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import React, { useState } from 'react';
import { Colors, getFontSize, getHeight, Size, getFormLabelSize, isDark, INumberProps } from '../../global';
import './Slider.scss';
export interface ISliderProps extends INumberProps {
multithumb: boolean;
autorangeMinVal?: number; // minimimum value that min can have when autoranging
autorangeMinSize?: number; // minimum difference between min and max when autoranging
autorange?: number; // automatically adjust min/max to be +/- autorange/2 around the current value when the thumb is 15% from the min/max, or when the multithumbs are within 20% of the range and the range is bigger than autorange
endNumber?: number;
setEndNumber?: (newVal: number) => void;
setFinalNumber?: (newVal: number) => void;
setFinalEndNumber?: (newVal: number) => void;
decimals?: number;
step?: number;
minDiff?: number;
}
let lastVal = 0; // bcz: WHY do I have to do this?? the pointerdown event locks in the value of 'valLoc' when it's created so need some other way to get the current value to that old handler...
let lastEndVal = 0;
export const Slider = (props: ISliderProps) => {
const [width, setWidth] = useState<number>(100);
const [valLoc, setNumberLoc] = useState<number>(props.number ?? props.min + (props.max - props.min) / 2);
const [endNumberLoc, setEndNumberLoc] = useState<number>(props.endNumber ?? props.min + (2 * (props.max - props.min)) / 3);
const [min, setMin] = useState<number>(props.min);
const [max, setMax] = useState<number>(props.max);
const {
formLabel,
formLabelPlacement,
multithumb,
autorange,
autorangeMinVal,
autorangeMinSize,
decimals,
step = 1,
number = valLoc,
endNumber = endNumberLoc,
minDiff = (max - min) / 20,
size = Size.SMALL,
height,
unit,
onPointerDown,
setNumber,
setEndNumber,
setFinalNumber,
setFinalEndNumber,
color = Colors.MEDIUM_BLUE,
fillWidth,
} = props;
const toDecimal = (num: number) => (decimals !== undefined ? Math.round(num * Math.pow(10, decimals)) / Math.pow(10, decimals) : num);
const getLeftPos = (locVal: number) => {
const dragger = getHeight(+(height || 0), size);
return ((locVal - min) / (max - min)) * (width - dragger);
};
const getValueLabel = (locVal: number): JSX.Element => {
return (
<div
className="rs-label-container"
style={{
left: `${getLeftPos(locVal)}px`,
background: color,
color: isDark(color) ? Colors.LIGHT_GRAY : Colors.DARK_GRAY,
fontSize: getFontSize(size),
height: getHeight(+(height || 0), size),
width: getHeight(+(height || 0), size),
top: 0,
}}>
<span className="rs-label">{toDecimal(locVal)}</span>
</div>
);
};
const checkAutorange = () => {
if (autorange) {
const minval = multithumb ? Math.min(lastVal, lastEndVal) : lastVal;
const maxval = multithumb ? Math.max(lastVal, lastEndVal) : lastVal;
const autosize = Math.max(autorangeMinSize ?? 0, autorange ?? maxval - minval) / 2;
if (Math.abs((minval - min) / (max - min)) < 0.15 || Math.abs((max - maxval) / (max - min)) < 0.15 || (multithumb && maxval - minval < (max - min) / 5 && autosize < max - min)) {
const newminval = autorangeMinVal !== undefined && minval - autosize < autorangeMinVal ? autorangeMinVal : minval - autosize;
setMin(newminval);
setMax(newminval !== minval ? Math.max(maxval + autosize, newminval + autosize) : maxval + autosize);
}
}
};
const valSlider = (which: string, val: number, onchange: (val: number) => void, setFinal: () => void) => {
const valPointerup = () => {
document.removeEventListener('pointerup', valPointerup, true);
setFinal();
checkAutorange();
};
return (
<div key={which} className={`range-slider ${size}`}>
{getValueLabel(val)}
<input
className={`rs-range ${size}`}
type="range"
color={color}
min={min}
max={max}
step={step}
value={val}
onPointerDown={() => document.addEventListener('pointerup', valPointerup, true)}
onChange={e => {
onchange(+e.target.value);
e.stopPropagation();
}}
/>
</div>
);
};
const onchange = (val: number) => {
// eslint-disable-next-line no-param-reassign
if (autorangeMinVal && val < autorangeMinVal) val = autorangeMinVal;
setNumber?.((lastVal = Math.min(multithumb ? endNumber - (minDiff ?? 0) : Number.MAX_VALUE, val)));
setNumberLoc((lastVal = Math.min(multithumb ? endNumber - (minDiff ?? 0) : Number.MAX_VALUE, val)));
};
const onendchange = (val: number) => {
setEndNumber?.((lastEndVal = Math.max(number + (minDiff ?? 0), val)));
setEndNumberLoc((lastEndVal = Math.max(number + (minDiff ?? 0), val)));
};
const Slider: (JSX.Element | null)[] = [!multithumb ? null : valSlider('end', endNumberLoc, onendchange, () => setFinalEndNumber?.(lastEndVal)), valSlider('start', valLoc, onchange, () => setFinalNumber?.(lastVal))];
const slider: JSX.Element = (
<div
className={`slider-wrapper`}
onPointerEnter={() => {
lastVal = valLoc;
lastEndVal = endNumberLoc;
}}
style={{
padding: `5px 0px ${getHeight(+(height || 0), size)}px 0px`,
width: fillWidth ? '100%' : 'fit-content',
}}>
<div
className="slider-container"
ref={r => {
r && new ResizeObserver(() => setWidth(+(r?.clientWidth ?? 100))).observe(r);
setWidth(+(r?.clientWidth ?? 100));
}}
style={{ height: getHeight(+(height || 0), size) }}
onPointerDown={onPointerDown}>
{Slider}
<div
className="selected-range"
style={{
height: getHeight(+(height || 0), size) / 10,
background: multithumb ? Colors.LIGHT_GRAY : color,
}}
/>
<div
className="range"
style={{
height: getHeight(+(height || 0), size) / 10,
width: getLeftPos(endNumber) - getLeftPos(number),
left: getLeftPos(number) + getHeight(+(height || 0), size),
display: multithumb ? undefined : 'none',
background: color,
}}
/>
<div className="box-minmax" style={{ fontSize: getFontSize(size), color }}>
<span>
{toDecimal(min)}
{unit}
</span>
<span>
{toDecimal(max)}
{unit}
</span>
</div>
</div>
</div>
);
return formLabel ? (
<div className={`form-wrapper ${formLabelPlacement}`}>
<div className={'formLabel'} style={{ fontSize: getFormLabelSize(size) }}>
{formLabel}
</div>
{slider}
</div>
) : (
slider
);
};
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