1 /////////////////////////////////////////////////////////////////////////////
3 // Purpose: Erase wxWindows sample
4 // Author: Robert Roebling
8 // Copyright: (c) Robert Roebling
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
12 // ============================================================================
14 // ============================================================================
16 // ----------------------------------------------------------------------------
18 // ----------------------------------------------------------------------------
21 #pragma implementation "erase.cpp"
22 #pragma interface "erase.cpp"
25 // For compilers that support precompilation, includes "wx/wx.h".
26 #include "wx/wxprec.h"
32 // for all others, include the necessary headers (this file is usually all you
33 // need because it includes almost all "standard" wxWindows headers)
38 // ----------------------------------------------------------------------------
40 // ----------------------------------------------------------------------------
41 // the application icon
42 #if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__) || defined(__WXX11__)
43 #include "mondrian.xpm"
46 // ----------------------------------------------------------------------------
48 // ----------------------------------------------------------------------------
50 class MyApp
: public wxApp
53 virtual bool OnInit();
57 class MyFrame
: public wxFrame
60 MyFrame(const wxString
& title
, const wxPoint
& pos
, const wxSize
& size
);
62 void OnQuit(wxCommandEvent
& event
);
63 void OnAbout(wxCommandEvent
& event
);
70 class MyCanvas
: public wxScrolledWindow
73 MyCanvas( MyFrame
*parent
);
75 void OnPaint( wxPaintEvent
&event
);
76 void OnEraseBackground( wxEraseEvent
&event
);
84 // ----------------------------------------------------------------------------
86 // ----------------------------------------------------------------------------
95 // ----------------------------------------------------------------------------
96 // the application class
97 // ----------------------------------------------------------------------------
103 MyFrame
*frame
= new MyFrame(_T("Erase sample"),
104 wxPoint(50, 50), wxSize(450, 340));
111 // ----------------------------------------------------------------------------
113 // ----------------------------------------------------------------------------
115 BEGIN_EVENT_TABLE(MyFrame
, wxFrame
)
116 EVT_MENU(ID_MENU_QUIT
, MyFrame::OnQuit
)
117 EVT_MENU(wxID_ABOUT
, MyFrame::OnAbout
)
121 MyFrame::MyFrame(const wxString
& title
, const wxPoint
& pos
, const wxSize
& size
)
122 : wxFrame((wxFrame
*)NULL
, -1, title
, pos
, size
)
124 SetIcon(wxICON(mondrian
));
126 wxMenu
*menuFile
= new wxMenu("", wxMENU_TEAROFF
);
128 wxMenu
*helpMenu
= new wxMenu
;
129 helpMenu
->Append(wxID_ABOUT
, _T("&About...\tCtrl-A"), _T("Show about dialog"));
131 menuFile
->Append(ID_MENU_QUIT
, _T("E&xit\tAlt-X"), _T("Quit this program"));
133 wxMenuBar
*menuBar
= new wxMenuBar();
134 menuBar
->Append(menuFile
, _T("&File"));
135 menuBar
->Append(helpMenu
, _T("&Help"));
140 // create a status bar just for fun (by default with 1 pane only)
142 SetStatusText(_T("Welcome to wxWindows erase sample!"));
143 #endif // wxUSE_STATUSBAR
145 (void)new MyCanvas( this );
149 void MyFrame::OnQuit(wxCommandEvent
& WXUNUSED(event
))
154 void MyFrame::OnAbout(wxCommandEvent
& WXUNUSED(event
))
156 wxMessageBox(_T("This sample shows how you can draw custom background."),
157 _T("About Erase Sample"), wxOK
| wxICON_INFORMATION
, this);
161 BEGIN_EVENT_TABLE(MyCanvas
, wxScrolledWindow
)
162 EVT_PAINT( MyCanvas::OnPaint
)
163 EVT_ERASE_BACKGROUND( MyCanvas::OnEraseBackground
)
166 MyCanvas::MyCanvas( MyFrame
*parent
)
167 : wxScrolledWindow( parent
, -1, wxDefaultPosition
, wxDefaultSize
,
168 wxScrolledWindowStyle
|
169 wxNO_FULL_REPAINT_ON_RESIZE
|
172 SetScrollbars( 10, 10, 40, 100, 0, 0 );
174 m_bitmap
= wxBitmap( wxICON(mondrian
) );
176 new wxStaticBitmap( this, -1, m_bitmap
, wxPoint(80,20) );
179 void MyCanvas::OnPaint( wxPaintEvent
&event
)
184 dc
.SetBrush( *wxBLACK_BRUSH
);
185 dc
.DrawRectangle( 0,0,200,50 );
187 dc
.DrawBitmap( m_bitmap
, 10, 20, TRUE
);
189 dc
.SetTextForeground(*wxBLUE
);
190 dc
.DrawText(_T("This text is drawn from OnPaint"), 65, 65);
193 wxRegionIterator
upd( GetUpdateRegion() );
196 wxLogDebug( "Paint: %d %d %d %d", upd
.GetX(), upd
.GetY(), upd
.GetWidth(), upd
.GetHeight() );
202 wxSize size
= GetSize();
203 wxSize client_size
= GetClientSize();
204 wxLogDebug( "size %d %d client_size %d %d", size
.x
, size
.y
, client_size
.x
, client_size
.y
);
209 dc
.SetPen( *wxWHITE_PEN
);
210 for (i
= 0; i
< 20; i
+= 2)
211 dc
.DrawLine( i
,i
, i
+100,i
);
213 dc
.SetPen( *wxWHITE_PEN
);
214 for (i
= 200; i
< 220; i
+= 2)
215 dc
.DrawLine( i
-200,i
, i
-100,i
);
217 wxRegion
region( 110, 110, 80, 80 );
218 wxRegion
hole( 130, 130, 40, 1 );
219 region
.Intersect( hole
);
220 dc
.SetClippingRegion( region
);
222 dc
.SetBrush( *wxRED_BRUSH
);
223 dc
.DrawRectangle( 100, 100, 200, 200 );
225 dc
.DestroyClippingRegion();
227 dc
.SetPen( *wxTRANSPARENT_PEN
);
229 wxRegion
strip( 110, 200, 30, 1 );
230 wxRegionIterator
it( strip
);
233 dc
.DrawRectangle( it
.GetX(), it
.GetY(), it
.GetWidth(), it
.GetHeight() );
239 void MyCanvas::OnEraseBackground( wxEraseEvent
& event
)
241 wxDC
& dc
= *event
.GetDC();
242 dc
.SetPen(*wxGREEN_PEN
);
244 // this line is needed, otherwise the junk is left on win the background
247 wxSize size
= GetClientSize();
248 for ( int x
= 0; x
< size
.x
; x
+= 10 )
250 dc
.DrawLine(x
, 0, x
, size
.y
);
253 for ( int y
= 0; y
< size
.y
; y
+= 10 )
255 dc
.DrawLine(0, y
, size
.x
, y
);
258 dc
.SetTextForeground(*wxRED
);
259 dc
.DrawText(_T("This text is drawn from OnEraseBackground"), 60, 60);