samples/wxpoem/wxpoem.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wxpoem.cpp
   3 // Purpose:     A small C++ program which displays a random poem on
   4 //              execution. It also allows search for poems containing a
   5 //              string.
   6 //              It requires winpoem.dat and creates winpoem.idx.
   7 //              Original version (WinPoem) written in 1994.
   8 //              This has not been rewritten in a long time so
   9 //              beware, inelegant code!
  10 // Author:      Julian Smart
  11 // Created:     12/12/98
  12 // RCS-ID:      $Id$
  13 // Copyright:   (c) 1998 Julian Smart
  14 // Licence:     wxWindows licence
  15 /////////////////////////////////////////////////////////////////////////////
  16
  17 #ifdef __GNUG__
  18 #pragma implementation "wxpoem.h"
  19 #endif
  20
  21 // For compilers that support precompilation, includes "wx.h".
  22 #include "wx/wxprec.h"
  23
  24 #ifdef __BORLANDC__
  25 #pragma hdrstop
  26 #endif
  27
  28 #ifndef WX_PRECOMP
  29 #include "wx/wx.h"
  30 #endif
  31
  32 #include "wx/help.h"
  33
  34 #include "wxpoem.h"
  35
  36 #if defined(__WXGTK__) || defined(__WXMOTIF__)
  37 #include "corner1.xpm"
  38 #include "corner2.xpm"
  39 #include "corner3.xpm"
  40 #include "corner4.xpm"
  41 #endif
  42
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <time.h>
  47
  48 #ifdef __WINDOWS__
  49 #include <windows.h>
  50 #ifdef DrawText
  51 #undef DrawText
  52 #endif
  53 #endif
  54
  55 #define         buf_size 10000
  56 #define         DEFAULT_POETRY_DAT "wxpoem"
  57 #define         DEFAULT_POETRY_IND "wxpoem"
  58 #define         DEFAULT_CHAR_HEIGHT 18
  59 #define         DEFAULT_FONT "Swiss"
  60 #define         DEFAULT_X_POS 0
  61 #define         DEFAULT_Y_POS 0
  62 #define         BORDER_SIZE 30
  63 #define         THIN_LINE_BORDER 10
  64 #define         THICK_LINE_BORDER 16
  65 #define         THICK_LINE_WIDTH 2
  66 #define         SHADOW_OFFSET 1
  67 #define         X_SIZE 30
  68 #define         Y_SIZE 20
  69
  70 static char     *poem_buffer;          // Storage for each poem
  71 static char     line[150];                      // Storage for a line
  72 static char     title[150];                     // Remember the title
  73 static char     *search_string = NULL;          // The search string
  74 static int      pages[30];                      // For multipage poems -
  75                                                 // store the start of each page
  76 static long     last_poem_start = 0;            // Start of last found poem
  77 static long     last_find = -1;                 // Point in file of last found
  78                                                 // search string
  79 static bool     search_ok = FALSE;              // Search was successful
  80 static bool     same_search = FALSE;            // Searching on same string
  81
  82 static long     poem_index[600];                     // Index of poem starts
  83 static long     nitems = 0;                     // Number of poems
  84 static int      char_height = DEFAULT_CHAR_HEIGHT; // Actual height
  85 static int      index_ptr = -1;                 // Pointer into index
  86 static int      poem_height, poem_width;        // Size of poem
  87 static int      XPos;                           // Startup X position
  88 static int      YPos;                           // Startup Y position
  89 static int      pointSize = 12;                 // Font size
  90
  91 static char     *index_filename = NULL;            // Index filename
  92 static char     *data_filename = NULL;             // Data filename
  93 static char     error_buf[300];                 // Error message buffer
  94 static bool     loaded_ok = FALSE;              // Poem loaded ok
  95 static bool     index_ok = FALSE;               // Index loaded ok
  96
  97 static bool     paging = FALSE;                 // Are we paging?
