{"version":3,"file":"custom_interaction_events.min.js","sources":["https:\/\/lms.innovativelearning.eu\/lib\/amd\/src\/custom_interaction_events.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 * This module provides a wrapper to encapsulate a lot of the common combinations of\n * user interaction we use in Moodle.\n *\n * @module     core\/custom_interaction_events\n * @copyright  2016 Ryan Wyllie <ryan@moodle.com>\n * @license    http:\/\/www.gnu.org\/copyleft\/gpl.html GNU GPL v3 or later\n * @since      3.2\n *\/\ndefine(['jquery', 'core\/key_codes'], function($, keyCodes) {\n    \/\/ The list of events provided by this module. Namespaced to avoid clashes.\n    var events = {\n        activate: 'cie:activate',\n        keyboardActivate: 'cie:keyboardactivate',\n        escape: 'cie:escape',\n        down: 'cie:down',\n        up: 'cie:up',\n        home: 'cie:home',\n        end: 'cie:end',\n        next: 'cie:next',\n        previous: 'cie:previous',\n        asterix: 'cie:asterix',\n        scrollLock: 'cie:scrollLock',\n        scrollTop: 'cie:scrollTop',\n        scrollBottom: 'cie:scrollBottom',\n        ctrlPageUp: 'cie:ctrlPageUp',\n        ctrlPageDown: 'cie:ctrlPageDown',\n        enter: 'cie:enter',\n        accessibleChange: 'cie:accessibleChange',\n    };\n    \/\/ Static cache of jQuery events that have been handled. This should\n    \/\/ only be populated by JavaScript generated events (which will keep it\n    \/\/ fairly small).\n    var triggeredEvents = {};\n\n    \/**\n     * Check if the caller has asked for the given event type to be\n     * registered.\n     *\n     * @method shouldAddEvent\n     * @private\n     * @param {string} eventType name of the event (see events above)\n     * @param {array} include the list of events to be added\n     * @return {bool} true if the event should be added, false otherwise.\n     *\/\n    var shouldAddEvent = function(eventType, include) {\n        include = include || [];\n\n        if (include.length && include.indexOf(eventType) !== -1) {\n            return true;\n        }\n\n        return false;\n    };\n\n    \/**\n     * Check if any of the modifier keys have been pressed on the event.\n     *\n     * @method isModifierPressed\n     * @private\n     * @param {event} e jQuery event\n     * @return {bool} true if shift, meta (command on Mac), alt or ctrl are pressed\n     *\/\n    var isModifierPressed = function(e) {\n        return (e.shiftKey || e.metaKey || e.altKey || e.ctrlKey);\n    };\n\n    \/**\n     * Trigger the custom event for the given jQuery event.\n     *\n     * This function will only fire the custom event if one hasn't already been\n     * fired for the jQuery event.\n     *\n     * This is to prevent multiple custom event handlers triggering multiple\n     * custom events for a single jQuery event as it bubbles up the stack.\n     *\n     * @param  {string} eventName The name of the custom event\n     * @param  {event} e          The jQuery event\n     * @return {void}\n     *\/\n    var triggerEvent = function(eventName, e) {\n        var eventTypeKey = \"\";\n\n        if (!e.hasOwnProperty('originalEvent')) {\n            \/\/ This is a jQuery event generated from JavaScript not a browser event so\n            \/\/ we need to build the cache key for the event.\n            eventTypeKey = \"\" + eventName + e.type + e.timeStamp;\n\n            if (!triggeredEvents.hasOwnProperty(eventTypeKey)) {\n                \/\/ If we haven't seen this jQuery event before then fire a custom\n                \/\/ event for it and remember the event for later.\n                triggeredEvents[eventTypeKey] = true;\n                $(e.target).trigger(eventName, [{originalEvent: e}]);\n            }\n            return;\n        }\n\n        eventTypeKey = \"triggeredCustom_\" + eventName;\n        if (!e.originalEvent.hasOwnProperty(eventTypeKey)) {\n            \/\/ If this is a jQuery event generated by the browser then set a\n            \/\/ property on the original event to track that we've seen it before.\n            \/\/ The property is set on the original event because it's the only part\n            \/\/ of the jQuery event that is maintained through multiple event handlers.\n            e.originalEvent[eventTypeKey] = true;\n            $(e.target).trigger(eventName, [{originalEvent: e}]);\n            return;\n        }\n    };\n\n    \/**\n     * Register a keyboard event that ignores modifier keys.