{"version":3,"file":"aria.min.js","sources":["https:\/\/dl1.cuni.cz\/theme\/boost\/amd\/src\/aria.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 * Enhancements to Bootstrap components for accessibility.\n *\n * @module     theme_boost\/aria\n * @copyright  2018 Damyon Wiese <damyon@moodle.com>\n * @license    http:\/\/www.gnu.org\/copyleft\/gpl.html GNU GPL v3 or later\n *\/\n\nimport $ from 'jquery';\nimport Pending from 'core\/pending';\nimport * as FocusLockManager from 'core\/local\/aria\/focuslock';\n\n\/**\n * Drop downs from bootstrap don't support keyboard accessibility by default.\n *\/\nconst dropdownFix = () => {\n    let focusEnd = false;\n    const setFocusEnd = (end = true) => {\n        focusEnd = end;\n    };\n    const getFocusEnd = () => {\n        const result = focusEnd;\n        focusEnd = false;\n        return result;\n    };\n\n    \/\/ Special handling for navigation keys when menu is open.\n    const shiftFocus = (element, focusCheck = null) => {\n        const pendingPromise = new Pending('core\/aria:delayed-focus');\n        setTimeout(() => {\n            if (!focusCheck || focusCheck()) {\n                element.focus();\n            }\n\n            pendingPromise.resolve();\n        }, 50);\n    };\n\n    \/\/ Event handling for the dropdown menu button.\n    const handleMenuButton = e => {\n        const trigger = e.key;\n        let fixFocus = false;\n\n        \/\/ Space key or Enter key opens the menu.\n        if (trigger === ' ' || trigger === 'Enter') {\n            fixFocus = true;\n            \/\/ Cancel random scroll.\n            e.preventDefault();\n            \/\/ Open the menu instead.\n            e.target.click();\n        }\n\n        \/\/ Up and Down keys also open the menu.\n        if (trigger === 'ArrowUp' || trigger === 'ArrowDown') {\n            fixFocus = true;\n        }\n\n        if (!fixFocus) {\n            \/\/ No need to fix the focus. Return early.\n            return;\n        }\n\n        \/\/ Fix the focus on the menu items when the menu is opened.\n        const menu = e.target.parentElement.querySelector('[role=\"menu\"]');\n        let menuItems = false;\n        let foundMenuItem = false;\n\n        if (menu) {\n            menuItems = menu.querySelectorAll('[role=\"menuitem\"]');\n        }\n        if (menuItems && menuItems.length > 0) {\n            \/\/ Up key opens the menu at the end.\n            if (trigger === 'ArrowUp') {\n                setFocusEnd();\n            } else {\n                setFocusEnd(false);\n            }\n\n            if (getFocusEnd()) {\n                foundMenuItem = menuItems[menuItems.length - 1];\n            } else {\n                \/\/ The first menu entry, pretty reasonable.\n                foundMenuItem = menuItems[0];\n            }\n        }\n\n        if (foundMenuItem) {\n            shiftFocus(foundMenuItem);\n        }\n    };\n\n    \/\/ Search for menu items by finding the first item that has\n    \/\/ text starting with the typed character (case insensitive).\n    document.addEventListener('keypress', e => {\n        if (e.target.matches('.dropdown [role=\"menu\"] [role=\"menuitem\"]')) {\n            const menu = e.target.closest('[role=\"menu\"]');\n            if (!menu) {\n                return;\n            }\n            const menuItems = menu.querySelectorAll('[role=\"menuitem\"]');\n            if (!menuItems) {\n                return;\n            }\n\n            const trigger = e.key.toLowerCase();\n\n            for (let i = 0; i < menuItems.length; i++) {\n                const item = menuItems[i];\n                const itemText = item.text.trim().toLowerCase();\n                if (itemText.indexOf(trigger) == 0) {\n                    shiftFocus(item);\n                    break;\n                }\n            }\n        }\n    });\n\n    \/\/ Keyboard navigation for arrow keys, home and end keys.\n    document.addEventListener('keydown', e => {\n\n        \/\/ We only want to set focus when users access the dropdown via keyboard as per\n        \/\/ guidelines defined in w3 aria practices 1.1 menu-button.\n        if (e.target.matches('[data-toggle=\"dropdown\"]')) {\n            handleMenuButton(e);\n        }\n\n        if (e.target.matches('.dropdown [role=\"menu\"] [role=\"menuitem\"]')) {\n            const trigger = e.key;\n            let next = false;\n            const menu = e.target.closest('[role=\"menu\"]');\n\n            if (!menu) {\n                return;\n            }\n            const menuItems = menu.querySelectorAll('[role=\"menuitem\"]');\n            if (!menuItems) {\n                return;\n            }\n            \/\/ Down key.