Refactor wxDatePickerCtrl to derive from wxDateTimePickerCtrl.

No real changes, just refactor wxMSW wxDatePickerCtrl to allow sharing code
with the upcoming wxTimePickerCtrl class. Even less changes for the other
platforms where wxDateTimePickerCtrl is trivial.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69222 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/datetimectrl.h

@@ -0,0 +1,48 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/timectrl.h
+// Purpose:     Declaration of wxDateTimePickerCtrl class.
+// Author:      Vadim Zeitlin
+// Created:     2011-09-22
+// RCS-ID:      $Id: wxhead.h,v 1.12 2010-04-22 12:44:51 zeitlin Exp $
+// Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_DATETIME_CTRL_H_
+#define _WX_DATETIME_CTRL_H_
+
+#include "wx/defs.h"
+
+#if wxUSE_DATEPICKCTRL
+
+#define wxNEEDS_DATETIMEPICKCTRL
+
+#include "wx/control.h"         // the base class
+
+#include "wx/datetime.h"
+
+// ----------------------------------------------------------------------------
+// wxDateTimePickerCtrl: Private common base class of wx{Date,Time}PickerCtrl.
+// ----------------------------------------------------------------------------
+
+// This class is an implementation detail and should not be used directly, only
+// use the documented API of wxDateTimePickerCtrl and wxTimePickerCtrl.
+class WXDLLIMPEXP_ADV wxDateTimePickerCtrlBase : public wxControl
+{
+public:
+    // Set/get the date or time (in the latter case, time part is ignored).
+    virtual void SetValue(const wxDateTime& dt) = 0;
+    virtual wxDateTime GetValue() const = 0;
+};
+
+// Only MSW currently has any code to share between wxDatePickerCtrl and
+// wxTimePickerCtrl, under the other platforms this class is trivial.
+#if defined(__WXMSW__) && !defined(__WXUNIVERSAL__)
+    #include "wx/msw/datetimectrl.h"
+#else
+    typedef wxDateTimePickerCtrlBase wxDateTimePickerCtrl;
+#endif
+
+#endif // wxUSE_DATEPICKCTRL
+
+#endif // _WX_DATETIME_CTRL_H_