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Lazarus Pascal - How to determine Scrollbar width or height


 Hans
(@hans)
Noble Member Admin
Joined: 8 years ago
Posts: 1758
Topic starter  

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

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