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✏️ Editing: plugin.src.js

import IntegrationModel, { integrationModelProperties } from '@wiris/mathtype-html-integration-devkit/src/integrationmodel';
import Parser from '@wiris/mathtype-html-integration-devkit/src/parser';
import Util from '@wiris/mathtype-html-integration-devkit/src/util';
import Configuration from '@wiris/mathtype-html-integration-devkit/src/configuration';

import {version as pluginVersion} from './package.json';

/**
 * This property contains all Froala Integration instances.
 * @type {Object}
 */
export var instances = {};
/**
 * This property contains the current Froala integration instance,
 * which is the instance of the active editor.
 * @class
 * @type {IntegrationModel}
 */
export var currentInstance = null;

/**
 * This class represents the MathType integration from CKEditor4.
 * @extends {IntegrationModel}
 */

export class CKEditor4Integration extends IntegrationModel {
    /**
     *
     * @param {IntegrationModelProperties}
     */
    constructor(ckeditorIntegrationModelProperties) {
        /**
         * CKEditor4 Integration.
         *
         * @param {IntegrationModelProperties} integrationModelAttributes
         */
        super(ckeditorIntegrationModelProperties);
        /**
         * Folder name used for the integration inside CKEditor plugins folder.
         */
        this.integrationFolderName = 'ckeditor_wiris';
    }

/**@inheritdoc */
    init() {
        super.init();

const editor = this.editorObject;
        if ('wiriseditorparameters' in editor.config) {
            Configuration.update('editorParameters', editor.config.wiriseditorparameters);
        }
    }

/**
	 * When no language is set, ckeditor sets the toolbar to user's browser language.
     * @inheritdoc
     * @returns {String} - The CKEditor instance language.
     * @override
     */
    getLanguage() {
        // Returns the CKEDitor instance language.
        return this.editorObject.langCode;
    }

/**
     * @override
     */
    getPath() {
        // Delegates the responsability to get the path to CKEditor.
        return this.editorObject.plugins.ckeditor_wiris.path;
    }

/**
     * Adds callbacks to the following CKEditor listeners:
     * - 'focus' - updates the current instance.
     * - 'contentDom' - adds 'doubleclick' callback.
     * - 'doubleclick' - sets to null data.dialog property to avoid modifications for MathType formulas.
     * - 'setData' - parses the data converting MathML into images.
     * - 'afterSetData' - adds an observer to MathType formulas to avoid modifications.
     * - 'getData' - parses the data converting images into selected save mode (MathML by default).
     * - 'mode' - recalculates the active element.
     */
    addEditorListeners() {
        const editor = this.editorObject;

if (typeof editor.config.wirislistenersdisabled == 'undefined' ||
            !editor.config.wirislistenersdisabled) {

// First editor parsing.
            editor.setData(Parser.initParse(editor.getData()));

// Maintain currentInstance updated.
            editor.on('focus', function (event) {
                WirisPlugin.currentInstance = WirisPlugin.instances[event.editor.name];
            });

editor.on('contentDom', function () {

editor.on('doubleclick', function (event) {

if (event.data.element.$.nodeName.toLowerCase() == 'img' &&
                        Util.containsClass(event.data.element.$, Configuration.get('imageClassName')) ||
                        Util.containsClass(event.data.element.$, Configuration.get('CASClassName'))) {

event.data.dialog = null;
                    }

}.bind(this));

this.addEvents();

}.bind(this));

editor.on('setData', function (e) {

e.data.dataValue = Parser.initParse(e.data.dataValue || "");

}.bind(this));

editor.on('afterSetData', function (e) {

if (typeof Parser.observer !== 'undefined') {
                    Array.prototype.forEach.call(document.getElementsByClassName('Wirisformula'), function (wirisImages) {

Parser.observer.observe(wirisImages);

});
                }

}.bind(this));

editor.on('getData', function (e) {

e.data.dataValue = Parser.endParse(e.data.dataValue || "");

}.bind(this));

