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import ColumnHeader from './column_header';
import PureRenderMixin from 'react-addons-pure-render-mixin';
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;
};
};
const Column = React.createClass({
propTypes: {
heading: React.PropTypes.string,
icon: React.PropTypes.string,
children: React.PropTypes.node,
active: React.PropTypes.bool
},
mixins: [PureRenderMixin],
handleHeaderClick () {
let node = ReactDOM.findDOMNode(this);
this._interruptScrollAnimation = scrollTop(node.querySelector('.scrollable'));
},
handleWheel () {
if (typeof this._interruptScrollAnimation !== 'undefined') {
this._interruptScrollAnimation();
}
},
render () {
const { heading, icon, children, active } = this.props;
let header = '';
if (heading) {
header = <ColumnHeader icon={icon} active={active} type={heading} onClick={this.handleHeaderClick} />;
}
return (
<div className='column' onWheel={this.handleWheel}>
{header}
{children}
</div>
);
}
});
export default Column;
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