wxWidgets/contrib/include/wx/fl/antiflickpl.h

/////////////////////////////////////////////////////////////////////////////
// Name:        antiflickpl.h
// Purpose:     Double-buffering plugin class for reducing flicker
// Author:      Aleksandras Gluchovas (@Lithuania)
// Modified by:
// Created:     23/10/98
// RCS-ID:      $Id$
// Copyright:   (c) Aleksandras Gluchovas
// Licence:   	wxWindows license
/////////////////////////////////////////////////////////////////////////////

#ifndef __ANTIFLICKPL_G__
#define __ANTIFLICKPL_G__

#ifdef __GNUG__
    #pragma interface "antiflickpl.h"
#endif

#include "wx/fl/controlbar.h"

/*
Implements double-buffering to reduce flicker.
Bitmap and memory DC buffers are shared "resources" among all instances of
antiflicker plugins within the application.

Locking for multithreaded applications is  not yet implemented.
*/

class cbAntiflickerPlugin : public cbPluginBase
{
	DECLARE_DYNAMIC_CLASS( cbAntiflickerPlugin )
protected:

	static wxBitmap*   mpVertBuf;
	static wxBitmap*   mpHorizBuf;
	static wxMemoryDC* mpVertBufDc;
	static wxMemoryDC* mpHorizBufDc;

	static int mRefCount;

	wxDC*  mpLRUBufDc; // last-recently-used buffer
	wxRect mLRUArea;   // last-recently-used area

protected:
	// Finds a suitable buffer. Returns NULL if a suitable buffer is not present.
	wxDC* FindSuitableBuffer( const wxRect& forArea );
	// Allocates a suitable buffer.
	wxDC* AllocNewBuffer( const wxRect& forArea );

	wxDC& GetWindowDC();
	wxDC& GetClientDC();
public:

	cbAntiflickerPlugin(void);

	cbAntiflickerPlugin( wxFrameLayout* pPanel, int paneMask = wxALL_PANES );

	virtual ~cbAntiflickerPlugin();

	// Handler for plugin event.
	void OnStartDrawInArea ( cbStartDrawInAreaEvent& event );

	// Handler for plugin event.
	void OnFinishDrawInArea( cbFinishDrawInAreaEvent& event );

	DECLARE_EVENT_TABLE()
};

#endif /* __ANTIFLICKPL_G__ */