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 #ifndef WX_PRECOMP
  27     #include "wx/window.h"
  28     #include "wx/dcclient.h"
  29 #endif
  30
  31 #include "wx/private/overlay.h"
  32 #include "wx/dfb/private.h"
  33
  34 // ============================================================================
  35 // implementation
  36 // ============================================================================
  37
  38 // ----------------------------------------------------------------------------
  39 // wxOverlay
  40 // ----------------------------------------------------------------------------
  41
  42 wxOverlayImpl::wxOverlayImpl()
  43 {
  44     m_window = NULL;
  45     m_isEmpty = true;
  46 }
  47
  48 wxOverlayImpl::~wxOverlayImpl()
  49 {
  50     Reset();
  51 }
  52
  53 bool wxOverlayImpl::IsOk()
  54 {
  55     return m_window != NULL;
  56 }
  57
  58 void wxOverlayImpl::Init(wxWindowDC *dc, int x, int y, int width, int height)
  59 {
  60     wxASSERT_MSG( !IsOk() , _("You cannot Init an overlay twice") );
  61
  62     m_window = dc->GetWindow();
  63
  64     m_rect = wxRect(x, y, width, height);
  65     if ( wxDynamicCast(dc, wxClientDC) )
  66         m_rect.Offset(m_window->GetClientAreaOrigin());
  67
  68     // FIXME: create surface with transparency or key color (?)
  69     m_surface =
  70         dc->GetDirectFBSurface()->CreateCompatible
  71                    (
  72                        m_rect.GetSize(),
  73                        wxIDirectFBSurface::CreateCompatible_NoBackBuffer
  74                    );
  75
  76     m_window->AddOverlay(this);
  77 }
  78
  79 void wxOverlayImpl::BeginDrawing(wxWindowDC *dc)
  80 {
  81     wxPoint origin(m_rect.GetPosition());
  82     if ( wxDynamicCast(dc, wxClientDC) )
  83         origin -= m_window->GetClientAreaOrigin();
  84
  85     // drawing on overlay "hijacks" existing wxWindowDC rather then using
  86     // another DC, so we have to change the DC to draw on the overlay's surface.
  87     // Setting m_shouldFlip is done to avoid flipping and drawing of overlays
  88     // in ~wxWindowDC (we do it EndDrawing).
  89     dc->DFBInit(m_surface);
  90     dc->SetDeviceOrigin(-origin.x, -origin.y);
  91     dc->m_shouldFlip = false;
  92
  93     m_isEmpty = false;
  94 }
  95
  96 void wxOverlayImpl::EndDrawing(wxWindowDC *dc)
  97 {
  98     m_window->RefreshWindowRect(m_rect);
  99 }
 100
 101 void wxOverlayImpl::Clear(wxWindowDC *dc)
 102 {
 103     wxASSERT_MSG( IsOk(),
 104                   "You cannot Clear an overlay that is not initialized" );
 105
 106     m_isEmpty = true;
 107 }
 108
 109 void wxOverlayImpl::Reset()
 110 {
 111     if ( m_window )
 112     {
 113         m_window->RemoveOverlay(this);
 114         m_window = NULL;
 115         m_surface.Reset();
 116     }
 117 }