  98 static int      current_page = 0;               // Currently viewed page
  99
 100 wxIcon          *Corner1 = NULL;
 101 wxIcon          *Corner2 = NULL;
 102 wxIcon          *Corner3 = NULL;
 103 wxIcon          *Corner4 = NULL;
 104
 105 // Fonts
 106 wxFont          *NormalFont = NULL;
 107 wxFont          *BoldFont = NULL;
 108 wxFont          *ItalicFont = NULL;
 109
 110 // Pens
 111 wxPen           *GreyPen = NULL;
 112 wxPen           *DarkGreyPen = NULL;
 113 wxPen           *WhitePen = NULL;
 114
 115 // Backing bitmap
 116 wxBitmap        *backingBitmap = NULL;
 117
 118 void            PoetryError(char *, char *caption="wxPoem Error");
 119 void            PoetryNotify(char *Msg, char *caption="wxPoem");
 120 void            TryLoadIndex();
 121 bool            LoadPoem(char *, long);
 122 int             GetIndex();
 123 int             LoadIndex(char *);
 124 bool            Compile(void);
 125 void            WritePreferences();
 126 void            ReadPreferences();
 127 void            FindMax(int *max_thing, int thing);
 128 void            CreateFonts();
 129 #ifdef __WXMSW__
 130 void            CopyToClipboard(HWND, char *);
 131 #endif
 132
 133 wxMenu    *popupMenu = NULL;
 134
 135 #if wxUSE_HELP
 136     wxHelpController *HelpController = NULL;
 137 #endif // wxUSE_HELP
 138
 139 IMPLEMENT_APP(MyApp)
 140
 141 MainWindow *TheMainWindow = NULL;
 142
 143 // Create the fonts
 144 void CreateFonts()
 145 {
 146   NormalFont = wxTheFontList->FindOrCreateFont(pointSize, wxSWISS, wxNORMAL, wxNORMAL);
 147   BoldFont =   wxTheFontList->FindOrCreateFont(pointSize, wxSWISS, wxNORMAL, wxBOLD);
 148   ItalicFont = wxTheFontList->FindOrCreateFont(pointSize, wxSWISS, wxITALIC, wxNORMAL);
 149 }
 150
 151 BEGIN_EVENT_TABLE(MainWindow, wxFrame)
 152     EVT_CLOSE(MainWindow::OnCloseWindow)
 153     EVT_CHAR(MainWindow::OnChar)
 154     EVT_MENU(-1, MainWindow::OnPopup)
 155 END_EVENT_TABLE()
 156
 157 MainWindow::MainWindow(wxFrame *frame, wxWindowID id, const wxString& title,
 158    const wxPoint& pos, const wxSize& size, long style):
 159   wxFrame(frame, id, title, pos, size, style)
 160 {
 161 }
 162
 163 MainWindow::~MainWindow()
 164 {
 165   // Note: this must be done before the main window/canvas are destroyed
 166   // or we get an error (no parent window for menu item button)
 167   delete popupMenu;
 168   popupMenu = NULL;
 169 }
 170
 171 // Read the poetry buffer, either for finding the size
 172 // or for writing to a bitmap (not to the window directly,
 173 // since that displays messily)
 174 // If DrawIt is true, we draw, otherwise we just determine the
 175 // size the window should be.
 176 void MainWindow::ScanBuffer(wxDC *dc, bool DrawIt, int *max_x, int *max_y)
 177 {
 178     int i = pages[current_page];
 179     int ch = -1;
 180     int x = 10;
 181     int y = 0;
 182     int j;
 183     char *line_ptr;
 184     int curr_width = 0;
 185     bool page_break = FALSE;
 186
 187     int width = 0;
 188     int height = 0;
 189
 190     if (DrawIt)
 191     {
 192       y = (*max_y - poem_height)/2;
 193       width = *max_x;
 194       height = *max_y;
 195     }
 196
 197     if (DrawIt && wxColourDisplay())
 198     {
 199       dc->SetBrush(*wxLIGHT_GREY_BRUSH);
 200       dc->SetPen(*GreyPen);
 201       dc->DrawRectangle(0, 0, width, height);
 202       dc->SetBackgroundMode(wxTRANSPARENT);
 203     }
 204
 205     // See what ACTUAL char height is
 206     dc->SetFont(* NormalFont);
 207     long xx;
 208     long yy;
 209     dc->GetTextExtent("X", &xx, &yy);
 210     char_height = (int)yy;
 211
 212     if (current_page == 0)
 213       title[0] = 0;
 214     else if (title[0] != 0)
 215     {
 216        dc->SetFont(* BoldFont);
 217        dc->GetTextExtent(title, &xx, &yy);
 218        FindMax(&curr_width, (int)xx);
 219
 220        if (DrawIt)
 221        {
 222          x = (width - xx)/2;
 223          dc->SetFont(* BoldFont);
 224
 225          // Change text to BLACK!
 226          dc->SetTextForeground(* wxBLACK);
 227          dc->DrawText(title, x, y);
 228          // Change text to WHITE!
