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 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19 #ifdef __GNUG__
  20     #pragma implementation "caret.cpp"
  21     #pragma interface "caret.cpp"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx/wx.h".
  25 #include <wx/wxprec.h>
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 // for all others, include the necessary headers (this file is usually all you
  32 // need because it includes almost all <standard< wxWindows headers
  33 #ifndef WX_PRECOMP
  34     #include <wx/wx.h>
  35
  36     #include <wx/log.h>
  37 #endif
  38
  39 #include "wx/caret.h"
  40
  41 // ----------------------------------------------------------------------------
  42 // ressources
  43 // ----------------------------------------------------------------------------
  44 // the application icon
  45 #if defined(__WXGTK__) || defined(__WXMOTIF__)
  46     #include "mondrian.xpm"
  47 #endif
  48
  49 // ----------------------------------------------------------------------------
  50 // private classes
  51 // ----------------------------------------------------------------------------
  52
  53 // Define a new application type, each program should derive a class from wxApp
  54 class MyApp : public wxApp
  55 {
  56 public:
  57     // override base class virtuals
  58     // ----------------------------
  59
  60     // this one is called on application startup and is a good place for the app
  61     // initialization (doing it here and not in the ctor allows to have an error
  62     // return: if OnInit() returns false, the application terminates)
  63     virtual bool OnInit();
  64 };
  65
  66 // Define a new frame type: this is going to be our main frame
  67 class MyFrame : public wxFrame
  68 {
  69 public:
  70     // ctor(s)
  71     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  72
  73     // event handlers (these functions should _not_ be virtual)
  74     void OnQuit(wxCommandEvent& event);
  75     void OnAbout(wxCommandEvent& event);
  76
  77 private:
  78     // any class wishing to process wxWindows events must use this macro
  79     DECLARE_EVENT_TABLE()
  80 };
  81
  82 // MyCanvas is a canvas on which you can type
  83 class MyCanvas: public wxScrolledWindow
  84 {
  85 public:
  86     MyCanvas() { }
  87     MyCanvas( wxWindow *parent );
  88     ~MyCanvas();
  89
  90     char& CharAt(int x, int y) { return *(m_text + x + m_xChars * y); }
  91
  92     // caret movement
  93     void Home() { m_xCaret = 0; }
  94     void End() { m_xCaret = m_xChars - 1; }
  95     void FirstLine() { m_yCaret = 0; }
  96     void LastLine() { m_yCaret = m_yChars - 1; }
  97     void PrevChar() { if ( !m_xCaret-- ) { End(); PrevLine(); } }
  98     void NextChar() { if ( ++m_xCaret == m_xChars ) { Home(); NextLine(); } }
  99     void PrevLine() { if ( !m_yCaret-- ) LastLine(); }
 100     void NextLine() { if ( ++m_yCaret == m_yChars ) FirstLine(); }
 101
 102     // event handlers
 103     void OnPaint( wxPaintEvent &event );
 104     void OnSize( wxSizeEvent &event );
 105     void OnChar( wxKeyEvent &event );
 106
 107 private:
 108     wxCaret  m_caret;
 109     wxFont   m_font;
 110
 111     // the margin around the text (looks nicer)
 112     int      m_xMargin, m_yMargin;
 113
 114     // size (in pixels) of one character
 115     long     m_widthChar, m_heightChar;
 116
 117     // position (in text coords) of the caret
 118     int      m_xCaret, m_yCaret;
 119
 120     // the size (in text coords) of the window
 121     int      m_xChars, m_yChars;
 122
 123     // the text
 124     char    *m_text;
 125
 126     DECLARE_DYNAMIC_CLASS(MyCanvas)
 127     DECLARE_EVENT_TABLE()
 128 };
 129
 130 // ----------------------------------------------------------------------------
 131 // constants
 132 // ----------------------------------------------------------------------------
 133
 134 // IDs for the controls and the menu commands
 135 enum
 136 {
 137     // menu items
 138     Minimal_Quit = 1,
 139     Minimal_About,
 140     Minimal_Test1,
 141     Minimal_Test2,
 142
 143     // controls start here (the numbers are, of course, arbitrary)
 144     Minimal_Text = 1000,
 145 };
 146
 147 // ----------------------------------------------------------------------------
 148 // event tables and other macros for wxWindows
 149 // ----------------------------------------------------------------------------
 150
 151 // the event tables connect the wxWindows events with the functions (event
 152 // handlers) which process them. It can be also done at run-time, but for the
 153 // simple menu events like this the static method is much simpler.
