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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Carousel</title>
<script>
function enableGesture(main) {
const pressDuration = 500;
let contexts = Object.create(null);
let mouseSymbol = Symbol("mouse");
let mouseStart = event => {
document.addEventListener("mousemove", mouseMove);
document.addEventListener("mouseup", mouseEnd);
contexts[mouseSymbol] = Object.create(null);
start(event, contexts[mouseSymbol]);
}
let mouseMove = event => {
move(event, contexts[mouseSymbol]);
}
let mouseEnd = event => {
document.removeEventListener("mousemove", mouseMove);
document.removeEventListener("mouseup", mouseEnd);
end(event, contexts[mouseSymbol]);
delete contexts[mouseSymbol];
}
main.addEventListener("mousedown", mouseStart);
let touchStart = event => {
for (let touch of event.changedTouches) {
contexts[touch.identifier] = Object.create(null);
start(touch, contexts[touch.identifier]);
}
}
let touchMove = event => {
for (let touch of event.changedTouches) {
move(touch, contexts[touch.identifier]);
}
}
let touchEnd = event => {
for (let touch of event.changedTouches) {
end(touch, contexts[touch.identifier]);
delete contexts[touch.identifier];
}
}
let touchCancel = event => {
for (let touch of event.changedTouches) {
cancel(touch, contexts[touch.identifier]);
}
}
let start = (point, context) => {
context.startX = point.clientX;
context.startY = point.clientY;
context.isTap = true;
context.isPan = false;
context.isPress = false;
context.startTime = Date.now();
context.pressHandler = setTimeout(() => {
context.isTap = false;
context.isPress = true;
let e = new Event("pressstart");
main.dispatchEvent(e);
context.pressHandler = null;
}, pressDuration);
}
let move = (point, context) => {
let dx = point.clientX - context.startX, dy = point.clientY - context.startY;
if (dx * dx + dy * dy > 100) {
if (context.isPan == false) {
if (context.pressHandler !== null) {
clearTimeout(context.pressHandler);
context.pressHandler = null;
}
if (context.isPress) {
let e = new Event("presscancel");
main.dispatchEvent(e);
}
context.isTap = false;
context.isPan = true;
if (Math.abs(dx) > Math.abs(dy)) {
context.isHorizontal = true;
context.isVertical = false;
}
else {
context.isHorizontal = false;
context.isVertical = true;
}
let e = new Event("panstart");
e.startX = context.startX;
e.startY = context.startY;
main.dispatchEvent(e);
}
else {
let e = new Event("pan");
e.dx = dx;
e.dy = dy;
e.isHorizontal = context.isHorizontal;
e.isVertical = context.isVertical;
main.dispatchEvent(e);
if (context.isPress) {
let e = new Event("presspan");
e.dx = dx;
e.dy = dy;
e.isHorizontal = context.isHorizontal;
e.isVertical = context.isVertical;
main.dispatchEvent(e);
}
}
}
}
let end = (point, context) => {
if (context.pressHandler !== null) {
clearTimeout(context.pressHandler);
context.pressHandler = null;
}
if (context.isTap) {
let e = new Event("tap");
main.dispatchEvent(e);
}
let dx = point.clientX - context.startX, dy = point.clientY - context.startY;
if (context.isPress) {
if (context.isPan) {
let e = new Event("presspanend")
e.dx = dx;
e.dy = dy;
e.isHorizontal = context.isHorizontal;
e.isVertical = context.isVertical;
main.dispatchEvent(e);
}
else {
let e = new Event("press");
main.dispatchEvent(e);
}
}
if (context.isPan) {
let v = Math.sqrt(dx * dx + dy * dy) / (Date.now() - context.startTime);
if (v > 0.3) {
let e = new Event("flick");
e.dx = dx;
e.dy = dy;
e.isHorizontal = context.isHorizontal;
e.isVertical = context.isVertical;
context.isFlick = true;
main.dispatchEvent(e);
}
else {
context.isFlick = false;
}
let e = new Event("panend");
e.dx = dx;
e.dy = dy;
e.isHorizontal = context.isHorizontal;
e.isVertical = context.isVertical;
e.isFlick = context.isFlick;
main.dispatchEvent(e);
}
}
let cancel = (point, context) => {
if (context.pressHandler !== null) {
clearTimeout(context.pressHandler);
context.pressHandler = null;
}
if (context.isPan) {
let e = new Event("pancancel");
e.isHorizontal = context.isHorizontal;
e.isVertical = context.isVertical;
main.dispatchEvent(e);
}
if (context.isPress) {
let e = new Event("pressdisrupt");
main.dispatchEvent(e);
}
}
main.addEventListener("touchstart", touchStart);
main.addEventListener("touchmove", touchMove);
main.addEventListener("touchend", touchEnd);
main.addEventListener("touchcancel", touchCancel);
}
</script>
<script>
function cubicBezier(p1x, p1y, p2x, p2y) {
const ZERO_LIMIT = 1e-6;
// Calculate the polynomial coefficients,
// implicit first and last control points are (0,0) and (1,1).
