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import * as React from 'react';
import { PureComponent } from 'react';
import { ComponentProps } from '../../types';
const ENOUGH_TIME_FOR_RERENDER = 50;
const DEFAULT_HEIGHT = 0;
const DEFAULT_DURATION = 200;
const DEFAULT_FADE_HEIGHT = 50;
const DEFAULT_TRANSPARENT_COLOR = 'rgba(255, 255, 255, 0)';
const DEFAULT_FADE_COLOR = 'rgba(255, 255, 255, 1)';
export interface CollapseProps
extends ComponentProps,
React.HTMLAttributes<HTMLDivElement> {
/**
* Whether the collapse is open or not
* @default false
*/
open: boolean;
/**
* Duration of the animation (milliseconds)
* @default 200
*/
animationDuration?: number;
/**
* Maximum height when collapsed
* @default 0
*/
maxCollapsedHeight?: number | string;
/**
* Minimum height
* @default auto
*/
minHeight?: number | string;
/**
* Whether to fade out the content
* @default false
*/
fadeOut?: boolean;
/**
* Color to fade to
* @default rgba(255, 255, 255, 1)
*/
fadeColor?: string;
/**
* Transparent color to fade from (this should be a transparent version of the fadeColor)
* @default rgba(255, 255, 255, 0)
*/
transparentColor?: string;
/**
* Height of the faded area
* @default 50
*/
fadeHeight?: number;
}
export interface CollapseState {
// tslint:disable-line:no-unused-variable
height: number | string;
opened: boolean;
opening: boolean;
}
/**
* Component to expand and collapse content, optionally displaying a small preview.
*/
export class Collapse extends PureComponent<CollapseProps, CollapseState> {
private element: Element;
private timeout: number;
public constructor(props: CollapseProps) {
super(props);
const { maxCollapsedHeight = DEFAULT_HEIGHT, open } = props;
this.state = {
height: maxCollapsedHeight,
opening: false,
opened: open,
};
}
public componentDidUpdate(previousProps: CollapseProps) {
if (this.props.open !== previousProps.open) {
window.clearTimeout(this.timeout);
const {
maxCollapsedHeight = DEFAULT_HEIGHT,
animationDuration = DEFAULT_DURATION,
} = this.props;
this.setState({
opened: false,
opening: previousProps.open,
height: this.props.open
? maxCollapsedHeight
: this.element.scrollHeight,
});
this.timeout = window.setTimeout(() => {
this.setState({
opened: false,
opening: this.props.open,
height: this.props.open
? this.element.scrollHeight
: maxCollapsedHeight,
});
this.timeout = window.setTimeout(() => {
this.setState({
opened: this.props.open,
opening: this.props.open,
});
}, animationDuration);
}, ENOUGH_TIME_FOR_RERENDER);
}
}
public componentDidMount() {
const { maxCollapsedHeight = DEFAULT_HEIGHT } = this.props;
this.setState({
height: this.props.open ? this.element.scrollHeight : maxCollapsedHeight,
});
}
public componentWillUnmount() {
window.clearTimeout(this.timeout);
}
public render() {
const {
children,
className,
fadeOut,
fadeColor = DEFAULT_FADE_COLOR,
fadeHeight = DEFAULT_FADE_HEIGHT,
transparentColor = DEFAULT_TRANSPARENT_COLOR,
open,
maxCollapsedHeight,
minHeight = null,
animationDuration = DEFAULT_DURATION,
component: Component = 'div',
...remainingProps
} = this.props;
const { opening, opened, height } = this.state;
const collapseStyle = {
minHeight,
maxHeight: opened ? null : height,
position: 'relative' as 'relative',
overflow: 'hidden' as 'hidden',
transition: `ease-in-out ${animationDuration}ms max-height`,
};
const fadeStyle = {
height: fadeHeight,
width: '100%',
position: 'absolute' as 'absolute',
bottom: 0,
opacity: opening ? 0 : 1,
background: `linear-gradient(${transparentColor}, ${fadeColor} 80%)`,
transition: `ease-in-out ${animationDuration}ms opacity`,
};
return (
<Component
ref={(element: HTMLDivElement) => (this.element = element)}
{...remainingProps}
className={classNames(
'clearfix collapse',
open ? 'collapse-open' : null,
className
)}
style={collapseStyle}
>
{children}
{fadeOut &&
!opened && <div className="collapse-fade" style={fadeStyle} />}
</Component>
);
}
}
export default Collapse;
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