include/wx/dcbuffer.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/dcbuffer.h
   3 // Purpose:     wxBufferedDC class
   4 // Author:      Ron Lee <ron@debian.org>
   5 // Modified by:
   6 // Created:     16/03/02
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Ron Lee
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_DCBUFFER_H_
  13 #define _WX_DCBUFFER_H_
  14
  15 #if defined(__GNUG__) && !defined(__APPLE__)
  16 #pragma interface "dcbuffer.h"
  17 #endif
  18
  19 #include "wx/dcmemory.h"
  20 #include "wx/dcclient.h"
  21
  22
  23 // ==============================================================
  24 //   Double buffering helper.
  25 // --------------------------------------------------------------
  26
  27 class WXDLLEXPORT wxBufferedDC : public wxMemoryDC
  28 {
  29 private:
  30
  31         // Without the existence of a wxNullDC, this must be
  32         // a pointer, else it could probably be a reference.
  33
  34     wxDC        *m_dc;
  35     wxBitmap    m_buffer;
  36
  37 public:
  38
  39         // Default ctor, must subsequently call Init for
  40         // two stage construction.
  41
  42     wxBufferedDC()
  43         : m_dc( 0 )
  44     {}
  45
  46         // Construct a wxBufferedDC using a user supplied buffer.
  47
  48     wxBufferedDC( wxDC *dc, const wxBitmap &buffer );
  49
  50         // Construct a wxBufferedDC with an internal buffer of 'area'
  51         // (where area is usually something like the size of the window
  52         // being buffered)
  53
  54     wxBufferedDC( wxDC *dc, const wxSize &area );
  55
  56     // default copy ctor ok.
  57
  58         // The usually desired  action in the dtor is to blit the buffer.
  59
  60     ~wxBufferedDC();
  61
  62         // These reimplement the actions of the ctors for
  63         // two stage creation, but are not used by the ctors
  64         // themselves to save a few cpu cycles.
  65
  66     void Init( wxDC *dc, const wxBitmap &bitmap );
  67     void Init( wxDC *dc, const wxSize &area );
  68
  69         // Blits the buffer to the dc, and detaches the dc from
  70         // the buffer.  Usually called in the dtor or by the dtor
  71         // of derived classes if the BufferedDC must blit before
  72         // the derived class (which may own the dc it's blitting
  73         // to) is destroyed.
  74
  75     void UnMask();
  76
  77     DECLARE_NO_COPY_CLASS(wxBufferedDC)
  78 };
  79
  80
  81 // ==============================================================
  82 //   Double buffered PaintDC.
  83 // --------------------------------------------------------------
  84
  85 // Creates a double buffered wxPaintDC, optionally allowing the
  86 // user to specify their own buffer to use.
  87
  88 class WXDLLEXPORT wxBufferedPaintDC : public wxBufferedDC
  89 {
  90 private:
  91
  92     wxPaintDC    m_paintdc;
  93
  94 public:
  95
  96     wxBufferedPaintDC( wxWindow *window, const wxBitmap &buffer = wxNullBitmap );
  97
  98     // default copy ctor ok.
  99
 100     ~wxBufferedPaintDC();
 101 };
 102
 103
 104 #endif  // _WX_DCBUFFER_H_
 105