@studiometa/js-toolkit/Base/Base.js

A set of useful little bits of JavaScript to boost your project! 🚀

import {
  getComponentElements,
  getEventTarget,
  addToQueue,
  addInstance,
  deleteInstance
} from "./utils.js";
import {
  ChildrenManager,
  RefsManager,
  ServicesManager,
  EventsManager,
  OptionsManager
} from "./managers/index.js";
import { noop, isDev, isFunction, isArray } from "../utils/index.js";
let id = 0;
class Base {
  /**
   * This is a Base instance.
   */
  static $isBase = true;
  /**
   * The instance parent.
   */
  $parent = null;
  /**
   * The instance id.
   */
  $id;
  /**
   * The root element.
   */
  $el;
  /**
   * The state of the component.
   */
  $isMounted = false;
  /**
   * Is the component currently mounting itself and its children?
   * @private
   */
  __isMounting = false;
  /**
   * Store the event handlers.
   * @private
   */
  __eventHandlers = /* @__PURE__ */ new Map();
  /**
   * Get the root instance of the app.
   */
  get $root() {
    if (!this.$parent) {
      return this;
    }
    let parent = this.$parent;
    let root = this.$parent;
    while (parent) {
      if (!parent.$parent) {
        root = parent;
      }
      parent = parent.$parent;
    }
    return root;
  }
  /**
   * Merge configuration with the parents' configurations.
   * @private
   */
  get __config() {
    let proto = Object.getPrototypeOf(this);
    let { config } = proto.constructor;
    while (proto.constructor.config && proto.constructor.$isBase) {
      config = { ...proto.constructor.config, ...config };
      if (proto.constructor.config.options) {
        config.options = { ...proto.constructor.config.options, ...config.options };
      }
      if (proto.constructor.config.emits && config.emits) {
        config.emits = [...proto.constructor.config.emits, ...config.emits];
      }
      proto = Object.getPrototypeOf(proto);
    }
    config.options = config.options ?? {};
    config.refs = config.refs ?? [];
    config.components = config.components ?? {};
    return config;
  }
  get $config() {
    return this.__config;
  }
  static config = {
    name: "Base",
    emits: [
      // hook events
      "before-mounted",
      "mounted",
      "updated",
      "destroyed",
      "terminated",
      // default services' events
      "ticked",
      "scrolled",
      "resized",
      "moved",
      "loaded",
      "keyed"
    ]
  };
  __services;
  get $services() {
    return this.__services;
  }
  __refs;
  get $refs() {
    return this.__refs.props;
  }
  __options;
  get $options() {
    return this.__options.props;
  }
  __children;
  get $children() {
    return this.__children.props;
  }
  __events;
  /**
   * Small helper to log stuff.
   */
  get $log() {
    return this.$options.log ? window.console.log.bind(window, `[${this.$id}]`) : noop;
  }
  /**
   * Small helper to make warning easier.
   */
  get $warn() {
    return this.$options.log ? window.console.warn.bind(window, `[${this.$id}]`) : noop;
  }
  /**
   * Small helper to debug information.
   */
  get __debug() {
    return isDev && this.$options.debug ? window.console.log.bind(window, `[debug] [${this.$id}]`) : noop;
  }
  /**
   * Get manager constructors.
   */
  get __managers() {
    return {
      ChildrenManager,
      EventsManager,
      OptionsManager,
      RefsManager,
      ServicesManager
    };
  }
  /**
   * Call an instance method and emit corresponding events.
   */
  __callMethod(method, ...args) {
    if (isDev) {
      this.__debug("callMethod", method, ...args);
    }
    this.$emit(method, ...args);
    if (!isFunction(this[method])) {
      return null;
    }
    if (isDev) {
      this.__debug(method, this, ...args);
    }
    return this[method].call(this, ...args);
  }
  /**
   * Test if the given event has been bound to the instance.
   *
   * @param   {string} event The event's name.
   * @returns {boolean}      Wether the given event has been bound or not.
   */
  __hasEvent(event) {
    const eventHandlers = this.__eventHandlers.get(event);
    return eventHandlers && eventHandlers.size > 0;
  }
  /**
   * Class constructor where all the magic takes place.
   *
   * @param {HTMLElement} element The component's root element dd.
   */
  constructor(element) {
    if (!element) {
      if (isDev) {
        throw new Error("The root element must be defined.");
      }
      return;
    }
    const { __config } = this;
    if (__config.name === "Base") {
      if (isDev) {
        throw new Error("The `config.name` property is required.");
      }
      return;
    }
    this.$id = `${__config.name}-${id}`;
    id += 1;
    this.$el = element;
    if (!this.$el.__base__) {
      this.$el.__base__ = /* @__PURE__ */ new WeakMap();
    }
    this.$el.__base__.set(this.constructor, this);
    for (const service of ["Options", "Services", "Events", "Refs", "Children"]) {
      this[`__${service.toLowerCase()}`] = new this.__managers[`${service}Manager`](this);
    }
    this.$on("mounted", () => {
      addInstance(this);
    });
    this.$on("destroyed", () => {
      deleteInstance(this);
    });
    if (isDev) {
      this.__debug("constructor", this);
    }
  }
  /**
   * Trigger the `mounted` callback.
