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48x 48x 29x 33x 48x 48x 35x 70x 33x 262x 262x 262x 33x 33x 35x 35x 35x 35x 34x 34x 35x 107x 107x 35x 35x 35x 35x 35x 35x 35x 35x 35x 32x 32x 32x 33x 435x 435x 435x 435x 435x 435x 435x 2610x 435x 33x 146x 6x 3x 3x 1x 2x 1x 3x 33x | import { invariant } from "hey-listen" import { PanSession, AnyPointerEvent, PanInfo } from "../../gestures/PanSession" import { ResolvedConstraints } from "./types" import { Lock, getGlobalLock } from "./utils/lock" import { isRefObject } from "../../utils/is-ref-object" import { addPointerEvent } from "../../events/use-pointer-event" import { calcRelativeConstraints, calcViewportConstraints, applyConstraints, rebaseAxisConstraints, resolveDragElastic, defaultElastic, calcOrigin, } from "./utils/constraints" import { AnimationType } from "../../render/utils/types" import { VisualElement } from "../../render/types" import { MotionProps } from "../../motion/types" import { Point } from "../../projection/geometry/types" import { createBox } from "../../projection/geometry/models" import { eachAxis } from "../../projection/utils/each-axis" import { measurePageBox } from "../../projection/utils/measure" import { extractEventInfo } from "../../events/event-info" import { Transition } from "../../types" import { startAnimation } from "../../animation/utils/transitions" import { convertBoundingBoxToBox, convertBoxToBoundingBox, } from "../../projection/geometry/conversion" import { LayoutUpdateData } from "../../projection/node/types" import { addDomEvent } from "../../events/use-dom-event" import { mix } from "popmotion" import { percent } from "style-value-types" import { calcLength } from "../../projection/geometry/delta-calc" export const elementDragControls = new WeakMap< VisualElement, VisualElementDragControls >() export interface DragControlOptions { snapToCursor?: boolean cursorProgress?: Point } type DragDirection = "x" | "y" /** * */ // let latestPointerEvent: AnyPointerEvent export class VisualElementDragControls { private visualElement: VisualElement private panSession?: PanSession // This is a reference to the global drag gesture lock, ensuring only one component // can "capture" the drag of one or both axes. // TODO: Look into moving this into pansession? private openGlobalLock: Lock | null = null isDragging = false private currentDirection: DragDirection | null = null private originPoint: Point = { x: 0, y: 0 } /** * The permitted boundaries of travel, in pixels. */ private constraints: ResolvedConstraints | false = false private hasMutatedConstraints = false /** * The per-axis resolved elastic values. */ private elastic = createBox() constructor(visualElement: VisualElement) { this.visualElement = visualElement } start( originEvent: AnyPointerEvent, { snapToCursor = false }: DragControlOptions = {} ) { /** * Don't start dragging if this component is exiting */ Iif (this.visualElement.isPresent === false) return const onSessionStart = (event: AnyPointerEvent) => { // Stop any animations on both axis values immediately. This allows the user to throw and catch // the component. this.stopAnimation() Iif (snapToCursor) { this.snapToCursor(extractEventInfo(event, "page").point) } } const onStart = (event: AnyPointerEvent, info: PanInfo) => { // Attempt to grab the global drag gesture lock - maybe make this part of PanSession const { drag, dragPropagation, onDragStart } = this.getProps() if (drag && !dragPropagation) { Iif (this.openGlobalLock) this.openGlobalLock() this.openGlobalLock = getGlobalLock(drag) // If we don 't have the lock, don't start dragging if (!this.openGlobalLock) return } this.isDragging = true this.currentDirection = null this.resolveConstraints() Eif (this.visualElement.projection) { this.visualElement.projection.isAnimationBlocked = true this.visualElement.projection.target = undefined } /** * Record gesture origin */ eachAxis((axis) => { let current = this.getAxisMotionValue(axis).get() || 0 /** * If the MotionValue is a percentage value convert to px */ Iif (percent.test(current)) { const measuredAxis = this.visualElement.projection?.layout?.actual[axis] if (measuredAxis) { const length = calcLength(measuredAxis) current = length * (parseFloat(current) / 100) } } this.originPoint[axis] = current }) // Fire onDragStart event onDragStart?.