\n            if (trigger == 'ArrowDown') {\n                for (let i = 0; i < menuItems.length - 1; i++) {\n                    if (menuItems[i] == e.target) {\n                        next = menuItems[i + 1];\n                        break;\n                    }\n                }\n                if (!next) {\n                    \/\/ Wrap to first item.\n                    next = menuItems[0];\n                }\n            } else if (trigger == 'ArrowUp') {\n                \/\/ Up key.\n                for (let i = 1; i < menuItems.length; i++) {\n                    if (menuItems[i] == e.target) {\n                        next = menuItems[i - 1];\n                        break;\n                    }\n                }\n                if (!next) {\n                    \/\/ Wrap to last item.\n                    next = menuItems[menuItems.length - 1];\n                }\n            } else if (trigger == 'Home') {\n                \/\/ Home key.\n                next = menuItems[0];\n\n            } else if (trigger == 'End') {\n                \/\/ End key.\n                next = menuItems[menuItems.length - 1];\n            }\n\n            \/\/ Variable next is set if we do want to act on the keypress.\n            if (next) {\n                e.preventDefault();\n                shiftFocus(next);\n            }\n            return;\n        }\n    });\n\n    $('.dropdown').on('shown.bs.dropdown', e => {\n        const dialog = e.target.querySelector(`#${e.relatedTarget.getAttribute('aria-controls')}[role=\"dialog\"]`);\n        if (dialog) {\n            \/\/ Use setTimeout to make sure the dialog is positioned correctly to prevent random scrolling.\n            setTimeout(() => {\n                FocusLockManager.trapFocus(dialog);\n            });\n        }\n    });\n\n    $('.dropdown').on('hidden.bs.dropdown', e => {\n        const dialog = e.target.querySelector(`#${e.relatedTarget.getAttribute('aria-controls')}[role=\"dialog\"]`);\n        if (dialog) {\n            FocusLockManager.untrapFocus();\n        }\n\n        \/\/ We need to focus on the menu trigger.\n        const trigger = e.target.querySelector('[data-toggle=\"dropdown\"]');\n        \/\/ If it's a click event, then no element is focused because the clicked element is inside a closed dropdown.\n        const focused = e.clickEvent?.target || (document.activeElement !== document.body ? document.activeElement : null);\n        if (trigger && focused && e.target.contains(focused)) {\n            shiftFocus(trigger, () => {\n                if (document.activeElement === document.body) {\n                    \/\/ If the focus is currently on the body, then we can safely assume that the focus needs to be updated.\n                    return true;\n                }\n\n                \/\/ If the focus is on a child of the clicked element still, then update the focus.\n                return e.target.contains(document.activeElement);\n            });\n        }\n    });\n};\n\n\/**\n * A lot of Bootstrap's out of the box features don't work if dropdown items are not focusable.\n *\/\nconst comboboxFix = () => {\n    $(document).on('show.bs.dropdown', e => {\n        if (e.relatedTarget.matches('[role=\"combobox\"]')) {\n            const combobox = e.relatedTarget;\n            const listbox = document.querySelector(`#${combobox.getAttribute('aria-controls')}[role=\"listbox\"]`);\n\n            if (listbox) {\n                const selectedOption = listbox.querySelector('[role=\"option\"][aria-selected=\"true\"]');\n\n                \/\/ To make sure ArrowDown doesn't move the active option afterwards.\n                setTimeout(() => {\n                    if (selectedOption) {\n                        selectedOption.classList.add('active');\n                        combobox.setAttribute('aria-activedescendant', selectedOption.id);\n                    } else {\n                        const firstOption = listbox.querySelector('[role=\"option\"]');\n                        firstOption.setAttribute('aria-selected', 'true');\n                        firstOption.classList.add('active');\n                        combobox.setAttribute('aria-activedescendant', firstOption.id);\n                    }\n                }, 0);\n            }\n        }\n    });\n\n    $(document).on('hidden.bs.dropdown', e => {\n        if (e.relatedTarget.matches('[role=\"combobox\"]')) {\n            const combobox = e.relatedTarget;\n            const listbox = document.querySelector(`#${combobox.getAttribute('aria-controls')}[role=\"listbox\"]`);\n\n            combobox.removeAttribute('aria-activedescendant');\n\n            if (listbox) {\n                setTimeout(() => {\n                    \/\/ Undo all previously highlighted options.\n                    listbox.querySelectorAll('.active[role=\"option\"]').forEach(option => {\n                        option.classList.remove('active');\n                    });\n                }, 0);\n            }\n        }\n    });\n\n    \/\/ Handling keyboard events for both navigating through and selecting options.