Language Bindings

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  UNSOLVED Some issues with QTextEdit (PySide2)
  • kvutza

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  Hi, I encountered it when developing a simple app. I was able to deal with it somehow, thus this is meant as a notice about these issues for Qt people.

  The missing signaling on select-all event can be seen by commenting out self.highlight_current_line() at (one of) def selection_changed(self): there.

  The issue with line highlighting of right-aligned lines can be seen by adding self.setAlignment(QtCore.Qt.AlignRight) at one of the QTextEdit-based classes, like at class CmdTextEdit(QTextEdit): e.g. just before self.setUndoRedoEnabled(True) by the end of its __init__:

  self.setAlignment(QtCore.Qt.AlignRight)
  self.document().setModified(False)
  self.setUndoRedoEnabled(True)

  with the self.document().setModified(False) being put there to convince Qt that this setting is still within initialization.

  BTW I've seen at the Qt example that line numbers are thought to be drawn by painters, though the painter did not want to work for me (complaining about something, may be about being not active, not sure now). And since I did not know how to convert that example onto partially-seen lines anyway, I did it a different way.

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  UNSOLVED PyQt4 - How can I store the value of a QTableWidget cell before cellChanged signal is emitted
  • AbdelrahmanSaid

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  It's essentially the same, most of the time you have some translation to do from one language to the other, but the logic is exactly the same.

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  UNSOLVED Qtextdit format A4
  • Jacky2678

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  Advanced design techniques
  • iamlion12

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  Thank you! Second example is really what I wanted!

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  UNSOLVED Runing a .exe inside a form
  • HugoMendes

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  Hi HugoMandes,

  see the Qt-Documentation -> http://doc.qt.io/qt-5/qprocess.html
  It's also possible to get the window handle from the Qt Widget (http://doc.qt.io/qt-5/qwidget.html#winId).

  But in the past I want to embedded the Microsoft Excel inside the Qt application and this not work very well. I think it's easier to use only the microsoft eco system if possible - or a work around before embedding/drawing/event-handling a application inside a Qt application.

  Regards,
  Jakob

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  SOLVED Qtreeview &QSortFilterProxyModel, select/scroll/expand to entry (pyqt5)
  • hermes

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  @SGaist said in Qtreeview &QSortFilterProxyModel, select/scroll/expand to entry (pyqt5):

  mapFromSource

  Thanks for your answer!
  While I was so sure, I had tried it already, obviously I had not.... It now works.!

  Thanks a lot!!

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  UNSOLVED how to create custom style class on PyQt4 / PyQt5
  • Jorgen

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  @SGaist thx for the hint. Will look into it

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  UNSOLVED trying to open .so with QLibrary
  qlibrary open .so • • quinroux

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  Hi and welcome to devnet,

  Are you sure you library can be found ?

  What version of Qt are you using ?
  On what platform ?

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  SOLVED qtreeview select single item & column
  • hermes

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  Thanks a lot for the hints!

  I had tried these without success but your input triggered me to look further in this direction and I discovered something called selectionbehavior.

  In pyqt5 I use:
  self.view.setSelectionBehavior(QAbstractItemView.SelectItems)

  Thanks again!

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  SOLVED pyqt5 qtreeview QAbstractItemModel set coloring of single column based on function?
  • hermes

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  Great, I had missed that....
  I simply could not believe that it is actually that easy...

  Thanks a lot!

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  SOLVED qmake fine tuning
  • Stanislav Silnicki

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  @Stanislav-Silnicki long story short: i did it.

  write correct targets interdependency in .pro: #------------------------------------------------- # # Project created by QtCreator 2018-04-02T04:41:55 # #------------------------------------------------- QT -= core gui TARGET = andy TEMPLATE = lib DEFINES += ANDROID_ANDY_LIB_LIBRARY SOURCES += \ andy_native.cpp HEADERS += \ com_andy_EartActivity.h \ andy_native.h firsttarget.target = firsttarget firsttarget.commands += javac -cp /home/user/Android/platforms/android-26/android.jar:/home/user/Unity-2018.1.0b8/Editor/Data/PlaybackEngines/AndroidPlayer/Variations/mono/Release/Classes/classes.jar -sourcepath java/src java/src/com/andy/AndyActivity.java -d java/classes secondtarget.target = secondtarget secondtarget.commands = javah -cp java/src com.andy.AndyActivity lasttarget.target = lasttarget lasttarget.commands = jar cvfM andy.jar -C java/classes . libandy.so QMAKE_EXTRA_TARGETS = firsttarget secondtarget lasttarget PRE_TARGETDEPS = firsttarget secondtarget DISTFILES += \ java/src/com/andy/AndyActivity.java

  this will produce first three targets while in first make invocation.

