#pragma hdrstop
#endif
-#ifndef WX_PRECOMP
-#endif
-
#include "wx/dcbuffer.h"
+#ifndef WX_PRECOMP
+ #include "wx/module.h"
+#endif
// ============================================================================
// implementation
// ============================================================================
-// ============================================================================
-// wxSharedDCBufferManager
-// Helper class to free shared buffer when the app exists.
-// ============================================================================
+// ----------------------------------------------------------------------------
+// wxSharedDCBufferManager: helper class maintaining backing store bitmap
+// ----------------------------------------------------------------------------
-class wxSharedDCBufferManager
+class wxSharedDCBufferManager : public wxModule
{
- friend class wxBufferedDC;
public:
-
wxSharedDCBufferManager() { }
- ~wxSharedDCBufferManager() { }
- wxBitmap* GetBuffer(int w, int h)
+ virtual bool OnInit() { return true; }
+ virtual void OnExit() { wxDELETE(ms_buffer); }
+
+ static wxBitmap* GetBuffer(int w, int h)
{
- if ( !m_buffer.IsOk() ||
- w > m_buffer.GetWidth() ||
- h > m_buffer.GetHeight() )
+ if ( !ms_buffer ||
+ w > ms_buffer->GetWidth() ||
+ h > ms_buffer->GetHeight() )
{
- // Create slightly larger bitmap so we don't need to
- // be reallocating constantly when the user enlarges
- // the frame for the first time.
- m_buffer = wxBitmap(w, h);
+ delete ms_buffer;
+ ms_buffer = new wxBitmap(w, h);
}
-
- return &m_buffer;
+ return ms_buffer;
}
private:
- wxBitmap m_buffer;
+ static wxBitmap *ms_buffer;
+
+ DECLARE_DYNAMIC_CLASS(wxSharedDCBufferManager)
};
-static wxSharedDCBufferManager gs_sharedDCBufferManager;
+wxBitmap* wxSharedDCBufferManager::ms_buffer = NULL;
+IMPLEMENT_DYNAMIC_CLASS(wxSharedDCBufferManager, wxModule)
// ============================================================================
// wxBufferedDC
void wxBufferedDC::UseBuffer(wxCoord w, wxCoord h)
{
- if ( !m_buffer )
+ if ( !m_buffer || !m_buffer->IsOk() )
{
if ( w == -1 || h == -1 )
m_dc->GetSize(&w, &h);
- m_buffer = gs_sharedDCBufferManager.GetBuffer(w, h);
+ m_buffer = wxSharedDCBufferManager::GetBuffer(w, h);
}
SelectObject(*m_buffer);