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< wxWindows headers
  21 #ifndef WX_PRECOMP
  22     #include "wx/wx.h"
  23
  24     #include "wx/log.h"
  25 #endif
  26
  27 #include "wx/caret.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 CreateCaret();
  66     void MoveCaret(int x, int y);
  67
  68     // caret movement
  69     void Home() { m_xCaret = 0; }
  70     void End() { m_xCaret = m_xChars - 1; }
  71     void FirstLine() { m_yCaret = 0; }
  72     void LastLine() { m_yCaret = m_yChars - 1; }
  73     void PrevChar() { if ( !m_xCaret-- ) { End(); PrevLine(); } }
  74     void NextChar() { if ( ++m_xCaret == m_xChars ) { Home(); NextLine(); } }
  75     void PrevLine() { if ( !m_yCaret-- ) LastLine(); }
  76     void NextLine() { if ( ++m_yCaret == m_yChars ) FirstLine(); }
  77
  78     // event handlers
  79     void OnPaint( wxPaintEvent &event );
  80     void OnSize( wxSizeEvent &event );
  81     void OnChar( wxKeyEvent &event );
  82
  83 private:
  84     // move the caret to m_xCaret, m_yCaret
  85     void DoMoveCaret();
  86
  87     wxFont   m_font;
  88
  89     // the margin around the text (looks nicer)
  90     int      m_xMargin, m_yMargin;
  91
  92     // size (in pixels) of one character
  93     long     m_widthChar, m_heightChar;
  94
  95     // position (in text coords) of the caret
  96     int      m_xCaret, m_yCaret;
  97
  98     // the size (in text coords) of the window
  99     int      m_xChars, m_yChars;
 100
 101     // the text
 102     wxChar  *m_text;
 103
 104     DECLARE_DYNAMIC_CLASS(MyCanvas)
 105     DECLARE_EVENT_TABLE()
 106 };
 107
 108
 109 // Define a new frame type: this is going to be our main frame
 110 class MyFrame : public wxFrame
 111 {
 112 public:
 113     // ctor(s)
 114     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
 115
 116     // event handlers (these functions should _not_ be virtual)
 117     void OnQuit(wxCommandEvent& event);
 118     void OnAbout(wxCommandEvent& event);
 119     void OnSetBlinkTime(wxCommandEvent& event);
 120     void OnCaretMove(wxCommandEvent& event);
 121
 122 private:
 123     MyCanvas *m_canvas;
 124
 125     // any class wishing to process wxWindows events must use this macro
 126     DECLARE_EVENT_TABLE()
 127 };
 128
 129 // ----------------------------------------------------------------------------
 130 // constants
 131 // ----------------------------------------------------------------------------
 132
 133 // IDs for the controls and the menu commands
 134 enum
 135 {
 136     // menu items
 137     Caret_Quit = 1,
 138     Caret_About,
 139     Caret_SetBlinkTime,
 140     Caret_Move,
 141
 142     // controls start here (the numbers are, of course, arbitrary)
 143     Caret_Text = 1000
 144 };
 145
 146 // ----------------------------------------------------------------------------
 147 // event tables and other macros for wxWindows
 148 // ----------------------------------------------------------------------------
 149
 150 // the event tables connect the wxWindows events with the functions (event
 151 // handlers) which process them. It can be also done at run-time, but for the
 152 // simple menu events like this the static method is much simpler.
 153 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 154     EVT_MENU(Caret_Quit,  MyFrame::OnQuit)
 155     EVT_MENU(Caret_About, MyFrame::OnAbout)
 156     EVT_MENU(Caret_SetBlinkTime, MyFrame::OnSetBlinkTime)
 157     EVT_MENU(Caret_Move, MyFrame::OnCaretMove)
 158 END_EVENT_TABLE()
 159
 160 // Create a new application object: this macro will allow wxWindows to create
 161 // the application object during program execution (it's better than using a
 162 // static object for many reasons) and also declares the accessor function
 163 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 164 // not wxApp)
 165 IMPLEMENT_APP(MyApp)
 166
 167 // ============================================================================
 168 // implementation
 169 // ============================================================================
 170
 171 // ----------------------------------------------------------------------------
 172 // the application class
 173 // ----------------------------------------------------------------------------
 174
 175 // `Main program' equivalent: the program execution "starts" here
 176 bool MyApp::OnInit()
 177 {
 178     // create and show the main application window
 179     MyFrame *frame = new MyFrame("Caret wxWindows sample",
 180                                  wxPoint(50, 50), wxSize(450, 340));
 181
 182     frame->Show(TRUE);
 183
 184     // success: wxApp::OnRun() will be called which will enter the main message
 185     // loop and the application will run. If we returned FALSE here, the
 186     // application would exit immediately.
