src/msw/datecontrols.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/datecontrols.cpp
   3 // Purpose:     implementation of date controls helper functions
   4 // Author:      Vadim Zeitlin
   5 // Created:     2008-04-04
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2008 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/app.h"
  28     #include "wx/msw/wrapcctl.h"
  29 #endif // WX_PRECOMP
  30
  31 #if wxUSE_DATEPICKCTRL || wxUSE_CALENDARCTRL
  32
  33 #include "wx/msw/private/datecontrols.h"
  34
  35 #include "wx/dynlib.h"
  36
  37 // ============================================================================
  38 // implementation
  39 // ============================================================================
  40
  41 bool wxMSWDateControls::CheckInitialization()
  42 {
  43     // although we already call InitCommonControls() in app.cpp which is
  44     // supposed to initialize all common controls, in comctl32.dll 4.72 (and
  45     // presumably earlier versions 4.70 and 4.71, date time picker not being
  46     // supported in < 4.70 anyhow) it does not do it and we have to initialize
  47     // it explicitly
  48
  49     // this is initially set to -1 to indicate that we need to perform the
  50     // initialization and gets set to false or true depending on its result
  51     static int s_initResult = -1; // MT-ok: used from GUI thread only
  52     if ( s_initResult == -1 )
  53     {
  54         // in any case do nothing the next time, the result won't change and
  55         // it's enough to give the error only once
  56         s_initResult = false;
  57
  58         if ( wxApp::GetComCtl32Version() < 470 )
  59         {
  60             wxLogError(_("This system doesn't support date controls, please upgrade your version of comctl32.dll"));
  61
  62             return false;
  63         }
  64
  65 #if wxUSE_DYNLIB_CLASS
  66         INITCOMMONCONTROLSEX icex;
  67         icex.dwSize = sizeof(icex);
  68         icex.dwICC = ICC_DATE_CLASSES;
  69
  70         // see comment in wxApp::GetComCtl32Version() explaining the
  71         // use of wxLoadedDLL
  72         wxLoadedDLL dllComCtl32(wxT("comctl32.dll"));
  73         if ( dllComCtl32.IsLoaded() )
  74         {
  75             wxLogNull noLog;
  76
  77             typedef BOOL (WINAPI *ICCEx_t)(INITCOMMONCONTROLSEX *);
  78             wxDYNLIB_FUNCTION( ICCEx_t, InitCommonControlsEx, dllComCtl32 );
  79
  80             if ( pfnInitCommonControlsEx )
  81             {
  82                 s_initResult = (*pfnInitCommonControlsEx)(&icex);
  83             }
  84         }
  85 #endif // wxUSE_DYNLIB_CLASS
  86     }
  87
  88     return s_initResult != 0;
  89 }
  90
  91 #endif // wxUSE_DATEPICKCTRL || wxUSE_CALENDARCTRL