samples/caret/caret.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        caret.cpp
   3 // Purpose:     wxCaret sample
   4 // Author:      Robert Roebling
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWindows team
   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     #include "wx/log.h"
  24 #endif
  25
  26 #include "wx/caret.h"
  27 #include "wx/numdlg.h"
  28
  29 // ----------------------------------------------------------------------------
  30 // ressources
  31 // ----------------------------------------------------------------------------
  32 // the application icon
  33 #if defined(__WXGTK__) || defined(__WXX11__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__)
  34     #include "mondrian.xpm"
  35 #endif
  36
  37 // ----------------------------------------------------------------------------
  38 // private classes
  39 // ----------------------------------------------------------------------------
  40
  41 // Define a new application type, each program should derive a class from wxApp
  42 class MyApp : public wxApp
  43 {
  44 public:
  45     // override base class virtuals
  46     // ----------------------------
  47
  48     // this one is called on application startup and is a good place for the app
  49     // initialization (doing it here and not in the ctor allows to have an error
  50     // return: if OnInit() returns false, the application terminates)
  51     virtual bool OnInit();
  52 };
  53
  54 // MyCanvas is a canvas on which you can type
  55 class MyCanvas: public wxScrolledWindow
  56 {
  57 public:
  58     MyCanvas() { }
  59     MyCanvas( wxWindow *parent );
  60     ~MyCanvas();
  61
  62     wxChar& CharAt(int x, int y) { return *(m_text + x + m_xChars * y); }
  63
  64     // operations
  65     void SetFontSize(int fontSize);
  66     void CreateCaret();
  67     void MoveCaret(int x, int y);
  68
  69     // caret movement
  70     void Home() { m_xCaret = 0; }
  71     void End() { m_xCaret = m_xChars - 1; }
  72     void FirstLine() { m_yCaret = 0; }
  73     void LastLine() { m_yCaret = m_yChars - 1; }
  74     void PrevChar() { if ( !m_xCaret-- ) { End(); PrevLine(); } }
  75     void NextChar() { if ( ++m_xCaret == m_xChars ) { Home(); NextLine(); } }
  76     void PrevLine() { if ( !m_yCaret-- ) LastLine(); }
  77     void NextLine() { if ( ++m_yCaret == m_yChars ) FirstLine(); }
  78
  79     // event handlers
  80     void OnPaint( wxPaintEvent &event );
  81     void OnSize( wxSizeEvent &event );
  82     void OnChar( wxKeyEvent &event );
  83
  84 private:
  85     // move the caret to m_xCaret, m_yCaret
  86     void DoMoveCaret();
  87
  88     // update the geometry
  89     void ChangeSize();
  90
  91     wxFont   m_font;
  92
  93     // the margin around the text (looks nicer)
  94     int      m_xMargin, m_yMargin;
  95
  96     // size (in pixels) of one character
  97     long     m_widthChar, m_heightChar;
  98
  99     // position (in text coords) of the caret
 100     int      m_xCaret, m_yCaret;
 101
 102     // the size (in text coords) of the window
 103     int      m_xChars, m_yChars;
 104
 105     // the text
 106     wxChar  *m_text;
 107
 108     DECLARE_DYNAMIC_CLASS(MyCanvas)
 109     DECLARE_EVENT_TABLE()
 110 };
 111
 112
 113 // Define a new frame type: this is going to be our main frame
 114 class MyFrame : public wxFrame
 115 {
 116 public:
 117     // ctor(s)
 118     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
 119
 120     // event handlers (these functions should _not_ be virtual)
 121     void OnQuit(wxCommandEvent& event);
 122     void OnAbout(wxCommandEvent& event);
 123     void OnSetBlinkTime(wxCommandEvent& event);
 124     void OnSetFontSize(wxCommandEvent& event);
 125     void OnCaretMove(wxCommandEvent& event);
 126
 127 private:
 128     MyCanvas *m_canvas;
 129
 130     // any class wishing to process wxWidgets events must use this macro
 131     DECLARE_EVENT_TABLE()
 132 };
 133
 134 // ----------------------------------------------------------------------------
 135 // constants
 136 // ----------------------------------------------------------------------------
 137
 138 // IDs for the controls and the menu commands
 139 enum
 140 {
 141     // menu items
 142     Caret_Quit = 1,
 143     Caret_About,
 144     Caret_SetBlinkTime,
 145     Caret_SetFontSize,
 146     Caret_Move,
 147
 148     // controls start here (the numbers are, of course, arbitrary)
 149     Caret_Text = 1000
 150 };
 151
 152 // ----------------------------------------------------------------------------
 153 // event tables and other macros for wxWidgets
 154 // ----------------------------------------------------------------------------
 155
 156 // the event tables connect the wxWidgets events with the functions (event
 157 // handlers) which process them. It can be also done at run-time, but for the
 158 // simple menu events like this the static method is much simpler.
