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PullToRefresh.tsx
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PullToRefresh.tsx
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import React from 'react';
import classNames from 'classnames';
import { PropsType, Indicator } from './PropsType';
class StaticRenderer extends React.Component<any, any> {
shouldComponentUpdate(nextProps: any) {
return nextProps.shouldUpdate;
}
render() {
return <div>{this.props.render()}</div>;
}
}
function setTransform(nodeStyle: any, value: any) {
nodeStyle.transform = value;
nodeStyle.webkitTransform = value;
nodeStyle.MozTransform = value;
}
const isWebView = typeof navigator !== 'undefined' &&
/(iPhone|iPod|iPad).*AppleWebKit(?!.*Safari)/i.test(navigator.userAgent);
const DOWN = 'down';
const UP = 'up';
const INDICATOR = { activate: 'release', deactivate: 'pull', release: 'loading', finish: 'finish' };
let supportsPassive = false;
try {
const opts = Object.defineProperty({}, 'passive', {
get() {
supportsPassive = true;
},
});
window.addEventListener('test', null as any, opts);
} catch (e) {
// empty
}
const willPreventDefault = supportsPassive ? { passive: false } : false;
// const willNotPreventDefault = supportsPassive ? { passive: true } : false;
export default class PullToRefresh extends React.Component<PropsType, any> {
static defaultProps = {
prefixCls: 'rmc-pull-to-refresh',
getScrollContainer: () => undefined,
direction: DOWN,
distanceToRefresh: 25,
damping: 100,
indicator: INDICATOR as Indicator,
scale: 0.6,
} as PropsType;
// https://github.com/yiminghe/zscroller/blob/2d97973287135745818a0537712235a39a6a62a1/src/Scroller.js#L355
// currSt: `activate` / `deactivate` / `release` / `finish`
state = {
currSt: 'deactivate',
dragOnEdge: false,
};
containerRef: any;
contentRef: any;
_to: any;
_ScreenY: any;
_startScreenY: any;
// X 横向判断用于锁定滑动方向
_startScreenX: any;
_lastScreenY: any;
_timer: any;
_isMounted = false;
shouldUpdateChildren = false;
shouldComponentUpdate(nextProps: any) {
this.shouldUpdateChildren = this.props.children !== nextProps.children;
return true;
}
componentDidUpdate(prevProps: any) {
if (prevProps === this.props || prevProps.refreshing === this.props.refreshing) {
return;
}
// triggerPullToRefresh 需要尽可能减少 setState 次数
this.triggerPullToRefresh();
}
componentDidMount() {
// `getScrollContainer` most likely return React.Node at the next tick. Need setTimeout
setTimeout(() => {
this.init(this.props.getScrollContainer() || this.containerRef);
this.triggerPullToRefresh();
this._isMounted = true;
});
}
componentWillUnmount() {
// Should have no setTimeout here!
this.destroy(this.props.getScrollContainer() || this.containerRef);
}
triggerPullToRefresh = () => {
// 在初始化时、用代码 自动 触发 pullToRefresh
// 注意:当 direction 为 up 时,当 visible length < content length 时、则看不到效果
// 添加this._isMounted的判断,否则组建一实例化,currSt就会是finish
if (!this.state.dragOnEdge && this._isMounted) {
if (this.props.refreshing) {
if (this.props.direction === UP) {
this._lastScreenY = - this.props.distanceToRefresh - 1;
}
if (this.props.direction === DOWN) {
this._lastScreenY = this.props.distanceToRefresh + 1;
}
// change dom need after setState
this.setState({ currSt: 'release' }, () => this.setContentStyle(this._lastScreenY));
} else {
this.setState({ currSt: 'finish' }, () => this.reset());
}
}
}
init = (ele: any) => {
if (!ele) {
// like return in destroy fn ???!!
return;
}
this._to = {
touchstart: this.onTouchStart.bind(this, ele),
touchmove: this.onTouchMove.bind(this, ele),
touchend: this.onTouchEnd.bind(this, ele),
touchcancel: this.onTouchEnd.bind(this, ele),
};
Object.keys(this._to).forEach(key => {
ele.addEventListener(key, this._to[key], willPreventDefault);
});
}
destroy = (ele: any) => {
if (!this._to || !ele) {
// componentWillUnmount fire before componentDidMount, like forceUpdate ???!!
