Qt Designer, layouts with setSpacing(0()); why?

[Tink]

Hi, i don't understand why designer generates these statements for many layouts:
verticalLayout->setSpacing(0());
verticalLayout->setMargin(0());

I'm now trying Qt Creator for the first time and i get this:
error: expression cannot be used as a function

I changed the margins and spacings in designer but it only shows the specific fields (like horizontal and vertical).
Any suggestions?

[mrjj]

Hi
That i have never seen before.
What Qt version ?
What Creator version ?
What platform. linux/win/mac

How exactly did you do to get this ?

First you use standalone designer and then later in
open the UI file in Creator?

Please tell step, by step.

[Tink]

@mrjj

Arch-Linux, Qt 5.13
I'm using a UI that was created in Designer which i used before with PyQt. From within designer i can already see this weird setSpacing(0()) by using the menu: Form -> View Code... So far i haven't been able to recreate this behavior in a new UI.

[mrjj]

@tink
maybe the file was damaged or something like that.

[Tink]

@mrjj
I have no indication of such a problem. I can open, save as, copy etc.

Whatever goes wrong manifests in the stage of compiling the Qt User Interface.

[mrjj]

@tink
But if you make new UI , such code is not generated?
I assume its the pythons version of uic you are using ?
Did you look in the UI file if anything that look odd ?

[Tink]

@mrjj
So far i haven't seen this code being generated in a new UI.

I have uic and pyuic. If i generate a python version the code is normal.
self.gridLayout_1.setSpacing(0)
But if i use uic then i get this:
gridLayout_1->setSpacing(0());

I looked at the UI file and didn't see strange things. Though it's a lot of lines (3k+) and have not checked them all.

[mrjj]

@tink
ok so its only with c++ code gen, something odd happens.
Any chance we can have the UI file to play with ?

[Tink]

@mrjj
Thanks for trying to help me fix this but i'm not comfortable with sharing the UI file. Hope you understand.

I will try to find the problem by eliminating code step by step. If i find something i will post the result.

[mrjj]

@tink
Yes, i understand.
Its not always an option to share.

Please update if you find something.

[Tink]

@mrjj

OK here is what i found:

<layoutdefault spacing="0" margin="0"/>
<layoutfunction spacing="0" margin="0"/>

After removing these 2 lines all the errors are gone.

I have no idea why those lines were generated. They were near the bottom of the file and not inside other tags.
Would be nice to know what caused this.

[Tink]

Found out where they come from. Designer menu: form settings.

edit:
I had the layout function enabled and both fields set to zero. Instead of giving it a function name. Of course i don't even need (or understand) this functionality and should have left it alone. But this was many months ago when i first started with Qt. So today i found out i must think more before i click on something that seems harmless ;)