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import React from 'react';
import PropTypes from 'react-peek/prop-types';
import { lucidClassNames } from '../../util/style-helpers';
import { Overwrite, getFirst, omitProps } from '../../util/component-types';
import SlidePanel, {
ISlidePanelProps,
ISlidePanelSlideProps,
} from '../SlidePanel/SlidePanel';
const cx = lucidClassNames.bind('&-InfiniteSlidePanel');
const { func, node, number, oneOfType, string } = PropTypes;
const modulo = (n: number, a: number): number => {
return a - n * Math.floor(a / n);
};
interface IInfiniteSlidePanelSlideProps extends ISlidePanelSlideProps {}
const InfiniteSlidePanelSlide = (_props: IInfiniteSlidePanelSlideProps): null =>
null;
InfiniteSlidePanelSlide.displayName = 'InfiniteSlidePanel.Slide';
InfiniteSlidePanelSlide.propName = 'Slide';
InfiniteSlidePanelSlide.peek = { description: `The slide.` };
export interface IInfiniteSlidePanelPropsRaw {
/** The only allowed child is a render function which is passed the current
slide's offset and returns the slide contents. Alternatively, you could pass one
`<InfiniteSlidePanelSlide {...}>` element with the render function.
The only reason do to the latter is to pass addiontal props to the slide
element. */
children?: React.ReactNode | ((slideOffset: number) => React.ReactNode);
/** The number of slides rendered at any given time. A good rule-of-thumb is
that this should be at least 4 times the \`slidesToShow\` value. */
totalSlides: number;
/** Animate slides transitions from changes in `offset`. */
isAnimated: boolean;
/** Slides are rendered in a continuous loop, where the first slide repeats
* after the last slide and vice-versa. DOM elements are re-ordered and
* re-used. */
isLooped: boolean;
Slide?: React.ReactNode;
}
type IInfiniteSlidePanelProps = Overwrite<
ISlidePanelProps,
IInfiniteSlidePanelPropsRaw
>;
const defaultProps = {
offset: 0,
slidesToShow: 1,
onSwipe: _.noop,
totalSlides: 8,
isAnimated: SlidePanel.defaultProps.isAnimated,
isLooped: SlidePanel.defaultProps.isLooped,
};
export const InfiniteSlidePanel = (
props: IInfiniteSlidePanelProps
): React.ReactElement => {
const {
children,
className,
offset,
slidesToShow,
onSwipe,
totalSlides,
...passThroughs
} = props;
const slide = getFirst(
props,
InfiniteSlidePanel.Slide,
<InfiniteSlidePanelSlide>{children}</InfiniteSlidePanelSlide>
) as React.ReactElement;
const slideChildRenderFunction = slide.props.children;
if (!_.isFunction(slideChildRenderFunction)) {
throw new Error(
'InfiniteSlidePanel children must be a single function `(slideOffset) => { /* returns React.PropTypes.node */ }`'
);
}
const halfSlides = Math.floor(totalSlides / 2);
const circularOffset = modulo(totalSlides, offset);
const forwardSlideOffsets = _.times(
totalSlides - halfSlides,
(n: number): number => offset + n
);
const backwardSlideOffsets = _.times(
halfSlides,
(n: number): number => offset + n - halfSlides
);
const transposedSlideOffsets = forwardSlideOffsets.concat(
backwardSlideOffsets
);
const slideOffsetArray = _.takeRight(
transposedSlideOffsets,
circularOffset
).concat(_.take(transposedSlideOffsets, totalSlides - circularOffset));
return (
<SlidePanel
{...omitProps<IInfiniteSlidePanelProps>(
passThroughs,
undefined,
_.keys(InfiniteSlidePanel.propTypes),
false
)}
className={cx('&', className)}
offset={offset}
slidesToShow={slidesToShow}
onSwipe={onSwipe}
isLooped
>
{_.map(
slideOffsetArray,
(slideOffset, elementOffset): React.ReactElement => (
<SlidePanel.Slide
key={elementOffset}
{...slide.props}
className={cx(
{
'&-Slide-in-frame':
slideOffset - offset < slidesToShow &&
slideOffset - offset >= 0,
},
slide.props.className
)}
>
{slideChildRenderFunction(slideOffset)}
</SlidePanel.Slide>
)
)}
</SlidePanel>
);
};
InfiniteSlidePanel.defaultProps = defaultProps;
InfiniteSlidePanel.Slide = InfiniteSlidePanelSlide;
InfiniteSlidePanel._isPrivate = true;
InfiniteSlidePanel.displayName = 'InfiniteSlidePanel';
InfiniteSlidePanel.peek = {
description: `
A container for rendering an infinite set of horizontal slides.
Translation between slides is controlled by passing in a new
\`offset\`. Can hook into touch events to update the \`offset\`. This
component is made from SlidePanel, so it accepts the same props.
`,
categories: ['helpers'],
madeFrom: ['SlidePanel'],
};
InfiniteSlidePanel.propTypes = {
className: string`
Appended to the component-specific class names set on the root element.
`,
children: oneOfType([node, func])`
The only allowed child is a render function which is passed the current
slide's offset and returns the slide contents: \`(slideOffset) => {
//returns React.PropTypes.node }\` Alternatively, you could pass one
\`<InfiniteSlidePanel.Slide {...}>\` element with the render function.
The only reason do to the latter is to pass addiontal props to the slide
element.
`,
offset: number`
The offset of the left-most rendered slide.
`,
slidesToShow: number`
Max number of viewable slides to show simultaneously.
`,
onSwipe: func`
Called when a user's swipe would change the offset. Callback passes
number of slides by the user (positive for forward swipes, negative for
backwards swipes). Signature: \`(slidesSwiped, { event, props }) => {}\`
`,
totalSlides: number`
The number of slides rendered at any given time. A good rule-of-thumb is
that this should be at least 4 times the \`slidesToShow\` value.
`,
Slide: node,
};
export default InfiniteSlidePanel;
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