const ax = 3 * p1x - 3 * p2x + 1;
const bx = 3 * p2x - 6 * p1x;
const cx = 3 * p1x;
const ay = 3 * p1y - 3 * p2y + 1;
const by = 3 * p2y - 6 * p1y;
const cy = 3 * p1y;
function sampleCurveDerivativeX(t) {
// `ax t^3 + bx t^2 + cx t' expanded using Horner 's rule.
return (3 * ax * t + 2 * bx) * t + cx;
}
function sampleCurveX(t) {
return ((ax * t + bx) * t + cx) * t;
}
function sampleCurveY(t) {
return ((ay * t + by) * t + cy) * t;
}
// Given an x value, find a parametric value it came from.
function solveCurveX(x) {
var t2 = x;
var derivative;
var x2;
// https://trac.webkit.org/browser/trunk/Source/WebCore/platform/animation
// First try a few iterations of Newton's method -- normally very fast.
// http://en.wikipedia.org/wiki/Newton's_method
for (let i = 0; i < 8; i++) {
// f(t)-x=0
x2 = sampleCurveX(t2) - x;
if (Math.abs(x2) < ZERO_LIMIT) {
return t2;
}
derivative = sampleCurveDerivativeX(t2);
// == 0, failure
/* istanbul ignore if */
if (Math.abs(derivative) < ZERO_LIMIT) {
break;
}
t2 -= x2 / derivative;
}
// Fall back to the bisection method for reliability.
// bisection
// http://en.wikipedia.org/wiki/Bisection_method
var t1 = 1;
/* istanbul ignore next */
var t0 = 0;
/* istanbul ignore next */
t2 = x;
/* istanbul ignore next */
while (t1 > t0) {
x2 = sampleCurveX(t2) - x;
if (Math.abs(x2) < ZERO_LIMIT) {
return t2;
}
if (x2 > 0) {
t1 = t2;
} else {
t0 = t2;
}
t2 = (t1 + t0) / 2;
}
// Failure
return t2;
}
function solve(x) {
return sampleCurveY(solveCurveX(x));
}
return solve;
}
let linear = cubicBezier(0, 0, 1, 1);
let ease = cubicBezier(.25, .1, .25, 1);
let easeIn = cubicBezier(.42, 0, 1, 1);
let easeOut = cubicBezier(0, 0, .58, 1);
let easeInOut = cubicBezier(.42, 0, .58, 1);
let myCB = cubicBezier(.69, -0.85, .25, 1);
class Timeline {
constructor() {
this._animations = [];
this.pauseTime = 0;
this.status = "inited";
this._startPoint = 0;
this._rate = 1;
}
pause() {
if (this.status !== "started")
return;
this.status = "paused";
this._resumeTick = this._tick;
this._tick = null;
this._pauseStart = Date.now();
}
resume() {
if (this.status !== "paused")
return;
this.status = "started";
this.pauseTime += Date.now() - this._pauseStart;
this._tick = this._resumeTick;
requestAnimationFrame(this._tick);
}
restart() {
if (this._tick)
this._tick = null;
this.status = "inited";
this._resumeTick = null;
this.start();
// requestAnimationFrame(()=> this.start());
}
start() {
if (this.status === "started")
return;
this.status = "started";
let startTime = Date.now();
this.pauseTime = 0;
this._tick = () => {
for (let animation of this._animations) {
animation.tick((Date.now() - this.pauseTime - startTime) * this._rate + this._startPoint);
}
if (this._tick)
requestAnimationFrame(this._tick);
}
requestAnimationFrame(this._tick);
}
set rate(value) {
this._rate = value;
}
get rate() {
return this._rate;
}
set startPoint(value) {
this._startPoint = value;
}
get startPoint() {
return this._startPoint;
}
addAnimation(animation) {
this._animations.push(animation);
}
removeAnimation(animation) {
}
clearAnimations() {
this._animations = [];
}
}
class DOMElementStyleNumberAnimation {
constructor(element, property, startTime, startValue, endTime, endValue, transitCurve, converter) {
