X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/32cb55b0bb073f1cc86b1db5c7ccf911108bfc5d..c29c95fe24973b94fd724db767193171ca7c513d:/samples/erase/erase.cpp?ds=sidebyside diff --git a/samples/erase/erase.cpp b/samples/erase/erase.cpp index 94dd570ec4..138b3fa2bc 100644 --- a/samples/erase/erase.cpp +++ b/samples/erase/erase.cpp @@ -1,11 +1,11 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: erase.cpp +// Name: samples/erase/erase.cpp // Purpose: Erase wxWidgets sample -// Author: Robert Roebling -// Modified by: +// 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 ///////////////////////////////////////////////////////////////////////////// @@ -30,12 +30,15 @@ #include "wx/wx.h" #endif +#include "wx/dcbuffer.h" + // ---------------------------------------------------------------------------- // resources // ---------------------------------------------------------------------------- + // the application icon -#if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__) || defined(__WXX11__) - #include "mondrian.xpm" +#if !defined(__WXMSW__) && !defined(__WXPM__) + #include "../sample.xpm" #endif // ---------------------------------------------------------------------------- @@ -52,27 +55,56 @@ public: class MyCanvas : public wxScrolledWindow { public: - MyCanvas( wxFrame *parent ); + MyCanvas(wxFrame *parent); void UseBuffer(bool useBuffer) { m_useBuffer = useBuffer; Refresh(); } - void EraseBg(bool eraseBg) { m_eraseBg = eraseBg; Refresh(); } + bool UsesBuffer() const { return m_useBuffer; } + + void UseBgBitmap(bool useBgBmp) + { + m_useBgBmp = useBgBmp; + SetBackgroundBitmap(m_useBgBmp ? GetBgBitmap() : wxBitmap()); + + Refresh(); + } + + 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); + // Create an easily recognizable background bitmap. + static wxBitmap GetBgBitmap() + { + static const int BMP_SIZE = 40; + + wxBitmap bmp(BMP_SIZE, BMP_SIZE); + wxMemoryDC dc(bmp); + dc.SetBackground(*wxCYAN); + dc.Clear(); + + dc.SetPen(*wxBLUE_PEN); + dc.DrawLine(0, BMP_SIZE/2, BMP_SIZE/2, 0); + dc.DrawLine(BMP_SIZE/2, 0, BMP_SIZE, BMP_SIZE/2); + dc.DrawLine(BMP_SIZE, BMP_SIZE/2, BMP_SIZE/2, BMP_SIZE); + dc.DrawLine(BMP_SIZE/2, BMP_SIZE, 0, BMP_SIZE/2); + + return bmp; + } wxBitmap m_bitmap; - wxString m_text; // use wxMemoryDC in OnPaint()? bool m_useBuffer; - // paint custom background in OnEraseBackground()? - bool m_eraseBg; + // use background bitmap? + bool m_useBgBmp; + + // erase background in OnPaint()? + bool m_eraseBgInPaint; DECLARE_EVENT_TABLE() @@ -83,17 +115,58 @@ class MyFrame : public wxFrame public: MyFrame(); +private: void OnUseBuffer(wxCommandEvent& event); - void OnEraseBg(wxCommandEvent& event); + void OnUseBgBitmap(wxCommandEvent& event); + void OnEraseBgInPaint(wxCommandEvent& event); + void OnChangeBgStyle(wxCommandEvent& event); void OnQuit(wxCommandEvent& event); void OnAbout(wxCommandEvent& event); -private: + // 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() }; +class ControlWithTransparency : public wxWindow +{ +public: + ControlWithTransparency(wxWindow *parent, + const wxPoint& pos, + const wxSize& size) + : wxWindow(parent, wxID_ANY, pos, size, wxBORDER_NONE) + { + Connect(wxEVT_PAINT, + wxPaintEventHandler(ControlWithTransparency::OnPaint)); + } + + virtual bool HasTransparentBackground() { return true; } + +private: + void OnPaint( wxPaintEvent& WXUNUSED(event) ) + { + wxPaintDC