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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 * JavaScript to allow dragging options to slots (using mouse down or touch) or tab through slots using keyboard.\n *\n * @module qtype_ddimageortext/question\n * @copyright 2018 The Open University\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\ndefine(['jquery', 'core/dragdrop', 'core/key_codes'], function($, dragDrop, keys) {\n\n \"use strict\";\n\n /**\n * Initialise one drag-drop onto image question.\n *\n * @param {String} containerId id of the outer div for this question.\n * @param {boolean} readOnly whether the question is being displayed read-only.\n * @param {Array} places Information about the drop places.\n * @constructor\n */\n function DragDropOntoImageQuestion(containerId, readOnly, places) {\n this.containerId = containerId;\n M.util.js_pending('qtype_ddimageortext-init-' + this.containerId);\n this.places = places;\n this.allImagesLoaded = false;\n this.imageLoadingTimeoutId = null;\n this.isPrinting = false;\n if (readOnly) {\n this.getRoot().addClass('qtype_ddimageortext-readonly');\n }\n\n var thisQ = this;\n this.getNotYetLoadedImages().one('load', function() {\n thisQ.waitForAllImagesToBeLoaded();\n });\n this.waitForAllImagesToBeLoaded();\n }\n\n /**\n * Waits until all images are loaded before calling setupQuestion().\n *\n * This function is called from the onLoad of each image, and also polls with\n * a time-out, because image on-loads are allegedly unreliable.\n */\n DragDropOntoImageQuestion.prototype.waitForAllImagesToBeLoaded = function() {\n var thisQ = this;\n\n // This method may get called multiple times (via image on-loads or timeouts.\n // If we are already done, don't do it again.\n if (this.allImagesLoaded) {\n return;\n }\n\n // Clear any current timeout, if set.\n if (this.imageLoadingTimeoutId !== null) {\n clearTimeout(this.imageLoadingTimeoutId);\n }\n\n // If we have not yet loaded all images, set a timeout to\n // call ourselves again, since apparently images on-load\n // events are flakey.\n if (this.getNotYetLoadedImages().length > 0) {\n this.imageLoadingTimeoutId = setTimeout(function() {\n thisQ.waitForAllImagesToBeLoaded();\n }, 100);\n return;\n }\n\n // We now have all images. Carry on, but only after giving the layout a chance to settle down.\n this.allImagesLoaded = true;\n thisQ.setupQuestion();\n };\n\n /**\n * Get any of the images in the drag-drop area that are not yet fully loaded.\n *\n * @returns {jQuery} those images.\n */\n DragDropOntoImageQuestion.prototype.getNotYetLoadedImages = function() {\n var thisQ = this;\n return this.getRoot().find('.ddarea img').not(function(i, imgNode) {\n return thisQ.imageIsLoaded(imgNode);\n });\n };\n\n /**\n * Check if an image has loaded without errors.\n *\n * @param {HTMLImageElement} imgElement an image.\n * @returns {boolean} true if this image has loaded without errors.\n */\n DragDropOntoImageQuestion.prototype.imageIsLoaded = function(imgElement) {\n return imgElement.complete && imgElement.naturalHeight !== 0;\n };\n\n /**\n * Set up the question, once all images have been loaded.\n */\n DragDropOntoImageQuestion.prototype.setupQuestion = function() {\n this.resizeAllDragsAndDrops();\n this.cloneDrags();\n this.positionDragsAndDrops();\n M.util.js_complete('qtype_ddimageortext-init-' + this.containerId);\n };\n\n /**\n * In each group, resize all the items to be the same size.\n */\n DragDropOntoImageQuestion.prototype.resizeAllDragsAndDrops = function() {\n var thisQ = this;\n this.getRoot().find('.draghomes > div').each(function(i, node) {\n thisQ.resizeAllDragsAndDropsInGroup(\n thisQ.getClassnameNumericSuffix($(node), 'dragitemgroup'));\n });\n };\n\n /**\n * In a given group, set all the drags and drops to be the same size.\n *\n * @param {int} group the group number.\n */\n DragDropOntoImageQuestion.prototype.resizeAllDragsAndDropsInGroup = function(group) {\n var root = this.getRoot(),\n dragHomes = root.find('.dragitemgroup' + group + ' .draghome'),\n maxWidth = 0,\n maxHeight = 0;\n\n // Find the maximum size of any drag in this groups.\n dragHomes.each(function(i, drag) {\n maxWidth = Math.max(maxWidth, Math.ceil(drag.offsetWidth));\n maxHeight = Math.max(maxHeight, Math.ceil(drag.offsetHeight));\n });\n\n // The size we will want to set is a bit bigger than this.\n maxWidth += 10;\n maxHeight += 10;\n\n // Set each drag home to that size.