 154 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 155     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 156     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 157 END_EVENT_TABLE()
 158
 159 // Create a new application object: this macro will allow wxWindows to create
 160 // the application object during program execution (it's better than using a
 161 // static object for many reasons) and also declares the accessor function
 162 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 163 // not wxApp)
 164 IMPLEMENT_APP(MyApp)
 165
 166 // ============================================================================
 167 // implementation
 168 // ============================================================================
 169
 170 // ----------------------------------------------------------------------------
 171 // the application class
 172 // ----------------------------------------------------------------------------
 173
 174 // `Main program' equivalent: the program execution "starts" here
 175 bool MyApp::OnInit()
 176 {
 177     // Create the main application window
 178     MyFrame *frame = new MyFrame("Minimal wxWindows App",
 179                                  wxPoint(50, 50), wxSize(450, 340));
 180
 181     // Show it and tell the application that it's our main window
 182     // @@@ what does it do exactly, in fact? is it necessary here?
 183     frame->Show(TRUE);
 184     SetTopWindow(frame);
 185
 186     // success: wxApp::OnRun() will be called which will enter the main message
 187     // loop and the application will run. If we returned FALSE here, the
 188     // application would exit immediately.
 189     return TRUE;
 190 }
 191
 192 // ----------------------------------------------------------------------------
 193 // main frame
 194 // ----------------------------------------------------------------------------
 195
 196 // frame constructor
 197 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 198        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 199 {
 200     // set the frame icon
 201     SetIcon(wxICON(mondrian));
 202
 203     // create a menu bar
 204     wxMenu *menuFile = new wxMenu;
 205
 206     menuFile->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
 207     menuFile->AppendSeparator();
 208     menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 209
 210     // now append the freshly created menu to the menu bar...
 211     wxMenuBar *menuBar = new wxMenuBar;
 212     menuBar->Append(menuFile, "&File");
 213
 214     // ... and attach this menu bar to the frame
 215     SetMenuBar(menuBar);
 216
 217     (void) new MyCanvas( this );
 218
 219     // create a status bar just for fun (by default with 1 pane only)
 220     CreateStatusBar(2);
 221     SetStatusText("Welcome to wxWindows!");
 222 }
 223
 224
 225 // event handlers
 226
 227 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 228 {
 229     // TRUE is to force the frame to close
 230     Close(TRUE);
 231 }
 232
 233 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 234 {
 235     wxString msg;
 236     msg.Printf( _T("This is the about dialog of minimal sample.\n")
 237                 _T("Welcome to %s")
 238 #ifdef wxBETA_NUMBER
 239                _T(" (beta %d)!")
