public void setJustifyContent(@JustifyContent int justifyContent) {
        if (mJustifyContent != justifyContent) {
            mJustifyContent = justifyContent;
            requestLayout();
        }
    }
Sub method for {@link #onDraw(Canvas)} when the main axis direction is vertical
({@link #mFlexDirection} is either of {@link #FLEX_DIRECTION_COLUMN} or
{@link #FLEX_DIRECTION_COLUMN_REVERSE}.

@param canvas          the canvas on which the background will be drawn
@param isRtl           {@code true} when the horizontal layout direction is right to left,
                       {@code false} otherwise
@param fromBottomToTop {@code true} when the vertical layout direction is bottom to top,
                       {@code false} otherwise
common/src/main/java/com/sxjs/common/widget/flexboxlayout/FlexboxLayout.java