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import React from 'react';
import ColumnHeader from './column_header';
import PropTypes from 'prop-types';
const easingOutQuint = (x, t, b, c, d) => c*((t=t/d-1)*t*t*t*t + 1) + b;
const scrollTop = (node) => {
const startTime = Date.now();
const offset = node.scrollTop;
const targetY = -offset;
const duration = 1000;
let interrupt = false;
const step = () => {
const elapsed = Date.now() - startTime;
const percentage = elapsed / duration;
if (percentage > 1 || interrupt) {
return;
}
node.scrollTop = easingOutQuint(0, elapsed, offset, targetY, duration);
requestAnimationFrame(step);
};
step();
return () => {
interrupt = true;
};
};
class Column extends React.PureComponent {
constructor (props, context) {
super(props, context);
this.handleHeaderClick = this.handleHeaderClick.bind(this);
this.handleWheel = this.handleWheel.bind(this);
this.setRef = this.setRef.bind(this);
}
handleHeaderClick () {
const scrollable = this.node.querySelector('.scrollable');
if (!scrollable) {
return;
}
this._interruptScrollAnimation = scrollTop(scrollable);
}
handleWheel () {
if (typeof this._interruptScrollAnimation !== 'undefined') {
this._interruptScrollAnimation();
}
}
setRef (c) {
this.node = c;
}
render () {
const { heading, icon, children, active, hideHeadingOnMobile } = this.props;
let columnHeaderId = null
let header = '';
if (heading) {
columnHeaderId = heading.replace(/ /g, '-')
header = <ColumnHeader icon={icon} active={active} type={heading} onClick={this.handleHeaderClick} hideOnMobile={hideHeadingOnMobile} columnHeaderId={columnHeaderId}/>;
}
return (
<div
ref={this.setRef}
role='region'
aria-labelledby={columnHeaderId}
className='column'
onWheel={this.handleWheel}>
{header}
{children}
</div>
);
}
}
Column.propTypes = {
heading: PropTypes.string,
icon: PropTypes.string,
children: PropTypes.node,
active: PropTypes.bool,
hideHeadingOnMobile: PropTypes.bool
};
export default Column;
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