X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f566b4fe822694a0b33e490edb730ede39d731ad..9e96e16fe0bc7af32d329c965ad110a3e5be5ad8:/samples/erase/erase.cpp diff --git a/samples/erase/erase.cpp b/samples/erase/erase.cpp index eeddaad927..d00ccf0de3 100644 --- a/samples/erase/erase.cpp +++ b/samples/erase/erase.cpp @@ -1,11 +1,11 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: erase.cpp -// Purpose: Erase wxWindows sample -// Author: Robert Roebling -// Modified by: +// Name: samples/erase/erase.cpp +// Purpose: Erase wxWidgets sample +// Author: Robert Roebling, Vadim Zeitlin // Created: 04/01/98 // RCS-ID: $Id$ -// Copyright: (c) Robert Roebling +// Copyright: (c) 1998 Robert Roebling +// (c) 2009 Vadim Zeitlin // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// @@ -17,11 +17,6 @@ // headers // ---------------------------------------------------------------------------- -#ifdef __GNUG__ - #pragma implementation "erase.cpp" - #pragma interface "erase.cpp" -#endif - // For compilers that support precompilation, includes "wx/wx.h". #include "wx/wxprec.h" @@ -30,11 +25,13 @@ #endif // for all others, include the necessary headers (this file is usually all you -// need because it includes almost all "standard" wxWindows headers) +// need because it includes almost all "standard" wxWidgets headers) #ifndef WX_PRECOMP #include "wx/wx.h" #endif +#include "wx/dcbuffer.h" + // ---------------------------------------------------------------------------- // resources // ---------------------------------------------------------------------------- @@ -54,31 +51,66 @@ 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(); } + bool UsesBuffer() const { return m_useBuffer; } + + void EraseBgInPaint(bool erase) { m_eraseBgInPaint = erase; Refresh(); } private: + 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; + + // erase background in OnPaint()? + bool m_eraseBgInPaint; + + DECLARE_EVENT_TABLE() }; - -class MyCanvas : public wxScrolledWindow +class MyFrame : public wxFrame { public: - MyCanvas( MyFrame *parent ); - - void OnPaint( wxPaintEvent &event ); - void OnEraseBackground( wxEraseEvent &event ); + MyFrame(); private: + void OnUseBuffer(wxCommandEvent& event); + void OnEraseBgInPaint(wxCommandEvent& event); + void OnChangeBgStyle(wxCommandEvent& event); + void OnQuit(wxCommandEvent& event); + void OnAbout(wxCommandEvent& event); + + // we can only use double-buffering with wxBG_STYLE_PAINT + void OnUpdateUIUseBuffer(wxUpdateUIEvent& event) + { + event.Enable( m_canvas->GetBackgroundStyle() == wxBG_STYLE_PAINT ); + } + + void OnUpdateUIChangeBgStyle(wxUpdateUIEvent& event) + { + event.Enable( !m_canvas->UsesBuffer() ); + } + + MyCanvas *m_canvas; + DECLARE_EVENT_TABLE() }; + // ---------------------------------------------------------------------------- // constants // ---------------------------------------------------------------------------- @@ -86,8 +118,13 @@ private: enum { // menu items - Minimal_Quit = 1, - Minimal_About + Erase_Menu_UseBuffer = 100, + Erase_Menu_EraseBgInPaint, + Erase_Menu_BgStyleErase, + Erase_Menu_BgStyleSystem, + Erase_Menu_BgStylePaint, + Erase_Menu_Exit = wxID_EXIT, + Erase_Menu_About = wxID_ABOUT }; @@ -99,12 +136,14 @@ IMPLEMENT_APP(MyApp) bool MyApp::OnInit() { - MyFrame *frame = new MyFrame("Minimal wxWindows App", - wxPoint(50, 50), wxSize(450, 340)); + if ( !wxApp::OnInit() ) + return false; + + MyFrame *frame = new