How to get scroll bar real width in Qt?

Question

I'm trying to make a custom widget, which is basically a bunch of textedits with a single vertical scroll bar on the right. To keep widget size determined, I have to find a width of the scrollbar, as texedits geometry depends on it. Simply calling scroll_bar->width(); for freshly created vertical bar returns 101, which is obviuosly wrong.

So, is there a way to determine vertical scroll bar width correctly in Qt 3.2.3?

score 28 · Accepted Answer · answered May 13 '13 at 07:00

28

int w = qApp->style()->pixelMetric(QStyle::PM_ScrollBarExtent);

answered May 13 '13 at 07:00

hank

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The size of the top and bottom buttons have also this height. – Adrian Maire Jun 22 '15 at 08:19
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Seems to be three pixels short for me, for whatever strange reason... :( – mjwach May 04 '16 at 10:46
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It does seem to be 3 pixels small in Qt5 under windows. – drescherjm Oct 15 '20 at 23:36

score 1 · Answer 2 · answered May 13 '13 at 07:39

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I've also found

vsb->sliderRect().width();

which happens to be correct, but it looks bad in the code, as I have no interest in slider per se.

answered May 13 '13 at 07:39

akalenuk

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What is `sliderRect()`? It is not a member of QScrollBar. – VP. Apr 11 '16 at 13:13
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This relays to outdated Qt 3.2.3. It has been changes since 4.0. – akalenuk Apr 12 '16 at 05:49
Oh, yes, I missed that. – VP. Apr 12 '16 at 09:36

score 0 · Answer 3 · answered Aug 20 '23 at 06:53

If you're using a scrollArea and getting the scrollbar's width a few pixels short when using Hank's answer, try the following:

int scrollBarWidth = qApp->style()->pixelMetric(QStyle::PM_ScrollBarExtent);
scrollBarWidth += ui->scrollArea->width() - ui->scrollAreaWidgetContents->width();

It seems that there's a small difference in size between the scrollArea and the scrollAreaWidgetContents.

How to get scroll bar real width in Qt?

3 Answers3

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