Proyectos de Subversion Moodle

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**

 * Javascript library for enableing a drag and drop upload interface

 *

 * @package    moodlecore

 * @subpackage form

 * @copyright  2011 Davo Smith

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

M.form_dndupload = {}

M.form_dndupload.init = function(Y, options) {

    var dnduploadhelper = {

        // YUI object.

        Y: null,

        // URL for upload requests

        url: M.cfg.wwwroot + '/repository/repository_ajax.php?action=upload',

        // options may include: itemid, acceptedtypes, maxfiles, maxbytes, clientid, repositoryid, author, contextid

        options: {},

        // itemid used for repository upload

        itemid: null,

        // accepted filetypes accepted by this form passed to repository

        acceptedtypes: [],

        // maximum size of files allowed in this form

        maxbytes: 0,

        // Maximum combined size of files allowed in this form. {@link FILE_AREA_MAX_BYTES_UNLIMITED}

        areamaxbytes: -1,

        // unqiue id of this form field used for html elements

        clientid: '',

        // upload repository id, used for upload

        repositoryid: 0,

        // container which holds the node which recieves drag events

        container: null,

        // filemanager element we are working with

        filemanager: null,

        // callback  to filepicker element to refesh when uploaded

        callback: null,

        // Nasty hack to distinguish between dragenter(first entry),

        // dragenter+dragleave(moving between child elements) and dragleave (leaving element)

        entercount: 0,

        pageentercount: 0,

        // Holds the progress bar elements for each file.

        progressbars: {},

        // Number of request in queue and number of request uploading.

        totalOfRequest: 0,

        // Number of request upload.

        numberOfRequestUpload: 0,

        /**

         * Initalise the drag and drop upload interface

         * Note: one and only one of options.filemanager and options.formcallback must be defined

         *

         * @param Y the YUI object

         * @param object options {

         *            itemid: itemid used for repository upload in this form

         *            acceptdtypes: accepted filetypes by this form

         *            maxfiles: maximum number of files this form allows

         *            maxbytes: maximum size of files allowed in this form

         *            areamaxbytes: maximum combined size of files allowed in this form

         *            clientid: unqiue id of this form field used for html elements

         *            contextid: id of the current cotnext

         *            containerid: htmlid of container

         *            repositories: array of repository objects passed from filepicker

         *            filemanager: filemanager element we are working with

         *            formcallback: callback  to filepicker element to refesh when uploaded

         *          }

         */

        init: function(Y, options) {

            this.Y = Y;

            if (!this.browser_supported()) {

                Y.one('body').addClass('dndnotsupported');

                return; // Browser does not support the required functionality

            }

            // try and retrieve enabled upload repository

            this.repositoryid = this.get_upload_repositoryid(options.repositories);

            if (!this.repositoryid) {

                Y.one('body').addClass('dndnotsupported');

                return; // no upload repository is enabled to upload to

            }

            Y.one('body').addClass('dndsupported');

            this.options = options;

            this.acceptedtypes = options.acceptedtypes;

            this.clientid = options.clientid;

            this.maxbytes = options.maxbytes;

            this.areamaxbytes = options.areamaxbytes;

            this.itemid = options.itemid;

            this.author = options.author;

            this.container = this.Y.one('#'+options.containerid);

            if (options.filemanager) {

                // Needed to tell the filemanager to redraw when files uploaded

                // and to check how many files are already uploaded

                this.filemanager = options.filemanager;

            } else if (options.formcallback) {

                // Needed to tell the filepicker to update when a new

                // file is uploaded

                this.callback = options.formcallback;

            } else {

                if (M.cfg.developerdebug) {

                    alert('dndupload: Need to define either options.filemanager or options.formcallback');

                }

                return;

            }

            this.init_events();

            this.init_page_events();

        },

        /**

         * Check the browser has the required functionality

         * @return true if browser supports drag/drop upload

         */

        browser_supported: function() {

            if (typeof FileReader == 'undefined') {

                return false;

            }

            if (typeof FormData == 'undefined') {

                return false;

            }

            return true;

        },

        /**

         * Get upload repoistory from array of enabled repositories

         *

         * @param array repositories repository objects passed from filepicker

         * @param returns int id of upload repository or false if not found

         */

        get_upload_repositoryid: function(repositories) {

            for (var i in repositories) {

                if (repositories[i].type == "upload") {

                    return repositories[i].id;

