File size: 8,883 Bytes
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import { createTOCView } from './ui/tree.js'
import { createMenu } from './ui/menu.js'
import { Overlayer } from './overlayer.js'
const getCSS = ({ spacing, justify, hyphenate }) => `
@namespace epub "http://www.idpf.org/2007/ops";
html {
color-scheme: light dark;
}
/* https://github.com/whatwg/html/issues/5426 */
@media (prefers-color-scheme: dark) {
a:link {
color: lightblue;
}
}
p, li, blockquote, dd {
line-height: ${spacing};
text-align: ${justify ? 'justify' : 'start'};
-webkit-hyphens: ${hyphenate ? 'auto' : 'manual'};
hyphens: ${hyphenate ? 'auto' : 'manual'};
-webkit-hyphenate-limit-before: 3;
-webkit-hyphenate-limit-after: 2;
-webkit-hyphenate-limit-lines: 2;
hanging-punctuation: allow-end last;
widows: 2;
}
/* prevent the above from overriding the align attribute */
[align="left"] { text-align: left; }
[align="right"] { text-align: right; }
[align="center"] { text-align: center; }
[align="justify"] { text-align: justify; }
pre {
white-space: pre-wrap !important;
}
aside[epub|type~="endnote"],
aside[epub|type~="footnote"],
aside[epub|type~="note"],
aside[epub|type~="rearnote"] {
display: none;
}
`
const $ = document.querySelector.bind(document)
const locales = 'en'
const percentFormat = new Intl.NumberFormat(locales, { style: 'percent' })
const listFormat = new Intl.ListFormat(locales, { style: 'short', type: 'conjunction' })
const formatLanguageMap = x => {
if (!x) return ''
if (typeof x === 'string') return x
const keys = Object.keys(x)
return x[keys[0]]
}
const formatOneContributor = contributor => typeof contributor === 'string'
? contributor : formatLanguageMap(contributor?.name)
const formatContributor = contributor => Array.isArray(contributor)
? listFormat.format(contributor.map(formatOneContributor))
: formatOneContributor(contributor)
class Reader {
#tocView
style = {
spacing: 1.4,
justify: true,
hyphenate: true,
}
annotations = new Map()
annotationsByValue = new Map()
closeSideBar() {
$('#dimming-overlay').classList.remove('show')
$('#side-bar').classList.remove('show')
}
constructor() {
$('#side-bar-button').addEventListener('click', () => {
$('#dimming-overlay').classList.add('show')
$('#side-bar').classList.add('show')
})
$('#dimming-overlay').addEventListener('click', () => this.closeSideBar())
const menu = createMenu([
{
name: 'layout',
label: 'Layout',
type: 'radio',
items: [
['Paginated', 'paginated'],
['Scrolled', 'scrolled'],
],
onclick: value => {
this.view?.renderer.setAttribute('flow', value)
},
},
])
menu.element.classList.add('menu')
$('#menu-button').append(menu.element)
$('#menu-button > button').addEventListener('click', () =>
menu.element.classList.toggle('show'))
menu.groups.layout.select('paginated')
}
async open(file) {
this.view = document.createElement('foliate-view')
document.body.append(this.view)
await this.view.open(file)
this.view.addEventListener('load', this.#onLoad.bind(this))
this.view.addEventListener('relocate', this.#onRelocate.bind(this))
const { book } = this.view
book.transformTarget?.addEventListener('data', ({ detail }) => {
detail.data = Promise.resolve(detail.data).catch(e => {
console.error(new Error(`Failed to load ${detail.name}`, { cause: e }))
return ''
})
})
this.view.renderer.setStyles?.(getCSS(this.style))
this.view.renderer.next()
$('#header-bar').style.visibility = 'visible'
$('#nav-bar').style.visibility = 'visible'
$('#left-button').addEventListener('click', () => this.view.goLeft())
$('#right-button').addEventListener('click', () => this.view.goRight())
const slider = $('#progress-slider')
slider.dir = book.dir