\n     *\n     * @method addKeyboardEvent\n     * @private\n     * @param {object} element A jQuery object of the element to bind events to\n     * @param {string} event The custom interaction event name\n     * @param {int} keyCode The key code.\n     *\/\n    var addKeyboardEvent = function(element, event, keyCode) {\n        element.off('keydown.' + event).on('keydown.' + event, function(e) {\n            if (!isModifierPressed(e)) {\n                if (e.keyCode == keyCode) {\n                    triggerEvent(event, e);\n                }\n            }\n        });\n    };\n\n    \/**\n     * Trigger the activate event on the given element if it is clicked or the enter\n     * or space key are pressed without a modifier key.\n     *\n     * @method addActivateListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addActivateListener = function(element) {\n        element.off('click.cie.activate').on('click.cie.activate', function(e) {\n            triggerEvent(events.activate, e);\n        });\n        element.off('keydown.cie.activate').on('keydown.cie.activate', function(e) {\n            if (!isModifierPressed(e)) {\n                if (e.keyCode == keyCodes.enter || e.keyCode == keyCodes.space) {\n                    triggerEvent(events.activate, e);\n                }\n            }\n        });\n    };\n\n    \/**\n     * Trigger the keyboard activate event on the given element if the enter\n     * or space key are pressed without a modifier key.\n     *\n     * @method addKeyboardActivateListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addKeyboardActivateListener = function(element) {\n        element.off('keydown.cie.keyboardactivate').on('keydown.cie.keyboardactivate', function(e) {\n            if (!isModifierPressed(e)) {\n                if (e.keyCode == keyCodes.enter || e.keyCode == keyCodes.space) {\n                    triggerEvent(events.keyboardActivate, e);\n                }\n            }\n        });\n    };\n\n    \/**\n     * Trigger the escape event on the given element if the escape key is pressed\n     * without a modifier key.\n     *\n     * @method addEscapeListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addEscapeListener = function(element) {\n        addKeyboardEvent(element, events.escape, keyCodes.escape);\n    };\n\n    \/**\n     * Trigger the down event on the given element if the down arrow key is pressed\n     * without a modifier key.\n     *\n     * @method addDownListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addDownListener = function(element) {\n        addKeyboardEvent(element, events.down, keyCodes.arrowDown);\n    };\n\n    \/**\n     * Trigger the up event on the given element if the up arrow key is pressed\n     * without a modifier key.\n     *\n     * @method addUpListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addUpListener = function(element) {\n        addKeyboardEvent(element, events.up, keyCodes.arrowUp);\n    };\n\n    \/**\n     * Trigger the home event on the given element if the home key is pressed\n     * without a modifier key.\n     *\n     * @method addHomeListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addHomeListener = function(element) {\n        addKeyboardEvent(element, events.home, keyCodes.home);\n    };\n\n    \/**\n     * Trigger the end event on the given element if the end key is pressed\n     * without a modifier key.\n     *\n     * @method addEndListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addEndListener = function(element) {\n        addKeyboardEvent(element, events.end, keyCodes.end);\n    };\n\n    \/**\n     * Trigger the next event on the given element if the right arrow key is pressed\n     * without a modifier key in LTR mode or left arrow key in RTL mode.\n     *\n     * @method addNextListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addNextListener = function(element) {\n        \/\/ Left and right are flipped in RTL mode.\n        var keyCode = $('html').attr('dir') == \"rtl\" ? keyCodes.arrowLeft : keyCodes.arrowRight;\n\n        addKeyboardEvent(element, events.next, keyCode);\n    };\n\n    \/**\n     * Trigger the previous event on the given element if the left arrow key is pressed\n     * without a modifier key in LTR mode or right arrow key in RTL mode.