| 摘要 |
A user interface displays categories in one direction, such as horizontally. It displays subcategories in another direction, such as vertically. A category is selected by scrolling in the first direction and then the subcategory is selected by scrolling in the second direction. A control unit with a rotatable actuator, such as a scroll wheel or track ball is used to scroll the display. When the control unit is held in one orientation, the display scrolls in the first direction in response to the actuator being rotated. When the control unit is held in another orientation, the display scrolls in the second direction. The orientation of the control unit may match the direction that the display scrolls. The current category or subcategory maybe selected when the orientation of the control unit changes. Alternatively, a separate actuator, may be used to select the category or subcategory.
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