753 lines
21 KiB
JavaScript
753 lines
21 KiB
JavaScript
import { convert, brightness, contrastRatio } from 'chromatism'
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import { rgb2hex, rgba2css, alphaBlendLayers, getTextColor, relativeLuminance, getCssColor } from '../color_convert/color_convert.js'
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import { LAYERS, DEFAULT_OPACITY, SLOT_INHERITANCE } from './pleromafe.js'
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/*
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* # What's all this?
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* Here be theme engine for pleromafe. All of this supposed to ease look
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* and feel customization, making widget styles and make developer's life
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* easier when it comes to supporting themes. Like many other theme systems
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* it operates on color definitions, or "slots" - for example you define
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* "button" color slot and then in UI component Button's CSS you refer to
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* it as a CSS3 Variable.
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*
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* Some applications allow you to customize colors for certain things.
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* Some UI toolkits allow you to define colors for each type of widget.
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* Most of them are pretty barebones and have no assistance for common
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* problems and cases, and in general themes themselves are very hard to
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* maintain in all aspects. This theme engine tries to solve all of the
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* common problems with themes.
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*
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* You don't have redefine several similar colors if you just want to
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* change one color - all color slots are derived from other ones, so you
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* can have at least one or two "basic" colors defined and have all other
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* components inherit and modify basic ones.
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*
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* You don't have to test contrast ratio for colors or pick text color for
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* each element even if you have light-on-dark elements in dark-on-light
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* theme.
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*
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* You don't have to maintain order of code for inheriting slots from othet
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* slots - dependency graph resolving does it for you.
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*/
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/* This indicates that this version of code outputs similar theme data and
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* should be incremented if output changes - for instance if getTextColor
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* function changes and older themes no longer render text colors as
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* author intended previously.
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*/
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export const CURRENT_VERSION = 3
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export const getLayersArray = (layer, data = LAYERS) => {
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const array = [layer]
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let parent = data[layer]
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while (parent) {
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array.unshift(parent)
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parent = data[parent]
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}
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return array
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}
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export const getLayers = (layer, variant = layer, opacitySlot, colors, opacity) => {
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return getLayersArray(layer).map((currentLayer) => ([
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currentLayer === layer
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? colors[variant]
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: colors[currentLayer],
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currentLayer === layer
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? opacity[opacitySlot] || 1
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: opacity[currentLayer]
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]))
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}
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const getDependencies = (key, inheritance) => {
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const data = inheritance[key]
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if (typeof data === 'string' && data.startsWith('--')) {
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return [data.substring(2)]
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} else {
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if (data === null) return []
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const { depends, layer, variant } = data
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const layerDeps = layer
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? getLayersArray(layer).map(currentLayer => {
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return currentLayer === layer
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? variant || layer
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: currentLayer
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})
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: []
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if (Array.isArray(depends)) {
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return [...depends, ...layerDeps]
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} else {
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return [...layerDeps]
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}
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}
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}
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/**
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* Sorts inheritance object topologically - dependant slots come after
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* dependencies
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*
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* @property {Object} inheritance - object defining the nodes
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* @property {Function} getDeps - function that returns dependencies for
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* given value and inheritance object.
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* @returns {String[]} keys of inheritance object, sorted in topological
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* order. Additionally, dependency-less nodes will always be first in line
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*/
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export const topoSort = (
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inheritance = SLOT_INHERITANCE,
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getDeps = getDependencies
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) => {
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// This is an implementation of https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm
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const allKeys = Object.keys(inheritance)
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const whites = new Set(allKeys)
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const grays = new Set()
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const blacks = new Set()
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const unprocessed = [...allKeys]
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const output = []
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const step = (node) => {
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if (whites.has(node)) {
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// Make node "gray"
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whites.delete(node)
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grays.add(node)
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// Do step for each node connected to it (one way)
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getDeps(node, inheritance).forEach(step)
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// Make node "black"
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grays.delete(node)
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blacks.add(node)
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// Put it into the output list
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output.push(node)
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} else if (grays.has(node)) {
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output.push(node)
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} else if (blacks.has(node)) {
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// do nothing
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} else {
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throw new Error('Unintended condition in topoSort!')
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}
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}
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while (unprocessed.length > 0) {
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step(unprocessed.pop())
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}
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// The index thing is to make sorting stable on browsers
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// where Array.sort() isn't stable
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return output.map((data, index) => ({ data, index })).sort(({ data: a, index: ai }, { data: b, index: bi }) => {
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const depsA = getDeps(a, inheritance).length
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const depsB = getDeps(b, inheritance).length
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if (depsA === depsB || (depsB !== 0 && depsA !== 0)) return ai - bi
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if (depsA === 0 && depsB !== 0) return -1
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if (depsB === 0 && depsA !== 0) return 1
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return 0 // failsafe, shouldn't happen?
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}).map(({ data }) => data)
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}
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const expandSlotValue = (value) => {
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if (typeof value === 'object') return value
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return {
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depends: value.startsWith('--') ? [value.substring(2)] : [],
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default: value.startsWith('#') ? value : undefined
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}
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}
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/**
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* retrieves opacity slot for given slot. This goes up the depenency graph
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* to find which parent has opacity slot defined for it.
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* TODO refactor this
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*/
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export const getOpacitySlot = (
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k,
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inheritance = SLOT_INHERITANCE,
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getDeps = getDependencies
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) => {
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const value = expandSlotValue(inheritance[k])
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if (value.opacity === null) return
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if (value.opacity) return value.opacity
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const findInheritedOpacity = (key, visited = [k]) => {
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const depSlot = getDeps(key, inheritance)[0]
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if (depSlot === undefined) return
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const dependency = inheritance[depSlot]
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if (dependency === undefined) return
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if (dependency.opacity || dependency === null) {
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return dependency.opacity
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} else if (dependency.depends && visited.includes(depSlot)) {
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return findInheritedOpacity(depSlot, [...visited, depSlot])
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} else {
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return null
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}
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}
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if (value.depends) {
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return findInheritedOpacity(k)
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}
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}
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/**
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* retrieves layer slot for given slot. This goes up the depenency graph
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* to find which parent has opacity slot defined for it.
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* this is basically copypaste of getOpacitySlot except it checks if key is
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* in LAYERS
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* TODO refactor this
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*/
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export const getLayerSlot = (
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k,
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inheritance = SLOT_INHERITANCE,
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getDeps = getDependencies
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) => {
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const value = expandSlotValue(inheritance[k])
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if (LAYERS[k]) return k
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if (value.layer === null) return
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if (value.layer) return value.layer
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const findInheritedLayer = (key, visited = [k]) => {
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const depSlot = getDeps(key, inheritance)[0]
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if (depSlot === undefined) return
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const dependency = inheritance[depSlot]
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if (dependency === undefined) return
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if (dependency.layer || dependency === null) {
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return dependency.layer
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} else if (dependency.depends) {
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return findInheritedLayer(dependency, [...visited, depSlot])
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} else {
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return null
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}
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}
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if (value.depends) {
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return findInheritedLayer(k)
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}
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}
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/**
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* topologically sorted SLOT_INHERITANCE
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*/
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export const SLOT_ORDERED = topoSort(
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Object.entries(SLOT_INHERITANCE)
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.sort(([aK, aV], [bK, bV]) => ((aV && aV.priority) || 0) - ((bV && bV.priority) || 0))
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.reduce((acc, [k, v]) => ({ ...acc, [k]: v }), {})
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)
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/**
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* All opacity slots used in color slots, their default values and affected
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* color slots.
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*/
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export const OPACITIES = Object.entries(SLOT_INHERITANCE).reduce((acc, [k, v]) => {
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const opacity = getOpacitySlot(k, SLOT_INHERITANCE, getDependencies)
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if (opacity) {
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return {
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...acc,
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[opacity]: {
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defaultValue: DEFAULT_OPACITY[opacity] || 1,
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affectedSlots: [...((acc[opacity] && acc[opacity].affectedSlots) || []), k]
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}
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}
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} else {
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return acc
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}
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}, {})
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/**
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* Handle dynamic color
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*/
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export const computeDynamicColor = (sourceColor, getColor, mod) => {
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if (typeof sourceColor !== 'string' || !sourceColor.startsWith('--')) return sourceColor
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let targetColor = null
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// Color references other color
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const [variable, modifier] = sourceColor.split(/,/g).map(str => str.trim())
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const variableSlot = variable.substring(2)
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targetColor = getColor(variableSlot)
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if (modifier) {
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targetColor = brightness(Number.parseFloat(modifier) * mod, targetColor).rgb
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}
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return targetColor
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}
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/**
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* THE function you want to use. Takes provided colors and opacities
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* value and uses inheritance data to figure out color needed for the slot.
