Struct ContactId 

pub struct ContactId(pub u32);

Input vocabulary, defined in crcbl_core::input and re-exported so a consumer of the event stream needs one use rather than two.

See the crate docs for why these live in crcbl-core. One finger on a touchscreen, for as long as it stays down.

Unique among the contacts that are down at the same moment, stable from the TouchPhase::Began that starts a gesture to the Ended or Cancelled that finishes it, and free to be reused after that. Those three sentences are the whole contract, and the third is the one that bites: a consumer keying per-gesture state off this — which finger is holding the movement stick — must drop that state when the contact ends, or the next finger to land inherits it.

A contact is not a device. Two fingers on one screen are one DeviceId and two ContactIds, which is exactly why the id could not be folded into the device: a per-device registry cannot represent a second finger.

The numbering is the platform’s (a browser pointerId, a wl_touch id, a Win32 pointer id) and is meaningless to compare against a literal or across windows — like Scancode, it exists to be matched against other ids from the same stream.

Tuple Fields

0: u32

Trait Implementations

impl Clone for ContactId

fn clone(&self) -> ContactId

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ContactId

impl Debug for ContactId

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

Formats the value using the given formatter.

impl Default for ContactId

fn default() -> ContactId

Returns the “default value” for a type.

impl Display for ContactId

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

Formats the value using the given formatter.

impl Eq for ContactId

impl Hash for ContactId

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for ContactId

fn cmp(&self, other: &ContactId) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for ContactId

fn eq(&self, other: &ContactId) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for ContactId

fn partial_cmp(&self, other: &ContactId) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for ContactId