gtkmm: Gtk::Gesture Class Reference

Abstract base class for gestures. More...

#include <gtkmm/gesture.h>

Inheritance diagram for Gtk::Gesture:

Public Member Functions
	Gesture (Gesture&& src) noexcept

Gesture&	operator= (Gesture&& src) noexcept

	~Gesture () noexceptoverride

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

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

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

Glib::RefPtr< Gdk::Device >	get_device ()
	Returns the master Gdk::Device that is currently operating on gesture, or `nullptr` if the gesture is not being interacted. More...

Glib::RefPtr< const Gdk::Device >	get_device () const
	Returns the master Gdk::Device that is currently operating on gesture, or `nullptr` if the gesture is not being interacted. More...

bool	set_state (EventSequenceState state)
	Sets the state of all sequences that gesture is currently interacting with. More...

EventSequenceState	get_sequence_state (GdkEventSequence*sequence) const
	Returns the sequence state, as seen by gesture. More...

bool	set_sequence_state (GdkEventSequence*sequence, EventSequenceState state)
	Sets the state of sequence in gesture. More...

std::vector< const GdkEventSequence* >	get_sequences () const
	Returns the list of GdkEventSequences currently being interpreted. More...

GdkEventSequence*	get_last_updated_sequence ()
	Returns the Gdk::EventSequence that was last updated on gesture. More...

const GdkEventSequence*	get_last_updated_sequence () const
	Returns the Gdk::EventSequence that was last updated on gesture. More...

bool	handles_sequence (GdkEventSequence*sequence) const
	Returns `true` if gesture is currently handling events corresponding to sequence. More...

const GdkEvent*	get_last_event (GdkEventSequence*sequence) const
	Returns the last event that was processed for sequence. More...

bool	get_point (GdkEventSequence*sequence, double& x, double& y) const
	If sequence is currently being interpreted by gesture, this function returns `true` and fills in x and y with the last coordinates stored for that event sequence. More...

bool	get_bounding_box (Gdk::Rectangle& rect) const
	If there are touch sequences being currently handled by gesture, this function returns `true` and fills in rect with the bounding box containing all active touches. More...

bool	get_bounding_box_center (double& x, double& y) const
	If there are touch sequences being currently handled by gesture, this function returns `true` and fills in x and y with the center of the bounding box containing all active touches. More...

bool	is_active () const
	Returns `true` if the gesture is currently active. More...

bool	is_recognized () const
	Returns `true` if the gesture is currently recognized. More...

Glib::RefPtr< Gdk::Window >	get_window ()
	Returns the user-defined window that receives the events handled by gesture. More...

Glib::RefPtr< const Gdk::Window >	get_window () const
	Returns the user-defined window that receives the events handled by gesture. More...

void	set_window (const Glib::RefPtr< Gdk::Window >& window)
	Sets a specific window to receive events about, so gesture will effectively handle only events targeting window, or a child of it. More...

void	unset_window ()
	Undoes the effect of previous calls to set_window(), so the gesture will handle events targeting any Gdk::Window that pertains to Gtk::EventController::get_widget(). More...

void	group (const Glib::RefPtr< Gesture >& group_gesture)
	Adds gesture to the same group than group_gesture. More...

void	ungroup ()
	Separates gesture into an isolated group. More...

std::vector< Glib::RefPtr< Gesture > >	get_group ()
	Returns all gestures in the group of gesture. More...

std::vector< Glib::RefPtr< const Gesture > >	get_group () const
	Returns all gestures in the group of gesture. More...

bool	is_grouped_with (const Glib::RefPtr< Gesture >& other) const
	Returns `true` if both gestures pertain to the same group. More...

Glib::SignalProxy< void, GdkEventSequence* >	signal_begin ()

Glib::SignalProxy< void, GdkEventSequence* >	signal_end ()

Glib::SignalProxy< void, GdkEventSequence* >	signal_update ()

Glib::SignalProxy< void, GdkEventSequence* >	signal_cancel ()

Glib::SignalProxy< void, GdkEventSequence*, EventSequenceState >	signal_sequence_state_changed ()

Glib::PropertyProxy_ReadOnly< unsigned int >	property_n_points () const
	The number of touch points that trigger recognition on this gesture,. More...

