RAD Studio VCL Reference
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TTrackBar.PageSize Property

Specifies the amount Position is changed when the PageUp or PageDown key is pressed, or when the bar is clicked.

Pascal
property PageSize: Integer;
C++
__property int PageSize;

Set PageSize to the distance along the track bar that corresponds to a single view. A slider marks the current Position. The Page Up key increments the value of Position by PageSize, and Page Down key decrements the value of Position by PageSize.  

Use the LineSize property to set the number of ticks moved using the arrow keys. 

 

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