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 // ----------------------------------------------------------------------------
  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& WXUNUSED(event)) { DoResizeFont(+2); }
  90     void OnDecFont(wxCommandEvent& WXUNUSED(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 wxWidgets 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 wxWidgets
 160 // ----------------------------------------------------------------------------
 161
 162 // the event tables connect the wxWidgets 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 wxWidgets 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 wxWidgets 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, wxID_ANY, 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->AppendCheckItem(Font_Bold, wxT("&Bold\tCtrl-B"), wxT("Toggle bold state"));
 247     menuFont->AppendCheckItem(Font_Italic, wxT("&Oblique\tCtrl-O"), wxT("Toggle italic state"));
 248     menuFont->AppendCheckItem(Font_Underlined, wxT("&Underlined\tCtrl-U"),
 249                      wxT("Toggle underlined state"));
 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 wxWidgets"));
 261     menuStdFonts->Append(Font_wxSMALL_FONT,  wxT("wxSMALL_FONT"),  wxT("Small font used by wxWidgets"));
 262     menuStdFonts->Append(Font_wxITALIC_FONT, wxT("wxITALIC_FONT"), wxT("Italic font used by wxWidgets"));
 263     menuStdFonts->Append(Font_wxSWISS_FONT,  wxT("wxSWISS_FONT"),  wxT("Swiss font used by wxWidgets"));
 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, wxID_ANY,
 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 #if wxUSE_STATUSBAR
 297     // create a status bar just for fun (by default with 1 pane only)
 298     CreateStatusBar();
 299     SetStatusText(wxT("Welcome to wxWidgets font demo!"));
 300 #endif // wxUSE_STATUSBAR
 301 }
 302
 303 // --------------------------------------------------------
 304
 305 class MyEncodingEnumerator : public wxFontEnumerator
 306 {
 307 public:
 308     MyEncodingEnumerator()
 309         { m_n = 0; }
 310
 311     const wxString& GetText() const
 312         { return m_text; }
 313
 314 protected:
 315     virtual bool OnFontEncoding(const wxString& facename,
 316                                 const wxString& encoding)
 317     {
 318         wxString text;
 319         text.Printf(wxT("Encoding %d: %s (available in facename '%s')\n"),
 320                     ++m_n, encoding.c_str(), facename.c_str());
 321         m_text += text;
 322         return true;
 323     }
 324
 325 private:
 326     size_t m_n;
 327     wxString m_text;
 328 };
 329
 330 void MyFrame::OnEnumerateEncodings(wxCommandEvent& WXUNUSED(event))
 331 {
 332     MyEncodingEnumerator fontEnumerator;
 333
 334     fontEnumerator.EnumerateEncodings();
 335
 336     wxLogMessage(wxT("Enumerating all available encodings:\n%s"),
 337                  fontEnumerator.GetText().c_str());
 338 }
 339
 340 // -------------------------------------------------------------
 341
 342 class MyFontEnumerator : public wxFontEnumerator
 343 {
 344 public:
 345     bool GotAny() const
 346         { return !m_facenames.IsEmpty(); }
 347
 348     const wxArrayString& GetFacenames() const
 349         { return m_facenames; }
 350
 351 protected:
 352     virtual bool OnFacename(const wxString& facename)
 353     {
 354         m_facenames.Add(facename);
 355         return true;
 356     }
 357
 358     private:
 359         wxArrayString m_facenames;
 360 } fontEnumerator;
 361
 362 bool MyFrame::DoEnumerateFamilies(bool fixedWidthOnly,
 363                                   wxFontEncoding encoding,
 364                                   bool silent)
 365 {
 366     MyFontEnumerator fontEnumerator;
 367
 368     fontEnumerator.EnumerateFacenames(encoding, fixedWidthOnly);
 369
 370     if ( fontEnumerator.GotAny() )
 371     {
 372         int nFacenames = fontEnumerator.GetFacenames().GetCount();
