A class representing an adjustable bounded value. More...

#include <gtkmm/adjustment.h>

Inherits Glib::Object.

Public Member Functions
	Adjustment (Adjustment && src) noexcept

Adjustment &	operator= (Adjustment && src) noexcept

	~Adjustment () noexcept override

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

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

GtkAdjustment *	gobj_copy ()
	Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More...

void	changed ()
	Emits a "changed" signal from the Adjustment. More...

void	value_changed ()
	Emits a "value_changed" signal from the Adjustment. More...

void	clamp_page (double lower, double upper)
	Updates the Adjustment value to ensure that the range between the parameters lower and upper is in the current page (i.e. between value and value + page_size). More...

void	set_value (double value)
	Sets the current value of the Adjustment. More...

double	get_value () const
	Gets the current value of the adjustment. More...

void	set_lower (double lower)
	Sets the minimum value of the adjustment. More...

double	get_lower () const
	Retrieves the minimum value of the adjustment. More...

void	set_upper (double upper)
	Sets the maximum value of the adjustment. More...

double	get_upper () const
	Retrieves the maximum value of the adjustment. More...

void	set_step_increment (double step_increment)
	Sets the step increment of the adjustment. More...

double	get_step_increment () const
	Retrieves the step increment of the adjustment. More...

void	set_page_increment (double page_increment)
	Sets the page increment of the adjustment. More...

double	get_page_increment () const
	Retrieves the page increment of the adjustment. More...

void	set_page_size (double page_size)
	Sets the page size of the adjustment. More...

double	get_page_size () const
	Retrieves the page size of the adjustment. More...

void	configure (double value, double lower, double upper, double step_increment, double page_increment, double page_size)
	Sets all properties of the adjustment at once. More...

double	get_minimum_increment () const
	Gets the smaller of step increment and page increment. More...

Glib::SignalProxy< void >	signal_changed ()

Glib::SignalProxy< void >	signal_value_changed ()

Glib::PropertyProxy< double >	property_value ()
	The value of the adjustment. More...

Glib::PropertyProxy_ReadOnly< double >	property_value () const
	The value of the adjustment. More...

Glib::PropertyProxy< double >	property_lower ()
	The minimum value of the adjustment. More...

Glib::PropertyProxy_ReadOnly< double >	property_lower () const
	The minimum value of the adjustment. More...

Glib::PropertyProxy< double >	property_upper ()
	The maximum value of the adjustment. More...

Glib::PropertyProxy_ReadOnly< double >	property_upper () const
	The maximum value of the adjustment. More...

Glib::PropertyProxy< double >	property_step_increment ()
	The step increment of the adjustment. More...

Glib::PropertyProxy_ReadOnly< double >	property_step_increment () const
	The step increment of the adjustment. More...

Glib::PropertyProxy< double >	property_page_increment ()
	The page increment of the adjustment. More...

Glib::PropertyProxy_ReadOnly< double >	property_page_increment () const
	The page increment of the adjustment. More...

Glib::PropertyProxy< double >	property_page_size ()
	The page size of the adjustment. More...

Glib::PropertyProxy_ReadOnly< double >	property_page_size () const
	The page size of the adjustment. More...

Static Public Member Functions
static GType	get_type ()
	Get the GType for this class, for use with the underlying GObject type system. More...

static Glib::RefPtr< Adjustment >	create (double value, double lower, double upper, double step_increment=1, double page_increment=10, double page_size=0)

Protected Member Functions
	Adjustment (double value, double lower, double upper, double step_increment=1, double page_increment=10, double page_size=0)
	Constructor to create an Adjustment object. More...

virtual void	on_changed ()
	This is a default handler for the signal signal_changed(). More...

virtual void	on_value_changed ()
	This is a default handler for the signal signal_value_changed(). More...

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

Detailed Description

A class representing an adjustable bounded value.

The Gtk::Adjustment object represents a value which has an associated lower and upper bound, together with step and page increments, and a page size. It is used within several gtkmm widgets, including Gtk::SpinButton, Gtk::Viewport, and Gtk::Range (which is a base class for Gtk::HScrollbar, Gtk::VScrollbar, Gtk::HScale, and Gtk::VScale).