slider.addEventListener('input', e =>
this.view.goToFraction(parseFloat(e.target.value)))
for (const fraction of this.view.getSectionFractions()) {
const option = document.createElement('option')
option.value = fraction
$('#tick-marks').append(option)
}
document.addEventListener('keydown', this.#handleKeydown.bind(this))
const title = formatLanguageMap(book.metadata?.title) || 'Untitled Book'
document.title = title
$('#side-bar-title').innerText = title
$('#side-bar-author').innerText = formatContributor(book.metadata?.author)
Promise.resolve(book.getCover?.())?.then(blob =>
blob ? $('#side-bar-cover').src = URL.createObjectURL(blob) : null)
const toc = book.toc
if (toc) {
this.#tocView = createTOCView(toc, href => {
this.view.goTo(href).catch(e => console.error(e))
this.closeSideBar()
})
$('#toc-view').append(this.#tocView.element)
}
// load and show highlights embedded in the file by Calibre
const bookmarks = await book.getCalibreBookmarks?.()
if (bookmarks) {
const { fromCalibreHighlight } = await import('./epubcfi.js')
for (const obj of bookmarks) {
if (obj.type === 'highlight') {
const value = fromCalibreHighlight(obj)
const color = obj.style.which
const note = obj.notes
const annotation = { value, color, note }
const list = this.annotations.get(obj.spine_index)
if (list) list.push(annotation)
else this.annotations.set(obj.spine_index, [annotation])
this.annotationsByValue.set(value, annotation)
}
}
this.view.addEventListener('create-overlay', e => {
const { index } = e.detail
const list = this.annotations.get(index)
if (list) for (const annotation of list)
this.view.addAnnotation(annotation)
})
this.view.addEventListener('draw-annotation', e => {
const { draw, annotation } = e.detail
const { color } = annotation
draw(Overlayer.highlight, { color })
})
this.view.addEventListener('show-annotation', e => {
const annotation = this.annotationsByValue.get(e.detail.value)
if (annotation.note) alert(annotation.note)
})
}
}
#handleKeydown(event) {
const k = event.key
if (k === 'ArrowLeft' || k === 'h') this.view.goLeft()
else if(k === 'ArrowRight' || k === 'l') this.view.goRight()
}
#onLoad({ detail: { doc } }) {
doc.addEventListener('keydown', this.#handleKeydown.bind(this))
}
#onRelocate({ detail }) {
const { fraction, location, tocItem, pageItem } = detail
const percent = percentFormat.format(fraction)
const loc = pageItem
? `Page ${pageItem.label}`
: `Loc ${location.current}`
const slider = $('#progress-slider')
slider.style.visibility = 'visible'
slider.value = fraction
slider.title = `${percent} · ${loc}`
if (tocItem?.href) this.#tocView?.setCurrentHref?.(tocItem.href)
}
}
const open = async file => {
document.body.removeChild($('#drop-target'))
const reader = new Reader()
globalThis.reader = reader
await reader.open(file)
}
const dragOverHandler = e => e.preventDefault()
const dropHandler = e => {
e.preventDefault()
const item = Array.from(e.dataTransfer.items)
.find(item => item.kind === 'file')
if (item) {
const entry = item.webkitGetAsEntry()
open(entry.isFile ? item.getAsFile() : entry).catch(e => console.error(e))
}
}
const dropTarget = $('#drop-target')
dropTarget.addEventListener('drop', dropHandler)
dropTarget.addEventListener('dragover', dragOverHandler)
$('#file-input').addEventListener('change', e =>
open(e.target.files[0]).catch(e => console.error(e)))
$('#file-button').addEventListener('click', () => $('#file-input').click())
const params = new URLSearchParams(location.search)
const url = params.get('url')
if (url) open(url).catch(e => console.error(e))
else dropTarget.style.visibility = 'visible'
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