qortal-ui/core/translate/directives/lang-changed-base.js

import { AsyncDirective } from 'lit/async-directive.js'
import { listenForLangChanged } from '../util.js'

export class LangChangedDirectiveBase extends AsyncDirective {
    constructor() {
        super(...arguments)
        this.langChangedSubscription = null
        this.getValue = (() => "")
    }

    renderValue(getValue) {
        this.getValue = getValue
        this.subscribe()
        return this.getValue()
    }

    langChanged(e) {
        this.setValue(this.getValue(e))
    }

    subscribe() {
        if (this.langChangedSubscription == null) {
            this.langChangedSubscription = listenForLangChanged(this.langChanged.bind(this))
        }
    }

    unsubscribe() {
        if (this.langChangedSubscription != null) {
            this.langChangedSubscription()
        }
    }

    disconnected() {
        this.unsubscribe()
    }

    reconnected() {
        this.subscribe()
    }
}