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How can I hide the focus around a VCL TTrackBar when selected/while tracking, while using a VCL style? Using Delphi 11.1

This didn't work:

SendMessage(tb1.Handle, WM_UPDATEUISTATE, UIS_SET OR UISF_HIDEFOCUS, 0);

enter image description here

hikari
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  • [Documentation](https://learn.microsoft.com/en-us/windows/win32/menurc/wm-updateuistate) reveals `UIS_SET` means "The UI state element specified by the high-order word should be visible." Exactly the opposite of what you want. Use `UIS_CLEAR` instead. – Tom Brunberg Apr 07 '22 at 14:07
  • However, I believe the focus change, when pointing with mouse, overrules that setting anyway – Tom Brunberg Apr 07 '22 at 14:27
  • Yes, no difference with UIS_CLEAR – hikari Apr 07 '22 at 15:27

2 Answers2

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Using

SendMessage(tb1.Handle, WM_UPDATEUISTATE, UIS_CLEAR OR UISF_HIDEFOCUS, 0);

does work.

Before

enter image description here

After

enter image description here

Although it is definitely the case that calling:

SendMessage(tb1.Handle, WM_UPDATEUISTATE, UIS_CLEAR OR UISF_HIDEFOCUS, 0);

while the control has focus causes the focus rectangle to temporarily re-appear until it loses focus.

Note: I only tried it with styles enabled.

Ian Boyd
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You can prevent TTrackBar from getting focused by setting its TabStop property to ˙False`.

When you do this the the dotted line around TTrackBar won't ever be shown.

Well the only exception is if you have no other focusable component on the form in which case the dotted line still appears when you start interacting with the trackbar.

EDIT: Right I forgot that VCL Styles override the said property amongst many others.

You could modify your VCL style in a way so you disable the FocusEffect for TTrackBar and then use this modified style instead.

SilverWarior
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