\n dragHomes.each(function(i, drag) {\n var left = Math.round((maxWidth - drag.offsetWidth) / 2),\n top = Math.floor((maxHeight - drag.offsetHeight) / 2);\n // Set top and left padding so the item is centred.\n $(drag).css({\n 'padding-left': left + 'px',\n 'padding-right': (maxWidth - drag.offsetWidth - left) + 'px',\n 'padding-top': top + 'px',\n 'padding-bottom': (maxHeight - drag.offsetHeight - top) + 'px'\n });\n });\n\n // Create the drops and make them the right size.\n for (var i in this.places) {\n if (!this.places.hasOwnProperty((i))) {\n continue;\n }\n var place = this.places[i],\n label = place.text;\n if (parseInt(place.group) !== group) {\n continue;\n }\n if (label === '') {\n label = M.util.get_string('blank', 'qtype_ddimageortext');\n }\n root.find('.dropzones').append('<div class=\"dropzone active group' + place.group +\n ' place' + i + '\" tabindex=\"0\">' +\n '<span class=\"accesshide\">' + label + '</span> </div>');\n root.find('.dropzone.place' + i).width(maxWidth - 2).height(maxHeight - 2);\n }\n };\n\n /**\n * Invisible 'drag homes' are output by the renderer. These have the same properties\n * as the drag items but are invisible. We clone these invisible elements to make the\n * actual drag items.\n */\n DragDropOntoImageQuestion.prototype.cloneDrags = function() {\n var thisQ = this;\n thisQ.getRoot().find('.draghome').each(function(index, dragHome) {\n var drag = $(dragHome);\n var placeHolder = drag.clone();\n placeHolder.removeClass();\n placeHolder.addClass('draghome choice' +\n thisQ.getChoice(drag) + ' group' +\n thisQ.getGroup(drag) + ' dragplaceholder');\n drag.before(placeHolder);\n });\n };\n\n /**\n * Clone drag item for one choice.\n *\n * @param {jQuery} dragHome the drag home to clone.\n */\n DragDropOntoImageQuestion.prototype.cloneDragsForOneChoice = function(dragHome) {\n if (dragHome.hasClass('infinite')) {\n var noOfDrags = this.noOfDropsInGroup(this.getGroup(dragHome));\n for (var i = 0; i < noOfDrags; i++) {\n this.cloneDrag(dragHome);\n }\n } else {\n this.cloneDrag(dragHome);\n }\n };\n\n /**\n * Clone drag item.\n *\n * @param {jQuery} dragHome\n */\n DragDropOntoImageQuestion.prototype.cloneDrag = function(dragHome) {\n var drag = dragHome.clone();\n drag.removeClass('draghome')\n .addClass('drag unplaced moodle-has-zindex')\n .offset(dragHome.offset());\n this.getRoot().find('.dragitems').append(drag);\n };\n\n /**\n * Update the position of drags.\n */\n DragDropOntoImageQuestion.prototype.positionDragsAndDrops = function() {\n var thisQ = this,\n root = this.getRoot(),\n bgRatio = this.bgRatio();\n\n // Move the drops into position.\n root.find('.ddarea .dropzone').each(function(i, dropNode) {\n var drop = $(dropNode),\n place = thisQ.places[thisQ.getPlace(drop)];\n // The xy values come from PHP as strings, so we need parseInt to stop JS doing string concatenation.\n drop.css('left', parseInt(place.xy[0]) * bgRatio)\n .css('top', parseInt(place.xy[1]) * bgRatio);\n drop.data('originX', parseInt(place.xy[0]))\n .data('originY', parseInt(place.xy[1]));\n thisQ.handleElementScale(drop, 'left top');\n });\n\n // First move all items back home.\n root.find('.draghome').not('.dragplaceholder').each(function(i, dragNode) {\n var drag = $(dragNode),\n currentPlace = thisQ.getClassnameNumericSuffix(drag, 'inplace');\n drag.addClass('unplaced')\n .removeClass('placed');\n drag.removeAttr('tabindex');\n if (currentPlace !== null) {\n drag.removeClass('inplace' + currentPlace);\n }\n });\n\n // Then place the ones that should be placed.\n root.find('input.placeinput').each(function(i, inputNode) {\n var input = $(inputNode),\n choice = input.val();\n if (choice.length === 0 || (choice.length > 0 && choice === '0')) {\n // No item in this place.\n return;\n }\n\n var place = thisQ.getPlace(input);\n // Get the unplaced drag.\n var unplacedDrag = thisQ.getUnplacedChoice(thisQ.getGroup(input), choice);\n // Get the clone of the drag.\n var hiddenDrag = thisQ.getDragClone(unplacedDrag);\n if (hiddenDrag.length) {\n if (unplacedDrag.hasClass('infinite')) {\n var noOfDrags = thisQ.noOfDropsInGroup(thisQ.getGroup(unplacedDrag));\n var cloneDrags = thisQ.getInfiniteDragClones(unplacedDrag, false);\n if (cloneDrags.length < noOfDrags) {\n var cloneDrag = unplacedDrag.clone();\n cloneDrag.removeClass('beingdragged');\n cloneDrag.removeAttr('tabindex');\n hiddenDrag.after(cloneDrag);\n } else {\n hiddenDrag.addClass('active');\n }\n } else {\n hiddenDrag.addClass('active');\n }\n }\n\n // Send the drag to drop.