How to size QComboBox popup height to the count of items

[davecotter]

Re: Dynamically fit QComboBox popup height to the (dynamically changing) count of items

is there no definitive answer to this? my "dropdown" always has a scroll bar when it doesn't need to:

How do i tell it to resize just enough such that there's no scroll bar?

[davecotter]

@vmanso said in How to size QComboBox popup height to the count of items:

maxVisibleItems

that was it! thanks so much!

[jsulm]

@davecotter said in How to size QComboBox popup height to the count of items:

my "dropdown" always has a scroll bar when it doesn't need to

Do you mean there is nothing below "kJams 2 (Upgrade from Lite)" to scroll to?

[davecotter]

no i mean there are a few more items, and there's no reason not to just show them by making the little "window" bigger, without needing a scroll bar

[JonB]

@davecotter
I happened to look at sizing of QComboBox dropdown just a few days ago (https://forum.qt.io/topic/105012/qcombobox-specify-width-less-than-content, I'm just going to put some code in there). It turns out it is QComboBox::view() is what you need to fiddle with to adjust dropdown size. I was using QComboBox::view()::setMinimumWidth() for width, you will presumably want something with QComboBox::view()::setMinimumHeight(), or something which sets its size policy to fit instead of scroll if that is available (QSizePolicy??).

[vmanso]

The function you are looking for is "maxVisibleItems". Use it to change the number of visible items in the combo box to the total number of items you have.

[SGaist]

@vmanso said in How to size QComboBox popup height to the count of items:

maxVisibleItems

Beware, the documentation of the function warns about some caveats to take into account for non-editable combo boxes on some platforms.

[davecotter]

@vmanso said in How to size QComboBox popup height to the count of items:

maxVisibleItems

that was it! thanks so much!