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theme.js
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theme.js
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'use strict'
/* global localStorage */
/* global FileReader */
/* global DOMParser */
function Theme (client) {
this.el = document.createElement('style')
this.el.type = 'text/css'
this.active = {}
this.default = {
background: '#eeeeee',
f_high: '#0a0a0a',
f_med: '#4a4a4a',
f_low: '#6a6a6a',
f_inv: '#111111',
b_high: '#a1a1a1',
b_med: '#c1c1c1',
b_low: '#ffffff',
b_inv: '#ffb545'
}
// Callbacks
this.onLoad = () => {}
this.install = (host = document.body) => {
window.addEventListener('dragover', this.drag)
window.addEventListener('drop', this.drop)
host.appendChild(this.el)
}
this.start = () => {
console.log('Theme', 'Starting..')
if (isJson(localStorage.theme)) {
const storage = JSON.parse(localStorage.theme)
if (isValid(storage)) {
console.log('Theme', 'Loading theme in localStorage..')
this.load(storage)
return
}
}
this.load(this.default)
}
this.open = () => {
console.log('Theme', 'Open theme..')
const input = document.createElement('input')
input.type = 'file'
input.onchange = (e) => {
this.read(e.target.files[0], this.load)
}
input.click()
}
this.load = (data) => {
const theme = this.parse(data)
if (!isValid(theme)) { console.warn('Theme', 'Invalid format'); return }
console.log('Theme', 'Loaded theme!')
this.el.innerHTML = `:root {
--background: ${theme.background};
--f_high: ${theme.f_high};
--f_med: ${theme.f_med};
--f_low: ${theme.f_low};
--f_inv: ${theme.f_inv};
--b_high: ${theme.b_high};
--b_med: ${theme.b_med};
--b_low: ${theme.b_low};
--b_inv: ${theme.b_inv};
}`
localStorage.setItem('theme', JSON.stringify(theme))
this.active = theme
if (this.onLoad) {
this.onLoad(data)
}
}
this.reset = () => {
this.load(this.default)
}
this.set = (key, val) => {
if (!val) { return }
const hex = (`${val}`.substr(0, 1) !== '#' ? '#' : '') + `${val}`
if (!isColor(hex)) { console.warn('Theme', `${hex} is not a valid color.`); return }
this.active[key] = hex
}
this.get = (key) => {
return this.active[key]
}
this.parse = (any) => {
if (isValid(any)) { return any }
if (isJson(any)) { return JSON.parse(any) }
if (isHtml(any)) { return extract(any) }
}
// Drag
this.drag = (e) => {
e.stopPropagation()
e.preventDefault()
e.dataTransfer.dropEffect = 'copy'
}
this.drop = (e) => {
e.preventDefault()
const file = e.dataTransfer.files[0]
if (file.name.indexOf('.svg') > -1) {
this.read(file, this.load)
}
e.stopPropagation()
}
this.read = (file, callback) => {
const reader = new FileReader()
reader.onload = (event) => {
callback(event.target.result)
}
reader.readAsText(file, 'UTF-8')
}
// Helpers
function extract (xml) {
const svg = new DOMParser().parseFromString(xml, 'text/xml')
try {
return {
background: svg.getElementById('background').getAttribute('fill'),
f_high: svg.getElementById('f_high').getAttribute('fill'),
f_med: svg.getElementById('f_med').getAttribute('fill'),
f_low: svg.getElementById('f_low').getAttribute('fill'),
f_inv: svg.getElementById('f_inv').getAttribute('fill'),
b_high: svg.getElementById('b_high').getAttribute('fill'),
b_med: svg.getElementById('b_med').getAttribute('fill'),
b_low: svg.getElementById('b_low').getAttribute('fill'),
b_inv: svg.getElementById('b_inv').getAttribute('fill')
}
} catch (err) {
console.warn('Theme', 'Incomplete SVG Theme', err)
}
}
function isValid (json) {
if (!json) { return false }
if (!json.background || !isColor(json.background)) { return false }
if (!json.f_high || !isColor(json.f_high)) { return false }
if (!json.f_med || !isColor(json.f_med)) { return false }
if (!json.f_low || !isColor(json.f_low)) { return false }
if (!json.f_inv || !isColor(json.f_inv)) { return false }
if (!json.b_high || !isColor(json.b_high)) { return false }
if (!json.b_med || !isColor(json.b_med)) { return false }
if (!json.b_low || !isColor(json.b_low)) { return false }
if (!json.b_inv || !isColor(json.b_inv)) { return false }
return true
}
function isColor (hex) {
return /^#([0-9A-F]{3}){1,2}$/i.test(hex)
}
function isJson (text) {
try { JSON.parse(text); return true } catch (error) { return false }
}
function isHtml (text) {
try { new DOMParser().parseFromString(text, 'text/xml'); return true } catch (error) { return false }
}
}