samples/font/font.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        font.cpp
   3 // Purpose:     wxFont demo
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     30.09.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1999 Vadim Zeitlin
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx/wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 // for all others, include the necessary headers (this file is usually all you
  20 // need because it includes almost all standard wxWidgets headers
  21 #ifndef WX_PRECOMP
  22     #include "wx/wx.h"
  23
  24     #include "wx/log.h"
  25 #endif
  26
  27 #include "wx/choicdlg.h"
  28 #include "wx/fontdlg.h"
  29 #include "wx/fontenum.h"
  30 #include "wx/fontmap.h"
  31 #include "wx/encconv.h"
  32 #include "wx/splitter.h"
  33 #include "wx/textfile.h"
  34
  35 #undef wxFontDialog
  36 #include "wx/mac/fontdlg.h"
  37
  38 // ----------------------------------------------------------------------------
  39 // private classes
  40 // ----------------------------------------------------------------------------
  41
  42 // Define a new application type, each program should derive a class from wxApp
  43 class MyApp : public wxApp
  44 {
  45 public:
  46     // override base class virtuals
  47     // ----------------------------
  48
  49     // this one is called on application startup and is a good place for the app
  50     // initialization (doing it here and not in the ctor allows to have an error
  51     // return: if OnInit() returns false, the application terminates)
  52     virtual bool OnInit();
  53 };
  54
  55 // MyCanvas is a canvas on which we show the font sample
  56 class MyCanvas: public wxWindow
  57 {
  58 public:
  59     MyCanvas( wxWindow *parent );
  60     virtual ~MyCanvas();
  61
  62     // accessors for the frame
  63     const wxFont& GetTextFont() const { return m_font; }
  64     const wxColour& GetColour() const { return m_colour; }
  65     void SetTextFont(const wxFont& font) { m_font = font; }
  66     void SetColour(const wxColour& colour) { m_colour = colour; }
  67
  68     // event handlers
  69     void OnPaint( wxPaintEvent &event );
  70
  71 private:
  72     wxColour m_colour;
  73     wxFont   m_font;
  74
  75     DECLARE_EVENT_TABLE()
  76 };
  77
  78 // Define a new frame type: this is going to be our main frame
  79 class MyFrame : public wxFrame
  80 {
  81 public:
  82     // ctor(s)
  83     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  84
  85     // accessors
  86     MyCanvas *GetCanvas() const { return m_canvas; }
  87
  88     // event handlers (these functions should _not_ be virtual)
  89     void OnQuit(wxCommandEvent& event);
  90     void OnAbout(wxCommandEvent& event);
  91
  92     void OnIncFont(wxCommandEvent& WXUNUSED(event)) { DoResizeFont(+2); }
  93     void OnDecFont(wxCommandEvent& WXUNUSED(event)) { DoResizeFont(-2); }
  94
  95     void OnBold(wxCommandEvent& event);
  96     void OnItalic(wxCommandEvent& event);
  97     void OnUnderline(wxCommandEvent& event);
  98
  99     void OnwxPointerFont(wxCommandEvent& event);
 100
 101     void OnViewMsg(wxCommandEvent& event);
 102     void OnSelectFont(wxCommandEvent& event);
 103     void OnEnumerateFamiliesForEncoding(wxCommandEvent& event);
 104     void OnEnumerateFamilies(wxCommandEvent& WXUNUSED(event))
 105         { DoEnumerateFamilies(false); }
 106     void OnEnumerateFixedFamilies(wxCommandEvent& WXUNUSED(event))
 107         { DoEnumerateFamilies(true); }
 108     void OnEnumerateEncodings(wxCommandEvent& event);
 109
 110     void OnCheckNativeToFromString(wxCommandEvent& event);
 111
 112 protected:
 113     bool DoEnumerateFamilies(bool fixedWidthOnly,
 114                              wxFontEncoding encoding = wxFONTENCODING_SYSTEM,
 115                              bool silent = false);
 116
 117     void DoResizeFont(int diff);
 118     void DoChangeFont(const wxFont& font, const wxColour& col = wxNullColour);
 119
 120     size_t      m_fontSize; // in points
 121
 122     wxTextCtrl *m_textctrl;
