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 and Markus Holzem
   9 // Licence:     wxWindows license
  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 #ifdef __WXGTK__
  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     // controls start here (the numbers are, of course, arbitrary)
  90     Minimal_Text = 1000,
  91 };
  92
  93 // ----------------------------------------------------------------------------
  94 // event tables and other macros for wxWindows
  95 // ----------------------------------------------------------------------------
  96
  97 // the event tables connect the wxWindows events with the functions (event
  98 // handlers) which process them. It can be also done at run-time, but for the
  99 // simple menu events like this the static method is much simpler.
 100 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 101     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 102     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 103 END_EVENT_TABLE()
 104
 105 // Create a new application object: this macro will allow wxWindows to create
 106 // the application object during program execution (it's better than using a
 107 // static object for many reasons) and also declares the accessor function
 108 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 109 // not wxApp)
 110 IMPLEMENT_APP(MyApp)
 111
 112 // ============================================================================
 113 // implementation
 114 // ============================================================================
 115
 116 // ----------------------------------------------------------------------------
 117 // the application class
 118 // ----------------------------------------------------------------------------
 119
 120 // `Main program' equivalent: the program execution "starts" here
 121 bool MyApp::OnInit()
 122 {
 123     // Create the main application window
 124     MyFrame *frame = new MyFrame("Minimal wxWindows App",
 125                                  wxPoint(50, 50), wxSize(450, 340));
 126
 127     // Show it and tell the application that it's our main window
 128     // @@@ what does it do exactly, in fact? is it necessary here?
 129     frame->Show(TRUE);
 130     SetTopWindow(frame);
 131
 132     // success: wxApp::OnRun() will be called which will enter the main message
 133     // loop and the application will run. If we returned FALSE here, the
 134     // application would exit immediately.
 135     return TRUE;
 136 }
 137
 138 // ----------------------------------------------------------------------------
 139 // main frame
 140 // ----------------------------------------------------------------------------
 141
 142 // frame constructor
 143 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 144        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 145 {
 146     // set the frame icon
 147     SetIcon(wxICON(mondrian));
 148
 149     // create a menu bar
 150     wxMenu *menuFile = new wxMenu;
 151
 152     menuFile->Append(Minimal_About, "&About...");
 153     menuFile->AppendSeparator();
 154     menuFile->Append(Minimal_Quit, "E&xit");
 155
 156     // now append the freshly created menu to the menu bar...
 157     wxMenuBar *menuBar = new wxMenuBar;
 158     menuBar->Append(menuFile, "&File");
 159
 160     // ... and attach this menu bar to the frame
 161     SetMenuBar(menuBar);
 162
 163     // create a status bar just for fun (by default with 1 pane only)
 164     CreateStatusBar();
 165     SetStatusText("Welcome to wxWindows!");
 166
 167     // now create some controls
 168
 169     // a panel first - if there were several controls, it would allow us to
 170     // navigate between them from the keyboard
 171     wxPanel *panel = new wxPanel(this, -1, wxPoint(0, 0), wxSize(400, 200));
 172
 173     // and a static control whose parent is the panel
 174     (void)new wxStaticText(panel, -1, "Hello, world!", wxPoint(10, 10));
 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("This is a minimal sample\nA second line in the message box",
 189                  "About Minimal", wxOK | wxICON_INFORMATION, this);
 190 }