 229          dc->SetTextForeground(* wxWHITE);
 230          dc->DrawText(title, x-SHADOW_OFFSET, y-SHADOW_OFFSET);
 231        }
 232        y += char_height;
 233        y += char_height;
 234     }
 235
 236     while (ch != 0 && !page_break)
 237     {
 238         j = 0;
 239 #ifdef __WXMSW__
 240         while (((ch = poem_buffer[i]) != 13) && (ch != 0))
 241 #else
 242         while (((ch = poem_buffer[i]) != 10) && (ch != 0))
 243 #endif
 244         {
 245             line[j] = ch;
 246             j ++;
 247             i ++;
 248         }
 249
 250 #ifdef __WXMSW__
 251         if (ch == 13)
 252 #else
 253         if (ch == 10)
 254 #endif
 255         {
 256             ch = -1;
 257             i ++;
 258 #ifdef __WXMSW__
 259             // Add another to skip the linefeed
 260             i ++;
 261 #endif
 262             // If a single newline on its own, put a space in
 263             if (j == 0)
 264             {
 265               line[j] = ' ';
 266               j ++;
 267               line[j] = 0;
 268             }
 269         }
 270
 271         if (j > 0)
 272         {
 273           line[j] = 0;
 274           if (line[0] == '@')
 275           {
 276             switch (line[1])
 277             {
 278               case 'P':
 279                 paging = TRUE;
 280                 page_break = TRUE;
 281                 break;
 282
 283               case 'T':
 284                 dc->SetFont(* BoldFont);
 285                 line_ptr = line+3;
 286
 287                 strcpy(title, line_ptr);
 288                 strcat(title, " (cont'd)");
 289
 290                 dc->GetTextExtent(line_ptr, &xx, &yy);
 291                 FindMax(&curr_width, (int)xx);
 292
 293                 if (DrawIt)
 294                 {
 295                   x = (width - xx)/2;
 296                   dc->SetFont(* BoldFont);
 297
 298                   // Change text to BLACK!
 299                   dc->SetTextForeground(* wxBLACK);
 300                   dc->DrawText(line_ptr, x, y);
 301
 302                   // Change text to WHITE!
 303                   dc->SetTextForeground(* wxWHITE);
 304                   dc->DrawText(line_ptr, x-SHADOW_OFFSET, y-SHADOW_OFFSET);
 305                   dc->SetTextForeground(* wxWHITE);
 306                 }
 307                 break;
 308
 309               case 'A':
 310                 line_ptr = line+3;
 311                 dc->SetFont(* ItalicFont);
 312
 313                 dc->GetTextExtent(line_ptr, &xx, &yy);
 314                 FindMax(&curr_width, (int)xx);
 315
 316                 if (DrawIt)
 317                 {
 318                   x = (width - xx)/2;
 319                   dc->SetTextForeground(* wxBLACK);
 320                   dc->DrawText(line_ptr, x, y);
 321                 }
 322                 break;
 323
 324               // Default: just ignore this line
 325               default:
 326                 y -= char_height;
 327             }
 328            }
 329            else
 330            {
 331               dc->SetFont(* NormalFont);
 332
 333               dc->GetTextExtent(line, &xx, &yy);
 334               FindMax(&curr_width, (int)xx);
 335
 336               if (DrawIt)
 337               {
 338                 int x = (int)((width - xx)/2.0);
 339                 dc->SetFont(* NormalFont);
 340                 dc->SetTextForeground(* wxBLACK);
 341                 dc->DrawText(line, x, y);
 342               }
 343            }
 344         }
 345         y += char_height;
 346     }
 347
 348     // Write (cont'd)
 349     if (page_break)
 350     {
 351        char *cont = "(cont'd)";
 352
 353        dc->SetFont(* NormalFont);
 354
 355        dc->GetTextExtent(cont, &xx, &yy);
 356        FindMax(&curr_width, (int)xx);
 357        if (DrawIt)
 358        {
 359          int x = (int)((width - xx)/2.0);
 360          dc->SetFont(* NormalFont);
 361          dc->SetTextForeground(* wxBLACK);
 362          dc->DrawText(cont, x, y);
 363        }
 364        y += 2*char_height;
 365     }
 366
 367     *max_x = (int)curr_width;
 368     *max_y = (int)(y-char_height);
 369
 370     if (page_break)
 371       pages[current_page+1] = i;
 372     else
 373       paging = FALSE;
 374
 375     if (DrawIt)
 376     {
 377       // Draw dark grey thick border
 378       if (wxColourDisplay())
 379       {
 380         dc->SetBrush(*wxGREY_BRUSH);
 381         dc->SetPen(*wxGREY_PEN);
 382
 383         // Left side
 384         dc->DrawRectangle(0, 0, THIN_LINE_BORDER, height);
 385         // Top side
 386         dc->DrawRectangle(THIN_LINE_BORDER, 0, width-THIN_LINE_BORDER, THIN_LINE_BORDER);
 387         // Right side
 388         dc->DrawRectangle(width-THIN_LINE_BORDER, THIN_LINE_BORDER, width, height-THIN_LINE_BORDER);
 389         // Bottom side
 390         dc->DrawRectangle(THIN_LINE_BORDER, height-THIN_LINE_BORDER, width-THIN_LINE_BORDER, height);
 391       }
 392       // Draw border
 393       // Have grey background, plus 3-d border -
 394       // One black rectangle.
 395       // Inside this, left and top sides - dark grey. Bottom and right -
 396       // white.
