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