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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 * A javascript module to handle calendar drag and drop in the calendar\n * month view.\n *\n * @module core_calendar/month_view_drag_drop\n * @class month_view_drag_drop\n * @package core_calendar\n * @copyright 2017 Ryan Wyllie <ryan@moodle.com>\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\ndefine([\n 'jquery',\n 'core/notification',\n 'core/str',\n 'core_calendar/events',\n 'core_calendar/drag_drop_data_store'\n ],\n function(\n $,\n Notification,\n Str,\n CalendarEvents,\n DataStore\n ) {\n\n var SELECTORS = {\n ROOT: \"[data-region='calendar']\",\n DRAGGABLE: '[draggable=\"true\"][data-region=\"event-item\"]',\n DROP_ZONE: '[data-drop-zone=\"month-view-day\"]',\n WEEK: '[data-region=\"month-view-week\"]',\n };\n var INVALID_DROP_ZONE_CLASS = 'bg-faded';\n var INVALID_HOVER_CLASS = 'bg-danger text-white';\n var VALID_HOVER_CLASS = 'bg-primary text-white';\n var ALL_CLASSES = INVALID_DROP_ZONE_CLASS + ' ' + INVALID_HOVER_CLASS + ' ' + VALID_HOVER_CLASS;\n /* @var {bool} registered If the event listeners have been added */\n var registered = false;\n\n /**\n * Get the correct drop zone element from the given javascript\n * event.\n *\n * @param {event} e The javascript event\n * @return {object|null}\n */\n var getDropZoneFromEvent = function(e) {\n var dropZone = $(e.target).closest(SELECTORS.DROP_ZONE);\n return (dropZone.length) ? dropZone : null;\n };\n\n /**\n * Determine if the given dropzone element is within the acceptable\n * time range.\n *\n * The drop zone timestamp is midnight on that day so we should check\n * that the event's acceptable timestart value\n *\n * @param {object} dropZone The drop zone day from the calendar\n * @return {bool}\n */\n var isValidDropZone = function(dropZone) {\n var dropTimestamp = dropZone.attr('data-day-timestamp');\n var minTimestart = DataStore.getMinTimestart();\n var maxTimestart = DataStore.getMaxTimestart();\n\n if (minTimestart && minTimestart > dropTimestamp) {\n return false;\n }\n\n if (maxTimestart && maxTimestart < dropTimestamp) {\n return false;\n }\n\n return true;\n };\n\n /**\n * Get the error string to display for a given drop zone element\n * if it is invalid.\n *\n * @param {object} dropZone The drop zone day from the calendar\n * @return {string}\n */\n var getDropZoneError = function(dropZone) {\n var dropTimestamp = dropZone.attr('data-day-timestamp');\n var minTimestart = DataStore.getMinTimestart();\n var maxTimestart = DataStore.getMaxTimestart();\n\n if (minTimestart && minTimestart > dropTimestamp) {\n return DataStore.getMinError();\n }\n\n if (maxTimestart && maxTimestart < dropTimestamp) {\n return DataStore.getMaxError();\n }\n\n return null;\n };\n\n /**\n * Remove all of the styling from each of the drop zones in the calendar.\n */\n var clearAllDropZonesState = function() {\n $(SELECTORS.ROOT).find(SELECTORS.DROP_ZONE).each(function(index, dropZone) {\n dropZone = $(dropZone);\n dropZone.removeClass(ALL_CLASSES);\n });\n };\n\n /**\n * Update the hover state for the event in the calendar to reflect\n * which days the event will be moved to.\n *\n * If the drop zone is not being hovered then it will apply some\n * styling to reflect whether the drop zone is a valid or invalid\n * drop place for the current dragging event.\n *\n * This funciton supports events spanning multiple days and will\n * recurse to highlight (or remove highlight) each of the days\n * that the event will be moved to.\n *\n * For example: An event with a duration of 3 days will have\n * 3 days highlighted when it's dragged elsewhere in the calendar.