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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 <glibmm/signalproxy.h>
#include <glibmm/propertyproxy.h>
#include <sigc++/trackable.h>
#include <typeinfo>
#include <glibmmconfig.h>
#include <glibmm/debug.h>
GLIBMM_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
//This inherits virtually from sigc::trackable so that people can multiply inherit glibmm classes from other sigc::trackable-derived classes.
//See bugzilla.gnome.org bug # 116280
class ObjectBase : virtual public sigc::trackable
{
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:
/// You probably want to use a specific property_*() accessor method instead.
void set_property_value(const Glib::ustring& property_name, const Glib::ValueBase& value);
/// You probably want to use a specific property_*() accessor method instead.
void get_property_value(const Glib::ustring& property_name, Glib::ValueBase& value) const;
/// You probably want to use a specific property_*() accessor method instead.
template <class PropertyType>
void set_property(const Glib::ustring& property_name, const PropertyType& value);
/// You probably want to use a specific property_*() accessor method instead.
template <class PropertyType>
void get_property(const Glib::ustring& property_name, PropertyType& value) const;
virtual void reference() const;
virtual void unreference() const;
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);
bool _cpp_destruction_is_in_progress() const;
#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
};
#ifndef DOXYGEN_SHOULD_SKIP_THIS
template <class PropertyType>
void ObjectBase::set_property(const Glib::ustring& property_name, const PropertyType& value)
{
Glib::Value<PropertyType> property_value;
property_value.init(Glib::Value<PropertyType>::value_type());
property_value.set(value);
this->set_property_value(property_name, property_value);
}
template <class PropertyType>
void ObjectBase::get_property(const Glib::ustring& property_name, PropertyType& value) const
{
Glib::Value<PropertyType> property_value;
property_value.init(Glib::Value<PropertyType>::value_type());
this->get_property_value(property_name, property_value);
value = property_value.get();
}
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
bool _gobject_cppinstance_already_deleted(GObject* gobject);
} // namespace Glib
#endif /* _GLIBMM_OBJECTBASE_H */
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