The Gtk::Adjustment object does not update the value itself. Instead it is left up to the owner of the Gtk::Adjustment to control the value.

The owner of the Gtk::Adjustment typically calls the value_changed() and changed() functions after changing the value and its bounds. This results in the emission of the "value_changed" or "changed" signal respectively.

Constructor & Destructor Documentation

◆ Adjustment() [1/2]

Gtk::Adjustment::Adjustment ( Adjustment && src )

noexcept

◆ ~Adjustment()

Gtk::Adjustment::~Adjustment ( )

overridenoexcept

◆ Adjustment() [2/2]

Gtk::Adjustment::Adjustment	(	double	value,
		double	lower,
		double	upper,
		double	step_increment = `1`,
		double	page_increment = `10`,
		double	page_size = `0`
	)

protected

Constructor to create an Adjustment object.

Parameters

value	The initial value
lower	The minimum value
upper	The maximum value
step_increment	The step increment
page_increment	The page increment
page_size	The page size

Member Function Documentation

◆ changed()

void Gtk::Adjustment::changed ( )

Emits a "changed" signal from the Adjustment.

This is typically called by the owner of the Adjustment after it has changed any of the Adjustment fields other than the value.

Deprecated:: GTK+ emits a 'changed' signal itself whenever any of the properties (other than value) change.

◆ clamp_page()

void Gtk::Adjustment::clamp_page	(	double	lower,
		double	upper
	)

Updates the Adjustment value to ensure that the range between the parameters lower and upper is in the current page (i.e. between value and value + page_size).

If this range is larger than the page size, then only the start of it will be in the current page. A "changed" signal will be emitted if the value is changed.

Parameters

lower	The lower value.
upper	The upper value.

◆ configure()

void Gtk::Adjustment::configure	(	double	value,
		double	lower,
		double	upper,
		double	step_increment,
		double	page_increment,
		double	page_size
	)

Sets all properties of the adjustment at once.

Use this function to avoid multiple emissions of the Gtk::Adjustment::signal_changed() signal. See set_lower() for an alternative way of compressing multiple emissions of Gtk::Adjustment::signal_changed() into one.

Since gtkmm 2.14:

Parameters

value	The new value.
lower	The new minimum value.
upper	The new maximum value.
step_increment	The new step increment.
page_increment	The new page increment.
page_size	The new page size.

◆ create()

static Glib::RefPtr< Adjustment > Gtk::Adjustment::create	(	double	value,
		double	lower,
		double	upper,
		double	step_increment = `1`,
		double	page_increment = `10`,
		double	page_size = `0`
	)

static

◆ get_lower()

double Gtk::Adjustment::get_lower ( ) const

Retrieves the minimum value of the adjustment.

Since gtkmm 2.14:

Returns: The current minimum value of the adjustment.

◆ get_minimum_increment()

double Gtk::Adjustment::get_minimum_increment ( ) const

Gets the smaller of step increment and page increment.

Since gtkmm 3.2:

Returns: The minimum increment of adjustment.

◆ get_page_increment()

double Gtk::Adjustment::get_page_increment ( ) const

Retrieves the page increment of the adjustment.

Since gtkmm 2.14:

Returns: The current page increment of the adjustment.

◆ get_page_size()

double Gtk::Adjustment::get_page_size ( ) const

Retrieves the page size of the adjustment.

Since gtkmm 2.14:

Returns: The current page size of the adjustment.

◆ get_step_increment()

double Gtk::Adjustment::get_step_increment ( ) const

Retrieves the step increment of the adjustment.

Since gtkmm 2.14:

Returns: The current step increment of the adjustment.

◆ get_type()

static GType Gtk::Adjustment::get_type ( )

static

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

◆ get_upper()

double Gtk::Adjustment::get_upper ( ) const

Retrieves the maximum value of the adjustment.

Since gtkmm 2.14:

Returns: The current maximum value of the adjustment.

◆ get_value()

double Gtk::Adjustment::get_value ( ) const

Gets the current value of the adjustment.

