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base.js
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base.js
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import * as REF from './ref.js'
import { GelPlates } from './template.js'
import { GelSheet } from './sheet.js'
import { HookBank,
AttrObserver,
BehaviorList } from './classes.js'
export const gel = (function(){
// localname of the element to search for as host in 'getHost'
const HOSTELNAME = 'gel-view'
// total number of all created gelamint instances
let totalGels = 0
// the number of instances of each class that have been created
const instanceCts = {}
// config object for initializing hooks on custom elements
const HOOKCONF = Object.freeze([
{ name: 'onConstruct' },
{ name: 'onConnect' },
{ name: 'onDisconnect' },
{ name: 'beforeDisconnect' },
{ name: 'afterConnect' },
{ name: 'afterFirstContent'},
{ name: 'afterAllConnect' },
{ name: 'afterRender', evergreen: true },
{ name: 'beforeRender', evergreen: true }
])
// RESERVED - reserved property names for the Gel.mint config object
const RESERVED = new Set([
'_tagName', '_styles', '_sheets',
'styles', 'stylesUrl', 'listeners',
'template', 'templateUrl', 'beforeRender',
'contents', 'bindAttributes', 'afterConnect',
'bindElements', 'onConstruct', 'afterRender',
'afterFirstContent','onConnect', 'observers',
'beforeDisconnect', 'attrBehaviors', 'eventDefaultsPrevented',
'onDisconnect', 'observedAttributes','subscriptions',
'attrObservers', 'publishers'
])
function getHostElement(el, name) {
if (el == null) {
return null
}
const parEl = el?.parentElement
?? el?.offsetParent
?? null;
if (parEl?.localName === name) {
return parEl
}
return getHostElement(parEl, name)
}
function generateUid(seed) {
totalGels += 1;
if (instanceCts[seed] === undefined) {
instanceCts[seed] = 0
}
instanceCts[seed] += 1
return seed.replace(/[^a-z0-9]/ig,'') + instanceCts[seed]
}
return class extends HTMLElement {
// allows instances of a class to access the static styles
// of other dynamically generated class definitions
static styleCatalog = new Map()
static reserved = new Set([ ...RESERVED, ...REF.DOMEVENTNAMES ]);
// the common stylesheet shared by all gel instances
static commonStyles = GelSheet.upgradeDocSheets()
.newSheetFromOwnSections({ exclude: [ 'root', 'declarations' ] });
static get viewportSize() {
if (gel.viewport == null) {
gel.viewport = { x: window.innerWidth, y: window.innerHeight }
setTimeout(()=> gel.viewport = null, 2000)
}
return gel.viewport
}
#host
#uid
#template
#sheet
#behaviors
#attrObs
#scratch
get host() {
if (this.#host == null) {
this.#host = getHostElement(this, HOSTELNAME)
}
return this.#host
}
get uid() {
if (!this.#uid) {
this.#uid = generateUid(this.localName);
}
return this.#uid
}
set template(t) {
// read-only after initial set
if (!this.#template) {
this.#template = t;
}
}
get template() {
return this.#template ?? null
}
get instanceStyles() {
if (!this.#sheet) {
this.#sheet = new GelSheet();
}
return this.#sheet
}
get behaviors() {
if (!this.#behaviors) {
this.#behaviors = new BehaviorList()
}
return this.#behaviors
}
get attrObs() {
if (!this.#attrObs) {
this.#attrObs = new AttrObserver()
}
return this.#attrObs
}
get scratch() {
if (!this.#scratch) {
this.#scratch = document.createElement('template');
}
return this.#scratch
}
get name() {
return this.readAttrOr('name', this.uid)
}
get allSlots() {
return Array.from((this.shadowRoot ?? this).querySelectorAll('slot'))
}
get classStyles() {
return this.constructor.classStyles
}
slots = {};
pubs = {};
subs = {};
relays = {};
constructor(opts) {
super().attachShadow({ mode:'open' });
this.setAttribute('uid', this.uid);
this.constructor.commonStyles.applyTo(this);
this.hooks = new HookBank(this.uid, HOOKCONF);
}
toggleAttr(a, cond) {
if ((cond !== undefined ? cond : !this.hasAttribute(a)) === true) {
this.setAttribute(a,'')
}
else {
this.removeAttribute(a)
}
}
readAttrOr(a, fb) {
if (this.hasAttribute(a)) {
return this.getAttribute(a)
}
return fb
}
readAllAttrs(el=this) {
return el.getAttributeNames().reduce(
(previousProps, currProp) => ({
...previousProps,
[currProp]: el.getAttribute(currProp)
}), {})
}
replaceClass(oldClass, newClass) {
this.classList.add(newClass);
if (this.classList.contains(oldClass)) {
requestAnimationFrame(()=> this.classList.remove(oldClass));
}
}
hasSlots() {
return this.allSlots?.length > 0
}
getSlot(name) {
return this.shadowRoot.querySelector(name === 'default' ?
