// Split platforms into two groups - those which have well-working
// double-buffering by default, and those which do not.
-#if defined(__WXMAC__) || defined(__WXGTK20__)
+#if defined(__WXMAC__) || defined(__WXGTK20__) || defined(__WXDFB__)
#define wxALWAYS_NATIVE_DOUBLE_BUFFER 1
#else
#define wxALWAYS_NATIVE_DOUBLE_BUFFER 0
// does not prepare the window DC
#define wxBUFFER_CLIENT_AREA 0x02
-class wxBufferedDC : public wxMemoryDC
+class WXDLLEXPORT wxBufferedDC : public wxMemoryDC
{
public:
// Default ctor, must subsequently call Init for two stage construction.
- wxBufferedDC() : m_dc( 0 ), m_style(0)
+ wxBufferedDC()
+ : m_dc(NULL),
+ m_style(0)
{
}
// Construct a wxBufferedDC using a user supplied buffer.
wxBufferedDC(wxDC *dc,
- const wxBitmap &buffer = wxNullBitmap,
+ const wxBitmap& buffer = wxNullBitmap,
int style = wxBUFFER_CLIENT_AREA)
- : m_dc( dc ),
- m_buffer( buffer ),
- m_style(style)
+ : m_dc(NULL)
{
- UseBuffer();
+ Init(dc, buffer, style);
}
// Construct a wxBufferedDC with an internal buffer of 'area'
// (where area is usually something like the size of the window
// being buffered)
- wxBufferedDC(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA)
- : m_dc( dc ),
- m_buffer( area.GetWidth(), area.GetHeight() ),
- m_style(style)
-
+ wxBufferedDC(wxDC *dc, const wxSize& area, int style = wxBUFFER_CLIENT_AREA)
+ : m_dc(NULL)
{
- UseBuffer();
+ Init(dc, area, style);
}
- // default copy ctor ok.
-
// The usually desired action in the dtor is to blit the buffer.
virtual ~wxBufferedDC()
{
- if ( m_dc ) UnMask();
+ if ( m_dc )
+ UnMask();
}
- // These reimplement the actions of the ctors for two stage creation, but
- // are not used by the ctors themselves to save a few cpu cycles.
+ // These reimplement the actions of the ctors for two stage creation
void Init(wxDC *dc,
- const wxBitmap &buffer=wxNullBitmap,
+ const wxBitmap& buffer = wxNullBitmap,
int style = wxBUFFER_CLIENT_AREA)
{
- wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap,
- _T("wxBufferedDC already initialised") );
- m_dc = dc;
+ InitCommon(dc, style);
+
m_buffer = buffer;
- m_style = style;
+
UseBuffer();
}
void Init(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA)
{
- Init(dc, wxBitmap(area.GetWidth(), area.GetHeight()), style);
+ InitCommon(dc, style);
+
+ UseBuffer(area.x, area.y);
}
// Blits the buffer to the dc, and detaches the dc from the buffer (so it
// blitting to) is destroyed.
void UnMask()
{
- wxASSERT_MSG( m_dc != 0,
- _T("No underlying DC associated with wxBufferedDC (anymore)") );
+ wxCHECK_RET( m_dc, _T("no underlying wxDC?") );
+ wxASSERT_MSG( m_buffer.IsOk(), _T("invalid backing store") );
- wxCoord x=0, y=0;
+ wxCoord x = 0,
+ y = 0;
- if (m_style & wxBUFFER_CLIENT_AREA)
+ if ( m_style & wxBUFFER_CLIENT_AREA )
GetDeviceOrigin(&x, &y);
- m_dc->Blit( 0, 0,
- m_buffer.GetWidth(), m_buffer.GetHeight(), this,
- -x, -y );
+ m_dc->Blit(0, 0, m_buffer.GetWidth(), m_buffer.GetHeight(),
+ this, -x, -y );
m_dc = NULL;
}
int GetStyle() const { return m_style; }
private:
- // check that the bitmap is valid and use it
- void UseBuffer()
+ // common part of Init()s
+ void InitCommon(wxDC *dc, int style)
{
- if (!m_buffer.Ok())
- {
- wxCoord w, h;
- m_dc->GetSize(&w, &h);
- m_buffer = wxBitmap(w, h);
- }
-
- SelectObject(m_buffer);
+ wxASSERT_MSG( !m_dc, _T("wxBufferedDC already initialised") );
+
+ m_dc = dc;
+ m_style = style;
+
+ // inherit the same layout direction as the original DC
+ if (dc && dc->IsOk())
+ SetLayoutDirection(dc->GetLayoutDirection());
}
+ // check that the bitmap is valid and use it
+ void UseBuffer(wxCoord w = -1, wxCoord h = -1);
+
// the underlying DC to which we copy everything drawn on this one in
// UnMask()
//
// could probably be a reference.
wxDC *m_dc;
- // the buffer (selected in this DC)
+ // the buffer (selected in this DC), initially invalid
wxBitmap m_buffer;
// the buffering style
int m_style;
+ DECLARE_DYNAMIC_CLASS(wxBufferedDC)
DECLARE_NO_COPY_CLASS(wxBufferedDC)
};
// Creates a double buffered wxPaintDC, optionally allowing the
// user to specify their own buffer to use.
-class wxBufferedPaintDC : public wxBufferedDC
+class WXDLLEXPORT wxBufferedPaintDC : public wxBufferedDC
{
public:
// If no bitmap is supplied by the user, a temporary one will be created.
private:
wxPaintDC m_paintdc;
+ DECLARE_ABSTRACT_CLASS(wxBufferedPaintDC)
DECLARE_NO_COPY_CLASS(wxBufferedPaintDC)
};
{
// Help the user to get the double-buffering working properly.
wxASSERT_MSG( win->GetBackgroundStyle() == wxBG_STYLE_CUSTOM,
- wxT("In constructor, you need to call GetBackgroundStyle(wxBG_STYLE_CUSTOM), ")
+ wxT("In constructor, you need to call SetBackgroundStyle(wxBG_STYLE_CUSTOM), ")
wxT("and also, if needed, paint the background manually in the paint event handler."));
}
else
return new wxBufferedPaintDC(window);
}
-
#endif // _WX_DCBUFFER_H_
projects / wxWidgets.git / blobdiff