 123     MyCanvas   *m_canvas;
 124
 125 private:
 126     // any class wishing to process wxWidgets events must use this macro
 127     DECLARE_EVENT_TABLE()
 128 };
 129
 130 // ----------------------------------------------------------------------------
 131 // constants
 132 // ----------------------------------------------------------------------------
 133
 134 // IDs for the controls and the menu commands
 135 enum
 136 {
 137     // menu items
 138     Font_Quit = 1,
 139     Font_About,
 140     Font_ViewMsg,
 141     Font_IncSize,
 142     Font_DecSize,
 143     Font_Bold,
 144     Font_Italic,
 145     Font_Underlined,
 146     Font_wxNORMAL_FONT,
 147     Font_wxSMALL_FONT,
 148     Font_wxITALIC_FONT,
 149     Font_wxSWISS_FONT,
 150     Font_Standard,
 151
 152     Font_Choose = 100,
 153     Font_EnumFamiliesForEncoding,
 154     Font_EnumFamilies,
 155     Font_EnumFixedFamilies,
 156     Font_EnumEncodings,
 157     Font_CheckNativeToFromString,
 158     Font_Max
 159 };
 160
 161 // ----------------------------------------------------------------------------
 162 // event tables and other macros for wxWidgets
 163 // ----------------------------------------------------------------------------
 164
 165 // the event tables connect the wxWidgets events with the functions (event
 166 // handlers) which process them. It can be also done at run-time, but for the
 167 // simple menu events like this the static method is much simpler.
 168 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 169     EVT_MENU(Font_Quit,  MyFrame::OnQuit)
 170     EVT_MENU(Font_ViewMsg, MyFrame::OnViewMsg)
 171     EVT_MENU(Font_About, MyFrame::OnAbout)
 172
 173     EVT_MENU(Font_IncSize, MyFrame::OnIncFont)
 174     EVT_MENU(Font_DecSize, MyFrame::OnDecFont)
 175     EVT_MENU(Font_Bold, MyFrame::OnBold)
 176     EVT_MENU(Font_Italic, MyFrame::OnItalic)
 177     EVT_MENU(Font_Underlined, MyFrame::OnUnderline)
 178
 179     EVT_MENU(Font_wxNORMAL_FONT, MyFrame::OnwxPointerFont)
 180     EVT_MENU(Font_wxSMALL_FONT, MyFrame::OnwxPointerFont)
 181     EVT_MENU(Font_wxITALIC_FONT, MyFrame::OnwxPointerFont)
 182     EVT_MENU(Font_wxSWISS_FONT, MyFrame::OnwxPointerFont)
 183
 184     EVT_MENU(Font_CheckNativeToFromString, MyFrame::OnCheckNativeToFromString)
 185
 186     EVT_MENU(Font_Choose, MyFrame::OnSelectFont)
 187     EVT_MENU(Font_EnumFamiliesForEncoding, MyFrame::OnEnumerateFamiliesForEncoding)
 188     EVT_MENU(Font_EnumFamilies, MyFrame::OnEnumerateFamilies)
 189     EVT_MENU(Font_EnumFixedFamilies, MyFrame::OnEnumerateFixedFamilies)
 190     EVT_MENU(Font_EnumEncodings, MyFrame::OnEnumerateEncodings)
 191 END_EVENT_TABLE()
 192
 193 // Create a new application object: this macro will allow wxWidgets to create
 194 // the application object during program execution (it's better than using a
 195 // static object for many reasons) and also declares the accessor function
 196 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 197 // not wxApp)
 198 IMPLEMENT_APP(MyApp)
 199
 200 // ============================================================================
 201 // implementation
 202 // ============================================================================
 203
 204 // ----------------------------------------------------------------------------
 205 // the application class
 206 // ----------------------------------------------------------------------------
 207
 208 // `Main program' equivalent: the program execution "starts" here
 209 bool MyApp::OnInit()
 210 {
 211     // Create the main application window
 212     MyFrame *frame = new MyFrame(wxT("Font wxWidgets demo"),
 213                                  wxPoint(50, 50), wxSize(600, 400));
 214
 215     // Show it and tell the application that it's our main window
 216     frame->Show(true);
 217     SetTopWindow(frame);
 218
 219     // success: wxApp::OnRun() will be called which will enter the main message
 220     // loop and the application will run. If we returned 'false' here, the
 221     // application would exit immediately.
