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The track is the area in the scrollbar assigned to a particular tracker system, either the finetracker system or the coarsetracker system. After the scrollbar allocates the corresponding areas for the two arrows, the remaining area is assigned to the tracks. This area is divided into two parallel to or along the orientation of the scrollbar. This division produces the length of the track. The area, which will be finally assigned to a track system, will depend upon the setting of the FineTrackerNear. See FineTrackerNear for more information.
The functionality of the track is tied up with the ticks drawn on it.
Ticks are a series of markers spread along the length of the track. The rectangular area demarcated by two consecutive ticks, the higher tick included, forms one track division or the tick division of the upper tick. In the coarsetrack, the number of track divisions represents the total full-page groupings, plus 1 if there is a last grouping which is less than the extent. The pages here maybe scanned using the finetracker and lower extents, or the arrows. In the finetrack the track division is 1 + DynRadix, the number used for grouping the pages, so the members in a group or extent maybe fully scanned. Each tick division represents movement equal to the extent of the tracker.
The track divisions are of equal size except possibly for one track division. This determines what type the track is. For best results use minimum interval size less than or equal to the suggested trackersize.
The lowest track division of the track representing the first group always has a length equal to the corresponding length of the tracker. The rest equally divides the remaining track area. It represents the initial area of the tracker, thus the name park. When the tracker has a length larger than the track divisions, it hides the other track divisions wherever it is not in its parking area, so no track operations may be done in those areas.
The track division of the track representing the current position of the tracker has a length equal to the corresponding length of the tracker. The rest equally divides the remaining track area. The effect of this is that the tracker seemingly splits the track so that the whole set of track divisions where the track could move is visible all the time, thus the name split.
4/13/2006, 1:16:00 PM
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