Enum ChangeVerdict 

#[non_exhaustive]
pub enum ChangeVerdict {
    Accept,
    Adjust(TransformFrame),
    Reject,
}

What a geometry constraint decides.

Variants (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.

Accept

Apply ProposedChange::proposed unchanged.

Adjust(TransformFrame)

Apply this frame instead. The delta is re-derived from it, so the preview, the commit, the chrome and the announcement cannot disagree about what happened.

Reject

Apply nothing: this sample leaves the items where the gesture found them.

Exactly equivalent to Adjust(change.start), and deliberately so — a “freeze at the last accepted sample” rejection would need history, and the next accepted sample would then jump by everything the frozen ones travelled. Stateless refusal means a rejected gesture shows nothing happening and resumes the moment the proposal becomes acceptable, and a gesture that ends rejected commits nothing at all — its delta is the identity, so TransformOutcome::Cancelled is what on_end reports.

Trait Implementations

impl Clone for ChangeVerdict

fn clone(&self) -> ChangeVerdict

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ChangeVerdict

impl Debug for ChangeVerdict

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

Formats the value using the given formatter.

impl PartialEq for ChangeVerdict

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ChangeVerdict