(event, info) this.visualElement.animationState?.setActive( AnimationType.Drag, true ) } const onMove = (event: AnyPointerEvent, info: PanInfo) => { // latestPointerEvent = event const { dragPropagation, dragDirectionLock, onDirectionLock, onDrag, } = this.getProps() // If we didn't successfully receive the gesture lock, early return. if (!dragPropagation && !this.openGlobalLock) return const { offset } = info // Attempt to detect drag direction if directionLock is true if (dragDirectionLock && this.currentDirection === null) { this.currentDirection = getCurrentDirection(offset) // If we've successfully set a direction, notify listener if (this.currentDirection !== null) { onDirectionLock?.(this.currentDirection) } return } // Update each point with the latest position this.updateAxis("x", info.point, offset) this.updateAxis("y", info.point, offset) /** * Ideally we would leave the renderer to fire naturally at the end of * this frame but if the element is about to change layout as the result * of a re-render we want to ensure the browser can read the latest * bounding box to ensure the pointer and element don't fall out of sync. */ this.visualElement.syncRender() /** * This must fire after the syncRender call as it might trigger a state * change which itself might trigger a layout update. */ onDrag?.(event, info) } const onSessionEnd = (event: AnyPointerEvent, info: PanInfo) => this.stop(event, info) this.panSession = new PanSession( originEvent, { onSessionStart, onStart, onMove, onSessionEnd, }, { transformPagePoint: this.visualElement.getTransformPagePoint() } ) } private stop(event: AnyPointerEvent, info: PanInfo) { const isDragging = this.isDragging this.cancel() if (!isDragging) return const { velocity } = info this.startAnimation(velocity) const { onDragEnd } = this.getProps() onDragEnd?.(event, info) } private cancel() { this.isDragging = false Eif (this.visualElement.projection) { this.visualElement.projection.isAnimationBlocked = false } this.panSession?.end() this.panSession = undefined const { dragPropagation } = this.getProps() if (!dragPropagation && this.openGlobalLock) { this.openGlobalLock() this.openGlobalLock = null } this.visualElement.animationState?.setActive(AnimationType.Drag, false) } private updateAxis(axis: DragDirection, _point: Point, offset?: Point) { const { drag } = this.getProps() // If we're not dragging this axis, do an early return. if (!offset || !shouldDrag(axis, drag, this.currentDirection)) return const axisValue = this.getAxisMotionValue(axis) let next = this.originPoint[axis] + offset[axis] // Apply constraints if (this.constraints && this.constraints[axis]) { next = applyConstraints( next, this.constraints[axis], this.elastic[axis] ) } axisValue.set(next) } private resolveConstraints() { const { dragConstraints, dragElastic } = this.getProps() const { layout } = this.visualElement.projection || {} const prevConstraints = this.constraints Iif (dragConstraints && isRefObject(dragConstraints)) { if (!this.constraints) { this.constraints = this.resolveRefConstraints() } } else { if (dragConstraints && layout) { this.constraints = calcRelativeConstraints( layout.actual, dragConstraints ) } else { this.constraints = false } } this.elastic = resolveDragElastic(dragElastic) /** * If we're outputting to external MotionValues, we want to rebase the measured constraints * from viewport-relative to component-relative. */ if ( prevConstraints !== this.constraints && layout && this.constraints && !this.hasMutatedConstraints ) { eachAxis((axis) => { Eif (this.getAxisMotionValue(axis)) { this.constraints[axis] = rebaseAxisConstraints( layout.actual[axis], this.constraints[axis] ) } }) } } private resolveRefConstraints() { const { dragConstraints: constraints, onMeasureDragConstraints } = this.getProps() if (!constraints || !isRefObject(constraints)) return false const constraintsElement = constraints.current as HTMLElement invariant( constraintsElement !