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54 lines
1007 B
JavaScript
54 lines
1007 B
JavaScript
export class StateProvider extends HTMLElement {
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constructor() {
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super()
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this.appendChild(document.createElement('slot'))
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this.observers = []
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}
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connectedCallback() {
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this.value = this.getAttribute('value')
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}
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get name() {
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return this.getAttribute('name')
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}
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get value() {
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return this._val
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}
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set value(newValue) {
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// if (this.value !== newValue) {
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this._val = newValue
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this.notifyObservers()
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// }
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}
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static get observedAttributes() {
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return ['value']
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}
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attributeChangedCallback(name, oldValue, newValue) {
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// console.log('attrChange', name, oldValue, newValue)
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if (name === 'value') {
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this.value = newValue
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}
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}
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notifyObservers() {
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for (let obs of this.observers) {
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obs.update(this)
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}
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}
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addObserver(obs) {
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this.observers.push(obs)
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}
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removeObserver(obs) {
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this.observers = this.observers.filter(el => el !== obs)
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}
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}
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window.customElements.define('state-provider', StateProvider)
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