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Fix and rewrite contrast color calculation, fix project-related bugs (#30237)

Browse Source 
1. The previous color contrast calculation function was incorrect at
least for the `#84b6eb` where it output low-contrast white instead of
black. I've rewritten these functions now to accept hex colors and to
match GitHub's calculation and to output pure white/black for maximum
contrast. Before and after:
<img width="94" alt="Screenshot 2024-04-02 at 01 53 46"
src="https://github.com/go-gitea/gitea/assets/115237/00b39e15-a377-4458-95cf-ceec74b78228"><img
width="90" alt="Screenshot 2024-04-02 at 01 51 30"
src="https://github.com/go-gitea/gitea/assets/115237/1677067a-8d8f-47eb-82c0-76330deeb775">

2. Fix project-related issues:

- Expose the new `ContrastColor` function as template helper and use it
for project cards, replacing the previous JS solution which eliminates a
flash of wrong color on page load.
- Fix a bug where if editing a project title, the counter would get
lost.
- Move `rgbToHex` function to color utils.

@HesterG fyi

---------

Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: Giteabot <teabot@gitea.io>
This commit is contained in:
silverwind
2024-04-07 18:19:25 +02:00
committed by GitHub
parent 019857a701
commit 36887ed392
14 changed files with 135 additions and 191 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
web_src/js/components/ContextPopup.vue
View File

@@ -1,7 +1,6 @@
<script>
import {SvgIcon} from '../svg.js';
import {useLightTextOnBackground} from '../utils/color.js';
import tinycolor from 'tinycolor2';
import {contrastColor} from '../utils/color.js';
import {GET} from '../modules/fetch.js';
const {appSubUrl, i18n} = window.config;
@@ -59,16 +58,11 @@ export default {
},
labels() {
return this.issue.labels.map((label) => {
let textColor;
const {r, g, b} = tinycolor(label.color).toRgb();
if (useLightTextOnBackground(r, g, b)) {
textColor = '#eeeeee';
} else {
textColor = '#111111';
}
return {name: label.name, color: `#${label.color}`, textColor};
});
return this.issue.labels.map((label) => ({
name: label.name,
color: `#${label.color}`,
textColor: contrastColor(`#${label.color}`),
}));
},
},
mounted() {
@@ -108,7 +102,7 @@ export default {
<p><small>{{ issue.repository.full_name }} on {{ createdAt }}</small></p>
<p><svg-icon :name="icon" :class="['text', color]"/> <strong>{{ issue.title }}</strong> #{{ issue.number }}</p>
<p>{{ body }}</p>
<div>
<div class="labels-list">
<div
v-for="label in labels"
:key="label.name"

61
web_src/js/features/repo-projects.js
View File

@@ -1,8 +1,8 @@
import $ from 'jquery';
import {useLightTextOnBackground} from '../utils/color.js';
import tinycolor from 'tinycolor2';
import {contrastColor} from '../utils/color.js';
import {createSortable} from '../modules/sortable.js';
import {POST, DELETE, PUT} from '../modules/fetch.js';
import tinycolor from 'tinycolor2';
function updateIssueCount(cards) {
const parent = cards.parentElement;
@@ -65,14 +65,11 @@ async function initRepoProjectSortable() {
boardColumns = mainBoard.getElementsByClassName('project-column');
for (let i = 0; i < boardColumns.length; i++) {
const column = boardColumns[i];
if (parseInt($(column).data('sorting')) !== i) {
if (parseInt(column.getAttribute('data-sorting')) !== i) {
try {
await PUT($(column).data('url'), {
data: {
sorting: i,
color: rgbToHex(window.getComputedStyle($(column)[0]).backgroundColor),
},
});
const bgColor = column.style.backgroundColor; // will be rgb() string
const color = bgColor ? tinycolor(bgColor).toHexString() : '';
await PUT(column.getAttribute('data-url'), {data: {sorting: i, color}});
} catch (error) {
console.error(error);
}
@@ -102,16 +99,10 @@ export function initRepoProject() {
for (const modal of document.getElementsByClassName('edit-project-column-modal')) {
const projectHeader = modal.closest('.project-column-header');
const projectTitleLabel = projectHeader?.querySelector('.project-column-title');
const projectTitleLabel = projectHeader?.querySelector('.project-column-title-label');
const projectTitleInput = modal.querySelector('.project-column-title-input');
const projectColorInput = modal.querySelector('#new_project_column_color');
const boardColumn = modal.closest('.project-column');
const bgColor = boardColumn?.style.backgroundColor;
if (bgColor) {
setLabelColor(projectHeader, rgbToHex(bgColor));
}
modal.querySelector('.edit-project-column-button')?.addEventListener('click', async function (e) {
e.preventDefault();
try {
@@ -126,10 +117,21 @@ export function initRepoProject() {
} finally {
projectTitleLabel.textContent = projectTitleInput?.value;
projectTitleInput.closest('form')?.classList.remove('dirty');
if (projectColorInput?.value) {
setLabelColor(projectHeader, projectColorInput.value);
const dividers = boardColumn.querySelectorAll(':scope > .divider');
if (projectColorInput.value) {
const color = contrastColor(projectColorInput.value);
boardColumn.style.setProperty('background', projectColorInput.value, 'important');
boardColumn.style.setProperty('color', color, 'important');
for (const divider of dividers) {
divider.style.setProperty('color', color);
}
} else {
boardColumn.style.removeProperty('background');
boardColumn.style.removeProperty('color');
for (const divider of dividers) {
divider.style.removeProperty('color');
}
}
boardColumn.style = `background: ${projectColorInput.value} !important`;
$('.ui.modal').modal('hide');
}
});
@@ -182,24 +184,3 @@ export function initRepoProject() {
createNewColumn(url, $columnTitle, $projectColorInput);
});
}
function setLabelColor(label, color) {
const {r, g, b} = tinycolor(color).toRgb();
if (useLightTextOnBackground(r, g, b)) {
label.classList.remove('dark-label');
label.classList.add('light-label');
} else {
label.classList.remove('light-label');
label.classList.add('dark-label');
}
}
function rgbToHex(rgb) {
rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+).*\)$/);
return `#${hex(rgb[1])}${hex(rgb[2])}${hex(rgb[3])}`;
}
function hex(x) {
const hexDigits = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'];
return Number.isNaN(x) ? '00' : hexDigits[(x - x % 16) / 16] + hexDigits[x % 16];
}

