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import { registerElement, registerCSSProperties } from './util.js'
import html from './color-wheel.element.html'
import css from './color-wheel.element.css'
let loadTemplate = () => {
const templateElement = document.createElement('template')
templateElement.innerHTML = html
loadTemplate = () => templateElement
return templateElement
}
let loadStyles = () => {
const sheet = new CSSStyleSheet()
sheet.replaceSync(css)
loadStyles = () => sheet
return sheet
}
/**
*
* @param {TransitionEvent} event - property transition event
*/
function uiModeTransitionEventHandler (event) {
const { target } = event
if (!(target instanceof HTMLElement)) return
const rootNode = target.getRootNode()
if (!(rootNode instanceof ShadowRoot)) return
const { host } = rootNode
if (host instanceof ColorWheelElement) {
updateContainerUIModeClass(host)
}
}
/** @type {(shadowRoot: ParentNode | null, selector: string) => HTMLElement } */
const queryRequired = (shadowRoot, selector) => {
if (!shadowRoot) { throw new Error(`Color-wheel: Error from shadowDOM: parent node is ${shadowRoot}`) }
const result = shadowRoot.querySelector(selector)
if (!result || !(result instanceof HTMLElement)) { throw new Error(`Color-wheel: Error from shadowDOM: html element "${selector}" not found`) }
return result
}
class ColorWheelElement extends HTMLElement {
constructor () {
super()
const shadowRoot = this.attachShadow({ mode: 'open' })
shadowRoot.adoptedStyleSheets = [loadStyles()]
const template = loadTemplate()
shadowRoot.append(document.importNode(template.content, true))
const fromShadowRoot = queryRequired.bind(null, shadowRoot)
const wheelContainer = fromShadowRoot('.color-wheel-container')
const innerRadiusCalc = fromShadowRoot('.inner-radius-calc')
const wheel = fromShadowRoot('.color-wheel')
const slider = fromShadowRoot('.slider')
if (!wheelContainer || !innerRadiusCalc) {
throw new Error('Error loading Color-wheel: ".color-wheel-container", ".inner-radius-calc", ".color-wheel" or not found')
}
const wheelStyle = window.getComputedStyle(wheel)
updateContainerUIModeClass(this)
reflectLightness(this)
reflectValue(this)
getContainer(this).addEventListener('transitionstart', uiModeTransitionEventHandler)
const getWheelCenterPoint = () => {
const pointerBox = wheelContainer.getBoundingClientRect()
const centerPoint = wheelStyle.transformOrigin
const centers = centerPoint.split(' ')
const centerY = pointerBox.top + parseInt(centers[1])
const centerX = pointerBox.left + parseInt(centers[0])
return { x: centerX, y: centerY }
}
const getRadiusValues = () => {
const pointerBox = wheelContainer.getBoundingClientRect()
const innerRadiusCSSValue = wheelStyle.getPropertyValue('--inner-radius').trim()
if (/[0-9]+%/g.test(innerRadiusCSSValue)) {
const innerRadiusPerc = parseFloat(innerRadiusCSSValue)
return CircleInfo.fromRectWithPercentInnerRadius(pointerBox, innerRadiusPerc)
}
const innerRadius = innerRadiusCalc.getBoundingClientRect().width
return CircleInfo.fromRectWithInnerRadius(pointerBox, innerRadius)
}
/**
* Inits drag event, calling `callback` until it finishes, preventing default event and propagation during the operation
* @param {(event: PointerEvent) => void} callback - callback to execute
*/
const initDrag = (callback) => {
const window = this.ownerDocument.defaultView
if (!window) { return }
/** @param {PointerEvent} e - event to pass to `callback` */
const defaultPrevented = e => { e.preventDefault(); e.stopPropagation(); callback(e) }
window.addEventListener('pointermove', defaultPrevented, { capture: true })
window.addEventListener('pointerup', () => {
window.removeEventListener('pointermove', defaultPrevented, { capture: true })
}, { once: true, capture: true })
}
/**
* Init slider drag and drop
*/
const initSliderDrag = () => {
const centerPoint = getWheelCenterPoint()
const disk = getRadiusValues()
/** @param {PointerEvent} e - pointermove event */
const slideSaturation = (e) => {
const saturationPoint = {
x: centerPoint.x,
y: Math.min(centerPoint.y, e.clientY),
}
const newSaturation = calculateSaturation(disk, saturationPoint)
this.saturation = newSaturation
const event = new CustomEvent('input', { bubbles: true })
this.dispatchEvent(event)
}
initDrag(slideSaturation)
}
/** @param {PointerEvent} pointerEvent - pointerdown event */
const initWheelDrag = (pointerEvent) => {
const centerPoint = getWheelCenterPoint()
const disk = getRadiusValues()
const { hue } = this
/**
* @param {PointerEvent} e - pointermove event
* @returns {number} theta value in degrees
*/
const getAngle = (e) => {
const deltaX = e.clientX - centerPoint.x
const deltaY = centerPoint.y - e.clientY
const thetaRadians = Math.atan2(deltaY, deltaX)
return thetaRadians * -180 / Math.PI
}
const initDeg = getAngle(pointerEvent)
const uiMode = this.uiMode
if ((uiMode || '').trim() === 'mobile') {
/** @param {PointerEvent} e - pointermove event */
const rotateWheel = (e) => {
const deg = getAngle(e)
const newHue = Math.round(deg - initDeg + hue + 360) % 360
this.hue = newHue
const event = new CustomEvent('input', { bubbles: true })
this.dispatchEvent(event)
}
initDrag(rotateWheel)
} else {
/** @param {PointerEvent} e - pointermove event */
const rotateSlider = (e) => {
