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 // used as title for several dialog boxes
  43 static const wxChar SAMPLE_TITLE[] = "wxWidgets Font Sample";
  44
  45 // ----------------------------------------------------------------------------
  46 // private classes
  47 // ----------------------------------------------------------------------------
  48
  49 // Define a new application type, each program should derive a class from wxApp
  50 class MyApp : public wxApp
  51 {
  52 public:
  53     // override base class virtuals
  54     // ----------------------------
  55
  56     // this one is called on application startup and is a good place for the app
  57     // initialization (doing it here and not in the ctor allows to have an error
  58     // return: if OnInit() returns false, the application terminates)
  59     virtual bool OnInit();
  60 };
  61
  62 // MyCanvas is a canvas on which we show the font sample
  63 class MyCanvas: public wxWindow
  64 {
  65 public:
  66     MyCanvas( wxWindow *parent );
  67     virtual ~MyCanvas(){};
  68
  69     // accessors for the frame
  70     const wxFont& GetTextFont() const { return m_font; }
  71     const wxColour& GetColour() const { return m_colour; }
  72     void SetTextFont(const wxFont& font) { m_font = font; }
  73     void SetColour(const wxColour& colour) { m_colour = colour; }
  74
  75     // event handlers
  76     void OnPaint( wxPaintEvent &event );
  77
  78 private:
  79     wxColour m_colour;
  80     wxFont   m_font;
  81
  82     DECLARE_EVENT_TABLE()
  83 };
  84
  85 // Define a new frame type: this is going to be our main frame
  86 class MyFrame : public wxFrame
  87 {
  88 public:
  89     // ctor(s)
  90     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  91
  92     // accessors
  93     MyCanvas *GetCanvas() const { return m_canvas; }
  94
  95     // event handlers (these functions should _not_ be virtual)
  96     void OnQuit(wxCommandEvent& event);
  97     void OnAbout(wxCommandEvent& event);
  98
  99     void OnIncFont(wxCommandEvent& WXUNUSED(event)) { DoResizeFont(+2); }
 100     void OnDecFont(wxCommandEvent& WXUNUSED(event)) { DoResizeFont(-2); }
 101
 102     void OnBold(wxCommandEvent& event);
 103     void OnItalic(wxCommandEvent& event);
 104     void OnUnderline(wxCommandEvent& event);
 105
 106     void OnwxPointerFont(wxCommandEvent& event);
 107
 108     void OnViewMsg(wxCommandEvent& event);
 109     void OnSelectFont(wxCommandEvent& event);
 110     void OnEnumerateFamiliesForEncoding(wxCommandEvent& event);
 111     void OnEnumerateFamilies(wxCommandEvent& WXUNUSED(event))
 112         { DoEnumerateFamilies(false); }
 113     void OnEnumerateFixedFamilies(wxCommandEvent& WXUNUSED(event))
 114         { DoEnumerateFamilies(true); }
 115     void OnEnumerateEncodings(wxCommandEvent& event);
 116
 117     void OnSetNativeDesc(wxCommandEvent& event);
 118     void OnSetNativeUserDesc(wxCommandEvent& event);
 119     void OnSetFaceName(wxCommandEvent& event);
 120     void OnSetEncoding(wxCommandEvent& event);
 121
 122 protected:
 123     bool DoEnumerateFamilies(bool fixedWidthOnly,
 124                              wxFontEncoding encoding = wxFONTENCODING_SYSTEM,
 125                              bool silent = false);
 126
 127     void DoResizeFont(int diff);
 128     void DoChangeFont(const wxFont& font, const wxColour& col = wxNullColour);
 129
 130     // ask the user to choose an encoding and return it or
 131     // wxFONTENCODING_SYSTEM if the dialog was cancelled
 132     wxFontEncoding GetEncodingFromUser();
 133
 134
 135     size_t      m_fontSize; // in points
 136
 137     wxTextCtrl *m_textctrl;
 138     MyCanvas   *m_canvas;
 139
 140 private:
 141     // any class wishing to process wxWidgets events must use this macro
 142     DECLARE_EVENT_TABLE()
 143 };
 144
 145 // ----------------------------------------------------------------------------
 146 // constants
 147 // ----------------------------------------------------------------------------
 148
 149 // IDs for the controls and the menu commands
 150 enum
 151 {
 152     // menu items
 153     Font_Quit = 1,
 154     Font_About,
 155     Font_ViewMsg,
 156     Font_IncSize,
 157     Font_DecSize,
 158     Font_Bold,
 159     Font_Italic,
 160     Font_Underlined,
 161     Font_wxNORMAL_FONT,
 162     Font_wxSMALL_FONT,
 163     Font_wxITALIC_FONT,
 164     Font_wxSWISS_FONT,
 165     Font_Standard,
 166
 167     Font_Choose = 100,
 168     Font_EnumFamiliesForEncoding,
 169     Font_EnumFamilies,
 170     Font_EnumFixedFamilies,
 171     Font_EnumEncodings,
 172     Font_SetNativeDesc,
 173     Font_SetNativeUserDesc,
 174     Font_SetFaceName,
 175     Font_SetEncoding,
 176     Font_Max
 177 };
 178
 179 // ----------------------------------------------------------------------------
 180 // event tables and other macros for wxWidgets
 181 // ----------------------------------------------------------------------------
 182
 183 // the event tables connect the wxWidgets events with the functions (event
 184 // handlers) which process them. It can be also done at run-time, but for the
 185 // simple menu events like this the static method is much simpler.