 222     return true;
 223 }
 224
 225 // ----------------------------------------------------------------------------
 226 // main frame
 227 // ----------------------------------------------------------------------------
 228
 229 // frame constructor
 230 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 231        : wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size), m_textctrl(NULL)
 232 {
 233     m_fontSize = 12;
 234
 235     // create a menu bar
 236     wxMenu *menuFile = new wxMenu;
 237
 238     menuFile->Append(Font_ViewMsg, wxT("&View...\tCtrl-V"),
 239                      wxT("View an email message file"));
 240     menuFile->AppendSeparator();
 241     menuFile->Append(Font_About, wxT("&About...\tCtrl-A"), wxT("Show about dialog"));
 242     menuFile->AppendSeparator();
 243     menuFile->Append(Font_Quit, wxT("E&xit\tAlt-X"), wxT("Quit this program"));
 244
 245     wxMenu *menuFont = new wxMenu;
 246     menuFont->Append(Font_IncSize, wxT("&Increase font size by 2 points\tCtrl-I"));
 247     menuFont->Append(Font_DecSize, wxT("&Decrease font size by 2 points\tCtrl-D"));
 248     menuFont->AppendSeparator();
 249     menuFont->AppendCheckItem(Font_Bold, wxT("&Bold\tCtrl-B"), wxT("Toggle bold state"));
 250     menuFont->AppendCheckItem(Font_Italic, wxT("&Oblique\tCtrl-O"), wxT("Toggle italic state"));
 251     menuFont->AppendCheckItem(Font_Underlined, wxT("&Underlined\tCtrl-U"),
 252                      wxT("Toggle underlined state"));
 253
 254     menuFont->AppendSeparator();
 255     menuFont->Append(Font_CheckNativeToFromString,
 256                      wxT("Check Native Font Info To/From String"));
 257
 258     wxMenu *menuSelect = new wxMenu;
 259     menuSelect->Append(Font_Choose, wxT("&Select font...\tCtrl-S"),
 260                      wxT("Select a standard font"));
 261
 262     wxMenu *menuStdFonts = new wxMenu;
 263     menuStdFonts->Append(Font_wxNORMAL_FONT, wxT("wxNORMAL_FONT"), wxT("Normal font used by wxWidgets"));
 264     menuStdFonts->Append(Font_wxSMALL_FONT,  wxT("wxSMALL_FONT"),  wxT("Small font used by wxWidgets"));
 265     menuStdFonts->Append(Font_wxITALIC_FONT, wxT("wxITALIC_FONT"), wxT("Italic font used by wxWidgets"));
 266     menuStdFonts->Append(Font_wxSWISS_FONT,  wxT("wxSWISS_FONT"),  wxT("Swiss font used by wxWidgets"));
 267     menuSelect->Append(Font_Standard, wxT("Standar&d fonts"), menuStdFonts);
 268
 269     menuSelect->AppendSeparator();
 270     menuSelect->Append(Font_EnumFamilies, wxT("Enumerate font &families\tCtrl-F"));
 271     menuSelect->Append(Font_EnumFixedFamilies,
 272                      wxT("Enumerate fi&xed font families\tCtrl-X"));
 273     menuSelect->Append(Font_EnumEncodings,
 274                      wxT("Enumerate &encodings\tCtrl-E"));
 275     menuSelect->Append(Font_EnumFamiliesForEncoding,
 276                      wxT("Find font for en&coding...\tCtrl-C"),
 277                      wxT("Find font families for given encoding"));
 278
 279     // now append the freshly created menu to the menu bar...