Glib::PropertyProxy< Glib::RefPtr< Gdk::Window > >	property_window ()
	If non-`nullptr`, the gesture will only listen for events that happen on this Gdk::Window, or a child of it. More...

Glib::PropertyProxy_ReadOnly< Glib::RefPtr< Gdk::Window > >	property_window () const
	If non-`nullptr`, the gesture will only listen for events that happen on this Gdk::Window, or a child of it. More...

Public Member Functions inherited from Gtk::EventController
	EventController (EventController&& src) noexcept

EventController&	operator= (EventController&& src) noexcept

	~EventController () noexceptoverride

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

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

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

Widget*	get_widget ()
	Returns the Gtk::Widget this controller relates to. More...

const Widget*	get_widget () const
	Returns the Gtk::Widget this controller relates to. More...

bool	handle_event (const GdkEvent* event)
	Feeds an events into controller, so it can be interpreted and the controller actions triggered. More...

void	reset ()
	Resets the controller to a clean state. More...

PropagationPhase	get_propagation_phase () const
	Gets the propagation phase at which controller handles events. More...

void	set_propagation_phase (PropagationPhase phase)
	Sets the propagation phase at which a controller handles events. More...

Glib::PropertyProxy_ReadOnly< Widget* >	property_widget () const
	The widget receiving the Gdk::Events that the controller will handle. More...

Glib::PropertyProxy< PropagationPhase >	property_propagation_phase ()
	The propagation phase at which this controller will handle events. More...

Glib::PropertyProxy_ReadOnly< PropagationPhase >	property_propagation_phase () const
	The propagation phase at which this controller will handle events. More...

Public Member Functions inherited from Glib::Object
	Object (const Object &)=delete

Object &	operator= (const Object &)=delete

	Object (Object &&src) noexcept

Object &	operator= (Object &&src) noexcept

void *	get_data (const QueryQuark &key)

void	set_data (const Quark &key, void *data)

void	set_data (const Quark &key, void *data, DestroyNotify notify)

void	remove_data (const QueryQuark &quark)

void *	steal_data (const QueryQuark &quark)

Glib::RefPtr< Glib::Object >	wrap (GObject *object, bool take_copy=false)

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

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

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

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

sigc::connection	connect_property_changed_with_return (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)

	~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

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

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

Protected Member Functions
	Gesture ()
	There is no create() method that corresponds to this constructor, because only derived classes shall be created. More...

Protected Member Functions inherited from Gtk::EventController
	EventController ()
	There is no create() method that corresponds to this constructor, because only derived classes shall be created. More...

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

	Object (const Glib::ConstructParams &construct_params)

	Object (GObject *castitem)

	~Object () noexceptoverride

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< Gtk::Gesture >	wrap (GtkGesture* object, bool take_copy=false)
	A Glib::wrap() method for this object. More...

Related Functions inherited from Gtk::EventController
Glib::RefPtr< Gtk::EventController >	wrap (GtkEventController* object, bool take_copy=false)
	A Glib::wrap() method for this object. More...

Additional Inherited Members
Public Types inherited from Glib::Object
typedef void(*)(gpointer data	DestroyNotify)

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

Detailed Description

Abstract base class for gestures.

This is the base object for gesture recognition. Although this object is quite generalized to serve as a base for multi-touch gestures, it is suitable to implement single-touch and pointer-based gestures (using the special GdkEventSequence value for these).

The number of touches that a Gesture need to be recognized is controlled by the n-points property. If a gesture is keeping track of less or more than that number of sequences, it won't check whether the gesture is recognized.

As soon as the gesture has the expected number of touches, the gesture will run check signal regularly on input events until the gesture is recognized. The criteria to consider a gesture as "recognized" is left to Gesture subclasses.