 186 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 187     EVT_MENU(Font_Quit,  MyFrame::OnQuit)
 188     EVT_MENU(Font_ViewMsg, MyFrame::OnViewMsg)
 189     EVT_MENU(Font_About, MyFrame::OnAbout)
 190
 191     EVT_MENU(Font_IncSize, MyFrame::OnIncFont)
 192     EVT_MENU(Font_DecSize, MyFrame::OnDecFont)
 193     EVT_MENU(Font_Bold, MyFrame::OnBold)
 194     EVT_MENU(Font_Italic, MyFrame::OnItalic)
 195     EVT_MENU(Font_Underlined, MyFrame::OnUnderline)
 196
 197     EVT_MENU(Font_wxNORMAL_FONT, MyFrame::OnwxPointerFont)
 198     EVT_MENU(Font_wxSMALL_FONT, MyFrame::OnwxPointerFont)
 199     EVT_MENU(Font_wxITALIC_FONT, MyFrame::OnwxPointerFont)
 200     EVT_MENU(Font_wxSWISS_FONT, MyFrame::OnwxPointerFont)
 201
 202
 203     EVT_MENU(Font_SetNativeDesc, MyFrame::OnSetNativeDesc)
 204     EVT_MENU(Font_SetNativeUserDesc, MyFrame::OnSetNativeUserDesc)
 205     EVT_MENU(Font_SetFaceName, MyFrame::OnSetFaceName)
 206     EVT_MENU(Font_SetEncoding, MyFrame::OnSetEncoding)
 207
 208     EVT_MENU(Font_Choose, MyFrame::OnSelectFont)
 209     EVT_MENU(Font_EnumFamiliesForEncoding, MyFrame::OnEnumerateFamiliesForEncoding)
 210     EVT_MENU(Font_EnumFamilies, MyFrame::OnEnumerateFamilies)
 211     EVT_MENU(Font_EnumFixedFamilies, MyFrame::OnEnumerateFixedFamilies)
 212     EVT_MENU(Font_EnumEncodings, MyFrame::OnEnumerateEncodings)
 213 END_EVENT_TABLE()
 214
 215 // Create a new application object: this macro will allow wxWidgets to create
 216 // the application object during program execution (it's better than using a
 217 // static object for many reasons) and also declares the accessor function
 218 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 219 // not wxApp)
 220 IMPLEMENT_APP(MyApp)
 221
 222 // ============================================================================
 223 // implementation
 224 // ============================================================================
 225
 226 // ----------------------------------------------------------------------------
 227 // the application class
 228 // ----------------------------------------------------------------------------
 229
 230 // `Main program' equivalent: the program execution "starts" here
 231 bool MyApp::OnInit()
 232 {
 233     // Create the main application window
 234     MyFrame *frame = new MyFrame(wxT("Font wxWidgets demo"),
 235                                  wxPoint(50, 50), wxSize(600, 400));
 236
 237     // Show it and tell the application that it's our main window
 238     frame->Show(true);
 239     SetTopWindow(frame);
 240
 241     // success: wxApp::OnRun() will be called which will enter the main message
 242     // loop and the application will run. If we returned 'false' here, the
 243     // application would exit immediately.