 397
 398       // Change pen to black
 399       dc->SetPen(*wxBLACK_PEN);
 400       dc->DrawLine(THIN_LINE_BORDER, THIN_LINE_BORDER, width-THIN_LINE_BORDER, THIN_LINE_BORDER);
 401       dc->DrawLine(width-THIN_LINE_BORDER, THIN_LINE_BORDER, width-THIN_LINE_BORDER, height-THIN_LINE_BORDER);
 402       dc->DrawLine(width-THIN_LINE_BORDER, height-THIN_LINE_BORDER, THIN_LINE_BORDER, height-THIN_LINE_BORDER);
 403       dc->DrawLine(THIN_LINE_BORDER, height-THIN_LINE_BORDER, THIN_LINE_BORDER, THIN_LINE_BORDER);
 404
 405       // Right and bottom white lines - 'grey' (black!) if
 406       // we're running on a mono display.
 407       if (wxColourDisplay())
 408         dc->SetPen(*WhitePen);
 409       else
 410         dc->SetPen(*DarkGreyPen);
 411
 412       dc->DrawLine(width-THICK_LINE_BORDER, THICK_LINE_BORDER,
 413                    width-THICK_LINE_BORDER, height-THICK_LINE_BORDER);
 414       dc->DrawLine(width-THICK_LINE_BORDER, height-THICK_LINE_BORDER,
 415                    THICK_LINE_BORDER, height-THICK_LINE_BORDER);
 416
 417       // Left and top grey lines
 418       dc->SetPen(*DarkGreyPen);
 419       dc->DrawLine(THICK_LINE_BORDER, height-THICK_LINE_BORDER,
 420                    THICK_LINE_BORDER, THICK_LINE_BORDER);
 421       dc->DrawLine(THICK_LINE_BORDER, THICK_LINE_BORDER,
 422                    width-THICK_LINE_BORDER, THICK_LINE_BORDER);
 423
 424 //#ifdef __WXMSW__
 425       // Draw icons
 426       dc->DrawIcon(* Corner1, 0, 0);
 427       dc->DrawIcon(* Corner2, int(width-32), 0);
 428
 429       int y2 = height - 32;
 430       int x2 = (width-32);
 431       dc->DrawIcon(* Corner3, 0, y2);
 432       dc->DrawIcon(* Corner4, x2, y2);
 433 //#endif
 434     }
 435 }
 436
 437 // Get an index (randomly generated) and load the poem
 438 void MainWindow::GetIndexLoadPoem(void)
 439 {
 440     if (index_ok)
 441       index_ptr = GetIndex();
 442
 443     if (index_ptr > -1)
 444       loaded_ok = LoadPoem(data_filename, -1);
 445 }
 446
 447 // Find the size of the poem and resize the window accordingly
 448 void MainWindow::Resize(void)
 449 {
 450     wxClientDC dc(canvas);
 451
 452     // Get the poem size
 453     ScanBuffer(& dc, FALSE, &poem_width, &poem_height);
 454     int x = poem_width + (2*BORDER_SIZE);
 455     int y = poem_height + (2*BORDER_SIZE);
 456
 457     SetClientSize(x, y);
 458
 459     // In case client size isn't what we set it to...
 460     int xx, yy;
 461     GetClientSize(&xx, &yy);
 462
 463     wxMemoryDC memDC;
 464     if (backingBitmap) delete backingBitmap;
 465     backingBitmap = new wxBitmap(x, yy);
 466     memDC.SelectObject(* backingBitmap);
 467
 468     memDC.Clear();
 469     TheMainWindow->ScanBuffer(&memDC, TRUE, &xx, &yy);
 470 }
 471
 472 // Which is more?