See set_value().

Returns: The current value of the adjustment.

◆ gobj() [1/2]

GtkAdjustment * Gtk::Adjustment::gobj ( )

inline

Provides access to the underlying C GObject.

◆ gobj() [2/2]

const GtkAdjustment * Gtk::Adjustment::gobj ( ) const

inline

Provides access to the underlying C GObject.

◆ gobj_copy()

GtkAdjustment * Gtk::Adjustment::gobj_copy ( )

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

◆ on_changed()

virtual void Gtk::Adjustment::on_changed ( )

protectedvirtual

This is a default handler for the signal signal_changed().

◆ on_value_changed()

virtual void Gtk::Adjustment::on_value_changed ( )

protectedvirtual

This is a default handler for the signal signal_value_changed().

◆ operator=()

Adjustment & Gtk::Adjustment::operator= ( Adjustment && src )

noexcept

◆ property_lower() [1/2]

Glib::PropertyProxy< double > Gtk::Adjustment::property_lower ( )

The minimum value of the adjustment.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

◆ property_lower() [2/2]

Glib::PropertyProxy_ReadOnly< double > Gtk::Adjustment::property_lower ( ) const

The minimum value of the adjustment.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

◆ property_page_increment() [1/2]

Glib::PropertyProxy< double > Gtk::Adjustment::property_page_increment ( )

The page increment of the adjustment.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

◆ property_page_increment() [2/2]

Glib::PropertyProxy_ReadOnly< double > Gtk::Adjustment::property_page_increment ( ) const

The page increment of the adjustment.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

◆ property_page_size() [1/2]

Glib::PropertyProxy< double > Gtk::Adjustment::property_page_size ( )

The page size of the adjustment.

Note that the page-size is irrelevant and should be set to zero if the adjustment is used for a simple scalar value, e.g. in a Gtk::SpinButton.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

◆ property_page_size() [2/2]

Glib::PropertyProxy_ReadOnly< double > Gtk::Adjustment::property_page_size ( ) const

The page size of the adjustment.

Note that the page-size is irrelevant and should be set to zero if the adjustment is used for a simple scalar value, e.g. in a Gtk::SpinButton.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

◆ property_step_increment() [1/2]

Glib::PropertyProxy< double > Gtk::Adjustment::property_step_increment ( )

The step increment of the adjustment.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

◆ property_step_increment() [2/2]

Glib::PropertyProxy_ReadOnly< double > Gtk::Adjustment::property_step_increment ( ) const

The step increment of the adjustment.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

◆ property_upper() [1/2]

Glib::PropertyProxy< double > Gtk::Adjustment::property_upper ( )

The maximum value of the adjustment.

Note that values will be restricted by upper - page-size if the page-size property is nonzero.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

◆ property_upper() [2/2]

Glib::PropertyProxy_ReadOnly< double > Gtk::Adjustment::property_upper ( ) const

The maximum value of the adjustment.

Note that values will be restricted by upper - page-size if the page-size property is nonzero.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

◆ property_value() [1/2]

Glib::PropertyProxy< double > Gtk::Adjustment::property_value ( )

The value of the adjustment.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

◆ property_value() [2/2]

Glib::PropertyProxy_ReadOnly< double > Gtk::Adjustment::property_value ( ) const

The value of the adjustment.

Since gtkmm 2.4:

Default value: 0

Returns: A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

◆ set_lower()

void Gtk::Adjustment::set_lower ( double lower )

Sets the minimum value of the adjustment.

When setting multiple adjustment properties via their individual setters, multiple Gtk::Adjustment::signal_changed() signals will be emitted. However, since the emission of the Gtk::Adjustment::signal_changed() signal is tied to the emission of the Glib::Object::signal_notify() signals of the changed properties, it’s possible to compress the Gtk::Adjustment::signal_changed() signals into one by calling Glib::object_freeze_notify() and Glib::object_thaw_notify() around the calls to the individual setters.

Alternatively, using a single Glib::object_set() for all the properties to change, or using configure() has the same effect of compressing Gtk::Adjustment::signal_changed() emissions.