\n var drop = root.find('.dropzone.place' + place);\n thisQ.sendDragToDrop(unplacedDrag, drop);\n });\n };\n\n /**\n * Handles the start of dragging an item.\n *\n * @param {Event} e the touch start or mouse down event.\n */\n DragDropOntoImageQuestion.prototype.handleDragStart = function(e) {\n var thisQ = this,\n drag = $(e.target).closest('.draghome'),\n currentIndex = this.calculateZIndex(),\n newIndex = currentIndex + 2;\n\n var info = dragDrop.prepare(e);\n if (!info.start) {\n return;\n }\n\n drag.addClass('beingdragged').css('transform', '').css('z-index', newIndex);\n var currentPlace = this.getClassnameNumericSuffix(drag, 'inplace');\n if (currentPlace !== null) {\n this.setInputValue(currentPlace, 0);\n drag.removeClass('inplace' + currentPlace);\n var hiddenDrop = thisQ.getDrop(drag, currentPlace);\n if (hiddenDrop.length) {\n hiddenDrop.addClass('active');\n drag.offset(hiddenDrop.offset());\n }\n } else {\n var hiddenDrag = thisQ.getDragClone(drag);\n if (hiddenDrag.length) {\n if (drag.hasClass('infinite')) {\n var noOfDrags = this.noOfDropsInGroup(thisQ.getGroup(drag));\n var cloneDrags = this.getInfiniteDragClones(drag, false);\n if (cloneDrags.length < noOfDrags) {\n var cloneDrag = drag.clone();\n cloneDrag.removeClass('beingdragged');\n cloneDrag.removeAttr('tabindex');\n hiddenDrag.after(cloneDrag);\n questionManager.addEventHandlersToDrag(cloneDrag);\n drag.offset(cloneDrag.offset());\n } else {\n hiddenDrag.addClass('active');\n drag.offset(hiddenDrag.offset());\n }\n } else {\n hiddenDrag.addClass('active');\n drag.offset(hiddenDrag.offset());\n }\n }\n }\n\n dragDrop.start(e, drag, function(x, y, drag) {\n thisQ.dragMove(x, y, drag);\n }, function(x, y, drag) {\n thisQ.dragEnd(x, y, drag);\n });\n };\n\n /**\n * Called whenever the currently dragged items moves.\n *\n * @param {Number} pageX the x position.\n * @param {Number} pageY the y position.\n * @param {jQuery} drag the item being moved.\n */\n DragDropOntoImageQuestion.prototype.dragMove = function(pageX, pageY, drag) {\n var thisQ = this,\n highlighted = false;\n this.getRoot().find('.dropzone.group' + this.getGroup(drag)).each(function(i, dropNode) {\n var drop = $(dropNode);\n if (thisQ.isPointInDrop(pageX, pageY, drop) && !highlighted) {\n highlighted = true;\n drop.addClass('valid-drag-over-drop');\n } else {\n drop.removeClass('valid-drag-over-drop');\n }\n });\n this.getRoot().find('.draghome.placed.group' + this.getGroup(drag)).not('.beingdragged').each(function(i, dropNode) {\n var drop = $(dropNode);\n if (thisQ.isPointInDrop(pageX, pageY, drop) && !highlighted && !thisQ.isDragSameAsDrop(drag, drop)) {\n highlighted = true;\n drop.addClass('valid-drag-over-drop');\n } else {\n drop.removeClass('valid-drag-over-drop');\n }\n });\n };\n\n /**\n * Called when user drops a drag item.\n *\n * @param {Number} pageX the x position.\n * @param {Number} pageY the y position.\n * @param {jQuery} drag the item being moved.\n */\n DragDropOntoImageQuestion.prototype.dragEnd = function(pageX, pageY, drag) {\n var thisQ = this,\n root = this.getRoot(),\n placed = false;\n\n // Looking for drag that was dropped on a dropzone.\n root.find('.dropzone.group' + this.getGroup(drag)).each(function(i, dropNode) {\n var drop = $(dropNode);\n if (!thisQ.isPointInDrop(pageX, pageY, drop)) {\n // Not this drop.\n return true;\n }\n\n // Now put this drag into the drop.\n drop.removeClass('valid-drag-over-drop');\n thisQ.sendDragToDrop(drag, drop);\n placed = true;\n return false; // Stop the each() here.\n });\n\n if (!placed) {\n // Looking for drag that was dropped on a placed drag.\n root.find('.draghome.placed.group' + this.getGroup(drag)).not('.beingdragged').each(function(i, placedNode) {\n var placedDrag = $(placedNode);\n if (!thisQ.isPointInDrop(pageX, pageY, placedDrag) || thisQ.isDragSameAsDrop(drag, placedDrag)) {\n // Not this placed drag.\n return true;\n }\n\n // Now put this drag into the drop.\n placedDrag.removeClass('valid-drag-over-drop');\n var currentPlace = thisQ.getClassnameNumericSuffix(placedDrag, 'inplace');\n var drop = thisQ.getDrop(drag, currentPlace);\n thisQ.sendDragToDrop(drag, drop);\n placed = true;\n return false; // Stop the each() here.\n });\n }\n\n if (!placed) {\n this.sendDragHome(drag);\n }\n };\n\n /**\n * Animate a drag item into a given place (or back home).