                }

            }

            return false;

        },

        /**

         * Initialise drag events on node container, all events need

         * to be processed for drag and drop to work

         */

        init_events: function() {

            this.Y.on('dragenter', this.drag_enter, this.container, this);

            this.Y.on('dragleave', this.drag_leave, this.container, this);

            this.Y.on('dragover',  this.drag_over,  this.container, this);

            this.Y.on('drop',      this.drop,      this.container, this);

        },

        /**

         * Initialise whole-page events (to show / hide the 'drop files here'

         * message)

         */

        init_page_events: function() {

            this.Y.on('dragenter', this.drag_enter_page, 'body', this);

            this.Y.on('dragleave', this.drag_leave_page, 'body', this);

            this.Y.on('dragover', function(e) {

                e.preventDefault();

            }, 'body', this);

            this.Y.on('drop', function() {

                this.pageentercount = 0;

                this.hide_drop_target();

            }, 'body', this);

        },

        /**

         * Check if the filemanager / filepicker is disabled

         * @return bool - true if disabled

         */

        is_disabled: function() {

            return (this.container.ancestor('.fitem.disabled') != null);

        },

        /**

         * Show the 'drop files here' message when file(s) are dragged

         * onto the page

         */

        drag_enter_page: function(e) {

            if (this.is_disabled()) {

                return false;

            }

            if (!this.has_files(e)) {

                return false;

            }

            this.pageentercount++;

            if (this.pageentercount >= 2) {

                this.pageentercount = 2;

                return false;

            }

            this.show_drop_target();

            return false;

        },

        /**

         * Hide the 'drop files here' message when file(s) are dragged off

         * the page again

         */

        drag_leave_page: function(e) {

            this.pageentercount--;

            if (this.pageentercount == 1) {

                return false;

            }

            this.pageentercount = 0;

            this.hide_drop_target();

            return false;

        },

        /**

         * Check if the drag contents are valid and then call

         * preventdefault / stoppropagation to let the browser know

         * we will handle this drag/drop

         *

         * @param e event object

         * @return boolean true if a valid file drag event

         */

        check_drag: function(e) {

            if (this.is_disabled()) {

                return false;

            }

            if (!this.has_files(e)) {

                return false;

            }

            e.preventDefault();

            e.stopPropagation();

            return true;

        },

        /**

         * Handle a dragenter event, highlight the destination node

         * when a suitable drag event occurs

         */

        drag_enter: function(e) {

            if (!this.check_drag(e)) {

                return true;

            }

            this.entercount++;

            if (this.entercount >= 2) {

                this.entercount = 2; // Just moved over a child element - nothing to do

                return false;

            }

            // These lines are needed if the user has dragged something directly

            // from application onto the 'fileupload' box, without crossing another

            // part of the page first

            this.pageentercount = 2;

            this.show_drop_target();

            this.show_upload_ready();

            return false;

        },

        /**

         * Handle a dragleave event, Remove the highlight if dragged from

         * node

         */

        drag_leave: function(e) {

            if (!this.check_drag(e)) {

                return true;

            }

            this.entercount--;

            if (this.entercount == 1) {

                return false; // Just moved over a child element - nothing to do

            }

            this.entercount = 0;

            this.hide_upload_ready();

            return false;

        },

        /**

         * Handle a dragover event. Required to intercept to prevent the browser from

         * handling the drag and drop event as normal

         */

        drag_over: function(e) {

            if (!this.check_drag(e)) {

                return true;

            }

            return false;

        },

        /**

         * Handle a drop event.  Remove the highlight and then upload each

         * of the files (until we reach the file limit, or run out of files)

         */

        drop: function(e) {

            if (!this.check_drag(e, true)) {

                return true;

            }

            this.entercount = 0;

            this.pageentercount = 0;

            this.hide_upload_ready();

            this.hide_drop_target();

            var files = e._event.dataTransfer.files;

            if (this.filemanager) {

                var options = {

                    files: files,

                    options: this.options,

                    repositoryid: this.repositoryid,

                    currentfilecount: this.filemanager.filecount, // All files uploaded.

                    currentfiles: this.filemanager.options.list, // Only the current folder.

