Split wxPanel in wxPanelBase and platform-specific files.

So far we have only wxMSW-specific implementation (and also a trivial
wxUniv-specific one) but it's still tidier to have all platform-specific code
in separate files, especially as we're going to have more of it for wxMSW
soon.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67251 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/panel.h

@@ -6,13 +6,71 @@
 // Created:
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart
+//              (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
 // Licence:     wxWindows Licence
 /////////////////////////////////////////////////////////////////////////////
 
 #ifndef _WX_PANEL_H_BASE_
 #define _WX_PANEL_H_BASE_
 
-#include "wx/generic/panelg.h"
+// ----------------------------------------------------------------------------
+// headers and forward declarations
+// ----------------------------------------------------------------------------
 
+#include "wx/window.h"
+#include "wx/containr.h"
+
+class WXDLLIMPEXP_FWD_CORE wxControlContainer;
+
+extern WXDLLIMPEXP_DATA_CORE(const char) wxPanelNameStr[];
+
+// ----------------------------------------------------------------------------
+// wxPanel contains other controls and implements TAB traversal between them
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_CORE wxPanelBase : public wxWindow
+{
+public:
+    wxPanelBase();
+
+    // Derived classes should also provide this constructor:
+    /*
+    wxPanelBase(wxWindow *parent,
+                wxWindowID winid = wxID_ANY,
+                const wxPoint& pos = wxDefaultPosition,
+                const wxSize& size = wxDefaultSize,
+                long style = wxTAB_TRAVERSAL | wxNO_BORDER,
+                const wxString& name = wxPanelNameStr);
+    */
+
+    // Pseudo ctor
+    bool Create(wxWindow *parent,
+                wxWindowID winid = wxID_ANY,
+                const wxPoint& pos = wxDefaultPosition,
+                const wxSize& size = wxDefaultSize,
+                long style = wxTAB_TRAVERSAL | wxNO_BORDER,
+                const wxString& name = wxPanelNameStr);
+
+
+    // implementation from now on
+    // --------------------------
+
+    virtual void InitDialog();
+
+    WX_DECLARE_CONTROL_CONTAINER();
+
+private:
+    wxDECLARE_EVENT_TABLE();
+
+    wxDECLARE_NO_COPY_CLASS(wxPanelBase);
+};
+
+#if defined(__WXUNIVERSAL__)
+    #include "wx/univ/panel.h"
+#elif defined(__WXMSW__)
+    #include "wx/msw/panel.h"
+#else
+    #include "wx/generic/panelg.h"
 #endif
-    // _WX_PANELH_BASE_
+
+#endif // _WX_PANELH_BASE_