RAD Studio VCL Reference
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TMouse.WheelScrollLines Property

Specifies the number of lines that are scrolled for each notch that the mouse wheel is rotated.

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

Use WheelScrollLines to get the number of lines that are scrolled for each notch that the mouse wheel is rotated. 

WheelScrollLines can be set under Mouse in the Windows Control Panel. 

 

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