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