\n    document.addEventListener('keydown', e => {\n        if (e.target.matches('[role=\"combobox\"][aria-controls]:not([aria-haspopup=dialog])')) {\n            const combobox = e.target;\n            const trigger = e.key;\n            let next = null;\n            const listbox = document.querySelector(`#${combobox.getAttribute('aria-controls')}[role=\"listbox\"]`);\n            const options = listbox.querySelectorAll('[role=\"option\"]');\n            const activeOption = listbox.querySelector('.active[role=\"option\"]');\n            const editable = combobox.hasAttribute('aria-autocomplete');\n\n            \/\/ Under the special case that the dropdown menu is being shown as a result of the key press (like when the user\n            \/\/ presses ArrowDown or Enter or ... to open the dropdown menu), activeOption is not set yet.\n            \/\/ It's because of a race condition with show.bs.dropdown event handler.\n            if (options && (activeOption || editable)) {\n                if (trigger == 'ArrowDown') {\n                    for (let i = 0; i < options.length - 1; i++) {\n                        if (options[i] == activeOption) {\n                            next = options[i + 1];\n                            break;\n                        }\n                    }\n                    if (editable && !next) {\n                        next = options[0];\n                    }\n                } if (trigger == 'ArrowUp') {\n                    for (let i = 1; i < options.length; i++) {\n                        if (options[i] == activeOption) {\n                            next = options[i - 1];\n                            break;\n                        }\n                    }\n                    if (editable && !next) {\n                        next = options[options.length - 1];\n                    }\n                } else if (trigger == 'Home' && !editable) {\n                    next = options[0];\n                } else if (trigger == 'End' && !editable) {\n                    next = options[options.length - 1];\n                } else if ((trigger == ' ' && !editable) || trigger == 'Enter') {\n                    e.preventDefault();\n                    selectOption(combobox, activeOption);\n                } else if (!editable) {\n                    \/\/ Search for options by finding the first option that has\n                    \/\/ text starting with the typed character (case insensitive).\n                    for (let i = 0; i < options.length; i++) {\n                        const option = options[i];\n                        const optionText = option.textContent.trim().toLowerCase();\n                        const keyPressed = e.key.toLowerCase();\n                        if (optionText.indexOf(keyPressed) == 0) {\n                            next = option;\n                            break;\n                        }\n                    }\n                }\n\n                \/\/ Variable next is set if we do want to act on the keypress.\n                if (next) {\n                    e.preventDefault();\n                    if (activeOption) {\n                        activeOption.classList.remove('active');\n                    }\n                    next.classList.add('active');\n                    combobox.setAttribute('aria-activedescendant', next.id);\n                    next.scrollIntoView({block: 'nearest'});\n                }\n            }\n        }\n    });\n\n    document.addEventListener('click', e => {\n        const option = e.target.closest('[role=\"listbox\"] [role=\"option\"]');\n        if (option) {\n            const listbox = option.closest('[role=\"listbox\"]');\n            const combobox = document.querySelector(`[role=\"combobox\"][aria-controls=\"${listbox.id}\"]`);\n            if (combobox) {\n                selectOption(combobox, option);\n            }\n        }\n    });\n\n    \/\/ In case some code somewhere else changes the value of the combobox.