Type Alias PdfStyleFn 

pub type PdfStyleFn = Rc<dyn Fn() -> PdfStyle>;

Supplies the current PdfStyle at paint time. Because PdfView is a persistent entity (not rebuilt by its parent each frame), it reads its colors through this closure — returning fresh colors each call lets the viewer follow live theme changes (and differ per window) without the host pushing updates.

Aliased Type

pub struct PdfStyleFn { /* private fields */ }