Struct Context 

pub struct Context<'a, R: Resolve> {
    pub page: &'a PageForm,
    pub catalog: &'a Dict,
    pub resolve: &'a R,
    pub fonts: &'a FormFonts,
    pub permissions: Permissions,
}

Everything routing needs that is not the session or the event.

A borrowed view rather than an owned context object: it is assembled at the call site from things the caller already has, and it owns nothing.

Examples

Everything here is read from the file before any event is applied; the context borrows it and owns nothing:

use pdfrum_doc::ap;
use pdfrum_form::route::Context;
use pdfrum_form::{FormSession, NoScripts, Permissions, read_page};
// The page's widgets, read once.
let page = read_page(0, &page_dict, &catalog, &resolve);
let mut build = pdfrum_page::BuildContext::new();
// The fonts the form's `/DR` declares.
let fonts = ap::FormFonts::load(&catalog, &resolve, &mut build);

let ctx = Context {
    page: &page,
    catalog: &catalog,
    resolve: &resolve,
    fonts: &fonts,
    permissions: Permissions::ALL,
};
assert_eq!(ctx.page.widgets.len(), 1);

// The session and the cascade are the caller's; the context is rebuilt
// per page, the session outlives every event.
let mut session = FormSession::new();
let mut cascade = NoScripts;

Fields

page: &'a PageForm

The page the event happened on, already read.

catalog: &'a Dict

The document catalog, for the form’s default resources.

resolve: &'a R

The object resolver.

fonts: &'a FormFonts

The fonts the form’s /DR declares.

permissions: Permissions

What the document permits.