a point size value even if
 198           SetPixelSize() was used and this would require further changes
 199           (and use of pango_font_description_get_size_is_absolute in some places).
 200
 201 bool wxFontRefData::SetPixelSize(const wxSize& pixelSize)
 202 {
 203     wxCHECK_MSG( pixelSize.GetWidth() >= 0 && pixelSize.GetHeight() > 0, false,
 204                  "Negative values for the pixel size or zero pixel height are not allowed" );
 205
 206     if (wx_pango_version_check(1,8,0) != NULL ||
 207         pixelSize.GetWidth() != 0)
 208     {
 209         // NOTE: pango_font_description_set_absolute_size() only sets the font height;
 210         //       if the user set the pixel width of the font explicitly or the pango
 211         //       library is too old, we cannot proceed
 212         return false;
 213     }
 214
 215     pango_font_description_set_absolute_size( m_nativeFontInfo.description,
 216                                               pixelSize.GetHeight() * PANGO_SCALE );
 217
 218     return true;
 219 }
 220 */
 221
 222 void wxFontRefData::SetFamily(wxFontFamily family)
 223 {
 224     m_nativeFontInfo.SetFamily(family);
 225 }
 226
 227 void wxFontRefData::SetStyle(wxFontStyle style)
 228 {
 229     m_nativeFontInfo.SetStyle(style);
 230 }
 231
 232 void wxFontRefData::SetWeight(wxFontWeight weight)
 233 {
 234     m_nativeFontInfo.SetWeight(weight);
 235 }
 236
 237 void wxFontRefData::SetUnderlined(bool underlined)
 238 {
 239     m_underlined = underlined;
 240
 241     // the Pango font descriptor does not have an underlined attribute
 242     // (and wxNativeFontInfo::SetUnderlined asserts); rather it's
 243     // wxWindowDCImpl::DoDrawText that handles underlined fonts, so we
 244     // here we just need to save the underlined attribute
 245 }
 246
 247 bool wxFontRefData::SetFaceName(const wxString& facename)
 248 {
 249     return m_nativeFontInfo.SetFaceName(facename);
 250 }
 251
 252 void wxFontRefData::SetEncoding(wxFontEncoding WXUNUSED(encoding))
 253 {
 254     // with GTK+ 2 Pango always uses UTF8 internally, we cannot change it
 255 }
 256
 257 void wxFontRefData::SetNativeFontInfo(const wxNativeFontInfo& info)
 258 {
 259     m_nativeFontInfo = info;
 260
 261     // set all the other font parameters from the native font info
 262     InitFromNative();
 263 }
 264
 265 // ----------------------------------------------------------------------------
 266 // wxFont creation
 267 // ----------------------------------------------------------------------------
 268
 269 IMPLEMENT_DYNAMIC_CLASS(wxFont, wxGDIObject)
 270
 271 wxFont::wxFont(const wxNativeFontInfo& info)
 272 {
 273     Create( info.GetPointSize(),
 274             info.GetFamily(),
 275             info.GetStyle(),
 276             info.GetWeight(),
 277             info.GetUnderlined(),
 278             info.GetFaceName(),
 279             info.GetEncoding() );
 280 }
 281
 282 bool wxFont::Create( int pointSize,
 283                      wxFontFamily family,
 284                      wxFontStyle style,
 285                      wxFontWeight weight,
 286                      bool underlined,
 287                      const wxString& face,
 288                      wxFontEncoding encoding )
 289 {
 290     UnRef();
 291
 292     m_refData = new wxFontRefData(pointSize, family, style, weight,
 293                                   underlined, face, encoding);
 294
 295     return true;
 296 }
 297
 298 bool wxFont::Create(const wxString& fontname)
 299 {
 300     // VZ: does this really happen?