 240 #endif // wxBETA_NUMBER
 241                , wxVERSION_STRING
 242 #ifdef wxBETA_NUMBER
 243                , wxBETA_NUMBER
 244 #endif // wxBETA_NUMBER
 245               );
 246
 247     wxMessageBox(msg, "About Minimal", wxOK | wxICON_INFORMATION, this);
 248 }
 249
 250
 251 // ----------------------------------------------------------------------------
 252 // MyCanvas
 253 // ----------------------------------------------------------------------------
 254
 255 IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxScrolledWindow)
 256
 257 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
 258     EVT_PAINT(MyCanvas::OnPaint)
 259     EVT_SIZE(MyCanvas::OnSize)
 260     EVT_CHAR(MyCanvas::OnChar)
 261 END_EVENT_TABLE()
 262
 263 MyCanvas::MyCanvas( wxWindow *parent )
 264         : wxScrolledWindow( parent, -1,
 265                             wxDefaultPosition, wxDefaultSize,
 266                             wxSUNKEN_BORDER )
 267 {
 268     m_text = (char *)NULL;
 269
 270     SetBackgroundColour(* wxWHITE);
 271
 272     m_font = *wxNORMAL_FONT;
 273
 274     wxClientDC dc(this);
 275     dc.SetFont( m_font );
 276     m_heightChar = dc.GetCharHeight();
 277     m_widthChar = dc.GetCharWidth();
 278
 279     m_caret.Create( this, m_widthChar, m_heightChar );
 280
 281     m_xCaret = m_yCaret =
 282     m_xChars = m_yChars = 0;
 283
 284     m_xMargin = m_yMargin = 5;
 285     m_caret.Move(m_xMargin, m_yMargin);
 286     m_caret.Show();
 287 }
 288
 289 MyCanvas::~MyCanvas()
 290 {
 291     free(m_text);
 292 }
 293
 294 void MyCanvas::OnSize( wxSizeEvent &event )
 295 {
 296     m_xChars = (event.GetSize().x - 2*m_xMargin) / m_widthChar;
 297     m_yChars = (event.GetSize().y - 2*m_yMargin) / m_heightChar;
 298     if ( !m_xChars )
 299         m_xChars = 1;
 300     if ( !m_yChars )
 301         m_yChars = 1;
 302
 303     free(m_text);
 304     m_text = (char *)calloc(m_xChars * m_yChars, sizeof(char));
 305
 306     wxString msg;
 307     msg.Printf("Panel size is (%d, %d)", m_xChars, m_yChars);
 308
 309     ((wxFrame *)GetParent())->SetStatusText(msg, 1);
 310
 311     event.Skip();
 312 }
 313
 314 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 315 {
 316     wxPaintDC dc( this );
 317     PrepareDC( dc );
 318
 319     dc.SetFont( m_font );
 320
 321     for ( int y = 0; y < m_yChars; y++ )
 322     {
 323         wxString line;
 324
 325         for ( int x = 0; x < m_xChars; x++ )
 326         {
 327             char ch = CharAt(x, y);
 328             if ( !ch )
 329                 ch = ' ';
 330             line += ch;
 331         }
 332
 333         dc.DrawText( line, m_xMargin, m_yMargin + y * m_heightChar );
 334     }
 335 }
 336
 337 void MyCanvas::OnChar( wxKeyEvent &event )
 338 {
 339     switch ( event.KeyCode() )
 340     {
 341         case WXK_LEFT:
 342             PrevChar();
 343             break;
 344
 345         case WXK_RIGHT:
 346             NextChar();
 347             break;
 348
 349         case WXK_UP:
 350             PrevLine();
 351             break;
 352
 353         case WXK_DOWN:
 354             NextLine();
 355             break;
 356
 357         case WXK_HOME:
 358             Home();
 359             break;
 360
 361         case WXK_END:
 362             End();
 363             break;
 364
 365         case WXK_RETURN:
 366             Home();
 367             NextLine();
 368             break;
 369
 370         default:
 371             if ( isprint(event.KeyCode()) )
 372             {
 373                 CharAt(m_xCaret, m_yCaret) = (char)event.KeyCode();
 374                 NextChar();
 375             }
 376             else
 377             {
 378                 // don't refresh
 379                 return;
 380             }
 381     }
 382
 383     wxLogStatus("Caret is at (%d, %d)", m_xCaret, m_yCaret);
 384
 385     m_caret.Move(m_xMargin + m_xCaret * m_widthChar,
 386                  m_yMargin + m_yCaret * m_heightChar);
 387
 388     Refresh();
 389 }
 390