 244     return true;
 245 }
 246
 247 // ----------------------------------------------------------------------------
 248 // main frame
 249 // ----------------------------------------------------------------------------
 250
 251 // frame constructor
 252 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 253        : wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size), m_textctrl(NULL)
 254 {
 255     m_fontSize = 12;
 256
 257     SetIcon(wxIcon(sample_xpm));
 258
 259     // create a menu bar
 260     wxMenu *menuFile = new wxMenu;
 261
 262     menuFile->Append(Font_ViewMsg, wxT("&View...\tCtrl-V"),
 263                      wxT("View an email message file"));
 264     menuFile->AppendSeparator();
 265     menuFile->Append(Font_About, wxT("&About...\tCtrl-A"), wxT("Show about dialog"));
 266     menuFile->AppendSeparator();
 267     menuFile->Append(Font_Quit, wxT("E&xit\tAlt-X"), wxT("Quit this program"));
 268
 269     wxMenu *menuFont = new wxMenu;
 270     menuFont->Append(Font_IncSize, wxT("&Increase font size by 2 points\tCtrl-I"));
 271     menuFont->Append(Font_DecSize, wxT("&Decrease font size by 2 points\tCtrl-D"));
 272     menuFont->AppendSeparator();
 273     menuFont->AppendCheckItem(Font_Bold, wxT("&Bold\tCtrl-B"), wxT("Toggle bold state"));
 274     menuFont->AppendCheckItem(Font_Italic, wxT("&Oblique\tCtrl-O"), wxT("Toggle italic state"));
 275     menuFont->AppendCheckItem(Font_Underlined, wxT("&Underlined\tCtrl-U"),
 276                      wxT("Toggle underlined state"));
 277
 278     menuFont->AppendSeparator();
 279     menuFont->Append(Font_SetNativeDesc,
 280                      wxT("Set native font &description\tShift-Ctrl-D"));
 281     menuFont->Append(Font_SetNativeUserDesc,
 282                      wxT("Set &user font description\tShift-Ctrl-U"));
 283     menuFont->Append(Font_SetFaceName, wxT("Check font face name"));
 284     menuFont->Append(Font_SetEncoding, wxT("Set font &encoding\tShift-Ctrl-E"));
 285
 286     wxMenu *menuSelect = new wxMenu;
 287     menuSelect->Append(Font_Choose, wxT("&Select font...\tCtrl-S"),
 288                      wxT("Select a standard font"));
 289
 290     wxMenu *menuStdFonts = new wxMenu;
 291     menuStdFonts->Append(Font_wxNORMAL_FONT, wxT("wxNORMAL_FONT"), wxT("Normal font used by wxWidgets"));
 292     menuStdFonts->Append(Font_wxSMALL_FONT,  wxT("wxSMALL_FONT"),  wxT("Small font used by wxWidgets"));
 293     menuStdFonts->Append(Font_wxITALIC_FONT, wxT("wxITALIC_FONT"), wxT("Italic font used by wxWidgets"));
 294     menuStdFonts->Append(Font_wxSWISS_FONT,  wxT("wxSWISS_FONT"),  wxT("Swiss font used by wxWidgets"));
 295     menuSelect->Append(Font_Standard, wxT("Standar&d fonts"), menuStdFonts);
 296
 297     menuSelect->AppendSeparator();
 298     menuSelect->Append(Font_EnumFamilies, wxT("Enumerate font &families\tCtrl-F"));
 299     menuSelect->Append(Font_EnumFixedFamilies,
 300                      wxT("Enumerate fi&xed font families\tCtrl-X"));
 301     menuSelect->Append(Font_EnumEncodings,
 302                      wxT("Enumerate &encodings\tCtrl-E"));
 303     menuSelect->Append(Font_EnumFamiliesForEncoding,
 304                      wxT("Find font for en&coding...\tCtrl-C"),
 305                      wxT("Find font families for given encoding"));
 306
 307     // now append the freshly created menu to the menu bar...