\n *\n * @param {jQuery|null} drag the item to place. If null, clear the place.\n * @param {jQuery} drop the place to put it.\n */\n DragDropOntoImageQuestion.prototype.sendDragToDrop = function(drag, drop) {\n // Is there already a drag in this drop? if so, evict it.\n var oldDrag = this.getCurrentDragInPlace(this.getPlace(drop));\n if (oldDrag.length !== 0) {\n oldDrag.addClass('beingdragged');\n oldDrag.offset(oldDrag.offset());\n var currentPlace = this.getClassnameNumericSuffix(oldDrag, 'inplace');\n var hiddenDrop = this.getDrop(oldDrag, currentPlace);\n hiddenDrop.addClass('active');\n this.sendDragHome(oldDrag);\n }\n\n if (drag.length === 0) {\n this.setInputValue(this.getPlace(drop), 0);\n if (drop.data('isfocus')) {\n drop.focus();\n }\n } else {\n this.setInputValue(this.getPlace(drop), this.getChoice(drag));\n drag.removeClass('unplaced')\n .addClass('placed inplace' + this.getPlace(drop));\n drag.attr('tabindex', 0);\n this.animateTo(drag, drop);\n }\n };\n\n /**\n * Animate a drag back to its home.\n *\n * @param {jQuery} drag the item being moved.\n */\n DragDropOntoImageQuestion.prototype.sendDragHome = function(drag) {\n var currentPlace = this.getClassnameNumericSuffix(drag, 'inplace');\n if (currentPlace !== null) {\n drag.removeClass('inplace' + currentPlace);\n }\n drag.data('unplaced', true);\n\n this.animateTo(drag, this.getDragHome(this.getGroup(drag), this.getChoice(drag)));\n };\n\n /**\n * Handles keyboard events on drops.\n *\n * Drops are focusable. Once focused, right/down/space switches to the next choice, and\n * left/up switches to the previous. Escape clear.\n *\n * @param {KeyboardEvent} e\n */\n DragDropOntoImageQuestion.prototype.handleKeyPress = function(e) {\n var drop = $(e.target).closest('.dropzone');\n if (drop.length === 0) {\n var placedDrag = $(e.target);\n var currentPlace = this.getClassnameNumericSuffix(placedDrag, 'inplace');\n if (currentPlace !== null) {\n drop = this.getDrop(placedDrag, currentPlace);\n }\n }\n var currentDrag = this.getCurrentDragInPlace(this.getPlace(drop)),\n nextDrag = $();\n\n switch (e.keyCode) {\n case keys.space:\n case keys.arrowRight:\n case keys.arrowDown:\n nextDrag = this.getNextDrag(this.getGroup(drop), currentDrag);\n break;\n\n case keys.arrowLeft:\n case keys.arrowUp:\n nextDrag = this.getPreviousDrag(this.getGroup(drop), currentDrag);\n break;\n\n case keys.escape:\n questionManager.isKeyboardNavigation = false;\n break;\n\n default:\n questionManager.isKeyboardNavigation = false;\n return; // To avoid the preventDefault below.\n }\n\n if (nextDrag.length) {\n nextDrag.data('isfocus', true);\n nextDrag.addClass('beingdragged');\n var hiddenDrag = this.getDragClone(nextDrag);\n if (hiddenDrag.length) {\n if (nextDrag.hasClass('infinite')) {\n var noOfDrags = this.noOfDropsInGroup(this.getGroup(nextDrag));\n var cloneDrags = this.getInfiniteDragClones(nextDrag, false);\n if (cloneDrags.length < noOfDrags) {\n var cloneDrag = nextDrag.clone();\n cloneDrag.removeClass('beingdragged');\n cloneDrag.removeAttr('tabindex');\n hiddenDrag.after(cloneDrag);\n questionManager.addEventHandlersToDrag(cloneDrag);\n nextDrag.offset(cloneDrag.offset());\n } else {\n hiddenDrag.addClass('active');\n nextDrag.offset(hiddenDrag.offset());\n }\n } else {\n hiddenDrag.addClass('active');\n nextDrag.offset(hiddenDrag.offset());\n }\n }\n } else {\n drop.data('isfocus', true);\n }\n\n e.preventDefault();\n this.sendDragToDrop(nextDrag, drop);\n };\n\n /**\n * Choose the next drag in a group.\n *\n * @param {int} group which group.\n * @param {jQuery} drag current choice (empty jQuery if there isn't one).\n * @return {jQuery} the next drag in that group, or null if there wasn't one.\n */\n DragDropOntoImageQuestion.prototype.getNextDrag = function(group, drag) {\n var choice,\n numChoices = this.noOfChoicesInGroup(group);\n\n if (drag.length === 0) {\n choice = 1; // Was empty, so we want to select the first choice.\n } else {\n choice = this.getChoice(drag) + 1;\n }\n\n var next = this.getUnplacedChoice(group, choice);\n while (next.length === 0 && choice < numChoices) {\n choice++;\n next = this.getUnplacedChoice(group, choice);\n }\n\n return next;\n };\n\n /**\n * Choose the previous drag in a group.\n *\n * @param {int} group which group.\n * @param {jQuery} drag current choice (empty jQuery if there isn't one).