 280     wxMenuBar *menuBar = new wxMenuBar;
 281     menuBar->Append(menuFile, wxT("&File"));
 282     menuBar->Append(menuFont, wxT("F&ont"));
 283     menuBar->Append(menuSelect, wxT("&Select"));
 284
 285     // ... and attach this menu bar to the frame
 286     SetMenuBar(menuBar);
 287
 288     wxSplitterWindow *splitter = new wxSplitterWindow(this);
 289
 290     m_textctrl = new wxTextCtrl(splitter, wxID_ANY,
 291                                 wxT("Paste text here to see how it looks\nlike in the given font"),
 292                                 wxDefaultPosition, wxDefaultSize,
 293                                 wxTE_MULTILINE);
 294
 295     m_canvas = new MyCanvas(splitter);
 296
 297     splitter->SplitHorizontally(m_textctrl, m_canvas, 100);
 298
 299 #if wxUSE_STATUSBAR
 300     // create a status bar just for fun (by default with 1 pane only)
 301     CreateStatusBar();
 302     SetStatusText(wxT("Welcome to wxWidgets font demo!"));
 303 #endif // wxUSE_STATUSBAR
 304 }
 305
 306 // --------------------------------------------------------
 307
 308 class MyEncodingEnumerator : public wxFontEnumerator
 309 {
 310 public:
 311     MyEncodingEnumerator()
 312         { m_n = 0; }
 313
 314     const wxString& GetText() const
 315         { return m_text; }
 316
 317 protected:
 318     virtual bool OnFontEncoding(const wxString& facename,
 319                                 const wxString& encoding)
 320     {
 321         wxString text;
 322         text.Printf(wxT("Encoding %u: %s (available in facename '%s')\n"),
 323                     (unsigned int) ++m_n, encoding.c_str(), facename.c_str());
 324         m_text += text;
 325         return true;
 326     }
 327
 328 private:
 329     size_t m_n;
 330     wxString m_text;
 331 };
 332
 333 void MyFrame::OnEnumerateEncodings(wxCommandEvent& WXUNUSED(event))
 334 {
 335     MyEncodingEnumerator fontEnumerator;
 336
 337     fontEnumerator.EnumerateEncodings();
 338
 339     wxLogMessage(wxT("Enumerating all available encodings:\n%s"),
 340                  fontEnumerator.GetText().c_str());
 341 }
 342
 343 // -------------------------------------------------------------
 344
 345 class MyFontEnumerator : public wxFontEnumerator
 346 {
 347 public:
 348     bool GotAny() const
 349         { return !m_facenames.IsEmpty(); }
 350
 351     const wxArrayString& GetFacenames() const
 352         { return m_facenames; }
 353
 354 protected:
 355     virtual bool OnFacename(const wxString& facename)
 356     {
 357         m_facenames.Add(facename);
 358         return true;
 359     }
 360
 361     private:
 362         wxArrayString m_facenames;
 363 } fontEnumerator;
 364
 365 bool MyFrame::DoEnumerateFamilies(bool fixedWidthOnly,
 366                                   wxFontEncoding encoding,
 367                                   bool silent)
 368 {
 369     MyFontEnumerator fontEnumerator;
 370
 371     fontEnumerator.EnumerateFacenames(encoding, fixedWidthOnly);
 372
 373     if ( fontEnumerator.GotAny() )
 374     {
 375         int nFacenames = fontEnumerator.GetFacenames().GetCount();
 376         if ( !silent )
 377         {
 378             wxLogStatus(this, wxT("Found %d %sfonts"),
 379                         nFacenames, fixedWidthOnly ? wxT("fixed width ") : wxT(""));
 380         }
 381
 382         wxString facename;
 383         if ( silent )
 384         {
 385             // choose the first
 386             facename = fontEnumerator.GetFacenames().Item(0);
 387         }
 388         else
 389         {
 390             // let the user choose
 391             wxString *facenames = new wxString[nFacenames];
