Patent ID: 8378976

Claim:
A control process implemented in a touchpad to perform scroll bar control thereby, the process comprising: detecting if a number of fingers touching on the touchpad is equal to or larger than a first threshold, for directly starting up a scroll bar control function which remains in operation independent of the movement of the fingers on the touchpad, until all fingers are removed from the touchpad; selectively switching between alternative cursor control and scroll bar control functions for the touchpad responsive to the detection independent of a sliding movement of said number of fingers; in the scroll bar control function, detecting the sliding movement of one or more fingers on the touchpad for scrolling on a window in accordance with the finger movement; simultaneously evaluating a vertical distance and a horizontal distance of the movement of the finger or fingers for scrolling a vertical scroll bar and a horizontal scroll bar on the window responsive to displacement of the finger or fingers on the touchpad, respectively; and continuing said scroll bar control function when at least one finger remains on said touchpad and said number of fingers remaining on said touchpad is larger than a second threshold; wherein said first threshold is larger than one and said second threshold.