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Sometimes you need to know the width (or height) of a scrollbar used in a control like a Grid (for example a TStringGrid, a TDBGrid, etc).
Especially cross platform and with the use of themes, different OS versions, etc. this can be a challenge since this is not a fixed value.
This is how you can determine these values (should work for Windows, MacOS, Linux/GTK, QT):
uses
LCLIntf, LCLType;
var
h, w: Integer;
...
h := GetSystemMetrics(SM_CYHSCROLL); // scrollbar height
w := GetSystemMetrics(SM_CXVSCROLL); // scrollbar width