                    callback: Y.bind('update_filemanager', this),

                    callbackprogress: Y.bind('update_progress', this),

                    callbackcancel: Y.bind('hide_progress', this),

                    callbackNumberOfRequestUpload: {

                        get: Y.bind('getNumberOfRequestUpload', this),

                        increase: Y.bind('increaseNumberOfRequestUpload', this),

                        decrease: Y.bind('decreaseNumberOfRequestUpload', this),

                        getTotal: Y.bind('getTotalRequestUpload', this),

                        increaseTotal: Y.bind('increaseTotalRequest', this),

                        reset: Y.bind('resetNumberOfRequestUpload', this)

                    },

                    callbackClearProgress: Y.bind('clear_progress', this),

                    callbackStartProgress: Y.bind('startProgress', this),

                };

                this.show_progress();

                var uploader = new dnduploader(options);

                uploader.start_upload();

            } else {

                if (files.length >= 1) {

                    options = {

                        files:[files[0]],

                        options: this.options,

                        repositoryid: this.repositoryid,

                        currentfilecount: 0,

                        currentfiles: [],

                        callback: Y.bind('update_filemanager', this),

                        callbackprogress: Y.bind('update_progress', this),

                        callbackcancel: Y.bind('hide_progress', this),

                        callbackNumberOfRequestUpload: {

                            get: Y.bind('getNumberOfRequestUpload', this),

                            increase: Y.bind('increaseNumberOfRequestUpload', this),

                            decrease: Y.bind('decreaseNumberOfRequestUpload', this),

                            getTotal: Y.bind('getTotalRequestUpload', this),

                            increaseTotal: Y.bind('increaseTotalRequest', this),

                            reset: Y.bind('resetNumberOfRequestUpload', this)

                        },

                        callbackClearProgress: Y.bind('clear_progress', this),

                        callbackStartProgress: Y.bind('startProgress', this),

                    };

                    this.show_progress();

                    uploader = new dnduploader(options);

                    uploader.start_upload();

                }

            }

            return false;

        },

        /**

         * Increase number of request upload.

         */

        increaseNumberOfRequestUpload: function() {

            this.numberOfRequestUpload++;

        },

        /**

         * Increase total request.

         *

         * @param {number} newFileCount Number of new files.

         */

        increaseTotalRequest: function(newFileCount) {

            this.totalOfRequest += newFileCount;

        },

        /**

         * Decrease number of request upload.

         */

        decreaseNumberOfRequestUpload: function() {

            this.numberOfRequestUpload--;

        },

        /**

         * Return number of request upload.

         *

         * @returns {number}

         */

        getNumberOfRequestUpload: function() {

            return this.numberOfRequestUpload;

        },

        /**

         * Return number of request upload.

         *

         * @returns {number}

         */

        getTotalRequestUpload: function() {

            return this.totalOfRequest;

        },

        /**

         * Return number of request upload.

         *

         * @returns {number}

         */

        resetNumberOfRequestUpload: function() {

            this.numberOfRequestUpload = 0;

            this.totalOfRequest = 0;

        },

        /**

         * Check to see if the drag event has any files in it

         *

         * @param e event object

         * @return boolean true if event has files

         */

        has_files: function(e) {

            // In some browsers, dataTransfer.types may be null for a

            // 'dragover' event, so ensure a valid Array is always

            // inspected.

            var types = e._event.dataTransfer.types || [];

            for (var i=0; i<types.length; i++) {

                if (types[i] == 'Files') {

                    return true;

                }

            }

            return false;

        },

        /**

         * Highlight the area where files could be dropped

         */

        show_drop_target: function() {

            this.container.addClass('dndupload-ready');

        },

        hide_drop_target: function() {

            this.container.removeClass('dndupload-ready');

        },

        /**

         * Highlight the destination node (ready to drop)

         */

        show_upload_ready: function() {

            this.container.addClass('dndupload-over');

        },

        /**

         * Remove highlight on destination node

         */

        hide_upload_ready: function() {

            this.container.removeClass('dndupload-over');

        },

        /**

         * Show the element showing the upload in progress

         */

        show_progress: function() {

            this.container.addClass('dndupload-inprogress');

        },

        /**

         * Hide the element showing upload in progress

         */

        hide_progress: function() {

            if (!Object.keys(this.progressbars).length) {

                this.container.removeClass('dndupload-inprogress');

            }

        },

        /**

         * Tell the attached filemanager element (if any) to refresh on file

         * upload

         */

        update_filemanager: function(params) {

            this.clear_progress();

            this.hide_progress();

            if (this.filemanager) {

                // update the filemanager that we've uploaded the files

                this.filemanager.filepicker_callback();

            } else if (this.callback) {

                this.callback(params);

            }

        },

        /**

         * Clear the all progress bars.

