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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/form\n * @package qtype_ddimageortext\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'], function($, dragDrop) {\n\n \"use strict\";\n\n /**\n * Singleton object to handle progressive enhancement of the\n * drag-drop onto image question editing form.\n * @type {Object}\n */\n var dragDropToImageForm = {\n /**\n * @var {Object} with properties width and height.\n */\n maxBgImageSize: null,\n\n /**\n * @var {Object} with properties width and height.\n */\n maxDragImageSize: null,\n\n /**\n * @var {object} for interacting with the file pickers.\n */\n fp: null, // Object containing functions associated with the file picker.\n\n /**\n * Initialise the form javascript features.\n *\n * @param {Object} maxBgImageSize object with two properties: width and height.\n * @param {Object} maxDragImageSize object with two properties: width and height.\n */\n init: function(maxBgImageSize, maxDragImageSize) {\n dragDropToImageForm.maxBgImageSize = maxBgImageSize;\n dragDropToImageForm.maxDragImageSize = maxDragImageSize;\n dragDropToImageForm.fp = dragDropToImageForm.filePickers();\n\n $('#id_previewareaheader').append(\n '<div class=\"ddarea que ddimageortext\">' +\n ' <div class=\"droparea\">' +\n ' <img class=\"dropbackground\" />' +\n ' <div class=\"dropzones\"></div>' +\n ' </div>' +\n ' <div class=\"dragitems\"></div>' +\n '</div>');\n\n dragDropToImageForm.updateVisibilityOfFilePickers();\n dragDropToImageForm.setOptionsForDragItemSelectors();\n dragDropToImageForm.setupEventHandlers();\n dragDropToImageForm.waitForFilePickerToInitialise();\n },\n\n /**\n * Waits for the file-pickers to be sufficiently ready before initialising the preview.\n */\n waitForFilePickerToInitialise: function() {\n if (dragDropToImageForm.fp.file('bgimage').href === null) {\n // It would be better to use an onload or onchange event rather than this timeout.\n // Unfortunately attempts to do this early are overwritten by filepicker during its loading.\n setTimeout(dragDropToImageForm.waitForFilePickerToInitialise, 1000);\n return;\n }\n M.util.js_pending('dragDropToImageForm');\n\n // From now on, when a new file gets loaded into the filepicker, update the preview.\n // This is not in the setupEventHandlers section as it needs to be delayed until\n // after filepicker's javascript has finished.\n $('form.mform').on('change', '.filepickerhidden', function() {\n M.util.js_pending('dragDropToImageForm');\n dragDropToImageForm.loadPreviewImage();\n });\n\n dragDropToImageForm.loadPreviewImage();\n },\n\n /**\n * Loads the preview background image.\n */\n loadPreviewImage: function() {\n $('fieldset#id_previewareaheader .dropbackground')\n .one('load', dragDropToImageForm.afterPreviewImageLoaded)\n .attr('src', dragDropToImageForm.fp.file('bgimage').href);\n },\n\n /**\n * After the background image is loaded, continue setting up the preview.\n */\n afterPreviewImageLoaded: function() {\n var bgImg = $('fieldset#id_previewareaheader .dropbackground');\n dragDropToImageForm.constrainImageSize(bgImg, dragDropToImageForm.maxBgImageSize);\n dragDropToImageForm.createDropZones();\n M.util.js_complete('dragDropToImageForm');\n },\n\n /**\n * Limits an image display size to the given maximums.\n *\n * @param {jQuery} img the image.\n * @param {Object} maxSize with width and height properties.\n */\n constrainImageSize: function(img, maxSize) {\n var reduceby = Math.max(img.width() / maxSize.width,\n img.height() / maxSize.height);\n if (reduceby > 1) {\n img.css('width', Math.floor(img.width() / reduceby));\n }\n img.addClass('constrained');\n },\n\n /**\n * Create, or recreate all the drop zones.\n */\n createDropZones: function() {\n var dropZoneHolder = $('.dropzones');\n dropZoneHolder.empty();\n\n var bgimageurl = dragDropToImageForm.fp.file('bgimage').href;\n if (bgimageurl === null) {\n return; // There is not currently a valid preview to update.