A recognized gesture will then emit the following signals:

signal_begin() when the gesture is recognized.
A number of signal_update(), whenever an input event is processed.
signal_end() when the gesture is no longer recognized.

Event propagation

In order to receive events, a gesture needs to either set a propagation phase through EventController::set_propagation_phase(), or feed those manually through EventController::handle_event().

In the capture phase, events are propagated from the toplevel down to the target widget, and gestures that are attached to containers above the widget get a chance to interact with the event before it reaches the target.

After the capture phase, GTK+ emits the traditional Widget::signal_button_press_event(), Widget::signal_button_release_event(), Widget::signal_touch_event(), etc. Gestures with the Gtk::PHASE_TARGET phase are fed events from the default Widget::signal_event() handlers.

In the bubble phase, events are propagated up from the target widget to the toplevel, and gestures that are attached to containers above the widget get a chance to interact with events that have not been handled yet.

States of a sequence

Whenever input interaction happens, a single event may trigger a cascade of Gestures, both across the parents of the widget receiving the event and parallelly within an individual widget. It is a responsibility of the widgets using those gestures to set the state of touch sequences accordingly in order to enable cooperation of gestures around the GdkEventSequences triggering those.

Within a widget, gestures can be grouped through group(). Grouped gestures synchronize the state of sequences, so calling set_sequence_state() on one will effectively propagate the state throughout the group.

By default, all sequences start out in the Gtk::EVENT_SEQUENCE_NONE state. Sequences in this state trigger the gesture event handler, but event propagation will continue unstopped by gestures.

If a sequence enters into the Gtk::EVENT_SEQUENCE_DENIED state, the gesture group will effectively ignore the sequence, letting events go unstopped through the gesture, but the "slot" will still remain occupied while the touch is active.

If a sequence enters in the Gtk::EVENT_SEQUENCE_CLAIMED state, the gesture group will grab all interaction on the sequence, by:

Setting the same sequence to Gtk::EVENT_SEQUENCE_DENIED on every other gesture group within the widget, and every gesture on parent widgets in the propagation chain.
emitting signal_cancel() on every gesture in widgets underneath in the propagation chain.
Stopping event propagation after the gesture group handles the event.

Note: If a sequence is set early to Gtk::EVENT_SEQUENCE_CLAIMED on Gdk::TOUCH_BEGIN/Gdk::BUTTON_PRESS (so those events are captured before reaching the event widget, this implies Gtk::PHASE_CAPTURE), one similar event will be emulated if the sequence changes to Gtk::EVENT_SEQUENCE_DENIED. This way event coherence is preserved before event propagation is unstopped again.

Sequence states can't be changed freely, see set_sequence_state() to know about the possible lifetimes of a GdkEventSequence.

Since gtkmm 3.14:

Constructor & Destructor Documentation

Gtk::Gesture::Gesture ( Gesture&& src )

noexcept

Gtk::Gesture::~Gesture ( )

overridenoexcept

Gtk::Gesture::Gesture ( )

protected

There is no create() method that corresponds to this constructor, because only derived classes shall be created.

Member Function Documentation

bool Gtk::Gesture::get_bounding_box ( Gdk::Rectangle& rect ) const

If there are touch sequences being currently handled by gesture, this function returns true and fills in rect with the bounding box containing all active touches.

Otherwise, false will be returned.

Note: This function will yield unexpected results on touchpad gestures. Since there is no correlation between physical and pixel distances, these will look as if constrained in an infinitely small area, rect width and height will thus be 0 regardless of the number of touchpoints.

Since gtkmm 3.14:

Parameters

rect	Bounding box containing all active touches.

Returns: true if there are active touches, false otherwise.

bool Gtk::Gesture::get_bounding_box_center	(	double &	x,
		double &	y
	)		const

If there are touch sequences being currently handled by gesture, this function returns true and fills in x and y with the center of the bounding box containing all active touches.

Otherwise, false will be returned.