 308     wxMenuBar *menuBar = new wxMenuBar;
 309     menuBar->Append(menuFile, wxT("&File"));
 310     menuBar->Append(menuFont, wxT("F&ont"));
 311     menuBar->Append(menuSelect, wxT("&Select"));
 312
 313     // ... and attach this menu bar to the frame
 314     SetMenuBar(menuBar);
 315
 316     wxSplitterWindow *splitter = new wxSplitterWindow(this);
 317
 318     m_textctrl = new wxTextCtrl(splitter, wxID_ANY,
 319                                 wxT("Paste text here to see how it looks\nlike in the given font"),
 320                                 wxDefaultPosition, wxDefaultSize,
 321                                 wxTE_MULTILINE);
 322
 323     m_canvas = new MyCanvas(splitter);
 324
 325     splitter->SplitHorizontally(m_textctrl, m_canvas, 100);
 326
 327 #if wxUSE_STATUSBAR
 328     // create a status bar just for fun (by default with 1 pane only)
 329     CreateStatusBar();
 330     SetStatusText(wxT("Welcome to wxWidgets font demo!"));
 331 #endif // wxUSE_STATUSBAR
 332 }
 333
 334 // --------------------------------------------------------
 335
 336 class MyEncodingEnumerator : public wxFontEnumerator
 337 {
 338 public:
 339     MyEncodingEnumerator()
 340         { m_n = 0; }
 341
 342     const wxString& GetText() const
 343         { return m_text; }
 344
 345 protected:
 346     virtual bool OnFontEncoding(const wxString& facename,
 347                                 const wxString& encoding)
 348     {
 349         wxString text;
 350         text.Printf(wxT("Encoding %u: %s (available in facename '%s')\n"),
 351                     (unsigned int) ++m_n, encoding.c_str(), facename.c_str());
 352         m_text += text;
 353         return true;
 354     }
 355
 356 private:
 357     size_t m_n;
 358     wxString m_text;
 359 };
 360
 361 void MyFrame::OnEnumerateEncodings(wxCommandEvent& WXUNUSED(event))
 362 {
 363     MyEncodingEnumerator fontEnumerator;
 364
 365     fontEnumerator.EnumerateEncodings();
 366
 367     wxLogMessage(wxT("Enumerating all available encodings:\n%s"),
 368                  fontEnumerator.GetText().c_str());
 369 }
 370
 371 // -------------------------------------------------------------
 372
 373 class MyFontEnumerator : public wxFontEnumerator
 374 {
 375 public:
 376     bool GotAny() const
 377         { return !m_facenames.IsEmpty(); }
 378
 379     const wxArrayString& GetFacenames() const
 380         { return m_facenames; }
 381
 382 protected:
 383     virtual bool OnFacename(const wxString& facename)
 384     {
 385         m_facenames.Add(facename);
 386         return true;
 387     }
 388
 389     private:
 390         wxArrayString m_facenames;
 391 } fontEnumerator;
 392
 393 bool MyFrame::DoEnumerateFamilies(bool fixedWidthOnly,
 394                                   wxFontEncoding encoding,
 395                                   bool silent)
 396 {
 397     MyFontEnumerator fontEnumerator;
 398
 399     fontEnumerator.EnumerateFacenames(encoding, fixedWidthOnly);
 400
 401     if ( fontEnumerator.GotAny() )
 402     {
 403         int nFacenames = fontEnumerator.GetFacenames().GetCount();
 404         if ( !silent )
 405         {
 406             wxLogStatus(this, wxT("Found %d %sfonts"),
 407                         nFacenames, fixedWidthOnly ? wxT("fixed width ") : wxT(""));
 408         }
 409
 410         wxString facename;
 411
 412         if ( silent )
 413         {
 414             // choose the first
 415             facename = fontEnumerator.GetFacenames().Item(0);
 416         }
 417         else
 418         {
 419             // let the user choose
 420             wxString *facenames = new wxString[nFacenames];
 421             int n;
 422             for ( n = 0; n < nFacenames; n++ )
 423                 facenames[n] = fontEnumerator.GetFacenames().Item(n);
 424
 425             n = wxGetSingleChoiceIndex
 426                 (