         */

        clear_progress: function() {

            var filename;

            for (filename in this.progressbars) {

                if (this.progressbars.hasOwnProperty(filename)) {

                    this.progressbars[filename].progressouter.remove(true);

                    delete this.progressbars[filename];

                }

            }

        },

        /**

         * Show the current progress of the uploaded file.

         */

        update_progress: function(filename, percent) {

            this.startProgress(filename);

            this.progressbars[filename].progressinner.setStyle('width', percent + '%');

            this.progressbars[filename].progressinner.setAttribute('aria-valuenow', percent);

            this.progressbars[filename].progressinnertext.setContent(percent + '% ' + M.util.get_string('complete', 'moodle'));

        },

        /**

         * Start to show the progress of the uploaded file.

         *

         * @param {String} filename Name of file upload.

         */

        startProgress: function(filename) {

            if (this.progressbars[filename] === undefined) {

                var dispfilename = filename;

                if (dispfilename.length > 50) {

                    dispfilename = dispfilename.substr(0, 49) + '…';

                }

                var progressouter = this.container.create('<div>' + dispfilename +

                    '<div class="progress">' +

                    '   <div class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100">' +

                    '       <span class="visually-hidden"></span>' +

                    '   </div>' +

                    '</div></div>');

                var progressinner = progressouter.one('.progress-bar');

                var progressinnertext = progressinner.one('.visually-hidden');

                var progresscontainer = this.container.one('.dndupload-progressbars');

                progresscontainer.appendChild(progressouter);

                this.progressbars[filename] = {

                    progressouter: progressouter,

                    progressinner: progressinner,

                    progressinnertext: progressinnertext

                };

            }

        }

    };

    var dnduploader = function(options) {

        dnduploader.superclass.constructor.apply(this, arguments);

    };

    Y.extend(dnduploader, Y.Base, {

        // The URL to send the upload data to.

        api: M.cfg.wwwroot+'/repository/repository_ajax.php',

        // Options passed into the filemanager/filepicker element.

        options: {},

        // The function to call when all uploads complete.

        callback: null,

        // The function to call as the upload progresses

        callbackprogress: null,

        // The function to call if the upload is cancelled

        callbackcancel: null,

        // The list of files dropped onto the element.

        files: null,

        // The ID of the 'upload' repository.

        repositoryid: 0,

        // Array of files already in the current folder (to check for name clashes).

        currentfiles: null,

        // Total number of files already uploaded (to check for exceeding limits).

        currentfilecount: 0,

        // Number of new files will be upload in this dndupload (to check for exceeding limits).

        newFileCount: 0,

        // Total size of the files present in the area.

        currentareasize: 0,

        // The list of files to upload.

        uploadqueue: [],

        // This list of files with name clashes.

        renamequeue: [],

        // Size of the current queue.

        queuesize: 0,

        // Set to true if the user has clicked on 'overwrite all'.

        overwriteall: false,

        // Set to true if the user has clicked on 'rename all'.

        renameall: false,

        // The file manager helper.

        filemanagerhelper: null,

        // The function to call as the number of request upload.

        callbackNumberOfRequestUpload: null,

        // The function to call as the clear progresses.

        callbackClearProgress: null,

        // The function to call as the start progress.

        callbackStartProgress: null,

        /**

         * Initialise the settings for the dnduploader

         * @param object params - includes:

         *                     options (copied from the filepicker / filemanager)

         *                     repositoryid - ID of the upload repository

         *                     callback - the function to call when uploads are complete

         *                     currentfiles - the list of files already in the current folder in the filemanager

         *                     currentfilecount - the total files already in the filemanager

