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Maurice
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A new book was a cover, a spread and a back cover, so it opened straight onto pages 2 and 3. A bound book does not: the inside of the cover is blank, and the first thing facing the reader is a single right-hand page, page 1. The same at the end, where a single left-hand page sits before the back cover. Both are laid down now, empty, in a new book and in a laid-out one, and they are fixed the way the covers are: an inner spread only ever goes between them. The page numbers follow. They were counted from a spread's position in the array, which assumed the spread after the cover was the first, and three places did that sum on their own. One function now counts along the book, one page for a single leaf and two for a spread, so the sheet on screen and the label in the print view and the folio on the page all say the same number. A book with a first page starts at 1; a book from before the first page existed has none and keeps the numbers it always had.
113 lines
4.1 KiB
TypeScript
113 lines
4.1 KiB
TypeScript
import type { BookPageSetup, BookSpread } from '@trek/shared'
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import { fontStack } from './bookFonts'
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import { folioInk } from './folioColour'
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import { isNumbered } from './bookSheets'
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/**
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* The folios.
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*
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* Drawn by the renderer rather than stored as elements, because the number a
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* page carries is a function of where the spread sits in the book — and an
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* element holding "14" would say 14 after the spread was moved, duplicated or
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* deleted. Nothing else in the document has that property, which is why this is
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* the one thing on the page that is not an element.
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*
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* That also settles where it belongs: inside `SpreadView`, so the editor and
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* the print renderer produce the same number. Stamping them with pdf-lib
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* afterwards would mean proofreading a book on screen whose page numbers are
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* not the ones that get printed.
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*
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* The cover and the back cover carry none. A folio on a cover is a mistake in
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* every book ever bound. The single first and last pages carry one each, on
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* the side of the book they are bound on (#2317).
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*/
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export function PageNumbers({
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spread, page, folios,
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}: {
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spread: BookSpread
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page: BookPageSetup
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/**
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* The numbers this spread carries, from foliosOf: two for a spread, one for
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* a first or last page, none for a cover. Counted by the caller, which has
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* the whole book — a spread on its own does not know how many pages sit
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* before it.
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*/
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folios: readonly number[]
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}) {
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const cfg = page.pageNumbers
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if (!cfg?.show || !isNumbered(spread.role) || folios.length === 0) return null
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/*
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* Which page of the sheet each number sits on. A spread numbers both; the
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* first page is a right-hand leaf and the last a left-hand one, and each
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* carries its one number on the side it actually is.
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*/
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const sides: Array<['left' | 'right', number]> = spread.role === 'inner'
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? [['left', folios[0]], ['right', folios[1]]]
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: [[spread.role === 'first' ? 'right' : 'left', folios[0]]]
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const size = cfg.size
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const y = page.pageHeight - cfg.margin
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/**
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* Where the number sits on each page, given which edge it hangs from.
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*
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* A single page is one page wide, so its number sits at x 0 whichever
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* side of the book it is bound on; the side only decides which edge is
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* the outer one.
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*/
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const place = (side: 'left' | 'right') => {
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const pageX = side === 'left' || spread.role !== 'inner' ? 0 : page.pageWidth
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if (cfg.position === 'centre') {
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return { x: pageX, w: page.pageWidth, align: 'center' as const }
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}
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// Outer is the cut edge, inner is the gutter — the distinction only exists
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// on a spread, and getting it backwards puts both numbers in the fold.
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const outward = cfg.position === 'outer'
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const atLeftEdge = side === 'left' ? outward : !outward
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return atLeftEdge
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? { x: pageX + cfg.margin, w: page.pageWidth * 0.4, align: 'left' as const }
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: { x: pageX + page.pageWidth * 0.6 - cfg.margin, w: page.pageWidth * 0.4, align: 'right' as const }
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}
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return (
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<>
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{sides.map(([side, number]) => {
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const at = place(side)
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/*
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* Sampled at the middle of the number's own box, which is where the
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* digits actually are — the box is 40% of the page wide so that the
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* text can align inside it, and its left edge is often over something
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* else entirely.
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*/
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const ink = cfg.autoColor
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? folioInk(spread, at.x + at.w / 2, y - size * 0.18)
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: { color: cfg.color, shadow: undefined }
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return (
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<div
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key={side}
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style={{
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position: 'absolute',
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left: `${at.x}mm`,
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top: `${y}mm`,
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width: `${at.w}mm`,
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textAlign: at.align,
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fontFamily: fontStack(cfg.font),
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fontSize: `${size}pt`,
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fontWeight: 500,
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letterSpacing: '0.08em',
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lineHeight: 1,
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color: ink.color,
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textShadow: ink.shadow,
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fontVariantNumeric: 'tabular-nums',
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pointerEvents: 'none',
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}}
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>
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{number}
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</div>
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)
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})}
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</>
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)
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}
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