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 #include "../sample.xpm"
  36
  37 #ifdef __WXMAC__
  38 #undef wxFontDialog
  39 #include "wx/mac/fontdlg.h"
  40 #endif
  41
  42 // ----------------------------------------------------------------------------
  43 // private classes
  44 // ----------------------------------------------------------------------------
  45
  46 // Define a new application type, each program should derive a class from wxApp
  47 class MyApp : public wxApp
  48 {
  49 public:
  50     // override base class virtuals
  51     // ----------------------------
  52
  53     // this one is called on application startup and is a good place for the app
  54     // initialization (doing it here and not in the ctor allows to have an error
  55     // return: if OnInit() returns false, the application terminates)
  56     virtual bool OnInit();
  57 };
  58
  59 // MyCanvas is a canvas on which we show the font sample
  60 class MyCanvas: public wxWindow
  61 {
  62 public:
  63     MyCanvas( wxWindow *parent );
  64     virtual ~MyCanvas(){};
  65
  66     // accessors for the frame
  67     const wxFont& GetTextFont() const { return m_font; }
  68     const wxColour& GetColour() const { return m_colour; }
  69     void SetTextFont(const wxFont& font) { m_font = font; }
  70     void SetColour(const wxColour& colour) { m_colour = colour; }
  71
  72     // event handlers
  73     void OnPaint( wxPaintEvent &event );
  74
  75 private:
  76     wxColour m_colour;
  77     wxFont   m_font;
  78
  79     DECLARE_EVENT_TABLE()
  80 };
  81
  82 // Define a new frame type: this is going to be our main frame
  83 class MyFrame : public wxFrame
  84 {
  85 public:
  86     // ctor(s)
  87     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  88
  89     // accessors
  90     MyCanvas *GetCanvas() const { return m_canvas; }
  91
  92     // event handlers (these functions should _not_ be virtual)
  93     void OnQuit(wxCommandEvent& event);
  94     void OnAbout(wxCommandEvent& event);
  95
  96     void OnIncFont(wxCommandEvent& WXUNUSED(event)) { DoResizeFont(+2); }
  97     void OnDecFont(wxCommandEvent& WXUNUSED(event)) { DoResizeFont(-2); }
  98
  99     void OnBold(wxCommandEvent& event);
 100     void OnItalic(wxCommandEvent& event);
 101     void OnUnderline(wxCommandEvent& event);
 102
 103     void OnwxPointerFont(wxCommandEvent& event);
 104
 105     void OnViewMsg(wxCommandEvent& event);
 106     void OnSelectFont(wxCommandEvent& event);
 107     void OnEnumerateFamiliesForEncoding(wxCommandEvent& event);
 108     void OnEnumerateFamilies(wxCommandEvent& WXUNUSED(event))
 109         { DoEnumerateFamilies(false); }
 110     void OnEnumerateFixedFamilies(wxCommandEvent& WXUNUSED(event))
 111         { DoEnumerateFamilies(true); }
 112     void OnEnumerateEncodings(wxCommandEvent& event);
 113
 114     void OnCheckNativeToFromString(wxCommandEvent& event);
 115
 116 protected:
 117     bool DoEnumerateFamilies(bool fixedWidthOnly,
 118                              wxFontEncoding encoding = wxFONTENCODING_SYSTEM,
 119                              bool silent = false);
 120
 121     void DoResizeFont(int diff);
 122     void DoChangeFont(const wxFont& font, const wxColour& col = wxNullColour);
 123
 124     size_t      m_fontSize; // in points
 125
 126     wxTextCtrl *m_textctrl;
 127     MyCanvas   *m_canvas;
 128
 129 private:
 130     // any class wishing to process wxWidgets events must use this macro
 131     DECLARE_EVENT_TABLE()
 132 };
 133
 134 // ----------------------------------------------------------------------------
 135 // constants
 136 // ----------------------------------------------------------------------------
 137
 138 // IDs for the controls and the menu commands
 139 enum
 140 {
 141     // menu items
 142     Font_Quit = 1,
 143     Font_About,
 144     Font_ViewMsg,
 145     Font_IncSize,
 146     Font_DecSize,
 147     Font_Bold,
 148     Font_Italic,
 149     Font_Underlined,
 150     Font_wxNORMAL_FONT,
 151     Font_wxSMALL_FONT,
 152     Font_wxITALIC_FONT,
 153     Font_wxSWISS_FONT,
 154     Font_Standard,
 155
 156     Font_Choose = 100,
 157     Font_EnumFamiliesForEncoding,
 158     Font_EnumFamilies,
 159     Font_EnumFixedFamilies,
 160     Font_EnumEncodings,
 161     Font_CheckNativeToFromString,
 162     Font_Max
 163 };
 164
 165 // ----------------------------------------------------------------------------
 166 // event tables and other macros for wxWidgets
 167 // ----------------------------------------------------------------------------
 168
 169 // the event tables connect the wxWidgets events with the functions (event
 170 // handlers) which process them. It can be also done at run-time, but for the
 171 // simple menu events like this the static method is much simpler.
