framer-motion
Version:
A simple and powerful JavaScript animation library
445 lines (416 loc) • 17.2 kB
JavaScript
'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
var motionDom = require('motion-dom');
var motionUtils = require('motion-utils');
const wrap = (min, max, v) => {
const rangeSize = max - min;
return ((((v - min) % rangeSize) + rangeSize) % rangeSize) + min;
};
const isEasingArray = (ease) => {
return Array.isArray(ease) && typeof ease[0] !== "number";
};
function getEasingForSegment(easing, i) {
return isEasingArray(easing) ? easing[wrap(0, easing.length, i)] : easing;
}
/*
Value in range from progress
Given a lower limit and an upper limit, we return the value within
that range as expressed by progress (usually a number from 0 to 1)
So progress = 0.5 would change
from -------- to
to
from ---- to
E.g. from = 10, to = 20, progress = 0.5 => 15
@param [number]: Lower limit of range
@param [number]: Upper limit of range
@param [number]: The progress between lower and upper limits expressed 0-1
@return [number]: Value as calculated from progress within range (not limited within range)
*/
const mixNumber = (from, to, progress) => {
return from + (to - from) * progress;
};
function fillOffset(offset, remaining) {
const min = offset[offset.length - 1];
for (let i = 1; i <= remaining; i++) {
const offsetProgress = motionUtils.progress(0, remaining, i);
offset.push(mixNumber(min, 1, offsetProgress));
}
}
function defaultOffset(arr) {
const offset = [0];
fillOffset(offset, arr.length - 1);
return offset;
}
const isMotionValue = (value) => Boolean(value && value.getVelocity);
function isDOMKeyframes(keyframes) {
return typeof keyframes === "object" && !Array.isArray(keyframes);
}
function resolveSubjects(subject, keyframes, scope, selectorCache) {
if (typeof subject === "string" && isDOMKeyframes(keyframes)) {
return motionDom.resolveElements(subject, scope, selectorCache);
}
else if (subject instanceof NodeList) {
return Array.from(subject);
}
else if (Array.isArray(subject)) {
return subject;
}
else {
return [subject];
}
}
function calculateRepeatDuration(duration, repeat, _repeatDelay) {
return duration * (repeat + 1);
}
/**
* Given a absolute or relative time definition and current/prev time state of the sequence,
* calculate an absolute time for the next keyframes.
*/
function calcNextTime(current, next, prev, labels) {
if (typeof next === "number") {
return next;
}
else if (next.startsWith("-") || next.startsWith("+")) {
return Math.max(0, current + parseFloat(next));
}
else if (next === "<") {
return prev;
}
else {
return labels.get(next) ?? current;
}
}
function eraseKeyframes(sequence, startTime, endTime) {
for (let i = 0; i < sequence.length; i++) {
const keyframe = sequence[i];
if (keyframe.at > startTime && keyframe.at < endTime) {
motionUtils.removeItem(sequence, keyframe);
// If we remove this item we have to push the pointer back one
i--;
}
}
}
function addKeyframes(sequence, keyframes, easing, offset, startTime, endTime) {
/**
* Erase every existing value between currentTime and targetTime,
* this will essentially splice this timeline into any currently
* defined ones.
*/
eraseKeyframes(sequence, startTime, endTime);
for (let i = 0; i < keyframes.length; i++) {
sequence.push({
value: keyframes[i],
at: mixNumber(startTime, endTime, offset[i]),
easing: getEasingForSegment(easing, i),
});
}
}
/**
* Take an array of times that represent repeated keyframes. For instance
* if we have original times of [0, 0.5, 1] then our repeated times will
* be [0, 0.5, 1, 1, 1.5, 2]. Loop over the times and scale them back
* down to a 0-1 scale.
*/
function normalizeTimes(times, repeat) {
for (let i = 0; i < times.length; i++) {
times[i] = times[i] / (repeat + 1);
}
}
function compareByTime(a, b) {
if (a.at === b.at) {
if (a.value === null)
return 1;
if (b.value === null)
return -1;
return 0;
}
else {
return a.at - b.at;
}
}
const defaultSegmentEasing = "easeInOut";
const MAX_REPEAT = 20;
function createAnimationsFromSequence(sequence, { defaultTransition = {}, ...sequenceTransition } = {}, scope, generators) {
const defaultDuration = defaultTransition.duration || 0.3;
const animationDefinitions = new Map();
const sequences = new Map();
const elementCache = {};
const timeLabels = new Map();
let prevTime = 0;
let currentTime = 0;
let totalDuration = 0;
/**
* Build the timeline by mapping over the sequence array and converting
* the definitions into keyframes and offsets with absolute time values.
* These will later get converted into relative offsets in a second pass.