'slot:not([name])' : `slot[name="${name}"]`)
}
getElement(strOrEl) {
if (strOrEl instanceof EventTarget) {
return strOrEl // that was easy
}
if (typeof strOrEl === 'string') {
const search = (this.shadowRoot ?? this).querySelector(strOrEl)
if (search) {
return search
}
const propRead = Reflect.get(this, strOrEl)
if (strOrEl in this && propRead instanceof EventTarget) {
return propRead
}
}
return null
}
getElements(selector) {
if (Array.isArray(selector)) {
return selector.map(item => this.getElement(item))
}
else {
return (this.shadowRoot??this).querySelectorAll(selector)
}
}
getHost(str = 'gel-view') {
return getHostElement(this, str)
}
setStylePropertyValue(styleProp, newValue, selector) {
return this.instanceStyles.updateStyleRule(styleProp, newValue, selector)
}
cloneShadowRoot(attrs) {
const tmpl = GelPlates.templify(this.shadowRoot.innerHTML);
if (attrs?.constructor?.name === 'Object') {
Object.entries(attrs).forEach(
([attr, attrValue])=> tmpl.setAttribute(attr, attrValue)
)
}
return tmpl
}
// traverse upward from this element until the provided search condition
// is met, returning node that satisfies condition
lookUpFor(el = this, condition = (node=> node.localName===HOSTELNAME)) {
let startNode = el;
while (startNode && !condition(startNode)) {
startNode = startNode.parentElement
}
return startNode
}
templify(content) {
this.scratch.innerHTML = content;
return this.scratch.content.cloneNode(true)
}
addExitHook(callback) {
this.hooks.beforeDisconnect.add(callback)
}
// identifies any named slots and if found, create shortcut properties for
// accessing their assigned elements. does the same for the default slot.
// if any slots are found with a 'type' attribute, also creates shortcut
// properties for accessing assigned elements by type
initSlots() {
this.slotNames = Array.from(this.shadowRoot.querySelectorAll('slot'))
?.map( slotEl => {
const slotName = slotEl.getAttribute('name') || 'default'
const slot = this.getSlot(slotName);
Object.defineProperty(this.slots, slotName, {
configurable: true,
enumerable: true,
get: function() {
if (slot.assignedElements().length)
return Array.from(slot.assignedElements())
if (slot.assignedNodes().length)
return Array.from(slot.assignedNodes())
return []
}
})
return slotName
}
);
this.slotTypes = Array.from(new Set(
Array.from(this.shadowRoot.querySelectorAll('slot[type]'))
.map( node => node.getAttribute('type'))
));
if (this.slotTypes.length) {
Object.defineProperty(this.slots, 'type', { value: {} });
const self = this
this.slotTypes.forEach( typeValue =>
Object.defineProperty(this.slots.type, typeValue, {
configurable: true,
enumerable: true,
get: function(){
return Array.from(
self.shadowRoot.querySelectorAll(
`slot[type="${typeValue}"]`
)
).map( slot => slot.getAttribute('name'))
}
})
)
}
}
// method used to commit content and markup changes to the
// element's shadowRoot or standard DOM subtree
render(options) {
if (this.hooks.beforeRender.size > 0) {
this.hooks.beforeRender.run.call(this)
}
this.#replaceContent(options?.constructor?.name === 'Object' ?
options
: {
content: options,
container: null,
opts: {}
});
this.renderCount += 1
this.hooks.afterRender.run.call(this)
return this.shadowRoot ?? this
}
// inserts or replaces content in the component's shadowRoot
// When a container reference is provided, only content within that
// referenced container will be replaced
#replaceContent({ content, container, opts={} }) {
const target = this.shadowRoot ?? this
const query = `[gel-content="${container}"]`
if (!(content instanceof EventTarget)) {
content = GelPlates.templify(
typeof content==='string' ?
content
: this.template()
);
}
if (opts?.noClone!==true) {
content = (content.content ?? content).cloneNode(true);
}
if ( (this.renderCount !== 0)
&& (container != null)
&& (target.querySelector(query) != null)) {
container = target.querySelector(query);
}
else {
container = target
}
container.replaceChildren( content )
}
attributeChangedCallback(...args) {
this.attrObs.processAttrChanges(...args)
}
disconnectedCallback() {
this.hooks.beforeDisconnect.run.call(this)
this.attrObs.ready = false
setTimeout(()=> { this.hooks.onDisconnect.run.call(this) })
}
disappear(){
this.classList.remove('visible')
this.classList.remove('opaque')
}
appear() {
this.classList.add('visible')
this.classList.add('opaque')
}
}
})()