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 // resources
  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 OnPaint(wxPaintEvent& event)
  71     {
  72         wxPaintDC dc(this);
  73         dc.DrawRectangle(20, 20, 100, 100);
  74         dc.SetPen(*wxRED_PEN);
  75         dc.SetDeviceOrigin(20, 20);
  76         dc.SetClippingRegion(0, 0, 100, 100);
  77         dc.DrawLine(0, 0, 1000, 1000);
  78     }
  79
  80     void OnQuit(wxCommandEvent& event);
  81     void OnAbout(wxCommandEvent& event);
  82
  83 private:
  84     // any class wishing to process wxWindows events must use this macro
  85     DECLARE_EVENT_TABLE()
  86 };
  87
  88 // ----------------------------------------------------------------------------
  89 // constants
  90 // ----------------------------------------------------------------------------
  91
  92 // IDs for the controls and the menu commands
  93 enum
  94 {
  95     // menu items
  96     Minimal_Quit = 1,
  97     Minimal_About
  98 };
  99
 100 // ----------------------------------------------------------------------------
 101 // event tables and other macros for wxWindows
 102 // ----------------------------------------------------------------------------
 103
 104 // the event tables connect the wxWindows events with the functions (event
 105 // handlers) which process them. It can be also done at run-time, but for the
 106 // simple menu events like this the static method is much simpler.
 107 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 108     EVT_PAINT(MyFrame::OnPaint)
 109     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 110     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 111 END_EVENT_TABLE()
 112
 113 // Create a new application object: this macro will allow wxWindows to create
 114 // the application object during program execution (it's better than using a
 115 // static object for many reasons) and also declares the accessor function
 116 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 117 // not wxApp)
 118 IMPLEMENT_APP(MyApp)
 119
 120 // ============================================================================
 121 // implementation
 122 // ============================================================================
 123
 124 // ----------------------------------------------------------------------------
 125 // the application class
 126 // ----------------------------------------------------------------------------
 127
 128 // 'Main program' equivalent: the program execution "starts" here
 129 bool MyApp::OnInit()
 130 {
 131     // create the main application window
 132     MyFrame *frame = new MyFrame("Minimal wxWindows App",
 133                                  wxPoint(50, 50), wxSize(450, 340));
 134
 135     // and show it (the frames, unlike simple controls, are not shown when
 136     // created initially)
 137     frame->Show(TRUE);
 138
 139     // success: wxApp::OnRun() will be called which will enter the main message
 140     // loop and the application will run. If we returned FALSE here, the
 141     // application would exit immediately.
 142     return TRUE;
 143 }
 144
 145 // ----------------------------------------------------------------------------
 146 // main frame
 147 // ----------------------------------------------------------------------------
 148
 149 // frame constructor
 150 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 151        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 152 {
 153 #ifdef __WXMAC__
 154     // we need this in order to allow the about menu relocation, since ABOUT is
 155     // not the default id of the about menu
 156     wxApp::s_macAboutMenuItemId = Minimal_About;
 157 #endif
 158
 159     // set the frame icon
 160     SetIcon(wxICON(mondrian));
 161
 162     // create a menu bar
 163     wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
 164
 165     // the "About" item should be in the help menu
 166     wxMenu *helpMenu = new wxMenu;
 167     helpMenu->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
 168
 169     menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 170
 171     // now append the freshly created menu to the menu bar...
 172     wxMenuBar *menuBar = new wxMenuBar();
 173     menuBar->Append(menuFile, "&File");
 174     menuBar->Append(helpMenu, "&Help");
 175
 176     // ... and attach this menu bar to the frame
 177     SetMenuBar(menuBar);
 178
 179 #if wxUSE_STATUSBAR
 180     // create a status bar just for fun (by default with 1 pane only)
 181     CreateStatusBar(2);
 182     SetStatusText("Welcome to wxWindows!");
 183 #endif // wxUSE_STATUSBAR
 184 }
 185
 186
 187 // event handlers
 188
 189 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 190 {
 191     // TRUE is to force the frame to close
 192     Close(TRUE);
 193 }
 194
 195 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 196 {
 197     wxString msg;
 198     msg.Printf( _T("This is the about dialog of minimal sample.\n")
 199                 _T("Welcome to %s"), wxVERSION_STRING);
 200
 201     wxMessageBox(msg, "About Minimal", wxOK | wxICON_INFORMATION, this);
 202 }