== null, "If `dragConstraints` is set as a React ref, that ref must be passed to another component's `ref` prop." ) const { projection } = this.visualElement // TODO if (!projection || !projection.layout) return false const constraintsBox = measurePageBox( constraintsElement, projection.root!, this.visualElement.getTransformPagePoint() ) let measuredConstraints = calcViewportConstraints( projection.layout.actual, constraintsBox ) /** * If there's an onMeasureDragConstraints listener we call it and * if different constraints are returned, set constraints to that */ if (onMeasureDragConstraints) { const userConstraints = onMeasureDragConstraints( convertBoxToBoundingBox(measuredConstraints) ) this.hasMutatedConstraints = !!userConstraints if (userConstraints) { measuredConstraints = convertBoundingBoxToBox(userConstraints) } } return measuredConstraints } private startAnimation(velocity: Point) { const { drag, dragMomentum, dragElastic, dragTransition, dragSnapToOrigin, onDragTransitionEnd, } = this.getProps() const constraints = this.constraints || {} const momentumAnimations = eachAxis((axis) => { if (!shouldDrag(axis, drag, this.currentDirection)) { return } let transition = constraints?.[axis] ?? {} Iif (dragSnapToOrigin) transition = { min: 0, max: 0 } /** * Overdamp the boundary spring if `dragElastic` is disabled. There's still a frame * of spring animations so we should look into adding a disable spring option to `inertia`. * We could do something here where we affect the `bounceStiffness` and `bounceDamping` * using the value of `dragElastic`. */ const bounceStiffness = dragElastic ? 200 : 1000000 const bounceDamping = dragElastic ? 40 : 10000000 const inertia = { type: "inertia", velocity: dragMomentum ? velocity[axis] : 0, bounceStiffness, bounceDamping, timeConstant: 750, restDelta: 1, restSpeed: 10, ...dragTransition, ...transition, } // If we're not animating on an externally-provided `MotionValue` we can use the // component's animation controls which will handle interactions with whileHover (etc), // otherwise we just have to animate the `MotionValue` itself. return this.startAxisValueAnimation(axis, inertia) }) // Run all animations and then resolve the new drag constraints. return Promise.all(momentumAnimations).then(onDragTransitionEnd) } private startAxisValueAnimation( axis: DragDirection, transition: Transition ) { const axisValue = this.getAxisMotionValue(axis) return startAnimation(axis, axisValue, 0, transition) } private stopAnimation() { eachAxis((axis) => this.getAxisMotionValue(axis).stop()) } /** * Drag works differently depending on which props are provided. * * - If _dragX and _dragY are provided, we output the gesture delta directly to those motion values. * - Otherwise, we apply the delta to the x/y motion values. */ private getAxisMotionValue(axis: DragDirection) { const dragKey = "_drag" + axis.toUpperCase() const externalMotionValue = this.visualElement.getProps()[dragKey] return externalMotionValue ? externalMotionValue : this.visualElement.getValue( axis, this.visualElement.getProps().initial?.[axis] ?? 0 ) } private snapToCursor(point: Point) { eachAxis((axis) => { const { drag } = this.getProps() // If we're not dragging this axis, do an early return. if (!shouldDrag(axis, drag, this.currentDirection)) return const { projection } = this.visualElement const axisValue = this.getAxisMotionValue(axis) if (projection && projection.layout) { const { min, max } = projection.layout.actual[axis] axisValue.set(point[axis] - mix(min, max, 0.5)) } }) } /** * When the viewport resizes we want to check if the measured constraints * have changed and, if so, reposition the element within those new constraints * relative to where it was before the resize. */ scalePositionWithinConstraints() { const { drag, dragConstraints } = this.getProps() const { projection } = this.visualElement if (!isRefObject(dragConstraints) || !projection || !this.constraints) return /** * Stop current animations as there can be visual glitching if we try to do * this mid-animation */ this.stopAnimation() /** * Record the relative position of the dragged element relative to the * constraints box and save as a progress value. */ const boxProgress = { x: 0, y: 0 } eachAxis((axis) => { const axisValue = this.getAxisMotionValue(axis) if (axisValue) { const latest = axisValue.get() boxProgress[axis] = calcOrigin( { min: latest, max: latest }, this.constraints[axis] ) } }) /** * Update the layout of this element and resolve the latest drag constraints */ const { transformTemplate } = this.visualElement.getProps() this.visualElement.getInstance().style.transform = transformTemplate ? transformTemplate({}, "") : "none" projection.root?.updateScroll() projection.updateLayout() this.resolveConstraints() /** * For each axis, calculate the current progress of the layout axis * within the new constraints. */ eachAxis((axis) => { if (!shouldDrag(axis, drag, null)) return /** * Calculate a new transform based on the previous box progress */ const axisValue = this.getAxisMotionValue(axis) const { min, max } = this.constraints[axis] axisValue.set(mix(min, max, boxProgress[axis])) }) } addListeners() { elementDragControls.set(this.visualElement, this) const element = this.visualElement.getInstance() /** * Attach a pointerdown event listener on this DOM element to initiate drag tracking. */ const stopPointerListener = addPointerEvent( element, "pointerdown", (event) => { const { drag, dragListener = true } = this.getProps() drag && dragListener && this.start(event) } ) const measureDragConstraints = () => { const { dragConstraints } = this.getProps() Iif (isRefObject(dragConstraints)) { this.constraints = this.resolveRefConstraints() } } const { projection } = this.visualElement const stopMeasureLayoutListener = projection!.addEventListener( "measure", measureDragConstraints ) Eif (projection && !projection!.layout) { projection.root?.updateScroll() projection.updateLayout() } measureDragConstraints() /** * Attach a window resize listener to scale the draggable target within its defined * constraints as the window resizes. */ const stopResizeListener = addDomEvent(window, "resize", () => { this.scalePositionWithinConstraints() }) /** * If the element's layout changes, calculate the delta and apply that to * the drag gesture's origin point. */ projection!.addEventListener("didUpdate", (({ delta, hasLayoutChanged, }: LayoutUpdateData) => { if (this.isDragging && hasLayoutChanged) { eachAxis((axis) => { const motionValue = this.getAxisMotionValue(axis) if (!motionValue) return this.originPoint[axis] += delta[axis].translate motionValue.set(motionValue.get() + delta[axis].translate) }) this.visualElement.syncRender() } }) as any) return () => { stopResizeListener() stopPointerListener() stopMeasureLayoutListener() } } getProps(): MotionProps { const props = this.visualElement.getProps() const { drag = false, dragDirectionLock = false, dragPropagation = false, dragConstraints = false, dragElastic = defaultElastic, dragMomentum = true, } = props return { ...props, drag, dragDirectionLock, dragPropagation, dragConstraints, dragElastic, dragMomentum, } } } function shouldDrag( direction: DragDirection, drag: boolean | DragDirection | undefined, currentDirection: null | DragDirection ) { return ( (drag === true || drag === direction) && (currentDirection === null || currentDirection === direction) ) } /** * Based on an x/y offset determine the current drag direction. If both axis' offsets are lower * than the provided threshold, return `null`. * * @param offset - The x/y offset from origin. * @param lockThreshold - (Optional) - the minimum absolute offset before we can determine a drag direction. */ function getCurrentDirection( offset: Point, ElockThreshold = 10 ): DragDirection | null { let direction: DragDirection | null = null if (Math.abs(offset.y) > lockThreshold) { direction = "y" } else if (Math.abs(offset.x) > lockThreshold) { direction = "x" } return direction } export function expectsResolvedDragConstraints({ dragConstraints, onMeasureDragConstraints, }: MotionProps) { return isRefObject(dragConstraints) && !!onMeasureDragConstraints } |