 473 void FindMax(int *max_thing, int thing)
 474 {
 475   if (thing > *max_thing)
 476     *max_thing = thing;
 477 }
 478
 479 // Next page/poem
 480 void MainWindow::NextPage(void)
 481 {
 482   if (paging)
 483     current_page ++;
 484   else
 485   {
 486     current_page = 0;
 487     GetIndexLoadPoem();
 488   }
 489   Resize();
 490 }
 491
 492 // Previous page
 493 void MainWindow::PreviousPage(void)
 494 {
 495   if (current_page > 0)
 496   {
 497     current_page --;
 498     Resize();
 499   }
 500 }
 501
 502 // Search for a string
 503 void MainWindow::Search(bool ask)
 504 {
 505   long position;
 506
 507   if (ask || !search_string)
 508   {
 509     wxString s = wxGetTextFromUser("Enter search string", "Search", (const char*) search_string);
 510     if (s != "")
 511     {
 512       if (search_string) delete[] search_string;
 513       search_string = copystring(s);
 514       search_ok = TRUE;
 515     } else search_ok = FALSE;
 516   }
 517   else
 518   {
 519     same_search = TRUE;
 520     search_ok = TRUE;
 521   }
 522
 523   if (search_string && search_ok)
 524   {
 525     position = DoSearch();
 526     if (position > -1)
 527     {
 528        loaded_ok = LoadPoem(data_filename, position);
 529        Resize();
 530     }
 531     else
 532     {
 533       last_poem_start = 0;
 534       PoetryNotify("Search string not found.");
 535     }
 536   }
 537 }
 538
 539 // Copy a string to the clipboard
 540 #ifdef __WXMSW__
 541 void CopyToClipboard(HWND handle, char *s)
 542 {
 543   int length = strlen(s);
 544   HANDLE hGlobalMemory = GlobalAlloc(GHND, (DWORD) length + 1);
 545   if (hGlobalMemory)
 546   {
 547 #ifdef __WINDOWS_386__
 548     LPSTR lpGlobalMemory = MK_FP32(GlobalLock(hGlobalMemory));
 549 #else
 550     LPSTR lpGlobalMemory = (LPSTR)GlobalLock(hGlobalMemory);
 551 #endif
 552     int i, j = 0;
 553     for (i = 0; i < length; i ++)
 554     {
 555       if (s[i] == '@')
 556       {
 557         i++;
 558         switch (s[i])
 559         {
 560           case 'P':
 561             break;
 562           case 'T':
 563           case 'A':
 564           default:
 565             i ++;
 566             break;
 567         }
 568       }
 569       else
 570       {
 571         lpGlobalMemory[j] = s[i];
 572         j ++;
 573       }
 574     }
 575
 576     GlobalUnlock(hGlobalMemory);
 577     OpenClipboard(handle);
 578     EmptyClipboard();
 579     SetClipboardData(CF_TEXT, hGlobalMemory);
 580     CloseClipboard();
 581   }
 582 }
 583 #endif
 584
 585 bool MyApp::OnInit()
 586 {
 587   poem_buffer = new char[buf_size];
 588
 589   GreyPen = new wxPen("LIGHT GREY", THICK_LINE_WIDTH, wxSOLID);
 590   DarkGreyPen = new wxPen("GREY", THICK_LINE_WIDTH, wxSOLID);
 591   WhitePen = new wxPen("WHITE", THICK_LINE_WIDTH, wxSOLID);
 592
 593 #if wxUSE_HELP
 594   HelpController = new wxHelpController();
 595   HelpController->Initialize("wxpoem");
 596 #endif // wxUSE_HELP
 597
 598   CreateFonts();
 599
 600   ReadPreferences();
 601
 602   // Seed the random number generator
 603   time_t current_time;
 604
 605   (void)time(&current_time);
 606   srand((unsigned int)current_time);
 607
 608 //    randomize();
 609   pages[0] = 0;
 610
 611   TheMainWindow = new MainWindow(NULL, 500, "wxPoem", wxPoint(XPos, YPos), wxSize(100, 100), wxCAPTION|wxMINIMIZE_BOX|wxSYSTEM_MENU);
 612
 613 #ifdef wx_x
 614   TheMainWindow->SetIcon(Icon("wxpoem"));
 615 #endif
 616
 617   TheMainWindow->canvas = new MyCanvas(TheMainWindow, 501, wxDefaultPosition, wxDefaultSize);
 618
 619   popupMenu = new wxMenu;
 620   popupMenu->Append(POEM_NEXT, "Next poem/page");
 621   popupMenu->Append(POEM_PREVIOUS, "Previous page");
 622   popupMenu->AppendSeparator();
 623   popupMenu->Append(POEM_SEARCH, "Search");
 624   popupMenu->Append(POEM_NEXT_MATCH, "Next match");
 625   popupMenu->Append(POEM_COPY, "Copy to clipboard");
 626   popupMenu->Append(POEM_MINIMIZE, "Minimize");
 627   popupMenu->AppendSeparator();
 628   popupMenu->Append(POEM_BIGGER_TEXT, "Bigger text");
 629   popupMenu->Append(POEM_SMALLER_TEXT, "Smaller text");
 630   popupMenu->AppendSeparator();
 631   popupMenu->Append(POEM_ABOUT, "About wxPoem");
 632   popupMenu->AppendSeparator();
 633   popupMenu->Append(POEM_EXIT, "Exit");
 634
 635   if (argc > 1)
 636   {
 637     index_filename = copystring(argv[1]);
 638     data_filename = copystring(argv[1]);
 639   }
 640   else
 641   {
 642     index_filename = DEFAULT_POETRY_IND;
 643     data_filename = DEFAULT_POETRY_DAT;
 644   }
 645   TryLoadIndex();
 646
 647 #ifdef __WXMSW__
 648   Corner1 = new wxIcon("icon_1");
 649   Corner2 = new wxIcon("icon_2");
 650   Corner3 = new wxIcon("icon_3");
 651   Corner4 = new wxIcon("icon_4");
 652 #endif
 653 #if defined(__WXGTK__) || defined(__WXMOTIF__)
 654   Corner1 = new wxIcon( corner1_xpm );
 655   Corner2 = new wxIcon( corner2_xpm );