Since gtkmm 2.14:

Parameters

lower The new minimum value.

◆ set_page_increment()

void Gtk::Adjustment::set_page_increment ( double page_increment )

Sets the page increment of the adjustment.

See set_lower() about how to compress multiple emissions of the Gtk::Adjustment::signal_changed() signal when setting multiple adjustment properties.

Since gtkmm 2.14:

Parameters

page_increment The new page increment.

◆ set_page_size()

void Gtk::Adjustment::set_page_size ( double page_size )

Sets the page size of the adjustment.

See set_lower() about how to compress multiple emissions of the GtkAdjustment::changed signal when setting multiple adjustment properties.

Since gtkmm 2.14:

Parameters

page_size The new page size.

◆ set_step_increment()

void Gtk::Adjustment::set_step_increment ( double step_increment )

Sets the step increment of the adjustment.

See set_lower() about how to compress multiple emissions of the Gtk::Adjustment::signal_changed() signal when setting multiple adjustment properties.

Since gtkmm 2.14:

Parameters

step_increment The new step increment.

◆ set_upper()

void Gtk::Adjustment::set_upper ( double upper )

Sets the maximum value of the adjustment.

Note that values will be restricted by upper - page-size if the page-size property is nonzero.

See set_lower() about how to compress multiple emissions of the Gtk::Adjustment::signal_changed() signal when setting multiple adjustment properties.

Since gtkmm 2.14:

Parameters

upper The new maximum value.

◆ set_value()

void Gtk::Adjustment::set_value ( double value )

Sets the current value of the Adjustment.

Parameters

value The new value of the Adjustment.

◆ signal_changed()

Glib::SignalProxy< void > Gtk::Adjustment::signal_changed ( )

Slot Prototype:: void on_my_changed()

Flags: Run First, No Recurse

Emitted when one or more of the Gtk::Adjustment properties have been changed, other than the Gtk::Adjustment::property_value() property.

◆ signal_value_changed()

Glib::SignalProxy< void > Gtk::Adjustment::signal_value_changed ( )

Slot Prototype:: void on_my_value_changed()

Flags: Run First, No Recurse

Emitted when the Gtk::Adjustment::property_value() property has been changed.

◆ value_changed()

void Gtk::Adjustment::value_changed ( )

Emits a "value_changed" signal from the Adjustment.

This is typically called by the owner of the Adjustment after it has changed the Adjustment value field.

Deprecated:: GTK+ emits a 'value_changed' signal itself whenever the value changes.

Friends And Related Function Documentation

◆ wrap()

Glib::RefPtr< Gtk::Adjustment > wrap	(	GtkAdjustment *	object,
		bool	take_copy = `false`
	)

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

Detailed Description

Constructor & Destructor Documentation

◆ Adjustment() [1/2]

◆ ~Adjustment()

◆ Adjustment() [2/2]

Member Function Documentation

◆ changed()

◆ clamp_page()

◆ configure()

◆ create()

◆ get_lower()

◆ get_minimum_increment()

◆ get_page_increment()

◆ get_page_size()

◆ get_step_increment()

◆ get_type()

◆ get_upper()

◆ get_value()

◆ gobj() [1/2]

◆ gobj() [2/2]

◆ gobj_copy()

◆ on_changed()

◆ on_value_changed()

◆ operator=()

◆ property_lower() [1/2]

◆ property_lower() [2/2]

◆ property_page_increment() [1/2]

◆ property_page_increment() [2/2]

◆ property_page_size() [1/2]

◆ property_page_size() [2/2]

◆ property_step_increment() [1/2]

◆ property_step_increment() [2/2]

◆ property_upper() [1/2]

◆ property_upper() [2/2]

◆ property_value() [1/2]

◆ property_value() [2/2]

◆ set_lower()

◆ set_page_increment()

◆ set_page_size()

◆ set_step_increment()

◆ set_upper()

◆ set_value()

◆ signal_changed()

◆ signal_value_changed()

◆ value_changed()

Friends And Related Function Documentation

◆ wrap()