Struct gtk4::GesturePan
source · #[repr(transparent)]pub struct GesturePan { /* private fields */ }
Expand description
GesturePan
is a Gesture
for pan gestures.
These are drags that are locked to happen along one axis. The axis
that a GesturePan
handles is defined at construct time, and
can be changed through set_orientation()
.
When the gesture starts to be recognized, GesturePan
will
attempt to determine as early as possible whether the sequence
is moving in the expected direction, and denying the sequence if
this does not happen.
Once a panning gesture along the expected axis is recognized,
the pan
signal will be emitted as input
events are received, containing the offset in the given axis.
Properties
orientation
The expected orientation of pan gestures.
Readable | Writeable
GestureSingle
button
Mouse button number to listen to, or 0 to listen for any button.
Readable | Writeable
exclusive
Whether the gesture is exclusive.
Exclusive gestures only listen to pointer and pointer emulated events.
Readable | Writeable
touch-only
Whether the gesture handles only touch events.
Readable | Writeable
Gesture
n-points
The number of touch points that trigger recognition on this gesture.
Readable | Writeable | Construct Only
EventController
name
The name for this controller, typically used for debugging purposes.
Readable | Writeable
propagation-limit
The limit for which events this controller will handle.
Readable | Writeable
propagation-phase
The propagation phase at which this controller will handle events.
Readable | Writeable
widget
The widget receiving the GdkEvents
that the controller will handle.
Readable
Signals
pan
Emitted once a panning gesture along the expected axis is detected.
GestureDrag
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§
source§impl GesturePan
impl GesturePan
sourcepub fn new(orientation: Orientation) -> GesturePan
pub fn new(orientation: Orientation) -> GesturePan
Returns a newly created Gesture
that recognizes pan gestures.
orientation
expected orientation
Returns
a newly created GesturePan
sourcepub fn builder() -> GesturePanBuilder
pub fn builder() -> GesturePanBuilder
Creates a new builder-pattern struct instance to construct GesturePan
objects.
This method returns an instance of GesturePanBuilder
which can be used to create GesturePan
objects.
sourcepub fn orientation(&self) -> Orientation
pub fn orientation(&self) -> Orientation
Returns the orientation of the pan gestures that this @self expects.
Returns
the expected orientation for pan gestures
sourcepub fn set_orientation(&self, orientation: Orientation)
pub fn set_orientation(&self, orientation: Orientation)
sourcepub fn connect_pan<F: Fn(&Self, PanDirection, f64) + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_pan<F: Fn(&Self, PanDirection, f64) + 'static>( &self, f: F ) -> SignalHandlerId
pub fn connect_orientation_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
Trait Implementations§
source§impl Clone for GesturePan
impl Clone for GesturePan
source§impl Debug for GesturePan
impl Debug for GesturePan
source§impl Default for GesturePan
impl Default for GesturePan
source§impl Display for GesturePan
impl Display for GesturePan
source§impl HasParamSpec for GesturePan
impl HasParamSpec for GesturePan
type ParamSpec = ParamSpecObject
§type SetValue = GesturePan
type SetValue = GesturePan
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, GesturePan>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for GesturePan
impl Hash for GesturePan
source§impl Ord for GesturePan
impl Ord for GesturePan
source§impl ParentClassIs for GesturePan
impl ParentClassIs for GesturePan
type Parent = GestureDrag
source§impl<OT: ObjectType> PartialEq<OT> for GesturePan
impl<OT: ObjectType> PartialEq<OT> for GesturePan
source§impl<OT: ObjectType> PartialOrd<OT> for GesturePan
impl<OT: ObjectType> PartialOrd<OT> for GesturePan
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for GesturePan
impl StaticType for GesturePan
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for GesturePan
impl IsA<EventController> for GesturePan
impl IsA<Gesture> for GesturePan
impl IsA<GestureDrag> for GesturePan
impl IsA<GestureSingle> for GesturePan
Auto Trait Implementations§
impl RefUnwindSafe for GesturePan
impl !Send for GesturePan
impl !Sync for GesturePan
impl Unpin for GesturePan
impl UnwindSafe for GesturePan
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