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     if ( wxDynamicCast(dc, wxClientDC) )
  61         m_rect.Offset(m_window->GetClientAreaOrigin());
  62
  63     // FIXME: create surface with transparency or key color (?)
  64     m_surface =
  65         dc->GetDirectFBSurface()->CreateCompatible
  66                    (
  67                        m_rect.GetSize(),
  68                        wxIDirectFBSurface::CreateCompatible_NoBackBuffer
  69                    );
  70
  71     m_window->AddOverlay(this);
  72 }
  73
  74 void wxOverlayImpl::BeginDrawing(wxWindowDC *dc)
  75 {
  76     wxPoint origin(m_rect.GetPosition());
  77     if ( wxDynamicCast(dc, wxClientDC) )
  78         origin -= m_window->GetClientAreaOrigin();
  79
  80     // drawing on overlay "hijacks" existing wxWindowDC rather then using
  81     // another DC, so we have to change the DC to draw on the overlay's surface.
  82     // Setting m_shouldFlip is done to avoid flipping and drawing of overlays
  83     // in ~wxWindowDC (we do it EndDrawing).
  84     dc->DFBInit(m_surface);
  85     dc->SetDeviceOrigin(-origin.x, -origin.y);
  86     dc->m_shouldFlip = false;
  87
  88     m_isEmpty = false;
  89 }
  90
  91 void wxOverlayImpl::EndDrawing(wxWindowDC *dc)
  92 {
  93     m_window->RefreshWindowRect(m_rect);
  94 }
  95
  96 void wxOverlayImpl::Clear(wxWindowDC *dc)
  97 {
  98     wxASSERT_MSG( IsOk(),
  99                   _T("You cannot Clear an overlay that is not initialized") );
 100
 101     m_isEmpty = true;
 102 }
 103
 104 void wxOverlayImpl::Reset()
 105 {
 106     if ( m_window )
 107     {
 108         m_window->RemoveOverlay(this);
 109         m_window = NULL;
 110         m_surface.Reset();
 111     }
 112 }