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/textfile.h>
  32
  33 // ----------------------------------------------------------------------------
  34 // private classes
  35 // ----------------------------------------------------------------------------
  36
  37 // Define a new application type, each program should derive a class from wxApp
  38 class MyApp : public wxApp
  39 {
  40 public:
  41     // override base class virtuals
  42     // ----------------------------
  43
  44     // this one is called on application startup and is a good place for the app
  45     // initialization (doing it here and not in the ctor allows to have an error
  46     // return: if OnInit() returns false, the application terminates)
  47     virtual bool OnInit();
  48 };
  49
  50 // MyCanvas is a canvas on which we show the font sample
  51 class MyCanvas: public wxWindow
  52 {
  53 public:
  54     MyCanvas( wxWindow *parent );
  55     ~MyCanvas();
  56
  57     // accessors for the frame
  58     const wxFont& GetTextFont() const { return m_font; }
  59     const wxColour& GetColour() const { return m_colour; }
  60     void SetTextFont(const wxFont& font) { m_font = font; }
  61     void SetColour(const wxColour& colour) { m_colour = colour; }
  62
  63     // event handlers
  64     void OnPaint( wxPaintEvent &event );
  65
  66 private:
  67     wxColour m_colour;
  68     wxFont   m_font;
  69
  70     DECLARE_EVENT_TABLE()
  71 };
  72
  73 // Define a new frame type: this is going to be our main frame
  74 class MyFrame : public wxFrame
  75 {
  76 public:
  77     // ctor(s)
  78     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  79
  80     // accessors
  81     MyCanvas *GetCanvas() const { return m_canvas; }
  82
  83     // event handlers (these functions should _not_ be virtual)
  84     void OnQuit(wxCommandEvent& event);
  85     void OnAbout(wxCommandEvent& event);
  86     void OnViewMsg(wxCommandEvent& event);
  87     void OnSelectFont(wxCommandEvent& event);
  88     void OnEnumerateFamiliesForEncoding(wxCommandEvent& event);
  89     void OnEnumerateFamilies(wxCommandEvent& WXUNUSED(event))
  90         { DoEnumerateFamilies(FALSE); }
  91     void OnEnumerateFixedFamilies(wxCommandEvent& WXUNUSED(event))
  92         { DoEnumerateFamilies(TRUE); }
  93     void OnEnumerateEncodings(wxCommandEvent& event);
  94
  95     void OnSize(wxSizeEvent& event);
  96
  97 protected:
  98     bool DoEnumerateFamilies(bool fixedWidthOnly,
  99                              wxFontEncoding encoding = wxFONTENCODING_SYSTEM,
 100                              bool silent = FALSE);
 101
 102     void DoChangeFont(const wxFont& font, const wxColour& col = wxNullColour);
 103
 104     void Resize(const wxSize& size, const wxFont& font = wxNullFont);
 105
 106     wxTextCtrl *m_textctrl;
 107     MyCanvas   *m_canvas;
 108
 109 private:
 110     // any class wishing to process wxWindows events must use this macro
 111     DECLARE_EVENT_TABLE()
 112 };
 113
 114 // ----------------------------------------------------------------------------
 115 // constants
 116 // ----------------------------------------------------------------------------
 117
 118 // IDs for the controls and the menu commands
 119 enum
 120 {
 121     // menu items
 122     Font_Quit = 1,
 123     Font_About,
 124     Font_ViewMsg,
 125     Font_Choose = 100,
 126     Font_EnumFamiliesForEncoding,
 127     Font_EnumFamilies,
 128     Font_EnumFixedFamilies,
 129     Font_EnumEncodings,
 130     Font_Max
 131 };
 132
 133 // ----------------------------------------------------------------------------
 134 // event tables and other macros for wxWindows
 135 // ----------------------------------------------------------------------------
 136
 137 // the event tables connect the wxWindows events with the functions (event
 138 // handlers) which process them. It can be also done at run-time, but for the
 139 // simple menu events like this the static method is much simpler.