 392             int n;
 393             for ( n = 0; n < nFacenames; n++ )
 394                 facenames[n] = fontEnumerator.GetFacenames().Item(n);
 395
 396             n = wxGetSingleChoiceIndex(wxT("Choose a facename"), wxT("Font demo"),
 397                                        nFacenames, facenames, this);
 398
 399             if ( n != -1 )
 400                 facename = facenames[n];
 401
 402             delete [] facenames;
 403         }
 404
 405         if ( !facename.IsEmpty() )
 406         {
 407             wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 408                         wxFONTWEIGHT_NORMAL, false, facename, encoding);
 409
 410             DoChangeFont(font);
 411         }
 412
 413         return true;
 414     }
 415     else if ( !silent )
 416     {
 417         wxLogWarning(wxT("No such fonts found."));
 418     }
 419
 420     return false;
 421 }
 422
 423 void MyFrame::OnEnumerateFamiliesForEncoding(wxCommandEvent& WXUNUSED(event))
 424 {
 425     static wxFontEncoding encodings[] =
 426     {
 427         wxFONTENCODING_ISO8859_1,
 428         wxFONTENCODING_ISO8859_2,
 429         wxFONTENCODING_ISO8859_5,
 430         wxFONTENCODING_ISO8859_7,
 431         wxFONTENCODING_ISO8859_15,
 432         wxFONTENCODING_KOI8,
 433         wxFONTENCODING_KOI8_U,
 434         wxFONTENCODING_CP1250,
 435         wxFONTENCODING_CP1251,
 436         wxFONTENCODING_CP1252,
 437     };
 438
 439     static const wxString encodingNames[] =
 440     {
 441         wxT("Western European (ISO-8859-1)"),
 442         wxT("Central European (ISO-8859-2)"),
 443         wxT("Cyrillic (ISO-8859-5)"),
 444         wxT("Greek (ISO-8859-7)"),
 445         wxT("Western European with Euro (ISO-8859-15)"),
 446         wxT("KOI8-R"),
 447         wxT("KOI8-U"),
 448         wxT("Windows Central European (CP 1250)"),
 449         wxT("Windows Cyrillic (CP 1251)"),
 450         wxT("Windows Western European (CP 1252)"),
 451     };
 452
 453     int n = wxGetSingleChoiceIndex(wxT("Choose an encoding"), wxT("Font demo"),
 454                                    WXSIZEOF(encodingNames),
 455                                    encodingNames,
 456                                    this);
 457
 458     if ( n != -1 )
 459     {
 460         DoEnumerateFamilies(false, encodings[n]);
 461     }
 462 }
 463
 464 void MyFrame::OnCheckNativeToFromString(wxCommandEvent& WXUNUSED(event))
 465 {
 466     wxString fontInfo = m_canvas->GetTextFont().GetNativeFontInfoDesc();
 467
 468     if ( fontInfo.IsEmpty() )
 469     {
 470         wxLogError(wxT("Native font info string is empty!"));
 471     }
 472     else
 473     {
 474         wxFont *font = wxFont::New(fontInfo);
 475         if ( fontInfo != font->GetNativeFontInfoDesc() )
 476             wxLogError(wxT("wxNativeFontInfo ToString()/FromString() broken!"));
 477         else
 478             wxLogMessage(wxT("wxNativeFontInfo works: %s"), fontInfo.c_str());
 479
 480         delete font;
 481      }
 482 }
 483
 484 void MyFrame::DoResizeFont(int diff)
 485 {
 486     wxFont font = m_canvas->GetTextFont();
 487
 488     font.SetPointSize(font.GetPointSize() + diff);
 489     DoChangeFont(font);
 490 }
 491
 492 void MyFrame::OnBold(wxCommandEvent& event)
 493 {
 494     wxFont font = m_canvas->GetTextFont();
 495
 496     font.SetWeight(event.IsChecked() ? wxFONTWEIGHT_BOLD : wxFONTWEIGHT_NORMAL);
 497     DoChangeFont(font);
 498 }
 499
 500 void MyFrame::OnItalic(wxCommandEvent& event)
 501 {
 502     wxFont font = m_canvas->GetTextFont();
 503
 504     font.SetStyle(event.IsChecked() ? wxFONTSTYLE_ITALIC : wxFONTSTYLE_NORMAL);