\n * @return {jQuery} the next drag in that group, or null if there wasn't one.\n */\n DragDropOntoImageQuestion.prototype.getPreviousDrag = function(group, drag) {\n var choice;\n\n if (drag.length === 0) {\n choice = this.noOfChoicesInGroup(group);\n } else {\n choice = this.getChoice(drag) - 1;\n }\n\n var previous = this.getUnplacedChoice(group, choice);\n while (previous.length === 0 && choice > 1) {\n choice--;\n previous = this.getUnplacedChoice(group, choice);\n }\n\n // Does this choice exist?\n return previous;\n };\n\n /**\n * Animate an object to the given destination.\n *\n * @param {jQuery} drag the element to be animated.\n * @param {jQuery} target element marking the place to move it to.\n */\n DragDropOntoImageQuestion.prototype.animateTo = function(drag, target) {\n var currentPos = drag.offset(),\n targetPos = target.offset(),\n thisQ = this;\n\n M.util.js_pending('qtype_ddimageortext-animate-' + thisQ.containerId);\n // Animate works in terms of CSS position, whereas locating an object\n // on the page works best with jQuery offset() function. So, to get\n // the right target position, we work out the required change in\n // offset() and then add that to the current CSS position.\n drag.animate(\n {\n left: parseInt(drag.css('left')) + targetPos.left - currentPos.left,\n top: parseInt(drag.css('top')) + targetPos.top - currentPos.top\n },\n {\n duration: 'fast',\n done: function() {\n $('body').trigger('qtype_ddimageortext-dragmoved', [drag, target, thisQ]);\n M.util.js_complete('qtype_ddimageortext-animate-' + thisQ.containerId);\n }\n }\n );\n };\n\n /**\n * Detect if a point is inside a given DOM node.\n *\n * @param {Number} pageX the x position.\n * @param {Number} pageY the y position.\n * @param {jQuery} drop the node to check (typically a drop).\n * @return {boolean} whether the point is inside the node.\n */\n DragDropOntoImageQuestion.prototype.isPointInDrop = function(pageX, pageY, drop) {\n var position = drop.offset();\n if (drop.hasClass('draghome')) {\n return pageX >= position.left && pageX < position.left + drop.outerWidth()\n && pageY >= position.top && pageY < position.top + drop.outerHeight();\n }\n return pageX >= position.left && pageX < position.left + drop.width()\n && pageY >= position.top && pageY < position.top + drop.height();\n };\n\n /**\n * Set the value of the hidden input for a place, to record what is currently there.\n *\n * @param {int} place which place to set the input value for.\n * @param {int} choice the value to set.\n */\n DragDropOntoImageQuestion.prototype.setInputValue = function(place, choice) {\n this.getRoot().find('input.placeinput.place' + place).val(choice);\n };\n\n /**\n * Get the outer div for this question.\n *\n * @returns {jQuery} containing that div.\n */\n DragDropOntoImageQuestion.prototype.getRoot = function() {\n return $(document.getElementById(this.containerId));\n };\n\n /**\n * Get the img that is the background image.\n * @returns {jQuery} containing that img.\n */\n DragDropOntoImageQuestion.prototype.bgImage = function() {\n return this.getRoot().find('img.dropbackground');\n };\n\n /**\n * Get drag home for a given choice.\n *\n * @param {int} group the group.\n * @param {int} choice the choice number.\n * @returns {jQuery} containing that div.\n */\n DragDropOntoImageQuestion.prototype.getDragHome = function(group, choice) {\n if (!this.getRoot().find('.draghome.dragplaceholder.group' + group + '.choice' + choice).is(':visible')) {\n return this.getRoot().find('.dragitemgroup' + group +\n ' .draghome.infinite' +\n '.choice' + choice +\n '.group' + group);\n }\n return this.getRoot().find('.draghome.dragplaceholder.group' + group + '.choice' + choice);\n };\n\n /**\n * Get an unplaced choice for a particular group.\n *\n * @param {int} group the group.\n * @param {int} choice the choice number.\n * @returns {jQuery} jQuery wrapping the unplaced choice. If there isn't one, the jQuery will be empty.\n */\n DragDropOntoImageQuestion.prototype.getUnplacedChoice = function(group, choice) {\n return this.getRoot().find('.ddarea .draghome.group' + group + '.choice' + choice + '.unplaced').slice(0, 1);\n };\n\n /**\n * Get the drag that is currently in a given place.\n *\n * @param {int} place the place number.\n * @return {jQuery} the current drag (or an empty jQuery if none).\n */\n DragDropOntoImageQuestion.prototype.getCurrentDragInPlace = function(place) {\n return this.getRoot().find('.ddarea .draghome.inplace' + place);\n };\n\n /**\n * Return the number of blanks in a given group.