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| import _ from 'lodash';
import React from 'react';
import PropTypes from 'prop-types';
import { Motion, spring } from 'react-motion';
import { QUICK_SLIDE_MOTION } from '../../constants/motion-spring';
import { lucidClassNames } from '../../util/style-helpers';
import { shiftChildren } from '../../util/dom-helpers';
import { createClass, findTypes, omitProps } from '../../util/component-types';
const cx = lucidClassNames.bind('&-SlidePanel');
const { bool, func, node, number, string } = PropTypes;
const modulo = (n, a) => a - n * Math.floor(a / n);
/**
* {"categories": ["helpers"]}
*
* A container for rendering a set of horizontal slides at at a particular
* offset. Translation between slides is controlled by passing in a new `offset`.
* Can hook into touch events to update the `offset`.
*/
const SlidePanel = createClass({
displayName: 'SlidePanel',
_isPrivate: true,
components: {
Slide: createClass({
displayName: 'SlidePanel.Slide',
propName: 'Slide',
}),
},
propTypes: {
/**
* Appended to the component-specific class names set on the root element.
*/
className: string,
/**
* SlidePanel.Slide elements are passed in as children.
*/
children: node,
/**
* Max number of viewable slides to show simultaneously.
*/
slidesToShow: number,
/**
* The offset of the left-most rendered slide.
*/
offset: number,
/**
* Animate slides transitions from changes in `offset`.
*/
isAnimated: bool,
/**
* 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: bool,
/**
* 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 }) => {}`
*/
onSwipe: func,
},
getDefaultProps() {
return {
slidesToShow: 1,
offset: 0,
isAnimated: true,
onSwipe: _.noop,
isLooped: false,
};
},
getInitialState() {
return {
translateXPixel: 0,
};
},
handleTouchStart(event) {
this.startX = event.touches[0].screenX;
this.isAnimated = false;
this.isDragging = true;
},
handleTouchMove(event) {
const dX = event.touches[0].screenX - this.startX;
this.setState({
translateXPixel: dX,
});
},
handleTouchEnd(event) {
const dX = event.changedTouches[0].screenX - this.startX;
const slideWidth =
this.rootNode.getBoundingClientRect().width / this.props.slidesToShow;
const slidesSwiped = Math.round(dX / slideWidth);
Eif (slidesSwiped !== 0) {
this.props.onSwipe(-1 * slidesSwiped, { event, props: this.props });
}
this.setState({
translateXPixel: 0,
});
this.isAnimated = this.props.isAnimated;
this.isDragging = false;
},
componentWillMount() {
const slides = findTypes(this.props, SlidePanel.Slide);
this.isAnimated = this.props.isAnimated;
this.isDragging = false;
this.offsetTranslate = this.props.isLooped
? Math.floor(_.size(slides) / 2)
: 0;
},
componentDidMount() {
const slides = findTypes(this.props, SlidePanel.Slide);
this.slideStrip = this.rootNode.querySelector(
'.lucid-SlidePanel-slidestrip'
);
Eif (this.props.isLooped) {
shiftChildren(this.slideStrip, Math.floor(_.size(slides) / 2));
}
},
componentDidUpdate(prevProps, prevState) {
const slides = findTypes(this.props, SlidePanel.Slide);
const offsetDiff = this.props.offset - prevProps.offset;
if (offsetDiff !== 0) {
Eif (this.props.isLooped) {
this.offsetTranslate = modulo(
_.size(slides),
this.offsetTranslate - offsetDiff
);
_.delay(() => {
shiftChildren(this.slideStrip, -offsetDiff);
this.isAnimated = false;
this.forceUpdate();
this.isAnimated = this.props.isAnimated;
}, 200);
}
}
},
render: function() {
const {
className,
slidesToShow,
offset: realOffset,
isLooped,
...passThroughs
} = this.props;
const offset = realOffset + this.offsetTranslate;
const slides = findTypes(this.props, SlidePanel.Slide);
const translateXPercentage =
-1 *
(100 / slidesToShow) *
(isLooped ? modulo(_.size(slides), offset) : offset);
return (
<div
{...omitProps(passThroughs, SlidePanel)}
ref={domNode => {
this.rootNode = domNode;
}}
className={cx('&', className)}
>
<Motion
style={
this.isAnimated
? {
translateXPercentage: spring(
translateXPercentage,
QUICK_SLIDE_MOTION
),
translateXPixel: spring(
this.state.translateXPixel,
QUICK_SLIDE_MOTION
),
}
: {
translateXPercentage: translateXPercentage,
translateXPixel: this.state.translateXPixel,
}
}
>
{tween => (
<div
{...omitProps(passThroughs, SlidePanel)}
className={cx('&-slidestrip', className)}
style={{
transform: this.isDragging
? `translateX(calc(${tween.translateXPercentage}% + ${this.state.translateXPixel}px))`
: `translateX(calc(${tween.translateXPercentage}% + ${tween.translateXPixel}px))`,
}}
onTouchStart={this.handleTouchStart}
onTouchMove={this.handleTouchMove}
onTouchEnd={this.handleTouchEnd}
onTouchCancel={_.noop}
>
{_.map(slides, (slide, offset) => (
<div
key={offset}
{...slide.props}
className={cx('&-Slide', slide.props.className)}
style={{
flexGrow: 1,
flexShrink: 0,
flexBasis: `${100 / slidesToShow}%`,
...slide.props.style,
}}
/>
))}
</div>
)}
</Motion>
</div>
);
},
});
export default SlidePanel;
|