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
  20 #ifdef __GNUG__
  21 //    #pragma implementation "minimal.cpp"
  22 //    #pragma interface "minimal.cpp"
  23 #endif
  24
  25 // For compilers that support precompilation, includes "wx/wx.h".
  26 #include "wx/wxprec.h"
  27
  28 #ifdef __BORLANDC__
  29     #pragma hdrstop
  30 #endif
  31
  32 // for all others, include the necessary headers (this file is usually all you
  33 // need because it includes almost all "standard" wxWindows headers)
  34 #ifndef WX_PRECOMP
  35     #include "wx/wx.h"
  36 #endif
  37
  38 // ----------------------------------------------------------------------------
  39 // resources
  40 // ----------------------------------------------------------------------------
  41 // the application icon
  42 #if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__)
  43     #include "mondrian.xpm"
  44 #endif
  45
  46 // ----------------------------------------------------------------------------
  47 // private classes
  48 // ----------------------------------------------------------------------------
  49
  50 // Define a new application type, each program should derive a class from wxApp
  51 class MyApp : public wxApp
  52 {
  53 public:
  54     // override base class virtuals
  55     // ----------------------------
  56
  57     // this one is called on application startup and is a good place for the app
  58     // initialization (doing it here and not in the ctor allows to have an error
  59     // return: if OnInit() returns false, the application terminates)
  60     virtual bool OnInit();
  61 };
  62
  63 // Define a new frame type: this is going to be our main frame
  64 class MyFrame : public wxFrame
  65 {
  66 public:
  67     // ctor(s)
  68     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  69
  70     // event handlers (these functions should _not_ be virtual)
  71     void OnQuit(wxCommandEvent& event);
  72     void OnAbout(wxCommandEvent& event);
  73
  74 private:
  75     // any class wishing to process wxWindows events must use this macro
  76     DECLARE_EVENT_TABLE()
  77 };
  78
  79 // ----------------------------------------------------------------------------
  80 // constants
  81 // ----------------------------------------------------------------------------
  82
  83 // IDs for the controls and the menu commands
  84 enum
  85 {
  86     // menu items
  87     Minimal_Quit = 1,
  88     Minimal_About
  89 };
  90
  91 // ----------------------------------------------------------------------------
  92 // event tables and other macros for wxWindows
  93 // ----------------------------------------------------------------------------
  94
  95 // the event tables connect the wxWindows events with the functions (event
  96 // handlers) which process them. It can be also done at run-time, but for the
  97 // simple menu events like this the static method is much simpler.
  98 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  99     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 100     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 101 END_EVENT_TABLE()
 102
 103 // Create a new application object: this macro will allow wxWindows to create
 104 // the application object during program execution (it's better than using a
 105 // static object for many reasons) and also declares the accessor function
 106 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 107 // not wxApp)
 108 IMPLEMENT_APP(MyApp)
 109
 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     // create the main application window
 123     MyFrame *frame = new MyFrame("Minimal wxWindows App",
 124                                  wxPoint(50, 50), wxSize(450, 340));
 125
 126     // and show it (the frames, unlike simple controls, are not shown when
 127     // created initially)
 128     frame->Show(TRUE);
 129
 130     // success: wxApp::OnRun() will be called which will enter the main message
 131     // loop and the application will run. If we returned FALSE here, the
 132     // application would exit immediately.
 133     return TRUE;
 134 }
 135
 136 // ----------------------------------------------------------------------------
 137 // main frame
 138 // ----------------------------------------------------------------------------
 139
 140 // frame constructor
 141 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 142        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 143 {
 144 #ifdef __WXMAC__
 145     // we need this in order to allow the about menu relocation, since ABOUT is
 146     // not the default id of the about menu
 147     wxApp::s_macAboutMenuItemId = Minimal_About;
 148 #endif
 149
 150     // set the frame icon
 151     SetIcon(wxICON(mondrian));
 152
 153 #if wxUSE_MENUS
 154     // create a menu bar
 155     wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
 156
 157     // the "About" item should be in the help menu
 158     wxMenu *helpMenu = new wxMenu;
 159     helpMenu->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
 160
 161     menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 162
 163     // now append the freshly created menu to the menu bar...
 164     wxMenuBar *menuBar = new wxMenuBar();
 165     menuBar->Append(menuFile, "&File");
 166     menuBar->Append(helpMenu, "&Help");
 167
 168     // ... and attach this menu bar to the frame
 169     SetMenuBar(menuBar);
 170 #endif // wxUSE_MENUS
 171
 172 #if wxUSE_STATUSBAR
 173     // create a status bar just for fun (by default with 1 pane only)
 174     CreateStatusBar(2);
 175     SetStatusText("Welcome to wxWindows!");
 176 #endif // wxUSE_STATUSBAR
 177 }
 178
 179
 180 // event handlers
 181
 182 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 183 {
 184     // TRUE is to force the frame to close
 185     Close(TRUE);
 186 }
 187
 188 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 189 {
 190     wxString msg;
 191     msg.Printf( _T("This is the about dialog of minimal sample.\n")
 192                 _T("Welcome to %s"), wxVERSION_STRING);
 193
 194     wxMessageBox(msg, "About Minimal", wxOK | wxICON_INFORMATION, this);
 195 }