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MarkerDrag

tilo_app::reader_hud

Struct MarkerDrag 

pub struct MarkerDrag {
    pub id: String,
    /* private fields */
}
Expand description

A reader begins a drag when a press lands on a marker it owns, tracks the pointer while held, and reads back the marker origin on release to persist the new anchor. Agnostic of the coordinate space (page points vs. screen-y) — the caller decides how to interpret the returned origin.

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§id: String

Opaque to this type.

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impl MarkerDrag

pub const THRESHOLD: f64 = 4.0

Movement (in the caller’s units) past which a press becomes a drag.

pub fn begin( id: impl Into<String>, pointer: (f64, f64), origin: (f64, f64), ) -> MarkerDrag

pub fn update(&mut self, pointer: (f64, f64)) -> (f64, f64)

Returns the marker’s new origin (pointer minus the grab offset). Latches Self::moved once travelled past the threshold from where it started.

pub fn moved(&self) -> bool

Trait Implementations§

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impl Clone for MarkerDrag

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fn clone(&self) -> MarkerDrag

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for MarkerDrag

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

Formats the value using the given formatter. Read more

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impl<T> Any for T
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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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