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✏️ Editing: cm.js

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Course index cm component.
 *
 * This component is used to control specific course modules interactions like drag and drop.
 *
 * @module     core_courseformat/local/courseindex/cm
 * @class      core_courseformat/local/courseindex/cm
 * @copyright  2021 Ferran Recio <ferran@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

import DndCmItem from 'core_courseformat/local/courseeditor/dndcmitem';
import Templates from 'core/templates';
import Prefetch from 'core/prefetch';
import Config from 'core/config';

// Prefetch the completion icons template.
const completionTemplate = 'core_courseformat/local/courseindex/cmcompletion';
Prefetch.prefetchTemplate(completionTemplate);

export default class Component extends DndCmItem {

/**
     * Constructor hook.
     */
    create() {
        // Optional component name for debugging.
        this.name = 'courseindex_cm';
        // Default query selectors.
        this.selectors = {
            CM_NAME: `[data-for='cm_name']`,
            CM_COMPLETION: `[data-for='cm_completion']`,
        };
        // Default classes to toggle on refresh.
        this.classes = {
            CMHIDDEN: 'dimmed',
            LOCKED: 'editinprogress',
            RESTRICTIONS: 'restrictions',
            PAGEITEM: 'pageitem',
            INDENTED: 'indented',
        };
        // We need our id to watch specific events.
        this.id = this.element.dataset.id;
    }

/**
     * Static method to create a component instance form the mustache template.
     *
     * @param {element|string} target the DOM main element or its ID
     * @param {object} selectors optional css selector overrides
     * @return {Component}
     */
    static init(target, selectors) {
        return new this({
            element: document.getElementById(target),
            selectors,
        });
    }

/**
     * Initial state ready method.
     *
     * @param {Object} state the course state.
     */
    stateReady(state) {
        this.configDragDrop(this.id);
        const cm = state.cm.get(this.id);
        const course = state.course;
        // Refresh completion icon.
        this._refreshCompletion({
            state,
            element: cm,
        });
        const url = new URL(window.location.href);
        const anchor = url.hash.replace('#', '');
        // Check if the current url is the cm url.
        if (window.location.href == cm.url
            || (window.location.href.includes(course.baseurl) && anchor == cm.anchor)
        ) {
            this.reactive.dispatch('setPageItem', 'cm', this.id);
            this.element.scrollIntoView({block: "center"});
        }
        // Check if this we are displaying this activity page.
        if (Config.contextid != Config.courseContextId && Config.contextInstanceId == this.id) {
            this.reactive.dispatch('setPageItem', 'cm', this.id, true);
            this.element.scrollIntoView({block: "center"});
        }
        // Add anchor logic if the element is not user visible or the element hasn't URL.
        if (!cm.uservisible || !cm.url) {
            this.addEventListener(
                this.getElement(this.selectors.CM_NAME),
                'click',
                this._activityAnchor,
            );
        }
    }

/**
     * Component watchers.
     *
     * @returns {Array} of watchers
     */
    getWatchers() {
        return [
            {watch: `cm[${this.id}]:deleted`, handler: this.remove},
            {watch: `cm[${this.id}]:updated`, handler: this._refreshCm},
            {watch: `cm[${this.id}].completionstate:updated`, handler: this._refreshCompletion},
            {watch: `course.pageItem:updated`, handler: this._refreshPageItem},
        ];
    }

/**
     * Update a course index cm using the state information.
     *
     * @param {object} param
     * @param {Object} param.element details the update details.
     */
    _refreshCm({element}) {
        // Update classes.
        this.element.classList.toggle(this.classes.CMHIDDEN, !element.visible);
        this.getElement(this.selectors.CM_NAME).innerHTML = element.name;
        this.element.classList.toggle(this.classes.DRAGGING, element.dragging ?? false);
        this.element.classList.toggle(this.classes.LOCKED, element.locked ?? false);
        this.element.classList.toggle(this.classes.RESTRICTIONS, element.hascmrestrictions ?? false);
        this.element.classList.toggle(this.classes.INDENTED, element.indent);
        this.locked = element.locked;
    }

/**
     * Handle a page item update.
     *
     * @param {Object} details the update details
     * @param {Object} details.element the course state data.
     */
    _refreshPageItem({element}) {
        if (!element.pageItem) {
            return;
        }
        const isPageId = (element.pageItem.type == 'cm' && element.pageItem.id == this.id);
        this.element.classList.toggle(this.classes.PAGEITEM, isPageId);
        if (isPageId && !this.reactive.isEditing) {
            this.element.scrollIntoView({block: "nearest"});
        }
    }

/**
     * Update the activity completion icon.
     *
     * @param {Object} details the update details
     * @param {Object} details.state the state data
     * @param {Object} details.element the element data
     */
    async _refreshCompletion({state, element}) {
        // No completion icons are displayed in edit mode.
        if (this.reactive.isEditing || !element.istrackeduser) {
            return;
        }
        // Check if the completion value has changed.
        const completionElement = this.getElement(this.selectors.CM_COMPLETION);
        if (completionElement.dataset.value == element.completionstate) {
            return;
        }

// Collect section information from the state.
        const exporter = this.reactive.getExporter();
        const data = exporter.cmCompletion(state, element);

const {html, js} = await Templates.renderForPromise(completionTemplate, data);
        Templates.replaceNode(completionElement, html, js);
    }

/**
     * The activity anchor event.
     *
     * @param {Event} event
     */
    _activityAnchor(event) {
        const cm = this.reactive.get('cm', this.id);
        // If the user cannot access the element but the element is present in the page
        // the new url should be an anchor link.
        const element = document.getElementById(cm.anchor);
        if (element) {
            // Make sure the section is expanded.
            this.reactive.dispatch('sectionContentCollapsed', [cm.sectionid], false);
            // Marc the element as page item once the event is handled.
            setTimeout(() => {
                this.reactive.dispatch('setPageItem', 'cm', cm.id);
            }, 50);
            return;
        }
        // If the element is not present in the page we need to go to the specific section.
        const course = this.reactive.get('course');
        const section = this.reactive.get('section', cm.sectionid);
        if (!section) {
            return;
        }
        const url = `${course.baseurl}&section=${section.number}#${cm.anchor}`;
        event.preventDefault();
        window.location = url;
    }
}

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