this._element = element;
this._property = property;
this._startTime = startTime;
this._startValue = startValue;
this._endTime = endTime;
this._endValue = endValue;
this._transitCurve = transitCurve;
this._converter = converter;
this._fixKeyFrame = false;
}
tick(t) {
// if t>this._endTime解决两个动画无缝衔接问题
if (t > this._endTime) {
if (!this._fixKeyFrame)
return;
else {
t = this._endTime;
this._fixKeyFrame = false;
}
}
else if (t < this._startTime) {
if (!this._fixKeyFrame)
return;
else {
t = this._startTime;
this._fixKeyFrame = false;
}
} else {
this._fixKeyFrame = true;
}
let progress = (t - this._startTime) / (this._endTime - this._startTime);
let displacement = this._transitCurve(progress) * (this._endValue - this._startValue);
let currentValue = displacement + this._startValue;
// console.log("coverter=",this._converter(currentValue))
this._element.style[this._property] = this._converter(currentValue);
}
}
class DOMElementStyleVectorAnimation {
constructor(element, property, startTime, startValue, endTime, endValue, transitCurve, converter) {
this._element = element;
this._property = property;
this._startTime = startTime;
this._startValue = startValue;
this._endTime = endTime;
this._endValue = endValue;
this._transitCurve = transitCurve
this._converter = converter;
this._fixKeyFrame = false;
}
tick(t) {
// if t>this._endTime解决两个动画无缝衔接问题
if (t > this._endTime) {
if (!this._fixKeyFrame)
return;
else {
t = this._endTime;
this._fixKeyFrame = false;
}
}
else if (t < this._startTime) {
if (!this._fixKeyFrame)
return;
else {
t = this._startTime;
this._fixKeyFrame = false;
}
} else {
this._fixKeyFrame = true;
}
let progress = (t - this._startTime) / (this._endTime - this._startTime);
let displacement = [];
let currentValue = [];
for (let i = 0; i < this._endValue.length; i++) {
displacement[i] = this._transitCurve(progress) * (this._endValue[i] - this._startValue[i]);
currentValue[i] = displacement[i] + this._startValue[i];
}
this._element.style[this._property] = this._converter(currentValue);
}
}
</script>
</head>
<style>
#container{
width: 500px;
height: 300px;
}
.carousel {
width: 100%;
height: 100%;
white-space: nowrap;
overflow: hidden;
/* overflow: visible;
outline: solid 1px blue;
transform: translate(500px); */
}
.carousel>img {
width: 100%;
height: 100%;
display: inline-block;
}
.carouselDot{
margin: -30px 0 0 0;
width:100%;
height:30px;
text-align: center;
}
.carouselDot>div{
display: inline-block;
margin:0 5px;
height: 10px;
width: 10px;
border-radius: 5px;
background-color: white;
opacity: 0.3;
}
</style>
<body>
<div id="container">
<div></div>
<div></div>
</div>
</body>
<script type="text/javascript">
let data = [
"https://static001.geekbang.org/resource/image/bb/21/bb38fb7c1073eaee1755f81131f11d21.jpg",
"https://static001.geekbang.org/resource/image/1b/21/1b809d9a2bdf3ecc481322d7c9223c21.jpg",
"https://static001.geekbang.org/resource/image/b6/4f/b6d65b2f12646a9fd6b8cb2b020d754f.jpg",
"https://static001.geekbang.org/resource/image/73/e4/730ea9c393def7975deceb48b3eb6fe4.jpg"];
let link=[
"https://time.geekbang.org/column/article/82764",
"https://time.geekbang.org/column/article/83302",
