Zoom gesture. More...

#include <gtkmm/gesturezoom.h>

Inheritance diagram for Gtk::GestureZoom:

Public Member Functions
	GestureZoom (GestureZoom && src) noexcept

GestureZoom &	operator= (GestureZoom && src) noexcept

	~GestureZoom () noexcept override

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

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

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

double	get_scale_delta () const
	If gesture is active, this function returns the zooming difference since the gesture was recognized (hence the starting point is considered 1:1). More...

Glib::SignalProxy< void, double >	signal_scale_changed ()

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

Gesture &	operator= (Gesture && src) noexcept

	~Gesture () noexcept override

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 () noexcept override

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...

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< GestureZoom >	create (Widget & widget)
	Creates a Gesture that recognizes zoom in/out gestures (usually known as pinch/zoom). More...

Static Public Member Functions inherited from Gtk::Gesture
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
	GestureZoom ()
	There is no create() method that corresponds to this constructor, because this constructor shall only be used by derived classes. More...

	GestureZoom (Widget & widget)
	Constructs a Gesture that recognizes zoom in/out gestures (usually known as pinch/zoom). More...

Protected Member Functions inherited from Gtk::Gesture
	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...

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

Related Functions inherited from Gtk::Gesture
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...

Detailed Description

Zoom gesture.

This is a Gesture implementation able to recognize pinch/zoom gestures. Whenever the distance between both tracked sequences changes, signal_scale_changed() is emitted to report the scale factor.

Since gtkmm 3.14:

Constructor & Destructor Documentation

◆ GestureZoom() [1/3]

Gtk::GestureZoom::GestureZoom ( GestureZoom && src )

noexcept

◆ ~GestureZoom()

Gtk::GestureZoom::~GestureZoom ( )

overridenoexcept

◆ GestureZoom() [2/3]

Gtk::GestureZoom::GestureZoom ( )

protected

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

◆ GestureZoom() [3/3]

Gtk::GestureZoom::GestureZoom ( Widget & widget )

explicitprotected

Constructs a Gesture that recognizes zoom in/out gestures (usually known as pinch/zoom).

Member Function Documentation

◆ create()

static Glib::RefPtr< GestureZoom > Gtk::GestureZoom::create ( Widget & widget )

static

Creates a Gesture that recognizes zoom in/out gestures (usually known as pinch/zoom).

Since gtkmm 3.14:

Parameters

widget Widget the gesture relates to.

Returns: A RefPtr to a new GestureZoom.

◆ get_scale_delta()

double Gtk::GestureZoom::get_scale_delta ( ) const

If gesture is active, this function returns the zooming difference since the gesture was recognized (hence the starting point is considered 1:1).

If gesture is not active, 1 is returned.

Since gtkmm 3.14:

Returns: The scale delta.

◆ get_type()

static GType Gtk::GestureZoom::get_type ( )

static

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

◆ gobj() [1/2]

GtkGestureZoom * Gtk::GestureZoom::gobj ( )

inline

Provides access to the underlying C GObject.

◆ gobj() [2/2]

const GtkGestureZoom * Gtk::GestureZoom::gobj ( ) const

inline

Provides access to the underlying C GObject.

◆ gobj_copy()

GtkGestureZoom * Gtk::GestureZoom::gobj_copy ( )

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

◆ operator=()

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

noexcept

◆ signal_scale_changed()

Glib::SignalProxy< void, double > Gtk::GestureZoom::signal_scale_changed ( )

Slot Prototype:: void on_my_scale_changed(double scale)

Flags: Run First

This signal is emitted whenever the distance between both tracked sequences changes.

Since gtkmm 3.14:

Parameters

scale Scale delta, taking the initial state as 1:1.

Friends And Related Function Documentation

◆ wrap()

Glib::RefPtr< Gtk::GestureZoom > wrap	(	GtkGestureZoom *	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

◆ GestureZoom() [1/3]

◆ ~GestureZoom()

◆ GestureZoom() [2/3]

◆ GestureZoom() [3/3]

Member Function Documentation

◆ create()

◆ get_scale_delta()

◆ get_type()

◆ gobj() [1/2]

◆ gobj() [2/2]

◆ gobj_copy()

◆ operator=()

◆ signal_scale_changed()

Friends And Related Function Documentation

◆ wrap()