Struct gtk4::EventControllerScroll
source · #[repr(transparent)]pub struct EventControllerScroll { /* private fields */ }
Expand description
EventControllerScroll
is an event controller that handles scroll
events.
It is capable of handling both discrete and continuous scroll
events from mice or touchpads, abstracting them both with the
scroll
signal. Deltas in
the discrete case are multiples of 1.
In the case of continuous scroll events, EventControllerScroll
encloses all scroll
emissions
between two scroll-begin
and
scroll-end
signals.
The behavior of the event controller can be modified by the flags
given at creation time, or modified at a later point through
set_flags()
(e.g. because the scrolling
conditions of the widget changed).
The controller can be set up to emit motion for either/both vertical
and horizontal scroll events through EventControllerScrollFlags::VERTICAL
,
EventControllerScrollFlags::HORIZONTAL
and EventControllerScrollFlags::BOTH_AXES
.
If any axis is disabled, the respective scroll
delta will be 0. Vertical scroll events will be translated to horizontal
motion for the devices incapable of horizontal scrolling.
The event controller can also be forced to emit discrete events on all
devices through EventControllerScrollFlags::DISCRETE
. This can be used
to implement discrete actions triggered through scroll events (e.g.
switching across combobox options).
The EventControllerScrollFlags::KINETIC
flag toggles the emission of the
decelerate
signal, emitted at the end
of scrolling with two X/Y velocity arguments that are consistent with the
motion that was received.
Properties
flags
The flags affecting event controller behavior.
Readable | Writeable
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
decelerate
Emitted after scroll is finished if the
EventControllerScrollFlags::KINETIC
flag is set.
@vel_x and @vel_y express the initial velocity that was imprinted by the scroll events. @vel_x and @vel_y are expressed in pixels/ms.
scroll
Signals that the widget should scroll by the amount specified by @dx and @dy.
For the representation unit of the deltas, see
EventControllerScroll::unit()
.
scroll-begin
Signals that a new scrolling operation has begun.
It will only be emitted on devices capable of it.
scroll-end
Signals that a scrolling operation has finished.
It will only be emitted on devices capable of it.
Implements
Implementations§
source§impl EventControllerScroll
impl EventControllerScroll
sourcepub fn new(flags: EventControllerScrollFlags) -> EventControllerScroll
pub fn new(flags: EventControllerScrollFlags) -> EventControllerScroll
Creates a new event controller that will handle scroll events.
flags
flags affecting the controller behavior
Returns
a new EventControllerScroll
sourcepub fn builder() -> EventControllerScrollBuilder
pub fn builder() -> EventControllerScrollBuilder
Creates a new builder-pattern struct instance to construct EventControllerScroll
objects.
This method returns an instance of EventControllerScrollBuilder
which can be used to create EventControllerScroll
objects.
sourcepub fn flags(&self) -> EventControllerScrollFlags
pub fn flags(&self) -> EventControllerScrollFlags
sourcepub fn unit(&self) -> ScrollUnit
Available on crate feature v4_8
only.
pub fn unit(&self) -> ScrollUnit
v4_8
only.Gets the scroll unit of the last
scroll
signal received.
Always returns gdk::ScrollUnit::Wheel
if the
EventControllerScrollFlags::DISCRETE
flag is set.
Returns
the scroll unit.
sourcepub fn set_flags(&self, flags: EventControllerScrollFlags)
pub fn set_flags(&self, flags: EventControllerScrollFlags)
Sets the flags conditioning scroll controller behavior.
flags
flags affecting the controller behavior
sourcepub fn connect_decelerate<F: Fn(&Self, f64, f64) + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_decelerate<F: Fn(&Self, f64, f64) + 'static>( &self, f: F ) -> SignalHandlerId
Emitted after scroll is finished if the
EventControllerScrollFlags::KINETIC
flag is set.
@vel_x and @vel_y express the initial velocity that was imprinted by the scroll events. @vel_x and @vel_y are expressed in pixels/ms.
vel_x
X velocity
vel_y
Y velocity
sourcepub fn connect_scroll<F: Fn(&Self, f64, f64) -> Inhibit + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_scroll<F: Fn(&Self, f64, f64) -> Inhibit + 'static>( &self, f: F ) -> SignalHandlerId
sourcepub fn connect_scroll_begin<F: Fn(&Self) + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_scroll_begin<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
Signals that a new scrolling operation has begun.
It will only be emitted on devices capable of it.
sourcepub fn connect_scroll_end<F: Fn(&Self) + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_scroll_end<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
Signals that a scrolling operation has finished.
It will only be emitted on devices capable of it.
pub fn connect_flags_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
Trait Implementations§
source§impl Clone for EventControllerScroll
impl Clone for EventControllerScroll
source§impl Debug for EventControllerScroll
impl Debug for EventControllerScroll
source§impl Default for EventControllerScroll
impl Default for EventControllerScroll
source§impl Display for EventControllerScroll
impl Display for EventControllerScroll
source§impl HasParamSpec for EventControllerScroll
impl HasParamSpec for EventControllerScroll
type ParamSpec = ParamSpecObject
§type SetValue = EventControllerScroll
type SetValue = EventControllerScroll
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, EventControllerScroll>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for EventControllerScroll
impl Hash for EventControllerScroll
source§impl Ord for EventControllerScroll
impl Ord for EventControllerScroll
source§impl ParentClassIs for EventControllerScroll
impl ParentClassIs for EventControllerScroll
type Parent = EventController
source§impl<OT: ObjectType> PartialEq<OT> for EventControllerScroll
impl<OT: ObjectType> PartialEq<OT> for EventControllerScroll
source§impl<OT: ObjectType> PartialOrd<OT> for EventControllerScroll
impl<OT: ObjectType> PartialOrd<OT> for EventControllerScroll
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 EventControllerScroll
impl StaticType for EventControllerScroll
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for EventControllerScroll
impl IsA<EventController> for EventControllerScroll
Auto Trait Implementations§
impl RefUnwindSafe for EventControllerScroll
impl !Send for EventControllerScroll
impl !Sync for EventControllerScroll
impl Unpin for EventControllerScroll
impl UnwindSafe for EventControllerScroll
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fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
notify
signal of the object. Read moresource§fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec) + 'static,
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + 'static,
notify
signal of the object. Read moresource§unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec),
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F ) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec),
notify
signal of the object. Read more