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*/
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export const getColors = (sourceColors, sourceOpacity) => SLOT_ORDERED.reduce(({ colors, opacity }, key) => {
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const sourceColor = sourceColors[key]
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const value = expandSlotValue(SLOT_INHERITANCE[key])
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const deps = getDependencies(key, SLOT_INHERITANCE)
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const isTextColor = !!value.textColor
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const variant = value.variant || value.layer
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let backgroundColor = null
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if (isTextColor) {
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backgroundColor = alphaBlendLayers(
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{ ...(colors[deps[0]] || convert(sourceColors[key] || '#FF00FF').rgb) },
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getLayers(
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getLayerSlot(key) || 'bg',
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variant || 'bg',
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getOpacitySlot(variant),
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colors,
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opacity
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)
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)
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} else if (variant && variant !== key) {
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backgroundColor = colors[variant] || convert(sourceColors[variant]).rgb
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} else {
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backgroundColor = colors.bg || convert(sourceColors.bg)
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}
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const isLightOnDark = relativeLuminance(backgroundColor) < 0.5
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const mod = isLightOnDark ? 1 : -1
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let outputColor = null
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if (sourceColor) {
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// Color is defined in source color
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let targetColor = sourceColor
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if (targetColor === 'transparent') {
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// We take only layers below current one
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const layers = getLayers(
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getLayerSlot(key),
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key,
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getOpacitySlot(key) || key,
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colors,
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opacity
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).slice(0, -1)
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targetColor = {
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...alphaBlendLayers(
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convert('#FF00FF').rgb,
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layers
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),
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a: 0
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}
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} else if (typeof sourceColor === 'string' && sourceColor.startsWith('--')) {
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targetColor = computeDynamicColor(
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sourceColor,
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variableSlot => colors[variableSlot] || sourceColors[variableSlot],
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mod
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)
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} else if (typeof sourceColor === 'string' && sourceColor.startsWith('#')) {
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targetColor = convert(targetColor).rgb
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}
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outputColor = { ...targetColor }
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} else if (value.default) {
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// same as above except in object form
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outputColor = convert(value.default).rgb
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} else {
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// calculate color
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const defaultColorFunc = (mod, dep) => ({ ...dep })
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const colorFunc = value.color || defaultColorFunc
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if (value.textColor) {
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if (value.textColor === 'bw') {
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outputColor = contrastRatio(backgroundColor).rgb
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} else {
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let color = { ...colors[deps[0]] }
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if (value.color) {
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color = colorFunc(mod, ...deps.map((dep) => ({ ...colors[dep] })))
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}
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outputColor = getTextColor(
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backgroundColor,
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{ ...color },
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value.textColor === 'preserve'
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)
