Add documentation for wxPersistentDataViewCtrl

Documentation is trivial, but better than nothing.

interface/wx/persist/dataview.h

@@ -0,0 +1,42 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/persist/dataview.h
+// Purpose:     interface of wxPersistentDataViewCtrl
+// Author:      Vadim Zeitlin
+// Copyright:   (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+/**
+    Persistence adapter for wxDataViewCtrl.
+
+    This adapter handles wxDataViewCtrl column widths and sort order.
+
+    @since 3.1.1
+ */
+class wxPersistentDataViewCtrl : public wxPersistentWindow<wxDataViewCtrl>
+{
+public:
+    /**
+        Constructor.
+
+        @param control The associated control.
+     */
+    wxPersistentDataViewCtrl(wxDataViewCtrl* control);
+
+    /**
+        Save the current column widths and sort order.
+     */
+    void Save() const override;
+
+    /**
+        Restore the column widths and sort order.
+
+        The wxDataViewCtrl must be initialized before calling this function, i.e.
+        all of its columns should be already added to it -- otherwise restoring
+        their width would have no effect.
+     */
+    bool Restore() override;
+};
+
+/// Overload allowing persistence adapter creation for wxDataViewCtrl objects.
+wxPersistentObject *wxCreatePersistentObject(wxDataViewCtrl *book);