\n * The current drag target and the 2 days following it (including\n * wrapping to the next week if necessary).\n *\n * @param {string|object} target The drag target element\n * @param {bool} hovered If the target is hovered or not\n * @param {int} count How many days to highlight (default to duration)\n */\n var updateHoverState = function(dropZone, hovered, count) {\n if (typeof count === 'undefined') {\n // This is how many days we need to highlight.\n count = DataStore.getDurationDays();\n }\n\n var valid = isValidDropZone(dropZone);\n dropZone.removeClass(ALL_CLASSES);\n\n if (hovered) {\n\n if (valid) {\n dropZone.addClass(VALID_HOVER_CLASS);\n } else {\n dropZone.addClass(INVALID_HOVER_CLASS);\n }\n } else {\n dropZone.removeClass(VALID_HOVER_CLASS + ' ' + INVALID_HOVER_CLASS);\n\n if (!valid) {\n dropZone.addClass(INVALID_DROP_ZONE_CLASS);\n }\n }\n\n count--;\n\n // If we've still got days to highlight then we should\n // find the next day.\n if (count > 0) {\n var nextDropZone = dropZone.next();\n\n // If there are no more days in this week then we\n // need to move down to the next week in the calendar.\n if (!nextDropZone.length) {\n var nextWeek = dropZone.closest(SELECTORS.WEEK).next();\n\n if (nextWeek.length) {\n nextDropZone = nextWeek.children(SELECTORS.DROP_ZONE).first();\n }\n }\n\n // If we found another day then let's recursively\n // update it's hover state.\n if (nextDropZone.length) {\n updateHoverState(nextDropZone, hovered, count);\n }\n }\n };\n\n /**\n * Find all of the calendar event drop zones in the calendar and update the display\n * for the user to indicate which zones are valid and invalid.\n */\n var updateAllDropZonesState = function() {\n $(SELECTORS.ROOT).find(SELECTORS.DROP_ZONE).each(function(index, dropZone) {\n dropZone = $(dropZone);\n\n if (!isValidDropZone(dropZone)) {\n updateHoverState(dropZone, false);\n }\n });\n };\n\n\n /**\n * Set up the module level variables to track which event is being\n * dragged and how many days it spans.\n *\n * @param {event} e The dragstart event\n */\n var dragstartHandler = function(e) {\n var target = $(e.target);\n var draggableElement = target.closest(SELECTORS.DRAGGABLE);\n\n if (!draggableElement.length) {\n return;\n }\n\n var eventElement = draggableElement.find('[data-event-id]');\n var eventId = eventElement.attr('data-event-id');\n var minTimestart = draggableElement.attr('data-min-day-timestamp');\n var maxTimestart = draggableElement.attr('data-max-day-timestamp');\n var minError = draggableElement.attr('data-min-day-error');\n var maxError = draggableElement.attr('data-max-day-error');\n var eventsSelector = SELECTORS.ROOT + ' [data-event-id=\"' + eventId + '\"]';\n var duration = $(eventsSelector).length;\n\n DataStore.setEventId(eventId);\n DataStore.setDurationDays(duration);\n\n if (minTimestart) {\n DataStore.setMinTimestart(minTimestart);\n }\n\n if (maxTimestart) {\n DataStore.setMaxTimestart(maxTimestart);\n }\n\n if (minError) {\n DataStore.setMinError(minError);\n }\n\n if (maxError) {\n DataStore.setMaxError(maxError);\n }\n\n e.dataTransfer.effectAllowed = \"move\";\n e.dataTransfer.dropEffect = \"move\";\n // Firefox requires a value to be set here or the drag won't\n // work and the dragover handler won't fire.\n e.dataTransfer.setData('text/plain', eventId);\n e.dropEffect = \"move\";\n\n updateAllDropZonesState();\n };\n\n /**\n * Update the hover state of the target day element when\n * the user is dragging an event over it.\n *\n * This will add a visual indicator to the calendar UI to\n * indicate which day(s) the event will be moved to.