forked from AkkomaGang/akkoma-fe
initial contrast display support
This commit is contained in:
Henry Jameson
parent
4d77b0c86b
commit
87e98772b0
64
src/components/contrast_ratio/contrast_ratio.vue
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64
src/components/contrast_ratio/contrast_ratio.vue
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@ -0,0 +1,64 @@
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<template>
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<div class="contrast-ratio">
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<span class="label">
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Contrast:
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</span>
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<span>
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<span>
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{{contrast.text}}
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</span>
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<span class="rating">
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<span v-if="contrast.aaa">
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AAA
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</span>
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<span v-if="!contrast.aaa && contrast.aa">
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AA
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</span>
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<span v-if="!contrast.aaa && !contrast.aa">
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bad
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</span>
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</span>
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</span>
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<span v-if="large">
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<span>
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18pt+:
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</span>
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<span class="rating">
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<span v-if="contrast.aaa">
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AAA
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</span>
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<span v-if="!contrast.aaa && contrast.aa">
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AA
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</span>
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<span v-if="!contrast.aaa && !contrast.aa">
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bad
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</span>
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</span>
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</span>
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</div>
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</template>
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<script>
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export default {
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props: [
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'large', 'contrast'
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]
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}
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</script>
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<style lang="scss">
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.contrast-ratio {
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display: flex;
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justify-content: end;
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.label {
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margin-right: 1em;
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}
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.rating {
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display: inline-block;
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min-width: 3em;
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text-align: center;
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}
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}
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</style>
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@ -1,5 +1,6 @@
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import { rgb2hex } from '../../services/color_convert/color_convert.js'
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import { rgb2hex, hex2rgb, getContrastRatio } from '../../services/color_convert/color_convert.js'
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import ColorInput from '../color_input/color_input.vue'
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import ContrastRatio from '../contrast_ratio/contrast_ratio.vue'
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import OpacityInput from '../opacity_input/opacity_input.vue'
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import StyleSetter from '../../services/style_setter/style_setter.js'
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@ -127,7 +128,7 @@ export default {
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avatarAltRadius: this.avatarAltRadiusLocal,
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tooltipRadius: this.tooltipRadiusLocal,
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attachmentRadius: this.attachmentRadiusLocal
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}
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},
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}
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},
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preview () {
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@ -143,9 +144,36 @@ export default {
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}
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},
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previewTheme () {
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if (!this.preview.theme) return { colors: {}, opacity: {}, radii: {} }
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if (!this.preview.theme) return { colors: {}, opacity: {}, radii: {}, contrast: {} }
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return this.preview.theme
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},
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previewContrast () {
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if (!this.previewTheme.colors) return {}
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const colors = this.previewTheme.colors
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const hints = (ratio) => ({
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text: ratio.toPrecision(3) + ':1',
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// AA level, AAA level
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aa: ratio >= 4.5,
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aaa: ratio >= 7,
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// same but for 18pt+ texts
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laa: ratio >= 3,
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laaa: ratio >= 4.5
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})
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const ratios = {
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bgText: getContrastRatio(hex2rgb(colors.bg), hex2rgb(colors.text)),
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bgLink: getContrastRatio(hex2rgb(colors.bg), hex2rgb(colors.link)),
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panelText: getContrastRatio(hex2rgb(colors.panel), hex2rgb(colors.panelText)),
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btnText: getContrastRatio(hex2rgb(colors.btn), hex2rgb(colors.btnText)),
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topBarText: getContrastRatio(hex2rgb(colors.topBar), hex2rgb(colors.topBarText)),
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topBarLink: getContrastRatio(hex2rgb(colors.topBar), hex2rgb(colors.topBarLink)),
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}
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return Object.entries(ratios).reduce((acc, [k, v]) => { acc[k] = hints(v); return acc }, {})
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},
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previewRules () {
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if (!this.preview.colorRules) return ''
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return [this.preview.colorRules, this.preview.radiiRules, 'color: var(--text)'].join(';')
