Hi,

Check the file content
Check the file permissions
Etc.

@JonB ok. I'm picking up what you're laying down. I went through my code and made sure my structure is actually following the patterns I've decided on. To answer your question, I do need access to both the proxy model and source model, but thanks for clarifying the distinction. Thank you for your time!

use splash widget?
https://doc.qt.io/qt-6/qsplashscreen.html

I found the problem.

The problem is that I update labels in show_gaze_information.

This function is a callback that is called when a message is published on the topic.

To correct the code, in function show_gaze_information, the message should be stored in a variable. Nothing should be modified in UI.

Then in main body of code, I added this part:

# update gaze infor periodically timer_gaze = QtCore.QTimer() timer_gaze.timeout.connect(update_gaze_information) timer_gaze.setInterval(500) timer_gaze.start()

This code periodically calls update_gaze_information every 0.5 seconds. Now, in this function, I update labels in the UI.

The smoothing done for the antialiasing will not be the same for all colors.

The short version would be to add a set_i2c_data method to your model, update the data frame in it and then emit the dataChanged signal as last step of that method.

Hi,

That's because these classes are no widgets, there are used to build the UI.

In you code snippet, you would use self.nextui.hide() to hide the widget that was created with the help of Registration.Ui_Registration. That is the same for all the widgets you created that way.

thank you sir for your help

Interface is the keyword here: interface != widget.

You build a widget with the interface you defined but the interface itself is not a widget.

@VRonin Yeah you are right. Usually my custom widget has another widgets (like another label for text, button for submit etc.) so I used setItemWidget. But your way better for only images.

Yes, Qt.EditRole and Qt.DisplayRole are the same thing in non-customised Qt classes

Depending on your end goal, you might want to consider using a library like OpenCV to do the zooming part and Qt to display the result.

@alan02011114
I don't understand what your question is. As the error message tells you, your slot requires a dfreceived/second position argument and you are not supplying it in your lambda so you get the error.

@Pythonic-person said in Widgets with SizePolicy there is no effects:

Do you mean taking the main window size and then change the widget size with the code?

You either use one of the provided layout mechanisms, develop you your only layout implementation, or you do all the resizing of contained widgets yourself 1990's style.

If you wish to do it yourself then you need to override the resizeEvent() of the container widget and resize the contained widgets yourself using whatever logic you see fit.

@CEO said in How to display QTableWidget selected row in a qLineEdit of the same class?:

@JonB now I discovered you are either hoarding knowledge or might not have done any work on the question.

Yes, you're right. I have nothing better to do than lie to questioners about what I know and they should do, and I don't spend enough of my time writing the code demanded to save them time.

Here is an extract from my usage of the QDataWidgetMapper which I know nothing about from a sample project of mine. I'm sorry if my variables/widgets/model are not the same as yours. Also here I happen to be binding to QSpinBoxes, let me know if I need to change it to QLineEdits for you.

void SectorRegisters::initDataWidgetMapper() { // set up the `QDataWidgetMapper` this->dwm = new QDataWidgetMapper(this); // set model (this->sectorsModel is the model being used, in my case it's a `QStandardItemModel`) SectorsModel *sectorsModel = this->sectorsModel; dwm->setModel(sectorsModel); // Vertical => widget mapped to row dwm->setOrientation(Qt::Vertical); // current index is always column #0 dwm->setCurrentIndex(0); // Region mappings dwm->addMapping(ui->spinRegionSocialState, SectorsModel::RegionSocialState); dwm->addMapping(ui->spinRegionGoodAreas, SectorsModel::RegionGoodAreas); dwm->addMapping(ui->spinRegionPoorAreas, SectorsModel::RegionPoorAreas); dwm->addMapping(ui->spinRegionCash, SectorsModel::RegionCash); // Here there are many further widget<->model-column mappings // ... }

You're welcome.

Did you consider using the QtGraphicalEffects module ?

@Lalremruata said in How to avoid Null or empty value in QLineedit of Pyqt5:

even the self.lineEdit_2 is empty.

Are you really 100% sure? I used PyQt5 and I'm pretty sure self.lineEdit_2.text() == "" would work as expected. Get rid of all your other code and behaviour and check just this in a tiny program?

@jsulm

You should rather use https://doc.qt.io/qt-5/qstring.html#isEmpty

My understanding is PyQt5's QLineEdit.text() returns a Python str rather than a C++ QString anyway. I never found using QString methods of any use in PyQt5.