         *                     files - the list of files to upload

         * @return void

         */

        initializer: function(params) {

            this.options = params.options;

            this.repositoryid = params.repositoryid;

            this.callback = params.callback;

            this.callbackprogress = params.callbackprogress;

            this.callbackcancel = params.callbackcancel;

            this.currentfiles = params.currentfiles;

            this.currentfilecount = params.currentfilecount;

            this.currentareasize = 0;

            this.filemanagerhelper = this.options.filemanager;

            this.callbackNumberOfRequestUpload = params.callbackNumberOfRequestUpload;

            this.callbackClearProgress = params.callbackClearProgress;

            this.callbackStartProgress = params.callbackStartProgress;

            // Retrieve the current size of the area.

            for (var i = 0; i < this.currentfiles.length; i++) {

                this.currentareasize += this.currentfiles[i].size;

            };

            if (!this.initialise_queue(params.files)) {

                if (this.callbackcancel) {

                    this.callbackcancel();

                }

            }

        },

        /**

         * Entry point for starting the upload process (starts by processing any

         * renames needed)

         */

        start_upload: function() {

            this.process_renames(); // Automatically calls 'do_upload' once renames complete.

        },

        /**

         * Display a message in a popup

         * @param string msg - the message to display

         * @param string type - 'error' or 'info'

         */

        print_msg: function(msg, type) {

            var header = M.util.get_string('error', 'moodle');

            if (type != 'error') {

                type = 'info'; // one of only two types excepted

                header = M.util.get_string('info', 'moodle');

            }

            if (!this.msg_dlg) {

                this.msg_dlg_node = Y.Node.create(M.core_filepicker.templates.message);

                this.msg_dlg_node.generateID();

                this.msg_dlg = new M.core.dialogue({

                    bodyContent: this.msg_dlg_node,

                    centered: true,

                    modal: true,

                    visible: false

                });

                this.msg_dlg.plug(Y.Plugin.Drag,{handles:['#'+this.msg_dlg_node.get('id')+' .yui3-widget-hd']});

                this.msg_dlg_node.one('.fp-msg-butok').on('click', function(e) {

                    e.preventDefault();

                    this.msg_dlg.hide();

                }, this);

            }

            this.msg_dlg.set('headerContent', header);

            this.msg_dlg_node.removeClass('fp-msg-info').removeClass('fp-msg-error').addClass('fp-msg-'+type)

            this.msg_dlg_node.one('.fp-msg-text').setContent(msg);

            this.msg_dlg.show();

        },

        /**

         * Check the size of each file and add to either the uploadqueue or, if there

         * is a name clash, the renamequeue

         * @param FileList files - the files to upload

         * @return void

         */

        initialise_queue: function(files) {

            this.uploadqueue = [];

            this.renamequeue = [];

            this.queuesize = 0;

            // Loop through the files and find any name clashes with existing files.

            var i;

            for (i=0; i<files.length; i++) {

                if (this.options.maxbytes > 0 && files[i].size > this.options.maxbytes) {

                    // Check filesize before attempting to upload.

                    var maxbytesdisplay = this.display_size(this.options.maxbytes);

                    this.print_msg(M.util.get_string('maxbytesfile', 'error', {

                            file: files[i].name,

                            size: maxbytesdisplay

                        }), 'error');

                    this.uploadqueue = []; // No uploads if one file is too big.

                    return;

                }

                if (this.has_name_clash(files[i].name)) {

                    this.renamequeue.push(files[i]);

                } else {

                    if (!this.add_to_upload_queue(files[i], files[i].name, false)) {

                        return false;

                    }

                }

                this.queuesize += files[i].size;

            }

            return true;

        },

        /**

         * Generate the display for file size

         * @param int size The size to convert to human readable form

         * @return string

         */

        display_size: function(size) {

            // This is snippet of code (with some changes) is from the display_size function in moodlelib.

            var gb = M.util.get_string('sizegb', 'moodle'),

                mb = M.util.get_string('sizemb', 'moodle'),

                kb = M.util.get_string('sizekb', 'moodle'),

                b  = M.util.get_string('sizeb', 'moodle');

            if (size >= 1073741824) {

                size = Math.round(size / 1073741824 * 10) / 10 + gb;

            } else if (size >= 1048576) {

                size = Math.round(size / 1048576 * 10) / 10 + mb;

            } else if (size >= 1024) {

                size = Math.round(size / 1024 * 10) / 10 + kb;

