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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | 6x 6x 6x 6x 6x 1x 1x 12x 12x 6x 6x 6x 6x 1x 6x 4x 4x 4x 4x 6x 6x 6x 5x 5x 6x 1x 1x 1x 6x 12x 42x 42x 1x 1x | import React from 'react';
import PropTypes from 'prop-types';
import ResizeObserver from 'resize-observer-polyfill';
import Photo, { photoPropType } from './Photo';
import { computeSizes, computeSizesColumns } from './utils';
class Gallery extends React.Component {
state = {
containerWidth: 0,
};
componentDidMount() {
this.animationFrameID = null;
this.observer = new ResizeObserver(entries => {
// only do something if width changes
const newWidth = entries[0].contentRect.width;
if (this.state.containerWidth !== newWidth) {
// put in an animation frame to stop "benign errors" from
// ResizObserver https://stackoverflow.com/questions/49384120/resizeobserver-loop-limit-exceeded
this.animationFrameID = window.requestAnimationFrame(() => {
this.setState({ containerWidth: Math.floor(newWidth) });
});
}
});
this.observer.observe(this._gallery);
}
componentWillUnmount() {
this.observer.disconnect();
window.cancelAnimationFrame(this.animationFrameID);
}
handleClick = (event, { index }) => {
const { photos, onClick } = this.props;
onClick(event, {
index,
photo: photos[index],
previous: photos[index - 1] || null,
next: photos[index + 1] || null,
});
};
render() {
const containerWidth = this.state.containerWidth;
// no containerWidth until after first render with refs, skip calculations and render nothing
if (!containerWidth) return <div ref={c => (this._gallery = c)}> </div>;
const { ImageComponent = Photo } = this.props;
// subtract 1 pixel because the browser may round up a pixel
const { margin, onClick, direction } = this.props;
let { columns } = this.props;
// allow parent to calculate columns from containerWidth
if (typeof columns === 'function') {
columns = columns(containerWidth);
}
// set default breakpoints if user doesn't specify columns prop
if (columns === undefined) {
columns = 1;
Eif (containerWidth >= 500) columns = 2;
if (containerWidth >= 900) columns = 3;
Iif (containerWidth >= 1500) columns = 4;
}
const photos = this.props.photos;
const width = containerWidth - 1;
let galleryStyle, thumbs;
if (direction === 'row') {
galleryStyle = { display: 'flex', flexWrap: 'wrap', flexDirection: 'row' };
thumbs = computeSizes({ width, columns, margin, photos });
}
if (direction === 'column') {
galleryStyle = { position: 'relative' };
thumbs = computeSizesColumns({ width, columns, margin, photos });
galleryStyle.height = thumbs[thumbs.length - 1].containerHeight;
}
return (
<div className="react-photo-gallery--gallery">
<div ref={c => (this._gallery = c)} style={galleryStyle}>
{thumbs.map((photo, index) => {
const { left, top, containerHeight, ...rest } = photo;
return (
<ImageComponent
key={photo.key || photo.src}
margin={margin}
index={index}
photo={rest}
direction={direction}
left={left}
top={top}
onClick={onClick ? this.handleClick : null}
/>
);
})}
</div>
</div>
);
}
}
Gallery.propTypes = {
photos: PropTypes.arrayOf(photoPropType).isRequired,
direction: PropTypes.string,
onClick: PropTypes.func,
columns: PropTypes.oneOfType([PropTypes.func, PropTypes.number]),
margin: PropTypes.number,
ImageComponent: PropTypes.func,
};
Gallery.defaultProps = {
margin: 2,
direction: 'row',
};
export default Gallery;
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