QSplitter::handle:pressed not working on external stylesheet

[Robert Sanson]

I am trying to change the background color when the user clicks and drags a QSplitter to adjust the size of a panel.
This style is in an external qss style sheet:

QSplitter::handle:pressed {
    background: rgb(0, 176, 240);
    border: 2px solid rgb(0, 112, 192);
}

This doesn't seem to work, nor has any variation that I have tried.

[mrjj]

Hi and welcome to the forums

I fast tried your style and it seems to work on Windows.

What platform are you on ?

[Robert Sanson]

I'm on a VirtualBox RHEL 7 VM

[mrjj]

@Robert-Sanson
So on Red hat 7, no effect is seen on the splitter?

I assume it already uses fusion but depending on Qt version, could also be the gtk plugin.

Could you try
qApp->setStyle(QStyleFactory::create("Fusion"));
in main.cpp ?

and see if that changes anything,

It can be that on linux, the QStyle used, does not support styling for that element.

[Robert Sanson]

@mrjj said in QSplitter::handle:pressed not working on external stylesheet:

qApp->setStyle(QStyleFactory::create("Fusion"));

I just tried that but it didn't make a difference. What is weird is that my other QSplitter styles seem to work, just not the ::handle:pressed one.

QSplitter {
    margin: 0;
    padding: 0;
    min-height: 6px;
    border: 1px solid rgb(210, 215, 211);
}

QSplitter:hover {
    margin: 0;
    padding: 0;
    min-height: 6px;
    border: 2px solid rgb(0, 176, 240);
}

QSplitter::handle:pressed {
    background-color: rgb(0, 176, 240);
    border: 2px solid rgb(0, 112, 192);
}

[mrjj]

Hi
I just tried in a Linux Mint and it also would color it when pressed.
What Qt are you using ?
Could be a bug in that version and RHEL 7.

[Robert Sanson]

@mrjj RHEL version is 7.7 and Qt version is 5.14.1

[mrjj]

@Robert-Sanson
Ok so not due being old version :)
I tried and older ubuntu and a mint and both worked.
But its using XFCE4

REL 7 is using gnome or ?
sorry for my blondness but mostly used debian based linuxes. :)

Would you say CentOS 7.7 would be the same ? ( to test on )

[Robert Sanson]

@mrjj Yea, I'm not sure. From searching it looks like CentOS would be similar.

[mrjj]

@Robert-Sanson
yeah i also read it as very close to RHEL, at least from a system perspective.

Btw could you try to tell me what

qDebug() << QApplication::style()->metaObject()->className();
(in main.cpp after QApplication is created)
says ?

[Robert Sanson]

@mrjj said in QSplitter::handle:pressed not working on external stylesheet:

qDebug() << QApplication::style()->metaObject()->className();

Looks like it says QFusionStyle (without the previous code for setting it to that).

[mrjj]

@Robert-Sanson
Ok that very odd then
as same style on the Mint Linux where it does color it.

So can we talk about
"external stylesheet"

in what way extern ?
im just setting it on the splitter with right click.

Did you try in clean project ?
Just new default GUI project and place 2 buttons on MainWindow, then select both and right click and layout menu and apply splitter
then right click splitter (in widget tree to teh right) and Change stylesheet.

[mrjj]

Hi
Installed a CentOs and Qt but seems the gcc i get is 4.8.5
and i cant run anything. ( no c++ 11 it seems)
So didnt really found out more.

Update.
I compiled a new GCC (7.3) and made it run.

Oddly enough your stylesheet does work. !

[Robert Sanson]

I'm guessing it has something to do with my code instead of the style sheet (even though I find it weird that the hover works). Maybe its because I have overridden the mouse events.

What I mean about the external stylesheet is that the style sheet is in a file called MyStyleSheet.qss and gets read in by the program.

Thanks for the help.

[mrjj]

@Robert-Sanson
Hi
loading it from file should really not matter.

So yes, i think it mus tbe somthing in the code. But that easy to test with clean default GUI project :)

[Robert Sanson]

I've decided to sub class the QSplitterHandle and have overridden the mousePressEvent, mouseMoveEvent and mouseReleaseEvent. I did have the ::handle:pressed stylesheet pseudo-state working but now it has stopped working since I have overridden these functions. My assumption is that I need to set this pseudo-state of pressed to true, but I'm not sure how to get this working again. How would I go about doing this?

[mrjj]

@Robert-Sanson
Hi
You must call base class version of mousePressEvent etc so
it can do its normal handling too.