 172 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 173     EVT_MENU(Font_Quit,  MyFrame::OnQuit)
 174     EVT_MENU(Font_ViewMsg, MyFrame::OnViewMsg)
 175     EVT_MENU(Font_About, MyFrame::OnAbout)
 176
 177     EVT_MENU(Font_IncSize, MyFrame::OnIncFont)
 178     EVT_MENU(Font_DecSize, MyFrame::OnDecFont)
 179     EVT_MENU(Font_Bold, MyFrame::OnBold)
 180     EVT_MENU(Font_Italic, MyFrame::OnItalic)
 181     EVT_MENU(Font_Underlined, MyFrame::OnUnderline)
 182
 183     EVT_MENU(Font_wxNORMAL_FONT, MyFrame::OnwxPointerFont)
 184     EVT_MENU(Font_wxSMALL_FONT, MyFrame::OnwxPointerFont)
 185     EVT_MENU(Font_wxITALIC_FONT, MyFrame::OnwxPointerFont)
 186     EVT_MENU(Font_wxSWISS_FONT, MyFrame::OnwxPointerFont)
 187
 188     EVT_MENU(Font_CheckNativeToFromString, MyFrame::OnCheckNativeToFromString)
 189
 190     EVT_MENU(Font_Choose, MyFrame::OnSelectFont)
 191     EVT_MENU(Font_EnumFamiliesForEncoding, MyFrame::OnEnumerateFamiliesForEncoding)
 192     EVT_MENU(Font_EnumFamilies, MyFrame::OnEnumerateFamilies)
 193     EVT_MENU(Font_EnumFixedFamilies, MyFrame::OnEnumerateFixedFamilies)
 194     EVT_MENU(Font_EnumEncodings, MyFrame::OnEnumerateEncodings)
 195 END_EVENT_TABLE()
 196
 197 // Create a new application object: this macro will allow wxWidgets to create
 198 // the application object during program execution (it's better than using a
 199 // static object for many reasons) and also declares the accessor function
 200 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 201 // not wxApp)
 202 IMPLEMENT_APP(MyApp)
 203
 204 // ============================================================================
 205 // implementation
 206 // ============================================================================
 207
 208 // ----------------------------------------------------------------------------
 209 // the application class
 210 // ----------------------------------------------------------------------------
 211
 212 // `Main program' equivalent: the program execution "starts" here
 213 bool MyApp::OnInit()
 214 {
 215     // Create the main application window
 216     MyFrame *frame = new MyFrame(wxT("Font wxWidgets demo"),
 217                                  wxPoint(50, 50), wxSize(600, 400));
 218
 219     // Show it and tell the application that it's our main window
 220     frame->Show(true);
 221     SetTopWindow(frame);
 222
 223     // success: wxApp::OnRun() will be called which will enter the main message
 224     // loop and the application will run. If we returned 'false' here, the
 225     // application would exit immediately.