 427                     wxT("Choose a facename"),
 428                     SAMPLE_TITLE,
 429                     nFacenames,
 430                     facenames,
 431                     this
 432                 );
 433
 434             if ( n != -1 )
 435                 facename = facenames[n];
 436
 437             delete [] facenames;
 438         }
 439
 440         if ( !facename.empty() )
 441         {
 442             wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 443                         wxFONTWEIGHT_NORMAL, false, facename, encoding);
 444
 445             DoChangeFont(font);
 446         }
 447
 448         return true;
 449     }
 450     else if ( !silent )
 451     {
 452         wxLogWarning(wxT("No such fonts found."));
 453     }
 454
 455     return false;
 456 }
 457
 458 void MyFrame::OnEnumerateFamiliesForEncoding(wxCommandEvent& WXUNUSED(event))
 459 {
 460     wxFontEncoding enc = GetEncodingFromUser();
 461     if ( enc != wxFONTENCODING_SYSTEM )
 462     {
 463         DoEnumerateFamilies(false, enc);
 464     }
 465 }
 466
 467 void MyFrame::OnSetNativeDesc(wxCommandEvent& WXUNUSED(event))
 468 {
 469     wxString fontInfo = wxGetTextFromUser
 470                         (
 471                             wxT("Enter native font string"),
 472                             wxT("Input font description"),
 473                             m_canvas->GetTextFont().GetNativeFontInfoDesc(),
 474                             this
 475                         );
 476     if ( fontInfo.empty() )
 477         return;     // user clicked "Cancel" - do nothing
 478
 479     wxFont font;
 480     font.SetNativeFontInfo(fontInfo);
 481     if ( !font.Ok() )
 482     {
 483         wxLogError(wxT("Font info string \"%s\" is invalid."),
 484                    fontInfo.c_str());
 485         return;
 486     }
 487
 488     DoChangeFont(font);
 489 }
 490
 491 void MyFrame::OnSetFaceName(wxCommandEvent& WXUNUSED(event))
 492 {
 493     wxString facename = GetCanvas()->GetTextFont().GetFaceName();
 494     wxString newFaceName = wxGetTextFromUser(
 495             wxT("Here you can edit current font face name."),
 496             wxT("Input font facename"), facename,
 497             this);
 498     if (newFaceName.IsEmpty())
 499         return;     // user clicked "Cancel" - do nothing
 500
 501     wxFont font(GetCanvas()->GetTextFont());
 502     if (font.SetFaceName(newFaceName))      // change facename only
 503     {
 504         wxASSERT_MSG(font.Ok(), wxT("The font should now be valid"));
 505         DoChangeFont(font);
 506     }
 507     else
 508     {
 509         wxASSERT_MSG(!font.Ok(), wxT("The font should now be invalid"));
 510         wxMessageBox(wxT("There is no font with such face name..."),
 511                      wxT("Invalid face name"), wxOK|wxICON_ERROR, this);
 512     }
 513 }
 514
 515 void MyFrame::OnSetNativeUserDesc(wxCommandEvent& WXUNUSED(event))
 516 {
 517     wxString fontdesc = GetCanvas()->GetTextFont().GetNativeFontInfoUserDesc();
 518     wxString fontUserInfo = wxGetTextFromUser(
 519             wxT("Here you can edit current font description"),
 520             wxT("Input font description"), fontdesc,
 521             this);
 522     if (fontUserInfo.IsEmpty())
 523         return;     // user clicked "Cancel" - do nothing
 524
 525     wxFont font;
 526     if (font.SetNativeFontInfoUserDesc(fontUserInfo))
 527     {
 528         wxASSERT_MSG(font.Ok(), wxT("The font should now be valid"));
 529         DoChangeFont(font);
 530     }
 531     else
 532     {
 533         wxASSERT_MSG(!font.Ok(), wxT("The font should now be invalid"));
 534         wxMessageBox(wxT("Error trying to create a font with such description..."));
 535     }
 536 }
 537
 538 void MyFrame::OnSetEncoding(wxCommandEvent& WXUNUSED(event))
 539 {
 540     wxFontEncoding enc = GetEncodingFromUser();
 541     if ( enc == wxFONTENCODING_SYSTEM )
