# Source: alpha/not-complete/simple-tree.js

    /** Define a new zero dependency custom web component ECMA module that can be used as an HTML tag
     *
     * TO USE THIS TEMPLATE: CHANGE ALL INSTANCES OF 'SimpleContainer' and 'simple-container' & change version below
     *
     * version 0.1 2022-05-15 Pre-release
     *
     * See: https://web.dev/custom-elements-v1/, https://web.dev/shadowdom-v1/
     *
     * See https://github.com/runem/web-component-analyzer#-how-to-document-your-components-using-jsdoc on how to document
     * Use `npx web-component-analyzer ./components/button-send.js` to create/update the documentation
     *     or paste into https://runem.github.io/web-component-analyzer/
     * Use `npx web-component-analyzer ./components/*.js --format vscode --outFile ./vscode-descriptors/ti-web-components.html-data.json`
     *     to generate/update vscode custom data files. See https://github.com/microsoft/vscode-custom-data/tree/main/samples/webcomponents
     *
     */
    /**
     * Copyright (c) 2022-2025 Julian Knight (Totally Information)
     * https://it.knightnet.org.uk, https://github.com/TotallyInformation
     *
     * Licensed under the Apache License, Version 2.0 (the 'License');
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     * http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an 'AS IS' BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    const componentName = 'simple-container'
    const className = 'SimpleContainer'

    const template = document.createElement('template')
    // TODO: Unpack & - & = parent selector, eg. &::after => .tree ul::after
    template.innerHTML = /*html*/`
        <style>
            :host {
                display: block;   /* default is inline */
                contain: content; /* performance boost */
            }
            .tree {
                @if $reverse {
                    transform: rotate(180deg);
                    transform-origin: 50%;
                }
            }

            .tree ul {
                position: relative;
                    padding: 1em 0;
                white-space: nowrap;
                margin: 0 auto;
                text-align: center;
                &::after {
                    content: '';
                    display: table;
                    clear: both;
                }
            }

            .tree li {
                display: inline-block; // need white-space fix
                vertical-align: top;
                text-align: center;
                    list-style-type: none;
                    position: relative;
                    padding: 1em .5em 0 .5em;
                &::before,
                &::after {
                    content: '';
                    position: absolute;
                    top: 0;
                    right: 50%;
                    border-top: $border-width solid #ccc;
                    width: 50%;
                    height: 1em;
                }
                &::after {
                    right: auto;
                    left: 50%;
                    border-left: $border-width solid #ccc;
                }
                &:only-child::after,
                &:only-child::before {
                    display: none;
                }
                &:only-child {
                    padding-top: 0;
                }
                &:first-child::before,
                &:last-child::after {
                    border: 0 none;
                }
                &:last-child::before{
                    border-right: $border-width solid #ccc;
                    border-radius: 0 5px 0 0;
                }
                &:first-child::after{
                    border-radius: 5px 0 0 0;
                }
            }

            .tree ul ul::before{
                content: '';
                position: absolute;
                top: 0;
                left: 50%;
                    border-left: $border-width solid #ccc;
                    width: 0;
                height: 1em;
            }

            .tree li a {
                border: $border-width solid #ccc;
                padding: .5em .75em;
                text-decoration: none;
                display: inline-block;
                border-radius: 5px;
                color: #333;
                position: relative;
                top: $border-width;
                @if $reverse {
                    transform: rotate(180deg);
                }
            }

            .tree li a:hover,
            .tree li a:hover+ul li a {
                background: #e9453f;
                color: #fff;
                border: $border-width solid #e9453f;
            }

            .tree li a:hover + ul li::after,
            .tree li a:hover + ul li::before,
            .tree li a:hover + ul::before,
            .tree li a:hover + ul ul::before{
                border-color:  #e9453f;
            }
        </style>
        <div class="tree">
            <ul>
                <li>
                    <a href="#">Parent</a>
                    <ul>
                    <li>
                        <a href="#">Child</a>
                        <ul>
                        <li>
                            <a href="#">Grand Child</a>
                        </li><li>
                            <a href="#">Grand Child</a>
                            <ul>
                            <li>
                                <a href="#">Grand Child</a>
                            </li><li>
                                <a href="#">Grand Child</a>
                            </li>
                            </ul>
                        </li>
                        </ul>
                    </li><li>
                        <a href="#">Child</a>
                        <ul>
                        <li>
                            <a href="#">Grand Child</a>
                            <ul>
                            <li>
                                <a href="#">Grand Grand Child</a>
                            </li>
                            </ul>
                        </li><li>
                            <a href="#">Grand Child</a>
                        </li>
                        </ul>
                    </li>
                    </ul>
                </li>
            </ul>
        </div>
        <slot></slot>
    `