 187     return TRUE;
 188 }
 189
 190 // ----------------------------------------------------------------------------
 191 // main frame
 192 // ----------------------------------------------------------------------------
 193
 194 // frame constructor
 195 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 196        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 197 {
 198     // set the frame icon
 199     SetIcon(wxICON(mondrian));
 200
 201     // create a menu bar
 202     wxMenu *menuFile = new wxMenu;
 203
 204     menuFile->Append(Caret_SetBlinkTime, "&Blink time...\tCtrl-B");
 205     menuFile->Append(Caret_Move, "&Move caret\tCtrl-C");
 206     menuFile->AppendSeparator();
 207     menuFile->Append(Caret_About, "&About...\tCtrl-A", "Show about dialog");
 208     menuFile->AppendSeparator();
 209     menuFile->Append(Caret_Quit, "E&xit\tAlt-X", "Quit this program");
 210
 211     // now append the freshly created menu to the menu bar...
 212     wxMenuBar *menuBar = new wxMenuBar;
 213     menuBar->Append(menuFile, "&File");
 214
 215     // ... and attach this menu bar to the frame
 216     SetMenuBar(menuBar);
 217
 218     m_canvas = new MyCanvas(this);
 219
 220     // create a status bar just for fun (by default with 1 pane only)
 221     CreateStatusBar(2);
 222     SetStatusText("Welcome to wxWindows!");
 223 }
 224
 225
 226 // event handlers
 227
 228 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 229 {
 230     // TRUE is to force the frame to close
 231     Close(TRUE);
 232 }
 233
 234 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 235 {
 236     wxMessageBox(_T("The caret wxWindows sample.\n© 1999 Vadim Zeitlin"),
 237                  _T("About Caret"), wxOK | wxICON_INFORMATION, this);
 238 }
 239
 240 void MyFrame::OnCaretMove(wxCommandEvent& WXUNUSED(event))
 241 {
 242     m_canvas->MoveCaret(10, 10);
 243 }
 244
 245 void MyFrame::OnSetBlinkTime(wxCommandEvent& WXUNUSED(event))
 246 {
 247     long blinkTime = wxGetNumberFromUser
 248                      (
 249                       _T("The caret blink time is the time between two blinks"),
 250                       _T("Time in milliseconds:"),
 251                       _T("wxCaret sample"),
 252                       wxCaret::GetBlinkTime(), 0, 10000,
 253                       this
 254                      );
 255     if ( blinkTime != -1 )
 256     {
 257         wxCaret::SetBlinkTime((int)blinkTime);
 258         m_canvas->CreateCaret();
 259         wxLogStatus(this, _T("Blink time set to %ld milliseconds."), blinkTime);
 260     }
 261 }
 262
 263 // ----------------------------------------------------------------------------
 264 // MyCanvas
 265 // ----------------------------------------------------------------------------
 266
 267 IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxScrolledWindow)
 268
 269 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
 270     EVT_PAINT(MyCanvas::OnPaint)
 271     EVT_SIZE(MyCanvas::OnSize)
 272     EVT_CHAR(MyCanvas::OnChar)
 273 END_EVENT_TABLE()
 274
 275 MyCanvas::MyCanvas( wxWindow *parent )
 276         : wxScrolledWindow( parent, -1,
 277                             wxDefaultPosition, wxDefaultSize,
 278                             wxSUNKEN_BORDER )
 279 {
 280     m_text = (wxChar *)NULL;
 281
 282     SetBackgroundColour(*wxWHITE);
 283
 284     m_font = wxFont(12, wxFONTFAMILY_TELETYPE,
 285                     wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL);
 286
 287     m_xCaret = m_yCaret =
 288     m_xChars = m_yChars = 0;
 289
 290     m_xMargin = m_yMargin = 5;
 291
 292     CreateCaret();
 293 }
 294
 295 MyCanvas::~MyCanvas()
 296 {
 297     free(m_text);
 298 }
 299
 300 void MyCanvas::CreateCaret()
 301 {
 302     wxClientDC dc(this);
 303     dc.SetFont(m_font);
