author: IUnScrollController is the common interface to all widgets which includeauthor: scroll functionality which can be controlled by the userauthor:
Gets the current position of the horizontal scrollbar
position
Gets the current position of the vertical scrollbar
Sets the absolute position of the horizontal scrollbar
Parameters: xPx - offset to add
Adds an offset in x direction to the current position of the horizontal scrollbar
Sets the absolute position of the vertical scrollbar
Parameters: xPy - offset to add
Adds an offset in y direction to the current position of the vertical scrollbar