 373         if ( !silent )
 374         {
 375             wxLogStatus(this, wxT("Found %d %sfonts"),
 376                         nFacenames, fixedWidthOnly ? wxT("fixed width ") : wxT(""));
 377         }
 378
 379         wxString facename;
 380         if ( silent )
 381         {
 382             // choose the first
 383             facename = fontEnumerator.GetFacenames().Item(0);
 384         }
 385         else
 386         {
 387             // let the user choose
 388             wxString *facenames = new wxString[nFacenames];
 389             int n;
 390             for ( n = 0; n < nFacenames; n++ )
 391                 facenames[n] = fontEnumerator.GetFacenames().Item(n);
 392
 393             n = wxGetSingleChoiceIndex(wxT("Choose a facename"), wxT("Font demo"),
 394                                        nFacenames, facenames, this);
 395
 396             if ( n != -1 )
 397                 facename = facenames[n];
 398
 399             delete [] facenames;
 400         }
 401
 402         if ( !facename.IsEmpty() )
 403         {
 404             wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 405                         wxFONTWEIGHT_NORMAL, false, facename, encoding);
 406
 407             DoChangeFont(font);
 408         }
 409
 410         return true;
 411     }
 412     else if ( !silent )
 413     {
 414         wxLogWarning(wxT("No such fonts found."));
 415     }
 416
 417     return false;
 418 }
 419
 420 void MyFrame::OnEnumerateFamiliesForEncoding(wxCommandEvent& WXUNUSED(event))
 421 {
 422     static wxFontEncoding encodings[] =
 423     {
 424         wxFONTENCODING_ISO8859_1,
 425         wxFONTENCODING_ISO8859_2,
 426         wxFONTENCODING_ISO8859_5,
 427         wxFONTENCODING_ISO8859_7,
 428         wxFONTENCODING_ISO8859_15,
 429         wxFONTENCODING_KOI8,
 430         wxFONTENCODING_KOI8_U,
 431         wxFONTENCODING_CP1250,
 432         wxFONTENCODING_CP1251,
 433         wxFONTENCODING_CP1252,
 434     };
 435
 436     static const wxString encodingNames[] =
 437     {
 438         wxT("Western European (ISO-8859-1)"),
 439         wxT("Central European (ISO-8859-2)"),
 440         wxT("Cyrillic (ISO-8859-5)"),
 441         wxT("Greek (ISO-8859-7)"),
 442         wxT("Western European with Euro (ISO-8859-15)"),
 443         wxT("KOI8-R"),
 444         wxT("KOI8-U"),
 445         wxT("Windows Central European (CP 1250)"),
 446         wxT("Windows Cyrillic (CP 1251)"),
 447         wxT("Windows Western European (CP 1252)"),
 448     };
 449
 450     int n = wxGetSingleChoiceIndex(wxT("Choose an encoding"), wxT("Font demo"),
 451                                    WXSIZEOF(encodingNames),
 452                                    encodingNames,
 453                                    this);
 454
 455     if ( n != -1 )
 456     {
 457         DoEnumerateFamilies(false, encodings[n]);
 458     }
 459 }
 460
 461 void MyFrame::OnCheckNativeToFromString(wxCommandEvent& WXUNUSED(event))
 462 {
 463     wxString fontInfo = m_canvas->GetTextFont().GetNativeFontInfoDesc();
 464
 465     if ( fontInfo.IsEmpty() )
 466     {
 467         wxLogError(wxT("Native font info string is empty!"));
 468     }
 469     else
 470     {
 471         wxFont *font = wxFont::New(fontInfo);
 472         if ( fontInfo != font->GetNativeFontInfoDesc() )
 473             wxLogError(wxT("wxNativeFontInfo ToString()/FromString() broken!"));
 474         else
 475             wxLogMessage(wxT("wxNativeFontInfo works: %s"), fontInfo.c_str());
 476
 477         delete font;
 478      }
 479 }
 480
 481 void MyFrame::DoResizeFont(int diff)
 482 {
 483     wxFont font = m_canvas->GetTextFont();
 484
 485     font.SetPointSize(font.GetPointSize() + diff);
 486     DoChangeFont(font);
 487 }
 488
 489 void MyFrame::OnBold(wxCommandEvent& event)
 490 {
 491     wxFont font = m_canvas->GetTextFont();
 492
 493     font.SetWeight(event.IsChecked() ? wxFONTWEIGHT_BOLD : wxFONTWEIGHT_NORMAL);
 494     DoChangeFont(font);
 495 }
 496
 497 void MyFrame::OnItalic(wxCommandEvent& event)
 498 {
 499     wxFont font = m_canvas->GetTextFont();
 500
 501     font.SetStyle(event.IsChecked() ? wxFONTSTYLE_ITALIC : wxFONTSTYLE_NORMAL);
 502     DoChangeFont(font);
 503 }
 504
 505 void MyFrame::OnUnderline(wxCommandEvent& event)
 506 {
 507     wxFont font = m_canvas->GetTextFont();
 508
 509     font.SetUnderlined(event.IsChecked());
 510     DoChangeFont(font);
 511 }
 512
 513 void MyFrame::OnwxPointerFont(wxCommandEvent& event)
 514 {
 515     wxFont font;
 516
 517     switch (event.GetId())
 518     {
 519         case Font_wxNORMAL_FONT : font = wxFont(*wxNORMAL_FONT); break;
 520         case Font_wxSMALL_FONT  : font = wxFont(*wxSMALL_FONT); break;
 521         case Font_wxITALIC_FONT : font = wxFont(*wxITALIC_FONT); break;
 522         case Font_wxSWISS_FONT  : font = wxFont(*wxSWISS_FONT); break;
 523         default                 : font = wxFont(*wxNORMAL_FONT); break;
 524     }
 525
 526     GetMenuBar()->Check(Font_Bold, false);
 527     GetMenuBar()->Check(Font_Italic, false);
 528     GetMenuBar()->Check(Font_Underlined, false);
 529
 530     DoChangeFont(font);
 531 }
 532
 533 void MyFrame::DoChangeFont(const wxFont& font, const wxColour& col)
 534 {
 535     m_canvas->SetTextFont(font);
 536     if ( col.Ok() )
 537         m_canvas->SetColour(col);
 538     m_canvas->Refresh();
 539
 540     m_textctrl->SetFont(font);
 541     if ( col.Ok() )
 542         m_textctrl->SetForegroundColour(col);
 543 }
 544
 545 void MyFrame::OnSelectFont(wxCommandEvent& WXUNUSED(event))
 546 {
 547     wxFontData data;
 548     data.SetInitialFont(m_canvas->GetTextFont());
 549     data.SetColour(m_canvas->GetColour());
 550
 551     wxFontDialog dialog(this, data);
 552     if ( dialog.ShowModal() == wxID_OK )
 553     {
 554         wxFontData retData = dialog.GetFontData();
 555         wxFont font = retData.GetChosenFont();
 556         wxColour colour = retData.GetColour();
 557
 558         DoChangeFont(font, colour);
 559
 560         // update the state of the bold/italic/underlined menu items
 561         wxMenuBar *mbar = GetMenuBar();
 562         if ( mbar )
 563         {
 564             mbar->Check(Font_Bold, font.GetWeight() == wxFONTWEIGHT_BOLD);
 565             mbar->Check(Font_Italic, font.GetStyle() == wxFONTSTYLE_ITALIC);
 566             mbar->Check(Font_Underlined, font.GetUnderlined());
 567         }
 568     }
 569 }
 570
 571 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 572 {
 573     // true is to force the frame to close
 574     Close(true);
 575 }
 576
 577 void MyFrame::OnViewMsg(wxCommandEvent& WXUNUSED(event))
 578 {
 579     // first, choose the file
 580     static wxString s_dir, s_file;
 581     wxFileDialog dialog(this, wxT("Open an email message file"),
 582                         s_dir, s_file);
 583     if ( dialog.ShowModal() != wxID_OK )
 584         return;
 585
 586     // save for the next time
 587     s_dir = dialog.GetDirectory();
 588     s_file = dialog.GetFilename();
 589
 590     wxString filename = dialog.GetPath();
 591
 592     // load it and search for Content-Type header
 593     wxTextFile file(filename);
 594     if ( !file.Open() )
 595         return;
 596
 597     wxString charset;
 598
 599     static const wxChar *prefix = wxT("Content-Type: text/plain; charset=");
 600     const size_t len = wxStrlen(prefix);
 601
 602     size_t n, count = file.GetLineCount();
 603     for ( n = 0; n < count; n++ )
 604     {
 605         wxString line = file[n];
 606
 607         if ( !line )
 608         {
 609             // if it is an email message, headers are over, no need to parse
 610             // all the file
 611             break;
 612         }
 613
 614         if ( line.Left(len) == prefix )
 615         {
 616             // found!
