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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 | 7x 10x 10x 10x 10x 10x 10x 2x 2x 2x 10x 10x 10x 10x 10x 20x 30x 30x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 3x 7x 10x 2x 2x 2x 2x 1x 1x 2x 2x 2x 2x 1x 1x | import {
useState,
useMemo,
useRef,
type HTMLAttributes,
useEffect,
} from 'react';
import cn from 'classnames';
import { brushX, select, event, scaleLinear, type BrushBehavior } from 'd3';
import Histogram, { type Range } from './histogram';
import useSize from '../hooks/useSize';
import '../styles/components/histogram-filter.scss';
type Props = {
/**
* The left-most, smallest, value the histogram starts at irrespective of the
* array values. Defaults to min(values).
*/
min?: number;
/**
* The right-most, largest, value the histogram ends at irrespective of the
* array values. Defaults to max(values).
*/
max?: number;
/**
* An array of values which the histogram is based on.
*/
values: number[];
/**
* An array of unfiltered values which the histogram is based on.
* (useful to calculate max bin height)
*/
unfilteredValues?: number[];
/**
* A value which specifies the start and end points selected by the user.
*/
selectedRange: Range;
/**
* A callback that returns the selected and final (ie after drag) range.
*/
onChange: (range: Range) => unknown;
/**
* Number of bins (intervals) which the values are allocated to.
* Each interval is of the size (max - min) / nBins. Defaults to 50.
*/
nBins?: number;
/**
* The height in pixels of the bin with the most values. Defaults to 300.
*/
height?: number;
/**
* Display a shadow of the unfiltered data (opacity value)
*/
unfilteredValuesShadow?: number;
/**
* Additional CSS classnames to apply (eg secondary, tertiary)
*/
className?: string;
};
const HistogramFilter = ({
min: minOrUndef,
max: maxOrUndef,
values,
unfilteredValues,
unfilteredValuesShadow,
selectedRange,
onChange,
nBins = 30,
height = 50,
className,
...props
}: Props & Omit<HTMLAttributes<HTMLDivElement>, 'onChange'>) => {
const d3ContainerRef = useRef<SVGSVGElement>(null);
const [size] = useSize(d3ContainerRef);
const brushRef = useRef<BrushBehavior<unknown> | null>(null);
const onChangeRef = useRef(onChange);
onChangeRef.current = onChange;
const [min, max] = useMemo(() => {
// Assign sensible default values if not provided
const innerMin =
minOrUndef === undefined ? Math.min(...values) : minOrUndef;
const innerMax =
maxOrUndef === undefined ? Math.max(...values) : maxOrUndef;
return [innerMin, innerMax];
}, [maxOrUndef, minOrUndef, values]);
const [startInput, setStartInput] = useState(`${min}`);
const [endInput, setEndInput] = useState(`${max}`);
useEffect(() => {
Iif (!size) {
return; // Can't position the brush correctly until we have a size
}
// Scale
const scale = scaleLinear().domain([min, max]).range([0, size.width]);
// On brush event
const getOnBrush = (type?: string) => () => {
const range = event.selection;
// Update only if an event caused this to be called (not programmatic)
Iif (event.sourceEvent && range) {
const start = +`${scale.invert(range[0]).toPrecision(4)}`;
const end = +`${scale.invert(range[1]).toPrecision(4)}`;
setStartInput(`${start}`);
setEndInput(`${end}`);
if (type === 'end') {
// Only when user stops brushing, send the new values
onChangeRef.current([start, end]);
}
}
};
// Brush
brushRef.current = brushX()
.extent([
[0, 0],
[size.width, size.height],
])
.on('start brush', getOnBrush())
.on('end', getOnBrush('end'));
// Tie the brush to the DOM
const selection = select(d3ContainerRef.current).append('g');
brushRef.current(selection);
// eslint-disable-next-line consistent-return
return () => {
// Unbind listeners
brushRef.current?.on('start brush end', null);
// Remove selection
selection.remove();
};
}, [size, min, max]);
// Update the brush programatically when props are changed
useEffect(() => {
Iif (!size) {
return; // Can't position the brush correctly until we have a size
}
const scale = scaleLinear().domain([min, max]).range([0, size.width]);
// If the brush corresponds to the full range, remove it completely
if (selectedRange[0] === min && selectedRange[1] === max) {
brushRef.current?.move(select(d3ContainerRef.current).select('g'), null);
} else {
brushRef.current?.move(select(d3ContainerRef.current).select('g'), [
scale(selectedRange[0])!,
scale(selectedRange[1])!,
]);
}
}, [min, max, selectedRange, size]);
return (
<div className={cn('histogram-filter', className)} {...props}>
<Histogram
values={values}
unfilteredValues={unfilteredValues}
unfilteredValuesShadow={unfilteredValuesShadow}
selectedRange={selectedRange}
nBins={nBins}
min={min}
max={max}
height={height}
>
{/* Brush container */}
<svg ref={d3ContainerRef} width="100%" height="100%" />
</Histogram>
<div className="histogram-filter__text-input-container">
<input
type="text"
onChange={(e) => {
const textValue = e.target.value;
// Always update the input text state, regardless of if valid or not
setStartInput(e.target.value);
const numberValue = +textValue;
// Only if the number if valid do we keep it in the range state
if (
!Number.isNaN(numberValue) &&
numberValue < selectedRange[1] &&
numberValue >= min
) {
onChange([numberValue, selectedRange[1]]);
}
}}
// On blur, set the input text state to whatever value is in range
// state and move the brush
onBlur={() => setStartInput(`${selectedRange[0]}`)}
value={startInput}
style={{ width: `${startInput.length + 2}ch` }}
/>
<input
type="text"
onChange={(e) => {
const textValue = e.target.value;
// Always update the input text state, regardless of if valid or not
setEndInput(e.target.value);
const numberValue = +textValue;
// Only if the number if valid do we keep it in the range state
if (
!Number.isNaN(numberValue) &&
numberValue > selectedRange[0] &&
numberValue <= max
) {
onChange([selectedRange[0], numberValue]);
}
}}
// On blur, reset the input text state to whatever value is in range
onBlur={() => setEndInput(`${selectedRange[1]}`)}
value={endInput}
style={{ width: `${endInput.length + 2}ch` }}
/>
</div>
</div>
);
};
export default HistogramFilter;
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