Enum FitPolicy 

#[non_exhaustive]
pub enum FitPolicy {
    Exact,
    AdjustSpacing,
    ShrinkToFit,
    ReflowInBounds,
    ExpandBounds,
}

What the engine may do when replacement text does not fit (design §4.3).

Implemented: FitPolicy::Exact and FitPolicy::ShrinkToFit. The rest are reserved and rejected with TextEditError::UnsupportedFitPolicy.

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.

Exact

Same position, font size and spacing; no measurement-based fitting.

AdjustSpacing

Adjust character/word spacing within limits (Phase 2).

ShrinkToFit

Measure the replacement against the space the original occupied and scale the font size down until it fits, to a floor of 50%.

Reports what it did: a shrunk-to-fit diagnostic with the applied percentage, or shrink-floor-reached when the text still overruns at the floor — shrinking further would trade one defect for an unreadable one.

ReflowInBounds

Re-break the replacement onto more lines inside the width the original occupied, keeping the font size — Acrobat’s behaviour when you edit inside a text box, and the natural choice for translations.

Added lines are not pushed away from content below; like Acrobat, no other object on the page moves. Reported as a reflowed diagnostic.

ExpandBounds

Expand the text box within caller-supplied bounds (Phase 2).

Trait Implementations

impl Clone for FitPolicy

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FitPolicy

impl Debug for FitPolicy

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

Formats the value using the given formatter.

impl Eq for FitPolicy

impl PartialEq for FitPolicy

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for FitPolicy

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for FitPolicy