30
web_src/js/utils/color.js
View File

@@ -1,23 +1,21 @@
// Check similar implementation in modules/util/color.go and keep synchronization
// Return R, G, B values defined in reletive luminance
function getLuminanceRGB(channel) {
const sRGB = channel / 255;
return (sRGB <= 0.03928) ? sRGB / 12.92 : ((sRGB + 0.055) / 1.055) ** 2.4;
import tinycolor from 'tinycolor2';
// Returns relative luminance for a SRGB color - https://en.wikipedia.org/wiki/Relative_luminance
// Keep this in sync with modules/util/color.go
function getRelativeLuminance(color) {
const {r, g, b} = tinycolor(color).toRgb();
return (0.2126729 * r + 0.7151522 * g + 0.072175 * b) / 255;
}
// Reference from: https://www.w3.org/WAI/GL/wiki/Relative_luminance
function getLuminance(r, g, b) {
const R = getLuminanceRGB(r);
const G = getLuminanceRGB(g);
const B = getLuminanceRGB(b);
return 0.2126 * R + 0.7152 * G + 0.0722 * B;
function useLightText(backgroundColor) {
return getRelativeLuminance(backgroundColor) < 0.453;
}
// Reference from: https://firsching.ch/github_labels.html
// In the future WCAG 3 APCA may be a better solution.
// Check if text should use light color based on RGB of background
export function useLightTextOnBackground(r, g, b) {
return getLuminance(r, g, b) < 0.453;
// Given a background color, returns a black or white foreground color that the highest
// contrast ratio. In the future, the APCA contrast function, or CSS `contrast-color` will be better.
// https://github.com/color-js/color.js/blob/eb7b53f7a13bb716ec8b28c7a56f052cd599acd9/src/contrast/APCA.js#L42
export function contrastColor(backgroundColor) {
return useLightText(backgroundColor) ? '#fff' : '#000';
}
function resolveColors(obj) {

39
web_src/js/utils/color.test.js
View File

@@ -1,21 +1,22 @@
import {useLightTextOnBackground} from './color.js';
import {contrastColor} from './color.js';
test('useLightTextOnBackground', () => {
expect(useLightTextOnBackground(215, 58, 74)).toBe(true);
expect(useLightTextOnBackground(0, 117, 202)).toBe(true);
expect(useLightTextOnBackground(207, 211, 215)).toBe(false);
expect(useLightTextOnBackground(162, 238, 239)).toBe(false);
expect(useLightTextOnBackground(112, 87, 255)).toBe(true);
expect(useLightTextOnBackground(0, 134, 114)).toBe(true);
expect(useLightTextOnBackground(228, 230, 105)).toBe(false);
expect(useLightTextOnBackground(216, 118, 227)).toBe(true);
expect(useLightTextOnBackground(255, 255, 255)).toBe(false);
expect(useLightTextOnBackground(43, 134, 133)).toBe(true);
expect(useLightTextOnBackground(43, 135, 134)).toBe(true);
expect(useLightTextOnBackground(44, 135, 134)).toBe(true);
expect(useLightTextOnBackground(59, 182, 179)).toBe(true);
expect(useLightTextOnBackground(124, 114, 104)).toBe(true);
expect(useLightTextOnBackground(126, 113, 108)).toBe(true);
expect(useLightTextOnBackground(129, 112, 109)).toBe(true);
expect(useLightTextOnBackground(128, 112, 112)).toBe(true);
test('contrastColor', () => {
expect(contrastColor('#d73a4a')).toBe('#fff');
expect(contrastColor('#0075ca')).toBe('#fff');
expect(contrastColor('#cfd3d7')).toBe('#000');
expect(contrastColor('#a2eeef')).toBe('#000');
expect(contrastColor('#7057ff')).toBe('#fff');
expect(contrastColor('#008672')).toBe('#fff');
expect(contrastColor('#e4e669')).toBe('#000');
expect(contrastColor('#d876e3')).toBe('#000');
expect(contrastColor('#ffffff')).toBe('#000');
expect(contrastColor('#2b8684')).toBe('#fff');
expect(contrastColor('#2b8786')).toBe('#fff');
expect(contrastColor('#2c8786')).toBe('#000');
expect(contrastColor('#3bb6b3')).toBe('#000');
expect(contrastColor('#7c7268')).toBe('#fff');
expect(contrastColor('#7e716c')).toBe('#fff');
expect(contrastColor('#81706d')).toBe('#fff');
expect(contrastColor('#807070')).toBe('#fff');
expect(contrastColor('#84b6eb')).toBe('#000');
});