# All files CustomVideoElement.js

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83.33% Branches 20/24
100% Functions 12/12
96.65% Lines 289/299

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     import 'castable-video';

    /**
     * Custom Video Element
     * The goal is to create an element that works just like the video element
     * but can be extended/sub-classed, because native elements cannot be
     * extended today across browsers.
     */

    // The onevent like props are weirdly set on the HTMLElement prototype with other
    // generic events making it impossible to pick these specific to HTMLMediaElement.
    export const VideoEvents = [
      'abort',
      'canplay',
      'canplaythrough',
      'durationchange',
      'emptied',
      'encrypted',
      'ended',
      'error',
      'loadeddata',
      'loadedmetadata',
      'loadstart',
      'pause',
      'play',
      'playing',
      'progress',
      'ratechange',
      'seeked',
      'seeking',
      'stalled',
      'suspend',
      'timeupdate',
      'volumechange',
      'waiting',
      'waitingforkey',
      'resize',
      'enterpictureinpicture',
      'leavepictureinpicture',
      'castchange',
      'entercast',
      'leavecast',
    ];

    const template = document.createElement('template');
    // Could you get styles to apply by passing a global button from global to shadow?

    template.innerHTML = `
    <style>
      :host {
        display: inline-block;
        line-height: 0;
        width: auto;
        height: auto;
      }

      video {
        max-width: 100%;
        max-height: 100%;
        min-width: 100%;
        min-height: 100%;
      }
    </style>
    <video is="castable-video" part="video" crossorigin></video>
    <slot></slot>
    `;

    class CustomVideoElement extends HTMLElement {
      #hasAttrCallback;
      #isInit;

      constructor() {
        super();
        this.attachShadow({ mode: 'open' });

        // If the custom element is defined before the <custom-video> HTML is parsed
        // no attributes will be available in the constructor (construction process).
        // Wait until initializing attributes in the attributeChangedCallback.
        // If this element is connected to the DOM, the attributes will be available.
        if (this.isConnected) {
          this.#init();
        }
      }

      #init() {
        if (this.#isInit) return;
        this.#isInit = true;

        this.shadowRoot.append(template.content.cloneNode(true));
        this.nativeEl = this.shadowRoot.querySelector('video');

        // The video events are dispatched on the CustomVideoElement instance.
        // This makes it possible to add event listeners before the element is upgraded.
        VideoEvents.forEach((type) => {
          this.nativeEl.addEventListener(type, (evt) => {
            this.dispatchEvent(new CustomEvent(evt.type, { detail: evt.detail }));
          });
        });

        // An unnamed <slot> will be filled with all of the custom element's
        // top-level child nodes that do not have the slot attribute.
        const slotEl = this.shadowRoot.querySelector('slot');
        slotEl.addEventListener('slotchange', () => {
          slotEl.assignedElements().forEach((el) => {
            if (!['track', 'source'].includes(el.localName)) return;
            this.nativeEl.append(el);
          });
        });

        // Initialize all the attribute properties
        // This is required before attributeChangedCallback is called after construction
        // so the initial state of all the attributes are forwarded to the native element.
        // Don't call attributeChangedCallback directly here because the extending class
        // could have overridden attributeChangedCallback leading to unexpected results.
        Array.prototype.forEach.call(this.attributes, (attrNode) => {
          this.#forwardAttribute(attrNode.name, null, attrNode.value);
        });

        // Neither Chrome or Firefox support setting the muted attribute
        // after using document.createElement.
        // One way to get around this would be to build the native tag as a string.
        // But just fixing it manually for now.
        // Apparently this may also be an issue with <input checked> for buttons
        if (this.nativeEl.defaultMuted) {
          this.nativeEl.muted = true;
        }
      }

      // observedAttributes is required to trigger attributeChangedCallback
      // for any attributes on the custom element.
      // Attributes need to be the lowercase word, e.g. crossorigin, not crossOrigin
      static get observedAttributes() {
        let attrs = [];

        const kebabCase = (name) => {
          return name.replace(/([a-z])([A-Z])/g, '$1-$2').toLowerCase();
        };

        // Instead of manually creating a list of all observed attributes, observe
        // any getter/setter prop name (lowercase or kebab-case for custom builtins)
        Object.getOwnPropertyNames(this.prototype).forEach((propName) => {
          let isFunc = false;

          // Non-func properties throw errors because it's not an instance
          try {
            if (typeof this.prototype[propName] === 'function') {
              isFunc = true;
            }
          } catch (e) {}