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}
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} else {
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// background color case
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outputColor = colorFunc(
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mod,
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...deps.map((dep) => ({ ...colors[dep] }))
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)
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}
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}
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if (!outputColor) {
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throw new Error('Couldn\'t generate color for ' + key)
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}
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const opacitySlot = value.opacity || getOpacitySlot(key)
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const ownOpacitySlot = value.opacity
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if (ownOpacitySlot === null) {
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outputColor.a = 1
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} else if (sourceColor === 'transparent') {
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outputColor.a = 0
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} else {
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const opacityOverriden = ownOpacitySlot && sourceOpacity[opacitySlot] !== undefined
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const dependencySlot = deps[0]
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const dependencyColor = dependencySlot && colors[dependencySlot]
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if (!ownOpacitySlot && dependencyColor && !value.textColor && ownOpacitySlot !== null) {
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// Inheriting color from dependency (weird, i know)
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// except if it's a text color or opacity slot is set to 'null'
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outputColor.a = dependencyColor.a
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} else if (!dependencyColor && !opacitySlot) {
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// Remove any alpha channel if no dependency and no opacitySlot found
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delete outputColor.a
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} else {
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// Otherwise try to assign opacity
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if (dependencyColor && dependencyColor.a === 0) {
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// transparent dependency shall make dependents transparent too
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outputColor.a = 0
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} else {
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// Otherwise check if opacity is overriden and use that or default value instead
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outputColor.a = Number(
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opacityOverriden
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? sourceOpacity[opacitySlot]
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: (OPACITIES[opacitySlot] || {}).defaultValue
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)
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}
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}
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}
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if (Number.isNaN(outputColor.a) || outputColor.a === undefined) {
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outputColor.a = 1
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}
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if (opacitySlot) {
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return {
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colors: { ...colors, [key]: outputColor },
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opacity: { ...opacity, [opacitySlot]: outputColor.a }
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}
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} else {
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return {
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colors: { ...colors, [key]: outputColor },
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opacity
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}
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}
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}, { colors: {}, opacity: {} })
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export const composePreset = (colors, radii, shadows, fonts) => {
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return {
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rules: {
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...shadows.rules,
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...colors.rules,
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...radii.rules,
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...fonts.rules
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},
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theme: {
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...shadows.theme,
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...colors.theme,
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...radii.theme,
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...fonts.theme
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}
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}
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}
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export const generatePreset = (input) => {
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const colors = generateColors(input)
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return composePreset(
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colors,