 542         return;
 543
 544     wxFont font = m_canvas->GetTextFont();
 545     font.SetEncoding(enc);
 546     DoChangeFont(font);
 547 }
 548
 549 wxFontEncoding MyFrame::GetEncodingFromUser()
 550 {
 551     wxArrayString names;
 552     wxArrayInt encodings;
 553
 554     const size_t count = wxFontMapper::GetSupportedEncodingsCount();
 555     names.reserve(count);
 556     encodings.reserve(count);
 557
 558     for ( size_t n = 0; n < count; n++ )
 559     {
 560         wxFontEncoding enc = wxFontMapper::GetEncoding(n);
 561         encodings.push_back(enc);
 562         names.push_back(wxFontMapper::GetEncodingName(enc));
 563     }
 564
 565     int i = wxGetSingleChoiceIndex
 566             (
 567                 wxT("Choose the encoding"),
 568                 SAMPLE_TITLE,
 569                 names,
 570                 this
 571             );
 572
 573     return i == -1 ? wxFONTENCODING_SYSTEM : (wxFontEncoding)encodings[i];
 574 }
 575
 576 void MyFrame::DoResizeFont(int diff)
 577 {
 578     wxFont font = m_canvas->GetTextFont();
 579
 580     font.SetPointSize(font.GetPointSize() + diff);
 581     DoChangeFont(font);
 582 }
 583
 584 void MyFrame::OnBold(wxCommandEvent& event)
 585 {
 586     wxFont font = m_canvas->GetTextFont();
 587
 588     font.SetWeight(event.IsChecked() ? wxFONTWEIGHT_BOLD : wxFONTWEIGHT_NORMAL);
 589     DoChangeFont(font);
 590 }
 591
 592 void MyFrame::OnItalic(wxCommandEvent& event)
 593 {
 594     wxFont font = m_canvas->GetTextFont();
 595
 596     font.SetStyle(event.IsChecked() ? wxFONTSTYLE_ITALIC : wxFONTSTYLE_NORMAL);
 597     DoChangeFont(font);
 598 }
 599
 600 void MyFrame::OnUnderline(wxCommandEvent& event)
 601 {
 602     wxFont font = m_canvas->GetTextFont();
 603
 604     font.SetUnderlined(event.IsChecked());
 605     DoChangeFont(font);
 606 }
 607
 608 void MyFrame::OnwxPointerFont(wxCommandEvent& event)
 609 {
 610     wxFont font;
 611
 612     switch ( event.GetId() )
 613     {
 614         case Font_wxNORMAL_FONT:
 615             font = *wxNORMAL_FONT;
 616             break;
 617
 618         case Font_wxSMALL_FONT:
 619             font = *wxSMALL_FONT;
 620             break;
 621
 622         case Font_wxITALIC_FONT:
 623             font = *wxITALIC_FONT;
 624             break;
 625
 626         case Font_wxSWISS_FONT:
 627             font = *wxSWISS_FONT;
 628             break;
 629
 630         default:
 631             wxFAIL_MSG( wxT("unknown standard font") );
 632             return;
 633     }
 634
 635     DoChangeFont(font);
 636 }
 637
 638 void MyFrame::DoChangeFont(const wxFont& font, const wxColour& col)
 639 {
 640     m_canvas->SetTextFont(font);
 641     if ( col.Ok() )
 642         m_canvas->SetColour(col);
 643     m_canvas->Refresh();
 644
 645     m_textctrl->SetFont(font);
 646     if ( col.Ok() )
 647         m_textctrl->SetForegroundColour(col);
 648
 649     // update the state of the bold/italic/underlined menu items
 650     wxMenuBar *mbar = GetMenuBar();
 651     if ( mbar )
 652     {
 653         mbar->Check(Font_Bold, font.GetWeight() == wxFONTWEIGHT_BOLD);
 654         mbar->Check(Font_Italic, font.GetStyle() == wxFONTSTYLE_ITALIC);
 655         mbar->Check(Font_Underlined, font.GetUnderlined());
 656     }
 657 }
 658
 659 void MyFrame::OnSelectFont(wxCommandEvent& WXUNUSED(event))
 660 {
 661     wxFontData data;
 662     data.SetInitialFont(m_canvas->GetTextFont());
 663     data.SetColour(m_canvas->GetColour());
 664
 665     wxFontDialog dialog(this, data);
 666     if ( dialog.ShowModal() == wxID_OK )
 667     {
 668         wxFontData retData = dialog.GetFontData();
 669         wxFont font = retData.GetChosenFont();
 670         wxColour colour = retData.GetColour();
 671
 672         DoChangeFont(font, colour);
 673     }
 674 }
 675
 676 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 677 {