 226     return true;
 227 }
 228
 229 // ----------------------------------------------------------------------------
 230 // main frame
 231 // ----------------------------------------------------------------------------
 232
 233 // frame constructor
 234 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 235        : wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size), m_textctrl(NULL)
 236 {
 237     m_fontSize = 12;
 238
 239     SetIcon(wxIcon(sample_xpm));
 240
 241     // create a menu bar
 242     wxMenu *menuFile = new wxMenu;
 243
 244     menuFile->Append(Font_ViewMsg, wxT("&View...\tCtrl-V"),
 245                      wxT("View an email message file"));
 246     menuFile->AppendSeparator();
 247     menuFile->Append(Font_About, wxT("&About...\tCtrl-A"), wxT("Show about dialog"));
 248     menuFile->AppendSeparator();
 249     menuFile->Append(Font_Quit, wxT("E&xit\tAlt-X"), wxT("Quit this program"));
 250
 251     wxMenu *menuFont = new wxMenu;
 252     menuFont->Append(Font_IncSize, wxT("&Increase font size by 2 points\tCtrl-I"));
 253     menuFont->Append(Font_DecSize, wxT("&Decrease font size by 2 points\tCtrl-D"));
 254     menuFont->AppendSeparator();
 255     menuFont->AppendCheckItem(Font_Bold, wxT("&Bold\tCtrl-B"), wxT("Toggle bold state"));
 256     menuFont->AppendCheckItem(Font_Italic, wxT("&Oblique\tCtrl-O"), wxT("Toggle italic state"));
 257     menuFont->AppendCheckItem(Font_Underlined, wxT("&Underlined\tCtrl-U"),
 258                      wxT("Toggle underlined state"));
 259
 260     menuFont->AppendSeparator();
 261     menuFont->Append(Font_CheckNativeToFromString,
 262                      wxT("Check Native Font Info To/From String"));
 263
 264     wxMenu *menuSelect = new wxMenu;
 265     menuSelect->Append(Font_Choose, wxT("&Select font...\tCtrl-S"),
 266                      wxT("Select a standard font"));
 267
 268     wxMenu *menuStdFonts = new wxMenu;
 269     menuStdFonts->Append(Font_wxNORMAL_FONT, wxT("wxNORMAL_FONT"), wxT("Normal font used by wxWidgets"));
 270     menuStdFonts->Append(Font_wxSMALL_FONT,  wxT("wxSMALL_FONT"),  wxT("Small font used by wxWidgets"));
 271     menuStdFonts->Append(Font_wxITALIC_FONT, wxT("wxITALIC_FONT"), wxT("Italic font used by wxWidgets"));
 272     menuStdFonts->Append(Font_wxSWISS_FONT,  wxT("wxSWISS_FONT"),  wxT("Swiss font used by wxWidgets"));
 273     menuSelect->Append(Font_Standard, wxT("Standar&d fonts"), menuStdFonts);
 274
 275     menuSelect->AppendSeparator();
 276     menuSelect->Append(Font_EnumFamilies, wxT("Enumerate font &families\tCtrl-F"));
 277     menuSelect->Append(Font_EnumFixedFamilies,
 278                      wxT("Enumerate fi&xed font families\tCtrl-X"));
 279     menuSelect->Append(Font_EnumEncodings,
 280                      wxT("Enumerate &encodings\tCtrl-E"));
 281     menuSelect->Append(Font_EnumFamiliesForEncoding,
 282                      wxT("Find font for en&coding...\tCtrl-C"),
 283                      wxT("Find font families for given encoding"));
 284
 285     // now append the freshly created menu to the menu bar...
 286     wxMenuBar *menuBar = new wxMenuBar;
 287     menuBar->Append(menuFile, wxT("&File"));
 288     menuBar->Append(menuFont, wxT("F&ont"));
 289     menuBar->Append(menuSelect, wxT("&Select"));
 290
 291     // ... and attach this menu bar to the frame
 292     SetMenuBar(menuBar);
 293
 294     wxSplitterWindow *splitter = new wxSplitterWindow(this);
 295
 296     m_textctrl = new wxTextCtrl(splitter, wxID_ANY,
 297                                 wxT("Paste text here to see how it looks\nlike in the given font"),
 298                                 wxDefaultPosition, wxDefaultSize,
 299                                 wxTE_MULTILINE);
 300
 301     m_canvas = new MyCanvas(splitter);
 302
 303     splitter->SplitHorizontally(m_textctrl, m_canvas, 100);
 304
 305 #if wxUSE_STATUSBAR
 306     // create a status bar just for fun (by default with 1 pane only)
 307     CreateStatusBar();
 308     SetStatusText(wxT("Welcome to wxWidgets font demo!"));
 309 #endif // wxUSE_STATUSBAR
 310 }
 311
