# All files / src/lib DivElement.js

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     const lengthOf = (style, element) => {
        return parseInt(window.getComputedStyle(element, null)[style], 0);
    };

    export class Size {
        constructor(lengthOfFunction = null) {
            this.lengthOf = lengthOfFunction ? lengthOfFunction : lengthOf;
            this.element = null;
            this.content = null;
        }

        _getSizeOf(element) {
            const lengthOf = (style) => this.lengthOf(style, element);
            return {
                width: element.offsetWidth + lengthOf('marginLeft') + lengthOf('marginRight'),
                height: element.offsetHeight + lengthOf('marginTop') + lengthOf('marginBottom'),
            };
        }

        ofDivWith(item, classes) {
            if (!this.element) {
                this._createElementWhenBodyExists();
            }
            this.element.setAttribute('class', classes);
            this.content.nodeValue = item.label;

            return this._getSizeOf(this.element);
        }

        _createElementWhenBodyExists() {
            const { element, content } = this._createHiddenElement();
            this.element = element;
            this.content = content;
        }

        _createHiddenElement() {
            const element = document.createElement('div');
            const content = document.createTextNode('');
            element.appendChild(content);
            element.style.left = "-1000px";
            element.style.position = 'absolute';
            document.body.appendChild(element);

            return { element, content };
        }
    }

    export const size = new Size();