Controlling Scroll Amounts

A scroll bar has two other important attributes: its line magnitude and page magnitude.

The line magnitude, initialized to 1, is the distance, in range units, the thumb moves when the user clicks the scroll bar's arrows. The page magnitude, initialized to 10, is the distance, also in range units, the thumb moves when the user clicks the scrolling area. You can change these values by changing the TScrollBar data members LineMagnitude and PageMagnitude.