Blinking of pop-up widgets on Raspberry OS

IknowQT

A class that inherits qdialog from Raspberry Pi OS is popped up.
The popped up widget has the focus, and the controls of other widgets cannot be selected.
The problem is that when I click on another control, the popup widget flickers.
It seems to be a problem with focus shift.

There was no problem when running on Linux OS, and it worked well on Windows as well.

ui.setupUi(this);
this->setWindowFlags( Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint);

===================

if (!m_wSTCMenu->isActiveWindow())
	{
		QPoint position(this->ui.frm_Bottom->geometry().x(), this->ui.frm_Bottom->geometry().top() - m_wSTCMenu->size().height());
		position = mapToGlobal(position);

		m_wSTCMenu->move(position);
		m_wSTCMenu->exec();
	}

jsulm

@IknowQT said in Blinking of pop-up widgets on Raspberry OS:

The problem is that when I click on another control, the popup widget flickers

Do you mean on other widget (other window than the dialog)?
If so then this is normal behaviour of the window manager used. You have same on Windows for example.

IknowQT

@jsulm said in Blinking of pop-up widgets on Raspberry OS:

Do you mean on other widget (other window than the dialog)?
If so then this is normal behaviour of the window manager used. You have same on Windows for example.

It is a widget popped up on the qt widget and it is clicked outside the popup widget area.
On Windows, this doesn't happen.

problem gif

Can you check the gif attached to the link?

jsulm

@IknowQT I think this is the behaviour of your window manager, not Qt.
Can you test with other, non-Qt application, with a modal dialog?

IknowQT

@jsulm

I got a hint from what you said, so I made the screen a little smaller instead of full screen.

problem2.gif

Is it because the Standard Curve widget behind is not in Modal shape?

jsulm

@IknowQT said in Blinking of pop-up widgets on Raspberry OS:

Is it because the Standard Curve widget behind is not in Modal shape?

What do you mean?
A dialog is either modal or not.

IknowQT

@jsulm

So, is there any way to solve this problem?
i want to do full screen

jsulm

@IknowQT Do you use a window manager?

IknowQT

@jsulm

no it doesn't matter
Do I need to change the settings on Raspberry OS?

jsulm

@IknowQT said in Blinking of pop-up widgets on Raspberry OS:

no it doesn't matter

What does this mean? Yes or no?

IknowQT

@jsulm

No no

IknowQT

@jsulm

I tried removing the taskbar of Raspbian and running it, and the same symptoms appear.
Is there any other way?

IknowQT

@jsulm

Is there no way in qt?
I tested the same in Ubuntu OS, but the same phenomenon as in Raspbian does not appear.
For me this is a very important issue.
You may need to change your development direction and environment.

jsulm

@IknowQT What graphics environment and window managher do you use?
Do you use X server?

IknowQT

@jsulm

How can I check?
I'm not very good with Linux commands.

jsulm

@IknowQT You should know what you installed.
What does

ps ax | grep X

output?

IknowQT

@jsulm

 539 tty7     Ssl+   0:00 /usr/lib/xorg/Xorg :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
  618 ?        Ssl    0:00 /usr/bin/lxsession -s LXDE-pi -e LXDE
  845 ?        Sl     0:02 lxpanel --profile LXDE-pi
  846 ?        Sl     0:00 pcmanfm --desktop --profile LXDE-pi
 4762 pts/0    S+     0:00 grep --color=auto X

jsulm

@IknowQT So, you have X server running and you're using LXDE desktop environment.
You could try with some other desktop environment to see whether it behaves in the same way (XFCE for example).

IknowQT

@jsulm

Are you saying you need to test on a different version of the OS?

jsulm

@IknowQT No. I did not say anything about a different OS version. I only suggested to test with another desktop environment (window manager). On Linux there are many different desktop environments...