samples/minimal/minimal.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        minimal.cpp
   3 // Purpose:     Minimal wxWidgets sample
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx/wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 // for all others, include the necessary headers (this file is usually all you
  28 // need because it includes almost all "standard" wxWidgets headers)
  29 #ifndef WX_PRECOMP
  30     #include "wx/wx.h"
  31 #endif
  32
  33 // ----------------------------------------------------------------------------
  34 // resources
  35 // ----------------------------------------------------------------------------
  36
  37 // the application icon (under Windows and OS/2 it is in resources and even
  38 // though we could still include the XPM here it would be unused)
  39 #if !defined(__WXMSW__) && !defined(__WXPM__)
  40     #include "../sample.xpm"
  41 #endif
  42
  43 // ----------------------------------------------------------------------------
  44 // private classes
  45 // ----------------------------------------------------------------------------
  46
  47 // Define a new application type, each program should derive a class from wxApp
  48 class MyApp : public wxApp
  49 {
  50 public:
  51     // override base class virtuals
  52     // ----------------------------
  53
  54     // this one is called on application startup and is a good place for the app
  55     // initialization (doing it here and not in the ctor allows to have an error
  56     // return: if OnInit() returns false, the application terminates)
  57     virtual bool OnInit();
  58 };
  59
  60 // Define a new frame type: this is going to be our main frame
  61 class MyFrame : public wxFrame
  62 {
  63 public:
  64     // ctor(s)
  65     MyFrame(const wxString& title);
  66
  67     // event handlers (these functions should _not_ be virtual)
  68     void OnQuit(wxCommandEvent& event);
  69     void OnAbout(wxCommandEvent& event);
  70
  71     void OnPaint(wxPaintEvent&)
  72     {
  73         wxPaintDC dc(this);
  74
  75         wxBitmap bmp(100, 100, 1);
  76         {
  77             wxMemoryDC memdc(bmp);
  78             memdc.SetBackground(*wxWHITE);
  79             memdc.SetTextForeground(*wxBLACK);
  80             memdc.Clear();
  81             memdc.DrawText(_T("Hello wx!"), 10, 10);
  82         }
  83
  84         wxBitmap bmp2 = bmp;
  85         {
  86             wxMemoryDC memdc(bmp2);
  87             memdc.SetBackground(*wxWHITE);
  88             memdc.SetTextForeground(*wxRED);
  89             memdc.Clear();
  90             memdc.DrawText(_T("Goodbye!"), 10, 10);
  91         }
  92
  93         dc.DrawBitmap(bmp, 10, 10);
  94         dc.DrawBitmap(bmp2, 120, 10);
  95     }
  96
  97 private:
  98     // any class wishing to process wxWidgets events must use this macro
  99     DECLARE_EVENT_TABLE()
 100 };
 101
 102 // ----------------------------------------------------------------------------
 103 // constants
 104 // ----------------------------------------------------------------------------
 105
 106 // IDs for the controls and the menu commands
 107 enum
 108 {
 109     // menu items
 110     Minimal_Quit = wxID_EXIT,
 111
 112     // it is important for the id corresponding to the "About" command to have
 113     // this standard value as otherwise it won't be handled properly under Mac
 114     // (where it is special and put into the "Apple" menu)
 115     Minimal_About = wxID_ABOUT
 116 };
 117
 118 // ----------------------------------------------------------------------------
 119 // event tables and other macros for wxWidgets
 120 // ----------------------------------------------------------------------------
 121
 122 // the event tables connect the wxWidgets events with the functions (event
 123 // handlers) which process them. It can be also done at run-time, but for the
 124 // simple menu events like this the static method is much simpler.
 125 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 126     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 127     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 128 END_EVENT_TABLE()
 129
 130 // Create a new application object: this macro will allow wxWidgets to create
 131 // the application object during program execution (it's better than using a
 132 // static object for many reasons) and also implements the accessor function
 133 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 134 // not wxApp)
 135 IMPLEMENT_APP(MyApp)
 136
 137 // ============================================================================
 138 // implementation
 139 // ============================================================================
 140
 141 // ----------------------------------------------------------------------------
 142 // the application class
 143 // ----------------------------------------------------------------------------
 144
 145 // 'Main program' equivalent: the program execution "starts" here
 146 bool MyApp::OnInit()
 147 {
 148     // call the base class initialization method, currently it only parses a
 149     // few common command-line options but it could be do more in the future
 150     if ( !wxApp::OnInit() )
 151         return false;
 152
 153     // create the main application window
 154     MyFrame *frame = new MyFrame(_T("Minimal wxWidgets App"));
 155
 156     // and show it (the frames, unlike simple controls, are not shown when
 157     // created initially)
 158     frame->Show(true);
 159
 160     // success: wxApp::OnRun() will be called which will enter the main message
 161     // loop and the application will run. If we returned false here, the
 162     // application would exit immediately.
 163     return true;
 164 }
 165
 166 // ----------------------------------------------------------------------------
 167 // main frame
 168 // ----------------------------------------------------------------------------
 169
 170 // frame constructor
 171 MyFrame::MyFrame(const wxString& title)
 172        : wxFrame(NULL, wxID_ANY, title)
 173 {
 174     Connect(wxEVT_PAINT, wxPaintEventHandler(MyFrame::OnPaint));
 175     // set the frame icon
 176     SetIcon(wxICON(sample));
 177
 178 #if wxUSE_MENUS
 179     // create a menu bar
 180     wxMenu *fileMenu = new wxMenu;
 181
 182     // the "About" item should be in the help menu
 183     wxMenu *helpMenu = new wxMenu;
 184     helpMenu->Append(Minimal_About, _T("&About...\tF1"), _T("Show about dialog"));
 185
 186     fileMenu->Append(Minimal_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
 187
 188     // now append the freshly created menu to the menu bar...
 189     wxMenuBar *menuBar = new wxMenuBar();
 190     menuBar->Append(fileMenu, _T("&File"));
 191     menuBar->Append(helpMenu, _T("&Help"));
 192
 193     // ... and attach this menu bar to the frame
 194     SetMenuBar(menuBar);
 195 #endif // wxUSE_MENUS
 196
 197     wxTextCtrl *m_textctrl = new wxTextCtrl(this, -1, _T(""), wxPoint(100,
 198                 100), wxSize(100, 100), wxTE_MULTILINE);
 199     wxTextAttr t_style ( *wxRED );
 200     m_textctrl->SetDefaultStyle(t_style);
 201     m_textctrl->Clear();
 202     m_textctrl->WriteText(_T("Must be red"));
 203
 204 #if wxUSE_STATUSBAR
 205     // create a status bar just for fun (by default with 1 pane only)
 206     CreateStatusBar(2);
 207     SetStatusText(_T("Welcome to wxWidgets!"));
 208 #endif // wxUSE_STATUSBAR
 209 }
 210
 211
 212 // event handlers
 213
 214 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 215 {
 216     // true is to force the frame to close
 217     Close(true);
 218 }
 219
 220 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 221 {
 222     wxMessageBox(wxString::Format(
 223                     _T("Welcome to %s!\n")
 224                     _T("\n")
 225                     _T("This is the minimal wxWidgets sample\n")
 226                     _T("running under %s."),
 227                     wxVERSION_STRING,
 228                     wxGetOsDescription().c_str()
 229                  ),
 230                  _T("About wxWidgets minimal sample"),
 231                  wxOK | wxICON_INFORMATION,
 232                  this);
 233 }