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import { TimeBound, TimeBoundValue } from "../../clientUtils/TimeBounds"
import { findClosestTime, last } from "../../clientUtils/Util"
export interface TimelineManager {
disablePlay?: boolean
formatTimeFn?: (time: Time) => string
isPlaying?: boolean
userHasSetTimeline?: boolean
times: Time[]
startHandleTimeBound: TimeBound
endHandleTimeBound: TimeBound
msPerTick?: number
onPlay?: () => void
}
const delay = (ms: number): Promise<void> =>
new Promise((resolve) => setTimeout(resolve, ms))
export class TimelineController {
manager: TimelineManager
constructor(manager: TimelineManager) {
this.manager = manager
}
private get timesAsc(): number[] {
// Note: assumes times is sorted in asc
return this.manager.times
}
private get startTime(): number {
return findClosestTime(
this.timesAsc,
this.manager.startHandleTimeBound
)!
}
private get endTime(): number {
return findClosestTime(this.timesAsc, this.manager.endHandleTimeBound)!
}
get minTime(): number {
return this.timesAsc[0]
}
get maxTime(): number {
return last(this.timesAsc)!
}
get startTimeProgress(): number {
return (this.startTime - this.minTime) / (this.maxTime - this.minTime)
}
get endTimeProgress(): number {
return (this.endTime - this.minTime) / (this.maxTime - this.minTime)
}
getNextTime(time: number): number {
// Todo: speed up?
return this.timesAsc[this.timesAsc.indexOf(time) + 1] ?? this.maxTime
}
// By default, play means extend the endTime to the right. Toggle this to play one time unit at a time.
private rangeMode = true
toggleRangeMode(): this {
this.rangeMode = !this.rangeMode
return this
}
private isAtEnd(): boolean {
return this.endTime === this.maxTime
}
private resetToBeginning(): void {
const { manager } = this
const beginning =
manager.endHandleTimeBound !== manager.startHandleTimeBound
? manager.startHandleTimeBound
: this.minTime
manager.endHandleTimeBound = beginning
manager.startHandleTimeBound = beginning
}
async play(numberOfTicks?: number): Promise<number> {
const { manager } = this
manager.isPlaying = true
if (this.isAtEnd()) this.resetToBeginning()
if (manager.onPlay) manager.onPlay()
// Keep and return a tickCount for easier testability
let tickCount = 0
while (manager.isPlaying) {
const nextTime = this.getNextTime(this.endTime)
if (!this.rangeMode) this.updateStartTime(nextTime)
this.updateEndTime(nextTime)
tickCount++
if (nextTime >= this.maxTime || numberOfTicks === tickCount) {
this.stop()
break
}
await delay(manager.msPerTick ?? 0)
}
return tickCount
}
private stop(): void {
this.manager.isPlaying = false
}
private pause(): void {
this.manager.isPlaying = false
}
async togglePlay(): Promise<void> {
if (this.manager.isPlaying) this.pause()
else await this.play()
}
private dragOffsets: [number, number] = [0, 0]
setDragOffsets(inputTime: number): void {
const closestTime =
findClosestTime(this.timesAsc, inputTime) ?? inputTime
this.dragOffsets = [
this.startTime - closestTime,
this.endTime - closestTime,
]
}
getTimeBoundFromDrag(inputTime: Time): TimeBound {
if (inputTime < this.minTime) return TimeBoundValue.negativeInfinity
if (inputTime > this.maxTime) return TimeBoundValue.positiveInfinity
const closestTime =
findClosestTime(this.timesAsc, inputTime) ?? inputTime
return Math.min(this.maxTime, Math.max(this.minTime, closestTime))
}
private dragRangeToTime(time: Time): void {
const { minTime, maxTime } = this
const closestTime = findClosestTime(this.timesAsc, time) ?? time
let startTime = this.dragOffsets[0] + closestTime
let endTime = this.dragOffsets[1] + closestTime
if (startTime < minTime) {
startTime = minTime
endTime = this.getTimeBoundFromDrag(
minTime + (this.dragOffsets[1] - this.dragOffsets[0])
)
} else if (endTime > maxTime) {
startTime = this.getTimeBoundFromDrag(
maxTime + (this.dragOffsets[0] - this.dragOffsets[1])
)
endTime = maxTime
}
this.updateStartTime(startTime)
this.updateEndTime(endTime)
}
dragHandleToTime(
handle: "start" | "end" | "both",
inputTime: number
): "start" | "end" | "both" {
const { manager } = this
const time = this.getTimeBoundFromDrag(inputTime)
const constrainedHandle =
handle === "start" && time > this.endTime
? "end"
: handle === "end" && time < this.startTime
? "start"
: handle
if (constrainedHandle !== handle) {
if (handle === "start")
this.updateStartTime(manager.endHandleTimeBound)
else this.updateEndTime(manager.startHandleTimeBound)
}
if (manager.isPlaying && !this.rangeMode) {
this.updateStartTime(time)
this.updateEndTime(time)
} else if (handle === "both") this.dragRangeToTime(inputTime)
else if (constrainedHandle === "start") this.updateStartTime(time)
else if (constrainedHandle === "end") this.updateEndTime(time)
return constrainedHandle
}
private updateStartTime(timeBound: TimeBound): void {
this.manager.startHandleTimeBound = timeBound
}
private updateEndTime(timeBound: TimeBound): void {
this.manager.endHandleTimeBound = timeBound
}
resetStartToMin(): void {
this.updateStartTime(TimeBoundValue.negativeInfinity)
}
resetEndToMax(): void {
this.updateEndTime(TimeBoundValue.positiveInfinity)
}
}
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