 140 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 141     EVT_MENU(Font_Quit,  MyFrame::OnQuit)
 142     EVT_MENU(Font_About, MyFrame::OnAbout)
 143     EVT_MENU(Font_ViewMsg, MyFrame::OnViewMsg)
 144     EVT_MENU(Font_Choose, MyFrame::OnSelectFont)
 145     EVT_MENU(Font_EnumFamiliesForEncoding, MyFrame::OnEnumerateFamiliesForEncoding)
 146     EVT_MENU(Font_EnumFamilies, MyFrame::OnEnumerateFamilies)
 147     EVT_MENU(Font_EnumFixedFamilies, MyFrame::OnEnumerateFixedFamilies)
 148     EVT_MENU(Font_EnumEncodings, MyFrame::OnEnumerateEncodings)
 149
 150     EVT_SIZE(MyFrame::OnSize)
 151 END_EVENT_TABLE()
 152
 153 // Create a new application object: this macro will allow wxWindows to create
 154 // the application object during program execution (it's better than using a
 155 // static object for many reasons) and also declares the accessor function
 156 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 157 // not wxApp)
 158 IMPLEMENT_APP(MyApp)
 159
 160 // ============================================================================
 161 // implementation
 162 // ============================================================================
 163
 164 // ----------------------------------------------------------------------------
 165 // the application class
 166 // ----------------------------------------------------------------------------
 167
 168 // `Main program' equivalent: the program execution "starts" here
 169 bool MyApp::OnInit()
 170 {
 171     // Create the main application window
 172     MyFrame *frame = new MyFrame("Font wxWindows demo",
 173                                  wxPoint(50, 50), wxSize(450, 340));
 174
 175     // Show it and tell the application that it's our main window
 176     frame->Show(TRUE);
 177     SetTopWindow(frame);
 178
 179     // success: wxApp::OnRun() will be called which will enter the main message
 180     // loop and the application will run. If we returned FALSE here, the
 181     // application would exit immediately.
 182     return TRUE;
 183 }
 184
 185 // ----------------------------------------------------------------------------
 186 // main frame
 187 // ----------------------------------------------------------------------------
 188
 189 // frame constructor
 190 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 191        : wxFrame((wxFrame *)NULL, -1, title, pos, size), m_textctrl(NULL)
 192 {
 193     // create a menu bar
 194     wxMenu *menuFile = new wxMenu;
 195
 196     menuFile->Append(Font_ViewMsg, "&View...\tCtrl-V",
 197                      "View an email message file");
 198     menuFile->AppendSeparator();
 199     menuFile->Append(Font_About, "&About...\tCtrl-A", "Show about dialog");
 200     menuFile->AppendSeparator();
 201     menuFile->Append(Font_Quit, "E&xit\tAlt-X", "Quit this program");
 202
 203     wxMenu *menuFont = new wxMenu;
 204     menuFont->Append(Font_Choose, "&Select font...\tCtrl-S",
 205                      "Select a standard font");
 206     menuFont->AppendSeparator();
 207     menuFont->Append(Font_EnumFamilies, "Enumerate font &families\tCtrl-F");
 208     menuFont->Append(Font_EnumFixedFamilies,
 209                      "Enumerate f&ixed font families\tCtrl-I");
 210     menuFont->Append(Font_EnumEncodings,
 211                      "Enumerate &encodings\tCtrl-E");
 212     menuFont->Append(Font_EnumFamiliesForEncoding,
 213                      "Find font for en&coding...\tCtrl-C",
 214                      "Find font families for given encoding");
 215
 216     // now append the freshly created menu to the menu bar...
