contrib/include/wx/fl/antiflickpl.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        antiflickpl.h
   3 // Purpose:     Double-buffering plugin class for reducing flicker
   4 // Author:      Aleksandras Gluchovas (@Lithuania)
   5 // Modified by:
   6 // Created:     23/10/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Aleksandras Gluchovas
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef __ANTIFLICKPL_G__
  13 #define __ANTIFLICKPL_G__
  14
  15 #ifdef __GNUG__
  16     #pragma interface "antiflickpl.h"
  17 #endif
  18
  19 #include "wx/fl/controlbar.h"
  20
  21 /*
  22 Implements double-buffering to reduce flicker.
  23 Bitmap and memory DC buffers are shared "resources" among all instances of
  24 antiflicker plugins within the application.
  25
  26 Locking for multithreaded applications is  not yet implemented.
  27 */
  28
  29 class cbAntiflickerPlugin : public cbPluginBase
  30 {
  31         DECLARE_DYNAMIC_CLASS( cbAntiflickerPlugin )
  32 protected:
  33
  34         static wxBitmap*   mpVertBuf;
  35         static wxBitmap*   mpHorizBuf;
  36         static wxMemoryDC* mpVertBufDc;
  37         static wxMemoryDC* mpHorizBufDc;
  38
  39         static int mRefCount;
  40
  41         wxDC*  mpLRUBufDc; // last-recently-used buffer
  42         wxRect mLRUArea;   // last-recently-used area
  43
  44 protected:
  45         // Finds a suitable buffer. Returns NULL if a suitable buffer is not present.
  46         wxDC* FindSuitableBuffer( const wxRect& forArea );
  47         // Allocates a suitable buffer.
  48         wxDC* AllocNewBuffer( const wxRect& forArea );
  49
  50         wxDC& GetWindowDC();
  51         wxDC& GetClientDC();
  52 public:
  53
  54         cbAntiflickerPlugin(void);
  55
  56         cbAntiflickerPlugin( wxFrameLayout* pPanel, int paneMask = wxALL_PANES );
  57
  58         virtual ~cbAntiflickerPlugin();
  59
  60         // Handler for plugin event.
  61         void OnStartDrawInArea ( cbStartDrawInAreaEvent& event );
  62
  63         // Handler for plugin event.
  64         void OnFinishDrawInArea( cbFinishDrawInAreaEvent& event );
  65
  66         DECLARE_EVENT_TABLE()
  67 };
  68
  69 #endif /* __ANTIFLICKPL_G__ */
  70