\n *\n * @param {int} group the group number.\n * @returns {int} the number of drops.\n */\n DragDropOntoImageQuestion.prototype.noOfDropsInGroup = function(group) {\n return this.getRoot().find('.dropzone.group' + group).length;\n };\n\n /**\n * Return the number of choices in a given group.\n *\n * @param {int} group the group number.\n * @returns {int} the number of choices.\n */\n DragDropOntoImageQuestion.prototype.noOfChoicesInGroup = function(group) {\n return this.getRoot().find('.dragitemgroup' + group + ' .draghome').length;\n };\n\n /**\n * Return the number at the end of the CSS class name with the given prefix.\n *\n * @param {jQuery} node\n * @param {String} prefix name prefix\n * @returns {Number|null} the suffix if found, else null.\n */\n DragDropOntoImageQuestion.prototype.getClassnameNumericSuffix = function(node, prefix) {\n var classes = node.attr('class');\n if (classes !== '') {\n var classesArr = classes.split(' ');\n for (var index = 0; index < classesArr.length; index++) {\n var patt1 = new RegExp('^' + prefix + '([0-9])+$');\n if (patt1.test(classesArr[index])) {\n var patt2 = new RegExp('([0-9])+$');\n var match = patt2.exec(classesArr[index]);\n return Number(match[0]);\n }\n }\n }\n return null;\n };\n\n /**\n * Get the choice number of a drag.\n *\n * @param {jQuery} drag the drag.\n * @returns {Number} the choice number.\n */\n DragDropOntoImageQuestion.prototype.getChoice = function(drag) {\n return this.getClassnameNumericSuffix(drag, 'choice');\n };\n\n /**\n * Given a DOM node that is significant to this question\n * (drag, drop, ...) get the group it belongs to.\n *\n * @param {jQuery} node a DOM node.\n * @returns {Number} the group it belongs to.\n */\n DragDropOntoImageQuestion.prototype.getGroup = function(node) {\n return this.getClassnameNumericSuffix(node, 'group');\n };\n\n /**\n * Get the place number of a drop, or its corresponding hidden input.\n *\n * @param {jQuery} node the DOM node.\n * @returns {Number} the place number.\n */\n DragDropOntoImageQuestion.prototype.getPlace = function(node) {\n return this.getClassnameNumericSuffix(node, 'place');\n };\n\n /**\n * Get drag clone for a given drag.\n *\n * @param {jQuery} drag the drag.\n * @returns {jQuery} the drag's clone.\n */\n DragDropOntoImageQuestion.prototype.getDragClone = function(drag) {\n return this.getRoot().find('.dragitemgroup' +\n this.getGroup(drag) +\n ' .draghome' +\n '.choice' + this.getChoice(drag) +\n '.group' + this.getGroup(drag) +\n '.dragplaceholder');\n };\n\n /**\n * Get infinite drag clones for given drag.\n *\n * @param {jQuery} drag the drag.\n * @param {Boolean} inHome in the home area or not.\n * @returns {jQuery} the drag's clones.\n */\n DragDropOntoImageQuestion.prototype.getInfiniteDragClones = function(drag, inHome) {\n if (inHome) {\n return this.getRoot().find('.dragitemgroup' +\n this.getGroup(drag) +\n ' .draghome' +\n '.choice' + this.getChoice(drag) +\n '.group' + this.getGroup(drag) +\n '.infinite').not('.dragplaceholder');\n }\n return this.getRoot().find('.draghome' +\n '.choice' + this.getChoice(drag) +\n '.group' + this.getGroup(drag) +\n '.infinite').not('.dragplaceholder');\n };\n\n /**\n * Get drop for a given drag and place.\n *\n * @param {jQuery} drag the drag.\n * @param {Integer} currentPlace the current place of drag.\n * @returns {jQuery} the drop's clone.\n */\n DragDropOntoImageQuestion.prototype.getDrop = function(drag, currentPlace) {\n return this.getRoot().find('.dropzone.group' + this.getGroup(drag) + '.place' + currentPlace);\n };\n\n /**\n * Handle when the window is resized.\n */\n DragDropOntoImageQuestion.prototype.handleResize = function() {\n var thisQ = this,\n bgRatio = this.bgRatio();\n if (this.isPrinting) {\n bgRatio = 1;\n }\n\n this.getRoot().find('.ddarea .dropzone').each(function(i, dropNode) {\n $(dropNode)\n .css('left', parseInt($(dropNode).data('originX')) * parseFloat(bgRatio))\n .css('top', parseInt($(dropNode).data('originY')) * parseFloat(bgRatio));\n thisQ.handleElementScale(dropNode, 'left top');\n });\n\n this.getRoot().find('div.droparea .draghome').not('.beingdragged').each(function(key, drag) {\n $(drag)\n .css('left', parseFloat($(drag).data('originX')) * parseFloat(bgRatio))\n .css('top', parseFloat($(drag).data('originY')) * parseFloat(bgRatio));\n thisQ.handleElementScale(drag, 'left top');\n });\n };\n\n /**\n * Return the background ratio.