src/msw/nativewin.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/nativewin.cpp
   3 // Purpose:     wxNativeWindow implementation
   4 // Author:      Vadim Zeitlin
   5 // Created:     2008-03-05
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2008 Vadim Zeitlin <vadim@wxwindows.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/nativewin.h"
  30 #include "wx/msw/private.h"
  31
  32 // ============================================================================
  33 // implementation
  34 // ============================================================================
  35
  36 bool wxNativeContainerWindow::Create(wxNativeContainerWindowHandle hwnd)
  37 {
  38     if ( !::IsWindow(hwnd) )
  39     {
  40         // strictly speaking, the fact that IsWindow() returns true doesn't
  41         // mean that the window handle is valid -- it could be being deleted
  42         // right now, for example
  43         //
  44         // but if it returns false, the handle is definitely invalid
  45         return false;
  46     }
  47
  48     // make this HWND really a wxWindow
  49     SubclassWin(hwnd);
  50
  51     // inherit the other attributes we can from the native HWND
  52     AdoptAttributesFromHWND();
  53
  54     return true;
  55 }
  56
  57 void wxNativeContainerWindow::OnNativeDestroyed()
  58 {
  59     // don't use Close() or even Destroy() here, we really don't want to keep
  60     // an object using a no more existing HWND around for longer than necessary
  61     delete this;
  62 }
  63
  64 WXLRESULT wxNativeContainerWindow::MSWWindowProc(WXUINT nMsg,
  65                                                  WXWPARAM wParam,
  66                                                  WXLPARAM lParam)
  67 {
  68     if ( nMsg == WM_DESTROY )
  69     {
  70         OnNativeDestroyed();
  71
  72         return 0;
  73     }
  74
  75     return wxTopLevelWindow::MSWWindowProc(nMsg, wParam, lParam);
  76 }
  77
  78 wxNativeContainerWindow::~wxNativeContainerWindow()
  79 {
  80     // prevent the base class dtor from destroying the window, it doesn't
  81     // belong to us so we should leave it alive
  82     DissociateHandle();
  83 }
  84