@Jarenward said in Fresh app development:

which Qt is for me?

There is only one Qt :-)
PyQt is a Python binding for Qt and still requires Qt libraries (binaries). So, even if you use PyQt you will need to have Qt libraries which you are using.
If I understood you correctly you need your UI on a computer (not Pi), right? This part is simple - just install the latest stable Qt version an start coding :-)
For the other part you can either directly develop on Pi (using Raspbian you can easily install Qt with apt) or you have to cross compile Qt to develop on your PC. You don't have to cross compile everything, just what you need. See https://wiki.qt.io/Raspberry_Pi_Beginners_Guide

Hi,

You are replacing the central widget in OpenVTK. You should rather add your widget to the current central widget's layout.

@Xenoshell
There is literally like one occurrence on the whole of the Interweb of your error in vainfo (va_openDriver() returns -1)!
https://bugs.launchpad.net/ubuntu/+source/libva-utils/+bug/1719150
It was suggested:

Please install mesa-va-drivers and try gain.

I suggest you try that.... :)

@Oatmeal I guess you already solved your issue since 9 months passed but I experienced same issue today and solved it eventually so I want to share it anyway. Instead of using below code
self.setFlag(QGraphicsItem.ItemIsMovable, True)
self.setFlag(QGraphicsItem.ItemIsSelectable, True)
self.setFlag(QGraphicsItem.ItemIsFocusable, True)
self.setFlag(QGraphicsItem.ItemSendsGeometryChanges, True)
using below code did the trick for me
setFlags(QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsMovable | QGraphicsItem.ItemIsFocusable | QGraphicsItem::ItemSendsGeometryChanges);

Yeah i feel like i do sudo apt-get update && upgrade at least once a day. I just checked about SIP and i compiled it from source but i cant remember if i actually used the command make and make install. Does that mean i have to reinstall pyqt5 again? I guess i just open a new thread. Thanks for all the help @SGaist

For anyone finding this thread via Google OpenSSL actually has a somewhat detailed description about the workaround: https://wiki.openssl.org/index.php/Android#Wrapper_Shared_Objects

@agoose77
Then a composite widget is the way to go as you have done.
Just as a note from other post in case you want inspiration.
https://github.com/paceholder/nodeeditor

Hello again,

Finally, I found a solution : putting actions when creating tabs. Here is my code :

def add_new_tab(self,index,text): new_tab = InterfaceTemplateDialog() self.tabs.addTab(new_tab,text) self.tabs.setTabText(index,text) new_tab.generate_btn.clicked.connect(self.launch) new_tab.run_tranus_btn.clicked.connect(self.run_tranus) new_tab.check_all_btn.clicked.connect(self.check_all) def onChange(self): index = self.tabs.currentIndex() tab_title = self.tabs.tabText(index) tab = self.tabs.currentWidget() if tab_title != "All checked scenarios": scenario = tab_title.split('-')[1] else : scenario ="ALL" return [tab,scenario] def run_tranus(self): tab = self.onChange()[0] scenario = self.onChange()[1] tab.console.append("Beginning of execution of basic TRANUS programs for scenario "+scenario) tab.console.append("Executing loop TRANUS for "+ `tab.spin_box.value()` +" iterations")

Thank you! I didnt noticed that. I did correct this mistakes, but still getting the same error:( and empty window :/

@gabodev
for me it just makes it hard to read and
not pretty in any way. Its just a weakness for me.

But its old horse. let us not beat it more :)

The editor looks so slick so maybe its meant to be :)

@curiosport
this is cpp files so you need cpp compiler.
Then you would open the qiron.pro and compile it all.
It would produce some DLLS in the plugin folder.
Those should be copied to the plugin folder in QtCreator.

Note: the source is for older Qt 4.6 so it might have compile
errors u need to fix if using newer Qt.

That is what I was thinking regarding the compatibility of the two versions, I will attempt the change and let you know

The crash dump only tells me that its a shared memory error, I can't seem to get more detail than that.

It seems related to the system clock time (my application lets users change the time), if it has changed that is when the crashing is occuring.

its a good tool that allows to evaluate queries written in the language of relational algebra and visualize the result of a particular query. i wish to use it in future some time
Thanks
Sr.Dev @ qwikfix

Hi,

PyQt is a library providing python Qt bindings for python, that means you can write python application with e.g. Qt GUI.

QtScript is a (now deprecated) official module from Qt providing javascript style scripting capabilities that is replaced by the QtQml module.

QtLua is a external Qt module written to provide Lua scripting capabilities to Qt applications.

Hope it helps

How can i create my signal for text edit with python3 ?
With as many ways i tried, but I did not succeed .. :(

app = QApplication(sys.argv) # in case qt can`t find image fomat plugins for jpeg app.addLibraryPath(os.path.join(os.environ['QT5DIR'], "plugins"))

Hi and welcome to devnet,

QStackedWidget/Layout comes to mind for that kind of task, but you will need to do some coding anyway

I've already had a look at the Wt, but personally I think that making and editing the GUI using text editors is way to time taking. In my app there's a lot of indicators and parameters so making and aligning it in Wt will take a week ;)
I think that I'll use GUI forwarding via ssh and maybe in the future there'll be a simpler solution.

@sierdzio said:

Thanks a lot for the clarification.

@koahnig,

Thanks a lot for the answer, it is very useful to me

Inside the QTableWidget, I'm guessing I'll have ~100 of my custom widgets at most.

In other use cases (i.e. not in the QTableWidget, but in static layouts), I've had up to 4000 of these widgets, with a few hundred being active (i.e. actively refreshing their data from the backend) at the same time, without any serious performance issues, so I know it scales relatively well.

Also, to elaborate on the solution I offered above: cloning the custom widget proved difficult, because it has a lot of properties (I simplified the problem, the "custom widget" is actually a family of different widgets to fit different data), and because copying Qt objects is not trivial (see http://doc.qt.io/qt-5/object.html#identity-vs-value).

What I ended up doing was write a ContainerWidget to go along the GridWidget. The ContainerWidget has a layout with no margins and is used to display another widget through a setContainedWidget() method. I also added a cloneAndPassContainedWidget() method that does what you'd expect: it returns a new ContainerWidget and gives it ownership of the contained widget. Obviously, after calling the method the original ContainerWidget becomes useless, but the method is called precisely because the original ContainerWidget is set to be destroyed, so that's not a problem. I can now use my GridWidget to display any kind of widgets, it's pretty neat! (I wrote "widget" too many times!)

I realize the "proper" way would have been to write a model, views, and delegates, but that would have required a lot more work.

EDIT: Here's my updated solution: https://gist.github.com/anonymous/a3b2d7e61c6b3e11742c

I'm not sure why nobody replied before me. Maybe most users here are C++ devs and not too familiar with Python? I found your post because you tagged it with "pyqt" and I have some experience with it, so I thought I'd try helping someone while waiting for a reply to my own problem ;)

Anyway, I'm glad your issue is solved. If you can, mark the topic as solved, by editing the subject of your first post and adding [SOLVED] in front of it!

Hello svyatoslav,
Yes I had already referred this URL, that is not enough
Thanks you very much for responding

You're welcome !

Since you have it up and running now, please update the thread title prepending [solved] so other forum users may know a solution has been found :)

@jazzycamel That worked! How would I load a UI file in the Widget class? I tried using uic.loadUI(), but that seems to override the previous gui.