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import React, { Component } from 'react'
import { connect } from 'react-redux'
import actions from 'app/actions'
import { toArray, floatInRange } from 'app/utils'
import oktween from 'app/utils/oktween'
import ParagraphList from 'app/views/editor/paragraph/components/paragraph.list'
import { transcriptElementLookup } from './components'
class Transcript extends Component {
state = {
built: false,
paragraphs: [],
windowHeight: 0.0,
autoscrolling: false,
}
constructor(props){
super(props)
this.handleClose = this.handleClose.bind(this)
this.handleAnnotationClick = this.handleAnnotationClick.bind(this)
this.handleParagraphDoubleClick = this.handleParagraphDoubleClick.bind(this)
this.handleMouseWheel = this.handleMouseWheel.bind(this)
this.containerRef = React.createRef()
this.lastScroll = 0
}
componentDidMount() {
actions.transcript.buildAllParagraphs()
this.setState({
built: true,
windowHeight: window.innerHeight * 0.6 - 48,
})
}
componentDidUpdate(prevProps, prevState) {
if (this.state.built !== prevState.built) {
setTimeout(() => {
this.cacheScrollPositions()
}, 1000)
}
if (!this.state.autoscrolling) {
if (this.props.viewer.currentSection !== prevProps.viewer.currentSection) {
this.updateScrollPosition(this.props.viewer.currentSection.start_ts, true)
} else {
this.updateScrollPosition(this.props.play_ts, false)
}
}
}
cacheScrollPositions() {
let paragraphs = toArray(this.containerRef.current.querySelectorAll('.content > div')).map(el => {
const isHeading = el.classList.contains('section_heading')
const isMedia = el.dataset.media === 'true'
const scrollTop = isHeading ? el.offsetTop : el.offsetTop - 16 // 1.5rem
const start_ts = parseFloat(el.dataset.startts)
let end_ts = parseFloat(el.dataset.endts)
if (!start_ts || !end_ts) return null
if (end_ts < start_ts) {
end_ts = start_ts + 0.5
}
return { start_ts, end_ts, scrollTop }
}).filter(el => !!el)
this.setState({ paragraphs })
}
updateScrollPosition(play_ts, forceScroll) {
if (this.state.autoscrolling) return
const { paragraphs, windowHeight, currentParagraph } = this.state
const scrollTop = this.containerRef.current.scrollTop
const now = Date.now()
if (!forceScroll && currentParagraph && floatInRange(currentParagraph.start_ts, play_ts, currentParagraph.end_ts)) {
return
}
let nextParagraph;
const insideParagraph = paragraphs.some(paragraph => {
if (floatInRange(paragraph.start_ts, play_ts, paragraph.end_ts)) {
nextParagraph = paragraph
return true
}
return false
})
// the paragraph updated!
if (insideParagraph && nextParagraph) {
// first check if we need to scroll.
// if we're not being forced and the next paragraph is in view, dont scroll
if (!forceScroll && floatInRange(scrollTop, nextParagraph.scrollTop, scrollTop + windowHeight)) {
this.setState({ currentParagraph: nextParagraph })
return
}
// ok, so we wanna scroll.
// is the transcript closed? then we can scroll immediately!
if (!this.props.viewer.transcript) {
this.setState({ currentParagraph: nextParagraph })
this.scrollImmediate(nextParagraph.scrollTop)
return
}
// console.log(nextParagraph.scrollTop)
// if the last scroll event was within a second ago, suppress auto-scroll to avoid it bouncing around
if ((now - this.lastScroll) < 1200) {
this.setState({ currentParagraph: nextParagraph })
return
}
// before i was checking this criteria.. if the distance we wanna scroll is less than a window height
// Math.abs(scrollTop - nextParagraph.scrollTop) < this.state.windowHeight
this.lastScroll = now
this.scrollToParagraph(scrollTop, nextParagraph.scrollTop)
this.setState({ currentParagraph: nextParagraph, autoscrolling: true })
}
}
scrollToParagraph(scrollFrom, scrollTo) {
// suppress if already scrolling
if (this.state.autoscrolling) return
// console.log('autoscrolling!', scrollFrom, scrollTo)
oktween.add({
from: { scrollTop: scrollFrom },
to: { scrollTop: scrollTo },
duration: 1000,
easing: oktween.easing.quad_in_out,
update: obj => {
this.scrollImmediate(obj.scrollTop)
this.containerRef.current.scrollTo(0, obj.scrollTop)
},
finished: tween => {
this.scrollImmediate(tween.obj.scrollTop)
this.setState({ autoscrolling: false })
}
})
}
scrollImmediate(pos) {
this.containerRef.current.scrollTo(0, pos)
}
handleAnnotationClick(e, paragraph, annotation) {
if (annotation.type === 'footnote') {
return actions.viewer.openFootnote(annotation)
}
actions.viewer.seekToTimestamp(annotation.start_ts)
this.updateScrollPosition(annotation.start_ts + 0.1, annotation.type === 'section_heading')
}
handleParagraphDoubleClick(e, paragraph) {
return
}
handleClose() {
actions.viewer.hideComponent('transcript')
}
handleMouseWheel(e) {
e.stopPropagation()
this.lastScroll = Date.now()
}
render() {
const { viewer, paragraphs } = this.props
// console.log(paragraphs.map(p => p.annotations.filter(a => a.type === 'footnote')).filter(p => p.length))
return (
<div className="transcript">
<div
className='content'
ref={this.containerRef}
onWheel={this.handleMouseWheel}
>
<ParagraphList
paragraphs={paragraphs}
paragraphElementLookup={transcriptElementLookup}
onAnnotationClick={this.handleAnnotationClick}
onParagraphDoubleClick={this.handleParagraphDoubleClick}
/>
</div>
<div
className='close'
onClick={this.handleClose}
/>
</div>
)
}
}
/*
<a className='footer' href='#'>
Download PDF
</a>
*/
const mapStateToProps = state => ({
viewer: state.viewer,
play_ts: state.audio.play_ts,
paragraphs: state.paragraph.paragraphs,
})
export default connect(mapStateToProps)(Transcript)
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