private boolean isMainAxisDirectionHorizontal(@FlexDirection int flexDirection) {
        return flexDirection == FLEX_DIRECTION_ROW
                || flexDirection == FLEX_DIRECTION_ROW_REVERSE;
    }
Retrieve the sum of the cross sizes of all flex lines including divider lengths.

@return the sum of the cross sizes
common/src/main/java/com/sxjs/common/widget/flexboxlayout/FlexboxLayout.java