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generateRadii(input),
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generateShadows(input, colors.theme.colors, colors.mod),
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generateFonts(input)
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)
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}
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export const getCssShadow = (input, usesDropShadow) => {
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if (input.length === 0) {
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return 'none'
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}
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return input
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.filter(_ => usesDropShadow ? _.inset : _)
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.map((shad) => [
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shad.x,
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shad.y,
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shad.blur,
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shad.spread
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].map(_ => _ + 'px').concat([
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getCssColor(shad.color, shad.alpha),
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shad.inset ? 'inset' : ''
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]).join(' ')).join(', ')
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}
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const getCssShadowFilter = (input) => {
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if (input.length === 0) {
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return 'none'
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}
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return input
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// drop-shadow doesn't support inset or spread
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.filter((shad) => !shad.inset && Number(shad.spread) === 0)
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.map((shad) => [
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shad.x,
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shad.y,
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// drop-shadow's blur is twice as strong compared to box-shadow
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shad.blur / 2
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].map(_ => _ + 'px').concat([
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getCssColor(shad.color, shad.alpha)
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]).join(' '))
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.map(_ => `drop-shadow(${_})`)
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.join(' ')
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}
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export const generateColors = (themeData) => {
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const sourceColors = !themeData.themeEngineVersion
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? colors2to3(themeData.colors || themeData)
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: themeData.colors || themeData
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const { colors, opacity } = getColors(sourceColors, themeData.opacity || {})
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const htmlColors = Object.entries(colors)
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.reduce((acc, [k, v]) => {
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if (!v) return acc
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acc.solid[k] = rgb2hex(v)
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acc.complete[k] = typeof v.a === 'undefined' ? rgb2hex(v) : rgba2css(v)
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return acc
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}, { complete: {}, solid: {} })
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return {
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rules: {
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colors: Object.entries(htmlColors.complete)
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.filter(([k, v]) => v)
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.map(([k, v]) => `--${k}: ${v}`)
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.join(';')
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},
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theme: {
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colors: htmlColors.solid,
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opacity
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}
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}
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}
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export const generateRadii = (input) => {
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let inputRadii = input.radii || {}
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// v1 -> v2
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if (typeof input.btnRadius !== 'undefined') {
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inputRadii = Object
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.entries(input)
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.filter(([k, v]) => k.endsWith('Radius'))
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.reduce((acc, e) => { acc[e[0].split('Radius')[0]] = e[1]; return acc }, {})
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}
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const radii = Object.entries(inputRadii).filter(([k, v]) => v).reduce((acc, [k, v]) => {
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acc[k] = v
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return acc
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}, {
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btn: 4,
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input: 4,
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checkbox: 2,
