Application hangs after using up/down arrows in scrollbar of scrollarea widget
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wrote on 21 Mar 2025, 10:12 last edited by
This is how the screen looks like. I have hidden sensitive information.
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Can you provide a minimal compilable example that reproduces this behavior ?
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wrote on 22 Mar 2025, 05:08 last edited by Vidya H
I tested the example code in Qt and it works fine on the target board. I am using linuxfb platform. Could this be something to do with the environment variables?
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wrote on 25 Mar 2025, 11:43 last edited byThis post is deleted!
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I am running a Qt5.15 based application on a embedded Linux platform target. I have a QScrollArea widget to display particular information. There is a scrollbar with up and down arrows.
When I use the scrollbar, the scrolling is smooth. However, when I press and hold the up/down arrow, it starts to scroll and within few seconds, the UI hangs.
Please suggest how to fix this. Let me know if further details are required.
wrote on 25 Mar 2025, 14:54 last edited byThis post is deleted! -
@SGaist , could you please help on this issue? Is this due to Qt framework or my application or root file system or environment variables setting? I want to narrow down the issue.
@Vidya-H If the Qt example is working properly on the target then it means that something is wrong with your application.
Not knowing more about it, one classical way to find the issue is to remove everything from the application then add gradually things back until it breaks again.
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wrote on 26 Mar 2025, 08:19 last edited by
Okay. I added delay of 20 millisecond when scroll bar value changed. I am seeing performance improvement with this. The application hang frequency has reduced drastically. Is this a correct approach? Please suggest.
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No it's not a correct approach.
You have to find what is currently slowing down your application.
Like I wrote above, the most basic version of it is starting from scratch adding your elements one at a time to determine what is going wrong.
Another option is to instrument your application and analyse it with a tool such as Hotspot. -
wrote on 27 Mar 2025, 05:37 last edited by
Thank you for the support. I will use this tool for further analysis.
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