   */
  async $mount() {
    if (this.$isMounted || this.__isMounting) {
      return this;
    }
    this.__isMounting = true;
    this.$emit("before-mounted");
    if (isDev) {
      this.__debug("$mount");
    }
    await Promise.all([
      addToQueue(() => this.__children.registerAll()),
      addToQueue(() => this.__refs.registerAll()),
      addToQueue(() => this.__events.bindRootElement()),
      addToQueue(() => this.__services.enableAll()),
      addToQueue(() => this.__children.mountAll())
    ]);
    await addToQueue(() => {
      this.$isMounted = true;
      this.__callMethod("mounted");
    });
    this.__isMounting = false;
    return this;
  }
  /**
   * Update the instance children.
   */
  async $update() {
    if (isDev) {
      this.__debug("$update");
    }
    await Promise.all([
      // Undo
      addToQueue(() => this.__refs.unregisterAll()),
      addToQueue(() => this.__services.disableAll()),
      // Redo
      addToQueue(() => this.__children.registerAll()),
      addToQueue(() => this.__refs.registerAll()),
      addToQueue(() => this.__services.enableAll()),
      // Update
      addToQueue(() => this.__children.updateAll())
    ]);
    await addToQueue(() => this.__callMethod("updated"));
    return this;
  }
  /**
   * Trigger the `destroyed` callback.
   */
  async $destroy() {
    if (!this.$isMounted) {
      return this;
    }
    if (isDev) {
      this.__debug("$destroy");
    }
    this.$isMounted = false;
    await Promise.all([
      addToQueue(() => this.__events.unbindRootElement()),
      addToQueue(() => this.__refs.unregisterAll()),
      addToQueue(() => this.__services.disableAll()),
      addToQueue(() => this.__children.destroyAll())
    ]);
    await addToQueue(() => this.__callMethod("destroyed"));
    return this;
  }
  /**
   * Terminate a child instance when it is not needed anymore.
   */
  async $terminate() {
    if (isDev) {
      this.__debug("$terminate");
    }
    await Promise.all([
      // First, destroy the component.
      addToQueue(() => this.$destroy()),
      // Execute the `terminated` hook if it exists
      addToQueue(() => this.__callMethod("terminated")),
      // Delete instance
      addToQueue(() => this.$el.__base__.set(this.constructor, "terminated"))
    ]);
  }
  /**
   * Add an emitted event.
   *
   * @param   {string} event The event name.
   * @returns {void}
   */
  __addEmits(event) {
    const ctor = this.constructor;
    if (isArray(ctor.config.emits)) {
      ctor.config.emits.push(event);
    } else {
      ctor.config.emits = [event];
    }
  }
  /**
   * Remove an emitted event.
   *
   * @param   {string} event The event name.
   * @returns {void}
   */
  __removeEmits(event) {
    const ctor = this.constructor;
    const index = ctor.config.emits.indexOf(event);
    ctor.config.emits.splice(index, 1);
  }
  /**
   * Bind a listener function to an event.
   *
   * @param  {string} event
   *   Name of the event.
   * @param  {EventListenerOrEventListenerObject} listener
   *   Function to be called.
   * @param {boolean|AddEventListenerOptions} [options]
   *   Options for the `removeEventListener` method.
   * @returns {() => void}
   *   A function to unbind the listener.
   */
  $on(event, listener, options) {
    if (isDev) {
      this.__debug("$on", event, listener, options);
    }
    let set = this.__eventHandlers.get(event);
    if (!set) {
      set = /* @__PURE__ */ new Set();
      this.__eventHandlers.set(event, set);
    }
    set.add(listener);
    const target = getEventTarget(this, event, this.__config);
    target?.addEventListener(event, listener, options);
    if (isDev) {
      if (!target) {
        console.warn(
          `[${this.$id}]`,
          `The "${event}" event is missing from the configuration and is not a native`,
          `event for the root element of type \`${this.$el.constructor.name}\`.`
        );
      }
    }
    return () => {
      this.$off(event, listener, options);
    };
  }
  /**
   * Unbind a listener function from an event.
   *
   * @param {string} event
   *   Name of the event.
   * @param {EventListenerOrEventListenerObject} listener
   *   Function to be removed.
   * @param {boolean|EventListenerOptions} [options]
   *   Options for the `removeEventListener` method.
   * @returns {void}
   */
  $off(event, listener, options) {
    if (isDev) {
      this.__debug("$off", event, listener);
    }
    this.__eventHandlers.get(event).delete(listener);
    const target = getEventTarget(this, event, this.__config);
    target?.removeEventListener(event, listener, options);
  }
  /**
   * Emits an event.
   *
   * @param  {string} event Name of the event.
   * @param  {any[]}  args  The arguments to apply to the functions bound to this event.
   * @returns {void}
   */
  $emit(event, ...args) {
    if (isDev) {
      this.__debug("$emit", event, args);
    }
    this.$el.dispatchEvent(
      event instanceof Event ? event : new CustomEvent(event, { detail: args })
    );
  }
  /**
   * Register and mount all instances of the component.
   */
  static $register(nameOrSelector) {
    return getComponentElements(nameOrSelector ?? this.config.name).map(
      (el) => new this(el).$mount()
    );
  }
}
export {
  Base
};
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