 304     m_heightChar = dc.GetCharHeight();
 305     m_widthChar = dc.GetCharWidth();
 306
 307     wxCaret *caret = new wxCaret(this, m_widthChar, m_heightChar);
 308     SetCaret(caret);
 309
 310     caret->Move(m_xMargin, m_yMargin);
 311     caret->Show();
 312 }
 313
 314 void MyCanvas::MoveCaret(int x, int y)
 315 {
 316     m_xCaret = x;
 317     m_yCaret = y;
 318
 319     DoMoveCaret();
 320 }
 321
 322 void MyCanvas::DoMoveCaret()
 323 {
 324     wxLogStatus(_T("Caret is at (%d, %d)"), m_xCaret, m_yCaret);
 325
 326     GetCaret()->Move(m_xMargin + m_xCaret * m_widthChar,
 327                      m_yMargin + m_yCaret * m_heightChar);
 328 }
 329
 330 void MyCanvas::OnSize( wxSizeEvent &event )
 331 {
 332     m_xChars = (event.GetSize().x - 2*m_xMargin) / m_widthChar;
 333     m_yChars = (event.GetSize().y - 2*m_yMargin) / m_heightChar;
 334     if ( !m_xChars )
 335         m_xChars = 1;
 336     if ( !m_yChars )
 337         m_yChars = 1;
 338
 339     free(m_text);
 340     m_text = (wxChar *)calloc(m_xChars * m_yChars, sizeof(wxChar));
 341
 342     wxFrame *frame = wxDynamicCast(GetParent(), wxFrame);
 343
 344     if ( frame && frame->GetStatusBar() )
 345     {
 346         wxString msg;
 347         msg.Printf(_T("Panel size is (%d, %d)"), m_xChars, m_yChars);
 348
 349         frame->SetStatusText(msg, 1);
 350     }
 351
 352     event.Skip();
 353 }
 354
 355 // NB: this method is horrible inefficient especially because the caret
 356 //     needs to be redrawn often and in this case we only have to redraw
 357 //     the caret location and not the entire window - in a real program we
 358 //     would use GetUpdateRegion() and iterate over rectangles it contains
 359 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 360 {
 361     wxCaretSuspend cs(this);
 362     wxPaintDC dc( this );
 363     PrepareDC( dc );
 364     dc.Clear();
 365
 366     dc.SetFont( m_font );
 367
 368     for ( int y = 0; y < m_yChars; y++ )
 369     {
 370         wxString line;
 371
 372         for ( int x = 0; x < m_xChars; x++ )
 373         {
 374             wxChar ch = CharAt(x, y);
 375             if ( !ch )
 376                 ch = _T(' ');
 377             line += ch;
 378         }
 379
 380         dc.DrawText( line, m_xMargin, m_yMargin + y * m_heightChar );
 381     }
 382 }
 383
 384 void MyCanvas::OnChar( wxKeyEvent &event )
 385 {
 386     switch ( event.KeyCode() )
 387     {
 388         case WXK_LEFT:
 389             PrevChar();
 390             break;
 391
 392         case WXK_RIGHT:
 393             NextChar();
 394             break;
 395
 396         case WXK_UP:
 397             PrevLine();
 398             break;
 399
 400         case WXK_DOWN:
 401             NextLine();
 402             break;
 403
 404         case WXK_HOME:
 405             Home();
 406             break;
 407
 408         case WXK_END:
 409             End();
 410             break;
 411
 412         case WXK_RETURN:
 413             Home();
 414             NextLine();
 415             break;
 416
 417         default:
 418             if ( !event.AltDown() && wxIsprint(event.KeyCode()) )
 419             {
 420                 wxChar ch = (wxChar)event.KeyCode();
 421                 CharAt(m_xCaret, m_yCaret) = ch;
 422
 423                 wxCaretSuspend cs(this);
 424                 wxClientDC dc(this);
 425                 dc.SetFont(m_font);
 426                 dc.SetBackgroundMode(wxSOLID); // overwrite old value
 427                 dc.DrawText(ch, m_xMargin + m_xCaret * m_widthChar,
 428                                 m_yMargin + m_yCaret * m_heightChar );
 429
 430                 NextChar();
 431             }
 432             else
 433             {
 434                 event.Skip();
 435             }
 436     }
 437
 438     DoMoveCaret();
 439 }
 440