 217     wxMenuBar *menuBar = new wxMenuBar;
 218     menuBar->Append(menuFile, "&File");
 219     menuBar->Append(menuFont, "F&ont");
 220
 221     // ... and attach this menu bar to the frame
 222     SetMenuBar(menuBar);
 223
 224     m_textctrl = new wxTextCtrl(this, -1,
 225                                 "Paste text here to see how it looks\n"
 226                                 "like in the given font",
 227                                 wxDefaultPosition, wxDefaultSize,
 228                                 wxTE_MULTILINE);
 229
 230     m_canvas = new MyCanvas(this);
 231
 232     // create a status bar just for fun (by default with 1 pane only)
 233     CreateStatusBar();
 234     SetStatusText("Welcome to wxWindows font demo!");
 235 }
 236
 237
 238 // event handlers
 239 void MyFrame::OnEnumerateEncodings(wxCommandEvent& WXUNUSED(event))
 240 {
 241     class MyEncodingEnumerator : public wxFontEnumerator
 242     {
 243     public:
 244         MyEncodingEnumerator() { m_n = 0; }
 245
 246         const wxString& GetText() const { return m_text; }
 247
 248     protected:
 249         virtual bool OnFontEncoding(const wxString& facename,
 250                                     const wxString& encoding)
 251         {
 252             wxString text;
 253             text.Printf("Encoding %d: %s (available in facename '%s')\n",
 254                          ++m_n, encoding.c_str(), facename.c_str());
 255             m_text += text;
 256
 257             return TRUE;
 258         }
 259
 260     private:
 261         size_t m_n;
 262
 263         wxString m_text;
 264     } fontEnumerator;
 265
 266     fontEnumerator.EnumerateEncodings();
 267
 268     wxLogMessage("Enumerating all available encodings:\n%s",
 269                  fontEnumerator.GetText().c_str());
 270 }
 271
 272 bool MyFrame::DoEnumerateFamilies(bool fixedWidthOnly,
 273                                   wxFontEncoding encoding,
 274                                   bool silent)
 275 {
 276     class MyFontEnumerator : public wxFontEnumerator
 277     {
 278     public:
 279         bool GotAny() const { return !m_facenames.IsEmpty(); }
 280
 281         const wxArrayString& GetFacenames() const { return m_facenames; }
 282
 283     protected:
 284         virtual bool OnFacename(const wxString& facename)
 285         {
 286             m_facenames.Add(facename);
 287
 288             return TRUE;
 289         }
 290
 291     private:
 292         wxArrayString m_facenames;
 293     } fontEnumerator;
 294
 295     fontEnumerator.EnumerateFacenames(encoding, fixedWidthOnly);
 296
 297     if ( fontEnumerator.GotAny() )
 298     {
 299         int n, nFacenames = fontEnumerator.GetFacenames().GetCount();
 300         wxLogStatus(this, "Found %d %sfonts",
 301                     nFacenames, fixedWidthOnly ? "fixed width " : "");
 302
 303         wxString *facenames = new wxString[nFacenames];
 304         for ( n = 0; n < nFacenames; n++ )
 305             facenames[n] = fontEnumerator.GetFacenames().Item(n);
 306
 307         if ( silent )
 308             n = 0;
 309         else
 310             n = wxGetSingleChoiceIndex("Choose a facename", "Font demo",
 311                                        nFacenames, facenames, this);
 312         if ( n != -1 )
 313         {
 314             wxFont font(14, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 315                         wxFONTWEIGHT_NORMAL, FALSE, facenames[n], encoding);
 316
 317             DoChangeFont(font);
 318         }
 319
 320         delete [] facenames;
 321
 322         return TRUE;
 323     }
 324     else if ( !silent )