 656   Corner3 = new wxIcon( corner3_xpm );
 657   Corner4 = new wxIcon( corner4_xpm );
 658 #endif
 659
 660   TheMainWindow->GetIndexLoadPoem();
 661   TheMainWindow->Resize();
 662   TheMainWindow->Show(TRUE);
 663
 664   return TRUE;
 665 }
 666
 667 int MyApp::OnExit()
 668 {
 669   if (backingBitmap)
 670     delete backingBitmap;
 671 #if wxUSE_HELP
 672   delete HelpController;
 673 #endif // wxUSE_HELP
 674   delete GreyPen;
 675   delete DarkGreyPen;
 676   delete WhitePen;
 677
 678   delete Corner1;
 679   delete Corner2;
 680   delete Corner3;
 681   delete Corner4;
 682
 683   delete NormalFont;
 684   delete BoldFont;
 685   delete ItalicFont;
 686   delete poem_buffer;
 687
 688   return 0;
 689 }
 690
 691 void MainWindow::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
 692 {
 693   WritePreferences();
 694   this->Destroy();
 695 }
 696
 697 void MainWindow::OnChar(wxKeyEvent& event)
 698 {
 699     canvas->OnChar(event);
 700 }
 701
 702 BEGIN_EVENT_TABLE(MyCanvas, wxWindow)
 703     EVT_MOUSE_EVENTS(MyCanvas::OnMouseEvent)
 704     EVT_CHAR(MyCanvas::OnChar)
 705     EVT_PAINT(MyCanvas::OnPaint)
 706 END_EVENT_TABLE()
 707
 708 // Define a constructor for my canvas
 709 MyCanvas::MyCanvas(wxFrame *frame, wxWindowID id, const wxPoint& pos, const wxSize& size):
 710  wxWindow(frame, id, pos, size)
 711 {
 712 }
 713
 714 // Define the repainting behaviour
 715 void MyCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
 716 {
 717     wxPaintDC dc(this);
 718
 719     if (backingBitmap)
 720     {
 721         int xx, yy;
 722         TheMainWindow->GetClientSize(&xx, &yy);
 723
 724         wxMemoryDC memDC;
 725         memDC.SelectObject(* backingBitmap);
 726         dc.Blit(0, 0, backingBitmap->GetWidth(), backingBitmap->GetHeight(), &memDC, 0, 0);
 727   }
 728 }
 729
 730 void MyCanvas::OnMouseEvent(wxMouseEvent& event)
 731 {
 732   static int startPosX, startPosY, startFrameX, startFrameY;
 733
 734   long x, y;
 735   event.GetPosition(&x, &y);
 736
 737   if (event.RightDown())
 738   {
 739     // Versions from wxWin 1.67 are probably OK
 740     PopupMenu(popupMenu, (int)x, (int)y );
 741   }
 742   else if (event.LeftDown())
 743   {
 744     this->CaptureMouse();
 745     int x1 = (int)x;
 746     int y1 = (int)y;
 747     ClientToScreen(&x1, &y1);
 748     startPosX = x1;
 749     startPosY = y1;
 750     GetParent()->GetPosition(&startFrameX, &startFrameY);
 751   }
 752   else if (event.LeftUp())
 753     this->ReleaseMouse();
 754   else if (event.Dragging() && event.LeftIsDown())
 755   {
 756     int x1 = (int)x;
 757     int y1 = (int)y;
 758     ClientToScreen(&x1, &y1);
 759
 760     int dX = x1 - startPosX;
 761     int dY = y1 - startPosY;
 762     GetParent()->Move(startFrameX + dX, startFrameY + dY);
 763   }
 764 }
 765
 766 // Process characters
 767 void MyCanvas::OnChar(wxKeyEvent& event)
 768 {
 769   switch (event.KeyCode())
 770   {
 771     case 'n':
 772     case 'N':
 773       // Next match
 774       TheMainWindow->Search(FALSE);
 775       break;
 776     case 's':
 777     case 'S':
 778       // New search
 779       TheMainWindow->Search(TRUE);
 780       break;
 781     case WXK_SPACE:
 782       // Another poem
 783       TheMainWindow->NextPage();
 784       break;
 785     case 27:
 786       TheMainWindow->Close(TRUE);
 787     default:
 788        break;
 789    }
 790  }
 791
 792 // Load index file
 793 int LoadIndex(char *file_name)
 794 {
 795     long data;
 796     FILE *index_file;
 797
 798     int i = 0;
 799     char buf[100];
 800
 801     if (file_name)
 802       sprintf(buf, "%s.idx", file_name);
 803     if (! (file_name && (index_file = fopen(buf, "r"))))
 804       return 0;
 805     else
 806     {
 807       fscanf(index_file, "%ld", &nitems);
 808
 809       for (i = 0; i < nitems; i++)
 810       {
 811         fscanf(index_file, "%ld", &data);
 812         poem_index[i] = data;
 813       }
 814       fclose(index_file);
 815
 816       return 1;
 817     }
 818 }
 819
 820 // Get index
 821 int GetIndex()
 822 {
 823     int indexn = 0;
 824
 825     indexn = (int)(rand() % nitems);
 826
 827     if ((indexn < 0) || (indexn > nitems))
 828     { PoetryError("No such poem!");
 829       return -1;
 830     }
 831     else
 832       return indexn;
 833 }
 834
 835 // Read preferences
 836 void ReadPreferences()
 837 {
 838   wxGetResource("wxPoem", "FontSize", &pointSize);
 839   wxGetResource("wxPoem", "X", &XPos);
 840   wxGetResource("wxPoem", "Y", &YPos);
 841 }
 842
 843 // Write preferences to disk
 844 void WritePreferences()
 845 {
 846 #ifdef __WXMSW__
 847   TheMainWindow->GetPosition(&XPos, &YPos);
 848   wxWriteResource("wxPoem", "FontSize", pointSize);
 849   wxWriteResource("wxPoem", "X", XPos);
 850   wxWriteResource("wxPoem", "Y", YPos);
 851 #endif
 852 }
 853
 854 // Load a poem from given file, at given point in file.
