src/msw/nonownedwnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/nonownedwnd.cpp
   3 // Purpose:     wxNonOwnedWindow implementation for MSW.
   4 // Author:      Vadim Zeitlin
   5 // Created:     2011-10-09 (extracted from src/msw/toplevel.cpp)
   6 // RCS-ID:      $Id: $
   7 // Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
   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 // This class can't be implemented and hence is not used under Win CE.
  27 #ifndef __WXWINCE__
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/frame.h"       // Only for wxFRAME_SHAPED.
  31     #include "wx/region.h"
  32     #include "wx/msw/private.h"
  33 #endif // WX_PRECOMP
  34
  35 #include "wx/nonownedwnd.h"
  36
  37 // ============================================================================
  38 // wxNonOwnedWindow implementation
  39 // ============================================================================
  40
  41 bool wxNonOwnedWindow::SetShape(const wxRegion& region)
  42 {
  43     wxCHECK_MSG( HasFlag(wxFRAME_SHAPED), false,
  44                  wxT("Shaped windows must be created with the wxFRAME_SHAPED style."));
  45
  46     // The empty region signifies that the shape should be removed from the
  47     // window.
  48     if ( region.IsEmpty() )
  49     {
  50         if (::SetWindowRgn(GetHwnd(), NULL, TRUE) == 0)
  51         {
  52             wxLogLastError(wxT("SetWindowRgn"));
  53             return false;
  54         }
  55         return true;
  56     }
  57
  58     // Windows takes ownership of the region, so
  59     // we'll have to make a copy of the region to give to it.
  60     DWORD noBytes = ::GetRegionData(GetHrgnOf(region), 0, NULL);
  61     RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
  62     ::GetRegionData(GetHrgnOf(region), noBytes, rgnData);
  63     HRGN hrgn = ::ExtCreateRegion(NULL, noBytes, rgnData);
  64     delete[] (char*) rgnData;
  65
  66     // SetWindowRgn expects the region to be in coordinates
  67     // relative to the window, not the client area.
  68     const wxPoint clientOrigin = GetClientAreaOrigin();
  69     ::OffsetRgn(hrgn, -clientOrigin.x, -clientOrigin.y);
  70
  71     // Now call the shape API with the new region.
  72     if (::SetWindowRgn(GetHwnd(), hrgn, TRUE) == 0)
  73     {
  74         wxLogLastError(wxT("SetWindowRgn"));
  75         return false;
  76     }
  77     return true;
  78 }
  79
  80 #endif // !__WXWINCE__