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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 | 3x 3x 5x 5x 3x 5x 5x 5x 5x 3x 2x 5x 5x 5x 5x 5x 3x | import React, { useCallback } from 'react';
import { HsvaColor, hsvaToHslaString } from '@uiw/color-convert';
import Interactive, { type Interaction } from '@uiw/react-drag-event-interactive';
import { Pointer, type PointerProps } from './Pointer';
import type * as CSS from 'csstype';
export * from './Pointer';
export interface AlphaProps extends Omit<React.HTMLAttributes<HTMLDivElement>, 'onChange'> {
prefixCls?: string;
/** String, Pixel value for picker width. Default `316px` */
width?: CSS.Properties<string | number>['width'];
/** String, Pixel value for picker height. Default `16px` */
height?: CSS.Properties<string | number>['height'];
/** hsva => `{ h: 0, s: 75, v: 82, a: 1 }` */
hsva: HsvaColor;
/** React Component, Custom pointer component */
pointer?: (props: PointerProps) => JSX.Element;
/** Set rounded corners. */
radius?: CSS.Properties<string | number>['borderRadius'];
/** Set the background color. */
background?: string;
/** Set the background element props. */
bgProps?: React.HTMLAttributes<HTMLDivElement>;
/** Set the interactive element props. */
innerProps?: React.HTMLAttributes<HTMLDivElement>;
pointerProps?: PointerProps;
/** String Enum, horizontal or vertical. Default `horizontal` */
direction?: 'vertical' | 'horizontal';
onChange?: (newAlpha: { a: number }, offset: Interaction) => void;
}
export const BACKGROUND_IMG =
'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAMUlEQVQ4T2NkYGAQYcAP3uCTZhw1gGGYhAGBZIA/nYDCgBDAm9BGDWAAJyRCgLaBCAAgXwixzAS0pgAAAABJRU5ErkJggg==';
const Alpha = React.forwardRef<HTMLDivElement, AlphaProps>((props, ref) => {
const {
prefixCls = 'w-color-alpha',
className,
hsva,
background,
bgProps = {},
innerProps = {},
pointerProps = {},
radius = 0,
width,
height = 16,
direction = 'horizontal',
style,
onChange,
pointer,
...other
} = props;
const handleChange = (offset: Interaction) => {
onChange && onChange({ ...hsva, a: direction === 'horizontal' ? offset.left : offset.top }, offset);
};
const colorTo = hsvaToHslaString(Object.assign({}, hsva, { a: 1 }));
const innerBackground = `linear-gradient(to ${
direction === 'horizontal' ? 'right' : 'bottom'
}, rgba(244, 67, 54, 0) 0%, ${colorTo} 100%)`;
const comProps: { left?: string; top?: string } = {};
if (direction === 'horizontal') {
comProps.left = `${hsva.a * 100}%`;
} else {
comProps.top = `${hsva.a * 100}%`;
}
const styleWrapper: CSS.Properties<string | number> = {
'--alpha-background-color': '#fff',
'--alpha-pointer-background-color': 'rgb(248, 248, 248)',
'--alpha-pointer-box-shadow': 'rgb(0 0 0 / 37%) 0px 1px 4px 0px',
borderRadius: radius,
background: `url(${BACKGROUND_IMG}) left center`,
backgroundColor: 'var(--alpha-background-color)',
...{ width, height },
...style,
position: 'relative',
} as CSS.Properties<string | number>;
const handleKeyDown = useCallback(
(event: React.KeyboardEvent<HTMLDivElement>) => {
const step = 0.01; // 1% step
const currentAlpha = hsva.a;
let newAlpha = currentAlpha;
switch (event.key) {
case 'ArrowLeft':
if (direction === 'horizontal') {
newAlpha = Math.max(0, currentAlpha - step);
event.preventDefault();
}
break;
case 'ArrowRight':
if (direction === 'horizontal') {
newAlpha = Math.min(1, currentAlpha + step);
event.preventDefault();
}
break;
case 'ArrowUp':
if (direction === 'vertical') {
newAlpha = Math.max(0, currentAlpha - step);
event.preventDefault();
}
break;
case 'ArrowDown':
if (direction === 'vertical') {
newAlpha = Math.min(1, currentAlpha + step);
event.preventDefault();
}
break;
default:
return;
}
if (newAlpha !== currentAlpha) {
const syntheticOffset: Interaction = {
left: direction === 'horizontal' ? newAlpha : hsva.a,
top: direction === 'vertical' ? newAlpha : hsva.a,
width: 0,
height: 0,
x: 0,
y: 0,
};
onChange && onChange({ ...hsva, a: newAlpha }, syntheticOffset);
}
},
[hsva, direction, onChange],
);
const handleClick = useCallback((event: React.MouseEvent<HTMLDivElement, MouseEvent>) => {
(event.target as HTMLElement).focus();
}, []);
const pointerElement =
pointer && typeof pointer === 'function' ? (
pointer({ prefixCls, ...pointerProps, ...comProps })
) : (
<Pointer {...pointerProps} prefixCls={prefixCls} {...comProps} />
);
return (
<div
{...other}
className={[prefixCls, `${prefixCls}-${direction}`, className || ''].filter(Boolean).join(' ')}
style={styleWrapper}
ref={ref}
>
<div
{...bgProps}
style={{
inset: 0,
position: 'absolute',
background: background || innerBackground,
borderRadius: radius,
...bgProps.style,
}}
/>
<Interactive
{...innerProps}
style={{
...innerProps.style,
inset: 0,
zIndex: 1,
position: 'absolute',
outline: 'none',
}}
onMove={handleChange}
onDown={handleChange}
onClick={handleClick}
onKeyDown={handleKeyDown}
>
{pointerElement}
</Interactive>
</div>
);
});
Alpha.displayName = 'Alpha';
export default Alpha;
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