include/wx/overlay.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/overlay.h
   3 // Purpose:     wxOverlay class
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:     2006-10-20
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWidgets team
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_OVERLAY_H_
  13 #define _WX_OVERLAY_H_
  14
  15 #include "wx/defs.h"
  16
  17 #if defined(wxMAC_USE_CORE_GRAPHICS) && wxMAC_USE_CORE_GRAPHICS
  18     #define wxHAS_NATIVE_OVERLAY 1
  19 #elif defined(__WXDFB__)
  20     #define wxHAS_NATIVE_OVERLAY 1
  21 #else
  22     // don't define wxHAS_NATIVE_OVERLAY
  23 #endif
  24
  25 // ----------------------------------------------------------------------------
  26 // creates an overlay over an existing window, allowing for manipulations like
  27 // rubberbanding etc. This API is not stable yet, not to be used outside wx
  28 // internal code
  29 // ----------------------------------------------------------------------------
  30
  31 class WXDLLEXPORT wxOverlayImpl;
  32 class WXDLLEXPORT wxWindowDC;
  33
  34 class WXDLLEXPORT wxOverlay
  35 {
  36 public:
  37     wxOverlay();
  38     ~wxOverlay();
  39
  40     // clears the overlay without restoring the former state
  41     // to be done eg when the window content has been changed and repainted
  42     void Reset();
  43
  44     // returns (port-specific) implementation of the overlay
  45     wxOverlayImpl *GetImpl() { return m_impl; }
  46
  47 private:
  48     friend class WXDLLEXPORT wxDCOverlay;
  49
  50     // returns true if it has been setup
  51     bool IsOk();
  52
  53     void Init(wxWindowDC* dc, int x , int y , int width , int height);
  54
  55     void BeginDrawing(wxWindowDC* dc);
  56
  57     void EndDrawing(wxWindowDC* dc);
  58
  59     void Clear(wxWindowDC* dc);
  60
  61     wxOverlayImpl* m_impl;
  62
  63     bool m_inDrawing;
  64
  65
  66     DECLARE_NO_COPY_CLASS(wxOverlay)
  67 };
  68
  69
  70 class WXDLLEXPORT wxDCOverlay
  71 {
  72 public:
  73     // connects this overlay to the corresponding drawing dc, if the overlay is
  74     // not initialized yet this call will do so
  75     wxDCOverlay(wxOverlay &overlay, wxWindowDC *dc, int x , int y , int width , int height);
  76
  77     // convenience wrapper that behaves the same using the entire area of the dc
  78     wxDCOverlay(wxOverlay &overlay, wxWindowDC *dc);
  79
  80     // removes the connection between the overlay and the dc
  81     virtual ~wxDCOverlay();
  82
  83     // clears the layer, restoring the state at the last init
  84     void Clear();
  85
  86 private:
  87     void Init(wxWindowDC *dc, int x , int y , int width , int height);
  88
  89     wxOverlay& m_overlay;
  90
  91     wxWindowDC* m_dc;
  92
  93
  94     DECLARE_NO_COPY_CLASS(wxDCOverlay)
  95 };
  96
  97 #endif // _WX_OVERLAY_H_