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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 | 3x 3x 3x 3x 3x 150x 3x 150x 150x 150x 150x 150x 150x 2875x 2875x 2875x 3x | import React, { useCallback, useMemo, useRef } from "react";
import styled from "styled-components";
type ColorSliderProps = {
value: number;
steps: number;
colorAtValue: (value: number) => string;
onChange: (value: number) => void;
};
const Wrapper = styled.div`
display: flex;
position: relative;
`;
const Color = styled.div`
flex-grow: 1;
max-width: 32px;
height: 28px;
border: 1px solid transparent;
box-sizing: border-box;
&:first-of-type {
border-top-left-radius: 4px;
border-bottom-left-radius: 4px;
min-width: 5px;
flex-shrink: 0;
}
&:nth-last-of-type(2) {
border-top-right-radius: 4px;
border-bottom-right-radius: 4px;
min-width: 5px;
flex-shrink: 0;
}
`;
const Handle = styled.div`
position: absolute;
width: 10px;
margin-left: -5px;
margin-top: -3px;
height: 100%;
border-radius: 4px;
padding: 2px;
box-shadow: 0px 1px 3px 1px rgba(0, 0, 0, 0.3);
border: 1px solid ${(props) => props.theme.colors.input.background};
`;
const ColorSlider = ({
value,
onChange,
steps,
colorAtValue,
}: ColorSliderProps) => {
const boundingRect = useRef<DOMRect | undefined>(undefined);
const stepValues = useMemo(() => Array.from(Array(steps).keys()), [steps]);
const onMouseMove = useCallback(
(e: MouseEvent) => {
if (boundingRect.current) {
const x = e.clientX - boundingRect.current.left;
const value = x / boundingRect.current.width;
onChange(value);
}
},
[onChange],
);
const onMouseUp = useCallback(
(_e: MouseEvent) => {
window.removeEventListener("mousemove", onMouseMove);
window.removeEventListener("mouseup", onMouseUp);
},
[onMouseMove],
);
const onMouseDown = useCallback(
(e: React.MouseEvent<HTMLDivElement, MouseEvent>) => {
if (!(e.currentTarget instanceof HTMLElement)) {
return;
}
boundingRect.current = e.currentTarget.getBoundingClientRect();
const x = e.clientX - boundingRect.current.left;
const value = x / boundingRect.current.width;
onChange(value);
window.addEventListener("mousemove", onMouseMove);
window.addEventListener("mouseup", onMouseUp);
},
[onChange, onMouseMove, onMouseUp],
);
return (
<Wrapper onMouseDown={onMouseDown}>
{stepValues.map((stepIndex) => {
const normalisedValue = stepIndex / (stepValues.length - 1);
const color = colorAtValue(normalisedValue);
return (
<Color
key={stepIndex}
style={{
backgroundColor: color,
}}
/>
);
})}
<Handle
style={{
left: `${value * 100}%`,
backgroundColor: colorAtValue(value),
}}
/>
</Wrapper>
);
};
export default ColorSlider;
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