// ----------------------------------------------------------------------------
#if defined(__GNUG__) && !defined(__APPLE__)
- #pragma implementation "erase.cpp"
- #pragma interface "erase.cpp"
+ #pragma implementation
+ #pragma interface
#endif
// For compilers that support precompilation, includes "wx/wx.h".
};
-class MyFrame : public wxFrame
+class MyCanvas : public wxScrolledWindow
{
public:
- MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
+ MyCanvas( wxFrame *parent );
- void OnQuit(wxCommandEvent& event);
- void OnAbout(wxCommandEvent& event);
+ void UseBuffer(bool useBuffer) { m_useBuffer = useBuffer; Refresh(); }
+ void EraseBg(bool eraseBg) { m_eraseBg = eraseBg; Refresh(); }
private:
- DECLARE_EVENT_TABLE()
-};
-
-
-class MyCanvas : public wxScrolledWindow
-{
-public:
- MyCanvas( MyFrame *parent );
-
void OnPaint( wxPaintEvent &event );
void OnChar( wxKeyEvent &event );
void OnEraseBackground( wxEraseEvent &event );
+ void DoPaint(wxDC& dc);
+
+
wxBitmap m_bitmap;
wxString m_text;
+ // use wxMemoryDC in OnPaint()?
+ bool m_useBuffer;
+
+ // paint custom background in OnEraseBackground()?
+ bool m_eraseBg;
+
+
+ DECLARE_EVENT_TABLE()
+};
+
+class MyFrame : public wxFrame
+{
+public:
+ MyFrame();
+
+ void OnUseBuffer(wxCommandEvent& event);
+ void OnEraseBg(wxCommandEvent& event);
+ void OnQuit(wxCommandEvent& event);
+ void OnAbout(wxCommandEvent& event);
+
private:
+ MyCanvas *m_canvas;
+
DECLARE_EVENT_TABLE()
};
+
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------
enum
{
// menu items
- ID_MENU_QUIT = 1,
+ Erase_Menu_UseBuffer = 100,
+ Erase_Menu_EraseBg,
+ Erase_Menu_Exit = wxID_EXIT,
+ Erase_Menu_About = wxID_ABOUT
};
bool MyApp::OnInit()
{
- MyFrame *frame = new MyFrame(_T("Erase sample"),
- wxPoint(50, 50), wxSize(450, 340));
+ MyFrame *frame = new MyFrame;
frame->Show(true);
// ----------------------------------------------------------------------------
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
- EVT_MENU(ID_MENU_QUIT, MyFrame::OnQuit)
- EVT_MENU(wxID_ABOUT, MyFrame::OnAbout)
+ EVT_MENU(Erase_Menu_UseBuffer, MyFrame::OnUseBuffer)
+ EVT_MENU(Erase_Menu_EraseBg, MyFrame::OnEraseBg)
+ EVT_MENU(Erase_Menu_Exit, MyFrame::OnQuit)
+ EVT_MENU(Erase_Menu_About, MyFrame::OnAbout)
END_EVENT_TABLE()
// frame constructor
-MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
- : wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size)
+MyFrame::MyFrame()
+ : wxFrame(NULL, wxID_ANY, _T("Erase sample"),
+ wxPoint(50, 50), wxSize(450, 340))
{
SetIcon(wxICON(mondrian));
wxMenu *menuFile = new wxMenu(_T(""), wxMENU_TEAROFF);
+ menuFile->AppendCheckItem(Erase_Menu_UseBuffer, _T("&Use memory DC\tCtrl-M"));
+ menuFile->AppendCheckItem(Erase_Menu_EraseBg, _T("Custom &background\tCtrl-B"));
+ menuFile->AppendSeparator();
+ menuFile->Append(Erase_Menu_Exit, _T("E&xit\tAlt-X"), _T("Quit this program"));
- wxMenu *helpMenu = new wxMenu;
- helpMenu->Append(wxID_ABOUT, _T("&About...\tCtrl-A"), _T("Show about dialog"));