 312 // --------------------------------------------------------
 313
 314 class MyEncodingEnumerator : public wxFontEnumerator
 315 {
 316 public:
 317     MyEncodingEnumerator()
 318         { m_n = 0; }
 319
 320     const wxString& GetText() const
 321         { return m_text; }
 322
 323 protected:
 324     virtual bool OnFontEncoding(const wxString& facename,
 325                                 const wxString& encoding)
 326     {
 327         wxString text;
 328         text.Printf(wxT("Encoding %u: %s (available in facename '%s')\n"),
 329                     (unsigned int) ++m_n, encoding.c_str(), facename.c_str());
 330         m_text += text;
 331         return true;
 332     }
 333
 334 private:
 335     size_t m_n;
 336     wxString m_text;
 337 };
 338
 339 void MyFrame::OnEnumerateEncodings(wxCommandEvent& WXUNUSED(event))
 340 {
 341     MyEncodingEnumerator fontEnumerator;
 342
 343     fontEnumerator.EnumerateEncodings();
 344
 345     wxLogMessage(wxT("Enumerating all available encodings:\n%s"),
 346                  fontEnumerator.GetText().c_str());
 347 }
 348
 349 // -------------------------------------------------------------
 350
 351 class MyFontEnumerator : public wxFontEnumerator
 352 {
 353 public:
 354     bool GotAny() const
 355         { return !m_facenames.IsEmpty(); }
 356
 357     const wxArrayString& GetFacenames() const
 358         { return m_facenames; }
 359
 360 protected:
 361     virtual bool OnFacename(const wxString& facename)
 362     {
 363         m_facenames.Add(facename);
 364         return true;
 365     }
 366
 367     private:
 368         wxArrayString m_facenames;
 369 } fontEnumerator;
 370
 371 bool MyFrame::DoEnumerateFamilies(bool fixedWidthOnly,
 372                                   wxFontEncoding encoding,
 373                                   bool silent)
 374 {
 375     MyFontEnumerator fontEnumerator;
 376
 377     fontEnumerator.EnumerateFacenames(encoding, fixedWidthOnly);
 378
 379     if ( fontEnumerator.GotAny() )
 380     {
 381         int nFacenames = fontEnumerator.GetFacenames().GetCount();
 382         if ( !silent )
 383         {
 384             wxLogStatus(this, wxT("Found %d %sfonts"),
 385                         nFacenames, fixedWidthOnly ? wxT("fixed width ") : wxT(""));
 386         }
 387
 388         wxString facename;
 389
 390         if ( silent )
 391         {
 392             // choose the first
 393             facename = fontEnumerator.GetFacenames().Item(0);
 394         }
 395         else
 396         {
 397             // let the user choose
 398             wxString *facenames = new wxString[nFacenames];
 399             int n;
 400             for ( n = 0; n < nFacenames; n++ )
 401                 facenames[n] = fontEnumerator.GetFacenames().Item(n);
 402
 403             n = wxGetSingleChoiceIndex(wxT("Choose a facename"), wxT("Font demo"),
 404                                        nFacenames, facenames, this);
 405
 406             if ( n != -1 )
 407                 facename = facenames[n];
 408
 409             delete [] facenames;
 410         }
 411
 412         if ( !facename.empty() )
 413         {
 414             wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 415                         wxFONTWEIGHT_NORMAL, false, facename, encoding);
 416
 417             DoChangeFont(font);
 418         }
 419
 420         return true;
 421     }
 422     else if ( !silent )
 423     {
 424         wxLogWarning(wxT("No such fonts found."));
 425     }
 426
 427     return false;
 428 }
 429
 430 void MyFrame::OnEnumerateFamiliesForEncoding(wxCommandEvent& WXUNUSED(event))
 431 {
 432     static wxFontEncoding encodings[] =
 433     {
 434         wxFONTENCODING_ISO8859_1,
 435         wxFONTENCODING_ISO8859_2,
 436         wxFONTENCODING_ISO8859_5,
 437         wxFONTENCODING_ISO8859_7,
 438         wxFONTENCODING_ISO8859_15,
 439         wxFONTENCODING_KOI8,
 440         wxFONTENCODING_KOI8_U,
 441         wxFONTENCODING_CP1250,
 442         wxFONTENCODING_CP1251,
 443         wxFONTENCODING_CP1252,
 444     };
 445