 301     if ( fontname.empty() )
 302     {
 303         *this = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
 304
 305         return true;
 306     }
 307
 308     m_refData = new wxFontRefData(fontname);
 309
 310     return true;
 311 }
 312
 313 wxFont::~wxFont()
 314 {
 315 }
 316
 317 // ----------------------------------------------------------------------------
 318 // accessors
 319 // ----------------------------------------------------------------------------
 320
 321 int wxFont::GetPointSize() const
 322 {
 323     wxCHECK_MSG( IsOk(), 0, wxT("invalid font") );
 324
 325     return M_FONTDATA->m_nativeFontInfo.GetPointSize();
 326 }
 327
 328 wxString wxFont::GetFaceName() const
 329 {
 330     wxCHECK_MSG( IsOk(), wxEmptyString, wxT("invalid font") );
 331
 332     return M_FONTDATA->m_nativeFontInfo.GetFaceName();
 333 }
 334
 335 wxFontFamily wxFont::DoGetFamily() const
 336 {
 337     return M_FONTDATA->m_nativeFontInfo.GetFamily();
 338 }
 339
 340 wxFontStyle wxFont::GetStyle() const
 341 {
 342     wxCHECK_MSG( IsOk(), wxFONTSTYLE_MAX, wxT("invalid font") );
 343
 344     return M_FONTDATA->m_nativeFontInfo.GetStyle();
 345 }
 346
 347 wxFontWeight wxFont::GetWeight() const
 348 {
 349     wxCHECK_MSG( IsOk(), wxFONTWEIGHT_MAX, wxT("invalid font") );
 350
 351     return M_FONTDATA->m_nativeFontInfo.GetWeight();
 352 }
 353
 354 bool wxFont::GetUnderlined() const
 355 {
 356     wxCHECK_MSG( IsOk(), false, wxT("invalid font") );
 357
 358     return M_FONTDATA->m_underlined;
 359 }
 360
 361 wxFontEncoding wxFont::GetEncoding() const
 362 {
 363     wxCHECK_MSG( IsOk(), wxFONTENCODING_SYSTEM, wxT("invalid font") );
 364
 365     return wxFONTENCODING_UTF8;
 366         // Pango always uses UTF8... see also SetEncoding()
 367 }
 368
 369 const wxNativeFontInfo *wxFont::GetNativeFontInfo() const
 370 {
 371     wxCHECK_MSG( IsOk(), NULL, wxT("invalid font") );
 372
 373     return &(M_FONTDATA->m_nativeFontInfo);
 374 }
 375
 376 bool wxFont::IsFixedWidth() const
 377 {
 378     wxCHECK_MSG( IsOk(), false, wxT("invalid font") );
 379
 380     return wxFontBase::IsFixedWidth();
 381 }
 382
 383 // ----------------------------------------------------------------------------
 384 // change font attributes
 385 // ----------------------------------------------------------------------------
 386
 387 void wxFont::SetPointSize(int pointSize)
 388 {
 389     AllocExclusive();
 390
 391     M_FONTDATA->SetPointSize(pointSize);
 392 }
 393
 394 void wxFont::SetFamily(wxFontFamily family)
 395 {
 396     AllocExclusive();
 397
 398     M_FONTDATA->SetFamily(family);
 399 }
 400
 401 void wxFont::SetStyle(wxFontStyle style)
 402 {
 403     AllocExclusive();
 404
 405     M_FONTDATA->SetStyle(style);
 406 }
 407
 408 void wxFont::SetWeight(wxFontWeight weight)
 409 {
 410     AllocExclusive();
 411
 412     M_FONTDATA->SetWeight(weight);
 413 }
 414
 415 bool wxFont::SetFaceName(const wxString& faceName)
 416 {
 417     AllocExclusive();
 418
 419     return M_FONTDATA->SetFaceName(faceName) &&
 420            wxFontBase::SetFaceName(faceName);
 421 }
 422
 423 void wxFont::SetUnderlined(bool underlined)
 424 {
 425     AllocExclusive();
 426
 427     M_FONTDATA->SetUnderlined(underlined);
 428 }
 429
 430 void wxFont::SetEncoding(wxFontEncoding encoding)
 431 {
 432     AllocExclusive();
 433
 434     M_FONTDATA->SetEncoding(encoding);
 435 }
 436
 437 void wxFont::DoSetNativeFontInfo( const wxNativeFontInfo& info )
 438 {
 439     AllocExclusive();
 440
 441     M_FONTDATA->SetNativeFontInfo( info );
 442 }
 443
 444 wxGDIRefData* wxFont::CreateGDIRefData() const
 445 {
 446     return new wxFontRefData;
 447 }
 448
 449 wxGDIRefData* wxFont::CloneGDIRefData(const wxGDIRefData* data) const
 450 {
 451     return new wxFontRefData(*static_cast<const wxFontRefData*>(data));
 452 }