 617             const wxChar *pc = line.c_str() + len;
 618             if ( *pc == wxT('"') )
 619                 pc++;
 620
 621             while ( *pc && *pc != wxT('"') )
 622             {
 623                 charset += *pc++;
 624             }
 625
 626             break;
 627         }
 628     }
 629
 630     if ( !charset )
 631     {
 632         wxLogError(wxT("The file '%s' doesn't contain charset information."),
 633                    filename.c_str());
 634
 635         return;
 636     }
 637
 638     // ok, now get the corresponding encoding
 639     wxFontEncoding fontenc = wxFontMapper::Get()->CharsetToEncoding(charset);
 640     if ( fontenc == wxFONTENCODING_SYSTEM )
 641     {
 642         wxLogError(wxT("Charset '%s' is unsupported."), charset.c_str());
 643         return;
 644     }
 645
 646     m_textctrl->LoadFile(filename);
 647
 648     if ( fontenc == wxFONTENCODING_UTF8 ||
 649             !wxFontMapper::Get()->IsEncodingAvailable(fontenc) )
 650     {
 651         // try to find some similar encoding:
 652         wxFontEncoding encAlt;
 653         if ( wxFontMapper::Get()->GetAltForEncoding(fontenc, &encAlt) )
 654         {
 655             wxEncodingConverter conv;
 656
 657             if (conv.Init(fontenc, encAlt))
 658             {
 659                 fontenc = encAlt;
 660                 m_textctrl -> SetValue(conv.Convert(m_textctrl -> GetValue()));
 661             }
 662             else
 663             {
 664                 wxLogWarning(wxT("Cannot convert from '%s' to '%s'."),
 665                              wxFontMapper::GetEncodingDescription(fontenc).c_str(),
 666                              wxFontMapper::GetEncodingDescription(encAlt).c_str());
 667             }
 668         }
 669         else
 670             wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
 671                          wxFontMapper::GetEncodingDescription(fontenc).c_str());
 672     }
 673
 674     // and now create the correct font
 675     if ( !DoEnumerateFamilies(false, fontenc, true /* silent */) )
 676     {
 677         wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 678                     wxFONTWEIGHT_NORMAL, false /* !underlined */,
 679                     wxEmptyString /* facename */, fontenc);
 680         if ( font.Ok() )
 681         {
 682             DoChangeFont(font);
 683         }
 684         else
 685         {
 686             wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
 687                          wxFontMapper::GetEncodingDescription(fontenc).c_str());
 688         }
 689     }
 690 }
 691
 692 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 693 {
 694     wxMessageBox(wxT("wxWidgets font demo\n")
 695                  wxT("(c) 1999 Vadim Zeitlin"),
 696                  wxT("About Font"),
 697                  wxOK | wxICON_INFORMATION, this);
 698 }
 699
 700 // ----------------------------------------------------------------------------
 701 // MyCanvas
 702 // ----------------------------------------------------------------------------
 703
 704 BEGIN_EVENT_TABLE(MyCanvas, wxWindow)
 705     EVT_PAINT(MyCanvas::OnPaint)
 706 END_EVENT_TABLE()
 707
 708 MyCanvas::MyCanvas( wxWindow *parent )
