Struct gtk4::GestureDrag

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

GestureDrag is a Gesture implementation for drags.

The drag operation itself can be tracked throughout the drag-begin, drag-update and drag-end signals, and the relevant coordinates can be extracted through GestureDragExt::offset() and GestureDragExt::start_point().

Signals

drag-begin

Emitted whenever dragging starts.

drag-end

Emitted whenever the dragging is finished.

drag-update

Emitted whenever the dragging point moves.

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

GestureDragExt, GestureSingleExt, GestureExt, EventControllerExt, glib::ObjectExt

Implementations§

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impl GestureDrag

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pub const NONE: Option<&'static GestureDrag> = None

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pub fn new() -> GestureDrag

Returns a newly created Gesture that recognizes drags.

Returns

a newly created GestureDrag

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pub fn builder() -> GestureDragBuilder

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

This method returns an instance of GestureDragBuilder which can be used to create GestureDrag objects.

Trait Implementations§

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impl Clone for GestureDrag

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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 GestureDrag

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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 GestureDrag

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fn default() -> Self

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

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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 GestureDrag

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type ParamSpec = ParamSpecObject

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type SetValue = GestureDrag

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

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fn param_spec_builder() -> Self::BuilderFn

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impl Hash for GestureDrag

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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 GestureDrag

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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 GestureDrag

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

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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 GestureDrag

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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 GestureDrag

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fn static_type() -> Type

Returns the type identifier of Self.
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impl Eq for GestureDrag

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impl IsA<EventController> for GestureDrag

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impl IsA<Gesture> for GestureDrag

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impl IsA<GestureDrag> for GesturePan

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impl IsA<GestureSingle> for GestureDrag

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Gets the TypeId of self. Read more
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Immutably borrows from an owned value. Read more
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unsafe fn from_glib_full_num_as_vec( ptr: *mut GSList, num: usize ) -> Vec<T, Global>

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unsafe fn from_glib_full_as_vec(ptr: *mut GList) -> Vec<T, Global>

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unsafe fn from_glib_full_as_vec(ptr: *mut GPtrArray) -> Vec<T, Global>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_none_as_vec(ptr: *mut GSList) -> Vec<T, Global>

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unsafe fn from_glib_container_as_vec(ptr: *mut GSList) -> Vec<T, Global>

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unsafe fn from_glib_full_as_vec(ptr: *mut GSList) -> Vec<T, Global>

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Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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Sets the property property_name of the object to value value. Read more
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Get the ParamSpec of the property property_name of this object.
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Return all ParamSpec of the properties of this object.
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Freeze all property notifications until the return guard object is dropped. Read more
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Set arbitrary data on this object with the given key. Read more
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Block a given signal handler. Read more
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Unblock a given signal handler.
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Stop emission of the currently emitted signal.
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Stop emission of the currently emitted signal by the (possibly detailed) signal name.
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Limits the lifetime of closure to the lifetime of the object. When the object’s reference count drops to zero, the closure will be invalidated. An invalidated closure will ignore any calls to invoke_with_values, or invoke when using Rust closures.
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fn disconnect(&self, handler_id: SignalHandlerId)

Disconnect a previously connected signal handler.
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Connect to the notify signal of the object. Read more
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Connect to the notify signal of the object. Read more
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fn notify(&self, property_name: &str)

Notify that the given property has changed its value. Read more
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Notify that the given property has changed its value. Read more
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Downgrade this object to a weak reference.
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