# Class Hook
Class hook means vuescroll will add the corresponding class name when a particular event occurs.
require 4.12.0-rc+
# hasVBar
When the vertical scrollbar exists.
# hasHBar
When horizontal scrollbars exist.
# vBarVisible
When the vertical scrollbar is visible.
# hBarVisible
When the horizontal scrollbar is visible.
# vBarDragging
When the vertical scrollbar is dragged
# hBarDragging
When the horizontal scrollbar is dragged
# clikingVerticalStartButton
When the scroll button on the vertical scrollbar is clicked.
# clikingVerticalEndButton
When the scroll button under the vertical scrollbar is clicked.
# clikingHorizontalStartButton
When the scroll button under the vertical scrollbar is clicked.
# clikingHorizontalEndButton
When the scroll button on the right side of the vertical horizontal scrollbar is clicked.
# mouseEnter
When the mouse enters vuescroll.