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@ -153,7 +181,8 @@ export default {
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},
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components: {
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ColorInput,
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OpacityInput
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OpacityInput,
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ContrastRatio
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},
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methods: {
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exportCurrentTheme () {
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@ -53,7 +53,9 @@
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<ColorInput name="bgColor" v-model="bgColorLocal" :label="$t('settings.background')"/>
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<OpacityInput name="bgOpacity" v-model="bgOpacityLocal" :fallback="previewTheme.opacity.bg || 1"/>
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<ColorInput name="textColor" v-model="textColorLocal" :label="$t('settings.text')"/>
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<ContrastRatio :contrast="previewContrast.bgText"/>
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<ColorInput name="linkColor" v-model="linkColorLocal" :label="$t('settings.links')"/>
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<ContrastRatio :contrast="previewContrast.bgLink"/>
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</div>
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<div class="color-item">
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<ColorInput name="fgColor" v-model="fgColorLocal" :label="$t('settings.foreground')"/>
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@ -81,13 +83,16 @@
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<ColorInput name="panelColor" v-model="panelColorLocal" :fallback="fgColorLocal" :label="$t('settings.background')"/>
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<OpacityInput name="panelOpacity" v-model="panelOpacityLocal" :fallback="previewTheme.opacity.panel || 1"/>
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<ColorInput name="panelTextColor" v-model="panelTextColorLocal" :fallback="previewTheme.colors.panelText" :label="$t('settings.links')"/>
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<ContrastRatio :contrast="previewContrast.panelText" large="1"/>
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<ColorInput name="panelFaintColor" v-model="panelFaintColorLocal" :fallback="previewTheme.colors.panelFaint" :label="$t('settings.faint')"/>
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</div>
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<div class="color-item">
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<h4>Top bar</h4>
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<ColorInput name="topBarColor" v-model="topBarColorLocal" :fallback="fgColorLocal" :label="$t('settings.background')"/>
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<ColorInput name="topBarTextColor" v-model="topBarTextColorLocal" :fallback="previewTheme.colors.topBarText" :label="$t('settings.text')"/>
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<ContrastRatio :contrast="previewContrast.topBarText"/>
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<ColorInput name="topBarLinkColor" v-model="topBarLinkColorLocal" :fallback="previewTheme.colors.topBarLink" :label="$t('settings.links')"/>
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<ContrastRatio :contrast="previewContrast.topBarLink"/>
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</div>
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<div class="color-item">
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<h4>Inputs</h4>
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@ -100,6 +105,7 @@
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<ColorInput name="btnColor" v-model="btnColorLocal" :fallback="fgColorLocal" :label="$t('settings.background')"/>
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<OpacityInput name="btnOpacity" v-model="btnOpacityLocal" :fallback="previewTheme.opacity.btn || 1"/>
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<ColorInput name="btnTextColor" v-model="btnTextColorLocal" :fallback="previewTheme.colors.btnText" :label="$t('settings.text')"/>
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<ContrastRatio :contrast="previewContrast.btnText"/>
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</div>
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<div class="color-item">
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<h4>Borders</h4>
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@ -19,6 +19,42 @@ const rgb2hex = (r, g, b) => {
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return `#${((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1)}`
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}
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// https://www.w3.org/TR/2008/REC-WCAG20-20081211/#relativeluminancedef
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// https://www.w3.org/TR/2008/REC-WCAG20-20081211/relative-luminance.xml
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// https://en.wikipedia.org/wiki/SRGB#The_reverse_transformation
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const c2linear = (b) => {
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// W3C gives 0.03928 while wikipedia states 0.04045
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// what those magical numbers mean - I don't know.
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// something about gamma-correction, i suppose.
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// Sticking with W3C example.
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const c = b / 255
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if (c < 0.03928) {
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return c / 12.92
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} else {
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return Math.pow((c + 0.055) / 1.055, 2.4)
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}
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}
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const srgbToLinear = (srgb) => {
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return 'rgb'.split('').reduce((acc, c) => { acc[c] = c2linear(srgb[c]); return acc }, {})
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}
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// https://www.w3.org/TR/2008/REC-WCAG20-20081211/#relativeluminancedef
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// https://www.w3.org/TR/2008/REC-WCAG20-20081211/relative-luminance.xml
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const relativeLuminance = (srgb) => {
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const {r, g, b} = srgbToLinear(srgb)
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return 0.2126 * r + 0.7152 * g + 0.0722 * b
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}
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// https://www.w3.org/TR/2008/REC-WCAG20-20081211/#contrast-ratiodef
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const getContrastRatio = (a, b) => {
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const la = relativeLuminance(a)
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const lb = relativeLuminance(b)
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const [l1, l2] = la > lb ? [la, lb] : [lb, la]
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return (l1 + 0.05) / (l2 + 0.05)
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}
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const hex2rgb = (hex) => {
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const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex)
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return result ? {
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@ -47,5 +83,6 @@ export {
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rgb2hex,
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hex2rgb,
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mixrgb,
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rgbstr2hex
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rgbstr2hex,
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getContrastRatio
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}
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