X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/6fec48b709255fe4197e425db9166b9ffca55233..c29c95fe24973b94fd724db767193171ca7c513d:/samples/erase/erase.cpp diff --git a/samples/erase/erase.cpp b/samples/erase/erase.cpp index 99de17e1ba..138b3fa2bc 100644 --- a/samples/erase/erase.cpp +++ b/samples/erase/erase.cpp @@ -60,22 +60,49 @@ public: void UseBuffer(bool useBuffer) { m_useBuffer = useBuffer; 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; + // use background bitmap? + bool m_useBgBmp; + // erase background in OnPaint()? bool m_eraseBgInPaint; @@ -90,6 +117,7 @@ public: private: void OnUseBuffer(wxCommandEvent& event); + void OnUseBgBitmap(wxCommandEvent& event); void OnEraseBgInPaint(wxCommandEvent& event); void OnChangeBgStyle(wxCommandEvent& event); void OnQuit(wxCommandEvent& event); @@ -111,6 +139,34 @@ private: 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 @@ -120,6 +176,7 @@ enum { // menu items Erase_Menu_UseBuffer = 100, + Erase_Menu_UseBgBitmap, Erase_Menu_EraseBgInPaint, Erase_Menu_BgStyleErase, Erase_Menu_BgStyleSystem, @@ -153,6 +210,7 @@ bool MyApp::OnInit() BEGIN_EVENT_TABLE(MyFrame, wxFrame) 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) @@ -174,6 +232,8 @@ MyFrame::MyFrame() 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(); @@ -205,6 +265,11 @@ void MyFrame::OnUseBuffer(wxCommandEvent& event) m_canvas->UseBuffer(event.IsChecked()); } +void MyFrame::OnUseBgBitmap(wxCommandEvent& event) +{ + m_canvas->UseBgBitmap(event.IsChecked()); +} + void MyFrame::OnEraseBgInPaint(wxCommandEvent& event) { m_canvas->EraseBgInPaint(event.IsChecked()); @@ -241,7 +306,6 @@ void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event)) BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow) EVT_PAINT(MyCanvas::OnPaint) - EVT_CHAR(MyCanvas::OnChar) EVT_ERASE_BACKGROUND(MyCanvas::OnEraseBackground) END_EVENT_TABLE() @@ -249,6 +313,7 @@ MyCanvas::MyCanvas(wxFrame *parent) : wxScrolledWindow(parent, wxID_ANY) { m_useBuffer = false; + m_useBgBmp = false; m_eraseBgInPaint = false; SetScrollbars( 10, 10, 40, 100, 0, 0 ); @@ -262,33 +327,12 @@ MyCanvas::MyCanvas(wxFrame *parent) "right one drawn directly", wxPoint(150, 20)); + new ControlWithTransparency(this, wxPoint(65, 125), wxSize(300, 22)); + SetFocusIgnoringChildren(); SetBackgroundColour(*wxCYAN); } -void MyCanvas::OnChar( wxKeyEvent &event ) -{ -#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 ) @@ -305,21 +349,10 @@ void MyCanvas::DoPaint(wxDC& dc) "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.SetTextForeground(*wxRED); 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) ) @@ -342,6 +375,14 @@ void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) ) void MyCanvas::OnEraseBackground( wxEraseEvent& event ) { + // 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,