@Px
  public int getMaxWidth() {
    return mMaxWidthMode == PIXELS ? mMaxWidth : -1;
  }
Returns the max width expressed in pixels.

@return the max width expressed in pixels or -1, if the max width was set in ems instead
@see #setMaxWidth(int)
library/src/main/java/com/facebook/fbui/textlayoutbuilder/TextLayoutBuilder.java