\n     *\n     * @method addPreviousListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addPreviousListener = function(element) {\n        \/\/ Left and right are flipped in RTL mode.\n        var keyCode = $('html').attr('dir') == \"rtl\" ? keyCodes.arrowRight : keyCodes.arrowLeft;\n\n        addKeyboardEvent(element, events.previous, keyCode);\n    };\n\n    \/**\n     * Trigger the asterix event on the given element if the asterix key is pressed\n     * without a modifier key.\n     *\n     * @method addAsterixListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addAsterixListener = function(element) {\n        addKeyboardEvent(element, events.asterix, keyCodes.asterix);\n    };\n\n\n    \/**\n     * Trigger the scrollTop event on the given element if the user scrolls to\n     * the top of the given element.\n     *\n     * @method addScrollTopListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addScrollTopListener = function(element) {\n        element.off('scroll.cie.scrollTop').on('scroll.cie.scrollTop', function(e) {\n            var scrollTop = element.scrollTop();\n            if (scrollTop === 0) {\n                triggerEvent(events.scrollTop, e);\n            }\n        });\n    };\n\n    \/**\n     * Trigger the scrollBottom event on the given element if the user scrolls to\n     * the bottom of the given element.\n     *\n     * @method addScrollBottomListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addScrollBottomListener = function(element) {\n        element.off('scroll.cie.scrollBottom').on('scroll.cie.scrollBottom', function(e) {\n            var scrollTop = element.scrollTop();\n            var innerHeight = element.innerHeight();\n            var scrollHeight = element[0].scrollHeight;\n\n            if (scrollTop + innerHeight >= scrollHeight) {\n                triggerEvent(events.scrollBottom, e);\n            }\n        });\n    };\n\n    \/**\n     * Trigger the scrollLock event on the given element if the user scrolls to\n     * the bottom or top of the given element.\n     *\n     * @method addScrollLockListener\n     * @private\n     * @param {jQuery} element jQuery object to add event listeners to\n     *\/\n    var addScrollLockListener = function(element) {\n        \/\/ Lock mousewheel scrolling within the element to stop the annoying window scroll.\n        element.off('DOMMouseScroll.cie.DOMMouseScrollLock mousewheel.cie.mousewheelLock')\n            .on('DOMMouseScroll.cie.DOMMouseScrollLock mousewheel.cie.mousewheelLock', function(e) {\n                var scrollTop = element.scrollTop();\n                var scrollHeight = element[0].scrollHeight;\n                var height = element.height();\n                var delta = (e.type == 'DOMMouseScroll' ?\n                    e.originalEvent.detail * -40 :\n                    e.originalEvent.wheelDelta);\n                var up = delta > 0;\n\n                if (!up && -delta > scrollHeight - height - scrollTop) {\n                    \/\/ Scrolling down past the bottom.\n                    element.scrollTop(scrollHeight);\n                    e.stopPropagation();\n                    e.preventDefault();\n                    e.returnValue = false;\n                    \/\/ Fire the scroll lock event.\n                    triggerEvent(events.scrollLock, e);\n\n                    return false;\n                } else if (up && delta > scrollTop) {\n                    \/\/ Scrolling up past the top.\n                    element.scrollTop(0);\n                    e.stopPropagation();\n                    e.preventDefault();\n                    e.returnValue = false;\n                    \/\/ Fire the scroll lock event.\n                    triggerEvent(events.scrollLock, e);\n\n                    return false;\n                }\n\n                return true;\n            });\n    };\n\n    \/**\n     * Trigger the ctrlPageUp event on the given element if the user presses the\n     * control and page up key.\n     *\n     * @method addCtrlPageUpListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addCtrlPageUpListener = function(element) {\n        element.off('keydown.cie.ctrlpageup').on('keydown.cie.ctrlpageup', function(e) {\n            if (e.ctrlKey) {\n                if (e.keyCode == keyCodes.pageUp) {\n                    triggerEvent(events.ctrlPageUp, e);\n                }\n            }\n        });\n    };\n\n    \/**\n     * Trigger the ctrlPageDown event on the given element if the user presses the\n     * control and page down key.