Since gtkmm 3.14:

Parameters

x	X coordinate for the bounding box center.
y	Y coordinate for the bounding box center.

Returns: false if no active touches are present, true otherwise.

Glib::RefPtr<Gdk::Device> Gtk::Gesture::get_device ( )

Returns the master Gdk::Device that is currently operating on gesture, or nullptr if the gesture is not being interacted.

Since gtkmm 3.14:

Returns: A Gdk::Device, or nullptr.

Glib::RefPtr<const Gdk::Device> Gtk::Gesture::get_device ( ) const

Returns the master Gdk::Device that is currently operating on gesture, or nullptr if the gesture is not being interacted.

Since gtkmm 3.14:

Returns: A Gdk::Device, or nullptr.

std::vector< Glib::RefPtr<Gesture> > Gtk::Gesture::get_group ( )

Returns all gestures in the group of gesture.

Since gtkmm 3.14:

Returns: The list of Gtk::Gestures.

std::vector< Glib::RefPtr<const Gesture> > Gtk::Gesture::get_group ( ) const

Returns all gestures in the group of gesture.

Since gtkmm 3.14:

Returns: The list of Gtk::Gestures.

const GdkEvent* Gtk::Gesture::get_last_event ( GdkEventSequence * sequence ) const

Returns the last event that was processed for sequence.

Note that the returned pointer is only valid as long as the sequence is still interpreted by the gesture. If in doubt, you should make a copy of the event.

Parameters

sequence A Gdk::EventSequence.

Returns: The last event from sequence.

GdkEventSequence* Gtk::Gesture::get_last_updated_sequence ( )

Returns the Gdk::EventSequence that was last updated on gesture.

Since gtkmm 3.14:

Returns: The last updated sequence.

const GdkEventSequence* Gtk::Gesture::get_last_updated_sequence ( ) const

Returns the Gdk::EventSequence that was last updated on gesture.

Since gtkmm 3.14:

Returns: The last updated sequence.

bool Gtk::Gesture::get_point	(	GdkEventSequence *	sequence,
		double &	x,
		double &	y
	)		const

If sequence is currently being interpreted by gesture, this function returns true and fills in x and y with the last coordinates stored for that event sequence.

The coordinates are always relative to the widget allocation.

Since gtkmm 3.14:

Parameters

sequence	A Gdk::EventSequence, or `nullptr` for pointer events.
x	Return location for X axis of the sequence coordinates.
y	Return location for Y axis of the sequence coordinates.

Returns: true if sequence is currently interpreted.

EventSequenceState Gtk::Gesture::get_sequence_state ( GdkEventSequence * sequence ) const

Returns the sequence state, as seen by gesture.

Since gtkmm 3.14:

Parameters

sequence A Gdk::EventSequence.

Returns: The sequence state in gesture.

std::vector<const GdkEventSequence*> Gtk::Gesture::get_sequences ( ) const

Returns the list of GdkEventSequences currently being interpreted.

Since gtkmm 3.14:

Returns: A std::vector of GdkEventSequence pointers. The GdkEventSequences are owned by GTK+ and must not be freed or modified.

static GType Gtk::Gesture::get_type ( )

static

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

Glib::RefPtr<Gdk::Window> Gtk::Gesture::get_window ( )

Returns the user-defined window that receives the events handled by gesture.

See set_window() for more information.

Since gtkmm 3.14:

Returns: The user defined window, or nullptr if none.

Glib::RefPtr<const Gdk::Window> Gtk::Gesture::get_window ( ) const

Returns the user-defined window that receives the events handled by gesture.

See set_window() for more information.

Since gtkmm 3.14:

Returns: The user defined window, or nullptr if none.

GtkGesture* Gtk::Gesture::gobj ( )

inline

Provides access to the underlying C GObject.

const GtkGesture* Gtk::Gesture::gobj ( ) const

inline

Provides access to the underlying C GObject.