"https://time.geekbang.org/column/article/83719",
"https://time.geekbang.org/column/article/83860"];
class Carousel {
constructor(container, duration = 3000, elementWidth = 500, transitMethod = ease, transitionDuration = 500) {
this._container = container.firstElementChild;
this._dotDisplay = container.lastElementChild;
this._duration = duration;
this._container.classList.add("carousel");
this._dotDisplay.classList.add("carouselDot");
this._handler = null;
this.data = null;
this.elementWidth = elementWidth;
this.transitMethod = transitMethod;
this.transitionDuration = transitionDuration;
}
render() {
this._container.innerHTML = "";
for (let d in this.data) {
let e = document.createElement("img");
let dot = document.createElement("div");
e.src = this.data[d];
//若不设置transform，则无法获取到图片实时位置
e.style.transform = `translate(0px)`;
//若图片数量大于2，则把序列最后一张图片放在第一张图片的左侧，这样可以被起始的拖动看到
if (parseInt(d) === this.data.length -1 && this.data.length > 2){
e.style.transform= `translate(-${this.elementWidth * ( 1 + parseInt(d))}px)`;
}
// // 解决点被图片盖住的问题，原因是图片设置了transform
dot.style.transform = `translate(0px)`;
this._container.appendChild(e);
this._dotDisplay.appendChild(dot);
}
let offsetTimeStart = 0;
let currentTranstitionDuration = 0;
let tl = new Timeline();
let position = 0;
let children = Array.prototype.slice.call(this._container.children);
this.elementWidth = Math.max(...children.map(i=>i.width));
let dots = Array.prototype.slice.call(this._dotDisplay.children);
dots[position].style['background-color'] = 'black';
let positionOf = (element) =>{
let position = element.style.transform.match(/\((.*?)\)/g)[0];
if (position.slice(position.length-2,position.length-1) === "%"){
return parseInt(position.slice(1, position.length - 2))*this.elementWidth/100;}
else if (position.slice(position.length - 3, position.length - 1) === "px"){
return parseInt(position.slice(1,position.length-3));}
else
console.log("positionOf error, positoin=", position);
}
let nextFrame = (i = 1) => {
let current = children[position];
let nextPosition = (position+1)%children.length;
let next = children[nextPosition];
let nextNextPosition = (nextPosition + 1) % children.length;
let nextNext = children[nextNextPosition];
offsetTimeStart = Date.now();
tl.clearAnimations();
if (i === -1){
current.style.transform = `translate(${-this.elementWidth - this.elementWidth * position}px)`;
}
else {
//由于无法从ease等动作的位移推断经过时间，若动作不是linear，从暂停状态再次加载动作（比如点击提示点，pan等动作）时动画时间与正常动画时间有出入。
let currentPo = positionOf(current);
let currentDis = Math.abs(-this.elementWidth - this.elementWidth * position - currentPo)/this.elementWidth;
tl.addAnimation(new DOMElementStyleNumberAnimation(
current,
"transform",
0, currentPo,
currentDis * this.transitionDuration, -this.elementWidth - this.elementWidth * position,
this.transitMethod,
(v) => `translateX(${v}px)`
));
}
if (i === 1){
nextNext.style.transform = `translate(${this.elementWidth - this.elementWidth * nextNextPosition}px)`;
}
else {
let nextNextPo = positionOf(nextNext);
let nextNextDis = Math.abs(this.elementWidth - this.elementWidth * nextNextPosition - nextNextPo) / this.elementWidth;
tl.addAnimation(new DOMElementStyleNumberAnimation(
nextNext,
"transform",