return;
}
Object.keys(this._to).forEach(key => {
ele.removeEventListener(key, this._to[key]);
});
}
onTouchStart = (_ele: any, e: any) => {
this._ScreenY = this._startScreenY = e.touches[0].screenY;
this._startScreenX = e.touches[0].screenX;
// 一开始 refreshing 为 true 时 this._lastScreenY 有值
this._lastScreenY = this._lastScreenY || 0;
}
isEdge = (ele: any, direction: string) => {
const container = this.props.getScrollContainer();
if (container && container === document.body) {
// In chrome61 `document.body.scrollTop` is invalid
const scrollNode = document.scrollingElement ? document.scrollingElement : document.body;
if (direction === UP) {
return scrollNode.scrollHeight - scrollNode.scrollTop <= window.innerHeight;
}
if (direction === DOWN) {
return scrollNode.scrollTop <= 0;
}
}
if (direction === UP) {
return ele.scrollHeight - ele.scrollTop === ele.clientHeight;
}
if (direction === DOWN) {
return ele.scrollTop <= 0;
}
}
damping = (dy: number): number => {
if (Math.abs(this._lastScreenY) > this.props.damping!) {
return 0;
}
const ratio = Math.abs(this._ScreenY - this._startScreenY) / window.screen.height;
dy *= (1 - ratio) * this.props.scale!;
return dy;
}
onTouchMove = (ele: any, e: any) => {
// 使用 pageY 对比有问题
const _screenY = e.touches[0].screenY;
const _screenX = e.touches[0].screenX;
const { direction } = this.props;
// 横向滑动不处理
if (Math.abs(_screenX - this._startScreenX) > 20 * window.devicePixelRatio) {
return;
}
// 拖动方向不符合的不处理
if (direction === UP && this._startScreenY < _screenY ||
direction === DOWN && this._startScreenY > _screenY) {
return;
}
if (this.isEdge(ele, direction)) {
if (!this.state.dragOnEdge) {
// 当用户开始往上滑的时候isEdge还是false的话,会导致this._ScreenY不是想要的,只有当isEdge为true时,再上滑,才有意义
// 下面这行代码解决了上面这个问题
this._ScreenY = this._startScreenY = e.touches[0].screenY;
this.setState({ dragOnEdge: true });
}
e.preventDefault();
// add stopPropagation with fastclick will trigger content onClick event. why?
// ref https://github.com/ant-design/ant-design-mobile/issues/2141
// e.stopPropagation();
const _diff = Math.round(_screenY - this._ScreenY);
this._ScreenY = _screenY;
this._lastScreenY += this.damping(_diff);
this.setContentStyle(this._lastScreenY);
if (Math.abs(this._lastScreenY) < this.props.distanceToRefresh) {
if (this.state.currSt !== 'deactivate') {
// console.log('back to the distance');
this.setState({ currSt: 'deactivate' });
}
} else {
if (this.state.currSt === 'deactivate') {
// console.log('reach to the distance');
this.setState({ currSt: 'activate' });
}
}
// https://github.com/ant-design/ant-design-mobile/issues/573#issuecomment-339560829
// iOS UIWebView issue, It seems no problem in WKWebView
if (isWebView && e.changedTouches[0].clientY < 0) {
this.onTouchEnd();
}
}
}
onTouchEnd = () => {
if (this.state.dragOnEdge) {
this.setState({ dragOnEdge: false });
}
if (this.state.currSt === 'activate') {
this.setState({ currSt: 'release' });
this._timer = setTimeout(() => {
if (!this.props.refreshing) {
this.setState({ currSt: 'finish' }, () => this.reset());
}
this._timer = undefined;
}, 1000);
this.props.onRefresh();
} else {
this.reset();
}
}
reset = () => {
this._lastScreenY = 0;
this.setContentStyle(0);
}
setContentStyle = (ty: number) => {
// todos: Why sometimes do not have `this.contentRef` ?
if (this.contentRef) {
setTransform(this.contentRef.style, `translate3d(0px,${ty}px,0)`);
}
}
render() {
const props = { ...this.props };
delete props.damping;
const {
className, prefixCls, children, getScrollContainer,
direction, onRefresh, refreshing, indicator, distanceToRefresh, ...restProps,
} = props;
const renderChildren = <StaticRenderer
shouldUpdate={this.shouldUpdateChildren} render={() => children} />;
const renderRefresh = (cls: string) => {
const cla = classNames(cls, !this.state.dragOnEdge && `${prefixCls}-transition`);
return (
<div className={`${prefixCls}-content-wrapper`}>
<div className={cla} ref={el => this.contentRef = el}>
{direction === UP ? renderChildren : null}
<div className={`${prefixCls}-indicator`}>
{(indicator as any)[this.state.currSt] || (INDICATOR as any)[this.state.currSt]}
</div>
{direction === DOWN ? renderChildren : null}
</div>
</div>
);
};
if (getScrollContainer()) {
return renderRefresh(`${prefixCls}-content ${prefixCls}-${direction}`);
}
return (
<div
ref={el => this.containerRef = el}
className={classNames(className, prefixCls, `${prefixCls}-${direction}`)}
{...restProps}
>
{renderRefresh(`${prefixCls}-content`)}
</div>
);
}
}