 678     // true is to force the frame to close
 679     Close(true);
 680 }
 681
 682 void MyFrame::OnViewMsg(wxCommandEvent& WXUNUSED(event))
 683 {
 684 #if wxUSE_FILEDLG
 685     // first, choose the file
 686     static wxString s_dir, s_file;
 687     wxFileDialog dialog(this, wxT("Open an email message file"),
 688                         s_dir, s_file);
 689     if ( dialog.ShowModal() != wxID_OK )
 690         return;
 691
 692     // save for the next time
 693     s_dir = dialog.GetDirectory();
 694     s_file = dialog.GetFilename();
 695
 696     wxString filename = dialog.GetPath();
 697
 698     // load it and search for Content-Type header
 699     wxTextFile file(filename);
 700     if ( !file.Open() )
 701         return;
 702
 703     wxString charset;
 704
 705     static const wxChar *prefix = wxT("Content-Type: text/plain; charset=");
 706     const size_t len = wxStrlen(prefix);
 707
 708     size_t n, count = file.GetLineCount();
 709     for ( n = 0; n < count; n++ )
 710     {
 711         wxString line = file[n];
 712
 713         if ( !line )
 714         {
 715             // if it is an email message, headers are over, no need to parse
 716             // all the file
 717             break;
 718         }
 719
 720         if ( line.Left(len) == prefix )
 721         {
 722             // found!
 723             const wxChar *pc = line.c_str() + len;
 724             if ( *pc == wxT('"') )
 725                 pc++;
 726
 727             while ( *pc && *pc != wxT('"') )
 728             {
 729                 charset += *pc++;
 730             }
 731
 732             break;
 733         }
 734     }
 735
 736     if ( !charset )
 737     {
 738         wxLogError(wxT("The file '%s' doesn't contain charset information."),
 739                    filename.c_str());
 740
 741         return;
 742     }
 743
 744     // ok, now get the corresponding encoding
 745     wxFontEncoding fontenc = wxFontMapper::Get()->CharsetToEncoding(charset);
 746     if ( fontenc == wxFONTENCODING_SYSTEM )
 747     {
 748         wxLogError(wxT("Charset '%s' is unsupported."), charset.c_str());
 749         return;
 750     }
 751
 752     m_textctrl->LoadFile(filename);
 753
 754     if ( fontenc == wxFONTENCODING_UTF8 ||
 755             !wxFontMapper::Get()->IsEncodingAvailable(fontenc) )
 756     {
 757         // try to find some similar encoding:
 758         wxFontEncoding encAlt;
 759         if ( wxFontMapper::Get()->GetAltForEncoding(fontenc, &encAlt) )
 760         {
 761             wxEncodingConverter conv;
 762
 763             if (conv.Init(fontenc, encAlt))
 764             {
 765                 fontenc = encAlt;
 766                 m_textctrl -> SetValue(conv.Convert(m_textctrl -> GetValue()));
 767             }
 768             else
 769             {
 770                 wxLogWarning(wxT("Cannot convert from '%s' to '%s'."),
 771                              wxFontMapper::GetEncodingDescription(fontenc).c_str(),
 772                              wxFontMapper::GetEncodingDescription(encAlt).c_str());
 773             }
 774         }
 775         else
 776             wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
 777                          wxFontMapper::GetEncodingDescription(fontenc).c_str());
 778     }
 779
 780     // and now create the correct font
 781     if ( !DoEnumerateFamilies(false, fontenc, true /* silent */) )
 782     {
 783         wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 784                     wxFONTWEIGHT_NORMAL, false /* !underlined */,
 785                     wxEmptyString /* facename */, fontenc);
 786         if ( font.Ok() )
 787         {
 788             DoChangeFont(font);
 789         }
 790         else
 791         {
 792             wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
 793                          wxFontMapper::GetEncodingDescription(fontenc).c_str());
