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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 {end, arrowUp, arrowDown, arrowLeft, arrowRight, home, enter, space} from 'core\/key_codes';\nimport $ from 'jquery';\nimport Pending from 'core\/pending';\n\n\/**\n * Drop downs from bootstrap don't support keyboard accessibility by default.\n *\/\nconst dropdownFix = () => {\n    let focusEnd = false;\n    const setFocusEnd = () => {\n        focusEnd = true;\n    };\n    const getFocusEnd = () => {\n        const result = focusEnd;\n        focusEnd = false;\n        return result;\n    };\n\n    \/\/ Special handling for \"up\" keyboard control.\n    document.addEventListener('keydown', e => {\n        if (e.target.matches('[data-toggle=\"dropdown\"]')) {\n            const trigger = e.which;\n\n            \/\/ Up key opens the menu at the end.\n            if (trigger == arrowUp) {\n                \/\/ Focus the end of the menu, not the beginning.\n                setFocusEnd();\n            }\n\n            \/\/ Space key or Enter key opens the menu.\n            if (trigger == space || trigger == enter) {\n                \/\/ Cancel random scroll.\n                e.preventDefault();\n                \/\/ Open the menu instead.\n                e.target.click();\n            }\n        }\n    });\n\n    \/\/ Special handling for navigation keys when menu is open.\n    const shiftFocus = element => {\n        const delayedFocus = pendingPromise => {\n            element.focus();\n            pendingPromise.resolve();\n        };\n        setTimeout(delayedFocus, 50, new Pending('core\/aria:delayed-focus'));\n    };\n\n    $('.dropdown').on('shown.bs.dropdown', e => {\n        \/\/ We need to focus on the first menuitem.\n        const menu = e.target.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            if (getFocusEnd()) {\n                foundMenuItem = menuItems[menuItems.length - 1];\n            } else {\n                \/\/ The first menu entry, pretty reasonable.\n                foundMenuItem = menuItems[0];\n            }\n        }\n        if (foundMenuItem) {\n            shiftFocus(foundMenuItem);\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 trigger = String.fromCharCode(e.which).toLowerCase();\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\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        if (e.target.matches('.dropdown [role=\"menu\"] [role=\"menuitem\"]')) {\n            const trigger = e.which;\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\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\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            \/\/ 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('hidden.bs.dropdown', e => {\n        \/\/ We need to focus on the menu trigger.\n        const trigger = e.target.querySelector('[data-toggle=\"dropdown\"]');\n        if (trigger) {\n            shiftFocus(trigger);\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 => getComputedStyle(tab).display !== 'none'); \/\/ 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.keyCode) {\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            break;\n        case enter:\n        case space:\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 * 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, enter, space].includes(e.keyCode)) {\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\"] [role=\"tab\"]')) {\n            const tabs = e.target.closest('[role=\"tablist\"]').querySelectorAll('[role=\"tab\"]');\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\nexport const init = () => {\n    dropdownFix();\n    autoFocus();\n    tabElementFix();\n};\n"],"file":"aria.min.js"}