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import { h, Component } from 'preact'
import { clamp, norm } from '../util/math'
const initialState = {
dir: '/',
start: null,
end: null,
cursor: null,
selection: null,
width: 0,
ratio: 0,
loading: true
}
export default class Timeline extends Component {
state = { ...initialState }
constructor() {
super()
this.handleMouseDown = this.handleMouseDown.bind(this)
this.handleMouseMove = this.handleMouseMove.bind(this)
this.handleMouseUp = this.handleMouseUp.bind(this)
this.computeOffset = this.computeOffset.bind(this)
}
componentDidMount() {
const { sequence } = this.props
window.addEventListener('resize', this.computeOffset)
window.addEventListener('mousemove', this.handleMouseMove)
window.addEventListener('mouseup', this.handleMouseUp)
this.computeOffset()
if (sequence) {
this.reset()
}
}
componentDidUpdate(prevProps) {
const { sequence } = this.props
if (sequence !== prevProps.sequence) {
this.reset()
}
}
componentWillUnmount(){
window.removeEventListener('resize', this.computeOffset)
window.removeEventListener('mousemove', this.handleMouseMove)
window.removeEventListener('mouseup', this.handleMouseUp)
}
reset(){
const { sequence } = this.props
if (!sequence || !sequence.length) return
const len = sequence.length - 1
const start = { frame: sequence[0], i: 0 }
const end = { frame: sequence[len], i: len }
const width = Math.sqrt(clamp(sequence.length / 15000, 0.2, 1.0)) * Math.min(window.innerWidth - 40, 1000)
const ratio = width / sequence.length
setTimeout(() => this.computeOffset())
this.setState({
...initialState,
width,
ratio,
start,
end,
})
}
computeOffset(){
if (this.ref) {
this.offset = this.ref.getBoundingClientRect()
}
}
computeFrame(e){
const { sequence } = this.props
if (!sequence || !sequence.length) return null
let x = (e.pageX - this.offset.left) / this.offset.width
let y = (e.pageY - this.offset.top) / this.offset.height
if (this.state.dragging) {
x = clamp(x, 0, 1)
y = clamp(y, 0, 1)
}
if (0 <= x && x <= 1 && 0 <= y && y <= 1) {
const index = Math.floor(x * (sequence.length-1))
return { frame: sequence[index], i: index }
}
return null
}
handleMouseDown(e) {
this.setState({ dragging: true })
const frame = this.computeFrame(e)
if (frame) {
this.props.onPick && this.props.onPick(frame)
this.props.onSelect && this.props.onSelect({ start: frame, end: frame })
this.setState({
start: frame,
end: frame,
})
}
}
handleMouseMove(e) {
const frame = this.computeFrame(e)
if (frame) {
this.props.onCursor && this.props.onCursor(frame)
if (this.state.dragging) {
let start = this.state.start
let end = frame
this.setState({
cursor: frame,
end: frame,
})
if (this.props.onSelect) {
if (end.i < start.i) {
[start, end] = [end, start]
}
this.props.onSelect({ start, end })
}
} else {
this.setState({
cursor: frame
})
}
}
}
handleMouseUp(e) {
if (!this.state.dragging) return
let { start, end } = this.state
if (end.i < start.i) {
[start, end] = [end, start]
}
this.props.onSelect && this.props.onSelect({ start, end })
this.setState({ dragging: false })
}
render() {
const { sequence } = this.props
const { loading, start, end, cursor, width, ratio } = this.state
return (
<div
className='timeline'
style={{ width }}
ref={ref => this.ref = ref}
onMouseDown={this.handleMouseDown}
>
{ratio && start && end && this.renderSelection(start, end, ratio)}
{ratio && cursor && this.renderCursor(cursor, ratio)}
</div>
)
}
renderCursor(cursor, ratio){
const left = cursor.i * ratio
return (
<div key='cursor' className='cursor' style={{ left }} />
)
}
renderSelection(start, end, ratio){
const left = Math.min(start.i, end.i) * ratio
const width = Math.max(Math.abs(start.i - end.i) * ratio, 1)
return (
<div key='selection' className='selection' style={{ left, width }} />
)
}
}
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