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 #ifndef wxHAS_IMAGES_IN_RESOURCES
  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 private:
  72     // any class wishing to process wxWidgets events must use this macro
  73     DECLARE_EVENT_TABLE()
  74 };
  75
  76 // ----------------------------------------------------------------------------
  77 // constants
  78 // ----------------------------------------------------------------------------
  79
  80 // IDs for the controls and the menu commands
  81 enum
  82 {
  83     // menu items
  84     Minimal_Quit = wxID_EXIT,
  85
  86     // it is important for the id corresponding to the "About" command to have
  87     // this standard value as otherwise it won't be handled properly under Mac
  88     // (where it is special and put into the "Apple" menu)
  89     Minimal_About = wxID_ABOUT
  90 };
  91
  92 // ----------------------------------------------------------------------------
  93 // event tables and other macros for wxWidgets
  94 // ----------------------------------------------------------------------------
  95
  96 // the event tables connect the wxWidgets events with the functions (event
  97 // handlers) which process them. It can be also done at run-time, but for the
  98 // simple menu events like this the static method is much simpler.
  99 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 100     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 101     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 102 END_EVENT_TABLE()
 103
 104 // Create a new application object: this macro will allow wxWidgets to create
 105 // the application object during program execution (it's better than using a
 106 // static object for many reasons) and also implements the accessor function
 107 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 108 // not wxApp)
 109 IMPLEMENT_APP(MyApp)
 110
 111 // ============================================================================
 112 // implementation
 113 // ============================================================================
 114
 115 // ----------------------------------------------------------------------------
 116 // the application class
 117 // ----------------------------------------------------------------------------
 118
 119 // 'Main program' equivalent: the program execution "starts" here
 120 bool MyApp::OnInit()
 121 {
 122     // call the base class initialization method, currently it only parses a
 123     // few common command-line options but it could be do more in the future
 124     if ( !wxApp::OnInit() )
 125         return false;
 126
 127     // create the main application window
 128     MyFrame *frame = new MyFrame("Minimal wxWidgets App");
 129
 130     // and show it (the frames, unlike simple controls, are not shown when
 131     // created initially)
 132     frame->Show(true);
 133
 134     // success: wxApp::OnRun() will be called which will enter the main message
 135     // loop and the application will run. If we returned false here, the
 136     // application would exit immediately.
 137     return true;
 138 }
 139
 140 // ----------------------------------------------------------------------------
 141 // main frame
 142 // ----------------------------------------------------------------------------
 143
 144 // frame constructor
 145 MyFrame::MyFrame(const wxString& title)
 146        : wxFrame(NULL, wxID_ANY, title)
 147 {
 148     // set the frame icon
 149     SetIcon(wxICON(sample));
 150
 151 #if wxUSE_MENUS
 152     // create a menu bar
 153     wxMenu *fileMenu = new wxMenu;
 154
 155     // the "About" item should be in the help menu
 156     wxMenu *helpMenu = new wxMenu;
 157     helpMenu->Append(Minimal_About, "&About\tF1", "Show about dialog");
 158
 159     fileMenu->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 160
 161     // now append the freshly created menu to the menu bar...
 162     wxMenuBar *menuBar = new wxMenuBar();
 163     menuBar->Append(fileMenu, "&File");
 164     menuBar->Append(helpMenu, "&Help");
 165
 166     // ... and attach this menu bar to the frame
 167     SetMenuBar(menuBar);
 168 #endif // wxUSE_MENUS
 169
 170 #if wxUSE_STATUSBAR
 171     // create a status bar just for fun (by default with 1 pane only)
 172     CreateStatusBar(2);
 173     SetStatusText("Welcome to wxWidgets!");
 174 #endif // wxUSE_STATUSBAR
 175 }
 176
 177
 178 // event handlers
 179
 180 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 181 {
 182     // true is to force the frame to close
 183     Close(true);
 184 }
 185
 186 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 187 {
 188     wxMessageBox(wxString::Format
 189                  (
 190                     "Welcome to %s!\n"
 191                     "\n"
 192                     "This is the minimal wxWidgets sample\n"
 193                     "running under %s.",
 194                     wxVERSION_STRING,
 195                     wxGetOsDescription()
 196                  ),
 197                  "About wxWidgets minimal sample",
 198                  wxOK | wxICON_INFORMATION,
 199                  this);
 200 }