atkmm: Atk::Value Class Reference

atkmm 2.36.0

The ATK interface implemented by valuators and components which display or select a value from a bounded range of values. More...

#include <atkmm/value.h>

Inheritance diagram for Atk::Value:

[legend]

Public Member Functions
	Value (Value&& src) noexcept

Value&	operator= (Value&& src) noexcept

	~Value () noexcept override

AtkValue*	gobj ()
	Provides access to the underlying C GObject. More...

const AtkValue*	gobj () const
	Provides access to the underlying C GObject. More...

void	get_value_and_text (double& value, Glib::ustring& text)
	Gets the current value and the human readable text alternative. More...

Range	get_range () const
	Gets the range of this object. More...

double	get_increment ()
	Gets the minimum increment by which the value of this object may be changed. More...

void	set_value (const gdouble new_value)
	Sets the value of this object. More...

Glib::SignalProxy< void(double, const Glib::ustring&)>	signal_value_changed ()

Public Member Functions inherited from Glib::Interface
	Interface ()

	Interface (Interface &&src) noexcept

Interface &	operator= (Interface &&src) noexcept

	Interface (const Glib::Interface_Class &interface_class)

	Interface (GObject *castitem)

	~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)

void	get_property_value (const Glib::ustring &property_name, Glib::ValueBase &value) const

void	set_property (const Glib::ustring &property_name, const PropertyType &value)

void	get_property (const Glib::ustring &property_name, PropertyType &value) const

PropertyType	get_property (const Glib::ustring &property_name) const

sigc::connection	connect_property_changed (const Glib::ustring &property_name, const sigc::slot< void()> &slot)

sigc::connection	connect_property_changed (const Glib::ustring &property_name, sigc::slot< void()> &&slot)

void	freeze_notify ()

void	thaw_notify ()

virtual void	reference () const

virtual void	unreference () const

GObject *	gobj ()

const GObject *	gobj () const

GObject *	gobj_copy () const

Public Member Functions inherited from sigc::trackable
	trackable () noexcept

	trackable (const trackable &src) noexcept

	trackable (trackable &&src) noexcept

	~trackable ()

void	add_destroy_notify_callback (notifiable *data, func_destroy_notify func) const

void	notify_callbacks ()

trackable &	operator= (const trackable &src)

trackable &	operator= (trackable &&src) noexcept

void	remove_destroy_notify_callback (notifiable *data) const

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. More...

Protected Member Functions
	Value ()
	You should derive from this class to use it. More...

virtual void	get_current_value_vfunc (Glib::ValueBase& value) const

virtual void	get_maximum_value_vfunc (Glib::ValueBase& value) const

virtual void	get_minimum_value_vfunc (Glib::ValueBase& value) const

Protected Member Functions inherited from Glib::ObjectBase
	ObjectBase ()

	ObjectBase (const char *custom_type_name)

	ObjectBase (const std::type_info &custom_type_info)

	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 Functions
(Note that these are not member functions.)
Glib::RefPtr< Atk::Value >	wrap (AtkValue* object, bool take_copy=false)
	A Glib::wrap() method for this object. More...

Additional Inherited Members
Public Types inherited from sigc::trackable
typedef internal::func_destroy_notify	func_destroy_notify

Public Types inherited from sigc::notifiable
typedef internal::func_destroy_notify	func_destroy_notify

Detailed Description

The ATK interface implemented by valuators and components which display or select a value from a bounded range of values.

This should be implemented for components which either display a value from a bounded range, or which allow the user to specify a value from a bounded range, or both. For instance, most sliders and range controls, as well as dials, should have Atk::Object representations which implement Atk::Value on the component's behalf. Atk::Values may be read-only, in which case attempts to alter the value return false to indicate failure.

Constructor & Destructor Documentation

Atk::Value::Value ( )

protected

You should derive from this class to use it.

Atk::Value::Value ( Value&& src )

noexcept

Atk::Value::~Value ( )

overridenoexcept

Member Function Documentation

static void Atk::Value::add_interface ( GType gtype_implementer )

static

virtual void Atk::Value::get_current_value_vfunc ( Glib::ValueBase & value ) const

protectedvirtual

double Atk::Value::get_increment ( )

Gets the minimum increment by which the value of this object may be changed.

If zero, the minimum increment is undefined, which may mean that it is limited only by the floating point precision of the platform.

Since atkmm 2.12:

Returns: The minimum increment by which the value of this object may be changed. zero if undefined.

virtual void Atk::Value::get_maximum_value_vfunc ( Glib::ValueBase & value ) const

protectedvirtual

virtual void Atk::Value::get_minimum_value_vfunc ( Glib::ValueBase & value ) const

protectedvirtual

Range Atk::Value::get_range ( ) const

Gets the range of this object.

Since atkmm 2.12:

Returns: A newly allocated Atk::Range that represents the minimum, maximum and descriptor (if available) of obj. nullptr if that range is not defined.

static GType Atk::Value::get_type ( )

static

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

void Atk::Value::get_value_and_text	(	double &	value,
		Glib::ustring &	text
	)

Gets the current value and the human readable text alternative.

Since atkmm 2.24:

AtkValue* Atk::Value::gobj ( )

inline

Provides access to the underlying C GObject.

const AtkValue* Atk::Value::gobj ( ) const

inline

Provides access to the underlying C GObject.

Value& Atk::Value::operator= ( Value&& src )

noexcept

void Atk::Value::set_value ( const gdouble new_value )

Sets the value of this object.

This method is intended to provide a way to change the value of the object. In any case, it is possible that the value can't be modified (ie: a read-only component). If the value changes due this call, it is possible that the text could change, and will trigger an Atk::Value::signal_value_changed() signal emission.

Note for implementors: the deprecated set_current_value() method returned true or false depending if the value was assigned or not. In the practice several implementors were not able to decide it, and returned true in any case. For that reason it is not required anymore to return if the value was properly assigned or not.

Since atkmm 2.12:

Parameters

new_value A double which is the desired new accessible value.

Glib::SignalProxy<void(double, const Glib::ustring&)> Atk::Value::signal_value_changed ( )

Slot Prototype:: void on_my_value_changed(double value, const Glib::ustring& text)

Flags: Run Last

The 'value-changed' signal is emitted when the current value that represent the object changes. value is the numerical representation of this new value. text is the human readable text alternative of value, and can be nullptr if it is not available. Note that if there is a textual description associated with the new numeric value, that description should be included regardless of whether or not it has also changed.

Example: a password meter whose value changes as the user types their new password. Appropiate value text would be "weak", "acceptable" and "strong".

Since atkmm 2.12:

Parameters

value	The new value in a numerical form.
text	Human readable text alternative (also called description) of this object. `nullptr` if not available.

Friends And Related Function Documentation

Glib::RefPtr< Atk::Value > wrap	(	AtkValue *	object,
		bool	take_copy = `false`
	)

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.

Public Member Functions

Static Public Member Functions

Protected Member Functions

Related Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation