src/dfb/overlay.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/dfb/overlay.cpp
   3 // Purpose:     wxOverlay implementation for wxDFB
   4 // Author:      Vaclav Slavik
   5 // Created:     2006-10-20
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) wxWidgets team
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 // For compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #include "wx/private/overlay.h"
  27 #include "wx/dfb/private.h"
  28
  29 // ============================================================================
  30 // implementation
  31 // ============================================================================
  32
  33 // ----------------------------------------------------------------------------
  34 // wxOverlay
  35 // ----------------------------------------------------------------------------
  36
  37 wxOverlayImpl::wxOverlayImpl()
  38 {
  39     m_window = NULL;
  40     m_isEmpty = true;
  41 }
  42
  43 wxOverlayImpl::~wxOverlayImpl()
  44 {
  45     Reset();
  46 }
  47
  48 bool wxOverlayImpl::IsOk()
  49 {
  50     return m_window != NULL;
  51 }
  52
  53 void wxOverlayImpl::Init(wxWindowDC *dc, int x, int y, int width, int height)
  54 {
  55     wxASSERT_MSG( !IsOk() , _("You cannot Init an overlay twice") );
  56
  57     m_window = dc->GetWindow();
  58
  59     m_rect = wxRect(x, y, width, height);
  60     m_rect.Offset(m_window->GetClientAreaOrigin());
  61
  62     // FIXME: create surface with transparency or key color (?)
  63     m_surface =
  64         dc->GetDirectFBSurface()->CreateCompatible
  65                    (
  66                        m_rect.GetSize(),
  67                        wxIDirectFBSurface::CreateCompatible_NoBackBuffer
  68                    );
  69
  70     m_window->AddOverlay(this);
  71 }
  72
  73 void wxOverlayImpl::BeginDrawing(wxWindowDC *dc)
  74 {
  75     wxPoint origin(m_rect.GetPosition() - m_window->GetClientAreaOrigin());
  76
  77     // drawing on overlay "hijacks" existing wxWindowDC rather then using
  78     // another DC, so we have to change the DC to draw on the overlay's surface.
  79     // Setting m_shouldFlip is done to avoid flipping and drawing of overlays
  80     // in ~wxWindowDC (we do it EndDrawing).
  81     dc->Init(m_surface);
  82     dc->SetDeviceOrigin(-origin.x, -origin.y);
  83     dc->m_shouldFlip = false;
  84
  85     m_isEmpty = false;
  86 }
  87
  88 void wxOverlayImpl::EndDrawing(wxWindowDC *dc)
  89 {
  90     m_window->RefreshWindowRect(m_rect);
  91 }
  92
  93 void wxOverlayImpl::Clear(wxWindowDC *dc)
  94 {
  95     wxASSERT_MSG( IsOk(),
  96                   _T("You cannot Clear an overlay that is not initialized") );
  97
  98     m_isEmpty = true;
  99 }
 100
 101 void wxOverlayImpl::Reset()
 102 {
 103     if ( m_window )
 104     {
 105         m_window->RemoveOverlay(this);
 106         m_window = NULL;
 107         m_surface.Reset();
 108     }
 109 }