 159 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 160     EVT_MENU(Caret_Quit,  MyFrame::OnQuit)
 161     EVT_MENU(Caret_About, MyFrame::OnAbout)
 162     EVT_MENU(Caret_SetBlinkTime, MyFrame::OnSetBlinkTime)
 163     EVT_MENU(Caret_SetFontSize, MyFrame::OnSetFontSize)
 164     EVT_MENU(Caret_Move, MyFrame::OnCaretMove)
 165 END_EVENT_TABLE()
 166
 167 // Create a new application object: this macro will allow wxWidgets to create
 168 // the application object during program execution (it's better than using a
 169 // static object for many reasons) and also declares the accessor function
 170 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 171 // not wxApp)
 172 IMPLEMENT_APP(MyApp)
 173
 174 // ============================================================================
 175 // implementation
 176 // ============================================================================
 177
 178 // ----------------------------------------------------------------------------
 179 // the application class
 180 // ----------------------------------------------------------------------------
 181
 182 // `Main program' equivalent: the program execution "starts" here
 183 bool MyApp::OnInit()
 184 {
 185     // create and show the main application window
 186     MyFrame *frame = new MyFrame(_T("Caret wxWidgets sample"),
 187                                  wxPoint(50, 50), wxSize(450, 340));
 188
 189     frame->Show(true);
 190
 191     // success: wxApp::OnRun() will be called which will enter the main message
 192     // loop and the application will run. If we returned false here, the
 193     // application would exit immediately.
 194     return true;
 195 }
 196
 197 // ----------------------------------------------------------------------------
 198 // main frame
 199 // ----------------------------------------------------------------------------
 200
 201 // frame constructor
 202 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 203        : wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size)
 204 {
 205     // set the frame icon
 206     SetIcon(wxICON(mondrian));
 207
 208     // create a menu bar
 209     wxMenu *menuFile = new wxMenu;
 210
 211     menuFile->Append(Caret_SetBlinkTime, _T("&Blink time...\tCtrl-B"));
 212     menuFile->Append(Caret_SetFontSize, _T("&Font size...\tCtrl-S"));
 213     menuFile->Append(Caret_Move, _T("&Move caret\tCtrl-C"));
 214     menuFile->AppendSeparator();
 215     menuFile->Append(Caret_About, _T("&About...\tCtrl-A"), _T("Show about dialog"));
 216     menuFile->AppendSeparator();
 217     menuFile->Append(Caret_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
 218
 219     // now append the freshly created menu to the menu bar...