\n *\n * @param {event} e The dragstart event\n */\n var dragoverHandler = function(e) {\n // Ignore dragging of non calendar events.\n if (!DataStore.hasEventId()) {\n return;\n }\n\n e.preventDefault();\n\n var dropZone = getDropZoneFromEvent(e);\n\n if (!dropZone) {\n return;\n }\n\n updateHoverState(dropZone, true);\n };\n\n /**\n * Update the hover state of the target day element that was\n * previously dragged over but has is no longer a drag target.\n *\n * This will remove the visual indicator from the calendar UI\n * that was added by the dragoverHandler.\n *\n * @param {event} e The dragstart event\n */\n var dragleaveHandler = function(e) {\n // Ignore dragging of non calendar events.\n if (!DataStore.hasEventId()) {\n return;\n }\n\n var dropZone = getDropZoneFromEvent(e);\n\n if (!dropZone) {\n return;\n }\n\n updateHoverState(dropZone, false);\n e.preventDefault();\n };\n\n /**\n * Determines the event element, origin day, and destination day\n * once the user drops the calendar event. These three bits of data\n * are provided as the payload to the \"moveEvent\" calendar javascript\n * event that is fired.\n *\n * This will remove the visual indicator from the calendar UI\n * that was added by the dragoverHandler.\n *\n * @param {event} e The dragstart event\n */\n var dropHandler = function(e) {\n // Ignore dragging of non calendar events.\n if (!DataStore.hasEventId()) {\n return;\n }\n\n var dropZone = getDropZoneFromEvent(e);\n\n if (!dropZone) {\n DataStore.clearAll();\n clearAllDropZonesState();\n return;\n }\n\n if (isValidDropZone(dropZone)) {\n var eventId = DataStore.getEventId();\n var eventElementSelector = SELECTORS.ROOT + ' [data-event-id=\"' + eventId + '\"]';\n var eventElement = $(eventElementSelector);\n var origin = null;\n\n if (eventElement.length) {\n origin = eventElement.closest(SELECTORS.DROP_ZONE);\n }\n\n $('body').trigger(CalendarEvents.moveEvent, [eventId, origin, dropZone]);\n } else {\n // If the drop zone is not valid then there is not need for us to\n // try to process it. Instead we can just show an error to the user.\n var message = getDropZoneError(dropZone);\n Str.get_string('errorinvaliddate', 'calendar').then(function(string) {\n Notification.exception({\n name: string,\n message: message || string\n });\n });\n }\n\n DataStore.clearAll();\n clearAllDropZonesState();\n\n e.preventDefault();\n };\n\n /**\n * Clear the data store and remove the drag indicators from the UI\n * when the drag event has finished.\n */\n var dragendHandler = function() {\n DataStore.clearAll();\n clearAllDropZonesState();\n };\n\n /**\n * Re-render the drop zones in the new month to highlight\n * which areas are or aren't acceptable to drop the calendar\n * event.\n */\n var calendarMonthChangedHandler = function() {\n updateAllDropZonesState();\n };\n\n return {\n /**\n * Initialise the event handlers for the drag events.\n */\n init: function() {\n if (!registered) {\n // These handlers are only added the first time the module\n // is loaded because we don't want to have a new listener\n // added each time the \"init\" function is called otherwise we'll\n // end up with lots of stale handlers.\n document.addEventListener('dragstart', dragstartHandler, false);\n document.addEventListener('dragover', dragoverHandler, false);\n document.addEventListener('dragleave', dragleaveHandler, false);\n document.addEventListener('drop', dropHandler, false);\n document.addEventListener('dragend', dragendHandler, false);\n $('body').on(CalendarEvents.monthChanged, calendarMonthChangedHandler);\n registered = true;\n }\n },\n };\n});\n"],"file":"month_view_drag_drop.min.js"}