#[repr(transparent)]pub struct Gesture { /* private fields */ }
Expand description
Gesture
is the base class for gesture recognition.
Although Gesture
is quite generalized to serve as a base for
multi-touch gestures, it is suitable to implement single-touch and
pointer-based gestures (using the special None
gdk::EventSequence
value for these).
The number of touches that a Gesture
need to be recognized is
controlled by the n-points
property, if a
gesture is keeping track of less or more than that number of sequences,
it won’t check whether the gesture is recognized.
As soon as the gesture has the expected number of touches, it will check
regularly if it is recognized, the criteria to consider a gesture as
“recognized” is left to Gesture
subclasses.
A recognized gesture will then emit the following signals:
begin
when the gesture is recognized.update
, whenever an input event is processed.end
when the gesture is no longer recognized.
Event propagation
In order to receive events, a gesture needs to set a propagation phase
through EventControllerExt::set_propagation_phase()
.
In the capture phase, events are propagated from the toplevel down to the target widget, and gestures that are attached to containers above the widget get a chance to interact with the event before it reaches the target.
In the bubble phase, events are propagated up from the target widget to the toplevel, and gestures that are attached to containers above the widget get a chance to interact with events that have not been handled yet.
States of a sequence
Whenever input interaction happens, a single event may trigger a cascade
of Gesture
s, both across the parents of the widget receiving the
event and in parallel within an individual widget. It is a responsibility
of the widgets using those gestures to set the state of touch sequences
accordingly in order to enable cooperation of gestures around the
gdk::EventSequence
s triggering those.
Within a widget, gestures can be grouped through GestureExt::group_with()
.
Grouped gestures synchronize the state of sequences, so calling
GestureExt::set_state()
on one will effectively propagate
the state throughout the group.
By default, all sequences start out in the EventSequenceState::None
state,
sequences in this state trigger the gesture event handler, but event
propagation will continue unstopped by gestures.
If a sequence enters into the EventSequenceState::Denied
state, the gesture
group will effectively ignore the sequence, letting events go unstopped
through the gesture, but the “slot” will still remain occupied while
the touch is active.
If a sequence enters in the EventSequenceState::Claimed
state, the gesture
group will grab all interaction on the sequence, by:
- Setting the same sequence to
EventSequenceState::Denied
on every other gesture group within the widget, and every gesture on parent widgets in the propagation chain. - Emitting
cancel
on every gesture in widgets underneath in the propagation chain. - Stopping event propagation after the gesture group handles the event.
Note: if a sequence is set early to EventSequenceState::Claimed
on
GDK_TOUCH_BEGIN
/GDK_BUTTON_PRESS
(so those events are captured before
reaching the event widget, this implies PropagationPhase::Capture
), one similar
event will be emulated if the sequence changes to EventSequenceState::Denied
.
This way event coherence is preserved before event propagation is unstopped
again.
Sequence states can’t be changed freely.
See GestureExt::set_state()
to know about the possible
lifetimes of a gdk::EventSequence
.
Touchpad gestures
On the platforms that support it, Gesture
will handle transparently
touchpad gesture events. The only precautions users of Gesture
should
do to enable this support are:
- If the gesture has
PropagationPhase::None
, ensuring events of typeGDK_TOUCHPAD_SWIPE
andGDK_TOUCHPAD_PINCH
are handled by theGesture
This is an Abstract Base Class, you cannot instantiate it.
Properties
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
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
Implementations§
Trait Implementations§
source§impl HasParamSpec for Gesture
impl HasParamSpec for Gesture
source§impl Ord for Gesture
impl Ord for Gesture
source§impl ParentClassIs for Gesture
impl ParentClassIs for Gesture
type Parent = EventController
source§impl<OT: ObjectType> PartialEq<OT> for Gesture
impl<OT: ObjectType> PartialEq<OT> for Gesture
source§impl<OT: ObjectType> PartialOrd<OT> for Gesture
impl<OT: ObjectType> PartialOrd<OT> for Gesture
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 Gesture
impl StaticType for Gesture
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for Gesture
impl IsA<EventController> for Gesture
impl IsA<Gesture> for DragSource
impl IsA<Gesture> for GestureClick
impl IsA<Gesture> for GestureDrag
impl IsA<Gesture> for GestureLongPress
impl IsA<Gesture> for GesturePan
impl IsA<Gesture> for GestureRotate
impl IsA<Gesture> for GestureSingle
impl IsA<Gesture> for GestureStylus
impl IsA<Gesture> for GestureSwipe
impl IsA<Gesture> for GestureZoom
Auto Trait Implementations§
impl RefUnwindSafe for Gesture
impl !Send for Gesture
impl !Sync for Gesture
impl Unpin for Gesture
impl UnwindSafe for Gesture
Blanket Implementations§
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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