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panel: 10,
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avatar: 5,
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avatarAlt: 50,
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tooltip: 2,
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attachment: 5,
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chatMessage: inputRadii.panel
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})
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return {
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rules: {
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radii: Object.entries(radii).filter(([k, v]) => v).map(([k, v]) => `--${k}Radius: ${v}px`).join(';')
|
|
},
|
|
theme: {
|
|
radii
|
|
}
|
|
}
|
|
}
|
|
|
|
export const generateFonts = (input) => {
|
|
const fonts = Object.entries(input.fonts || {}).filter(([k, v]) => v).reduce((acc, [k, v]) => {
|
|
acc[k] = Object.entries(v).filter(([k, v]) => v).reduce((acc, [k, v]) => {
|
|
acc[k] = v
|
|
return acc
|
|
}, acc[k])
|
|
return acc
|
|
}, {
|
|
interface: {
|
|
family: 'sans-serif'
|
|
},
|
|
input: {
|
|
family: 'inherit'
|
|
},
|
|
post: {
|
|
family: 'inherit'
|
|
},
|
|
postCode: {
|
|
family: 'monospace'
|
|
}
|
|
})
|
|
|
|
return {
|
|
rules: {
|
|
fonts: Object
|
|
.entries(fonts)
|
|
.filter(([k, v]) => v)
|
|
.map(([k, v]) => `--${k}Font: ${v.family}`).join(';')
|
|
},
|
|
theme: {
|
|
fonts
|
|
}
|
|
}
|
|
}
|
|
|
|
const border = (top, shadow) => ({
|
|
x: 0,
|
|
y: top ? 1 : -1,
|
|
blur: 0,
|
|
spread: 0,
|
|
color: shadow ? '#000000' : '#FFFFFF',
|
|
alpha: 0.2,
|
|
inset: true
|
|
})
|
|
const buttonInsetFakeBorders = [border(true, false), border(false, true)]
|
|
const inputInsetFakeBorders = [border(true, true), border(false, false)]
|
|
const hoverGlow = {
|
|
x: 0,
|
|
y: 0,
|
|
blur: 4,
|
|
spread: 0,
|
|
color: '--faint',
|
|
alpha: 1
|
|
}
|
|
|
|
export const DEFAULT_SHADOWS = {
|
|
panel: [{
|
|
x: 1,
|
|
y: 1,
|
|
blur: 4,
|
|
spread: 0,
|
|
color: '#000000',
|
|
alpha: 0.6
|
|
}],
|
|
topBar: [{
|
|
x: 0,
|
|
y: 0,
|
|
blur: 4,
|
|
spread: 0,
|
|
color: '#000000',
|
|
alpha: 0.6
|
|
}],
|
|
popup: [{
|
|
x: 2,
|
|
y: 2,
|
|
blur: 3,
|
|
spread: 0,
|
|
color: '#000000',
|
|
alpha: 0.5
|
|
}],
|
|
avatar: [{
|
|
x: 0,
|
|
y: 1,
|
|
blur: 8,
|
|
spread: 0,
|
|
color: '#000000',
|
|
alpha: 0.7
|
|
}],
|
|
avatarStatus: [],
|
|
panelHeader: [],
|
|
button: [{
|
|
x: 0,
|
|
y: 0,
|
|
blur: 2,
|
|
spread: 0,
|
|
color: '#000000',
|
|
alpha: 1
|
|
}, ...buttonInsetFakeBorders],
|
|
buttonHover: [hoverGlow, ...buttonInsetFakeBorders],
|
|
buttonPressed: [hoverGlow, ...inputInsetFakeBorders],
|
|
input: [...inputInsetFakeBorders, {
|
|
x: 0,
|
|
y: 0,
|
|
blur: 2,
|
|
inset: true,
|
|
spread: 0,
|
|
color: '#000000',
|
|
alpha: 1
|
|
}]
|
|
}
|
|
export const generateShadows = (input, colors) => {
|
|
// TODO this is a small hack for `mod` to work with shadows
|
|
// this is used to get the "context" of shadow, i.e. for `mod` properly depend on background color of element
|
|
const hackContextDict = {
|
|
button: 'btn',
|
|
panel: 'bg',
|
|
top: 'topBar',
|
|
popup: 'popover',
|
|
avatar: 'bg',
|
|
panelHeader: 'panel',
|
|
input: 'input'
|
|
}
|
|
|
|
const cleanInputShadows = Object.fromEntries(
|
|
Object.entries(input.shadows || {})
|
|
.map(([name, shadowSlot]) => [
|
|
name,
|
|
// defaulting color to black to avoid potential problems
|
|
shadowSlot.map(shadowDef => ({ color: '#000000', ...shadowDef }))
|
|
])
|
|
)
|
|
const inputShadows = cleanInputShadows && !input.themeEngineVersion
|
|
? shadows2to3(cleanInputShadows, input.opacity)
|
|
: cleanInputShadows || {}
|
|
const shadows = Object.entries({
|
|
...DEFAULT_SHADOWS,
|
|
...inputShadows
|
|
}).reduce((shadowsAcc, [slotName, shadowDefs]) => {
|
|
const slotFirstWord = slotName.replace(/[A-Z].*$/, '')
|
|
const colorSlotName = hackContextDict[slotFirstWord]
|
|
const isLightOnDark = relativeLuminance(convert(colors[colorSlotName]).rgb) < 0.5
|
|
const mod = isLightOnDark ? 1 : -1
|
|
const newShadow = shadowDefs.reduce((shadowAcc, def) => [
|
|
...shadowAcc,
|
|
{
|
|
...def,
|
|
color: rgb2hex(computeDynamicColor(
|
|
def.color,
|
|
(variableSlot) => convert(colors[variableSlot]).rgb,
|
|
mod
|
|
))
|
|
}
|
|
], [])
|
|
return { ...shadowsAcc, [slotName]: newShadow }
|
|
}, {})
|
|
|
|
return {
|
|
rules: {
|
|
shadows: Object
|
|
.entries(shadows)
|
|
// TODO for v2.2: if shadow doesn't have non-inset shadows with spread > 0 - optionally
|
|
// convert all non-inset shadows into filter: drop-shadow() to boost performance
|
|
.map(([k, v]) => [
|
|
`--${k}Shadow: ${getCssShadow(v)}`,
|
|
`--${k}ShadowFilter: ${getCssShadowFilter(v)}`,
|
|
`--${k}ShadowInset: ${getCssShadow(v, true)}`
|
|
].join(';'))
|
|
.join(';')
|
|
},
|
|
theme: {
|
|
shadows
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This handles compatibility issues when importing v2 theme's shadows to current format
|
|
*
|
|
* Back in v2 shadows allowed you to use dynamic colors however those used pure CSS3 variables
|
|
*/
|
|
export const shadows2to3 = (shadows, opacity) => {
|
|
return Object.entries(shadows).reduce((shadowsAcc, [slotName, shadowDefs]) => {
|
|
const isDynamic = ({ color = '#000000' }) => color.startsWith('--')
|
|
const getOpacity = ({ color }) => opacity[getOpacitySlot(color.substring(2).split(',')[0])]
|
|
const newShadow = shadowDefs.reduce((shadowAcc, def) => [
|
|
...shadowAcc,
|
|
{
|
|
...def,
|
|
alpha: isDynamic(def) ? getOpacity(def) || 1 : def.alpha
|
|
}
|
|
], [])
|
|
return { ...shadowsAcc, [slotName]: newShadow }
|
|
}, {})
|
|
}
|
|
|
|
export const colors2to3 = (colors) => {
|
|
return Object.entries(colors).reduce((acc, [slotName, color]) => {
|
|
const btnPositions = ['', 'Panel', 'TopBar']
|
|
switch (slotName) {
|
|
case 'lightBg':
|
|
return { ...acc, highlight: color }
|
|
case 'btnText':
|
|
return {
|
|
...acc,
|
|
...btnPositions
|
|
.reduce(
|
|
(statePositionAcc, position) =>
|
|
({ ...statePositionAcc, ['btn' + position + 'Text']: color })
|
|
, {}
|
|
)
|
|
}
|
|
default:
|
|
return { ...acc, [slotName]: color }
|
|
}
|
|
}, {})
|
|
}
|