 855 // If position is > -1, use this for the position in the
 856 // file, otherwise use index[index_ptr] to find the correct position.
 857 bool LoadPoem(char *file_name, long position)
 858 {
 859     int ch = 0;
 860     int i = 0;
 861 //    int j = 0;
 862 //    int indexn = 0;
 863     char buf[100];
 864     long data;
 865     FILE *data_file;
 866
 867     paging = FALSE;
 868     current_page = 0;
 869
 870     if (file_name)
 871       sprintf(buf, "%s.dat", file_name);
 872
 873     if (! (file_name && (data_file = fopen(buf, "r"))))
 874     {
 875       sprintf(error_buf, "Data file %s not found.", buf);
 876       PoetryError(error_buf);
 877       return FALSE;
 878     }
 879     else
 880     {
 881       if (position > -1)
 882         data = position;
 883       else
 884         data = poem_index[index_ptr];
 885
 886       fseek(data_file, data, SEEK_SET);
 887
 888       ch = 0;
 889       i = 0;
 890       while ((ch != EOF) && (ch != '#'))
 891       {
 892         ch = getc(data_file);
 893         // Add a linefeed so it will copy to the clipboard ok
 894         if (ch == 10)
 895         {
 896           poem_buffer[i] = 13;
 897           i++;
 898         }
 899
 900         poem_buffer[i] = ch;
 901         i ++;
 902
 903         if (i == buf_size)
 904         {
 905            sprintf(error_buf, "%s", "Poetry buffer exceeded.");
 906            PoetryError(error_buf);
 907            return FALSE;
 908         }
 909       }
 910       fclose(data_file);
 911       poem_buffer[i-1] = 0;
 912       return TRUE;
 913   }
 914 }
 915
 916 // Do the search
 917 long MainWindow::DoSearch(void)
 918 {
 919     if (!search_string)
 920       return FALSE;
 921
 922     FILE *file;
 923     long i = 0;
 924     int ch = 0;
 925     char buf[100];
 926     long find_start;
 927     long previous_poem_start;
 928
 929     bool found = FALSE;
 930     int search_length = strlen(search_string);
 931
 932     if (same_search)
 933     {
 934       find_start = last_find + 1;
 935       previous_poem_start = last_poem_start;
 936     }
 937     else
 938     {
 939       find_start = 0;
 940       last_poem_start = 0;
 941       previous_poem_start = -1;
 942     }
 943
 944     if (data_filename)
 945       sprintf(buf, "%s.dat", data_filename);
 946
 947     if (! (data_filename && (file = fopen(buf, "r"))))
 948     {
 949       sprintf(error_buf, "Poetry data file %s not found\n", buf);
 950       PoetryError(error_buf);
 951       return FALSE;
 952     }
 953
 954     fseek(file, find_start, SEEK_SET);
 955
 956     while ((ch != EOF) && !found)
 957     {
 958         ch = getc(file);
 959         ch |= 0x0020;   // Make lower case
 960
 961         // Only match if we're looking at a different poem
 962         // (no point in displaying the same poem again)
 963         if ((ch == search_string[i]) && (last_poem_start != previous_poem_start))
 964         {
 965           if (i == 0)
 966             last_find = ftell(file);
 967           if (i == search_length-1)
 968             found = TRUE;
 969           i ++;
 970         }
 971         else
 972           i = 0;
 973
 974         if (ch == '#')
 975         {
 976             ch = getc(file);
 977               last_poem_start = ftell(file);
 978         }
 979     }
 980     fclose(file);
 981     if (ch == EOF)
 982       last_find = -1;
 983
 984     if (found)
 985     {
 986       return last_poem_start;
 987     }
 988     else
 989       return -1;
 990 }
 991
 992 // Set up poetry filenames, preferences, load the index
 993 // Load index (or compile it if none found)
 994 void TryLoadIndex()
 995 {
 996   index_ok = LoadIndex(index_filename);
 997   if (!index_ok || (nitems == 0))
 998   {
 999       PoetryError("Index file not found; will compile new one", "wxPoem");
1000       index_ok = Compile();
1001   }
1002 }
1003
1004 // Error message
1005 void PoetryError(char *msg, char *caption)
1006 {
1007   wxMessageBox(msg, caption, wxOK|wxICON_EXCLAMATION);
1008 }
1009
1010 // Notification (change icon to something appropriate!)
