| 摘要 |
<p>PROBLEM TO BE SOLVED: To make it possible, by a simple and intuitive operation, to arbitrarily select from a plurality of scroll modes and to use the selected scroll mode. SOLUTION: A track bar 15 is provided with a roller part that a user rotates and also a rotary encoder that detects the rotation of the roller part by one unit angle. A rotational speed calculating means 20a, when the track bar 15 is operated, calculates the rotational speed of the body of revolution on the basis of the output of the rotary encoder and the timer value of a timer 19. A scroll mode selecting means 20b, depending on which of 'low speed' range and 'high speed' does the calculated rotational speed fall into, sets the scroll mode to be either of line scroll mode and page scroll mode. Then, a scroll processing means 20c executes a screen scroll by the scroll amount responsive to the scroll mode selected responsive to the rotation by one unit angle of the roller part.</p> |