\n *\n * @returns {number} Background ratio.\n */\n DragDropOntoImageQuestion.prototype.bgRatio = function() {\n var bgImg = this.bgImage();\n var bgImgNaturalWidth = bgImg.get(0).naturalWidth;\n var bgImgClientWidth = bgImg.width();\n\n return bgImgClientWidth / bgImgNaturalWidth;\n };\n\n /**\n * Scale the drag if needed.\n *\n * @param {jQuery} element the item to place.\n * @param {String} type scaling type\n */\n DragDropOntoImageQuestion.prototype.handleElementScale = function(element, type) {\n var bgRatio = parseFloat(this.bgRatio());\n if (this.isPrinting) {\n bgRatio = 1;\n }\n $(element).css({\n '-webkit-transform': 'scale(' + bgRatio + ')',\n '-moz-transform': 'scale(' + bgRatio + ')',\n '-ms-transform': 'scale(' + bgRatio + ')',\n '-o-transform': 'scale(' + bgRatio + ')',\n 'transform': 'scale(' + bgRatio + ')',\n 'transform-origin': type\n });\n };\n\n /**\n * Calculate z-index value.\n *\n * @returns {number} z-index value\n */\n DragDropOntoImageQuestion.prototype.calculateZIndex = function() {\n var zIndex = 0;\n this.getRoot().find('.ddarea .dropzone, div.droparea .draghome').each(function(i, dropNode) {\n dropNode = $(dropNode);\n // Note that webkit browsers won't return the z-index value from the CSS stylesheet\n // if the element doesn't have a position specified. Instead it'll return \"auto\".\n var itemZIndex = dropNode.css('z-index') ? parseInt(dropNode.css('z-index')) : 0;\n\n if (itemZIndex > zIndex) {\n zIndex = itemZIndex;\n }\n });\n\n return zIndex;\n };\n\n /**\n * Check that the drag is drop to it's clone.\n *\n * @param {jQuery} drag The drag.\n * @param {jQuery} drop The drop.\n * @returns {boolean}\n */\n DragDropOntoImageQuestion.prototype.isDragSameAsDrop = function(drag, drop) {\n return this.getChoice(drag) === this.getChoice(drop) && this.getGroup(drag) === this.getGroup(drop);\n };\n\n /**\n * Singleton object that handles all the DragDropOntoImageQuestions\n * on the page, and deals with event dispatching.\n * @type {Object}\n */\n var questionManager = {\n\n /**\n * {boolean} ensures that the event handlers are only initialised once per page.\n */\n eventHandlersInitialised: false,\n\n /**\n * {Object} ensures that the drag event handlers are only initialised once per question,\n * indexed by containerId (id on the .que div).\n */\n dragEventHandlersInitialised: {},\n\n /**\n * {boolean} is printing or not.\n */\n isPrinting: false,\n\n /**\n * {boolean} is keyboard navigation or not.\n */\n isKeyboardNavigation: false,\n\n /**\n * {Object} all the questions on this page, indexed by containerId (id on the .que div).\n */\n questions: {}, // An object containing all the information about each question on the page.\n\n /**\n * Initialise one question.\n *\n * @method\n * @param {String} containerId the id of the div.que that contains this question.\n * @param {boolean} readOnly whether the question is read-only.\n * @param {Array} places data.\n */\n init: function(containerId, readOnly, places) {\n questionManager.questions[containerId] =\n new DragDropOntoImageQuestion(containerId, readOnly, places);\n if (!questionManager.eventHandlersInitialised) {\n questionManager.setupEventHandlers();\n questionManager.eventHandlersInitialised = true;\n }\n if (!questionManager.dragEventHandlersInitialised.hasOwnProperty(containerId)) {\n questionManager.dragEventHandlersInitialised[containerId] = true;\n // We do not use the body event here to prevent the other event on Mobile device, such as scroll event.\n var questionContainer = document.getElementById(containerId);\n if (questionContainer.classList.contains('ddimageortext') &&\n !questionContainer.classList.contains('qtype_ddimageortext-readonly')) {\n // TODO: Convert all the jQuery selectors and events to native Javascript.\n questionManager.addEventHandlersToDrag($(questionContainer).find('.draghome'));\n }\n }\n },\n\n /**\n * Set up the event handlers that make this question type work. (Done once per page.)