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{"version":3,"file":"subpanel.min.js","sources":["../../../src/local/action_menu/subpanel.js"],"sourcesContent":["// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Action menu subpanel JS controls.\n *\n * @module core/local/action_menu/subpanel\n * @copyright 2023 Mikel Martín <mikel@moodle.com>\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\n\nimport jQuery from 'jquery';\nimport {debounce} from 'core/utils';\nimport {\n isBehatSite,\n isExtraSmall,\n firstFocusableElement,\n lastFocusableElement,\n previousFocusableElement,\n nextFocusableElement,\n} from 'core/pagehelpers';\nimport Pending from 'core/pending';\nimport {\n hide,\n unhide,\n} from 'core/aria';\n\nconst Selectors = {\n mainMenu: '[role=\"menu\"]',\n dropdownRight: '.dropdown-menu-right',\n subPanel: '.dropdown-subpanel',\n subPanelMenuItem: '.dropdown-subpanel > .dropdown-item',\n subPanelContent: '.dropdown-subpanel > .dropdown-menu',\n // Drawer selector.\n drawer: '[data-region=\"fixed-drawer\"]',\n // Lateral blocks columns selectors.\n blockColumn: '.blockcolumn',\n columnLeft: '.columnleft',\n};\n\nconst Classes = {\n dropRight: 'dropright',\n dropLeft: 'dropleft',\n dropDown: 'dropdown',\n forceLeft: 'downleft',\n contentDisplayed: 'content-displayed',\n};\n\nconst BootstrapEvents = {\n hideDropdown: 'hidden.bs.dropdown',\n};\n\nlet initialized = false;\n\n/**\n * Initialize all delegated events into the page.\n */\nconst initPageEvents = () => {\n if (initialized) {\n return;\n }\n // Hide all subpanels when hidind a dropdown.\n // This is using JQuery because of BS4 events. JQuery won't be needed with BS5.\n jQuery(document).on(BootstrapEvents.hideDropdown, () => {\n document.querySelectorAll(`${Selectors.subPanelContent}.show`).forEach(visibleSubPanel => {\n const dropdownSubPanel = visibleSubPanel.closest(Selectors.subPanel);\n const subPanel = new SubPanel(dropdownSubPanel);\n subPanel.setVisibility(false);\n });\n });\n\n window.addEventListener('resize', debounce(updateAllPanelsPosition, 400));\n\n initialized = true;\n};\n\n/**\n * Update all the panels position.\n */\nconst updateAllPanelsPosition = () => {\n document.querySelectorAll(Selectors.subPanel).forEach(dropdown => {\n const subpanel = new SubPanel(dropdown);\n subpanel.updatePosition();\n });\n};\n\n/**\n * Subpanel class.\n * @private\n */\nclass SubPanel {\n /**\n * Constructor.\n * @param {HTMLElement} element The element to initialize.\n */\n constructor(element) {\n this.element = element;\n this.menuItem = element.querySelector(Selectors.subPanelMenuItem);\n this.panelContent = element.querySelector(Selectors.subPanelContent);\n /**\n * Enable preview when the menu item has focus.\n *\n * This is disabled when the user press ESC or shift+TAB to force closing\n *\n * @type {Boolean}\n * @private\n */\n this.showPreviewOnFocus = true;\n }\n\n /**\n * Initialize the subpanel element.\n *\n * This method adds the event listeners to the subpanel and the position classes.\n */\n init() {\n if (this.element.dataset.subPanelInitialized) {\n return;\n }\n\n this.updatePosition();\n\n // Full element events.\n this.element.addEventListener('focusin', this._mainElementFocusInHandler.bind(this));\n // Menu Item events.\n this.menuItem.addEventListener('click', this._menuItemClickHandler.bind(this));\n this.menuItem.addEventListener('keydown', this._menuItemKeyHandler.bind(this));\n if (!isBehatSite()) {\n // Behat in Chrome usually move the mouse over the page when trying clicking a subpanel element.\n // If the menu has more than one subpanel this could cause closing the subpanel by mistake.\n this.menuItem.addEventListener('mouseover', this._menuItemHoverHandler.bind(this));\n this.menuItem.addEventListener('mouseout', this._menuItemHoverOutHandler.bind(this));\n }\n // Subpanel content events.