X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/07850a495081697fe2825eafb656926c676aa279..1db8f1dc4a13dc47f3f9099dd398acaee7c5f9e5:/samples/erase/erase.cpp diff --git a/samples/erase/erase.cpp b/samples/erase/erase.cpp index 166f7e1008..94dd570ec4 100644 --- a/samples/erase/erase.cpp +++ b/samples/erase/erase.cpp @@ -17,11 +17,6 @@ // headers // ---------------------------------------------------------------------------- -#if defined(__GNUG__) && !defined(__APPLE__) - #pragma implementation "erase.cpp" - #pragma interface "erase.cpp" -#endif - // For compilers that support precompilation, includes "wx/wx.h". #include "wx/wxprec.h" @@ -54,35 +49,52 @@ public: }; -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 // ---------------------------------------------------------------------------- @@ -90,7 +102,10 @@ private: enum { // menu items - ID_MENU_QUIT = 1, + Erase_Menu_UseBuffer = 100, + Erase_Menu_EraseBg, + Erase_Menu_Exit = wxID_EXIT, + Erase_Menu_About = wxID_ABOUT }; @@ -102,8 +117,10 @@ IMPLEMENT_APP(MyApp) bool MyApp::OnInit() { - MyFrame *frame = new MyFrame(_T("Erase sample"), - wxPoint(50, 50), wxSize(450, 340)); + if ( !wxApp::OnInit() ) + return false; + + MyFrame *frame = new MyFrame; frame->Show(true); @@ -115,22 +132,28 @@ bool MyApp::OnInit() // ---------------------------------------------------------------------------- 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")); @@ -144,9 +167,19 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size) 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)) { @@ -166,17 +199,20 @@ BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow) 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 ) @@ -198,24 +234,20 @@ void MyCanvas::OnChar( wxKeyEvent &event ) case WXK_RIGHT: m_text += wxT( "" ); break; case WXK_DOWN: m_text += wxT( "" ); break; case WXK_RETURN: m_text += wxT( "" ); break; - default: m_text += event.m_keyCode; 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 ); dc.SetTextForeground(*wxBLUE); dc.DrawText(_T("This text is drawn from OnPaint"), 65, 65); - + wxString tmp; tmp.Printf( _T("Hit any key to display more text: %s"), m_text.c_str() ); int w,h; @@ -271,26 +303,58 @@ void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) ) #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); }