Added wxTreebook:

- added the control itself
- added protected wxBookCtrlBase::AllowNullPage() to accommodate it
- big changes to the sample to get rid of (most) ugly macros
- added XRC handler for the control
- added docs
- and wxUSE_TREEBOOK everywhere


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35862 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/xrc/xh_treebk.h

@@ -0,0 +1,81 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        xh_treebk.h
+// Purpose:     XML resource handler for wxTreebook
+// Author:      Evgeniy Tarassov
+// Created:     2005/09/28
+// Copyright:   (c) 2005 TT-Solutions <vadim@tt-solutions.com>
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_XH_TREEBK_H_
+#define _WX_XH_TREEBK_H_
+
+#include "wx/xrc/xmlres.h"
+
+#if wxUSE_TREEBOOK
+
+#include "wx/treebook.h"
+
+WX_DEFINE_ARRAY_INT(size_t, wxArrayTbkPageIndexes);
+
+// ---------------------------------------------------------------------
+// wxTreebookXmlHandler class
+// ---------------------------------------------------------------------
+// Resource xml structure have to be almost the "same" as for wxNotebook
+// except the additional (size_t)depth parameter for treebookpage nodes
+// which indicates the depth of the page in the tree.
+// There is only one logical constraint on this parameter :
+// it cannot be greater than the previous page depth plus one
+class WXDLLIMPEXP_XRC wxTreebookXmlHandler : public wxXmlResourceHandler
+{
+DECLARE_DYNAMIC_CLASS(wxTreebookXmlHandler)
+public:
+    wxTreebookXmlHandler();
+    virtual wxObject *DoCreateResource();
+    virtual bool CanHandle(wxXmlNode *node);
+
+private:
+    bool m_isInside;
+    wxTreebook * m_tbk;
+    wxArrayTbkPageIndexes m_treeContext;
+};
+
+
+// Example:
+// -------
+// Label
+// \--First
+// |  \--Second
+// \--Third
+//
+//<resource>
+//  ...
+//  <object class="wxTreebook">
+//    <object class="treebookpage">
+//      <object class="wxWindow" />
+//      <label>My first page</label>
+//      <depth>0</depth>
+//    </object>
+//    <object class="treebookpage">
+//      <object class="wxWindow" />
+//      <label>First</label>
+//      <depth>1</depth>
+//    </object>
+//    <object class="treebookpage">
+//      <object class="wxWindow" />
+//      <label>Second</label>
+//      <depth>2</depth>
+//    </object>
+//    <object class="treebookpage">
+//      <object class="wxWindow" />
+//      <label>Third</label>
+//      <depth>1</depth>
+//    </object>
+//  </object>
+//  ...
+//</resource>
+
+#endif
+
+#endif // _WX_XH_TREEBK_H_
+