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185 lines
6.0 KiB
185 lines
6.0 KiB
/* @flow */
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import * as React from 'react';
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import raf from 'raf';
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import { getViewportHeight, getScrollX, getScrollY } from 'utils/windowUtils';
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import styled from 'styled-components';
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import colors from 'config/colors';
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type Props = {
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children?: React.Node,
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}
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type State = {
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prevScrollY: number;
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asideMinHeight: number,
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wrapperTopOffset: number,
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wrapperLeftOffset: number,
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wrapperBottomPadding: number,
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footerFixed: boolean,
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}
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const AsideWrapper = styled.aside.attrs({
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style: ({ minHeight }) => ({
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minHeight,
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}),
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})`
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position: relative;
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top: 0px;
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width: 320px;
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min-width: 320px;
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overflow: hidden;
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background: ${colors.MAIN};
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border-right: 1px solid ${colors.DIVIDER};
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`;
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const StickyContainerWrapper = styled.div.attrs({
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style: ({ top, left, paddingBottom }) => ({
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top,
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left,
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paddingBottom,
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}),
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})`
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position: fixed;
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border-right: 1px solid ${colors.DIVIDER};
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width: 320px;
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overflow: hidden;
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`;
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export default class StickyContainer extends React.PureComponent<Props, State> {
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constructor() {
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super();
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this.state = {
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prevScrollY: 0,
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asideMinHeight: 0,
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wrapperTopOffset: 0,
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wrapperLeftOffset: 0,
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wrapperBottomPadding: 0,
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footerFixed: false,
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};
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}
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componentDidMount() {
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window.addEventListener('scroll', this.handleScroll);
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window.addEventListener('resize', this.handleScroll);
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this.update();
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}
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componentDidUpdate(prevProps: Props, newState: State) {
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// recalculate view only if props was changed
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// ignore when state is changed
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if (this.state === newState) raf(this.update);
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}
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componentWillUnmount() {
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window.removeEventListener('scroll', this.handleScroll);
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window.removeEventListener('resize', this.handleScroll);
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}
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update = () => {
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this.recalculatePosition();
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}
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handleScroll = () => raf(this.update);
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asideRefCallback = (element: ?HTMLElement) => {
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this.aside = element;
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}
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wrapperRefCallback = (element: ?HTMLElement) => {
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this.wrapper = element;
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}
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footerRefCallback = (element: ?HTMLElement) => {
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this.footer = element;
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}
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aside: ?HTMLElement;
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wrapper: ?HTMLElement;
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footer: ?HTMLElement;
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recalculatePosition() {
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const { aside, wrapper, footer } = this;
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if (!aside || !wrapper || !footer) return;
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const viewportHeight = getViewportHeight();
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const asideBounds = aside.getBoundingClientRect();
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const wrapperBounds = wrapper.getBoundingClientRect();
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const footerBounds = footer.getBoundingClientRect();
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const isHeaderFixed = asideBounds.top < 0;
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const isWrapperBiggerThanViewport = wrapperBounds.height > viewportHeight;
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const state = { ...this.state };
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const scrollX = getScrollX();
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const scrollY = getScrollY();
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if (isHeaderFixed) {
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if (isWrapperBiggerThanViewport) {
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const scrollDirection = scrollY >= state.prevScrollY ? 'down' : 'up';
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const topOutOfBounds: boolean = (wrapperBounds.top > 0 && scrollDirection === 'up');
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const bottomOutOfBounds: boolean = (footerBounds.bottom <= viewportHeight && scrollDirection === 'down');
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if (!topOutOfBounds && !bottomOutOfBounds) {
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// neither "top" or "bottom" was reached
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// scroll whole wrapper
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const distanceScrolled = Math.abs(scrollY - state.prevScrollY);
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state.wrapperTopOffset += scrollDirection === 'down' ? -distanceScrolled : distanceScrolled;
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}
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}
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// make sure that wrapper will not be over scrolled
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if (state.wrapperTopOffset > 0) state.wrapperTopOffset = 0;
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const maxScrollTop = viewportHeight - wrapperBounds.height;
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if (maxScrollTop < 0 && state.wrapperTopOffset < maxScrollTop) state.wrapperTopOffset = maxScrollTop;
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} else {
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// update wrapper "top" to be same as "aside" element
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state.wrapperTopOffset = asideBounds.top;
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}
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if (isWrapperBiggerThanViewport) {
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state.footerFixed = false;
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} else if (state.footerFixed) {
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if (footerBounds.top < wrapperBounds.bottom - footerBounds.height) {
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state.footerFixed = false;
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}
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} else if (footerBounds.bottom < viewportHeight) {
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state.footerFixed = asideBounds.height > wrapperBounds.height;
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}
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state.prevScrollY = scrollY;
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state.asideMinHeight = wrapperBounds.height;
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state.wrapperBottomPadding = state.footerFixed ? footerBounds.height : 0;
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// update wrapper "left" position
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state.wrapperLeftOffset = scrollX > 0 ? -scrollX : asideBounds.left;
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this.setState(state);
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}
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render() {
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return (
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<AsideWrapper
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footerFixed={this.state.footerFixed}
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minHeight={this.state.asideMinHeight}
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ref={this.asideRefCallback}
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onScroll={this.handleScroll}
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onTouchStart={this.handleScroll}
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onTouchMove={this.handleScroll}
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onTouchEnd={this.handleScroll}
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>
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<StickyContainerWrapper
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paddingBottom={this.state.wrapperBottomPadding}
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top={this.state.wrapperTopOffset}
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left={this.state.wrapperLeftOffset}
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ref={this.wrapperRefCallback}
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>
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{React.Children.map(this.props.children, (child) => { // eslint-disable-line arrow-body-style
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return child.key === 'sticky-footer' ? React.cloneElement(child, {
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ref: this.footerRefCallback,
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position: this.state.footerFixed ? 'fixed' : 'relative',
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}) : child;
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})}
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</StickyContainerWrapper>
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</AsideWrapper>
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);
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}
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} |