 709         : wxWindow( parent, wxID_ANY ),
 710           m_colour(*wxRED), m_font(*wxNORMAL_FONT)
 711 {
 712 }
 713
 714 MyCanvas::~MyCanvas()
 715 {
 716 }
 717
 718 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 719 {
 720     wxPaintDC dc(this);
 721     PrepareDC(dc);
 722
 723     // set background
 724     dc.SetBackground(wxBrush(wxT("white"), wxSOLID));
 725     dc.Clear();
 726
 727     // one text line height
 728     wxCoord hLine = dc.GetCharHeight();
 729
 730     // the current text origin
 731     wxCoord x = 5,
 732             y = 5;
 733
 734     // output the font name/info
 735     wxString fontInfo;
 736     fontInfo.Printf(wxT("Font size is %d points, family: %s, encoding: %s"),
 737                     m_font.GetPointSize(),
 738                     m_font.GetFamilyString().c_str(),
 739                     wxFontMapper::Get()->
 740                         GetEncodingDescription(m_font.GetEncoding()).c_str());
 741
 742     dc.DrawText(fontInfo, x, y);
 743     y += hLine;
 744
 745     fontInfo.Printf(wxT("Style: %s, weight: %s, fixed width: %s"),
 746                     m_font.GetStyleString().c_str(),
 747                     m_font.GetWeightString().c_str(),
 748                     m_font.IsFixedWidth() ? _T("yes") : _T("no"));
 749
 750     dc.DrawText(fontInfo, x, y);
 751     y += hLine;
 752
 753     if ( m_font.Ok() )
 754     {
 755         const wxNativeFontInfo *info = m_font.GetNativeFontInfo();
 756         if ( info )
 757         {
 758             wxString fontDesc = m_font.GetNativeFontInfoUserDesc();
 759             fontInfo.Printf(wxT("Native font info: %s"), fontDesc.c_str());
 760
 761             dc.DrawText(fontInfo, x, y);
 762             y += hLine;
 763         }
 764     }
 765
 766     y += hLine;
 767
 768     // prepare to draw the font
 769     dc.SetFont(m_font);
 770     dc.SetTextForeground(m_colour);
 771
 772     // the size of one cell (Normally biggest char + small margin)
 773     long maxCharWidth, maxCharHeight;
 774     dc.GetTextExtent(wxT("W"), &maxCharWidth, &maxCharHeight);
 775     int w = maxCharWidth + 5,
 776         h = maxCharHeight + 4;
 777
 778
 779     // print all font symbols from 32 to 256 in 7 rows of 32 chars each
 780     for ( int i = 0; i < 7; i++ )
 781     {
 782         for ( int j = 0; j < 32; j++ )
 783         {
 784             wxChar c = 32 * (i + 1) + j;
 785
 786             long charWidth, charHeight;
 787             dc.GetTextExtent(c, &charWidth, &charHeight);
 788             dc.DrawText
 789             (
 790                 c,
 791                 x + w*j + (maxCharWidth - charWidth) / 2 + 1,
 792                 y + h*i + (maxCharHeight - charHeight) / 2
 793             );
 794         }
 795     }
 796
 797     // draw the lines between them
 798     dc.SetPen(wxPen(wxColour(_T("blue")), 1, wxSOLID));
 799     int l;
 800
 801     // horizontal
 802     for ( l = 0; l < 8; l++ )
 803     {
 804         int yl = y + h*l - 2;
 805         dc.DrawLine(x - 2, yl, x + 32*w - 1, yl);
 806     }
 807
 808     // and vertical
 809     for ( l = 0; l < 33; l++ )
 810     {
 811         int xl = x + w*l - 2;
 812         dc.DrawLine(xl, y - 2, xl, y + 7*h - 1);
 813     }
 814 }