 446     static const wxString encodingNames[] =
 447     {
 448         wxT("Western European (ISO-8859-1)"),
 449         wxT("Central European (ISO-8859-2)"),
 450         wxT("Cyrillic (ISO-8859-5)"),
 451         wxT("Greek (ISO-8859-7)"),
 452         wxT("Western European with Euro (ISO-8859-15)"),
 453         wxT("KOI8-R"),
 454         wxT("KOI8-U"),
 455         wxT("Windows Central European (CP 1250)"),
 456         wxT("Windows Cyrillic (CP 1251)"),
 457         wxT("Windows Western European (CP 1252)"),
 458     };
 459
 460     int n = wxGetSingleChoiceIndex(wxT("Choose an encoding"), wxT("Font demo"),
 461                                    WXSIZEOF(encodingNames),
 462                                    encodingNames,
 463                                    this);
 464
 465     if ( n != -1 )
 466     {
 467         DoEnumerateFamilies(false, encodings[n]);
 468     }
 469 }
 470
 471 void MyFrame::OnCheckNativeToFromString(wxCommandEvent& WXUNUSED(event))
 472 {
 473     wxString fontInfo = m_canvas->GetTextFont().GetNativeFontInfoDesc();
 474
 475     if ( fontInfo.empty() )
 476     {
 477         wxLogError(wxT("Native font info string is empty!"));
 478     }
 479     else
 480     {
 481         wxFont *font = wxFont::New(fontInfo);
 482         if ( fontInfo != font->GetNativeFontInfoDesc() )
 483             wxLogError(wxT("wxNativeFontInfo ToString()/FromString() broken!"));
 484         else
 485             wxLogMessage(wxT("wxNativeFontInfo works: %s"), fontInfo.c_str());
 486
 487         delete font;
 488      }
 489 }
 490
 491 void MyFrame::DoResizeFont(int diff)
 492 {
 493     wxFont font = m_canvas->GetTextFont();
 494
 495     font.SetPointSize(font.GetPointSize() + diff);
 496     DoChangeFont(font);
 497 }
 498
 499 void MyFrame::OnBold(wxCommandEvent& event)
 500 {
 501     wxFont font = m_canvas->GetTextFont();
 502
 503     font.SetWeight(event.IsChecked() ? wxFONTWEIGHT_BOLD : wxFONTWEIGHT_NORMAL);
 504     DoChangeFont(font);
 505 }
 506
 507 void MyFrame::OnItalic(wxCommandEvent& event)
 508 {
 509     wxFont font = m_canvas->GetTextFont();
 510
 511     font.SetStyle(event.IsChecked() ? wxFONTSTYLE_ITALIC : wxFONTSTYLE_NORMAL);
 512     DoChangeFont(font);
 513 }
 514
 515 void MyFrame::OnUnderline(wxCommandEvent& event)
 516 {
 517     wxFont font = m_canvas->GetTextFont();
 518
 519     font.SetUnderlined(event.IsChecked());
 520     DoChangeFont(font);
 521 }
 522
 523 void MyFrame::OnwxPointerFont(wxCommandEvent& event)
 524 {
 525     wxFont font;
 526
 527     switch (event.GetId())
 528     {
 529         case Font_wxNORMAL_FONT : font = wxFont(*wxNORMAL_FONT); break;
 530         case Font_wxSMALL_FONT  : font = wxFont(*wxSMALL_FONT); break;
 531         case Font_wxITALIC_FONT : font = wxFont(*wxITALIC_FONT); break;
 532         case Font_wxSWISS_FONT  : font = wxFont(*wxSWISS_FONT); break;
 533         default                 : font = wxFont(*wxNORMAL_FONT); break;
 534     }
 535
 536     GetMenuBar()->Check(Font_Bold, false);
 537     GetMenuBar()->Check(Font_Italic, false);
 538     GetMenuBar()->Check(Font_Underlined, false);
 539
 540     DoChangeFont(font);
 541 }
 542
 543 void MyFrame::DoChangeFont(const wxFont& font, const wxColour& col)
 544 {
 545     m_canvas->SetTextFont(font);
 546     if ( col.Ok() )
 547         m_canvas->SetColour(col);
 548     m_canvas->Refresh();
 549
 550     m_textctrl->SetFont(font);
 551     if ( col.Ok() )
 552         m_textctrl->SetForegroundColour(col);
 553 }
 554
 555 void MyFrame::OnSelectFont(wxCommandEvent& WXUNUSED(event))
 556 {
 557     wxFontData data;
 558     data.SetInitialFont(m_canvas->GetTextFont());
 559     data.SetColour(m_canvas->GetColour());
 560
 561     wxFontDialog dialog(this, data);
 562     if ( dialog.ShowModal() == wxID_OK )
 563     {
 564         wxFontData retData = dialog.GetFontData();
 565         wxFont font = retData.GetChosenFont();
 566         wxColour colour = retData.GetColour();
 567
 568         DoChangeFont(font, colour);
 569
 570         // update the state of the bold/italic/underlined menu items