1011 void PoetryNotify(char *Msg, char *caption)
1012 {
1013   wxMessageBox(Msg, caption, wxOK | wxICON_INFORMATION);
1014 }
1015
1016 // Build up and save an index into the poetry data file, for
1017 // rapid random access
1018 bool Compile(void)
1019 {
1020     FILE *file;
1021     long i = 0;
1022     int j;
1023     int ch = 0;
1024     char buf[100];
1025
1026     if (data_filename)
1027       sprintf(buf, "%s.dat", data_filename);
1028
1029     if (! (data_filename && (file = fopen(buf, "r"))))
1030     {
1031       sprintf(error_buf, "Poetry data file %s not found\n", buf);
1032       PoetryError(error_buf);
1033       return FALSE;
1034     }
1035
1036     nitems = 0;
1037
1038     // Do first one (?)
1039     poem_index[nitems] = 0;
1040     nitems ++;
1041
1042     // Do rest
1043     while (ch != EOF)
1044     {
1045         ch = getc(file);
1046         i ++;
1047         if (ch == '#')
1048         {
1049             ch = getc(file);
1050             long data;
1051             data = ftell(file);
1052             poem_index[nitems] = data;
1053             nitems ++;
1054         }
1055     }
1056     fclose(file);
1057
1058     if (index_filename)
1059       sprintf(buf, "%s.idx", index_filename);
1060     if (! (data_filename && (file = fopen(buf, "w"))))
1061     {
1062       sprintf(error_buf, "Poetry index file %s cannot be created\n", buf);
1063       PoetryError(error_buf);
1064       return FALSE;
1065     }
1066
1067     fprintf(file, "%ld\n\n", nitems);
1068     for (j = 0; j < nitems; j++)
1069       fprintf(file, "%ld\n", poem_index[j]);
1070
1071     fclose(file);
1072     PoetryNotify("Poetry index compiled.");
1073     return TRUE;
1074 }
1075
1076 void MainWindow::OnPopup(wxCommandEvent& event)
1077 {
1078   switch (event.GetId())
1079   {
1080      case POEM_NEXT:
1081        // Another poem/page
1082        TheMainWindow->NextPage();
1083        break;
1084      case POEM_PREVIOUS:
1085        // Previous page
1086        TheMainWindow->PreviousPage();
1087        break;
1088      case POEM_SEARCH:
1089        // Search - with dialog
1090        TheMainWindow->Search(TRUE);
1091        break;
1092      case POEM_NEXT_MATCH:
1093        // Search - without dialog (next match)
1094        TheMainWindow->Search(FALSE);
1095        break;
1096      case POEM_MINIMIZE:
1097        TheMainWindow->Iconize(TRUE);
1098        break;
1099 #ifdef __WXMSW__
1100      case POEM_COPY:
1101        // Copy current poem to the clipboard
1102        CopyToClipboard((HWND) TheMainWindow->GetHWND(), poem_buffer);
1103        break;
1104 #endif
1105      case POEM_COMPILE:
1106        // Compile index
1107        Compile();
1108        break;
1109      case POEM_BIGGER_TEXT:
1110      {
1111        pointSize ++;
1112        CreateFonts();
1113        TheMainWindow->Resize();
1114        break;
1115      }
1116      case POEM_SMALLER_TEXT:
1117      {
1118        if (pointSize > 2)
1119        {
1120          pointSize --;
1121          CreateFonts();
1122          TheMainWindow->Resize();
1123        }
1124        break;
1125      }
1126      case POEM_HELP_CONTENTS:
1127      {
1128 #if wxUSE_HELP
1129        HelpController->LoadFile("wxpoem");
1130        HelpController->DisplayContents();
1131 #endif // wxUSE_HELP
1132        break;
1133      }
1134      case POEM_ABOUT:
1135      {
1136        (void)wxMessageBox("wxPoem Version 1.1\nJulian Smart (c) 1995",
1137                           "About wxPoem", wxOK, TheMainWindow);
1138        break;
1139      }
1140      case POEM_EXIT:
1141        // Exit
1142        TheMainWindow->Close(TRUE);
1143        break;
1144      default:
1145        break;
1146   }
1147 }