          // Exclude functions and constants
          if (!isFunc && propName !== propName.toUpperCase()) {
            attrs.push(propName.toLowerCase(), kebabCase(propName));
          }
        });

        // Include any attributes from the super class (recursive)
        const supAttrs = Object.getPrototypeOf(this).observedAttributes;

        if (supAttrs) {
          attrs = attrs.concat(supAttrs);
        }

        return attrs;
      }

      attributeChangedCallback(attrName, oldValue, newValue) {
        // Initialize the attributes right after construction when they become available.
        if (!this.#hasAttrCallback && !this.isConnected) {
          this.#hasAttrCallback = true;
          this.#init();
        }

        this.#forwardAttribute(attrName, oldValue, newValue);
      }

      // We need to handle sub-class custom attributes differently from
      // attrs meant to be passed to the internal native el.
      #forwardAttribute(attrName, oldValue, newValue) {
        // Find the matching prop for custom attributes
        const ownProps = Object.getOwnPropertyNames(Object.getPrototypeOf(this));
        const propName = arrayFindAnyCase(ownProps, attrName);

        // Check if this is the original custom native elemnt or a subclass
        const isBaseElement = Object.getPrototypeOf(this.constructor).toString().indexOf('function HTMLElement') === 0;

        // If this is a subclass custom attribute we want to set the
        // matching property on the subclass
        if (propName && !isBaseElement) {
          // Boolean props should never start as null
          if (typeof this[propName] == 'boolean') {
            // null is returned when attributes are removed i.e. boolean attrs
            if (newValue === null) {
              this[propName] = false;
            } else {
              // The new value might be an empty string, which is still true
              // for boolean attributes
              this[propName] = true;
            }
          } else {
            this[propName] = newValue;
          }
        } else {
          // When this is the original Custom Element, or the subclass doesn't
          // have a matching prop, pass it through.
          if (newValue === null) {
            this.nativeEl.removeAttribute(attrName);
          } else {
            // Ignore a few that don't need to be passed through just in case
            // it creates unexpected behavior.
            if (['id', 'class'].indexOf(attrName) === -1) {
              this.nativeEl.setAttribute(attrName, newValue);
            }
          }
        }
      }

      connectedCallback() {}
    }

    // Map all native element properties to the custom element
    // so that they're applied to the native element.
    // Skipping HTMLElement because of things like "attachShadow"
    // causing issues. Most of those props still need to apply to
    // the custom element.
    let nativeElProps = [];

    // Can't check typeof directly on element prototypes without
    // throwing Illegal Invocation errors, so creating an element
    // to check on instead.
    const nativeElTest = document.createElement('video', {
      is: 'castable-video',
    });

    // Deprecated props throw warnings if used, so exclude them
    const deprecatedProps = ['webkitDisplayingFullscreen', 'webkitSupportsFullscreen'];

    // Walk the prototype chain up to HTMLElement.
    // This will grab all super class props in between.
    // i.e. VideoElement and MediaElement
    for (
      let proto = Object.getPrototypeOf(nativeElTest);
      proto && proto !== HTMLElement.prototype;
      proto = Object.getPrototypeOf(proto)
    ) {
      Object.getOwnPropertyNames(proto).forEach((key) => {
        if (deprecatedProps.indexOf(key) === -1) {
          nativeElProps.push(key);
        }
      });
    }

    // Passthrough native el functions from the custom el to the native el
    nativeElProps.forEach((prop) => {
      if (prop in CustomVideoElement.prototype) return;

      const type = typeof nativeElTest[prop];
      if (type == 'function') {
        // Function
        CustomVideoElement.prototype[prop] = function () {
          return this.nativeEl[prop].apply(this.nativeEl, arguments);
        };
      } else {
        // Getter
        let config = {
          get() {
            return this.nativeEl[prop];
          },
        };

        if (prop !== prop.toUpperCase()) {
          // Setter (not a CONSTANT)
          config.set = function (val) {
            this.nativeEl[prop] = val;
          };
        }

        Object.defineProperty(CustomVideoElement.prototype, prop, config);
      }
    });

    function arrayFindAnyCase(arr, word) {
      let found = null;

      arr.forEach((item) => {
        if (item.toLowerCase() == word.toLowerCase()) {
          found = item;
        }
      });

      return found;
    }

    if (!globalThis.customElements.get('custom-video')) {
      globalThis.customElements.define('custom-video', CustomVideoElement);
      globalThis.CustomVideoElement = CustomVideoElement;
    }

    export default CustomVideoElement;