Struct gtk4::GestureSwipe

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#[repr(transparent)]
pub struct GestureSwipe { /* private fields */ }
Expand description

GestureSwipe is a Gesture for swipe gestures.

After a press/move/…/move/release sequence happens, the swipe signal will be emitted, providing the velocity and directionality of the sequence at the time it was lifted.

If the velocity is desired in intermediate points, velocity() can be called in a update handler.

All velocities are reported in pixels/sec units.

Signals

swipe

Emitted when the recognized gesture is finished.

Velocity and direction are a product of previously recorded events.

Gesture

begin

Emitted when the gesture is recognized.

This means the number of touch sequences matches n-points.

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.

cancel

Emitted whenever a sequence is cancelled.

This usually happens on active touches when EventControllerExt::reset() is called on @gesture (manually, due to grabs…), or the individual @sequence was claimed by parent widgets’ controllers (see GestureExt::set_sequence_state()).

@gesture must forget everything about @sequence as in response to this signal.

end

Emitted when @gesture either stopped recognizing the event sequences as something to be handled, or the number of touch sequences became higher or lower than 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 n-points). This situation may be detected by checking through GestureExt::handles_sequence().

sequence-state-changed

Emitted whenever a sequence state changes.

See GestureExt::set_sequence_state() to know more about the expectable sequence lifetimes.

update

Emitted whenever an event is handled while the gesture is recognized.

@sequence is guaranteed to pertain to the set of active touches.

Implements

GestureSingleExt, GestureExt, EventControllerExt, glib::ObjectExt

Implementations§

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impl GestureSwipe

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pub fn new() -> GestureSwipe

Returns a newly created Gesture that recognizes swipes.

Returns

a newly created GestureSwipe

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pub fn builder() -> GestureSwipeBuilder

Creates a new builder-pattern struct instance to construct GestureSwipe objects.

This method returns an instance of GestureSwipeBuilder which can be used to create GestureSwipe objects.

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pub fn velocity(&self) -> Option<(f64, f64)>

Gets the current velocity.

If the gesture is recognized, this function returns true and fills in @velocity_x and @velocity_y with the recorded velocity, as per the last events processed.

Returns

whether velocity could be calculated

velocity_x

return value for the velocity in the X axis, in pixels/sec

velocity_y

return value for the velocity in the Y axis, in pixels/sec

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pub fn connect_swipe<F: Fn(&Self, f64, f64) + 'static>( &self, f: F ) -> SignalHandlerId

Emitted when the recognized gesture is finished.

Velocity and direction are a product of previously recorded events.

velocity_x

velocity in the X axis, in pixels/sec

velocity_y

velocity in the Y axis, in pixels/sec

Trait Implementations§

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impl Clone for GestureSwipe

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for GestureSwipe

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for GestureSwipe

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl Display for GestureSwipe

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl HasParamSpec for GestureSwipe

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type ParamSpec = ParamSpecObject

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type SetValue = GestureSwipe

Preferred value to be used as setter for the associated ParamSpec.
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type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, GestureSwipe>

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fn param_spec_builder() -> Self::BuilderFn

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impl Hash for GestureSwipe

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fn hash<H>(&self, state: &mut H)where H: Hasher,

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for GestureSwipe

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fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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impl ParentClassIs for GestureSwipe

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impl<OT: ObjectType> PartialEq<OT> for GestureSwipe

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fn eq(&self, other: &OT) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<OT: ObjectType> PartialOrd<OT> for GestureSwipe

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fn partial_cmp(&self, other: &OT) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl StaticType for GestureSwipe

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fn static_type() -> Type

Returns the type identifier of Self.
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impl Eq for GestureSwipe

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impl IsA<EventController> for GestureSwipe

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impl IsA<Gesture> for GestureSwipe

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impl IsA<GestureSingle> for GestureSwipe

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<Super, Sub> CanDowncast<Sub> for Superwhere Super: IsA<Super>, Sub: IsA<Super>,

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impl<'a, T, C, E> FromValueOptional<'a> for Twhere T: FromValue<'a, Checker = C>, C: ValueTypeChecker<Error = ValueTypeMismatchOrNoneError<E>>, E: Error + Send + 'static,