 325     {
 326         wxLogWarning("No such fonts found.");
 327     }
 328
 329     return FALSE;
 330 }
 331
 332 void MyFrame::OnEnumerateFamiliesForEncoding(wxCommandEvent& WXUNUSED(event))
 333 {
 334     static wxFontEncoding encodings[] =
 335     {
 336         wxFONTENCODING_ISO8859_1,
 337         wxFONTENCODING_ISO8859_2,
 338         wxFONTENCODING_ISO8859_5,
 339         wxFONTENCODING_ISO8859_7,
 340         wxFONTENCODING_ISO8859_15,
 341         wxFONTENCODING_KOI8,
 342         wxFONTENCODING_CP1250,
 343         wxFONTENCODING_CP1251,
 344         wxFONTENCODING_CP1252,
 345     };
 346
 347     static const char *encodingNames[] =
 348     {
 349         "West European (Latin 1)",
 350         "Central European (Latin 2)",
 351         "Cyrillic (Latin 5)",
 352         "Greek (Latin 7)",
 353         "West European new (Latin 0)",
 354         "KOI8-R",
 355         "Windows Latin 2",
 356         "Windows Cyrillic",
 357         "Windows Latin 1",
 358     };
 359
 360     int n = wxGetSingleChoiceIndex("Choose an encoding", "Font demo",
 361                                    WXSIZEOF(encodingNames),
 362                                    (char **)encodingNames,
 363                                    this);
 364
 365     if ( n != -1 )
 366     {
 367         DoEnumerateFamilies(FALSE, encodings[n]);
 368     }
 369 }
 370
 371 void MyFrame::DoChangeFont(const wxFont& font, const wxColour& col)
 372 {
 373     Resize(GetSize(), font);
 374
 375     m_canvas->SetTextFont(font);
 376     if ( col.Ok() )
 377         m_canvas->SetColour(col);
 378     m_canvas->Refresh();
 379
 380     m_textctrl->SetFont(font);
 381     if ( col.Ok() )
 382         m_textctrl->SetForegroundColour(col);
 383 }
 384
 385 void MyFrame::OnSelectFont(wxCommandEvent& WXUNUSED(event))
 386 {
 387     wxFontData data;
 388     data.SetInitialFont(m_canvas->GetTextFont());
 389     data.SetColour(m_canvas->GetColour());
 390
 391     wxFontDialog dialog(this, &data);
 392     if ( dialog.ShowModal() == wxID_OK )
 393     {
 394         wxFontData retData = dialog.GetFontData();
 395         wxFont font = retData.GetChosenFont();
 396         wxColour colour = retData.GetColour();
 397
 398         DoChangeFont(font, colour);
 399     }
 400 }
 401
 402 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 403 {
 404     // TRUE is to force the frame to close
 405     Close(TRUE);
 406 }
 407
 408 void MyFrame::OnViewMsg(wxCommandEvent& WXUNUSED(event))
 409 {
 410     // first, choose the file
 411     static wxString s_dir, s_file;
 412     wxFileDialog dialog(this, "Open an email message file",
 413                         s_dir, s_file);
 414     if ( dialog.ShowModal() != wxID_OK )
 415         return;
 416
 417     // save for the next time
 418     s_dir = dialog.GetDirectory();
 419     s_file = dialog.GetFilename();
 420
 421     wxString filename = dialog.GetPath();
 422
 423     // load it and search for Content-Type header
 424     wxTextFile file(filename);
 425     if ( !file.Open() )
 426         return;
 427
 428     wxString charset;
 429
 430     static const char *prefix = "Content-Type: text/plain; charset=";
 431     const size_t len = strlen(prefix);
 432
 433     size_t n, count = file.GetLineCount();
 434     for ( n = 0; n < count; n++ )
 435     {
 436         wxString line = file[n];
 437
 438         if ( !line )
 439         {
 440             // if it is an email message, headers are over, no need to parse
 441             // all the file
 442             break;
 443         }
 444
 445         if ( line.Left(len) == prefix )
 446         {
 447             // found!
 448             const char *pc = line.c_str() + len;
 449             if ( *pc == '"' )
 450                 pc++;
 451
 452             while ( *pc && *pc != '"' )
 453             {
 454                 charset += *pc++;
 455             }
 456
 457             break;
 458         }
 459     }
 460
 461     if ( !charset )
 462     {
 463         wxLogError("The file '%s' doesn't contain charset information.",
 464                    filename.c_str());
 465
 466         return;
 467     }
 468
 469     // ok, now get the corresponding encoding
 470     wxFontEncoding fontenc = wxTheFontMapper->CharsetToEncoding(charset);
 471     if ( fontenc == wxFONTENCODING_SYSTEM )
 472     {
 473         wxLogError("Charset '%s' is unsupported.", charset.c_str());
 474         return;
 475     }
 476
 477     // and now create the correct font
 478     if ( !DoEnumerateFamilies(FALSE, fontenc, TRUE /* silent */) )
 479     {
 480         wxFont font(14, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
 481                     wxFONTWEIGHT_NORMAL, FALSE /* !underlined */,
 482                     wxEmptyString /* facename */, fontenc);
 483         if ( font.Ok() )
 484         {
 485             DoChangeFont(font);
 486         }
 487         else
 488         {
 489             wxLogWarning("No fonts for encoding '%s' on this system.",
 490                          wxFontMapper::GetEncodingDescription(fontenc).c_str());
 491         }
 492     }
 493
 494     m_textctrl->LoadFile(filename);
 495 }
 496
 497 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 498 {
 499     wxMessageBox("wxWindows font demo\n"
 500                  "(c) 1999 Vadim Zeitlin",
 501                  "About Font",
 502                  wxOK | wxICON_INFORMATION, this);
 503 }
 504
 505 void MyFrame::OnSize(wxSizeEvent& event)
 506 {
 507     wxSize size = event.GetSize();
 508
 509     Resize(size);
 510
 511     event.Skip();
 512 }
 513
 514 void MyFrame::Resize(const wxSize& size, const wxFont& font)
 515 {
 516     if ( !m_textctrl )
 517         return;
 518
 519     wxCoord h;
 520     if ( font.Ok() )
 521     {
 522         wxClientDC dc(this);
 523         dc.SetFont(font);
 524
 525         h = 10*(dc.GetCharHeight() + 1);
 526     }
 527     else
 528     {
 529         h = m_textctrl->GetSize().y;
 530     }
 531
 532     m_textctrl->SetSize(0, 0, size.x, h);
 533     m_canvas->SetSize(0, h, size.x, size.y - h);
 534 }
 535
 536 // ----------------------------------------------------------------------------
 537 // MyCanvas
 538 // ----------------------------------------------------------------------------
 539
 540 BEGIN_EVENT_TABLE(MyCanvas, wxWindow)
 541     EVT_PAINT(MyCanvas::OnPaint)
 542 END_EVENT_TABLE()
 543
 544 MyCanvas::MyCanvas( wxWindow *parent )
 545         : wxWindow( parent, -1 ),
 546           m_colour(*wxRED), m_font(*wxNORMAL_FONT)
 547 {
 548 }
 549
 550 MyCanvas::~MyCanvas()
 551 {
 552 }
 553
 554 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 555 {
 556     wxPaintDC dc(this);
 557     PrepareDC(dc);
 558
 559     // set background
 560     dc.SetBackground(wxBrush("white", wxSOLID));
 561     dc.Clear();
 562
 563     // output the font name/info
 564     wxString fontInfo;
 565     fontInfo.Printf("Font family is '%s', style '%s', weight '%s'",
 566                     m_font.GetFamilyString().c_str(),
 567                     m_font.GetStyleString().c_str(),
 568                     m_font.GetWeightString().c_str());
 569
 570     dc.DrawText(fontInfo, 5, 5);
 571
 572     // prepare to draw the font
 573     dc.SetFont(m_font);
 574     dc.SetTextForeground(m_colour);
 575
 576     // the size of one cell (char + small margin)
 577     int w = dc.GetCharWidth() + 5,
 578         h = dc.GetCharHeight() + 4;
 579
 580     // the origin for our table
 581     int x = 5,
 582         y = 2*h;
 583
 584     // print all font symbols from 32 to 256 in 7 rows of 32 chars each
 585     for ( int i = 1; i < 8; i++ )
 586     {
 587         for ( int j = 0; j < 32; j++ )
 588         {
 589             dc.DrawText(char(32*i + j), x + w*j, y + h*i);
 590         }
 591     }
 592
 593     // draw the lines between them
 594     dc.SetPen(wxPen(wxColour("blue"), 1, wxSOLID));
 595     int l;
 596
 597     // horizontal
 598     y += h;
 599     for ( l = 0; l < 8; l++ )
 600     {
 601         int yl = y + h*l - 2;
 602         dc.DrawLine(x - 2, yl, x + 32*w - 2, yl);
 603     }
 604
 605     // and vertical
 606     for ( l = 0; l < 33; l++ )
 607     {
 608         int xl = x + w*l - 2;
 609         dc.DrawLine(xl, y, xl, y + 7*h - 2);
 610     }
 611 }