// When CKEditors changes from WYSIWYG to source element, recalculate 'element' variable is mandatory.
            editor.on('mode', function (e) {

this.checkElement();

}.bind(this));

this.checkElement();
        }
        else {
            // CKEditor replaces several times the element element during its execution, so we must assign the events again.
            // We need to set a callback function to set 'element' variable inside CKEDITOR.plugins.add scope.
            editor.on('instanceReady', function (params) {

this.checkElement();

}.bind(this));

editor.resetDirty();
        }
    }

/**
     * Checks the current container and assign events in case that it doesn't have them.
     * CKEditor replaces several times the element element during its execution,
     * so we must assign the events again to editor element.
     */
    checkElement() {
        const editor = this.editorObject;
        const elem = document.getElementById('cke_contents_' + editor.name) ?
            document.getElementById('cke_contents_' + editor.name) :
            document.getElementById('cke_' + editor.name);

let newElement;
        if (editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE) {
            newElement = editor.container.$;
        } else {
            newElement = elem.getElementsByTagName('iframe')[0];
        }

// If the element wasn't treated, add the events.
        if (!newElement.wirisActive) {
            if (editor.elementMode === CKEDITOR.ELEMENT_MODE_INLINE) {
                if (newElement.tagName === 'TEXTAREA') {
                    // Inline editor from a textarea element. In this case the textarea will be replaced by a div element with inline editing enabled.
                    const eventElements = document.getElementsByClassName('cke_textarea_inline');
                    Array.prototype.forEach.call(eventElements, function (entry) {

this.setTarget(entry);
                        this.addEvents();

});
                }
                else {
                    this.setTarget(newElement);
                    this.addEvents();
                }
                // Set the element as treated.
                newElement.wirisActive = true;
            }
            else if (!!newElement.contentWindow || _wrs_int_divIframe) {
                this.setTarget(newElement);
                this.addEvents();
                // Set the element as treated.
                newElement.wirisActive = true;
            }
        }
    }

/**
     * @inheritdoc
     * @param {HTMLElement} element - HTMLElement target.
     * @param {MouseEvent} event - Event which trigger the handler.
     */
    doubleClickHandler(element, event) {
        if (element.nodeName.toLowerCase() == 'img') {
            if (Util.containsClass(element, Configuration.get('imageClassName'))) {
                // Some plugins (image2, image) open a dialog on double click. On formulas
                // doubleclick event ends here.
                if (typeof event.stopPropagation != 'undefined') { // old I.E compatibility.
                    event.stopPropagation();
                } else {
                    event.returnValue = false;
                }
                this.core.getCustomEditors().disable();
                const customEditorAttr = element.getAttribute(Configuration.get('imageCustomEditorName'));
                if (customEditorAttr) {
                    this.core.getCustomEditors().enable(customEditorAttr);
                }
                this.core.editionProperties.temporalImage = element;
                this.openExistingFormulaEditor();
            }
        }
    }

/** @inheritdoc */ 
    insertFormula(focusElement, windowTarget, mathml, wirisProperties) {
        // Due to insertFormula adds an image using pure JavaScript functions,
        // it is needed notificate to the editorObject that placeholder status
        // has to be updated.
        const formula = super.insertFormula(focusElement, windowTarget, mathml, wirisProperties);
        this.editorObject.fire('change');
        return formula;
    }

/** @inheritdoc */
    getCorePath() {
        return CKEDITOR.plugins.getPath(this.integrationFolderName);
    }

/** @inheritdoc */
    getSelection() {
        this.editorObject.editable().$.focus();
        return this.editorObject.getSelection().getNative();
    }

/** @inheritdoc */
    callbackFunction() {
        super.callbackFunction();
        this.addEditorListeners();
    }
}

(function () {

CKEDITOR.plugins.add('ckeditor_wiris', {
        'init': function (editor) {
            editor.ui.addButton('ckeditor_wiris_formulaEditor', {

'label': 'Insert a math equation - MathType',
                'command': 'ckeditor_wiris_openFormulaEditor',
                'icon': CKEDITOR.plugins.getPath('ckeditor_wiris') + './icons/' + 'formula.png'

