Gio::Icon Class Reference

This is a very minimal interface for icons. More...

#include <giomm/icon.h>

Inheritance diagram for Gio::Icon:

Public Member Functions
	Icon (Icon && src) noexcept
Icon &	operator= (Icon && src) noexcept
	~Icon () noexcept override
GIcon *	gobj ()
	Provides access to the underlying C GObject.
const GIcon *	gobj () const
	Provides access to the underlying C GObject.
guint	hash () const
	Gets a hash for an icon.
std::string	to_string () const
	Generates a textual representation of icon that can be used for serialization such as when passing icon to a different process or saving it to persistent storage.
bool	equal (const Glib::RefPtr< Icon > & other) const
Glib::VariantBase	serialize () const
	Serializes a Icon into a Variant.
Public Member Functions inherited from Glib::Interface
	Interface ()
	A Default constructor.
	Interface (Interface && src) noexcept
Interface &	operator= (Interface && src) noexcept
	Interface (const Glib::Interface_Class & interface_class)
	Called by constructors of derived classes.
	Interface (GObject * castitem)
	Called by constructors of derived classes.
	~Interface () noexcept override
	Interface (const Interface &)=delete
Interface &	operator= (const Interface &)=delete
GObject *	gobj ()
const GObject *	gobj () const
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.
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
	You probably want to use a specific property_*() accessor method instead.
template<class PropertyType>
PropertyType	get_property (const Glib::ustring & property_name) const
	You probably want to use a specific property_*() accessor method instead.
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.
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.
void	freeze_notify ()
	Increases the freeze count on object.
void	thaw_notify ()
	Reverts the effect of a previous call to freeze_notify().
virtual void	reference () const
	Increment the reference count for this object.
virtual void	unreference () const
	Decrement the reference count for this object.
GObject *	gobj ()
	Provides access to the underlying C GObject.
const GObject *	gobj () const
	Provides access to the underlying C GObject.
GObject *	gobj_copy () const
	Give a ref-ed copy to someone. Use for direct struct access.

Static Public Member Functions
static void	add_interface (GType gtype_implementer)
static GType	get_type ()
	Get the GType for this class, for use with the underlying GObject type system.
static Glib::RefPtr< Icon >	create (const std::string & str)
	Generate an Icon instance from str.
static Glib::RefPtr< Icon >	deserialize (const Glib::VariantBase & value)
	Deserializes a Icon previously serialized using g_icon_serialize().

Protected Member Functions
	Icon ()
	You should derive from this class to use it.
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.
	ObjectBase (const char * custom_type_name)
	A derived constructor always overrides this choice.
	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.
	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)

Related Symbols
(Note that these are not member symbols.)
Glib::RefPtr< Gio::Icon >	wrap (GIcon * object, bool take_copy=false)
	A Glib::wrap() method for this object.

Detailed Description

This is a very minimal interface for icons.

It provides functions for checking the equality of two icons, hashing of icons and serializing an icon to and from strings and Variants.

Gio::Icon does not provide the actual pixmap for the icon as this is out of GIO's scope. However implementations of Icon may contain the name of an icon (see ThemedIcon), or the path to an icon (see LoadableIcon).

To obtain a hash of an Icon instance, see hash().

To check if two Icon instances are equal, see equal().

For serializing an Icon, use serialize() and deserialize().

Since glibmm 2.16

Constructor & Destructor Documentation

Icon() [1/2]

Gio::Icon::Icon ( )

protected

You should derive from this class to use it.

Icon() [2/2]

Gio::Icon::Icon ( Icon && src )

noexcept

~Icon()

Gio::Icon::~Icon ( )

overridenoexcept

Member Function Documentation

add_interface()

void Gio::Icon::add_interface ( GType gtype_implementer )

static

create()

Glib::RefPtr< Icon > Gio::Icon::create ( const std::string & str )

static

Generate an Icon instance from str.

This function can fail if str is not valid. See to_string() for discussion.

If your application or library provides one or more Icon implementations, you need to ensure that each GType is registered with the type system prior to calling create().

Since glibmm 2.20

Parameters

str	A string obtained via to_string().

Returns

An object implementing the Icon interface, or throws an exception.

Exceptions

Gio::Error

deserialize()

Glib::RefPtr< Icon > Gio::Icon::deserialize ( const Glib::VariantBase & value )

static

Deserializes a Icon previously serialized using g_icon_serialize().

Since glibmm 2.48

Parameters

value

A Variant created with g_icon_serialize().

Returns

A Icon, or nullptr when deserialization fails.

equal()

bool Gio::Icon::equal

(

const Glib::RefPtr< Icon > &

other

)

const

get_type()

GType Gio::Icon::get_type ( )

static

Get the GType for this class, for use with the underlying GObject type system.

gobj() [1/2]

GIcon * Gio::Icon::gobj ( )

inline

Provides access to the underlying C GObject.

gobj() [2/2]

const GIcon * Gio::Icon::gobj ( ) const

inline

Provides access to the underlying C GObject.

hash()

guint Gio::Icon::hash

(

)

const

Gets a hash for an icon.

Returns

A unsigned int containing a hash for the icon, suitable for use in a HashTable or similar data structure.

operator=()

Icon & Gio::Icon::operator= ( Icon && src )

noexcept

serialize()

Glib::VariantBase Gio::Icon::serialize

(

)

const

Serializes a Icon into a Variant.

An equivalent Icon can be retrieved back by calling g_icon_deserialize() on the returned value. As serialization will avoid using raw icon data when possible, it only makes sense to transfer the Variant between processes on the same machine, (as opposed to over the network), and within the same file system namespace.

Since glibmm 2.48

Returns

A Variant, or nullptr when serialization fails. The Variant will not be floating.

to_string()

std::string Gio::Icon::to_string

(

)

const

Generates a textual representation of icon that can be used for serialization such as when passing icon to a different process or saving it to persistent storage.

Use g_icon_new_for_string() to get icon back from the returned string.

The encoding of the returned string is proprietary to Icon except in the following two cases

• If icon is a FileIcon, the returned string is a native path (such as /path/to/my icon.png) without escaping if the File for icon is a native file. If the file is not native, the returned string is the result of g_file_get_uri() (such as sftp://path/to/my%20icon.png).

• If icon is a ThemedIcon with exactly one name and no fallbacks, the encoding is simply the name (such as network-server).

  Since glibmm 2.20

Returns

An allocated NUL-terminated UTF8 string or nullptr if icon can't be serialized.

Friends And Related Symbol Documentation

wrap()

Glib::RefPtr< Gio::Icon > wrap ( GIcon * object, bool take_copy = false )

related

A Glib::wrap() method for this object.

Parameters

object	The C instance.
take_copy	False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns

A C++ instance that wraps this C instance.