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 #ifndef WX_PRECOMP
  27     #include "wx/frame.h"       // Only for wxFRAME_SHAPED.
  28     #include "wx/region.h"
  29     #include "wx/msw/private.h"
  30 #endif // WX_PRECOMP
  31
  32 #include "wx/nonownedwnd.h"
  33
  34 // ============================================================================
  35 // wxNonOwnedWindow implementation
  36 // ============================================================================
  37
  38 #ifndef __WXWINCE__
  39
  40 bool wxNonOwnedWindow::SetShape(const wxRegion& region)
  41 {
  42     wxCHECK_MSG( HasFlag(wxFRAME_SHAPED), false,
  43                  wxT("Shaped windows must be created with the wxFRAME_SHAPED style."));
  44
  45     // The empty region signifies that the shape should be removed from the
  46     // window.
  47     if ( region.IsEmpty() )
  48     {
  49         if (::SetWindowRgn(GetHwnd(), NULL, TRUE) == 0)
  50         {
  51             wxLogLastError(wxT("SetWindowRgn"));
  52             return false;
  53         }
  54         return true;
  55     }
  56
  57     // Windows takes ownership of the region, so
  58     // we'll have to make a copy of the region to give to it.
  59     DWORD noBytes = ::GetRegionData(GetHrgnOf(region), 0, NULL);
  60     RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
  61     ::GetRegionData(GetHrgnOf(region), noBytes, rgnData);
  62     HRGN hrgn = ::ExtCreateRegion(NULL, noBytes, rgnData);
  63     delete[] (char*) rgnData;
  64
  65     // SetWindowRgn expects the region to be in coordinates
  66     // relative to the window, not the client area.  Figure
  67     // out the offset, if any.
  68     RECT rect;
  69     DWORD dwStyle =   ::GetWindowLong(GetHwnd(), GWL_STYLE);
  70     DWORD dwExStyle = ::GetWindowLong(GetHwnd(), GWL_EXSTYLE);
  71     ::GetClientRect(GetHwnd(), &rect);
  72     ::AdjustWindowRectEx(&rect, dwStyle, ::GetMenu(GetHwnd()) != NULL, dwExStyle);
  73     ::OffsetRgn(hrgn, -rect.left, -rect.top);
  74
  75     // Now call the shape API with the new region.
  76     if (::SetWindowRgn(GetHwnd(), hrgn, TRUE) == 0)
  77     {
  78         wxLogLastError(wxT("SetWindowRgn"));
  79         return false;
  80     }
  81     return true;
  82 }
  83
  84 #endif // !__WXWINCE__