A convenience class for named custom types. More...

#include <glibmm/extraclassinit.h>

Inheritance diagram for Glib::ExtraClassInit:

Protected Member Functions
	ExtraClassInit (GClassInitFunc class_init_func, void* class_data=nullptr, GInstanceInitFunc instance_init_func=nullptr)
	Constructor. More...
Protected Member Functions inherited from Glib::ObjectBase
	ObjectBase ()
	This default constructor is called implicitly from the constructor of user-derived classes, even if, for instance, Gtk::Button calls a different ObjectBase constructor. More...
	ObjectBase (const char* custom_type_name)
	A derived constructor always overrides this choice. More...
	ObjectBase (const std::type_info& custom_type_info)
	This constructor is a special feature to allow creation of derived types on the fly, without having to use g_object_new() manually. More...
	ObjectBase (ObjectBase&& src) noexcept
ObjectBase&	operator= (ObjectBase&& src) noexcept
virtual	~ObjectBase () noexcept=0
void	initialize (GObject* castitem)
void	initialize_move (GObject* castitem, Glib::ObjectBase* previous_wrapper)

Additional Inherited Members
Public Types inherited from sigc::trackable
typedef internal::func_destroy_notify	func_destroy_notify
Public Member Functions inherited from Glib::ObjectBase
	ObjectBase (const ObjectBase&)=delete
ObjectBase&	operator= (const ObjectBase&)=delete
void	set_property_value (const Glib::ustring& property_name, const Glib::ValueBase& value)
	You probably want to use a specific property_*() accessor method instead. More...
void	get_property_value (const Glib::ustring& property_name, Glib::ValueBase& value) const
	You probably want to use a specific property_*() accessor method instead. More...
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. More...
template<class PropertyType >
void	get_property (const Glib::ustring& property_name, PropertyType& value) const
	You probably want to use a specific property_*() accessor method instead. More...
template<class PropertyType >
PropertyType	get_property (const Glib::ustring& property_name) const
	You probably want to use a specific property_*() accessor method instead. More...
sigc::connection	connect_property_changed (const Glib::ustring& property_name, const sigc::slot< void()>& slot)
	You can use the signal_changed() signal of the property proxy instead. More...
sigc::connection	connect_property_changed (const Glib::ustring& property_name, sigc::slot< void()>&& slot)
	You can use the signal_changed() signal of the property proxy instead. More...
void	freeze_notify ()
	Increases the freeze count on object. More...
void	thaw_notify ()
	Reverts the effect of a previous call to freeze_notify(). More...
virtual void	reference () const
	Increment the reference count for this object. More...
virtual void	unreference () const
	Decrement the reference count for this object. More...
GObject*	gobj ()
	Provides access to the underlying C GObject. More...
const GObject*	gobj () const
	Provides access to the underlying C GObject. More...
GObject*	gobj_copy () const
	Give a ref-ed copy to someone. Use for direct struct access. More...
Public Member Functions inherited from sigc::trackable
	trackable () noexcept
	trackable (const trackable &src) noexcept
	trackable (trackable &&src)
	~trackable ()
void	add_destroy_notify_callback (void *data, func_destroy_notify func) const
void	notify_callbacks ()
trackable &	operator= (const trackable &src)
trackable &	operator= (trackable &&src)
void	remove_destroy_notify_callback (void *data) const

Detailed Description

A convenience class for named custom types.

Use it if you need to add code to GType's class init function and/or need an instance init function. Example:

#include <glibmm/extraclassinit.h>

class MyExtraInit : public Glib::ExtraClassInit
{
public:
  MyExtraInit(const Glib::ustring& css_name)
  :
  Glib::ExtraClassInit(my_extra_class_init_function, &m_css_name, my_instance_init_function),
  m_css_name(css_name)
  { }

private:
  static void my_extra_class_init_function(void* g_class, void* class_data)
  {
    const auto klass = static_cast<GtkWidgetClass*>(g_class);
    const auto css_name = static_cast<Glib::ustring*>(class_data);
    gtk_widget_class_set_css_name(klass, css_name->c_str());
  }
  static void my_instance_init_function(GTypeInstance* instance, void* g_class)
  {
    gtk_widget_set_has_window(GTK_WIDGET(instance), true);
  }

  Glib::ustring m_css_name;
};

class MyWidget : public Gtk::WidgetCustomDraw, public MyExtraInit, public Gtk::Widget
{
public:
  MyWidget()
  :
  // The GType name will be gtkmm__CustomObject_MyMidget
  Glib::ObjectBase("MyWidget"), // Unique class name
  Gtk::WidgetCustomDraw(),
  MyExtraInit("my-widget"),
  Gtk::Widget()
  {
    // ...
  }
  // ...
};

Note

Classes derived from ExtraClassInit (Gtk::WidgetCustomDraw and MyExtraInit in the example) must be listed before Glib::Object or a class derived from Glib::Object (Gtk::Widget in the example) in the list of base classes.

Since glibmm 2.52:

Constructor & Destructor Documentation

Glib::ExtraClassInit::ExtraClassInit ( GClassInitFunc  class_init_func, void *  class_data = nullptr, GInstanceInitFunc  instance_init_func = nullptr  )

explicitprotected

Constructor.

Parameters

class_init_func	Pointer to an extra class init function. nullptr, if no extra class init function is needed.
class_data	Class data pointer, passed to the class init function. Can be nullptr, if the class init function does not need it.
instance_init_func	Pointer to an instance init function. nullptr, if no instance init function is needed.