    // Define the class and make it the default export
    /**
     * @element simple-container
     *
     * fires simple-container:construction - Document object event. evt.details contains the data
     * fires simple-container:connected - When an instance of the component is attached to the DOM. `evt.details` contains the details of the element.
     * fires simple-container:disconnected - When an instance of the component is removed from the DOM. `evt.details` contains the details of the element.
     * fires simple-container:attribChanged - When a watched attribute changes. `evt.details` contains the details of the change.
     * NOTE that listeners can be attached either to the `document` or to the specific element instance.
     *
     * @property {string} name - Optional. Will be used to synthesize an ID if no ID is provided.
     * attr {string} data-* - Optional. All data-* attributes are returned in the _meta prop as a _meta.data object.
     *
     * @slot Container contents
     *
     * @csspart ??? - Uses the uib-styles.css uibuilder master for variables where available.
     */
    export default class SimpleContainer extends HTMLElement {
        //#region ---- Class Variables ----

        /** Standard _ui object to include in msgs */
        _ui = {
            type: componentName,
            event: undefined,
            id: undefined,
            name: undefined,
            data: undefined, // All of the data-* attributes as an object
        }

        /** Mini jQuery-like shadow dom selector (see constructor) */
        $

        /** Holds the name for this instance of the component */
        name = undefined

        /** Holds a count of how many instances of this component are on the page */
        static _iCount = 0

        //#endregion ---- ---- ---- ----

        //#region ---- Utility Functions ----

        //#endregion ---- ---- ---- ----

        constructor() {

            super()
            this.attachShadow({ mode: 'open', delegatesFocus: true, })
                .append(template.content.cloneNode(true))

            this.$ = this.shadowRoot.querySelector.bind(this.shadowRoot)

            this.dispatchEvent(new Event(`${componentName}:construction`, { bubbles: true, composed: true, }))

        } // ---- end of constructor ----

        // List all attribs we want to observe
        static get observedAttributes() { return [
            'name'
        ] }

        // Runs when an observed attribute changes - Note: values are always strings
        attributeChangedCallback(name, oldVal, newVal) {

            // Don't bother if the new value same as old
            if ( oldVal === newVal ) return

            // Create a property from the value - WARN: Be careful with name clashes
            this[name] = newVal

            this.dispatchEvent(new CustomEvent(`${componentName}:attribChanged`, {
                bubbles: true,
                composed: true,
                detail: {
                    id: this.id,
                    name: this.name,
                    attribute: name,
                    newVal: newVal,
                    oldVal: oldVal,
                },
            } ) )

        } // --- end of attributeChangedCallback --- //

        // Runs when an instance is added to the DOM
        connectedCallback() {
            ++SimpleContainer._iCount // increment total instance count

            // Create an id from name or calculation if needed
            this.name = this.getAttribute('name')
            if (!this.id) {
                if (this.name) this.id = this.name.toLowerCase().replace(/\s/g, '_')
                else this.id = `sc-${SimpleContainer._iCount}`
            }

            this.dispatchEvent(new CustomEvent(`${componentName}:connected`, {
                bubbles: true,
                composed: true,
                detail: {
                    id: this.id,
                    name: this.name,
                },
            } ) )

        } // ---- end of connectedCallback ---- //

        // Runs when an instance is removed from the DOM
        disconnectedCallback() {
            // NB: Dont decrement SimpleCard._iCount because that could lead to id nameclashes

            this.dispatchEvent(new CustomEvent(`${componentName}:disconnected`, {
                bubbles: true,
                composed: true,
                detail: {
                    id: this.id,
                    name: this.name,
                },
            } ) )

        } // ---- end of disconnectedCallback ---- //

    } // ---- end of Class ---- //

    /** Self register the class to global
     * Enables new data lists to be dynamically added via JS
     * and lets the static methods be called
     */
    window[className] = SimpleContainer

    // Self-register the HTML tag
    customElements.define(componentName, SimpleContainer)