RAD Studio VCL Reference
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TTrackBar.LineSize Property

Indicates the amount the value of Position changes when the user presses the arrow keys.

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

Use LineSize to specify the distance along the slider that represents a single unit. The current Position is marked by a slider. The right and down arrow keys increment the value of Position by LineSize, and the left and up arrow keys decrement the value of Position by LineSize. 

Use the PageSize property to set the number of ticks moved using the Page Up and Page Down keys. 

 

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