\n    document.addEventListener('change', e => {\n        if (e.target.matches('input[type=\"hidden\"][id]')) {\n            const combobox = document.querySelector(`[role=\"combobox\"][data-input-element=\"${e.target.id}\"]`);\n            const option = e.target.parentElement.querySelector(`[role=\"option\"][data-value=\"${e.target.value}\"]`);\n\n            if (combobox && option) {\n                selectOption(combobox, option);\n            }\n        }\n    });\n\n    const selectOption = (combobox, option) => {\n        const listbox = option.closest('[role=\"listbox\"]');\n        const oldSelectedOption = listbox.querySelector('[role=\"option\"][aria-selected=\"true\"]');\n\n        if (oldSelectedOption != option) {\n            if (oldSelectedOption) {\n                oldSelectedOption.removeAttribute('aria-selected');\n            }\n            option.setAttribute('aria-selected', 'true');\n        }\n\n        if (combobox.hasAttribute('value')) {\n            combobox.value = option.dataset.shortText || option.textContent.replace(\/[\\n\\r]+|[\\s]{2,}\/g, ' ').trim();\n        } else {\n            combobox.textContent = option.dataset.shortText || option.textContent;\n        }\n\n        if (combobox.dataset.inputElement) {\n            const inputElement = document.getElementById(combobox.dataset.inputElement);\n            if (inputElement && (inputElement.value != option.dataset.value)) {\n                inputElement.value = option.dataset.value;\n                inputElement.dispatchEvent(new Event('change', {bubbles: true}));\n            }\n        }\n    };\n};\n\n\/**\n * After page load, focus on any element with special autofocus attribute.\n *\/\nconst autoFocus = () => {\n    window.addEventListener(\"load\", () => {\n        const alerts = document.querySelectorAll('[data-aria-autofocus=\"true\"][role=\"alert\"]');\n        Array.prototype.forEach.call(alerts, autofocusElement => {\n            \/\/ According to the specification an role=\"alert\" region is only read out on change to the content\n            \/\/ of that region.\n            autofocusElement.innerHTML += ' ';\n            autofocusElement.removeAttribute('data-aria-autofocus');\n        });\n    });\n};\n\n\/**\n * Changes the focus to the correct tab based on the key that is pressed.\n * @param {KeyboardEvent} e\n *\/\nconst updateTabFocus = e => {\n    const tabList = e.target.closest('[role=\"tablist\"]');\n    const vertical = tabList.getAttribute('aria-orientation') == 'vertical';\n    const rtl = window.right_to_left();\n    const arrowNext = vertical ? 'ArrowDown' : (rtl ? 'ArrowLeft' : 'ArrowRight');\n    const arrowPrevious = vertical ? 'ArrowUp' : (rtl ? 'ArrowRight' : 'ArrowLeft');\n    const tabs = Array.prototype.filter.call(\n        tabList.querySelectorAll('[role=\"tab\"]'),\n        tab => !!tab.offsetHeight); \/\/ We only work with the visible tabs.\n\n    for (let i = 0; i < tabs.length; i++) {\n        tabs[i].index = i;\n    }\n\n    switch (e.key) {\n        case arrowNext:\n            e.preventDefault();\n            if (e.target.index !== undefined && tabs[e.target.index + 1]) {\n                tabs[e.target.index + 1].focus();\n            } else {\n                tabs[0].focus();\n            }\n            break;\n        case arrowPrevious:\n            e.preventDefault();\n            if (e.target.index !== undefined && tabs[e.target.index - 1]) {\n                tabs[e.target.index - 1].focus();\n            } else {\n                tabs[tabs.length - 1].focus();\n            }\n            break;\n        case 'Home':\n            e.preventDefault();\n            tabs[0].focus();\n            break;\n        case 'End':\n            e.preventDefault();\n            tabs[tabs.length - 1].focus();\n    }\n};\n\n\/**\n * Fix accessibility issues regarding tab elements focus and their tab order in Bootstrap navs.\n *\/\nconst tabElementFix = () => {\n    document.addEventListener('keydown', e => {\n        if (['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight', 'Home', 'End'].includes(e.key)) {\n            if (e.target.matches('[role=\"tablist\"] [role=\"tab\"]')) {\n                updateTabFocus(e);\n            }\n        }\n    });\n\n    document.addEventListener('click', e => {\n        if (e.target.matches('[role=\"tablist\"] [data-toggle=\"tab\"], [role=\"tablist\"] [data-toggle=\"pill\"]')) {\n            const tabs = e.target.closest('[role=\"tablist\"]').querySelectorAll('[data-toggle=\"tab\"], [data-toggle=\"pill\"]');\n            e.preventDefault();\n            $(e.target).tab('show');\n            tabs.forEach(tab => {\n                tab.tabIndex = -1;\n            });\n            e.target.tabIndex = 0;\n        }\n    });\n};\n\n\/**\n * Fix keyboard interaction with Bootstrap Collapse elements.\n *\n * @see {@link https:\/\/www.w3.org\/TR\/wai-aria-practices-1.1\/#disclosure|WAI-ARIA Authoring Practices 1.1 - Disclosure (Show\/Hide)}\n *\/\nconst collapseFix = () => {\n    document.addEventListener('keydown', e => {\n        if (e.target.matches('[data-toggle=\"collapse\"]')) {\n            \/\/ Pressing space should toggle expand\/collapse.\n            if (e.key === ' ') {\n                e.preventDefault();\n                e.target.click();\n            }\n        }\n    });\n};\n\nexport const init = () => {\n    dropdownFix();\n    comboboxFix();\n    autoFocus();\n    tabElementFix();\n    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