*/
for (let i = 0; i < sequence.length; i++) {
const segment = sequence[i];
/**
* If this is a timeline label, mark it and skip the rest of this iteration.
*/
if (typeof segment === "string") {
timeLabels.set(segment, currentTime);
continue;
}
else if (!Array.isArray(segment)) {
timeLabels.set(segment.name, calcNextTime(currentTime, segment.at, prevTime, timeLabels));
continue;
}
let [subject, keyframes, transition = {}] = segment;
/**
* If a relative or absolute time value has been specified we need to resolve
* it in relation to the currentTime.
*/
if (transition.at !== undefined) {
currentTime = calcNextTime(currentTime, transition.at, prevTime, timeLabels);
}
/**
* Keep track of the maximum duration in this definition. This will be
* applied to currentTime once the definition has been parsed.
*/
let maxDuration = 0;
const resolveValueSequence = (valueKeyframes, valueTransition, valueSequence, elementIndex = 0, numSubjects = 0) => {
const valueKeyframesAsList = keyframesAsList(valueKeyframes);
const { delay = 0, times = defaultOffset(valueKeyframesAsList), type = "keyframes", repeat, repeatType, repeatDelay = 0, ...remainingTransition } = valueTransition;
let { ease = defaultTransition.ease || "easeOut", duration } = valueTransition;
/**
* Resolve stagger() if defined.
*/
const calculatedDelay = typeof delay === "function"
? delay(elementIndex, numSubjects)
: delay;
/**
* If this animation should and can use a spring, generate a spring easing function.
*/
const numKeyframes = valueKeyframesAsList.length;
const createGenerator = motionDom.isGenerator(type)
? type
: generators?.[type];
if (numKeyframes <= 2 && createGenerator) {
/**
* As we're creating an easing function from a spring,
* ideally we want to generate it using the real distance
* between the two keyframes. However this isn't always
* possible - in these situations we use 0-100.
*/
let absoluteDelta = 100;
if (numKeyframes === 2 &&
isNumberKeyframesArray(valueKeyframesAsList)) {
const delta = valueKeyframesAsList[1] - valueKeyframesAsList[0];
absoluteDelta = Math.abs(delta);
}
const springTransition = { ...remainingTransition };
if (duration !== undefined) {
springTransition.duration = motionUtils.secondsToMilliseconds(duration);
}
const springEasing = motionDom.createGeneratorEasing(springTransition, absoluteDelta, createGenerator);
ease = springEasing.ease;
duration = springEasing.duration;
}
duration ?? (duration = defaultDuration);
const startTime = currentTime + calculatedDelay;
/**
* If there's only one time offset of 0, fill in a second with length 1
*/
if (times.length === 1 && times[0] === 0) {
times[1] = 1;
}
/**
* Fill out if offset if fewer offsets than keyframes
*/
const remainder = times.length - valueKeyframesAsList.length;
remainder > 0 && fillOffset(times, remainder);
/**
* If only one value has been set, ie [1], push a null to the start of
* the keyframe array. This will let us mark a keyframe at this point
* that will later be hydrated with the previous value.
*/
valueKeyframesAsList.length === 1 &&
valueKeyframesAsList.unshift(null);
/**
* Handle repeat options
*/
if (repeat) {
motionUtils.invariant(repeat < MAX_REPEAT, "Repeat count too high, must be less than 20");
duration = calculateRepeatDuration(duration, repeat);
const originalKeyframes = [...valueKeyframesAsList];
const originalTimes = [...times];
ease = Array.isArray(ease) ? [...ease] : [ease];
const originalEase = [...ease];
for (let repeatIndex = 0; repeatIndex < repeat; repeatIndex++) {
valueKeyframesAsList.push(...originalKeyframes);
for (let keyframeIndex = 0; keyframeIndex < originalKeyframes.length; keyframeIndex++) {
times.push(originalTimes[keyframeIndex] + (repeatIndex + 1));
ease.push(keyframeIndex === 0
? "linear"
: getEasingForSegment(originalEase, keyframeIndex - 1));
}
}
normalizeTimes(times, repeat);
}
const targetTime = startTime + duration;
/**
* Add keyframes, mapping offsets to absolute time.
*/
addKeyframes(valueSequence, valueKeyframesAsList, ease, times, startTime, targetTime);
maxDuration = Math.max(calculatedDelay + duration, maxDuration);
totalDuration = Math.max(targetTime, totalDuration);
};
if (isMotionValue(subject)) {
const subjectSequence = getSubjectSequence(subject, sequences);
resolveValueSequence(keyframes, transition, getValueSequence("default", subjectSequence));
}
else {
const subjects = resolveSubjects(subject, keyframes, scope, elementCache);
const numSubjects = subjects.length;
/**
* For every element in this segment, process the defined values.