 794         }
 795     }
 796 #endif // wxUSE_FILEDLG
 797 }
 798
 799 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 800 {
 801     wxMessageBox(wxT("wxWidgets font demo\n")
 802                  wxT("(c) 1999 Vadim Zeitlin"),
 803                  wxT("About Font"),
 804                  wxOK | wxICON_INFORMATION, this);
 805 }
 806
 807 // ----------------------------------------------------------------------------
 808 // MyCanvas
 809 // ----------------------------------------------------------------------------
 810
 811 BEGIN_EVENT_TABLE(MyCanvas, wxWindow)
 812     EVT_PAINT(MyCanvas::OnPaint)
 813 END_EVENT_TABLE()
 814
 815 MyCanvas::MyCanvas( wxWindow *parent )
 816         : wxWindow( parent, wxID_ANY ),
 817           m_colour(*wxRED), m_font(*wxNORMAL_FONT)
 818 {
 819 }
 820
 821 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 822 {
 823     wxPaintDC dc(this);
 824     PrepareDC(dc);
 825
 826     // set background
 827     dc.SetBackground(wxBrush(wxT("white"), wxSOLID));
 828     dc.Clear();
 829
 830     // one text line height
 831     wxCoord hLine = dc.GetCharHeight();
 832
 833     // the current text origin
 834     wxCoord x = 5,
 835             y = 5;
 836
 837     // output the font name/info
 838     wxString fontInfo;
 839     fontInfo.Printf(wxT("Font size is %d points, family: %s, encoding: %s"),
 840                     m_font.GetPointSize(),
 841                     m_font.GetFamilyString().c_str(),
 842                     wxFontMapper::
 843                         GetEncodingDescription(m_font.GetEncoding()).c_str());
 844
 845     dc.DrawText(fontInfo, x, y);
 846     y += hLine;
 847
 848     fontInfo.Printf(wxT("Style: %s, weight: %s, fixed width: %s"),
 849                     m_font.GetStyleString().c_str(),
 850                     m_font.GetWeightString().c_str(),
 851                     m_font.IsFixedWidth() ? _T("yes") : _T("no"));
 852
 853     dc.DrawText(fontInfo, x, y);
 854     y += hLine;
 855
 856     if ( m_font.Ok() )
 857     {
 858         const wxNativeFontInfo *info = m_font.GetNativeFontInfo();
 859         if ( info )
 860         {
 861             wxString fontDesc = m_font.GetNativeFontInfoUserDesc();
 862             fontInfo.Printf(wxT("Native font info: %s"), fontDesc.c_str());
 863
 864             dc.DrawText(fontInfo, x, y);
 865             y += hLine;
 866         }
 867     }
 868
 869     y += hLine;
 870
 871     // prepare to draw the font
 872     dc.SetFont(m_font);
 873     dc.SetTextForeground(m_colour);
 874
 875     // the size of one cell (Normally biggest char + small margin)
 876     long maxCharWidth, maxCharHeight;
 877     dc.GetTextExtent(wxT("W"), &maxCharWidth, &maxCharHeight);
 878     int w = maxCharWidth + 5,
 879         h = maxCharHeight + 4;
 880
 881
 882     // print all font symbols from 32 to 256 in 7 rows of 32 chars each
 883     for ( int i = 0; i < 7; i++ )
 884     {
 885         for ( int j = 0; j < 32; j++ )
 886         {
 887             wxChar c = (wxChar)(32 * (i + 1) + j);
 888
 889             long charWidth, charHeight;
 890             dc.GetTextExtent(c, &charWidth, &charHeight);
 891             dc.DrawText
 892             (
 893                 c,
 894                 x + w*j + (maxCharWidth - charWidth) / 2 + 1,
 895                 y + h*i + (maxCharHeight - charHeight) / 2
 896             );
 897         }
 898     }
 899
 900     // draw the lines between them
 901     dc.SetPen(wxPen(wxColour(_T("blue")), 1, wxSOLID));
 902     int l;
 903
 904     // horizontal
 905     for ( l = 0; l < 8; l++ )
 906     {
 907         int yl = y + h*l - 2;
 908         dc.DrawLine(x - 2, yl, x + 32*w - 1, yl);
 909     }
 910
 911     // and vertical
 912     for ( l = 0; l < 33; l++ )
 913     {
 914         int xl = x + w*l - 2;
 915         dc.DrawLine(xl, y - 2, xl, y + 7*h - 1);
 916     }
 917 }