\n this.panelContent.addEventListener('keydown', this._panelContentKeyHandler.bind(this));\n\n this.element.dataset.subPanelInitialized = true;\n }\n\n /**\n * Checks if the subpanel has enough space.\n *\n * In general there are two scenarios were the subpanel must be interacted differently:\n * - Extra small screens: The subpanel is displayed below the menu item.\n * - Drawer: The subpanel is displayed one of the drawers.\n * - Block columns: for classic based themes.\n *\n * @returns {Boolean} true if the subpanel should be displayed in small screens.\n */\n _needSmallSpaceBehaviour() {\n return isExtraSmall() ||\n this.element.closest(Selectors.drawer) !== null ||\n this.element.closest(Selectors.blockColumn) !== null;\n }\n\n /**\n * Check if the subpanel should be displayed on the right.\n *\n * This is defined by the drop right boostrap class. However, if the menu is\n * displayed in a block column on the right, the subpanel should be forced\n * to the right.\n *\n * @returns {Boolean} true if the subpanel should be displayed on the right.\n */\n _needDropdownRight() {\n if (this.element.closest(Selectors.columnLeft) !== null) {\n return false;\n }\n return this.element.closest(Selectors.dropdownRight) !== null;\n }\n\n /**\n * Main element focus in handler.\n */\n _mainElementFocusInHandler() {\n if (this._needSmallSpaceBehaviour() || !this.showPreviewOnFocus) {\n // Preview is disabled when the user press ESC or shift+TAB to force closing\n // but if the continue navigating with keyboard the preview is enabled again.\n this.showPreviewOnFocus = true;\n return;\n }\n this.setVisibility(true);\n }\n\n /**\n * Menu item click handler.\n * @param {Event} event\n */\n _menuItemClickHandler(event) {\n // Avoid dropdowns being closed after clicking a subemnu.\n // This won't be needed with BS5 (data-bs-auto-close handles it).\n event.stopPropagation();\n event.preventDefault();\n if (this._needSmallSpaceBehaviour()) {\n this.setVisibility(!this.getVisibility());\n }\n }\n\n /**\n * Menu item hover handler.\n * @private\n */\n _menuItemHoverHandler() {\n if (this._needSmallSpaceBehaviour()) {\n return;\n }\n this.setVisibility(true);\n }\n\n /**\n * Menu item hover out handler.\n * @private\n */\n _menuItemHoverOutHandler() {\n if (this._needSmallSpaceBehaviour()) {\n return;\n }\n this._hideOtherSubPanels();\n }\n\n /**\n * Menu item key handler.\n * @param {Event} event\n * @private\n */\n _menuItemKeyHandler(event) {\n // In small sizes te down key will focus on the panel.\n if (event.key === 'ArrowUp' || (event.key === 'ArrowDown' && !this._needSmallSpaceBehaviour())) {\n this.setVisibility(false);\n return;\n }\n\n // Keys to move focus to the panel.\n let focusPanel = false;\n\n if (event.key === 'ArrowRight' || event.key === 'ArrowLeft' || (event.key === 'Tab' && !event.shiftKey)) {\n focusPanel = true;\n }\n if ((event.key === 'Enter' || event.key === ' ')) {\n focusPanel = true;\n }\n // In extra small screen the panel is shown below the item.\n if (event.key === 'ArrowDown' && this._needSmallSpaceBehaviour() && this.getVisibility()) {\n focusPanel = true;\n }\n if (focusPanel) {\n event.stopPropagation();\n event.preventDefault();\n this.setVisibility(true);\n this._focusPanelContent();\n }\n\n }\n\n /**\n * Sub panel content key handler.\n * @param {Event} event\n * @private\n */\n _panelContentKeyHandler(event) {\n // In extra small devices the panel is displayed under the menu item\n // so the arrow up/down switch between subpanel and the menu item.\n const canLoop = !this._needSmallSpaceBehaviour();\n let isBrowsingSubPanel = false;\n let newFocus = null;\n if (event.key === 'ArrowRight' || event.key === 'ArrowLeft') {\n newFocus = this.menuItem;\n }\n // Acording to WCAG Esc and Tab are similar to arrow navigation but they\n // force the subpanel to be closed.