add support for persistent controls

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

include/wx/persist/window.h

@@ -0,0 +1,85 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/persist/window.h
+// Purpose:     wxPersistentWindow declaration
+// Author:      Vadim Zeitlin
+// Created:     2009-01-23
+// RCS-ID:      $Id$
+// Copyright:   (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_PERSIST_WINDOW_H_
+#define _WX_PERSIST_WINDOW_H_
+
+#include "wx/persist.h"
+
+#include "wx/window.h"
+
+// ----------------------------------------------------------------------------
+// wxPersistentWindow: base class for persistent windows, uses the window name
+//                     as persistent name by default and automatically reacts
+//                     to the window destruction
+// ----------------------------------------------------------------------------
+
+// type-independent part of wxPersistentWindow
+class wxPersistentWindowBase :
+#if wxEVENTS_COMPATIBILITY_2_8
+    // in compatibility mode we need to derive from wxEvtHandler to be able to
+    // handle events
+    public wxEvtHandler ,
+#endif
+    public wxPersistentObject
+{
+public:
+    wxPersistentWindowBase(wxWindow *win)
+        : wxPersistentObject(win)
+    {
+        win->Connect
+             (
+                wxEVT_DESTROY,
+                wxWindowDestroyEventHandler(
+                    wxPersistentWindowBase::HandleDestroy),
+                NULL,
+                this
+             );
+    }
+
+    virtual wxString GetName() const
+    {
+        const wxString name = GetWindow()->GetName();
+        wxASSERT_MSG( !name.empty(), "persistent windows should be named!" );
+
+        return name;
+    }
+
+protected:
+    wxWindow *GetWindow() const { return static_cast<wxWindow *>(GetObject()); }
+
+private:
+    void HandleDestroy(wxWindowDestroyEvent& event)
+    {
+        event.Skip();
+
+        // this will delete this object itself
+        wxPersistenceManager::Get().SaveAndUnregister(GetWindow());
+    }
+
+    DECLARE_NO_COPY_CLASS(wxPersistentWindowBase)
+};
+
+template <class T>
+class wxPersistentWindow : public wxPersistentWindowBase
+{
+public:
+    typedef T WindowType;
+
+    wxPersistentWindow(WindowType *win)
+        : wxPersistentWindowBase(win)
+    {
+    }
+
+    WindowType *Get() const { return static_cast<WindowType *>(GetWindow()); }
+};
+
+#endif // _WX_PERSIST_WINDOW_H_
+