 220     wxMenuBar *menuBar = new wxMenuBar;
 221     menuBar->Append(menuFile, _T("&File"));
 222
 223     // ... and attach this menu bar to the frame
 224     SetMenuBar(menuBar);
 225
 226     m_canvas = new MyCanvas(this);
 227
 228     // create a status bar just for fun (by default with 1 pane only)
 229     CreateStatusBar(2);
 230     SetStatusText(_T("Welcome to wxWidgets!"));
 231 }
 232
 233
 234 // event handlers
 235
 236 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 237 {
 238     // true is to force the frame to close
 239     Close(true);
 240 }
 241
 242 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 243 {
 244     wxMessageBox(_T("The caret wxWidgets sample.\n© 1999 Vadim Zeitlin"),
 245                  _T("About Caret"), wxOK | wxICON_INFORMATION, this);
 246 }
 247
 248 void MyFrame::OnCaretMove(wxCommandEvent& WXUNUSED(event))
 249 {
 250     m_canvas->MoveCaret(10, 10);
 251 }
 252
 253 void MyFrame::OnSetBlinkTime(wxCommandEvent& WXUNUSED(event))
 254 {
 255     long blinkTime = wxGetNumberFromUser
 256                      (
 257                       _T("The caret blink time is the time between two blinks"),
 258                       _T("Time in milliseconds:"),
 259                       _T("wxCaret sample"),
 260                       wxCaret::GetBlinkTime(), 0, 10000,
 261                       this
 262                      );
 263     if ( blinkTime != -1 )
 264     {
 265         wxCaret::SetBlinkTime((int)blinkTime);
 266         m_canvas->CreateCaret();
 267         wxLogStatus(this, _T("Blink time set to %ld milliseconds."), blinkTime);
 268     }
 269 }
 270
 271 void MyFrame::OnSetFontSize(wxCommandEvent& WXUNUSED(event))
 272 {
 273     long fontSize = wxGetNumberFromUser
 274                     (
 275                         _T("The font size also determines the caret size so\nthis demonstrates resizing the caret."),
 276                         _T("Font size (in points):"),
 277                         _T("wxCaret sample"),
 278                         12, 1, 100,
 279                         this
 280                     );
 281
 282     if ( fontSize != -1 )
 283     {
 284         m_canvas->SetFontSize((int)fontSize);
 285     }
 286 }
 287
 288 // ----------------------------------------------------------------------------
 289 // MyCanvas
 290 // ----------------------------------------------------------------------------
 291
 292 IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxScrolledWindow)
 293
 294 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
 295     EVT_PAINT(MyCanvas::OnPaint)
 296     EVT_SIZE(MyCanvas::OnSize)
 297     EVT_CHAR(MyCanvas::OnChar)
 298 END_EVENT_TABLE()
 299
 300 MyCanvas::MyCanvas( wxWindow *parent )
 301         : wxScrolledWindow( parent, wxID_ANY,
 302                             wxDefaultPosition, wxDefaultSize,
 303                             wxSUNKEN_BORDER )
 304 {
 305     m_text = (wxChar *)NULL;
 306
 307     SetBackgroundColour(*wxWHITE);
 308
 309     SetFontSize(12);
 310
 311     m_xCaret = m_yCaret =
 312     m_xChars = m_yChars = 0;
 313
 314     m_xMargin = m_yMargin = 5;
 315
 316     CreateCaret();
 317 }
 318
 319 MyCanvas::~MyCanvas()
 320 {
 321     free(m_text);
 322 }
 323
 324 void MyCanvas::CreateCaret()
 325 {
 326     wxCaret *caret = new wxCaret(this, m_widthChar, m_heightChar);
 327     SetCaret(caret);
 328
 329     caret->Move(m_xMargin, m_yMargin);
 330     caret->Show();
 331 }
 332
 333 void MyCanvas::SetFontSize(int fontSize)
 334 {
 335     m_font = wxFont(fontSize, wxFONTFAMILY_TELETYPE,
 336                     wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL);
 337
 338     wxClientDC dc(this);
 339     dc.SetFont(m_font);
 340     m_heightChar = dc.GetCharHeight();
 341     m_widthChar = dc.GetCharWidth();
 342
