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// -*- c++ -*-
#ifndef _GLIBMM_OBJECTBASE_H
#define _GLIBMM_OBJECTBASE_H
/* $Id$ */
/* Copyright 2002 The gtkmm Development Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <sigc++/object.h>
#include <typeinfo>
#include <glibmmconfig.h>
#include <glibmm/debug.h>
GTKMM_USING_STD(type_info)
#ifndef DOXYGEN_SHOULD_SKIP_THIS
extern "C" { typedef struct _GObject GObject; }
#endif
namespace Glib
{
#ifndef DOXYGEN_SHOULD_SKIP_THIS
class GSigConnectionNode;
#endif
class ObjectBase : public SigC::Object
{
protected:
// Glib::ObjectBase is used as virtual base class. This means the ObjectBase
// ctor runs before all others -- either implicitly or explicitly. Each of
// the available ctors initializes custom_type_name_ in a different way:
//
// 1) default: custom_type_name_ = "gtkmm__anonymous_custom_type"
// 2) const char*: custom_type_name_ = custom_type_name
// 3) type_info: custom_type_name_ = custom_type_info.name()
//
// All classes generated by gtkmmproc use ctor 2) with custom_type_name = 0,
// which essentially means it's not a custom type. This is used to optimize
// vfunc and signal handler callbacks -- since the C++ virtual methods are
// not overridden, invocation can be skipped.
//
// The default ctor 1) is called implicitly from the ctor of user-derived
// classes -- yes, even if e.g. Gtk::Button calls ctor 2), a derived ctor
// always overrides this choice. The language itself ensures that the ctor
// is only invoked once.
//
// Ctor 3) is a special feature to allow creation of derived types on the
// fly, without having to use g_object_new() manually. This feature is
// sometimes necessary, e.g. to implement a custom Gtk::CellRenderer. The
// neat trick with the virtual base class ctor makes it possible to reuse
// the same direct base class' ctor as with non-custom types.
ObjectBase();
explicit ObjectBase(const char* custom_type_name);
explicit ObjectBase(const std::type_info& custom_type_info);
virtual ~ObjectBase() = 0;
// Called by Glib::Object and Glib::Interface constructors. See comments there.
void initialize(GObject* castitem);
public:
virtual void reference() const; // overrides SigC::ObjectBase::reference()
virtual void unreference() const; // overrides SigC::ObjectBase::unreference()
inline GObject* gobj() { return gobject_; }
inline const GObject* gobj() const { return gobject_; }
// Give a ref-ed copy to someone. Use for direct struct access.
GObject* gobj_copy() const;
#ifndef DOXYGEN_SHOULD_SKIP_THIS
static ObjectBase* _get_current_wrapper(GObject* object);
#endif
protected:
GObject* gobject_; // the GLib/GDK/GTK+ object instance
const char* custom_type_name_;
bool cpp_destruction_in_progress_;
bool is_anonymous_custom_() const;
bool is_derived_() const;
static void destroy_notify_callback_(void* data);
virtual void destroy_notify_();
void _set_current_wrapper(GObject* object);
private:
// noncopyable
ObjectBase(const ObjectBase&);
ObjectBase& operator=(const ObjectBase&);
virtual void set_manage(); // calls g_error()
#ifndef DOXYGEN_SHOULD_SKIP_THIS
friend class Glib::GSigConnectionNode; // for GSigConnectionNode::notify()
#endif
};
bool _gobject_cppinstance_already_deleted(GObject* gobject);
} // namespace Glib
#endif /* _GLIBMM_OBJECTBASE_H */
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