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278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 | 33x 33x 33x 33x 33x 33x 33x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 72x 72x 72x 72x 72x 58x 58x 58x 58x 58x 34x 34x 58x 38x 66x 66x 66x 66x 38x 37x 37x 37x 37x 2x 37x 33x 1x 33x 71x 71x 33x 141x 290x 145x 145x 145x 203x 145x 87x 58x 58x 58x 58x 152x 152x 7x 145x 58x 58x 58x 58x 58x 58x 58x | import { EventInfo } from "../events/types" import { isTouchEvent, isMouseEvent } from "./utils/event-type" import { extractEventInfo } from "../events/event-info" import sync, { getFrameData, cancelSync } from "framesync" import { secondsToMilliseconds } from "../utils/time-conversion" import { addPointerEvent } from "../events/use-pointer-event" import { distance, pipe } from "popmotion" import { Point, TransformPoint } from "../projection/geometry/types" export type AnyPointerEvent = MouseEvent | TouchEvent | PointerEvent /** * Passed in to pan event handlers like `onPan` the `PanInfo` object contains * information about the current state of the tap gesture such as its * `point`, `delta`, `offset` and `velocity`. * * ```jsx * <motion.div onPan={(event, info) => { * console.log(info.point.x, info.point.y) * }} /> * ``` * * @public */ export interface PanInfo { /** * Contains `x` and `y` values for the current pan position relative * to the device or page. * * ```jsx * function onPan(event, info) { * console.log(info.point.x, info.point.y) * } * * <motion.div onPan={onPan} /> * ``` * * @public */ point: Point /** * Contains `x` and `y` values for the distance moved since * the last event. * * ```jsx * function onPan(event, info) { * console.log(info.delta.x, info.delta.y) * } * * <motion.div onPan={onPan} /> * ``` * * @public */ delta: Point /** * Contains `x` and `y` values for the distance moved from * the first pan event. * * ```jsx * function onPan(event, info) { * console.log(info.offset.x, info.offset.y) * } * * <motion.div onPan={onPan} /> * ``` * * @public */ offset: Point /** * Contains `x` and `y` values for the current velocity of the pointer, in px/ms. * * ```jsx * function onPan(event, info) { * console.log(info.velocity.x, info.velocity.y) * } * * <motion.div onPan={onPan} /> * ``` * * @public */ velocity: Point } export type PanHandler = (event: Event, info: PanInfo) => void interface PanSessionHandlers { onSessionStart: PanHandler onStart: PanHandler onMove: PanHandler onEnd: PanHandler onSessionEnd: PanHandler } interface PanSessionOptions { transformPagePoint?: TransformPoint } interface TimestampedPoint extends Point { timestamp: number } /** * @internal */ export class PanSession { /** * @internal */ private history: TimestampedPoint[] /** * @internal */ private startEvent: AnyPointerEvent | null = null /** * @internal */ private lastMoveEvent: AnyPointerEvent | null = null /** * @internal */ private lastMoveEventInfo: EventInfo | null = null /** * @internal */ private transformPagePoint?: TransformPoint /** * @internal */ private handlers: Partial<PanSessionHandlers> = {} /** * @internal */ private removeListeners: Function constructor( event: AnyPointerEvent, handlers: Partial<PanSessionHandlers>, { transformPagePoint }: PanSessionOptions = {} ) { // If we have more than one touch, don't start detecting this gesture Iif (isTouchEvent(event) && event.touches.length > 1) return this.handlers = handlers this.transformPagePoint = transformPagePoint const info = extractEventInfo(event) const initialInfo = transformPoint(info, this.transformPagePoint) const { point } = initialInfo const { timestamp } = getFrameData() this.history = [{ ...point, timestamp }] const { onSessionStart } = handlers onSessionStart && onSessionStart(event, getPanInfo(initialInfo, this.history)) this.removeListeners = pipe( addPointerEvent(window, "pointermove", this.handlePointerMove), addPointerEvent(window, "pointerup", this.handlePointerUp), addPointerEvent(window, "pointercancel", this.handlePointerUp) ) } private updatePoint = () => { Iif (!(this.lastMoveEvent && this.lastMoveEventInfo)) return const info = getPanInfo(this.lastMoveEventInfo, this.history) const isPanStarted = this.startEvent !== null // Only start panning if the offset is larger than 3 pixels. If we make it // any larger than this we'll want to reset the pointer history // on the first update to avoid visual snapping to the cursoe. const isDistancePastThreshold = distance(info.offset, { x: 0, y: 0 }) >= 3 if (!isPanStarted && !isDistancePastThreshold) return const { point } = info const { timestamp } = getFrameData() this.history.push({ ...point, timestamp }) const { onStart, onMove } = this.handlers if (!isPanStarted) { onStart && onStart(this.lastMoveEvent, info) this.startEvent = this.lastMoveEvent } onMove && onMove(this.lastMoveEvent, info) } private handlePointerMove = (event: AnyPointerEvent, info: EventInfo) => { this.lastMoveEvent = event this.lastMoveEventInfo = transformPoint(info, this.transformPagePoint) // Because Safari doesn't trigger mouseup events when it's above a `<select>` Iif (isMouseEvent(event) && event.buttons === 0) { this.handlePointerUp(event, info) return } // Throttle mouse move event to once per frame sync.update(this.updatePoint, true) } private handlePointerUp = (event: AnyPointerEvent, info: EventInfo) => { this.end() const { onEnd, onSessionEnd } = this.handlers const panInfo = getPanInfo( transformPoint(info, this.transformPagePoint), this.history ) if (this.startEvent && onEnd) { onEnd(event, panInfo) } onSessionEnd && onSessionEnd(event, panInfo) } updateHandlers(handlers: Partial<PanSessionHandlers>) { this.handlers = handlers } end() { this.removeListeners && this.removeListeners() cancelSync.update(this.updatePoint) } } function transformPoint( info: EventInfo, transformPagePoint?: (point: Point) => Point ) { return transformPagePoint ? { point: transformPagePoint(info.point) } : info } function subtractPoint(a: Point, b: Point): Point { return { x: a.x - b.x, y: a.y - b.y } } function getPanInfo({ point }: EventInfo, history: TimestampedPoint[]) { return { point, delta: subtractPoint(point, lastDevicePoint(history)), offset: subtractPoint(point, startDevicePoint(history)), velocity: getVelocity(history, 0.1), } } function startDevicePoint(history: TimestampedPoint[]): TimestampedPoint { return history[0] } function lastDevicePoint(history: TimestampedPoint[]): TimestampedPoint { return history[history.length - 1] } function getVelocity(history: TimestampedPoint[], timeDelta: number): Point { if (history.length < 2) { return { x: 0, y: 0 } } let i = history.length - 1 let timestampedPoint: TimestampedPoint | null = null const lastPoint = lastDevicePoint(history) while (i >= 0) { timestampedPoint = history[i] if ( lastPoint.timestamp - timestampedPoint.timestamp > secondsToMilliseconds(timeDelta) ) { break } i-- } Iif (!timestampedPoint) { return { x: 0, y: 0 } } const time = (lastPoint.timestamp - timestampedPoint.timestamp) / 1000 Iif (time === 0) { return { x: 0, y: 0 } } const currentVelocity = { x: (lastPoint.x - timestampedPoint.x) / time, y: (lastPoint.y - timestampedPoint.y) / time, } Iif (currentVelocity.x === Infinity) { currentVelocity.x = 0 } Iif (currentVelocity.y === Infinity) { currentVelocity.y = 0 } return currentVelocity } |