Method layoutCallback

extensions/amp-mathml/0.1/amp-mathml.js:54–78

* Adds a layout callback for mathml iframe. * * @return {!Promise}

()

   * @return {!Promise}
   */
  layoutCallback() {
    const iframe = getIframe(this.win, this.element, 'mathml');
    iframe.title = this.element.title || 'MathML formula';
    applyFillContent(iframe);
    // Triggered by context.updateDimensions() inside the iframe.
    listenFor(
      iframe,
      'embed-size',
      (data) => {
        if (!this.element.hasAttribute('inline')) {
          // Don't change the width if not inlined.
          data['width'] = undefined;
        }
        Services.mutatorForDoc(this.getAmpDoc()).forceChangeSize(
          this.element,
          data['height'],
          data['width']
        );
      },
      /* opt_is3P */ true
    );
    this.element.appendChild(iframe);
    this.iframe_ = iframe;
    return this.loadPromise(iframe);
  }

  /**
   * Removes mathml iframe.