samples/minimal/minimal.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        minimal.cpp
   3 // Purpose:     Minimal wxWindows 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 #ifdef __GNUG__
  20     #pragma implementation "minimal.cpp"
  21     #pragma interface "minimal.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 #endif
  36
  37 // ----------------------------------------------------------------------------
  38 // ressources
  39 // ----------------------------------------------------------------------------
  40 // the application icon
  41 #if defined(__WXGTK__) || defined(__WXMOTIF__)
  42     #include "mondrian.xpm"
  43 #endif
  44
  45 // ----------------------------------------------------------------------------
  46 // private classes
  47 // ----------------------------------------------------------------------------
  48
  49 // Define a new application type, each program should derive a class from wxApp
  50 class MyApp : public wxApp
  51 {
  52 public:
  53     // override base class virtuals
  54     // ----------------------------
  55
  56     // this one is called on application startup and is a good place for the app
  57     // initialization (doing it here and not in the ctor allows to have an error
  58     // return: if OnInit() returns false, the application terminates)
  59     virtual bool OnInit();
  60 };
  61
  62 // Define a new frame type: this is going to be our main frame
  63 class MyFrame : public wxFrame
  64 {
  65 public:
  66     // ctor(s)
  67     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  68
  69     // event handlers (these functions should _not_ be virtual)
  70     void OnQuit(wxCommandEvent& event);
  71     void OnAbout(wxCommandEvent& event);
  72
  73 private:
  74     // any class wishing to process wxWindows events must use this macro
  75     DECLARE_EVENT_TABLE()
  76 };
  77
  78 // ----------------------------------------------------------------------------
  79 // constants
  80 // ----------------------------------------------------------------------------
  81
  82 // IDs for the controls and the menu commands
  83 enum
  84 {
  85     // menu items
  86     Minimal_Quit = 1,
  87     Minimal_About
  88 };
  89
  90 // ----------------------------------------------------------------------------
  91 // event tables and other macros for wxWindows
  92 // ----------------------------------------------------------------------------
  93
  94 // the event tables connect the wxWindows events with the functions (event
  95 // handlers) which process them. It can be also done at run-time, but for the
  96 // simple menu events like this the static method is much simpler.
  97 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  98     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
  99     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 100 END_EVENT_TABLE()
 101
 102 // Create a new application object: this macro will allow wxWindows to create
 103 // the application object during program execution (it's better than using a
 104 // static object for many reasons) and also declares the accessor function
 105 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 106 // not wxApp)
 107 IMPLEMENT_APP(MyApp)
 108
 109 // ============================================================================
 110 // implementation
 111 // ============================================================================
 112
 113 // ----------------------------------------------------------------------------
 114 // the application class
 115 // ----------------------------------------------------------------------------
 116
 117 // `Main program' equivalent: the program execution "starts" here
 118 bool MyApp::OnInit()
 119 {
 120     // create the main application window
 121     MyFrame *frame = new MyFrame("Minimal wxWindows App",
 122                                  wxPoint(50, 50), wxSize(450, 340));
 123
 124     // and show it (the frames, unlike simple controls, are not shown when
 125     // created initially)
 126     frame->Show(TRUE);
 127
 128     // success: wxApp::OnRun() will be called which will enter the main message
 129     // loop and the application will run. If we returned FALSE here, the
 130     // application would exit immediately.
 131     return TRUE;
 132 }
 133
 134 // ----------------------------------------------------------------------------
 135 // main frame
 136 // ----------------------------------------------------------------------------
 137
 138 // frame constructor
 139 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 140        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 141 {
 142 #ifdef __WXMAC__
 143     // we need this in order to allow the about menu relocation, since ABOUT is
 144     // not the default id of the about menu
 145     wxApp::s_macAboutMenuItemId = Minimal_About;
 146 #endif
 147
 148     // set the frame icon
 149     SetIcon(wxICON(mondrian));
 150
 151     // create a menu bar
 152     wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
 153
 154     // the "About" item should be in the help menu
 155     wxMenu *helpMenu = new wxMenu;
 156     helpMenu->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
 157
 158     menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 159
 160     // now append the freshly created menu to the menu bar...
 161     wxMenuBar *menuBar = new wxMenuBar();
 162     menuBar->Append(menuFile, "&File");
 163     menuBar->Append(helpMenu, "&Help");
 164
 165     // ... and attach this menu bar to the frame
 166     SetMenuBar(menuBar);
 167
 168 #if wxUSE_STATUSBAR
 169     // create a status bar just for fun (by default with 1 pane only)
 170     CreateStatusBar(2);
 171     SetStatusText("Welcome to wxWindows!");
 172 #endif // wxUSE_STATUSBAR
 173 }
 174
 175
 176 // event handlers
 177
 178 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 179 {
 180     // TRUE is to force the frame to close
 181     Close(TRUE);
 182 }
 183
 184 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 185 {
 186     wxString msg;
 187     msg.Printf( _T("This is the about dialog of minimal sample.\n")
 188                 _T("Welcome to %s"), wxVERSION_STRING);
 189
 190     wxMessageBox(msg, "About Minimal", wxOK | wxICON_INFORMATION, this);
 191 }