\n }\n\n var numDrops = dragDropToImageForm.form.getFormValue('nodropzone', []);\n for (var dropNo = 0; dropNo < numDrops; dropNo++) {\n var dragNo = dragDropToImageForm.form.getFormValue('drops', [dropNo, 'choice']);\n if (dragNo === '0') {\n continue;\n }\n dragNo = dragNo - 1;\n var group = dragDropToImageForm.form.getFormValue('drags', [dragNo, 'draggroup']),\n label = dragDropToImageForm.form.getFormValue('draglabel', [dragNo]);\n if ('image' === dragDropToImageForm.form.getFormValue('drags', [dragNo, 'dragitemtype'])) {\n var imgUrl = dragDropToImageForm.fp.file('dragitem[' + dragNo + ']').href;\n if (imgUrl === null) {\n continue;\n }\n // Althoug these are previews of drops, we also add the class name 'drag',\n dropZoneHolder.append('<img class=\"droppreview group' + group + ' drop' + dropNo +\n '\" src=\"' + imgUrl + '\" alt=\"' + label + '\" data-drop-no=\"' + dropNo + '\">');\n\n } else if (label !== '') {\n dropZoneHolder.append('<div class=\"droppreview group' + group + ' drop' + dropNo +\n '\" data-drop-no=\"' + dropNo + '\">' + label + '</div>');\n }\n }\n\n dragDropToImageForm.waitForAllDropImagesToBeLoaded();\n },\n\n /**\n * This polls until all the drop-zone images have loaded, and then calls updateDropZones().\n */\n waitForAllDropImagesToBeLoaded: function() {\n var notYetLoadedImages = $('.dropzones img').not(function(i, imgNode) {\n return dragDropToImageForm.imageIsLoaded(imgNode);\n });\n\n if (notYetLoadedImages.length > 0) {\n setTimeout(function() {\n dragDropToImageForm.waitForAllDropImagesToBeLoaded();\n }, 100);\n return;\n }\n\n dragDropToImageForm.updateDropZones();\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 imageIsLoaded: function(imgElement) {\n return imgElement.complete && imgElement.naturalHeight !== 0;\n },\n\n /**\n * Set the size and position of all the drop zones.\n */\n updateDropZones: function() {\n var bgimageurl = dragDropToImageForm.fp.file('bgimage').href;\n if (bgimageurl === null) {\n return; // There is not currently a valid preview to update.\n }\n\n var dropBackgroundPosition = $('fieldset#id_previewareaheader .dropbackground').offset(),\n numDrops = dragDropToImageForm.form.getFormValue('nodropzone', []);\n\n // Move each drop to the right position and update the text.\n for (var dropNo = 0; dropNo < numDrops; dropNo++) {\n var drop = $('.dropzones .drop' + dropNo);\n if (drop.length === 0) {\n continue;\n }\n var dragNo = dragDropToImageForm.form.getFormValue('drops', [dropNo, 'choice']) - 1;\n\n drop.offset({\n left: dropBackgroundPosition.left +\n parseInt(dragDropToImageForm.form.getFormValue('drops', [dropNo, 'xleft'])),\n top: dropBackgroundPosition.top +\n parseInt(dragDropToImageForm.form.getFormValue('drops', [dropNo, 'ytop']))\n });\n\n var label = dragDropToImageForm.form.getFormValue('draglabel', [dragNo]);\n if (drop.is('img')) {\n drop.attr('alt', label);\n } else {\n drop.html(label);\n }\n }\n\n // Resize them to the same size.\n $('.dropzones .droppreview').css('padding', '0');\n var numGroups = $('select.draggroup').first().find('option').length;\n for (var group = 1; group <= numGroups; group++) {\n dragDropToImageForm.resizeAllDragsAndDropsInGroup(group);\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 resizeAllDragsAndDropsInGroup: function(group) {\n var drops = $('.dropzones .droppreview.group' + group),\n maxWidth = 0,\n maxHeight = 0;\n\n // Find the maximum size of any drag in this groups.\n drops.each(function(i, drop) {\n maxWidth = Math.max(maxWidth, Math.ceil(drop.offsetWidth));\n maxHeight = Math.max(maxHeight, Math.ceil(drop.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 drops.each(function(i, drop) {\n var left = Math.round((maxWidth - drop.offsetWidth) / 2),\n top = Math.floor((maxHeight - drop.offsetHeight) / 2);\n // Set top and left padding so the item is centred.\n $(drop).css({\n 'padding-left': left + 'px',\n 'padding-right': (maxWidth - drop.offsetWidth - left) + 'px',\n 'padding-top': top + 'px',\n 'padding-bottom': (maxHeight - drop.offsetHeight - top) + 'px'\n });\n });\n },\n\n /**\n * Events linked to form actions.