 571         wxMenuBar *mbar = GetMenuBar();
 572         if ( mbar )
 573         {
 574             mbar->Check(Font_Bold, font.GetWeight() == wxFONTWEIGHT_BOLD);
 575             mbar->Check(Font_Italic, font.GetStyle() == wxFONTSTYLE_ITALIC);
 576             mbar->Check(Font_Underlined, font.GetUnderlined());
 577         }
 578     }
 579 }
 580
 581 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 582 {
 583     // true is to force the frame to close
 584     Close(true);
 585 }
 586
 587 void MyFrame::OnViewMsg(wxCommandEvent& WXUNUSED(event))
 588 {
 589 #if wxUSE_FILEDLG
 590     // first, choose the file
 591     static wxString s_dir, s_file;
 592     wxFileDialog dialog(this, wxT("Open an email message file"),
 593                         s_dir, s_file);
 594     if ( dialog.ShowModal() != wxID_OK )
 595         return;
 596
 597     // save for the next time
 598     s_dir = dialog.GetDirectory();
 599     s_file = dialog.GetFilename();
 600
 601     wxString filename = dialog.GetPath();
 602
 603     // load it and search for Content-Type header
 604     wxTextFile file(filename);
 605     if ( !file.Open() )
 606         return;
 607
 608     wxString charset;
 609
 610     static const wxChar *prefix = wxT("Content-Type: text/plain; charset=");
 611     const size_t len = wxStrlen(prefix);
 612
 613     size_t n, count = file.GetLineCount();
 614     for ( n = 0; n < count; n++ )
 615     {
 616         wxString line = file[n];
 617
 618         if ( !line )
 619         {
 620             // if it is an email message, headers are over, no need to parse
 621             // all the file
 622             break;
 623         }
 624
 625         if ( line.Left(len) == prefix )
 626         {
 627             // found!
 628             const wxChar *pc = line.c_str() + len;
 629             if ( *pc == wxT('"') )
 630                 pc++;
 631
 632             while ( *pc && *pc != wxT('"') )
 633             {
 634                 charset += *pc++;
 635             }
 636
 637             break;
 638         }
 639     }
 640
 641     if ( !charset )
 642     {
 643         wxLogError(wxT("The file '%s' doesn't contain charset information."),
 644                    filename.c_str());
 645
 646         return;
 647     }
 648
 649     // ok, now get the corresponding encoding
 650     wxFontEncoding fontenc = wxFontMapper::Get()->CharsetToEncoding(charset);
 651     if ( fontenc == wxFONTENCODING_SYSTEM )
 652     {
 653         wxLogError(wxT("Charset '%s' is unsupported."), charset.c_str());
 654         return;
 655     }
 656
 657     m_textctrl->LoadFile(filename);
 658
 659     if ( fontenc == wxFONTENCODING_UTF8 ||
 660             !wxFontMapper::Get()->IsEncodingAvailable(fontenc) )
 661     {
 662         // try to find some similar encoding:
 663         wxFontEncoding encAlt;
 664         if ( wxFontMapper::Get()->GetAltForEncoding(fontenc, &encAlt) )
 665         {
 666             wxEncodingConverter conv;
 667
 668             if (conv.Init(fontenc, encAlt))
 669             {
 670                 fontenc = encAlt;
 671                 m_textctrl -> SetValue(conv.Convert(m_textctrl -> GetValue()));
 672             }
 673             else
 674             {
 675                 wxLogWarning(wxT("Cannot convert from '%s' to '%s'."),
 676                              wxFontMapper::GetEncodingDescription(fontenc).c_str(),
 677                              wxFontMapper::GetEncodingDescription(encAlt).c_str());
 678             }
 679         }
 680         else
 681             wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
 682                          wxFontMapper::GetEncodingDescription(fontenc).c_str());
 683     }
 684
 685     // and now create the correct font
 686     if ( !DoEnumerateFamilies(false, fontenc, true /* silent */) )
 687     {
 688         wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 689                     wxFONTWEIGHT_NORMAL, false /* !underlined */,
 690                     wxEmptyString /* facename */, fontenc);
 691         if ( font.Ok() )
 692         {
 693             DoChangeFont(font);
