samples/erase/erase.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        erase.cpp
   3 // Purpose:     Erase wxWindows sample
   4 // Author:      Robert Roebling
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "erase.cpp"
  22     #pragma interface "erase.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__) || defined(__WXMGL__) || defined(__WXX11__)
  43     #include "mondrian.xpm"
  44 #endif
  45
  46 // ----------------------------------------------------------------------------
  47 // private classes
  48 // ----------------------------------------------------------------------------
  49
  50 class MyApp : public wxApp
  51 {
  52 public:
  53     virtual bool OnInit();
  54 };
  55
  56
  57 class MyFrame : public wxFrame
  58 {
  59 public:
  60     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  61
  62     void OnQuit(wxCommandEvent& event);
  63     void OnAbout(wxCommandEvent& event);
  64
  65 private:
  66     DECLARE_EVENT_TABLE()
  67 };
  68
  69
  70 class MyCanvas : public wxScrolledWindow
  71 {
  72 public:
  73     MyCanvas( MyFrame *parent );
  74
  75     void OnPaint( wxPaintEvent &event );
  76     void OnEraseBackground( wxEraseEvent &event );
  77
  78 private:
  79     DECLARE_EVENT_TABLE()
  80 };
  81
  82 // ----------------------------------------------------------------------------
  83 // constants
  84 // ----------------------------------------------------------------------------
  85
  86 enum
  87 {
  88     // menu items
  89     Minimal_Quit = 1,
  90     Minimal_About
  91 };
  92
  93
  94 // ----------------------------------------------------------------------------
  95 // the application class
  96 // ----------------------------------------------------------------------------
  97
  98 IMPLEMENT_APP(MyApp)
  99
 100 bool MyApp::OnInit()
 101 {
 102     MyFrame *frame = new MyFrame("Minimal wxWindows App",
 103                                  wxPoint(50, 50), wxSize(450, 340));
 104
 105     frame->Show(TRUE);
 106
 107     return TRUE;
 108 }
 109
 110 // ----------------------------------------------------------------------------
 111 // main frame
 112 // ----------------------------------------------------------------------------
 113
 114 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 115     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 116     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 117 END_EVENT_TABLE()
 118
 119 // frame constructor
 120 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 121        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 122 {
 123 #ifdef __WXMAC__
 124     wxApp::s_macAboutMenuItemId = Minimal_About;
 125 #endif
 126
 127     SetIcon(wxICON(mondrian));
 128
 129     wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
 130
 131     wxMenu *helpMenu = new wxMenu;
 132     helpMenu->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
 133
 134     menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 135
 136     wxMenuBar *menuBar = new wxMenuBar();
 137     menuBar->Append(menuFile, "&File");
 138     menuBar->Append(helpMenu, "&Help");
 139
 140     SetMenuBar(menuBar);
 141
 142 #if wxUSE_STATUSBAR
 143     // create a status bar just for fun (by default with 1 pane only)
 144     CreateStatusBar(2);
 145     SetStatusText("Welcome to wxWindows!");
 146 #endif // wxUSE_STATUSBAR
 147
 148     (void)new MyCanvas( this );
 149 }
 150
 151
 152 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 153 {
 154     Close(TRUE);
 155 }
 156
 157 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 158 {
 159     wxString msg;
 160     msg.Printf( _T("This is the about dialog of the Erase sample.\n")
 161                 _T("Welcome to %s"), wxVERSION_STRING);
 162
 163     wxMessageBox(msg, "About Erase", wxOK | wxICON_INFORMATION, this);
 164 }
 165
 166
 167 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
 168     EVT_PAINT(  MyCanvas::OnPaint)
 169     EVT_ERASE_BACKGROUND(  MyCanvas::OnEraseBackground)
 170 END_EVENT_TABLE()
 171
 172 MyCanvas::MyCanvas( MyFrame *parent )
 173  : wxScrolledWindow( parent, -1, wxDefaultPosition, wxDefaultSize,
 174                     wxScrolledWindowStyle|wxNO_FULL_REPAINT_ON_RESIZE )
 175 {
 176     SetScrollbars( 10, 10, 40, 100, 0, 0 );
 177 }
 178
 179 void MyCanvas::OnPaint( wxPaintEvent &event )
 180 {
 181     wxPaintDC dc(this);
 182     PrepareDC( dc );
 183
 184     wxRegion region( 110, 110, 80, 80 );
 185     wxRegion hole( 130, 130, 40, 1 );
 186     region.Intersect( hole );
 187     dc.SetClippingRegion( region );
 188
 189     dc.SetBrush( *wxRED_BRUSH );
 190     dc.DrawRectangle( 100, 100, 200, 200 );
 191
 192     dc.DestroyClipingRegion();
 193
 194     dc.SetPen( *wxTRANSPARENT_PEN );
 195
 196     wxRegion strip( 110, 200, 30, 1 );
 197     wxRegionIterator it( strip );
 198     while (it)
 199     {
 200         dc.DrawRectangle( it.GetX(), it.GetY(), it.GetWidth(), it.GetHeight() );
 201         it ++;
 202     }
 203 }
 204
 205 void MyCanvas::OnEraseBackground( wxEraseEvent &event )
 206 {
 207     event.Skip( TRUE );
 208 }
 209