\n */\n setupEventHandlers: function() {\n // Changes to settings in the draggable items section.\n $('fieldset#id_draggableitemheader')\n .on('change input', 'input, select', function(e) {\n var input = $(e.target).closest('select, input');\n if (input.hasClass('dragitemtype')) {\n dragDropToImageForm.updateVisibilityOfFilePickers();\n }\n\n dragDropToImageForm.setOptionsForDragItemSelectors();\n\n if (input.is('.dragitemtype, .draggroup')) {\n dragDropToImageForm.createDropZones();\n } else if (input.is('.draglabel')) {\n dragDropToImageForm.updateDropZones();\n }\n });\n\n // Changes to Drop zones section: left, top and drag item.\n $('fieldset#id_dropzoneheader').on('change input', 'input, select', function(e) {\n var input = $(e.target).closest('select, input');\n if (input.is('select')) {\n dragDropToImageForm.createDropZones();\n } else {\n dragDropToImageForm.updateDropZones();\n }\n });\n\n // Moving drop zones in the preview.\n $('fieldset#id_previewareaheader').on('mousedown touchstart', '.droppreview', function(e) {\n dragDropToImageForm.dragStart(e);\n });\n\n $(window).on('resize', function() {\n dragDropToImageForm.updateDropZones();\n });\n },\n\n /**\n * Update all the drag item filepickers, so they are only shown for\n */\n updateVisibilityOfFilePickers: function() {\n var numDrags = dragDropToImageForm.form.getFormValue('noitems', []);\n for (var dragNo = 0; dragNo < numDrags; dragNo++) {\n var picker = $('input#id_dragitem_' + dragNo).closest('.fitem_ffilepicker');\n if ('image' === dragDropToImageForm.form.getFormValue('drags', [dragNo, 'dragitemtype'])) {\n picker.show();\n } else {\n picker.hide();\n }\n }\n },\n\n\n setOptionsForDragItemSelectors: function() {\n var dragItemOptions = {'0': ''},\n numDrags = dragDropToImageForm.form.getFormValue('noitems', []),\n numDrops = dragDropToImageForm.form.getFormValue('nodropzone', []);\n\n // Work out the list of options.\n for (var dragNo = 0; dragNo < numDrags; dragNo++) {\n var label = dragDropToImageForm.form.getFormValue('draglabel', [dragNo]);\n var file = dragDropToImageForm.fp.file(dragDropToImageForm.form.toNameWithIndex('dragitem', [dragNo]));\n if ('image' === dragDropToImageForm.form.getFormValue('drags', [dragNo, 'dragitemtype']) && file.name !== null) {\n dragItemOptions[dragNo + 1] = (dragNo + 1) + '. ' + label + ' (' + file.name + ')';\n } else if (label !== '') {\n dragItemOptions[dragNo + 1] = (dragNo + 1) + '. ' + label;\n }\n }\n\n // Initialise each select.\n for (var dropNo = 0; dropNo < numDrops; dropNo++) {\n var selector = $('#id_drops_' + dropNo + '_choice');\n\n var selectedvalue = selector.val();\n selector.find('option').remove();\n for (var value in dragItemOptions) {\n if (!dragItemOptions.hasOwnProperty(value)) {\n continue;\n }\n selector.append('<option value=\"' + value + '\">' + dragItemOptions[value] + '</option>');\n var optionnode = selector.find('option[value=\"' + value + '\"]');\n if (parseInt(value) === parseInt(selectedvalue)) {\n optionnode.attr('selected', true);\n } else if (dragDropToImageForm.isItemUsed(parseInt(value))) {\n optionnode.attr('disabled', true);\n }\n }\n }\n },\n\n /**\n * Checks if the specified drag option is already used somewhere.\n *\n * @param {Number} value of the drag item to check\n * @return {Boolean} true if item is allocated to dropzone\n */\n isItemUsed: function(value) {\n if (value === 0) {\n return false; // None option can always be selected.\n }\n\n if (dragDropToImageForm.form.getFormValue('drags', [value - 1, 'infinite'])) {\n return false; // Infinite, so can't be used up.\n }\n\n return $('fieldset#id_dropzoneheader select').filter(function(i, selectNode) {\n return parseInt($(selectNode).val()) === value;\n }).length !== 0;\n },\n\n /**\n * Handles when a dropzone in dragged in the preview.