GtkGesture* Gtk::Gesture::gobj_copy ( )

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

void Gtk::Gesture::group ( const Glib::RefPtr< Gesture >& group_gesture )

Adds gesture to the same group than group_gesture.

Gestures are by default isolated in their own groups.

When gestures are grouped, the state of Gdk::EventSequences is kept in sync for all of those, so calling set_sequence_state(), on one will transfer the same value to the others.

Groups also perform an "implicit grabbing" of sequences, if a Gdk::EventSequence state is set to Gtk::EVENT_SEQUENCE_CLAIMED on one group, every other gesture group attached to the same Gtk::Widget will switch the state for that sequence to Gtk::EVENT_SEQUENCE_DENIED.

Since gtkmm 3.14:

Parameters

group_gesture Gtk::Gesture to group gesture with.

bool Gtk::Gesture::handles_sequence ( GdkEventSequence * sequence ) const

Returns true if gesture is currently handling events corresponding to sequence.

Since gtkmm 3.14:

Parameters

sequence A Gdk::EventSequence.

Returns: true if gesture is handling sequence.

bool Gtk::Gesture::is_active ( ) const

Returns true if the gesture is currently active.

A gesture is active meanwhile there are touch sequences interacting with it.

Since gtkmm 3.14:

Returns: true if gesture is active.

bool Gtk::Gesture::is_grouped_with ( const Glib::RefPtr< Gesture >& other ) const

Returns true if both gestures pertain to the same group.

Since gtkmm 3.14:

Parameters

other Another Gtk::Gesture.

Returns: Whether the gestures are grouped.

bool Gtk::Gesture::is_recognized ( ) const

Returns true if the gesture is currently recognized.

A gesture is recognized if there are as many interacting touch sequences as required by gesture, and Gtk::Gesture::signal_check() returned true for the sequences being currently interpreted.

Since gtkmm 3.14:

Returns: true if gesture is recognized.

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

noexcept

Glib::PropertyProxy_ReadOnly< unsigned int > Gtk::Gesture::property_n_points ( ) const

The number of touch points that trigger recognition on this gesture,.

Since gtkmm 3.14:

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

Glib::PropertyProxy< Glib::RefPtr<Gdk::Window> > Gtk::Gesture::property_window ( )

If non-nullptr, the gesture will only listen for events that happen on this Gdk::Window, or a child of it.

Since gtkmm 3.14:

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.

Glib::PropertyProxy_ReadOnly< Glib::RefPtr<Gdk::Window> > Gtk::Gesture::property_window ( ) const

If non-nullptr, the gesture will only listen for events that happen on this Gdk::Window, or a child of it.

Since gtkmm 3.14:

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

bool Gtk::Gesture::set_sequence_state	(	GdkEventSequence *	sequence,
		EventSequenceState	state
	)

Sets the state of sequence in gesture.

Sequences start in state Gtk::EVENT_SEQUENCE_NONE, and whenever they change state, they can never go back to that state. Likewise, sequences in state Gtk::EVENT_SEQUENCE_DENIED cannot turn back to a not denied state. With these rules, the lifetime of an event sequence is constrained to the next four:

None
None → Denied
None → Claimed
None → Claimed → Denied

Note: Due to event handling ordering, it may be unsafe to set the state on another gesture within a Gtk::Gesture::signal_begin() signal handler, as the callback might be executed before the other gesture knows about the sequence. A safe way to perform this could be:

[C example ellipted]

If both gestures are in the same group, just set the state on the gesture emitting the event, the sequence will be already be initialized to the group's global state when the second gesture processes the event.

Since gtkmm 3.14:

Parameters

sequence	A Gdk::EventSequence.
state	The sequence state.

Returns: true if sequence is handled by gesture, and the state is changed successfully.

bool Gtk::Gesture::set_state ( EventSequenceState state )

Sets the state of all sequences that gesture is currently interacting with.

See set_sequence_state() for more details on sequence states.

Since gtkmm 3.14:

Parameters

state The sequence state.

