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     void OnTest(wxCommandEvent& event);
  73
  74     void OnPaint(wxPaintEvent& event);
  75
  76 private:
  77     // any class wishing to process wxWindows events must use this macro
  78     DECLARE_EVENT_TABLE()
  79 };
  80
  81 // ----------------------------------------------------------------------------
  82 // constants
  83 // ----------------------------------------------------------------------------
  84
  85 // IDs for the controls and the menu commands
  86 enum
  87 {
  88     // menu items
  89     Minimal_Quit = 1,
  90     Minimal_About,
  91     Minimal_Test,
  92
  93     // controls start here (the numbers are, of course, arbitrary)
  94     Minimal_Text = 1000,
  95 };
  96
  97 // ----------------------------------------------------------------------------
  98 // event tables and other macros for wxWindows
  99 // ----------------------------------------------------------------------------
 100
 101 // the event tables connect the wxWindows events with the functions (event
 102 // handlers) which process them. It can be also done at run-time, but for the
 103 // simple menu events like this the static method is much simpler.
 104 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 105     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 106     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 107
 108     EVT_MENU(Minimal_Test, MyFrame::OnTest)
 109
 110     EVT_PAINT(MyFrame::OnPaint)
 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     // Show it and tell the application that it's our main window
 136     // @@@ what does it do exactly, in fact? is it necessary here?
 137     frame->Show(TRUE);
 138     SetTopWindow(frame);
 139
 140     // success: wxApp::OnRun() will be called which will enter the main message
 141     // loop and the application will run. If we returned FALSE here, the
 142     // application would exit immediately.
 143     return TRUE;
 144 }
 145
 146 // ----------------------------------------------------------------------------
 147 // main frame
 148 // ----------------------------------------------------------------------------
 149
 150 // frame constructor
 151 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 152        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 153 {
 154     // set the frame icon
 155     SetIcon(wxICON(mondrian));
 156
 157     // create a menu bar
 158     wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
 159
 160     menuFile->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
 161     menuFile->Append(Minimal_Test, "&Test...\tCtrl-T", "Test");
 162     menuFile->AppendSeparator();
 163     menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 164
 165     // now append the freshly created menu to the menu bar...
 166     wxMenuBar *menuBar = new wxMenuBar();
 167     menuBar->Append(menuFile, "&File");
 168
 169     // ... and attach this menu bar to the frame
 170     SetMenuBar(menuBar);
 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")
 193 #ifdef wxBETA_NUMBER
 194                _T(" (beta %d)!")
 195 #endif // wxBETA_NUMBER
 196                , wxVERSION_STRING
 197 #ifdef wxBETA_NUMBER
 198                , wxBETA_NUMBER
 199 #endif // wxBETA_NUMBER
 200               );
 201
 202     wxMessageBox(msg, "About Minimal", wxOK | wxICON_INFORMATION, this);
 203 }
 204
 205 struct Foo
 206 {
 207     Foo(int n_) { n = n_; }
 208
 209     int n;
 210 };
 211
 212 WX_DECLARE_LIST(Foo, FooList);
 213
 214 #include <wx/listimpl.cpp>
 215
 216 WX_DEFINE_LIST(FooList);
 217
 218 int FooSort(const Foo **item1, const Foo **item2)
 219 {
 220     return (*item2)->n - (*item1)->n;
 221 }
 222
 223 void ShowList(const FooList& list)
 224 {
 225     wxString msg, str;
 226     msg = "The list elements: (";
 227     for ( FooList::Node *node = list.GetFirst(); node; node = node->GetNext() )
 228     {
 229         if ( !!str )
 230             msg += ", ";
 231         str.Printf("%d", node->GetData()->n);
 232         msg += str;
 233     }
 234
 235     msg += ')';
 236
 237     wxMessageBox(msg, "List contents", wxOK | wxICON_INFORMATION);
 238 }
 239
 240 void MyFrame::OnTest(wxCommandEvent& event)
 241 {
 242     FooList list;
 243     list.Append(new Foo(12));
 244     list.Append(new Foo(3));
 245     list.Append(new Foo(1));
 246     list.Append(new Foo(7));
 247     list.Append(new Foo(4));
 248     ShowList(list);
 249     list.Sort(FooSort);
 250     ShowList(list);
 251 }
 252
 253 void MyFrame::OnPaint(wxPaintEvent& event)
 254 {
 255     wxPaintDC dc(this);
 256
 257     wxMemoryDC dcMem;
 258     wxSize size(GetClientSize());
 259     dcMem.SelectObject(wxBitmap(size.x, size.y, -1));
 260
 261     dcMem.SetBackground(wxBrush(wxColour(0, 0, 255), wxSOLID));
 262     dcMem.SetTextForeground(wxColour(0, 255, 0));
 263     dcMem.SetTextBackground(wxColour(0, 0, 0));
 264     dcMem.SetBackgroundMode(wxSOLID);
 265     dcMem.Clear();
 266     dcMem.DrawText("Hello, wxWindows!", 10, 10);
 267
 268     wxPoint ptOrig(0, 0);
 269     dc.Blit(ptOrig, size, &dcMem, ptOrig);
 270
 271     dcMem.SelectObject(wxNullBitmap);
 272 }