 505     DoChangeFont(font);
 506 }
 507
 508 void MyFrame::OnUnderline(wxCommandEvent& event)
 509 {
 510     wxFont font = m_canvas->GetTextFont();
 511
 512     font.SetUnderlined(event.IsChecked());
 513     DoChangeFont(font);
 514 }
 515
 516 void MyFrame::OnwxPointerFont(wxCommandEvent& event)
 517 {
 518     wxFont font;
 519
 520     switch (event.GetId())
 521     {
 522         case Font_wxNORMAL_FONT : font = wxFont(*wxNORMAL_FONT); break;
 523         case Font_wxSMALL_FONT  : font = wxFont(*wxSMALL_FONT); break;
 524         case Font_wxITALIC_FONT : font = wxFont(*wxITALIC_FONT); break;
 525         case Font_wxSWISS_FONT  : font = wxFont(*wxSWISS_FONT); break;
 526         default                 : font = wxFont(*wxNORMAL_FONT); break;
 527     }
 528
 529     GetMenuBar()->Check(Font_Bold, false);
 530     GetMenuBar()->Check(Font_Italic, false);
 531     GetMenuBar()->Check(Font_Underlined, false);
 532
 533     DoChangeFont(font);
 534 }
 535
 536 void MyFrame::DoChangeFont(const wxFont& font, const wxColour& col)
 537 {
 538     m_canvas->SetTextFont(font);
 539     if ( col.Ok() )
 540         m_canvas->SetColour(col);
 541     m_canvas->Refresh();
 542
 543     m_textctrl->SetFont(font);
 544     if ( col.Ok() )
 545         m_textctrl->SetForegroundColour(col);
 546 }
 547
 548 void MyFrame::OnSelectFont(wxCommandEvent& WXUNUSED(event))
 549 {
 550     wxFontData data;
 551     data.SetInitialFont(m_canvas->GetTextFont());
 552     data.SetColour(m_canvas->GetColour());
 553
 554     wxFontDialog dialog(this, data);
 555     if ( dialog.ShowModal() == wxID_OK )
 556     {
 557         wxFontData retData = dialog.GetFontData();
 558         wxFont font = retData.GetChosenFont();
 559         wxColour colour = retData.GetColour();
 560
 561         DoChangeFont(font, colour);
 562
 563         // update the state of the bold/italic/underlined menu items
 564         wxMenuBar *mbar = GetMenuBar();
 565         if ( mbar )
 566         {
 567             mbar->Check(Font_Bold, font.GetWeight() == wxFONTWEIGHT_BOLD);
 568             mbar->Check(Font_Italic, font.GetStyle() == wxFONTSTYLE_ITALIC);
 569             mbar->Check(Font_Underlined, font.GetUnderlined());
 570         }
 571     }
 572 }
 573
 574 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 575 {
 576     // true is to force the frame to close
 577     Close(true);
 578 }
 579
 580 void MyFrame::OnViewMsg(wxCommandEvent& WXUNUSED(event))
 581 {
 582     // first, choose the file
 583     static wxString s_dir, s_file;
 584     wxFileDialog dialog(this, wxT("Open an email message file"),
 585                         s_dir, s_file);
 586     if ( dialog.ShowModal() != wxID_OK )
 587         return;
 588
 589     // save for the next time
 590     s_dir = dialog.GetDirectory();
 591     s_file = dialog.GetFilename();
 592
 593     wxString filename = dialog.GetPath();
 594
 595     // load it and search for Content-Type header
 596     wxTextFile file(filename);
 597     if ( !file.Open() )
 598         return;
 599
 600     wxString charset;
 601
 602     static const wxChar *prefix = wxT("Content-Type: text/plain; charset=");
 603     const size_t len = wxStrlen(prefix);
 604
 605     size_t n, count = file.GetLineCount();
 606     for ( n = 0; n < count; n++ )
 607     {
 608         wxString line = file[n];
 609
 610         if ( !line )
 611         {
 612             // if it is an email message, headers are over, no need to parse
 613             // all the file
 614             break;
 615         }
 616
 617         if ( line.Left(len) == prefix )
 618         {
 619             // found!
