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 licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef __ANTIFLICKPL_G__
  13 #define __ANTIFLICKPL_G__
  14
  15 #include "wx/fl/controlbar.h"
  16
  17 /*
  18 Implements double-buffering to reduce flicker.
  19 Bitmap and memory DC buffers are shared 'resources' among all instances of
  20 antiflicker plugins within the application.
  21
  22 Locking for multithreaded applications is not yet implemented.
  23 */
  24
  25 class WXDLLIMPEXP_FL cbAntiflickerPlugin : public cbPluginBase
  26 {
  27     DECLARE_DYNAMIC_CLASS( cbAntiflickerPlugin )
  28 protected:
  29
  30     static wxBitmap*   mpVertBuf;
  31     static wxBitmap*   mpHorizBuf;
  32     static wxMemoryDC* mpVertBufDc;
  33     static wxMemoryDC* mpHorizBufDc;
  34
  35     static int mRefCount;
  36
  37     wxDC*  mpLRUBufDc; // last-recently-used buffer
  38     wxRect mLRUArea;   // last-recently-used area
  39
  40 protected:
  41         // Finds a suitable buffer. Returns NULL if a suitable buffer is not present.
  42
  43     wxDC* FindSuitableBuffer( const wxRect& forArea );
  44
  45         // Allocates a suitable buffer.
  46
  47     wxDC* AllocNewBuffer( const wxRect& forArea );
  48
  49         // Gets the window device context.
  50
  51     wxDC& GetWindowDC();
  52
  53         // Gets the client device context.
  54
  55     wxDC& GetClientDC();
  56 public:
  57
  58         // Default constructor.
  59
  60     cbAntiflickerPlugin(void);
  61
  62         // Constructor taking frame layout panel, and pane mask.
  63
  64     cbAntiflickerPlugin( wxFrameLayout* pPanel, int paneMask = wxALL_PANES );
  65
  66         // Destructor.
  67
  68     virtual ~cbAntiflickerPlugin();
  69
  70         // Handler for plugin event.
  71
  72     void OnStartDrawInArea ( cbStartDrawInAreaEvent& event );
  73
  74         // Handler for plugin event.
  75
  76     void OnFinishDrawInArea( cbFinishDrawInAreaEvent& event );
  77
  78     DECLARE_EVENT_TABLE()
  79 };
  80
  81 #endif /* __ANTIFLICKPL_G__ */
  82