            } else {

                size = parseInt(size, 10) + ' ' + b;

            }

            return size;

        },

        /**

         * Add a single file to the uploadqueue, whilst checking the maxfiles limit

         * @param File file - the file to add

         * @param string filename - the name to give the file on upload

         * @param bool overwrite - true to overwrite the existing file

         * @return bool true if added successfully

         */

        add_to_upload_queue: function(file, filename, overwrite) {

            if (!overwrite) {

                this.newFileCount++;

            }

            // The value for "unlimited files" is -1, so 0 should mean 0.

            if (this.options.maxfiles >= 0 && this.getTotalNumberOfFiles() > this.options.maxfiles) {

                // Too many files - abort entire upload.

                this.uploadqueue = [];

                this.renamequeue = [];

                this.print_msg(M.util.get_string('maxfilesreached', 'moodle', this.options.maxfiles), 'error');

                return false;

            }

            // The new file will cause the area to reach its limit, we cancel the upload of all files.

            // -1 is the value defined by FILE_AREA_MAX_BYTES_UNLIMITED.

            if (this.options.areamaxbytes > -1) {

                var sizereached = this.currentareasize + this.queuesize + file.size;

                if (sizereached > this.options.areamaxbytes) {

                    this.uploadqueue = [];

                    this.renamequeue = [];

                    this.print_msg(M.util.get_string('maxareabytesreached', 'moodle'), 'error');

                    return false;

                }

            }

            this.uploadqueue.push({file:file, filename:filename, overwrite:overwrite});

            return true;

        },

        /**

         * Get total number of files: Number of uploaded files, number of files unloading in other dndupload,

         * number of files need to be upload in this dndupload.

         * @return number Total number of files.

         */

        getTotalNumberOfFiles: function() {

            // Get number of files we added into other dndupload.

            let totalOfFiles = 0;

            if(this.callbackNumberOfRequestUpload) {

                totalOfFiles = this.callbackNumberOfRequestUpload.getTotal();

            }

            return this.currentfilecount + this.newFileCount + totalOfFiles;

        },

        /**

         * Take the next file from the renamequeue and ask the user what to do with

         * it. Called recursively until the queue is empty, then calls do_upload.

         * @return void

         */

        process_renames: function() {

            if (this.renamequeue.length == 0) {

                // All rename processing complete - start the actual upload.

                if(this.callbackNumberOfRequestUpload && this.uploadqueue.length > 0) {

                    this.callbackNumberOfRequestUpload.increaseTotal(this.newFileCount);

                }

                this.do_upload();

                return;

            }

            var multiplefiles = (this.renamequeue.length > 1);

            // Get the next file from the rename queue.

            var file = this.renamequeue.shift();

            // Generate a non-conflicting name for it.

            var newname = this.generate_unique_name(file.name);

            // If the user has clicked on overwrite/rename ALL then process

            // this file, as appropriate, then process the rest of the queue.

            if (this.overwriteall) {

                if (this.add_to_upload_queue(file, file.name, true)) {

                    this.process_renames();

                }

                return;

            }

            if (this.renameall) {

                if (this.add_to_upload_queue(file, newname, false)) {

                    this.process_renames();

                }

                return;

            }

            // Ask the user what to do with this file.

            var self = this;

            var process_dlg_node;

            if (multiplefiles) {

                process_dlg_node = Y.Node.create(M.core_filepicker.templates.processexistingfilemultiple);

            } else {

                process_dlg_node = Y.Node.create(M.core_filepicker.templates.processexistingfile);

            }

            var node = process_dlg_node;

            node.generateID();

            var process_dlg = new M.core.dialogue({

                bodyContent: node,

                headerContent: M.util.get_string('fileexistsdialogheader', 'repository'),

                centered: true,

                modal: true,

                visible: false

            });

            process_dlg.plug(Y.Plugin.Drag,{handles:['#'+node.get('id')+' .yui3-widget-hd']});

            // Overwrite original.

            node.one('.fp-dlg-butoverwrite').on('click', function(e) {

                e.preventDefault();

                process_dlg.hide();

                if (self.add_to_upload_queue(file, file.name, true)) {

                    self.process_renames();

                }

            }, this);

            // Rename uploaded file.

