Scrollable Element

This is an interface for elements that are scrollable.

Interface methods:

• getScroll: Gets the scroll position.
• setScroll: Sets the scroll postiion.
• scroll: Scrolls the element.
• getSmoothScroll: Gets the smoothened scroll position.
• getMaxScroll: Gets the maximum scroll postiion.
• getScrollerWidth: Gets the scroller width.
• getContentHeight: Gets the content’s height.
• isOverflowing: Returns true if the contents are overflowing.