\n     *\n     * @method addCtrlPageDownListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addCtrlPageDownListener = function(element) {\n        element.off('keydown.cie.ctrlpagedown').on('keydown.cie.ctrlpagedown', function(e) {\n            if (e.ctrlKey) {\n                if (e.keyCode == keyCodes.pageDown) {\n                    triggerEvent(events.ctrlPageDown, e);\n                }\n            }\n        });\n    };\n\n    \/**\n     * Trigger the enter event on the given element if the enter key is pressed\n     * without a modifier key.\n     *\n     * @method addEnterListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addEnterListener = function(element) {\n        addKeyboardEvent(element, events.enter, keyCodes.enter);\n    };\n\n    \/**\n     * Trigger the AccessibleChange event on the given element if the value of the element is changed.\n     *\n     * @method addAccessibleChangeListener\n     * @private\n     * @param {object} element jQuery object to add event listeners to\n     *\/\n    var addAccessibleChangeListener = function(element) {\n        var onMac = navigator.userAgent.indexOf('Macintosh') !== -1;\n        var touchEnabled = ('ontouchstart' in window) || (('msMaxTouchPoints' in navigator) && (navigator.msMaxTouchPoints > 0));\n        if (onMac || touchEnabled) {\n            \/\/ On Mac devices, and touch-enabled devices, the change event seems to be handled correctly and\n            \/\/ consistently at this time.\n            element.on('change', function(e) {\n                triggerEvent(events.accessibleChange, e);\n            });\n        } else {\n            \/\/ Some browsers have non-normalised behaviour for handling the selection of values in a <select> element.\n            \/\/ When using Chrome on Linux (and possibly others), a 'change' event is fired when pressing the Escape key.\n            \/\/ When using Firefox on Linux (and possibly others), a 'change' event is fired when navigating through the\n            \/\/ list with a keyboard.\n            \/\/\n            \/\/ To normalise these behaviours:\n            \/\/ - the initial value is stored in a data attribute when focusing the element\n            \/\/ - the current value is checked against the stored initial value when and the accessibleChange event fired when:\n            \/\/ --- blurring the element\n            \/\/ --- the 'Enter' key is pressed\n            \/\/ --- the element is clicked\n            \/\/ --- the 'change' event is fired, except where it is from a keyboard interaction\n            \/\/\n            \/\/ To facilitate the change event keyboard interaction check, the 'keyDown' handler sets a flag to ignore\n            \/\/ the change event handler which is unset on the 'keyUp' event.\n            \/\/\n            \/\/ Unfortunately we cannot control this entirely as some browsers (Chrome) trigger a change event when\n            \/\/ pressign the Escape key, and this is considered to be the correct behaviour.\n            \/\/ Chrome https:\/\/bugs.chromium.org\/p\/chromium\/issues\/detail?id=839717\n            \/\/\n            \/\/ Our longer-term solution to this should be to switch away from using <select> boxes as a single-select,\n            \/\/ and make use of a dropdown of action links like the Bootstrap Dropdown menu.\n            var setInitialValue = function(target) {\n                target.dataset.initValue = target.value;\n            };\n            var resetToInitialValue = function(target) {\n                if ('initValue' in target.dataset) {\n                    target.value = target.dataset.initValue;\n                }\n            };\n            var checkAndTriggerAccessibleChange = function(e) {\n                if (!('initValue' in e.target.dataset)) {\n                    \/\/ Some browsers trigger click before focus, therefore it is possible that initValue is undefined.\n                    \/\/ In this case it's likely that it's being focused for the first time and we should therefore not submit.\n                    return;\n                }\n\n                if (e.target.value !== e.target.dataset.initValue) {\n                    \/\/ Update the initValue when the event is triggered.\n                    \/\/ This means that if the click handler fires before the focus handler on a subsequent interaction\n                    \/\/ with the element, the currently dispalyed value will be the best guess current value.