- menuFile->Append(ID_MENU_QUIT, _T("E&xit\tAlt-X"), _T("Quit this program"));
+ wxMenu *helpMenu = new wxMenu;
+ helpMenu->Append(Erase_Menu_About, _T("&About...\tCtrl-A"), _T("Show about dialog"));
wxMenuBar *menuBar = new wxMenuBar();
menuBar->Append(menuFile, _T("&File"));
SetStatusText(_T("Welcome to wxWidgets erase sample!"));
#endif // wxUSE_STATUSBAR
- (void)new MyCanvas( this );
+ m_canvas = new MyCanvas( this );
+}
+
+
+void MyFrame::OnUseBuffer(wxCommandEvent& event)
+{
+ m_canvas->UseBuffer(event.IsChecked());
}
+void MyFrame::OnEraseBg(wxCommandEvent& event)
+{
+ m_canvas->EraseBg(event.IsChecked());
+}
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
EVT_ERASE_BACKGROUND( MyCanvas::OnEraseBackground)
END_EVENT_TABLE()
-MyCanvas::MyCanvas( MyFrame *parent )
+MyCanvas::MyCanvas( wxFrame *parent )
: wxScrolledWindow( parent, wxID_ANY, wxDefaultPosition, wxDefaultSize,
- wxScrolledWindowStyle |
- wxNO_FULL_REPAINT_ON_RESIZE|
- wxSUNKEN_BORDER )
+ wxScrolledWindowStyle | wxSUNKEN_BORDER )
{
+ m_eraseBg =
+ m_useBuffer = false;
+
SetScrollbars( 10, 10, 40, 100, 0, 0 );
m_bitmap = wxBitmap( wxICON(mondrian) );
new wxStaticBitmap( this, wxID_ANY, m_bitmap, wxPoint(80,20) );
+
+ SetFocusIgnoringChildren();
}
void MyCanvas::OnChar( wxKeyEvent &event )
case WXK_RETURN: m_text += wxT( "<ENTER>" ); break;
default: m_text += (wxChar)event.m_keyCode; break;
}
-
}
-void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
+void MyCanvas::DoPaint(wxDC& dc)
{
- wxPaintDC dc(this);
- PrepareDC( dc );
-
dc.SetBrush( *wxBLACK_BRUSH );
- dc.DrawRectangle( 0,0,200,50 );
+ dc.DrawRectangle( 10,10,200,50 );
dc.DrawBitmap( m_bitmap, 10, 20, true );
#endif // 0
}
+void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
+{
+ wxPaintDC dcWin(this);
+ PrepareDC( dcWin );
+
+ if ( m_useBuffer )
+ {
+ const wxSize size = GetClientSize();
+ wxMemoryDC dc;
+ wxBitmap bmp(size.x, size.y);
+ dc.SelectObject(bmp);
+ dc.Blit(0, 0, size.x, size.y, &dcWin, 0, 0);
+ dc.DrawText(_T("(copy of background)"), 5, 120 );
+
+ DoPaint(dc);
+
+ dcWin.Blit(0, 0, size.x, size.y, &dc, 0, 0);
+ }
+ else
+ {
+ DoPaint(dcWin);
+ }
+}
+
void MyCanvas::OnEraseBackground( wxEraseEvent& event )
{
+ if ( !m_eraseBg )
+ {
+ event.Skip();
+ return;
+ }
+
wxDC& dc = *event.GetDC();
dc.SetPen(*wxGREEN_PEN);
- // this line is needed, otherwise the junk is left on win the background
+ PrepareDC( dc );
+
+ // clear any junk currently displayed
dc.Clear();
- wxSize size = GetClientSize();
- for ( int x = 0; x < size.x; x+= 10 )
+ const wxSize size = GetClientSize();
+ for ( int x = 0; x < size.x; x += 15 )
{
dc.DrawLine(x, 0, x, size.y);
}
- for ( int y = 0; y < size.y; y+= 10 )
+ for ( int y = 0; y < size.y; y += 15 )
{
dc.DrawLine(0, y, size.x, y);
}
dc.SetTextForeground(*wxRED);
- dc.DrawText(_T("This text is drawn from OnEraseBackground"), 60, 60);
+ dc.DrawText(_T("This text is drawn from OnEraseBackground"), 60, 160);
}
projects / wxWidgets.git / blobdiff