MyFrame; - frame->Show(TRUE); - - return TRUE; + frame->Show(true); + + return true; } // ---------------------------------------------------------------------------- @@ -112,26 +151,43 @@ bool MyApp::OnInit() // ---------------------------------------------------------------------------- BEGIN_EVENT_TABLE(MyFrame, wxFrame) - EVT_MENU(Minimal_Quit, MyFrame::OnQuit) - EVT_MENU(Minimal_About, MyFrame::OnAbout) + EVT_MENU(Erase_Menu_UseBuffer, MyFrame::OnUseBuffer) + EVT_MENU(Erase_Menu_EraseBgInPaint, MyFrame::OnEraseBgInPaint) + EVT_MENU_RANGE(Erase_Menu_BgStyleErase, Erase_Menu_BgStylePaint, + MyFrame::OnChangeBgStyle) + + EVT_MENU(Erase_Menu_Exit, MyFrame::OnQuit) + EVT_MENU(Erase_Menu_About, MyFrame::OnAbout) + + EVT_UPDATE_UI(Erase_Menu_UseBuffer, MyFrame::OnUpdateUIUseBuffer) + EVT_UPDATE_UI_RANGE(Erase_Menu_BgStyleErase, Erase_Menu_BgStylePaint, + MyFrame::OnUpdateUIChangeBgStyle) END_EVENT_TABLE() // frame constructor -MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size) - : wxFrame((wxFrame *)NULL, -1, title, pos, size) +MyFrame::MyFrame() + : wxFrame(NULL, wxID_ANY, "Erase sample", + wxPoint(50, 50), wxSize(450, 340)) { -#ifdef __WXMAC__ - wxApp::s_macAboutMenuItemId = Minimal_About; -#endif - SetIcon(wxICON(mondrian)); wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF); + menuFile->AppendCheckItem(Erase_Menu_UseBuffer, "&Use memory DC\tCtrl-M"); + menuFile->AppendCheckItem(Erase_Menu_EraseBgInPaint, + "&Erase background in EVT_PAINT\tCtrl-R"); + menuFile->AppendSeparator(); + menuFile->AppendRadioItem(Erase_Menu_BgStyleErase, + "Use wxBG_STYLE_&ERASE\tCtrl-E"); + menuFile->AppendRadioItem(Erase_Menu_BgStyleSystem, + "Use wxBG_STYLE_&SYSTEM\tCtrl-S"); + menuFile->AppendRadioItem(Erase_Menu_BgStylePaint, + "Use wxBG_STYLE_&PAINT\tCtrl-P"); + menuFile->AppendSeparator(); + menuFile->Append(Erase_Menu_Exit, "E&xit\tAlt-X", "Quit this program"); - wxMenu *helpMenu = new wxMenu; - helpMenu->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog"); - menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program"); + wxMenu *helpMenu = new wxMenu; + helpMenu->Append(Erase_Menu_About, "&About...\tCtrl-A", "Show about dialog"); wxMenuBar *menuBar = new wxMenuBar(); menuBar->Append(menuFile, "&File"); @@ -139,59 +195,174 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size) SetMenuBar(menuBar); -#if wxUSE_STATUSBAR - // create a status bar just for fun (by default with 1 pane only) - CreateStatusBar(2); - SetStatusText("Welcome to wxWindows!"); -#endif // wxUSE_STATUSBAR + m_canvas = new MyCanvas( this ); +} + - (void)new MyCanvas( this ); +void MyFrame::OnUseBuffer(wxCommandEvent& event) +{ + m_canvas->UseBuffer(event.IsChecked()); } +void MyFrame::OnEraseBgInPaint(wxCommandEvent& event) +{ + m_canvas->EraseBgInPaint(event.IsChecked()); +} + +void MyFrame::OnChangeBgStyle(wxCommandEvent& event) +{ + int style = wxBG_STYLE_ERASE + event.GetId() - Erase_Menu_BgStyleErase; + m_canvas->SetBackgroundStyle(static_cast(style)); + + m_canvas->Refresh(); +} void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event)) { - Close(TRUE); + Close(true); } void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event)) { - wxString msg; - msg.Printf( _T("This is the about dialog of the Erase sample.\n") - _T("Welcome to %s"), wxVERSION_STRING); - - wxMessageBox(msg, "About Erase", wxOK | wxICON_INFORMATION, this); + wxMessageBox + ( + "This sample shows differences between different background styles " + "and how you may draw custom background.