0, nextNextPo,
nextNextDis * this.transitionDuration, this.elementWidth - this.elementWidth * nextNextPosition,
this.transitMethod,
(v) => `translateX(${v}px)`
));
}
let nextPo = positionOf(next);
let nextDis = Math.abs(- this.elementWidth * nextPosition - nextPo) / this.elementWidth;
tl.addAnimation(new DOMElementStyleNumberAnimation(
next,
"transform",
0, nextPo,
this.transitionDuration * nextDis, - this.elementWidth * nextPosition,
this.transitMethod,
(v) => `translateX(${v}px)`
));
tl.restart();
position = nextPosition;
//由于图片整体向左错了一位，所以dots[0]指向第二张图片，
//提示点变色
setTimeout(() => {
let previousPosition = (position + children.length - 1) % children.length;
for (let i in dots){
dots[i].style['background-color'] = (parseInt(i)=== position) ? 'black':'white';
}
}, this.transitionDuration)
this._handler = setTimeout(() => {
nextFrame();
}, this._duration);
}
this._handler = setTimeout(() => {
nextFrame();
}, this._duration);
let offset = 0;
let currentTime = 0;
enableGesture(this._container);
for (let i in dots){
dots[i].addEventListener("mousedown", event => {
if (tl.status !== "paused") {
tl.pause();
clearTimeout(this._handler);
delete (this._handler);
currentTime = Date.now();
if (currentTime - offsetTimeStart < this.transitionDuration)
offset = (1 - this.transitMethod((currentTime - offsetTimeStart) / this.transitionDuration)) * this.elementWidth;
else
offset = 0;
}
let iInt = parseInt(i);
let current = children[position];
let previousPosition = (position + children.length - 1) % children.length;
let previous = children[previousPosition];
let displacement = null;
let iIntPo = null;
if (iInt === position || iInt === previousPosition){
position = (iInt + children.length - 1) % children.length;
//向右移动的时候选中图片左侧图片有可能在视框右边，这样就会发成该图片飘过视框的现象，只有末端图片飘过视框时会造成视觉影响，将其作为特别情况处理。
if (iInt === 0){
children[children.length-1].style.transform = `translate(${- this.elementWidth - this.elementWidth * (children.length-1)}px)`;
}
nextFrame(0);
return;
}
if (iInt<position){
//提示点图片在current的左边，该图片与previous,current三张图片右移
iIntPo = this.elementWidth * (-2 - iInt) + offset
children[iInt].style.transform = `translate(${iIntPo}px)`;
displacement = 1;
}
else {
//提示点图片在current的右边，该图片与previous,current三张图片左移
iIntPo = this.elementWidth - this.elementWidth * iInt + offset
children[iInt].style.transform = `translate(${iIntPo}px)`;
displacement = -1;
}
//移动提示点位置图片以及previous,current三张图片
let currentPo = positionOf(current);
let currentPoN = this.elementWidth *(displacement - position);
let currentDis = Math.abs(currentPoN - currentPo) / this.elementWidth;
let previousPo = positionOf(previous);
let previousPoN = this.elementWidth * (displacement - previousPosition);
let previousDis = Math.abs(previousPoN - previousPo) / this.elementWidth;
let iIntPoN = - this.elementWidth * iInt;
let iIntDis = Math.abs(iIntPoN - iIntPo) / this.elementWidth;
tl.clearAnimations();
tl.addAnimation(new DOMElementStyleNumberAnimation(
current,
"transform",
0, currentPo,
this.transitionDuration * currentDis, currentPoN,
this.transitMethod,
(v) => `translateX(${v}px)`
));
tl.addAnimation(new DOMElementStyleNumberAnimation(
previous,
"transform",
0, previousPo,
this.transitionDuration * previousDis, previousPoN,