 620             const wxChar *pc = line.c_str() + len;
 621             if ( *pc == wxT('"') )
 622                 pc++;
 623
 624             while ( *pc && *pc != wxT('"') )
 625             {
 626                 charset += *pc++;
 627             }
 628
 629             break;
 630         }
 631     }
 632
 633     if ( !charset )
 634     {
 635         wxLogError(wxT("The file '%s' doesn't contain charset information."),
 636                    filename.c_str());
 637
 638         return;
 639     }
 640
 641     // ok, now get the corresponding encoding
 642     wxFontEncoding fontenc = wxFontMapper::Get()->CharsetToEncoding(charset);
 643     if ( fontenc == wxFONTENCODING_SYSTEM )
 644     {
 645         wxLogError(wxT("Charset '%s' is unsupported."), charset.c_str());
 646         return;
 647     }
 648
 649     m_textctrl->LoadFile(filename);
 650
 651     if ( fontenc == wxFONTENCODING_UTF8 ||
 652             !wxFontMapper::Get()->IsEncodingAvailable(fontenc) )
 653     {
 654         // try to find some similar encoding:
 655         wxFontEncoding encAlt;
 656         if ( wxFontMapper::Get()->GetAltForEncoding(fontenc, &encAlt) )
 657         {
 658             wxEncodingConverter conv;
 659
 660             if (conv.Init(fontenc, encAlt))
 661             {
 662                 fontenc = encAlt;
 663                 m_textctrl -> SetValue(conv.Convert(m_textctrl -> GetValue()));
 664             }
 665             else
 666             {
 667                 wxLogWarning(wxT("Cannot convert from '%s' to '%s'."),
 668                              wxFontMapper::GetEncodingDescription(fontenc).c_str(),
 669                              wxFontMapper::GetEncodingDescription(encAlt).c_str());
 670             }
 671         }
 672         else
 673             wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
 674                          wxFontMapper::GetEncodingDescription(fontenc).c_str());
 675     }
 676
 677     // and now create the correct font
 678     if ( !DoEnumerateFamilies(false, fontenc, true /* silent */) )
 679     {
 680         wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 681                     wxFONTWEIGHT_NORMAL, false /* !underlined */,
 682                     wxEmptyString /* facename */, fontenc);
 683         if ( font.Ok() )
 684         {
 685             DoChangeFont(font);
 686         }
 687         else
 688         {
 689             wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
 690                          wxFontMapper::GetEncodingDescription(fontenc).c_str());
 691         }
 692     }
 693 }
 694
 695 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 696 {
 697     wxMessageBox(wxT("wxWidgets font demo\n")
 698                  wxT("(c) 1999 Vadim Zeitlin"),
 699                  wxT("About Font"),
 700                  wxOK | wxICON_INFORMATION, this);
 701 }
 702
 703 // ----------------------------------------------------------------------------
 704 // MyCanvas
 705 // ----------------------------------------------------------------------------
 706
 707 BEGIN_EVENT_TABLE(MyCanvas, wxWindow)
 708     EVT_PAINT(MyCanvas::OnPaint)
 709 END_EVENT_TABLE()
 710
 711 MyCanvas::MyCanvas( wxWindow *parent )