Returns: true if the state of at least one sequence was changed successfully.

void Gtk::Gesture::set_window ( const Glib::RefPtr< Gdk::Window >& window )

Sets a specific window to receive events about, so gesture will effectively handle only events targeting window, or a child of it.

window must pertain to Gtk::EventController::get_widget().

Since gtkmm 3.14:

Parameters

window A Gdk::Window, or nullptr.

Glib::SignalProxy< void,GdkEventSequence* > Gtk::Gesture::signal_begin ( )

Slot Prototype:: void on_my_begin(GdkEventSequence* sequence)

This signal is emitted when the gesture is recognized. This means the number of touch sequences matches Gtk::Gesture::property_n_points(), and the Gtk::Gesture::signal_check() handler(s) returned #true.

Note: These conditions may also happen when an extra touch (eg. a third touch on a 2-touches gesture) is lifted, in that situation sequence won't pertain to the current set of active touches, so don't rely on this being true.

Since gtkmm 3.14:

Parameters

sequence The Gdk::EventSequence that made the gesture to be recognized.

Glib::SignalProxy< void,GdkEventSequence* > Gtk::Gesture::signal_cancel ( )

Slot Prototype:: void on_my_cancel(GdkEventSequence* sequence)

This signal is emitted whenever a sequence is cancelled. This usually happens on active touches when Gtk::EventController::reset() is called on gesture (manually, due to grabs...), or the individual sequence was claimed by parent widgets' controllers (see Gtk::Gesture::set_sequence_state()).

gesture must forget everything about sequence as a reaction to this signal.

Since gtkmm 3.14:

Parameters

sequence The Gdk::EventSequence that was cancelled.

Glib::SignalProxy< void,GdkEventSequence* > Gtk::Gesture::signal_end ( )

Slot Prototype:: void on_my_end(GdkEventSequence* sequence)

This signal is emitted when gesture either stopped recognizing the event sequences as something to be handled (the Gtk::Gesture::signal_check() handler returned false), or the number of touch sequences became higher or lower than Gtk::Gesture::property_n_points().

Note: sequence might not pertain to the group of sequences that were previously triggering recognition on gesture (ie. a just pressed touch sequence that exceeds Gtk::Gesture::property_n_points()). This situation may be detected by checking through Gtk::Gesture::handles_sequence().

Since gtkmm 3.14:

Parameters

sequence The Gdk::EventSequence that made gesture recognition to finish.

Glib::SignalProxy< void,GdkEventSequence*,EventSequenceState > Gtk::Gesture::signal_sequence_state_changed ( )

Slot Prototype:: void on_my_sequence_state_changed(GdkEventSequence* sequence, EventSequenceState state)

This signal is emitted whenever a sequence state changes. See Gtk::Gesture::set_sequence_state() to know more about the expectable sequence lifetimes.

Since gtkmm 3.14:

Parameters

sequence	The Gdk::EventSequence that was cancelled.
state	The new sequence state.

Glib::SignalProxy< void,GdkEventSequence* > Gtk::Gesture::signal_update ( )

Slot Prototype:: void on_my_update(GdkEventSequence* sequence)

This signal is emitted whenever an event is handled while the gesture is recognized. sequence is guaranteed to pertain to the set of active touches.

Since gtkmm 3.14:

Parameters

sequence The Gdk::EventSequence that was updated.

void Gtk::Gesture::ungroup ( )

Separates gesture into an isolated group.

Since gtkmm 3.14:

void Gtk::Gesture::unset_window ( )

Undoes the effect of previous calls to set_window(), so the gesture will handle events targeting any Gdk::Window that pertains to Gtk::EventController::get_widget().

Since gtkmm 3.14:

Friends And Related Function Documentation

Glib::RefPtr< Gtk::Gesture > wrap	(	GtkGesture *	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.

gtkmm: Gtk::Gesture Class Reference

Public Member Functions

Static Public Member Functions

Protected Member Functions

Related Functions

Additional Inherited Members

Detailed Description

Event propagation

States of a sequence

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation