wayland_server::protocol::wl_pointer

Enum Event

Source 
#[non_exhaustive]
pub enum Event<'a> {
    Enter {
        serial: u32,
        surface: WlSurface,
        surface_x: f64,
        surface_y: f64,
    },
    Leave {
        serial: u32,
        surface: WlSurface,
    },
    Motion {
        time: u32,
        surface_x: f64,
        surface_y: f64,
    },
    Button {
        serial: u32,
        time: u32,
        button: u32,
        state: WEnum<ButtonState>,
    },
    Axis {
        time: u32,
        axis: WEnum<Axis>,
        value: f64,
    },
    Frame,
    AxisSource {
        axis_source: WEnum<AxisSource>,
    },
    AxisStop {
        time: u32,
        axis: WEnum<Axis>,
    },
    AxisDiscrete {
        axis: WEnum<Axis>,
        discrete: i32,
    },
    AxisValue120 {
        axis: WEnum<Axis>,
        value120: i32,
    },
    AxisRelativeDirection {
        axis: WEnum<Axis>,
        direction: WEnum<AxisRelativeDirection>,
    },
}

Variants (Non-exhaustive)§

This enum is marked as non-exhaustive
Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.
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Enter

enter event

Notification that this seat’s pointer is focused on a certain surface.

When a seat’s focus enters a surface, the pointer image is undefined and a client should respond to this event by setting an appropriate pointer image with the set_cursor request.

Fields

§serial: u32

serial number of the enter event

§surface: WlSurface

surface entered by the pointer

§surface_x: f64

surface-local x coordinate

§surface_y: f64

surface-local y coordinate

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Leave

leave event

Notification that this seat’s pointer is no longer focused on a certain surface.

The leave notification is sent before the enter notification for the new focus.

Fields

§serial: u32

serial number of the leave event

§surface: WlSurface

surface left by the pointer

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Motion

pointer motion event

Notification of pointer location change. The arguments surface_x and surface_y are the location relative to the focused surface.

Fields

§time: u32

timestamp with millisecond granularity

§surface_x: f64

surface-local x coordinate

§surface_y: f64

surface-local y coordinate

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Button

pointer button event

Mouse button click and release notifications.

The location of the click is given by the last motion or enter event. The time argument is a timestamp with millisecond granularity, with an undefined base.

The button is a button code as defined in the Linux kernel’s linux/input-event-codes.h header file, e.g. BTN_LEFT.

Any 16-bit button code value is reserved for future additions to the kernel’s event code list. All other button codes above 0xFFFF are currently undefined but may be used in future versions of this protocol.

Fields

§serial: u32

serial number of the button event

§time: u32

timestamp with millisecond granularity

§button: u32

button that produced the event

§state: WEnum<ButtonState>

physical state of the button

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Axis

axis event

Scroll and other axis notifications.

For scroll events (vertical and horizontal scroll axes), the value parameter is the length of a vector along the specified axis in a coordinate space identical to those of motion events, representing a relative movement along the specified axis.

For devices that support movements non-parallel to axes multiple axis events will be emitted.

When applicable, for example for touch pads, the server can choose to emit scroll events where the motion vector is equivalent to a motion event vector.

When applicable, a client can transform its content relative to the scroll distance.

Fields

§time: u32

timestamp with millisecond granularity

§axis: WEnum<Axis>

axis type

§value: f64

length of vector in surface-local coordinate space

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Frame

end of a pointer event sequence

Indicates the end of a set of events that logically belong together. A client is expected to accumulate the data in all events within the frame before proceeding.

All wl_pointer events before a wl_pointer.frame event belong logically together. For example, in a diagonal scroll motion the compositor will send an optional wl_pointer.axis_source event, two wl_pointer.axis events (horizontal and vertical) and finally a wl_pointer.frame event. The client may use this information to calculate a diagonal vector for scrolling.

When multiple wl_pointer.axis events occur within the same frame, the motion vector is the combined motion of all events. When a wl_pointer.axis and a wl_pointer.axis_stop event occur within the same frame, this indicates that axis movement in one axis has stopped but continues in the other axis. When multiple wl_pointer.axis_stop events occur within the same frame, this indicates that these axes stopped in the same instance.

A wl_pointer.frame event is sent for every logical event group, even if the group only contains a single wl_pointer event. Specifically, a client may get a sequence: motion, frame, button, frame, axis, frame, axis_stop, frame.

The wl_pointer.enter and wl_pointer.leave events are logical events generated by the compositor and not the hardware. These events are also grouped by a wl_pointer.frame. When a pointer moves from one surface to another, a compositor should group the wl_pointer.leave event within the same wl_pointer.frame. However, a client must not rely on wl_pointer.leave and wl_pointer.enter being in the same wl_pointer.frame. Compositor-specific policies may require the wl_pointer.leave and wl_pointer.enter event being split across multiple wl_pointer.frame groups.

Only available since version 5 of the interface

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AxisSource

axis source event

Source information for scroll and other axes.

This event does not occur on its own. It is sent before a wl_pointer.frame event and carries the source information for all events within that frame.

The source specifies how this event was generated. If the source is wl_pointer.axis_source.finger, a wl_pointer.axis_stop event will be sent when the user lifts the finger off the device.

If the source is wl_pointer.axis_source.wheel, wl_pointer.axis_source.wheel_tilt or wl_pointer.axis_source.continuous, a wl_pointer.axis_stop event may or may not be sent. Whether a compositor sends an axis_stop event for these sources is hardware-specific and implementation-dependent; clients must not rely on receiving an axis_stop event for these scroll sources and should treat scroll sequences from these scroll sources as unterminated by default.

This event is optional. If the source is unknown for a particular axis event sequence, no event is sent. Only one wl_pointer.axis_source event is permitted per frame.

The order of wl_pointer.axis_discrete and wl_pointer.axis_source is not guaranteed.

Only available since version 5 of the interface

Fields

§axis_source: WEnum<AxisSource>

source of the axis event

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AxisStop

axis stop event

Stop notification for scroll and other axes.

For some wl_pointer.axis_source types, a wl_pointer.axis_stop event is sent to notify a client that the axis sequence has terminated. This enables the client to implement kinetic scrolling. See the wl_pointer.axis_source documentation for information on when this event may be generated.

Any wl_pointer.axis events with the same axis_source after this event should be considered as the start of a new axis motion.

The timestamp is to be interpreted identical to the timestamp in the wl_pointer.axis event. The timestamp value may be the same as a preceding wl_pointer.axis event.

Only available since version 5 of the interface

Fields

§time: u32

timestamp with millisecond granularity

§axis: WEnum<Axis>

the axis stopped with this event

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AxisDiscrete

axis click event

Discrete step information for scroll and other axes.

This event carries the axis value of the wl_pointer.axis event in discrete steps (e.g. mouse wheel clicks).

This event is deprecated with wl_pointer version 8 - this event is not sent to clients supporting version 8 or later.

This event does not occur on its own, it is coupled with a wl_pointer.axis event that represents this axis value on a continuous scale. The protocol guarantees that each axis_discrete event is always followed by exactly one axis event with the same axis number within the same wl_pointer.frame. Note that the protocol allows for other events to occur between the axis_discrete and its coupled axis event, including other axis_discrete or axis events. A wl_pointer.frame must not contain more than one axis_discrete event per axis type.

This event is optional; continuous scrolling devices like two-finger scrolling on touchpads do not have discrete steps and do not generate this event.

The discrete value carries the directional information. e.g. a value of -2 is two steps towards the negative direction of this axis.

The axis number is identical to the axis number in the associated axis event.

The order of wl_pointer.axis_discrete and wl_pointer.axis_source is not guaranteed.

Only available since version 5 of the interface

Fields

§axis: WEnum<Axis>

axis type

§discrete: i32

number of steps

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AxisValue120

axis high-resolution scroll event

Discrete high-resolution scroll information.

This event carries high-resolution wheel scroll information, with each multiple of 120 representing one logical scroll step (a wheel detent). For example, an axis_value120 of 30 is one quarter of a logical scroll step in the positive direction, a value120 of -240 are two logical scroll steps in the negative direction within the same hardware event. Clients that rely on discrete scrolling should accumulate the value120 to multiples of 120 before processing the event.

The value120 must not be zero.

This event replaces the wl_pointer.axis_discrete event in clients supporting wl_pointer version 8 or later.

Where a wl_pointer.axis_source event occurs in the same wl_pointer.frame, the axis source applies to this event.

The order of wl_pointer.axis_value120 and wl_pointer.axis_source is not guaranteed.

Only available since version 8 of the interface

Fields

§axis: WEnum<Axis>

axis type

§value120: i32

scroll distance as fraction of 120

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AxisRelativeDirection

axis relative physical direction event

Relative directional information of the entity causing the axis motion.

For a wl_pointer.axis event, the wl_pointer.axis_relative_direction event specifies the movement direction of the entity causing the wl_pointer.axis event. For example:

  • if a user’s fingers on a touchpad move down and this causes a wl_pointer.axis vertical_scroll down event, the physical direction is ‘identical’
  • if a user’s fingers on a touchpad move down and this causes a wl_pointer.axis vertical_scroll up scroll up event (‘natural scrolling’), the physical direction is ‘inverted’.

A client may use this information to adjust scroll motion of components. Specifically, enabling natural scrolling causes the content to change direction compared to traditional scrolling. Some widgets like volume control sliders should usually match the physical direction regardless of whether natural scrolling is active. This event enables clients to match the scroll direction of a widget to the physical direction.

This event does not occur on its own, it is coupled with a wl_pointer.axis event that represents this axis value. The protocol guarantees that each axis_relative_direction event is always followed by exactly one axis event with the same axis number within the same wl_pointer.frame. Note that the protocol allows for other events to occur between the axis_relative_direction and its coupled axis event.

The axis number is identical to the axis number in the associated axis event.

The order of wl_pointer.axis_relative_direction, wl_pointer.axis_discrete and wl_pointer.axis_source is not guaranteed.

Only available since version 9 of the interface

Fields

§axis: WEnum<Axis>

axis type

§direction: WEnum<AxisRelativeDirection>

physical direction relative to axis motion

Implementations§

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impl<'a> Event<'a>

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pub fn opcode(&self) -> u16

Get the opcode number of this message

Trait Implementations§

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impl<'a> Debug for Event<'a>

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<'a> Freeze for Event<'a>

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impl<'a> !RefUnwindSafe for Event<'a>

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impl<'a> Send for Event<'a>

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impl<'a> Sync for Event<'a>

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impl<'a> Unpin for Event<'a>

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impl<'a> !UnwindSafe for Event<'a>

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.