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