Chamilo is a learning management system focused on ease of use and accessibility
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chamilo-lms/assets/vue/composables/theme.js

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import { onMounted, ref, watch } from "vue"
import Color from "colorjs.io"
import { usePlatformConfig } from "../store/platformConfig"
export const useTheme = () => {
let colors = {}
onMounted(() => {
// getCssVariableValue return empty if called too early, refresh colors when html is mounted
// to ensure all values are set correctly
for (const [key, value] of Object.entries(colors)) {
value.value = getCssVariableValue(key)
}
})
const getColorTheme = (variableName) => {
if (Object.hasOwn(colors, variableName)) {
return colors[variableName]
}
const colorRef = ref(getCssVariableValue(variableName))
watch(colorRef, (newColor) => {
setCssVariableValue(variableName, newColor)
})
colors[variableName] = colorRef
return colorRef
}
const getCssVariableValue = (variableName) => {
const colorVariable = getComputedStyle(document.body).getPropertyValue(variableName)
return colorFromCSSVariable(colorVariable)
}
const setCssVariableValue = (variableName, color) => {
document.documentElement.style.setProperty(variableName, colorToCSSVariable(color))
}
const getColors = () => {
let colorsPlainObject = {}
for (const [key, value] of Object.entries(colors)) {
colorsPlainObject[key] = colorToCSSVariable(value.value)
}
return colorsPlainObject
}
const setColors = (colorsObj) => {
for (const key in colorsObj) {
if (colors[key] === undefined || colors[key] === null) {
console.error(`Color with key ${key} is on color set`)
continue
}
colors[key].value = colorFromCSSVariable(colorsObj[key])
}
}
const colorToCSSVariable = (color) => {
// according to documentation https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/rgb#syntax
// the format "r g b" should work but because how rules in css are defined does not
// so, we need the format "r, g, b" for variables,
const r = Math.round(color.r * 255)
const g = Math.round(color.g * 255)
const b = Math.round(color.b * 255)
return `${r} ${g} ${b}`
}
const colorFromCSSVariable = (variable) => {
return new Color(`rgb(${variable})`)
}
return {
getColorTheme,
getColors,
setColors,
}
}
export function useVisualTheme() {
const platformConfigStore = usePlatformConfig()
const themeName = platformConfigStore.visualTheme
function getThemeAssetUrl(path) {
return `/themes/${platformConfigStore.visualTheme}/${path}`
}
return {
themeName,
getThemeAssetUrl,
}
}