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Code Issues Releases Activity

fix: Shopping List Label Text Color (#4302)

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Michael Genson 2024-10-01 10:47:51 -05:00 • committed by GitHub
parent f1d56cad9c
commit 3d1b08779b
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3 changed files with 52 additions and 41 deletions
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39
frontend/composables/use-text-color.ts Normal file
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// @ts-ignore missing color types
import Color from "@sphinxxxx/color-conversion";
const LIGHT_COLOR = "white";
const DARK_COLOR = "black";
const ACCESSIBILITY_THRESHOLD = 0.179;
/*
Function to pick the text color based on the background color.
Based on -> https://stackoverflow.com/questions/3942878/how-to-decide-font-color-in-white-or-black-depending-on-background-color
*/
export function getTextColor(bgColor: string | undefined): string {
if (!bgColor) {
return DARK_COLOR;
}
try {
const color = new Color(bgColor);
// if opacity is less than 0.3 always return dark color
if (color._rgba[3] < 0.3) {
return DARK_COLOR;
}
const uicolors = [color._rgba[0] / 255, color._rgba[1] / 255, color._rgba[2] / 255];
const c = uicolors.map((col) => {
if (col <= 0.03928) {
return col / 12.92;
}
return Math.pow((col + 0.055) / 1.055, 2.4);
});
const L = 0.2126 * c[0] + 0.7152 * c[1] + 0.0722 * c[2];
return L > ACCESSIBILITY_THRESHOLD ? DARK_COLOR : LIGHT_COLOR;
} catch (error) {
console.warn(error);
return DARK_COLOR;
}
}