\n" + "\n" + "(c) 1998 Robert Roebling\n" + "(c) 2009 Vadim Zeitlin\n", + "About Erase Sample", + wxOK | wxICON_INFORMATION, + this + ); } BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow) - EVT_PAINT( MyCanvas::OnPaint) - EVT_ERASE_BACKGROUND( MyCanvas::OnEraseBackground) + EVT_PAINT(MyCanvas::OnPaint) + EVT_CHAR(MyCanvas::OnChar) + EVT_ERASE_BACKGROUND(MyCanvas::OnEraseBackground) END_EVENT_TABLE() -MyCanvas::MyCanvas( MyFrame *parent ) - : wxScrolledWindow( parent, -1, wxDefaultPosition, wxDefaultSize, - wxScrolledWindowStyle|wxNO_FULL_REPAINT_ON_RESIZE ) +MyCanvas::MyCanvas(wxFrame *parent) + : wxScrolledWindow(parent, wxID_ANY) { + m_useBuffer = false; + m_eraseBgInPaint = false; + SetScrollbars( 10, 10, 40, 100, 0, 0 ); + + m_bitmap = wxBitmap( wxICON(mondrian) ); + + new wxStaticBitmap( this, wxID_ANY, m_bitmap, wxPoint(80,20) ); + + SetFocusIgnoringChildren(); + SetBackgroundColour(*wxBLUE); } -void MyCanvas::OnPaint( wxPaintEvent &event ) +void MyCanvas::OnChar( wxKeyEvent &event ) { - wxPaintDC dc(this); - PrepareDC( dc ); - - wxRegion region( 110, 110, 80, 80 ); - wxRegion hole( 130, 130, 40, 1 ); - region.Intersect( hole ); - dc.SetClippingRegion( region ); - - dc.SetBrush( *wxRED_BRUSH ); - dc.DrawRectangle( 100, 100, 200, 200 ); +#if wxUSE_UNICODE + if (event.m_uniChar) + { + m_text += event.m_uniChar; + Refresh(); + return; + } +#endif + + // some test cases + switch (event.m_keyCode) + { + case WXK_UP: m_text += wxT( "" ); break; + case WXK_LEFT: m_text += wxT( "" ); break; + case WXK_RIGHT: m_text += wxT( "" ); break; + case WXK_DOWN: m_text += wxT( "" ); break; + case WXK_RETURN: m_text += wxT( "" ); break; + default: m_text += (wxChar)event.m_keyCode; break; + } +} + +void MyCanvas::DoPaint(wxDC& dc) +{ + if ( m_eraseBgInPaint ) + { + dc.SetBackground(*wxLIGHT_GREY); + dc.Clear(); + + dc.DrawText("Background erased in OnPaint", 65, 110); + } + else if ( GetBackgroundStyle() == wxBG_STYLE_PAINT ) + { + dc.SetTextForeground(*wxRED); + dc.DrawText("You must enable erasing background in OnPaint to avoid " + "display corruption", 65, 110); + } + + dc.SetBrush( *wxBLACK_BRUSH ); + dc.DrawRectangle( 10,10,60,50 ); + + dc.DrawBitmap( m_bitmap, 20, 20, true ); + + dc.SetTextForeground(*wxWHITE); + dc.DrawText("This text is drawn from OnPaint", 65, 65); + + wxString tmp; + tmp.Printf("Hit any key to display more text: %s", m_text); + + int w,h; + dc.GetTextExtent( tmp, &w, &h ); + dc.DrawRectangle( 65, 85, w, h ); + dc.DrawText( tmp, 65, 85 ); +} + +void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) ) +{ + if ( m_useBuffer ) + { + wxAutoBufferedPaintDC dc(this); + PrepareDC(dc); + + DoPaint(dc); + } + else + { + wxPaintDC dc(this); + PrepareDC(dc); + + DoPaint(dc); + } } -void MyCanvas::OnEraseBackground( wxEraseEvent &event ) +void MyCanvas::OnEraseBackground( wxEraseEvent& event ) { - event.Skip( TRUE ); + wxASSERT_MSG + ( + GetBackgroundStyle() == wxBG_STYLE_ERASE, + "shouldn't be called unless background style is \"erase\"" + ); + + wxDC& dc = *event.GetDC(); + dc.SetPen(*wxGREEN_PEN); + + PrepareDC( dc ); + + // clear any junk currently displayed + dc.Clear(); + + 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 += 15 ) + { + dc.DrawLine(0, y, size.x, y); + } + + dc.SetTextForeground(*wxRED); + dc.SetBackgroundMode(wxSOLID); + dc.DrawText("This text is drawn from OnEraseBackground", 60, 160); }