excel-builder/src/Excel/Drawings.js

An easy way of building Excel files with javascript

/**
 * @module Excel/Drawings
 */

"use strict";
var _ = require('lodash');
var util = require('./util');
var RelationshipManager = require('./RelationshipManager');

var Drawings = function () {
    this.drawings = [];
    this.relations = new RelationshipManager();
    this.id = _.uniqueId('Drawings');
};

_.extend(Drawings.prototype, {
    /**
     * Adds a drawing (more likely a subclass of a Drawing) to the 'Drawings' for a particular worksheet.
     *
     * @param {Drawing} drawing
     * @returns {undefined}
     */
    addDrawing: function (drawing) {
        this.drawings.push(drawing);
    },
    getCount: function () {
        return this.drawings.length;
    },
    toXML: function () {
        var doc = util.createXmlDoc(util.schemas.spreadsheetDrawing, 'xdr:wsDr');
        var drawings = doc.documentElement;
        drawings.setAttribute('xmlns:a', util.schemas.drawing);
        drawings.setAttribute('xmlns:r', util.schemas.relationships);
        drawings.setAttribute('xmlns:xdr', util.schemas.spreadsheetDrawing);

        for(var i = 0, l = this.drawings.length; i < l; i++) {

            var rId = this.relations.getRelationshipId(this.drawings[i].getMediaData());
            if(!rId) {
                rId = this.relations.addRelation(this.drawings[i].getMediaData(), this.drawings[i].getMediaType()); //chart
            }
            this.drawings[i].setRelationshipId(rId);
            drawings.appendChild(this.drawings[i].toXML(doc));
        }
        return doc;
    }
});

module.exports = Drawings;