fix(ui): improve color contrast of tags #12058
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| <!-- | ||
| - SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors | ||
| - SPDX-License-Identifier: AGPL-3.0-or-later | ||
| --> | ||
|
|
||
| <template> | ||
| <div class="tag-group" :class="{ 'tag-group--dark': isDark, 'tag-group--bright': !isDark }"> | ||
| <div | ||
| class="tag-group__bg" | ||
| :style="{ 'background-color': tag.color }" /> | ||
| <span | ||
| class="tag-group__label"> | ||
| {{ translateTagDisplayName(tag) }} | ||
| </span> | ||
| </div> | ||
| </template> | ||
|
|
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| <script setup> | ||
| import { defineProps } from 'vue' | ||
| import { translateTagDisplayName } from '../util/tag.js' | ||
|
|
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| const props = defineProps({ | ||
| tag: { | ||
| type: Object, | ||
| required: true, | ||
| }, | ||
| }) | ||
|
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||
| // Source - https://stackoverflow.com/a | ||
| // Posted by kirilloid, modified by community. See post 'Timeline' for change history | ||
| // Retrieved 2025-11-19, License - CC BY-SA 4.0 | ||
|
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| const RED = 0.2126; | ||
| const GREEN = 0.7152; | ||
| const BLUE = 0.0722; | ||
|
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| const GAMMA = 2.4; | ||
|
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| function luminance(r, g, b) { | ||
| const a = [r, g, b].map(function (v) { | ||
| v /= 255 | ||
| return v <= 0.03928 | ||
| ? v / 12.92 | ||
| : Math.pow((v + 0.055) / 1.055, GAMMA) | ||
| }) | ||
| return a[0] * RED + a[1] * GREEN + a[2] * BLUE | ||
| } | ||
|
|
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| function contrast(rgb1, rgb2) { | ||
| const lum1 = luminance(...rgb1) | ||
| const lum2 = luminance(...rgb2) | ||
| const brightest = Math.max(lum1, lum2) | ||
| const darkest = Math.min(lum1, lum2) | ||
| return (brightest + 0.05) / (darkest + 0.05) | ||
| } | ||
|
|
||
| const match = /^\#([\da-fA-F]{1,2})([\da-fA-F]{1,2})([\da-fA-F]{1,2})$/.exec(props.tag.color); | ||
|
Check failure on line 57 in src/components/Tag.vue
|
||
| if (!match) { | ||
| throw new Error('Could not parse tag colour: ' + props.tag.color) | ||
| } | ||
| const rgbColor = { | ||
| r: Number(match[1]), | ||
| g: Number(match[2]), | ||
| b: Number(match[3]), | ||
| } | ||
|
|
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| const contrastWithWhite = contrast([255, 255, 255], [rgbColor.r, rgbColor.g, rgbColor.b]); | ||
| const contrastWithBlack = contrast([0, 0, 0], [rgbColor.r, rgbColor.g, rgbColor.b]); | ||
|
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| const isDark = contrastWithBlack < contrastWithWhite | ||
| </script> | ||
|
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| <style scoped lang="scss"> | ||
| .tag-group { | ||
| display: inline-block; | ||
| border-radius: var(--border-radius-pill); | ||
| position: relative; | ||
| margin-inline-end: 1px; | ||
| overflow: hidden; | ||
| text-overflow: ellipsis; | ||
|
|
||
| &__label { | ||
| margin: 0 7px; | ||
| z-index: 2; | ||
| font-size: calc(var(--default-font-size) * 0.8); | ||
| font-weight: bold; | ||
| padding-inline: 2px; | ||
| white-space: nowrap; | ||
| filter: brightness(90%); | ||
| } | ||
| &--dark &__label { | ||
| color: white; | ||
| } | ||
| &--bright &__label { | ||
| color: black; | ||
| } | ||
|
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| &__bg { | ||
| position: absolute; | ||
| width: 100%; | ||
| height: 100%; | ||
| top: 0; | ||
| inset-inline-start: 0; | ||
| } | ||
| } | ||
| </style> | ||
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