 712         : wxWindow( parent, wxID_ANY ),
 713           m_colour(*wxRED), m_font(*wxNORMAL_FONT)
 714 {
 715 }
 716
 717 MyCanvas::~MyCanvas()
 718 {
 719 }
 720
 721 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 722 {
 723     wxPaintDC dc(this);
 724     PrepareDC(dc);
 725
 726     // set background
 727     dc.SetBackground(wxBrush(wxT("white"), wxSOLID));
 728     dc.Clear();
 729
 730     // one text line height
 731     wxCoord hLine = dc.GetCharHeight();
 732
 733     // the current text origin
 734     wxCoord x = 5,
 735             y = 5;
 736
 737     // output the font name/info
 738     wxString fontInfo;
 739     fontInfo.Printf(wxT("Font size is %d points, family: %s, encoding: %s"),
 740                     m_font.GetPointSize(),
 741                     m_font.GetFamilyString().c_str(),
 742                     wxFontMapper::Get()->
 743                         GetEncodingDescription(m_font.GetEncoding()).c_str());
 744
 745     dc.DrawText(fontInfo, x, y);
 746     y += hLine;
 747
 748     fontInfo.Printf(wxT("Style: %s, weight: %s, fixed width: %s"),
 749                     m_font.GetStyleString().c_str(),
 750                     m_font.GetWeightString().c_str(),
 751                     m_font.IsFixedWidth() ? _T("yes") : _T("no"));
 752
 753     dc.DrawText(fontInfo, x, y);
 754     y += hLine;
 755
 756     if ( m_font.Ok() )
 757     {
 758         const wxNativeFontInfo *info = m_font.GetNativeFontInfo();
 759         if ( info )
 760         {
 761             wxString fontDesc = m_font.GetNativeFontInfoUserDesc();
 762             fontInfo.Printf(wxT("Native font info: %s"), fontDesc.c_str());
 763
 764             dc.DrawText(fontInfo, x, y);
 765             y += hLine;
 766         }
 767     }
 768
 769     y += hLine;
 770
 771     // prepare to draw the font
 772     dc.SetFont(m_font);
 773     dc.SetTextForeground(m_colour);
 774
 775     // the size of one cell (Normally biggest char + small margin)
 776     long maxCharWidth, maxCharHeight;
 777     dc.GetTextExtent(wxT("W"), &maxCharWidth, &maxCharHeight);
 778     int w = maxCharWidth + 5,
 779         h = maxCharHeight + 4;
 780
 781
 782     // print all font symbols from 32 to 256 in 7 rows of 32 chars each
 783     for ( int i = 0; i < 7; i++ )
 784     {
 785         for ( int j = 0; j < 32; j++ )
 786         {
 787             wxChar c = 32 * (i + 1) + j;
 788
 789             long charWidth, charHeight;
 790             dc.GetTextExtent(c, &charWidth, &charHeight);
 791             dc.DrawText
 792             (
 793                 c,
 794                 x + w*j + (maxCharWidth - charWidth) / 2 + 1,
 795                 y + h*i + (maxCharHeight - charHeight) / 2
 796             );
 797         }
 798     }
 799
 800     // draw the lines between them
 801     dc.SetPen(wxPen(wxColour(_T("blue")), 1, wxSOLID));
 802     int l;
 803
 804     // horizontal
 805     for ( l = 0; l < 8; l++ )
 806     {
 807         int yl = y + h*l - 2;
 808         dc.DrawLine(x - 2, yl, x + 32*w - 1, yl);
 809     }
 810
 811     // and vertical
 812     for ( l = 0; l < 33; l++ )
 813     {
 814         int xl = x + w*l - 2;
 815         dc.DrawLine(xl, y - 2, xl, y + 7*h - 1);
 816     }
 817 }