extract (and expand and clean up and document) the header window implementation used inside the generic wxDataViewCtrl in a separate wxHeaderCtrl class which could be reused in (generic) wxListCtrl and, most importantly, wxGrid later

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57093 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/headerctrlg.cpp

@@ -0,0 +1,37 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        src/generic/headerctrlg.cpp
+// Purpose:     generic wxHeaderCtrl implementation
+// Author:      Vadim Zeitlin
+// Created:     2008-12-03
+// RCS-ID:      $Id$
+// Copyright:   (c) 2008 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// for compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+#endif // WX_PRECOMP
+
+#include "wx/headerctrl.h"
+
+#ifdef wxHAS_GENERIC_HEADERCTRL
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+#endif // wxHAS_GENERIC_HEADERCTRL