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{"version":3,"file":"aria.min.js","sources":["../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_monocolor/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';\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        let textInput = false;\n\n        if (menu) {\n            menuItems = menu.querySelectorAll('[role=\"menuitem\"]');\n            textInput = e.target.parentElement.querySelector('[data-action=\"search\"]');\n        }\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 (textInput) {\n            shiftFocus(textInput);\n        }\n        if (foundMenuItem && textInput === null) {\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('hidden.bs.dropdown', e => {\n        // We need to focus on the menu trigger.\n        const trigger = e.target.querySelector('[data-toggle=\"dropdown\"]');\n        const focused = 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') {\n                    next = options[0];\n                } else if (trigger == 'End') {\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                combobox.focus();\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 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'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        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