public TextLayoutBuilder setMaxEms(int maxEms) {
    mMaxWidth = maxEms;
    mMaxWidthMode = EMS;
    return this;
  }
Sets the max width expressed in ems.

@param maxEms max width expressed in ems
@return This {@link TextLayoutBuilder} instance
@see #setMaxWidth(int)
@see #setMinEms(int)
library/src/main/java/com/facebook/fbui/textlayoutbuilder/TextLayoutBuilder.java