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Allow wxBufferedDC to be constructed with just a wxDC.

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32661 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robin Dunn
2005-03-08 00:38:53 +00:00
parent fe6cf12844
commit 116627da19
1 changed files with 12 additions and 3 deletions
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15
include/wx/dcbuffer.h
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@@ -37,7 +37,9 @@ public:
}
// Construct a wxBufferedDC using a user supplied buffer.
wxBufferedDC(wxDC *dc, const wxBitmap &buffer, int style = wxBUFFER_CLIENT_AREA)
wxBufferedDC(wxDC *dc,
const wxBitmap &buffer = wxNullBitmap,
int style = wxBUFFER_CLIENT_AREA)
: m_dc( dc ),
m_buffer( buffer ),
m_style(style)
@@ -67,7 +69,9 @@ public:
// 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.
void Init(wxDC *dc, const wxBitmap &buffer, int style = wxBUFFER_CLIENT_AREA)
void Init(wxDC *dc,
const wxBitmap &buffer=wxNullBitmap,
int style = wxBUFFER_CLIENT_AREA)
{
wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap,
_T("wxBufferedDC already initialised") );
@@ -112,7 +116,12 @@ private:
// check that the bitmap is valid and use it
void UseBuffer()
{
wxASSERT_MSG( m_buffer.Ok(), _T("invalid bitmap in wxBufferedDC") );
if (!m_buffer.Ok())
{
wxCoord w, h;
m_dc->GetSize(&w, &h);
m_buffer = wxBitmap(w, h);
}
SelectObject(m_buffer);
}