 694         }
 695         else
 696         {
 697             wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
 698                          wxFontMapper::GetEncodingDescription(fontenc).c_str());
 699         }
 700     }
 701 #endif // wxUSE_FILEDLG
 702 }
 703
 704 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 705 {
 706     wxMessageBox(wxT("wxWidgets font demo\n")
 707                  wxT("(c) 1999 Vadim Zeitlin"),
 708                  wxT("About Font"),
 709                  wxOK | wxICON_INFORMATION, this);
 710 }
 711
 712 // ----------------------------------------------------------------------------
 713 // MyCanvas
 714 // ----------------------------------------------------------------------------
 715
 716 BEGIN_EVENT_TABLE(MyCanvas, wxWindow)
 717     EVT_PAINT(MyCanvas::OnPaint)
 718 END_EVENT_TABLE()
 719
 720 MyCanvas::MyCanvas( wxWindow *parent )
 721         : wxWindow( parent, wxID_ANY ),
 722           m_colour(*wxRED), m_font(*wxNORMAL_FONT)
 723 {
 724 }
 725
 726 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 727 {
 728     wxPaintDC dc(this);
 729     PrepareDC(dc);
 730
 731     // set background
 732     dc.SetBackground(wxBrush(wxT("white"), wxSOLID));
 733     dc.Clear();
 734
 735     // one text line height
 736     wxCoord hLine = dc.GetCharHeight();
 737
 738     // the current text origin
 739     wxCoord x = 5,
 740             y = 5;
 741
 742     // output the font name/info
 743     wxString fontInfo;
 744     fontInfo.Printf(wxT("Font size is %d points, family: %s, encoding: %s"),
 745                     m_font.GetPointSize(),
 746                     m_font.GetFamilyString().c_str(),
 747                     wxFontMapper::
 748                         GetEncodingDescription(m_font.GetEncoding()).c_str());
 749
 750     dc.DrawText(fontInfo, x, y);
 751     y += hLine;
 752
 753     fontInfo.Printf(wxT("Style: %s, weight: %s, fixed width: %s"),
 754                     m_font.GetStyleString().c_str(),
 755                     m_font.GetWeightString().c_str(),
 756                     m_font.IsFixedWidth() ? _T("yes") : _T("no"));
 757
 758     dc.DrawText(fontInfo, x, y);
 759     y += hLine;
 760
 761     if ( m_font.Ok() )
 762     {
 763         const wxNativeFontInfo *info = m_font.GetNativeFontInfo();
 764         if ( info )
 765         {
 766             wxString fontDesc = m_font.GetNativeFontInfoUserDesc();
 767             fontInfo.Printf(wxT("Native font info: %s"), fontDesc.c_str());
 768
 769             dc.DrawText(fontInfo, x, y);
 770             y += hLine;
 771         }
 772     }
 773
 774     y += hLine;
 775
 776     // prepare to draw the font
 777     dc.SetFont(m_font);
 778     dc.SetTextForeground(m_colour);
 779
 780     // the size of one cell (Normally biggest char + small margin)
 781     long maxCharWidth, maxCharHeight;
 782     dc.GetTextExtent(wxT("W"), &maxCharWidth, &maxCharHeight);
 783     int w = maxCharWidth + 5,
 784         h = maxCharHeight + 4;
 785
 786
 787     // print all font symbols from 32 to 256 in 7 rows of 32 chars each
 788     for ( int i = 0; i < 7; i++ )
 789     {
 790         for ( int j = 0; j < 32; j++ )
 791         {
 792             wxChar c = (wxChar)(32 * (i + 1) + j);
 793
 794             long charWidth, charHeight;
 795             dc.GetTextExtent(c, &charWidth, &charHeight);
 796             dc.DrawText
 797             (
 798                 c,
 799                 x + w*j + (maxCharWidth - charWidth) / 2 + 1,
 800                 y + h*i + (maxCharHeight - charHeight) / 2
 801             );
 802         }
 803     }
 804
 805     // draw the lines between them
 806     dc.SetPen(wxPen(wxColour(_T("blue")), 1, wxSOLID));
 807     int l;
 808
 809     // horizontal
 810     for ( l = 0; l < 8; l++ )
 811     {
 812         int yl = y + h*l - 2;
 813         dc.DrawLine(x - 2, yl, x + 32*w - 1, yl);
 814     }
 815
 816     // and vertical
 817     for ( l = 0; l < 33; l++ )
 818     {
 819         int xl = x + w*l - 2;
 820         dc.DrawLine(xl, y - 2, xl, y + 7*h - 1);
 821     }
 822 }