this.transitMethod,
(v) => `translateX(${v}px)`
));
tl.addAnimation(new DOMElementStyleNumberAnimation(
children[iInt],
"transform",
0, iIntPo,
this.transitionDuration * iIntDis, iIntPoN,
this.transitMethod,
(v) => `translateX(${v}px)`
));
tl.restart();
position = iInt;
//由于图片整体向左错了一位，所以dots[0]指向第二张图片，
//提示点变色，将现图片右侧图片移到右侧,现图片左侧图片移到左侧，
setTimeout(() => {
let previousPosition = (position + children.length - 1) % children.length;
let nextPosition = (position + children.length + 1) % children.length;
for (let i in dots) {
dots[i].style['background-color'] = (parseInt(i) === position) ? 'black' : 'white';
}
children[previousPosition].style.transform = `translate(${ - this.elementWidth - this.elementWidth * previousPosition}px)`
children[nextPosition].style.transform = `translate(${this.elementWidth - this.elementWidth * nextPosition}px)`
}, this.transitionDuration)
this._handler = setTimeout(() => {`translate(${this.elementWidth - this.elementWidth * iInt + offset}px)`
nextFrame();
//若提示点图片并非current或previous，此动画持续时间会大于this.transitionDuration,时长有可能大于this._duration
}, this._duration);
});
}
this._container.addEventListener("tap", (event) => { window.open(link[position]) });
this._container.addEventListener("pan", event => {
if (event.isVertical)
return;
if (tl.status !== "paused"){
tl.pause();
clearTimeout(this._handler);
delete (this._handler);
currentTime= Date.now();
if (currentTime - offsetTimeStart < this.transitionDuration)
offset =(1-this.transitMethod((currentTime-offsetTimeStart)/this.transitionDuration))*this.elementWidth;
else
offset = 0;
}
let current = children[position];
let nextPosition = (position + 1) % children.length;
let next = children[nextPosition];
let previousPosition = (position + children.length - 1) % children.length;
let previous = children[previousPosition];
current.style.transform = `translate(${- position * this.elementWidth + event.dx+offset}px`;
next.style.transform = `translate(${this.elementWidth-this.elementWidth * nextPosition +event.dx+offset}px)`;
previous.style.transform = `translate(${this.elementWidth * ( - 1 - previousPosition) + event.dx+offset}px)`;
});
this._container.addEventListener("panend", event => {
let condition = 0;
if (event.isVertical)
return;
if(event.isFlick && Math.abs(event.dx)>Math.abs(event.dy)){
condition = (event.dx < 0) ? 1 : -1;
}
else{
let x = event.dx;
condition = (x < -this.elementWidth/2) ? 1 : (x > this.elementWidth/2) ? -1 : 0;
}
position = (offset < this.elementWidth) ? ((position - 1 + 4 + condition) % 4) : ((position - 2 + 4 + condition) % 4);
nextFrame(condition);
});
this._container.addEventListener("pancancel", event => {
let condition = 0;
position = (offset < this.elementWidth)? ((position - 1 + 4 + condition) % 4) : ((position - 2 + 4 + condition) % 4);
nextFrame(condition);
});
this._container.addEventListener("mousedown", event => event.preventDefault());
}
}
let duration = 3000;
let elementWidth = 500;
let transitionMethod = linear;
let transitionDuration = 500;
let carousel = new Carousel(document.getElementById("container"),duration, elementWidth, transitionMethod, transitionDuration);
carousel.data = data;
carousel.render();
</script>
</html>