});

editor.ui.addButton('ckeditor_wiris_formulaEditorChemistry', {

'label': 'Insert a chemistry formula - ChemType',
                'command': 'ckeditor_wiris_openFormulaEditorChemistry',
                'icon': CKEDITOR.plugins.getPath('ckeditor_wiris') + './icons/' + 'chem.png'

});

// Is needed specify that our images are allowed.
            let allowedContent = 'img[align,';
            allowedContent += Configuration.get('imageMathmlAttribute');
            allowedContent += ',src,alt](!Wirisformula)';

// MathType Editor.
            editor.addCommand('ckeditor_wiris_openFormulaEditor', {

'async': false,
                'canUndo': true,
                'editorFocus': true,
                'allowedContent': allowedContent,
                'requiredContent': allowedContent,

'exec': (editor) => {
                    const ckeditorIntegrationInstance = WirisPlugin.instances[editor.name];
                    // Can be that previously custom editor was used. So is needed disable
                    // all the editors to avoid wrong behaviours.
                    ckeditorIntegrationInstance.core.getCustomEditors().disable();
                    ckeditorIntegrationInstance.openNewFormulaEditor();
                }

});

// ChemType.
            editor.addCommand('ckeditor_wiris_openFormulaEditorChemistry', {

'async': false,
                'canUndo': true,
                'editorFocus': true,
                'allowedContent': allowedContent,
                'requiredContent': allowedContent,

'exec': (editor) => {
                    const ckeditorIntegrationInstance = WirisPlugin.instances[editor.name];
                    ckeditorIntegrationInstance.core.getCustomEditors().enable('chemistry');
                    ckeditorIntegrationInstance.openNewFormulaEditor();
                }

});

editor.on('instanceReady', function () {

/**
                 * Integration model constructor attributes.
                 * @type {integrationModelProperties}
                 */
                let ckeditorIntegrationModelProperties = {};
                ckeditorIntegrationModelProperties.editorObject = editor;
                // In CKEditor always there is an iframe or a div container. To access, we use the property that
                // the container has a class 'cke_wysiwyg_[container type]' where [container type] can be 'frame' or 'div'.
                ckeditorIntegrationModelProperties.target = editor.container.$.querySelector('*[class^=cke_wysiwyg]');
                ckeditorIntegrationModelProperties.serviceProviderProperties = {};
                ckeditorIntegrationModelProperties.serviceProviderProperties.URI = 'integration';
                ckeditorIntegrationModelProperties.serviceProviderProperties.server = 'php';
                ckeditorIntegrationModelProperties.version = pluginVersion;
                ckeditorIntegrationModelProperties.scriptName = "plugin.js";
                ckeditorIntegrationModelProperties.environment = {};
                ckeditorIntegrationModelProperties.environment.editor = "CKEditor4";
                ckeditorIntegrationModelProperties.environment.editorVersion = "4" + '.x';
                // Updating integration paths if context path is overwritten by editor javascript configuration.
                if ('wiriscontextpath' in editor.config) {
                    ckeditorIntegrationModelProperties.configurationService  = editor.config.wiriscontextpath + ckeditorIntegrationModelProperties.configurationService;
                    console.warn('Deprecated property wiriscontextpath. Use mathTypeParameters on instead.', editor.config.wiriscontextpath);
                }

// Overriding MathType integration parameters.
                if ('mathTypeParameters' in editor.config) {
                    ckeditorIntegrationModelProperties.integrationParameters = editor.config.mathTypeParameters;
                }

const ckeditorIntegrationInstance = new CKEditor4Integration(ckeditorIntegrationModelProperties);
                ckeditorIntegrationInstance.init();
                ckeditorIntegrationInstance.listeners.fire('onTargetReady', {});
                WirisPlugin.instances[editor.name] = ckeditorIntegrationInstance;
                WirisPlugin.currentInstance = ckeditorIntegrationInstance;
            });
        }
    });

})();

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