const deg = getAngle(e)
const newHue = Math.round(-deg + 360 * 2 - 90) % 360
this.hue = newHue
const clientPoint = { x: e.clientX, y: e.clientY }
const newSaturation = calculateSaturation(disk, clientPoint)
this.saturation = newSaturation
const event = new CustomEvent('input', { bubbles: true })
this.dispatchEvent(event)
}
rotateSlider(pointerEvent)
initDrag(rotateSlider)
}
}
wheel.addEventListener('pointerdown', (event) => {
event.preventDefault()
event.stopPropagation()
initWheelDrag(/** @type {PointerEvent} */ (event))
})
slider.addEventListener('pointerdown', (event) => {
event.preventDefault()
event.stopPropagation()
initSliderDrag()
})
reflectHue(this)
reflectSaturation(this)
}
static get observedAttributes () {
return ['saturation', 'hue', 'lightness', 'value']
}
/**
* @param {string} name - changed attribute name
* @param {string} oldValue - old attribute value
* @param {string} newValue - new attribute value
*/
attributeChangedCallback (name, oldValue, newValue) {
if (oldValue === newValue) return
switch (name) {
case 'saturation':
reflectSaturation(this)
return
case 'hue':
reflectHue(this)
return
case 'lightness':
reflectLightness(this)
return
case 'value':
reflectValue(this)
}
}
get uiMode () {
const computedStyle = getComputedStyle(getContainer(this))
const uiMode = computedStyle.getPropertyValue('--ui-mode').trim()
switch (uiMode) {
case 'desktop':
case 'mobile':
return uiMode
}
return computedStyle.getPropertyValue('--default-ui-mode').trim()
}
get hue () {
return getNumericValueFromAttribute(this, 'hue', 0)
}
set hue (hue) {
this.setAttribute('hue', String(hue))
}
get saturation () {
return getNumericValueFromAttribute(this, 'saturation', 0)
}
set saturation (saturation) {
this.setAttribute('saturation', String(saturation))
}
get value () {
return getNumericValueFromAttribute(this, 'value', 100)
}
set value (value) {
this.setAttribute('value', String(value))
}
get lightness () {
return getNumericValueFromAttribute(this, 'lightness', 50)
}
set lightness (lightness) {
this.setAttribute('lightness', String(lightness))
}
}
/**
* @param {import('./geometry.js').Disk} disk - color wheel geometry
* @param {import('./geometry.js').Point} point - target position
* @returns {number} saturation value, will not go below 0 or above 100
*/
function calculateSaturation (disk, point) {
const { center, radius, innerRadiusPerc } = disk
const r = calculateDistanceBetween2Points(center, point)
const rperc = Math.min(100, Math.max(0, r * 100 / radius))
const saturation = (rperc - innerRadiusPerc) * 100 / (100 - innerRadiusPerc)
return Math.round(Math.min(100, Math.max(0, saturation)))
}
/**
* @param {ColorWheelElement} element - target Element
* @param {string} attribute - attribute
* @param {number} defaultValue - default value
* @returns {number} - numeric value, or default if not defined or invalid
*/
function getNumericValueFromAttribute (element, attribute, defaultValue) {
const value = element.getAttribute(attribute)
if (!value) { return defaultValue }
const asInt = parseInt(value)
return isNaN(asInt) ? defaultValue : asInt
}
/**
* @param {ColorWheelElement} element - target element
* @returns {HTMLElement} container element
*/
const getContainer = element => queryRequired(element.shadowRoot, '.container')
/**
* @param {ColorWheelElement} element - target element
* @param {string} property - css
* @param {string | number} value - new valuw
*/
const setContainerProperty = (element, property, value) => { getContainer(element).style.setProperty(property, String(value)) }
/**
*
* @param {ColorWheelElement} element - target element
*/
function updateContainerUIModeClass (element) {
const container = getContainer(element)
const { uiMode } = element
container.classList.toggle('container--desktop-ui', uiMode === 'desktop')
container.classList.toggle('container--mobile-ui', uiMode === 'mobile')
}
/**
* updates ColorWheelElement color view based on the data
* By default it used the HSV color scheme, it only uses HSL when only HSL attributes are defined
* @param {ColorWheelElement} element - target element
*/
function reflectHsl (element) {
const container = getContainer(element)
if (!container) { return }
const setHSLMode = element.hasAttribute('lightness') && !element.hasAttribute('value')
container.classList.toggle('container--hsl', setHSLMode)
}
/** @param {ColorWheelElement} element - target element */
const reflectHue = element => { setContainerProperty(element, '--hue', element.hue) }
/** @param {ColorWheelElement} element - target element */
const reflectSaturation = element => { setContainerProperty(element, '--saturation', element.saturation) }
/** @param {ColorWheelElement} element - target element */
const reflectLightness = element => { reflectHsl(element); setContainerProperty(element, '--lightness', element.lightness) }
/** @param {ColorWheelElement} element - target element */
const reflectValue = element => { reflectHsl(element); setContainerProperty(element, '--value', element.value) }
const url = new URL(import.meta.url)
const elementName = url.searchParams.get('named')
elementName && registerElement(elementName, ColorWheelElement)
registerCSSProperties()
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