// ----------------------------------------------------------------------------
// 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
// ----------------------------------------------------------------------------
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;
+
DECLARE_EVENT_TABLE()
};
private:
void OnUseBuffer(wxCommandEvent& event);
+ void OnUseBgBitmap(wxCommandEvent& event);
+ void OnEraseBgInPaint(wxCommandEvent& event);
void OnChangeBgStyle(wxCommandEvent& event);
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
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
{
// menu items
Erase_Menu_UseBuffer = 100,
+ Erase_Menu_UseBgBitmap,
+ Erase_Menu_EraseBgInPaint,
Erase_Menu_BgStyleErase,
Erase_Menu_BgStyleSystem,
Erase_Menu_BgStylePaint,
// ----------------------------------------------------------------------------
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
- EVT_MENU(Erase_Menu_UseBuffer, MyFrame::OnUseBuffer)
+ 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)
: wxFrame(NULL, wxID_ANY, "Erase sample",
wxPoint(50, 50), wxSize(450, 340))
{
- SetIcon(wxICON(mondrian));
+ 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->AppendRadioItem(Erase_Menu_BgStyleErase,
"Use wxBG_STYLE_&ERASE\tCtrl-E");
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());
+}
+
void MyFrame::OnChangeBgStyle(wxCommandEvent& event)
{
int style = wxBG_STYLE_ERASE + event.GetId() - Erase_Menu_BgStyleErase;
BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
EVT_PAINT(MyCanvas::OnPaint)
- EVT_CHAR(MyCanvas::OnChar)
EVT_ERASE_BACKGROUND(MyCanvas::OnEraseBackground)
END_EVENT_TABLE()
: wxScrolledWindow(parent, wxID_ANY)
{
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) );
+ new wxStaticText(this, wxID_ANY,
+ "Left bitmap is a wxStaticBitmap,\n"
+ "right one drawn directly",
+ wxPoint(150, 20));
+
+ new ControlWithTransparency(this, wxPoint(65, 125), wxSize(300, 22));
+
SetFocusIgnoringChildren();
- SetBackgroundColour(*wxBLUE);
+ SetBackgroundColour(*wxCYAN);
}
-void MyCanvas::OnChar( wxKeyEvent &event )
+void MyCanvas::DoPaint(wxDC& dc)
{
-#if wxUSE_UNICODE
- if (event.m_uniChar)
+ if ( m_eraseBgInPaint )
{
- m_text += event.m_uniChar;
- Refresh();
- return;
- }
-#endif
+ dc.SetBackground(*wxLIGHT_GREY);
+ dc.Clear();
- // some test cases
- switch (event.m_keyCode)
+ dc.DrawText("Background erased in OnPaint", 65, 110);
+ }
+ else if ( GetBackgroundStyle() == wxBG_STYLE_PAINT )
{
- case WXK_UP: m_text += wxT( "<UP>" ); break;
- case WXK_LEFT: m_text += wxT( "<LEFT>" ); break;
- case WXK_RIGHT: m_text += wxT( "<RIGHT>" ); break;
- case WXK_DOWN: m_text += wxT( "<DOWN>" ); break;
- case WXK_RETURN: m_text += wxT( "<ENTER>" ); break;
- default: m_text += (wxChar)event.m_keyCode; break;
+ dc.SetTextForeground(*wxRED);
+ dc.DrawText("You must enable erasing background in OnPaint to avoid "
+ "display corruption", 65, 110);
}
-}
-
-void MyCanvas::DoPaint(wxDC& dc)
-{
- 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) )
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,
projects / wxWidgets.git / blobdiff