 343     wxCaret *caret = GetCaret();
 344     if ( caret )
 345     {
 346         caret->SetSize(m_widthChar, m_heightChar);
 347
 348         ChangeSize();
 349     }
 350 }
 351
 352 void MyCanvas::MoveCaret(int x, int y)
 353 {
 354     m_xCaret = x;
 355     m_yCaret = y;
 356
 357     DoMoveCaret();
 358 }
 359
 360 void MyCanvas::DoMoveCaret()
 361 {
 362     wxLogStatus(_T("Caret is at (%d, %d)"), m_xCaret, m_yCaret);
 363
 364     GetCaret()->Move(m_xMargin + m_xCaret * m_widthChar,
 365                      m_yMargin + m_yCaret * m_heightChar);
 366 }
 367
 368 void MyCanvas::OnSize(wxSizeEvent& event)
 369 {
 370     ChangeSize();
 371
 372     event.Skip();
 373 }
 374
 375 void MyCanvas::ChangeSize()
 376 {
 377     wxSize size = GetClientSize();
 378     m_xChars = (size.x - 2*m_xMargin) / m_widthChar;
 379     m_yChars = (size.y - 2*m_yMargin) / m_heightChar;
 380     if ( !m_xChars )
 381         m_xChars = 1;
 382     if ( !m_yChars )
 383         m_yChars = 1;
 384
 385     free(m_text);
 386     m_text = (wxChar *)calloc(m_xChars * m_yChars, sizeof(wxChar));
 387
 388     wxFrame *frame = wxDynamicCast(GetParent(), wxFrame);
 389
 390     if ( frame && frame->GetStatusBar() )
 391     {
 392         wxString msg;
 393         msg.Printf(_T("Panel size is (%d, %d)"), m_xChars, m_yChars);
 394
 395         frame->SetStatusText(msg, 1);
 396     }
 397 }
 398
 399 // NB: this method is horrible inefficient especially because the caret
 400 //     needs to be redrawn often and in this case we only have to redraw
 401 //     the caret location and not the entire window - in a real program we
 402 //     would use GetUpdateRegion() and iterate over rectangles it contains
 403 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 404 {
 405     wxCaretSuspend cs(this);
 406     wxPaintDC dc( this );
 407     PrepareDC( dc );
 408     dc.Clear();
 409
 410     dc.SetFont( m_font );
 411
 412     for ( int y = 0; y < m_yChars; y++ )
 413     {
 414         wxString line;
 415
 416         for ( int x = 0; x < m_xChars; x++ )
 417         {
 418             wxChar ch = CharAt(x, y);
 419             if ( !ch )
 420                 ch = _T(' ');
 421             line += ch;
 422         }
 423
 424         dc.DrawText( line, m_xMargin, m_yMargin + y * m_heightChar );
 425     }
 426 }
 427
 428 void MyCanvas::OnChar( wxKeyEvent &event )
 429 {
 430     switch ( event.GetKeyCode() )
 431     {
 432         case WXK_LEFT:
 433             PrevChar();
 434             break;
 435
 436         case WXK_RIGHT:
 437             NextChar();
 438             break;
 439
 440         case WXK_UP:
 441             PrevLine();
 442             break;
 443
 444         case WXK_DOWN:
 445             NextLine();
 446             break;
 447
 448         case WXK_HOME:
 449             Home();
 450             break;
 451
 452         case WXK_END:
 453             End();
 454             break;
 455
 456         case WXK_RETURN:
 457             Home();
 458             NextLine();
 459             break;
 460
 461         default:
 462             if ( !event.AltDown() && wxIsprint(event.GetKeyCode()) )
 463             {
 464                 wxChar ch = (wxChar)event.GetKeyCode();
 465                 CharAt(m_xCaret, m_yCaret) = ch;
 466
 467                 wxCaretSuspend cs(this);
 468                 wxClientDC dc(this);
 469                 dc.SetFont(m_font);
 470                 dc.SetBackgroundMode(wxSOLID); // overwrite old value
 471                 dc.DrawText(ch, m_xMargin + m_xCaret * m_widthChar,
 472                                 m_yMargin + m_yCaret * m_heightChar );
 473
 474                 NextChar();
 475             }
 476             else
 477             {
 478                 event.Skip();
 479             }
 480     }
 481
 482     DoMoveCaret();
 483 }
 484