Qt | Qt development knowledge and experience summary

A part of my form contains QGroupBox (Status Box) with 4 child QGroupBoxes arranged in a grid layout (2x2). Two bottom QGroupBoxes (Widget 1 Box and Widget 2 Box) contain widgets of fixed size (with set minimumSize and maximumSize) so they're non-resizable at all in both directions. Because of that rigid size constraints top row of QGroupBoxes (Summary Box and Helper Box) can only be resized in vertical direction.

And here comes the troublesome part. Top-left QGroupBox (Summary Box) have grid layout 5x3 while top-right (Helper Box) have vertical layout with 6 rows. If I have naive widget placement as shown on picture 1 Qt is enlarging vertical size of both labels in top row to make height of both QGroupBoxes equal (see red arrows on picture 1).

This is definitely that I don't want so I've added vertical spacer to the bottom of Summary Box and from the first glance it worked (picture 2). But only from the first glance... What you see is the minimum height of my whole form and the bottom side of spacer and last QCheckBox in the Helper Box seems to be aligned.

If I'm expanding my form vertically this spacer grows a bit and that causes the increase of height of both top QGroupBoxes. As a result spacing between QCheckBoxes increases too and we can also see that top and bottom spacing are unequal for the top-right box (see red arrows on picture 3).

I've tried to play with sizeType for my vertical spacer. If I set it to Minimum or MinimumExpanding then the spacer doesn't grow on resize (and doesn't shrink, too) but it appears to be expanded to the size as on picture 3 (corrupting spacings between QCheckBoxes too). If I set it to Maximum, Preferred or Expanding then I observe the same behavior as described above for picture 3.

What is the proper way to achieve alignment for two QGroupBoxes in a row of grid without affecting spacing between elements (e. g. in that case make vertical spacer to fit only single row of grid layout and never expand/shrink)?

I've started to create UI tests for my PyQt5 widgets using QtTest but have run into the following difficulties:

• In order to speed up things, some of my widgets only perform operations when visible. As it seems that QtTest runs with invisible widgets, the corresponding tests fail.

• For the same reason, I cannot test program logic that makes a subwidget visible under certain conditions.

Is there a way to make widgets visible during test? Is this good practice (e.g. w.r.t. CI test on GitHub) and is QtTest the way to go?

I have tried to use pytest with pytest-qt without success as I couldn't find a proper introduction or tutorial and I do know "Test PyQt GUIs with QTest and unittest".

Below you find a MWE consisting of a widget mwe_qt_widget.MyWidget with a combobox, a pushbutton and a label that gets updated by the other two subwidgets:

How to get the return value? Attach my code. My intention: Want to check the QListWidget and if it's empty, a message Box popup will raise and ask the option from the user. Problem: At the stage of beginning itself, a Message box popup will display, (I don't want it at the beginning stage), If the QListwidget is empty then the MessageBox popup will display as desired, and if we select "Yes" or " No" Button, Nothing will return/print in the first file. How to resolve?

Main

I'm trying to figure out how to create a timeout for the handshake process in a TLS connection in a QTcpServer.

I tried something like this in the overriden incomingConnection function:

I am implementing a function which searchs a QModelIndex based on a QString input. However if I cannot find this index, the function should retun an invalid index. My model is a QStandardItemModel.

Is is okay to return invisibleRootItem()->index() as an invalid index? In the qt documentation is noted that it will always creates an invalid index.

I have a python code that I can add multiple rectangles on a QGraphicsScene.

So I have a Qt StyleSheet called main.qss in the style sheet I am trying to set width and height it doesn't work it just remains the same. This same thing happens for Margins aswell.

Here is the QSS:

What my code is about: I'm currently working on a project to create an image browser for all the images I have in my PC. I have created a database of all the images, this app will give me the ability to search through the database to find, and view and cycle through the images.

What my problem is: I'm trying to read left and right arrow key presses and connect them to a function that will change the shown image to the previous or next image in sequence. But for some reason the first two left-arrow presses don't register and none of the right-arrow presses register. Also, no other key presses are registering. My guess is that this is happening because the arrow keys are cycling through the widgets on screen. Need ideas on how I can fix this.

I would like to have folder with tiles realTiles in folder with .exe.

Of course I can add folder to qrc and everything is ok: