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 #include "wx/dynarray.h"
  39
  40 WX_DEFINE_ARRAY(wxWindow *, wxArrayLboxes);
  41
  42 // ----------------------------------------------------------------------------
  43 // resources
  44 // ----------------------------------------------------------------------------
  45 // the application icon
  46 #if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__)
  47     #include "mondrian.xpm"
  48 #endif
  49
  50 // ----------------------------------------------------------------------------
  51 // private classes
  52 // ----------------------------------------------------------------------------
  53
  54 // Define a new application type, each program should derive a class from wxApp
  55 class MyApp : public wxApp
  56 {
  57 public:
  58     // override base class virtuals
  59     // ----------------------------
  60
  61     // this one is called on application startup and is a good place for the app
  62     // initialization (doing it here and not in the ctor allows to have an error
  63     // return: if OnInit() returns false, the application terminates)
  64     virtual bool OnInit();
  65 };
  66
  67 // Define a new frame type: this is going to be our main frame
  68 class MyFrame : public wxFrame
  69 {
  70 public:
  71     // ctor(s)
  72     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  73
  74     // event handlers (these functions should _not_ be virtual)
  75     void OnQuit(wxCommandEvent& event);
  76     void OnAbout(wxCommandEvent& event);
  77     void OnCreateLbox(wxCommandEvent& event);
  78     void OnDeleteLbox(wxCommandEvent& event);
  79
  80 private:
  81     wxArrayLboxes m_lboxes;
  82     wxCoord m_pos;
  83
  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     Minimal_CreateLbox,
  99     Minimal_DeleteLbox,
 100 };
 101
 102 static const size_t NUM_LBOXES = 10;
 103 static const wxCoord POS_STEP = 5;
 104
 105 // ----------------------------------------------------------------------------
 106 // event tables and other macros for wxWindows
 107 // ----------------------------------------------------------------------------
 108
 109 // the event tables connect the wxWindows events with the functions (event
 110 // handlers) which process them. It can be also done at run-time, but for the
 111 // simple menu events like this the static method is much simpler.
 112 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 113     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 114     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 115     EVT_MENU(Minimal_CreateLbox, MyFrame::OnCreateLbox)
 116     EVT_MENU(Minimal_DeleteLbox, MyFrame::OnDeleteLbox)
 117 END_EVENT_TABLE()
 118
 119 // Create a new application object: this macro will allow wxWindows to create
 120 // the application object during program execution (it's better than using a
 121 // static object for many reasons) and also declares the accessor function
 122 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 123 // not wxApp)
 124 IMPLEMENT_APP(MyApp)
 125
 126 // ============================================================================
 127 // implementation
 128 // ============================================================================
 129
 130 // ----------------------------------------------------------------------------
 131 // the application class
 132 // ----------------------------------------------------------------------------
 133
 134 // 'Main program' equivalent: the program execution "starts" here
 135 bool MyApp::OnInit()
 136 {
 137     // create the main application window
 138     MyFrame *frame = new MyFrame("Minimal wxWindows App",
 139                                  wxPoint(50, 50), wxSize(450, 340));
 140
 141     // and show it (the frames, unlike simple controls, are not shown when
 142     // created initially)
 143     frame->Show(TRUE);
 144
 145     // success: wxApp::OnRun() will be called which will enter the main message
 146     // loop and the application will run. If we returned FALSE here, the
 147     // application would exit immediately.
 148     return TRUE;
 149 }
 150
 151 // ----------------------------------------------------------------------------
 152 // main frame
 153 // ----------------------------------------------------------------------------
 154
 155 // frame constructor
 156 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 157        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 158 {
 159     m_pos = 0;
 160
 161 #ifdef __WXMAC__
 162     // we need this in order to allow the about menu relocation, since ABOUT is
 163     // not the default id of the about menu
 164     wxApp::s_macAboutMenuItemId = Minimal_About;
 165 #endif
 166
 167     // set the frame icon
 168     SetIcon(wxICON(mondrian));
 169
 170 #if wxUSE_MENUS
 171     // create a menu bar
 172     wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
 173
 174     // the "About" item should be in the help menu
 175     wxMenu *helpMenu = new wxMenu;
 176     helpMenu->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
 177     helpMenu->Append(Minimal_CreateLbox, "&Create 10 listboxes\tCtrl-C");
 178     helpMenu->Append(Minimal_DeleteLbox, "&Delete 10 listboxes\tCtrl-D");
 179
 180     menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 181
 182     // now append the freshly created menu to the menu bar...
 183     wxMenuBar *menuBar = new wxMenuBar();
 184     menuBar->Append(menuFile, "&File");
 185     menuBar->Append(helpMenu, "&Help");
 186
 187     // ... and attach this menu bar to the frame
 188     SetMenuBar(menuBar);
 189 #endif // wxUSE_MENUS
 190
 191 #if wxUSE_STATUSBAR
 192     // create a status bar just for fun (by default with 1 pane only)
 193     CreateStatusBar(2);
 194     SetStatusText("Welcome to wxWindows!");
 195 #endif // wxUSE_STATUSBAR
 196 }
 197
 198
 199 // event handlers
 200
 201 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 202 {
 203     // TRUE is to force the frame to close
 204     Close(TRUE);
 205 }
 206
 207 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 208 {
 209     wxString msg;
 210     msg.Printf( _T("This is the about dialog of minimal sample.\n")
 211                 _T("Welcome to %s"), wxVERSION_STRING);
 212
 213     wxMessageBox(msg, "About Minimal", wxOK | wxICON_INFORMATION, this);
 214 }
 215
 216 void MyFrame::OnCreateLbox(wxCommandEvent& WXUNUSED(event))
 217 {
 218     for ( size_t n = 0; n < NUM_LBOXES; n++ )
 219     {
 220         m_lboxes.Add(new wxListBox(this, -1, wxPoint(m_pos, m_pos)));
 221         m_pos += POS_STEP;
 222     }
 223 }
 224
 225 void MyFrame::OnDeleteLbox(wxCommandEvent& WXUNUSED(event))
 226 {
 227     size_t count = m_lboxes.GetCount();
 228     if ( count < NUM_LBOXES )
 229         return;
 230
 231     for ( size_t n = 0; n < NUM_LBOXES; n++ )
 232     {
 233         delete m_lboxes[--count];
 234         m_lboxes.RemoveAt(count);
 235
 236         m_pos -= POS_STEP;
 237     }
 238 }
 239