dc(this); + + dc.SetPen(*wxRED_PEN); + dc.SetBrush(*wxTRANSPARENT_BRUSH); + dc.DrawRectangle(GetClientSize()); + + dc.SetTextForeground(*wxBLUE); + dc.SetBackgroundMode(wxTRANSPARENT); + dc.DrawText("This is custom control with transparency", 0, 2); + } +}; // ---------------------------------------------------------------------------- // constants @@ -103,7 +176,11 @@ enum { // menu items Erase_Menu_UseBuffer = 100, - Erase_Menu_EraseBg, + Erase_Menu_UseBgBitmap, + Erase_Menu_EraseBgInPaint, + Erase_Menu_BgStyleErase, + Erase_Menu_BgStyleSystem, + Erase_Menu_BgStylePaint, Erase_Menu_Exit = wxID_EXIT, Erase_Menu_About = wxID_ABOUT }; @@ -132,41 +209,53 @@ bool MyApp::OnInit() // ---------------------------------------------------------------------------- BEGIN_EVENT_TABLE(MyFrame, wxFrame) - EVT_MENU(Erase_Menu_UseBuffer, MyFrame::OnUseBuffer) - EVT_MENU(Erase_Menu_EraseBg, MyFrame::OnEraseBg) + EVT_MENU(Erase_Menu_UseBuffer, MyFrame::OnUseBuffer) + EVT_MENU(Erase_Menu_UseBgBitmap, MyFrame::OnUseBgBitmap) + 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() - : wxFrame(NULL, wxID_ANY, _T("Erase sample"), + : wxFrame(NULL, wxID_ANY, "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")); + SetIcon(wxICON(sample)); + + wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF); + menuFile->AppendCheckItem(Erase_Menu_UseBuffer, "&Use memory DC\tCtrl-M"); + menuFile->AppendCheckItem(Erase_Menu_UseBgBitmap, + "Use background &bitmap\tCtrl-B"); + menuFile->AppendCheckItem(Erase_Menu_EraseBgInPaint, + "&Erase background in EVT_PAINT\tCtrl-R"); menuFile->AppendSeparator(); - menuFile->Append(Erase_Menu_Exit, _T("E&xit\tAlt-X"), _T("Quit this program")); + 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(Erase_Menu_About, _T("&About...\tCtrl-A"), _T("Show about dialog")); + helpMenu->Append(Erase_Menu_About, "&About...\tCtrl-A", "Show about dialog"); wxMenuBar *menuBar = new wxMenuBar(); - menuBar->Append(menuFile, _T("&File")); - menuBar->Append(helpMenu, _T("&Help")); + menuBar->Append(menuFile, "&File"); + menuBar->Append(helpMenu, "&Help"); SetMenuBar(menuBar); -#if wxUSE_STATUSBAR - // create a status bar just for fun (by default with 1 pane only) - CreateStatusBar(2); - SetStatusText(_T("Welcome to wxWidgets erase sample!")); -#endif // wxUSE_STATUSBAR - m_canvas = new MyCanvas( this ); } @@ -176,9 +265,22 @@ void MyFrame::OnUseBuffer(wxCommandEvent& event) m_canvas->UseBuffer(event.IsChecked()); } -void MyFrame::OnEraseBg(wxCommandEvent& event) +void MyFrame::OnUseBgBitmap(wxCommandEvent& event) { - m_canvas->EraseBg(event.IsChecked()); + m_canvas->UseBgBitmap(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)) @@ -188,153 +290,105 @@ void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event)) void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event)) { - wxMessageBox(_T("This sample shows how you can draw custom background."), - _T("About Erase Sample"), 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_CHAR( MyCanvas::OnChar) - EVT_ERASE_BACKGROUND( MyCanvas::OnEraseBackground) + EVT_PAINT(MyCanvas::OnPaint) + EVT_ERASE_BACKGROUND(MyCanvas::OnEraseBackground) END_EVENT_TABLE() -MyCanvas::MyCanvas( wxFrame *parent ) - : wxScrolledWindow( parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, - wxScrolledWindowStyle | wxSUNKEN_BORDER ) +MyCanvas::MyCanvas(wxFrame *parent) + : wxScrolledWindow(parent, wxID_ANY) { - m_eraseBg = m_useBuffer = false; + m_useBgBmp = false; + m_eraseBgInPaint = false; SetScrollbars( 10, 10, 40, 100, 0, 0 ); - m_bitmap = wxBitmap( wxICON(mondrian) ); + m_bitmap = wxBitmap( wxICON(sample) ); new wxStaticBitmap( this, wxID_ANY, m_bitmap, wxPoint(80,20) ); - SetFocusIgnoringChildren(); -} + new wxStaticText(this, wxID_ANY, + "Left bitmap is a wxStaticBitmap,\n" + "right one drawn directly", + wxPoint(150, 20)); -void MyCanvas::OnChar( wxKeyEvent &event ) -{ -#if wxUSE_UNICODE - if (event.m_uniChar) - { - m_text += event.m_uniChar; - Refresh(); - return; - } -#endif + new ControlWithTransparency(this, wxPoint(65, 125), wxSize(300, 22)); - // 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; - } + SetFocusIgnoringChildren(); + SetBackgroundColour(*wxCYAN); } void MyCanvas::DoPaint(wxDC& dc) { - dc.SetBrush( *wxBLACK_BRUSH ); - 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; - dc.GetTextExtent( tmp, &w, &h ); - dc.SetBrush( *wxWHITE_BRUSH ); - dc.DrawRectangle( 65, 85, w, h ); - dc.DrawText( tmp, 65, 85 ); + if ( m_eraseBgInPaint ) + { + dc.SetBackground(*wxLIGHT_GREY); + dc.Clear(); -#if 0 - wxRegionIterator upd( GetUpdateRegion() ); - while (upd) + dc.DrawText("Background erased in OnPaint", 65, 110); + } + else if ( GetBackgroundStyle() == wxBG_STYLE_PAINT ) { - wxLogDebug( _T("Paint: %d %d %d %d"), upd.GetX(), upd.GetY(), upd.GetWidth(), upd.GetHeight() ); - upd ++; + dc.SetTextForeground(*wxRED); + dc.DrawText("You must enable erasing background in OnPaint to avoid " + "display corruption", 65, 110); } -#endif - -#if 0 - wxSize size = GetSize(); - wxSize client_size = GetClientSize(); - wxLogDebug( _T("size %d %d client_size %d %d"), size.x, size.y, client_size.x, client_size.y ); -#endif - -#if 0 - int i; - dc.SetPen( *wxWHITE_PEN ); - for (i = 0; i < 20; i += 2) - dc.DrawLine( i,i, i+100,i ); - - dc.SetPen( *wxWHITE_PEN ); - for (i = 200; i < 220; i += 2) - dc.DrawLine( i-200,i, i-100,i ); - - 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 ); - dc.DestroyClippingRegion(); + dc.DrawBitmap( m_bitmap, 20, 20, true ); - dc.SetPen( *wxTRANSPARENT_PEN ); - - wxRegion strip( 110, 200, 30, 1 ); - wxRegionIterator it( strip ); - while (it) - { - dc.DrawRectangle( it.GetX(), it.GetY(), it.GetWidth(), it.GetHeight() ); - it ++; - } -#endif // 0 + dc.SetTextForeground(*wxRED); + dc.DrawText("This text is drawn from OnPaint", 65, 65); } 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 ); + wxAutoBufferedPaintDC dc(this); + PrepareDC(dc); DoPaint(dc); - - dcWin.Blit(0, 0, size.x, size.y, &dc, 0, 0); } else { - DoPaint(dcWin); + wxPaintDC dc(this); + PrepareDC(dc); + + DoPaint(dc); } } void MyCanvas::OnEraseBackground( wxEraseEvent& event ) { - if ( !m_eraseBg ) + // We must not erase the background ourselves if we asked wxPanel to erase + // it using a background bitmap. + if ( m_useBgBmp ) { event.Skip(); return; } + wxASSERT_MSG + ( + GetBackgroundStyle() == wxBG_STYLE_ERASE, + "shouldn't be called unless background style is \"erase\"" + ); + wxDC& dc = *event.GetDC(); dc.SetPen(*wxGREEN_PEN); @@ -355,6 +409,7 @@ void MyCanvas::OnEraseBackground( wxEraseEvent& event ) } dc.SetTextForeground(*wxRED); - dc.DrawText(_T("This text is drawn from OnEraseBackground"), 60, 160); + dc.SetBackgroundMode(wxSOLID); + dc.DrawText("This text is drawn from OnEraseBackground", 60, 160); }