General and Desktop

@JonB Oh, I didn't know you could install a delegate for just one column. I think that will work then, I'll try this. Thanks for the hint :-)

@qt-1234 Could you share the code you're using to drag the "Off button" label and any code related to it? And show us exactly how it goes off your desired Y-Axis, take a screenshot or a GIF if possible.

@MyNameIsQt said in Problem with QString storing file path: CBackground::CBackground(unsigned int cnt, const QString &fileName, const QImage &img) : m_pBkgndHeader{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, m_strBkgndImagePath(&fileName) Hello dangling pointer... c++ basics.

Thanks for your suggestions, @J-Hilk @J-Hilk said in Slow application with low CPU usage: I would suggest emitting a signal, signalling data is processed, and then a mutex guarded getter function, that allows the other thread to access the required data. I'm not sure I understand what you mean. Should each object have a mutex-guarded getter function? Should the objects be in different threads? In this case, wouldn't the emitted signal get queued? I'd appreciate it if you could provide me an example and/or some material for further reading. Another idea that has occurred to me is that I could use two threads, one for processing and one for GUI (this one updated just from time to time). Do you think it would make sense? My concern is that the processing thread must be fast enough to complete its cycle before a new piece of data comes in. If this is the case, would it be necessary to use a mutex anyway?

@mhanusek https://stackoverflow.com/a/58510085 If the target is a library, the flag -fPIC is added by CMake to the compilation and linker steps. If the target is an executable, the flag -fPIE is added by CMake to the compilation and linker steps. This helps: add_executable(exe_name ... ) target_compile_options(exe_name PRIVATE -fPIC)

@kendo To make it clear for the future: @Christian-Ehrlicher asked you which Qt version you are using! What you are showing is the Qt version which was used to build QtCreator... You should know what Qt version you installed, you can also check the Qt version in QtCreator configuration in "Kits" tab.

@ChrisW67 I don't think this is an error in running WebPConfigInit. Because it doesn't execute the function.

Hi, You might want to check this project which aims to help with regard to customize the NSWindow in a similar fashion as want you want.

@SimonSchroeder said in QLineEdit: This assumes that the value returned by the SQL query is in the proper encoding for a QString. As you mentioned the encoding of your DB is UTF-8. No, you're wrong. When the column type is a valid string-type (e.g. text, varchar, ...) then a QString is returned. The problem here is that it's either not a valid column type for a string or (which I assume) the internal conversion to a QString is wrong - but I will not touch Qt5 sources, it all works correct in Qt6.head.

Do you need it to not appear at all? or is it okay for it to appear then get removed? Also, how do you select a thumbnail? And what happens when you select a thumbnail? Or is this just a gallery, a display or something like that where you don't want anything to happen? Mentioning your use case would make it more clear to us, and help us suggest an approach that works for what you're trying to do.

https://forum.qt.io/topic/121958/cmake-error-with-msvc-in-clion/7

@jsulm I use setDetailedText because I want to hide all the details at first. The problem is that when the user clicks in the show details button the text box shown is too small.

@ulix You have a QTimer in a thread which does not run the Qt event loop, does it? So no signals will be delivered. Hence your finding: The timer expires but the slot never gets called, by the way if a I call QCoreApplication::processEvents(); after the sleep time the slot gets called. That processEvents() is the first time the evet loop is invoked. Your thread needs to be running the event loop all the time if that's where the timer is ticking (unless you move the timer to the main UI thread). See QThread::run() & QThread::exec().

@Dummie1138 What does "being edited" mean for a QSpinBox? The only thing you can check for is whether it has focus. There is no editingFinished signal. Separately: you have a timer expiring every second and code in ticker() which adds 1 second for the time to show. How accurate do you expect this to be? The timeout may occur any time after 1 second has elapsed. You should not rely on it expiring at exactly one second. This may mean your time "wanders" over a period. Suggest you use a QElapsedTimer or re-read the wall clock time and subtract the start time periodically.

@jsulm my UI created using qtcreator ui designer, the app still run normal, no stuck, no "not responding"

@Umer As @jsulm says. Note that a widget (or for that matter a layout), such as a "table", is an actual object and cannot be in two places at the same time. If you want it to appear on the main window and also elsewhere on another window you need to create separate instances.