\n */\n setupEventHandlers: function() {\n $('body')\n .on('keydown',\n '.que.ddimageortext:not(.qtype_ddimageortext-readonly) .dropzones .dropzone',\n questionManager.handleKeyPress)\n .on('keydown',\n '.que.ddimageortext:not(.qtype_ddimageortext-readonly) .draghome.placed:not(.beingdragged)',\n questionManager.handleKeyPress)\n .on('qtype_ddimageortext-dragmoved', questionManager.handleDragMoved);\n $(window).on('resize', function() {\n questionManager.handleWindowResize(false);\n });\n window.addEventListener('beforeprint', function() {\n questionManager.isPrinting = true;\n questionManager.handleWindowResize(questionManager.isPrinting);\n });\n window.addEventListener('afterprint', function() {\n questionManager.isPrinting = false;\n questionManager.handleWindowResize(questionManager.isPrinting);\n });\n setTimeout(function() {\n questionManager.fixLayoutIfThingsMoved();\n }, 100);\n },\n\n /**\n * Binding the drag/touch event again for newly created element.\n *\n * @param {jQuery} element Element to bind the event\n */\n addEventHandlersToDrag: function(element) {\n // Unbind all the mousedown and touchstart events to prevent double binding.\n element.unbind('mousedown touchstart');\n element.on('mousedown touchstart', questionManager.handleDragStart);\n },\n\n /**\n * Handle mouse down / touch start events on drags.\n * @param {Event} e the DOM event.\n */\n handleDragStart: function(e) {\n e.preventDefault();\n var question = questionManager.getQuestionForEvent(e);\n if (question) {\n question.handleDragStart(e);\n }\n },\n\n /**\n * Handle key down / press events on drags.\n * @param {KeyboardEvent} e\n */\n handleKeyPress: function(e) {\n if (questionManager.isKeyboardNavigation) {\n return;\n }\n questionManager.isKeyboardNavigation = true;\n var question = questionManager.getQuestionForEvent(e);\n if (question) {\n question.handleKeyPress(e);\n }\n },\n\n /**\n * Handle when the window is resized.\n * @param {boolean} isPrinting\n */\n handleWindowResize: function(isPrinting) {\n for (var containerId in questionManager.questions) {\n if (questionManager.questions.hasOwnProperty(containerId)) {\n questionManager.questions[containerId].isPrinting = isPrinting;\n questionManager.questions[containerId].handleResize();\n }\n }\n },\n\n /**\n * Sometimes, despite our best efforts, things change in a way that cannot\n * be specifically caught (e.g. dock expanding or collapsing in Boost).\n * Therefore, we need to periodically check everything is in the right position.\n */\n fixLayoutIfThingsMoved: function() {\n this.handleWindowResize(questionManager.isPrinting);\n // We use setTimeout after finishing work, rather than setInterval,\n // in case positioning things is slow. We want 100 ms gap\n // between executions, not what setInterval does.\n setTimeout(function() {\n questionManager.fixLayoutIfThingsMoved(questionManager.isPrinting);\n }, 100);\n },\n\n /**\n * Handle when drag moved.\n *\n * @param {Event} e the event.\n * @param {jQuery} drag the drag\n * @param {jQuery} target the target\n * @param {DragDropOntoImageQuestion} thisQ the question.\n */\n handleDragMoved: function(e, drag, target, thisQ) {\n drag.removeClass('beingdragged').css('z-index', '');\n drag.css('top', target.position().top).css('left', target.position().left);\n target.after(drag);\n target.removeClass('active');\n if (typeof drag.data('unplaced') !== 'undefined' && drag.data('unplaced') === true) {\n drag.removeClass('placed').addClass('unplaced');\n drag.removeAttr('tabindex');\n drag.removeData('unplaced');\n drag.css('top', '')\n .css('left', '')\n .css('transform', '');\n if (drag.hasClass('infinite') && thisQ.getInfiniteDragClones(drag, true).length > 1) {\n thisQ.getInfiniteDragClones(drag, true).first().remove();\n }\n } else {\n drag.data('originX', target.data('originX')).data('originY', target.data('originY'));\n thisQ.handleElementScale(drag, 'left top');\n }\n if (typeof drag.data('isfocus') !== 'undefined' && drag.data('isfocus') === true) {\n drag.focus();\n drag.removeData('isfocus');\n }\n if (typeof target.data('isfocus') !== 'undefined' && target.data('isfocus') === true) {\n target.removeData('isfocus');\n }\n if (questionManager.isKeyboardNavigation) {\n questionManager.isKeyboardNavigation = false;\n }\n },\n\n /**\n * Given an event, work out which question it effects.\n * @param {Event} e the event.\n * @returns {DragDropOntoImageQuestion|undefined} The question, or undefined.\n */\n getQuestionForEvent: function(e) {\n var containerId = $(e.currentTarget).closest('.que.ddimageortext').attr('id');\n return questionManager.questions[containerId];\n }\n };\n\n /**\n * @alias module:qtype_ddimageortext/question\n */\n return {\n init: questionManager.init\n };\n});\n"],"file":"question.min.js"}