Struct PointerInfo 

#[non_exhaustive]
pub struct PointerInfo {
    pub id: PointerId,
    pub kind: PointerKind,
    pub primary: bool,
    pub buttons: ButtonMask,
    pub axes: PointerAxes,
    pub time: EventTime,
    pub palm: bool,
}

Everything that identifies and describes the pointer producing a sample.

Carried by PointerSample, ScrollSample and (from stage 1 of the event-shape landing) by the scroll and cancel WidgetEvents.

#[non_exhaustive]: construct one through mouse / touch and adjust fields, so a later field cannot break a call site.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

id: PointerId

Which pointer this is. See the module docs on per-press identity.

kind: PointerKind

What kind of device it is — the axis gesture tuning reads.

primary: bool

The W3C Pointer Events isPrimary flag, which is per kind: every mouse sample is primary, and so is the first contact of a touch sequence. On a machine with both, a mouse and a first finger are both primary at once. It is a property of the sample, set by whoever produced it, and PointerTable never rewrites it.

Not the framework’s singular pointer. The one that drives the legacy singular signals — hovered, the cursor, the one PointerDown a widget that knows nothing of multi-touch sees — is PointerTable::primary, a table-level election that exactly one live pointer holds and that a mouse always wins. A third notion, PointerTable::hover_owner, is the most recent hovering-capable pointer. table.rs’s module docs separate all three; reading this flag as either of the others is the mistake the separation exists to prevent.

buttons: ButtonMask

The buttons held after this sample is applied. A press sets its own bit; a release clears it. Empty for a hovering pointer.

axes: PointerAxes

The continuous axes, where the device reports them.

time: EventTime

When the backend says this sample happened, on the tree’s timeline.

palm: bool

The digitizer classified this contact as a palm rather than a deliberate touch.

Only a backend that advertises reports_palm ever sets it; everything else leaves it false, which is why no existing call site changes meaning. A flagged sample is refused by PointerTable::begin and never reaches a widget: rejecting it at the table is what keeps a hand resting on a tablet from opening menus, and it is one decision rather than one per recognizer.

Implementations

impl PointerInfo

pub const fn mouse(time: EventTime) -> Self

The mouse: PointerId::MOUSE, PointerKind::Mouse, primary, no buttons held, no axes.

This is what every legacy WidgetEvent constructor defaults to, so a call site that says nothing about pointers keeps meaning exactly what it meant before the touch programme.

pub const fn touch(id: PointerId, time: EventTime) -> Self

A touch contact, with the W3C per-kind primary flag clear. A producer that knows this is the first contact of a sequence sets it; the platform translator does. The pointer table’s own election is a separate thing and never writes this field.

pub const fn is_direct(&self) -> bool

Whether the user points at the pixel directly — see PointerKind::is_direct.

pub const fn is_coarse(&self) -> bool

Whether the contact patch is large enough that the reported point is an estimate — see PointerKind::is_coarse.

pub const fn is_precise(&self) -> bool

Whether the reported position is accurate to about a pixel — see PointerKind::is_precise.

pub fn effective_pressure(&self) -> f32

The pressure a consumer should read: the reported value if the device gave one, else 0.5 while any button is down, else 0.0.

This is the W3C Pointer Events Level 3 rule for pressure, and it exists so a pressure-sensitive surface (a brush, a force-touch affordance) has a defined answer for a mouse without special-casing it.

Trait Implementations

impl Clone for PointerInfo

fn clone(&self) -> PointerInfo

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PointerInfo

impl Debug for PointerInfo

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

Formats the value using the given formatter.

impl PartialEq for PointerInfo

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for PointerInfo