Returns the relative offset for the upper (leftmost) and lower (rightmost) end of the scrollbar slider. Offset 0.0 means that the slider is in its topmost (or leftmost) position, and offset 1.0 means that it is in its bottommost (or rightmost) position.
Moves the slider to a new position.
Returns a floating point number that should be added to the current slider offsets in order to move the slider the given number of pixels. This is typically used by the mouse bindings to figure out how to move the slider when the user is dragging it around.
Returns a floating point value which gives the offset corresponding to the given mouse position.
Returns a string describing what's under the mouse pointer. This is typically one of "arrow1" (top/left arrow), "trough1", "slider", "trough2" or "arrow2" (bottom/right).