\n if (event.key === 'Escape' || (event.key === 'Tab' && event.shiftKey)) {\n newFocus = this.menuItem;\n this.setVisibility(false);\n this.showPreviewOnFocus = false;\n }\n if (event.key === 'ArrowUp') {\n newFocus = previousFocusableElement(this.panelContent, canLoop);\n isBrowsingSubPanel = true;\n }\n if (event.key === 'ArrowDown') {\n newFocus = nextFocusableElement(this.panelContent, canLoop);\n isBrowsingSubPanel = true;\n }\n if (event.key === 'Home') {\n newFocus = firstFocusableElement(this.panelContent);\n isBrowsingSubPanel = true;\n }\n if (event.key === 'End') {\n newFocus = lastFocusableElement(this.panelContent);\n isBrowsingSubPanel = true;\n }\n // If the user cannot loop and arrive to the start/end of the subpanel\n // we focus on the menu item.\n if (newFocus === null && isBrowsingSubPanel && !canLoop) {\n newFocus = this.menuItem;\n }\n if (newFocus !== null) {\n event.stopPropagation();\n event.preventDefault();\n newFocus.focus();\n }\n }\n\n /**\n * Focus on the first focusable element of the subpanel.\n * @private\n */\n _focusPanelContent() {\n const pendingPromise = new Pending('core/action_menu/subpanel:focuscontent');\n // Some Bootstrap events are triggered after the click event.\n // To prevent this from affecting the focus we wait a bit.\n setTimeout(() => {\n const firstFocusable = firstFocusableElement(this.panelContent);\n if (firstFocusable) {\n firstFocusable.focus();\n }\n pendingPromise.resolve();\n }, 100);\n }\n\n /**\n * Set the visibility of a subpanel.\n * @param {Boolean} visible true if the subpanel should be visible.\n */\n setVisibility(visible) {\n if (visible) {\n this._hideOtherSubPanels();\n }\n // Aria hidden/unhidden can alter the focus, we only want to do it when needed.\n if (!visible && this.getVisibility) {\n hide(this.panelContent);\n }\n if (visible && !this.getVisibility) {\n unhide(this.panelContent);\n }\n this.menuItem.setAttribute('aria-expanded', visible ? 'true' : 'false');\n this.panelContent.classList.toggle('show', visible);\n this.element.classList.toggle(Classes.contentDisplayed, visible);\n }\n\n /**\n * Hide all other subpanels in the parent menu.\n * @private\n */\n _hideOtherSubPanels() {\n const dropdown = this.element.closest(Selectors.mainMenu);\n dropdown.querySelectorAll(`${Selectors.subPanelContent}.show`).forEach(visibleSubPanel => {\n const dropdownSubPanel = visibleSubPanel.closest(Selectors.subPanel);\n if (dropdownSubPanel === this.element) {\n return;\n }\n const subPanel = new SubPanel(dropdownSubPanel);\n subPanel.setVisibility(false);\n });\n }\n\n /**\n * Get the visibility of a subpanel.\n * @returns {Boolean} true if the subpanel is visible.\n */\n getVisibility() {\n return this.menuItem.getAttribute('aria-expanded') === 'true';\n }\n\n /**\n * Update the panels position depending on the screen size and panel position.\n */\n updatePosition() {\n const dropdownRight = this._needDropdownRight();\n if (this._needSmallSpaceBehaviour()) {\n this.element.classList.remove(Classes.dropRight);\n this.element.classList.remove(Classes.dropLeft);\n this.element.classList.add(Classes.dropDown);\n this.element.classList.toggle(Classes.forceLeft, dropdownRight);\n return;\n }\n this.element.classList.remove(Classes.dropDown);\n this.element.classList.remove(Classes.forceLeft);\n this.element.classList.toggle(Classes.dropRight, !dropdownRight);\n this.element.classList.toggle(Classes.dropLeft, dropdownRight);\n }\n}\n\n/**\n * Initialise module for given report\n *\n * @method\n * @param {string} selector The query selector to init.\n */\nexport const init = (selector) => {\n initPageEvents();\n const subMenu = document.querySelector(selector);\n if (!subMenu) {\n throw new Error(`Sub panel element not found: ${selector}`);\n }\n const subPanel = new SubPanel(subMenu);\n 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