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 // Copyright:   (c) 2008 Vadim Zeitlin <vadim@wxwidgets.org>
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 // ============================================================================
  11 // declarations
  12 // ============================================================================
  13
  14 // ----------------------------------------------------------------------------
  15 // headers
  16 // ----------------------------------------------------------------------------
  17
  18 // for compilers that support precompilation, includes "wx.h".
  19 #include "wx/wxprec.h"
  20
  21 #ifdef __BORLANDC__
  22     #pragma hdrstop
  23 #endif
  24
  25 #ifndef WX_PRECOMP
  26     #include "wx/app.h"
  27     #include "wx/msw/wrapcctl.h"
  28 #endif // WX_PRECOMP
  29
  30 #if wxUSE_DATEPICKCTRL || wxUSE_CALENDARCTRL
  31
  32 #include "wx/msw/private/datecontrols.h"
  33
  34 #include "wx/dynlib.h"
  35
  36 // ============================================================================
  37 // implementation
  38 // ============================================================================
  39
  40 bool wxMSWDateControls::CheckInitialization()
  41 {
  42     // although we already call InitCommonControls() in app.cpp which is
  43     // supposed to initialize all common controls, in comctl32.dll 4.72 (and
  44     // presumably earlier versions 4.70 and 4.71, date time picker not being
  45     // supported in < 4.70 anyhow) it does not do it and we have to initialize
  46     // it explicitly
  47
  48     // this is initially set to -1 to indicate that we need to perform the
  49     // initialization and gets set to false or true depending on its result
  50     static int s_initResult = -1; // MT-ok: used from GUI thread only
  51     if ( s_initResult == -1 )
  52     {
  53         // in any case do nothing the next time, the result won't change and
  54         // it's enough to give the error only once
  55         s_initResult = false;
  56
  57         if ( wxApp::GetComCtl32Version() < 470 )
  58         {
  59             wxLogError(_("This system doesn't support date controls, please upgrade your version of comctl32.dll"));
  60
  61             return false;
  62         }
  63
  64 #if wxUSE_DYNLIB_CLASS
  65         INITCOMMONCONTROLSEX icex;
  66         icex.dwSize = sizeof(icex);
  67         icex.dwICC = ICC_DATE_CLASSES;
  68
  69         // see comment in wxApp::GetComCtl32Version() explaining the
  70         // use of wxLoadedDLL
  71         wxLoadedDLL dllComCtl32(wxT("comctl32.dll"));
  72         if ( dllComCtl32.IsLoaded() )
  73         {
  74             wxLogNull noLog;
  75
  76             typedef BOOL (WINAPI *ICCEx_t)(INITCOMMONCONTROLSEX *);
  77             wxDYNLIB_FUNCTION( ICCEx_t, InitCommonControlsEx, dllComCtl32 );
  78
  79             if ( pfnInitCommonControlsEx )
  80             {
  81                 s_initResult = (*pfnInitCommonControlsEx)(&icex);
  82             }
  83         }
  84 #endif // wxUSE_DYNLIB_CLASS
  85     }
  86
  87     return s_initResult != 0;
  88 }
  89
  90 #endif // wxUSE_DATEPICKCTRL || wxUSE_CALENDARCTRL