*/
for (let subjectIndex = 0; subjectIndex < numSubjects; subjectIndex++) {
/**
* Cast necessary, but we know these are of this type
*/
keyframes = keyframes;
transition = transition;
const thisSubject = subjects[subjectIndex];
const subjectSequence = getSubjectSequence(thisSubject, sequences);
for (const key in keyframes) {
resolveValueSequence(keyframes[key], getValueTransition(transition, key), getValueSequence(key, subjectSequence), subjectIndex, numSubjects);
}
}
}
prevTime = currentTime;
currentTime += maxDuration;
}
/**
* For every element and value combination create a new animation.
*/
sequences.forEach((valueSequences, element) => {
for (const key in valueSequences) {
const valueSequence = valueSequences[key];
/**
* Arrange all the keyframes in ascending time order.
*/
valueSequence.sort(compareByTime);
const keyframes = [];
const valueOffset = [];
const valueEasing = [];
/**
* For each keyframe, translate absolute times into
* relative offsets based on the total duration of the timeline.
*/
for (let i = 0; i < valueSequence.length; i++) {
const { at, value, easing } = valueSequence[i];
keyframes.push(value);
valueOffset.push(motionUtils.progress(0, totalDuration, at));
valueEasing.push(easing || "easeOut");
}
/**
* If the first keyframe doesn't land on offset: 0
* provide one by duplicating the initial keyframe. This ensures
* it snaps to the first keyframe when the animation starts.
*/
if (valueOffset[0] !== 0) {
valueOffset.unshift(0);
keyframes.unshift(keyframes[0]);
valueEasing.unshift(defaultSegmentEasing);
}
/**
* If the last keyframe doesn't land on offset: 1
* provide one with a null wildcard value. This will ensure it
* stays static until the end of the animation.
*/
if (valueOffset[valueOffset.length - 1] !== 1) {
valueOffset.push(1);
keyframes.push(null);
}
if (!animationDefinitions.has(element)) {
animationDefinitions.set(element, {
keyframes: {},
transition: {},
});
}
const definition = animationDefinitions.get(element);
definition.keyframes[key] = keyframes;
definition.transition[key] = {
...defaultTransition,
duration: totalDuration,
ease: valueEasing,
times: valueOffset,
...sequenceTransition,
};
}
});
return animationDefinitions;
}
function getSubjectSequence(subject, sequences) {
!sequences.has(subject) && sequences.set(subject, {});
return sequences.get(subject);
}
function getValueSequence(name, sequences) {
if (!sequences[name])
sequences[name] = [];
return sequences[name];
}
function keyframesAsList(keyframes) {
return Array.isArray(keyframes) ? keyframes : [keyframes];
}
function getValueTransition(transition, key) {
return transition && transition[key]
? {
...transition,
...transition[key],
}
: { ...transition };
}
const isNumber = (keyframe) => typeof keyframe === "number";
const isNumberKeyframesArray = (keyframes) => keyframes.every(isNumber);
function animateElements(elementOrSelector, keyframes, options, scope) {
const elements = motionDom.resolveElements(elementOrSelector, scope);
const numElements = elements.length;
motionUtils.invariant(Boolean(numElements), "No valid element provided.");
const animations = [];
for (let i = 0; i < numElements; i++) {
const element = elements[i];
const elementTransition = { ...options };
/**
* Resolve stagger function if provided.
*/
if (typeof elementTransition.delay === "function") {
elementTransition.delay = elementTransition.delay(i, numElements);
}
for (const valueName in keyframes) {
const valueKeyframes = keyframes[valueName];
const valueOptions = {
...motionDom.getValueTransition(elementTransition, valueName),
};
valueOptions.duration && (valueOptions.duration = motionUtils.secondsToMilliseconds(valueOptions.duration));
valueOptions.delay && (valueOptions.delay = motionUtils.secondsToMilliseconds(valueOptions.delay));
animations.push(new motionDom.NativeAnimation({
element,
name: valueName,
keyframes: valueKeyframes,
transition: valueOptions,
allowFlatten: !elementTransition.type && !elementTransition.ease,
}));
}
}
return animations;
}
function animateSequence(definition, options) {
const animations = [];
createAnimationsFromSequence(definition, options).forEach(({ keyframes, transition }, element) => {
animations.push(...animateElements(element, keyframes, transition));
});
return new motionDom.GroupAnimationWithThen(animations);
}
const createScopedWaapiAnimate = (scope) => {
function scopedAnimate(elementOrSelector, keyframes, options) {
return new motionDom.GroupAnimationWithThen(animateElements(elementOrSelector, keyframes, options, scope));
}
return scopedAnimate;
};
const animateMini = /*@__PURE__*/ createScopedWaapiAnimate();
exports.animate = animateMini;
exports.animateSequence = animateSequence;