Qt for Python

You're likely on Windows 11 and the new windows11 style has some issues.

@JimLomax said in Draw lines,arcs at design time then change color on an event at runtime: There is no QGraphicsArcItem, the ellipse item can be told to create partial ellipses but I haven't found a way to make it create arcs - it creates pie pieces. 2. Using the QGraphicsPathItem sort of works but I haven't found a way to stop it adding a line to the start of the arc I don't have anything to say about QML vs widgets as I only use the latter. But if you are still interested in how to draw an arc on a QGraphicsScene without the pie/line QT QGraphicsScene Drawing Arc shows how to do that.

You're welcome ! Since this is what you wanted, please mark the thread as solved using the "Topic Tool" button or the three dotted menu beside the answer you deem correct so that other forum users may know a solution has been found :-)

Making everything into custom widgets would be more work that sticking with that big class, but I'll definitely keep this in mind. Thank you both @jsulm and @JonB for help.

Hi, It seems you have indeed found something. It's reproducible as well in C++. You should open a ticket on the bug tracker with you reproducer (don't forget to check if something similar has already been reported).

Hi and thanks for your welcome. Good question, I'm trying to create Qt bindings for Ada language. Some attempts with C++ were failing due to some C++ subtleties. But Python provides C API which I can used easily with Ada. I provide some very first Qt bindings for Ada. But class inheritance is still in Python. I wanted to make them full Ada. I'm able to instantiate a class inherited from QRasterWindow (for instance) but a call to the method metric (for instance) provoques a seg fault. (for simplicity I post the code in C)

@SGaist Thanks

That works. If the parent has row() and column() values of -1, then that indicates the parent is the root node.

@Toastito said in How does PyQt5 handle system dark and light mode transitions?: The downside is that PyQt5 will still send a palleteChanged signal/event when the system theme changes. Ideally, I would've been able to block it and implement my own. I haven't tried, but would expect an event filter to be able to filter out PaletteChange events. The QGuiApplication::paletteChanged signal doesn't appear to be connected to anything by default. QObject::disconnect() without a receiver would ensure that, for any existing objects at the time of the call. Note that disconnecting signals at random can have surprising results.

@jsulm Thank you. I will look into that!

Hi, It seems you would need an item on top of your images that you would paint transparently and then use something like QPainterPath to create the shape for your selection. The QGraphicsPathItem might be enough for your needs. Hope it helps

@Al3x said in VPN connect app. PyQt5. how to display output in second display?: Because hes an ignorant fool! I already told you to stop to behave this way. You will be banned if you continue to insult other people. Last warning...

Hi, I don't think you can do it as integrated as you would like as neither of these widgets are native controls. From a quick search, the API of interest is NSSpellChecker.

@3n3l I don't know about the whole area, but you can set an environment variable as the first statement in a Python program if that is what you need for the later code?

This looks like your Qt version is way too old. PySide2 also does not support the platform; please use the current version (PySide 6), see https://doc.qt.io/qtforpython-6/gettingstarted/index.html for cross build instructions.

@DieterV said in "corrupted size vs. prev_size while consolidating" or "double free or corruption (!prev)" from thread: I can try to write a compact example that exhibits the same issues to demonstrate what I'm doing That would be nice

@MasterQ Yes, that allows you to delete whatever widget is on the tab if you wish. However, I don't think a tab has to have a widget, so to prevent error: if widget is not None: widget.deleteLater()