            node.one('.fp-dlg-butrename').on('click', function(e) {

                e.preventDefault();

                process_dlg.hide();

                if (self.add_to_upload_queue(file, newname, false)) {

                    self.process_renames();

                }

            }, this);

            // Cancel all uploads.

            node.one('.fp-dlg-butcancel').on('click', function(e) {

                e.preventDefault();

                process_dlg.hide();

                if (self.callbackcancel) {

                    this.notifyUploadCompleted();

                    self.callbackClearProgress();

                    self.callbackcancel();

                }

            }, this);

            // When we are at the file limit, only allow 'overwrite', not rename.

            if (this.getTotalNumberOfFiles() == this.options.maxfiles) {

                node.one('.fp-dlg-butrename').setStyle('display', 'none');

                if (multiplefiles) {

                    node.one('.fp-dlg-butrenameall').setStyle('display', 'none');

                }

            }

            // If there are more files still to go, offer the 'overwrite/rename all' options.

            if (multiplefiles) {

                // Overwrite all original files.

                node.one('.fp-dlg-butoverwriteall').on('click', function(e) {

                    e.preventDefault();

                    process_dlg.hide();

                    this.overwriteall = true;

                    if (self.add_to_upload_queue(file, file.name, true)) {

                        self.process_renames();

                    }

                }, this);

                // Rename all new files.

                node.one('.fp-dlg-butrenameall').on('click', function(e) {

                    e.preventDefault();

                    process_dlg.hide();

                    this.renameall = true;

                    if (self.add_to_upload_queue(file, newname, false)) {

                        self.process_renames();

                    }

                }, this);

            }

            node.one('.fp-dlg-text').setContent(M.util.get_string('fileexists', 'moodle', file.name));

            process_dlg_node.one('.fp-dlg-butrename').setContent(M.util.get_string('renameto', 'repository', newname));

            // Destroy the dialog once it has been hidden.

            process_dlg.after('visibleChange', function(e) {

                if (!process_dlg.get('visible')) {

                    if (self.callbackcancel) {

                        self.callbackcancel();

                    }

                    process_dlg.destroy(true);

                }

            }, this);

            process_dlg.show();

        },

        /**

         * Trigger upload completed event.

         */

        notifyUploadCompleted: function() {

            require(['core_form/events'], function(FormEvent) {

                const elementId = this.filemanagerhelper ? this.filemanagerhelper.filemanager.get('id') : this.options.containerid;

                FormEvent.triggerUploadCompleted(elementId);

            }.bind(this));

         },

        /**

         * Trigger form upload start events.

         */

        notifyUploadStarted: function() {

            require(['core_form/events'], function(FormEvent) {

                const elementId = this.filemanagerhelper ? this.filemanagerhelper.filemanager.get('id') : this.options.containerid;

                FormEvent.triggerUploadStarted(elementId);

            }.bind(this));

        },

        /**

         * Checks if there is already a file with the given name in the current folder

         * or in the list of already uploading files

         * @param string filename - the name to test

         * @return bool true if the name already exists

         */

        has_name_clash: function(filename) {

            // Check against the already uploaded files

            var i;

            for (i=0; i<this.currentfiles.length; i++) {

                if (filename == this.currentfiles[i].filename) {

                    return true;

                }

            }

            // Check against the uploading files that have already been processed

            for (i=0; i<this.uploadqueue.length; i++) {

                if (filename == this.uploadqueue[i].filename) {

                    return true;

                }

            }

            return false;

        },

        /**

         * Gets a unique file name

         *

         * @param string filename

         * @return string the unique filename generated

         */

        generate_unique_name: function(filename) {

            // Loop through increating numbers until a unique name is found.

            while (this.has_name_clash(filename)) {

                filename = increment_filename(filename);

            }

            return filename;

        },

        /**

         * Upload the next file from the uploadqueue - called recursively after each

         * upload is complete, then handles the callback to the filemanager/filepicker

         * @param lastresult - the last result from the server

         */

        do_upload: function(lastresult) {

            if (this.uploadqueue.length > 0) {

                var filedetails = this.uploadqueue.shift();

                this.upload_file(filedetails.file, filedetails.filename, filedetails.overwrite);

            } else {

                if (this.callbackNumberOfRequestUpload && !this.callbackNumberOfRequestUpload.get()) {