\n                    e.target.dataset.initValue = e.target.value;\n                    triggerEvent(events.accessibleChange, e);\n                }\n            };\n            var nativeElement = element.get()[0];\n            \/\/ The `focus` and `blur` events do not support bubbling. Use Event Capture instead.\n            nativeElement.addEventListener('focus', function(e) {\n                setInitialValue(e.target);\n            }, true);\n            nativeElement.addEventListener('blur', function(e) {\n                checkAndTriggerAccessibleChange(e);\n            }, true);\n            element.on('keydown', function(e) {\n                if ((e.which === keyCodes.enter)) {\n                    checkAndTriggerAccessibleChange(e);\n                } else if (e.which === keyCodes.escape) {\n                    resetToInitialValue(e.target);\n                    e.target.dataset.ignoreChange = true;\n                } else {\n                    \/\/ Firefox triggers a change event when using the keyboard to scroll through the selection.\n                    \/\/ Set a data- attribute that the change listener can use to ignore the change event where it was\n                    \/\/ generated from a keyboard change such as typing to complete a value, or using arrow keys.\n                    e.target.dataset.ignoreChange = true;\n\n                }\n            });\n            element.on('change', function(e) {\n                if (e.target.dataset.ignoreChange) {\n                    \/\/ This change event was triggered from a keyboard change which is not yet complete.\n                    \/\/ Do not trigger the accessibleChange event until the selection is completed using the [return]\n                    \/\/ key.\n                    return;\n                }\n\n                checkAndTriggerAccessibleChange(e);\n            });\n            element.on('keyup', function(e) {\n                \/\/ The key has been lifted. Stop ignoring the change event.\n                delete e.target.dataset.ignoreChange;\n            });\n            element.on('click', function(e) {\n                checkAndTriggerAccessibleChange(e);\n            });\n        }\n    };\n\n    \/**\n     * Get the list of events and their handlers.\n     *\n     * @method getHandlers\n     * @private\n     * @return {object} object key of event names and value of handler functions\n     *\/\n    var getHandlers = function() {\n        var handlers = {};\n\n        handlers[events.activate] = addActivateListener;\n        handlers[events.keyboardActivate] = addKeyboardActivateListener;\n        handlers[events.escape] = addEscapeListener;\n        handlers[events.down] = addDownListener;\n        handlers[events.up] = addUpListener;\n        handlers[events.home] = addHomeListener;\n        handlers[events.end] = addEndListener;\n        handlers[events.next] = addNextListener;\n        handlers[events.previous] = addPreviousListener;\n        handlers[events.asterix] = addAsterixListener;\n        handlers[events.scrollLock] = addScrollLockListener;\n        handlers[events.scrollTop] = addScrollTopListener;\n        handlers[events.scrollBottom] = addScrollBottomListener;\n        handlers[events.ctrlPageUp] = addCtrlPageUpListener;\n        handlers[events.ctrlPageDown] = addCtrlPageDownListener;\n        handlers[events.enter] = addEnterListener;\n        handlers[events.accessibleChange] = addAccessibleChangeListener;\n\n        return handlers;\n    };\n\n    \/**\n     * Add all of the listeners on the given element for the requested events.\n     *\n     * @method define\n     * @public\n     * @param {object} element the DOM element to register event listeners on\n     * @param {array} include the array of events to be triggered\n     *\/\n    var define = function(element, include) {\n        element = $(element);\n        include = include || [];\n\n        if (!element.length || !include.length) {\n            return;\n        }\n\n        $.each(getHandlers(), function(eventType, handler) {\n            if (shouldAddEvent(eventType, include)) {\n                handler(element);\n            }\n        });\n    };\n\n    return {\n        define: define,\n        events: events,\n    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