add support for persistent controls

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58529 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/persist/toplevel.h

@@ -0,0 +1,43 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/persist/toplevel.h
+// Purpose:     interface of wxPersistentTLW
+// Author:      Vadim Zeitlin
+// RCS-ID:      $Id$
+// Copyright:   (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows license
+/////////////////////////////////////////////////////////////////////////////
+
+/**
+    Persistence adapter for wxTopLevelWindow.
+
+    This adapter saves and restores the geometry (i.e. position and size) and
+    the state (iconized, maximized or normal) of top level windows. It can be
+    used with both wxFrame and wxDialog.
+
+    Note that it does @em not save nor restore the window visibility.
+ */
+class wxPersistentTLW : public wxPersistentWindow<wxTopLevelWindow>
+{
+public:
+    /**
+        Constructor.
+
+        @param book
+            The associated window.
+     */
+    wxPersistentTLW(wxTopLevelWindow *book);
+
+    /**
+        Save the current window geometry.
+     */
+    virtual void Save() const;
+
+    /**
+        Restore the window geometry.
+     */
+    virtual bool Restore();
+};
+
+/// Overload allowing persistence adapter creation for wxTopLevelWindow-derived
+/// objects.
+wxPersistentObject *wxCreatePersistentObject(wxTopLevelWindow *book);