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added test for not erasing background

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31997 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2005-02-13 15:42:31 +00:00
parent 284f2b59db
commit b18eb01cd1
1 changed files with 21 additions and 0 deletions
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21
samples/erase/erase.cpp
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@ -60,6 +60,7 @@ public:
MyCanvas( wxFrame *parent );
void UseBuffer(bool useBuffer) { m_useBuffer = useBuffer; Refresh(); }
void EraseBg(bool eraseBg) { m_eraseBg = eraseBg; Refresh(); }
private:
void OnPaint( wxPaintEvent &event );
@ -75,6 +76,10 @@ private:
// use wxMemoryDC in OnPaint()?
bool m_useBuffer;
// paint custom background in OnEraseBackground()?
bool m_eraseBg;
DECLARE_EVENT_TABLE()
};
@ -84,6 +89,7 @@ public:
MyFrame();
void OnUseBuffer(wxCommandEvent& event);
void OnEraseBg(wxCommandEvent& event);
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
@ -102,6 +108,7 @@ enum
{
// menu items
Erase_Menu_UseBuffer = 100,
Erase_Menu_EraseBg,
Erase_Menu_Exit = wxID_EXIT,
Erase_Menu_About = wxID_ABOUT
};
@ -128,6 +135,7 @@ 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_Exit, MyFrame::OnQuit)
EVT_MENU(Erase_Menu_About, MyFrame::OnAbout)
END_EVENT_TABLE()
@ -141,6 +149,7 @@ MyFrame::MyFrame()
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"));
@ -169,6 +178,11 @@ 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))
{
Close(true);
@ -191,6 +205,7 @@ MyCanvas::MyCanvas( wxFrame *parent )
: wxScrolledWindow( parent, wxID_ANY, wxDefaultPosition, wxDefaultSize,
wxScrolledWindowStyle | wxSUNKEN_BORDER )
{
m_eraseBg =
m_useBuffer = false;
SetScrollbars( 10, 10, 40, 100, 0, 0 );
@ -316,6 +331,12 @@ void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
void MyCanvas::OnEraseBackground( wxEraseEvent& event )
{
if ( !m_eraseBg )
{
event.Skip();
return;
}
wxDC& dc = *event.GetDC();
dc.SetPen(*wxGREEN_PEN);