Enum OcgVisibility 

pub enum OcgVisibility {
    Single {
        ocg_id: u32,
        default_visible: bool,
    },
    Membership {
        ocg_ids: Vec<u32>,
        policy: MembershipPolicy,
        default_visible: bool,
    },
    Expression {
        expr: VisibilityExpr,
        default_visible: bool,
    },
}

Visibility predicate for an DisplayElement::OcgGroup.

Three forms exist in PDF:

• Single — a /OC BDC block whose property is a direct OCG ref, or a single-OCG OCMD. Most common case.
• Membership — an OCMD with a /P policy (AllOn / AnyOn / AllOff / AnyOff) over multiple OCGs. PDF default policy is AnyOn.
• Expression — an OCMD with a /VE boolean expression (PDF 1.6+). Most expressive form.

The renderer evaluates the predicate against the active LayerSet (in stet-pdf-reader); each variant’s default_visible is the fallback when the LayerSet has no opinion.

Variants

Single

Visibility tied to a single OCG.

Fields

ocg_id: u32

default_visible: bool

Membership

OCMD with a /P membership policy over a set of OCGs.

Fields

ocg_ids: Vec<u32>

policy: MembershipPolicy

default_visible: bool

Expression

OCMD with a /VE visibility expression.

Fields

expr: VisibilityExpr

default_visible: bool

Implementations

impl OcgVisibility

pub fn single(ocg_id: u32, default_visible: bool) -> OcgVisibility

Convenience constructor for the most common case.

pub fn default_visible(&self) -> bool

The fallback visibility used when no LayerSet has an opinion. Renderers that do not consult a LayerSet read this.

Trait Implementations

impl Clone for OcgVisibility

fn clone(&self) -> OcgVisibility

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OcgVisibility

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

Formats the value using the given formatter.