\n * @param {Object} e Event object\n */\n dragStart: function(e) {\n var drop = $(e.target).closest('.droppreview');\n\n var info = dragDrop.prepare(e);\n if (!info.start) {\n return;\n }\n\n dragDrop.start(e, drop, function(x, y, drop) {\n dragDropToImageForm.dragMove(drop);\n }, function() {\n dragDropToImageForm.dragEnd();\n });\n },\n\n /**\n * Handles update while a drop is being dragged.\n *\n * @param {jQuery} drop the drop preview being moved.\n */\n dragMove: function(drop) {\n var backgroundImage = $('fieldset#id_previewareaheader .dropbackground'),\n backgroundPosition = backgroundImage.offset(),\n dropNo = drop.data('dropNo'),\n dropPosition = drop.offset(),\n left = Math.round(dropPosition.left - backgroundPosition.left),\n top = Math.round(dropPosition.top - backgroundPosition.top);\n\n // Constrain coordinates to be inside the background.\n // The -10 here matches the +10 in resizeAllDragsAndDropsInGroup().\n left = Math.max(0, Math.min(left, backgroundImage.width() - drop.width() - 10));\n top = Math.max(0, Math.min(top, backgroundImage.height() - drop.height() - 10));\n\n // Update the form.\n dragDropToImageForm.form.setFormValue('drops', [dropNo, 'xleft'], left);\n dragDropToImageForm.form.setFormValue('drops', [dropNo, 'ytop'], top);\n },\n\n /**\n * Handles when the drag ends.\n */\n dragEnd: function() {\n // Redraw, in case the position was constrained.\n dragDropToImageForm.updateDropZones();\n },\n\n /**\n * Low level operations on form.\n */\n form: {\n toNameWithIndex: function(name, indexes) {\n var indexString = name;\n for (var i = 0; i < indexes.length; i++) {\n indexString = indexString + '[' + indexes[i] + ']';\n }\n return indexString;\n },\n\n getEl: function(name, indexes) {\n var form = $('form.mform')[0];\n return form.elements[this.toNameWithIndex(name, indexes)];\n },\n\n /**\n * Helper to get the value of a form elements with name like \"drops[0][xleft]\".\n *\n * @param {String} name the base name, e.g. 'drops'.\n * @param {String[]} indexes the indexes, e.g. ['0', 'xleft'].\n * @return {String} the value of that field.\n */\n getFormValue: function(name, indexes) {\n var el = this.getEl(name, indexes);\n if (!el.type) {\n el = el[el.length - 1];\n }\n if (el.type === 'checkbox') {\n return el.checked;\n } else {\n return el.value;\n }\n },\n\n /**\n * Helper to get the value of a form elements with name like \"drops[0][xleft]\".\n *\n * @param {String} name the base name, e.g. 'drops'.\n * @param {String[]} indexes the indexes, e.g. ['0', 'xleft'].\n * @param {String|Number} value the value to set.\n */\n setFormValue: function(name, indexes, value) {\n var el = this.getEl(name, indexes);\n if (el.type === 'checkbox') {\n el.checked = value;\n } else {\n el.value = value;\n }\n }\n },\n\n /**\n * Utility to get the file name and url from the filepicker.\n * @returns {Object} object containing functions {file, name}\n */\n filePickers: function() {\n var draftItemIdsToName;\n var nameToParentNode;\n\n if (draftItemIdsToName === undefined) {\n draftItemIdsToName = {};\n nameToParentNode = {};\n var fp = $('form.mform input.filepickerhidden');\n fp.each(function(index, filepicker) {\n draftItemIdsToName[filepicker.value] = filepicker.name;\n nameToParentNode[filepicker.name] = filepicker.parentNode;\n });\n }\n\n return {\n file: function(name) {\n var parentNode = $(nameToParentNode[name]);\n var fileAnchor = parentNode.find('div.filepicker-filelist a');\n if (fileAnchor.length) {\n return {href: fileAnchor.get(0).href, name: fileAnchor.get(0).innerHTML};\n } else {\n return {href: null, name: null};\n }\n },\n\n name: function(draftitemid) {\n return draftItemIdsToName[draftitemid];\n }\n };\n }\n };\n\n /**\n * @alias module:qtype_ddimageortext/form\n */\n return {\n /**\n * Initialise the form JavaScript features.\n *\n * @param {Object} maxBgImageSize object with two properties: width and height.\n * @param {Object} maxDragImageSize object with two properties: width and height.\n */\n init: dragDropToImageForm.init\n };\n});\n"],"file":"form.min.js"}