  Than, the last forth target (.jar) has to be built during second make invocation, that is added via QtCreators menu:

  note, last two default build steps in QtCreators menu are disabled. This saves compile time. It just adds no value to my goal.

  We are the champions! ))

  UPDATE: just couple sidenotes for those, who stucks in android's development like I constantly do:

  a) packing native libYourNativeLib.so in java's .jar will make it hard to init... so, finally I refused this approach and just left binary lib for deployment as a separate file.
  b) if your Android app will crush due to inability to load gnustl_shared, just add this line in qmake's .pro:

  QMAKE_LIBS_PRIVATE -= -lgnustl_shared
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  UNSOLVED Pyside2 5.9 Branch/QT 5.8/GCC 6.4/Linux - Build Failure
  • GrandCentralDispatch

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  I had the same error with gcc 7.3. I ended up just using clang for compiling as that seemed to work:
  CC=clang CXX=clang++ python setup.py build --qmake=/usr/bin/qmake-qt5 --ignore-git --build-tests --jobs=8

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  UNSOLVED PySide Signals not being sent to Slot, from QThread object.
  • jscosta

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  Hi and welcome to devnet,

  There's no event loop running at all. Therefore signals and slots won't be working.

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  UNSOLVED python-pyqt5
  • peter_cz

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  SOLVED singleton in python, with qobject
  • user4592357

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  The following is my implementation (and a usage example) of a singleton I use regularly:

  try: from PyQt5.QtCore import pyqtWrapperType except ImportError: from sip import wrappertype as pyqtWrapperType class Singleton(pyqtWrapperType, type): def __init__(cls, name, bases, dict): super().__init__(name, bases, dict) cls.instance=None def __call__(cls,*args,**kw): if cls.instance is None: cls.instance=super().__call__(*args, **kw) return cls.instance if __name__=="__main__": from PyQt5.QtCore import QObject, pyqtSlot, pyqtProperty class MyObject(QObject, metaclass=Singleton): def __init__(self, parent=None, **kwargs): super().__init__(parent, **kwargs) self._x=0 def x(self): return self._x @pyqtSlot(int) def setX(self, x): self._x=x x=pyqtProperty(int, x, setX) print(MyObject().x) MyObject().x=1 print(MyObject().x)

  I've actually shared this example/technique so many times now that I just quickly created a git repo (https://github.com/jazzycamel/PyQt5Singleton) and a PyPi package (https://pypi.python.org/pypi/PyQt5Singleton) so you can just install it via pip:

  $ pip install PyQt5Singleton

  and use it (as above):

  from PyQt5.QtCore import QObject, pyqtSlot, pyqtProperty from PyQt5Singleton import Singleton class MyObject(QObject, metaclass=Singleton): def __init__(self, parent=None, **kwargs): super().__init__(parent, **kwargs) self._x=0 def x(self): return self._x @pyqtSlot(int) def setX(self, x): self._x=x x=pyqtProperty(int, x, setX) if __name__=="__main__": print(MyObject().x) MyObject().x=1 print(MyObject().x)

  Hope this helps :)

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  SOLVED PyQt doesn't understand &
  • user4592357

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  Pylint might not find everything and you may have to help it searching for your dependencies.

  As for the underline, it’s a Windows behavior.

• 

  UNSOLVED Is it possible to have superscript within the char* argument to the tr() function - particularily superscript 2(^2)?
  • CLang

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  @CLang

  I now tried your example with HTML: it would look like this:

  QString plotYAxis = tr("Emission Factor(g/m²h)");

  and I got this nicely rendered on a QLabel.

• 

  SOLVED too many positional arguments for constructor call
  • user4592357

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  found out the reason. it should be window_flags=Qt.WindowFlags(), not window_flags=None

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  SOLVED check for non valid object
  • user4592357

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  @user4592357
  And do what if it isn't? You're only going to raise, and self.mw.addDockWidget will raise anyway if it isn't. Plus self.mw = QMainWindow() would have raised in the first place if it couldn't create a main window.

  Of course you can check everywhere if you wish. But that can be a lot of code. I wouldn't bother here.

  P.S.
  Unless you're doing it for a school project. In which case, goodness knows...

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  SOLVED PyQt5 closeEvent reimplementation
  • user4592357

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  In the python case, that's indeed something debatable. Most of the time, people don't need to implement __del__.

  What I would do is to store the settings once you close the corresponding dialog so that you avoid the trouble you had with the unintended interruption you have (unless it's done while the dialog is open).

  In the extreme case, you can even save you settings on modification if you have an "apply immediately" without cancel style of application preferences.

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  SOLVED initializing an attribute in __init__
  • user4592357

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  No it's not.

  See this excellent article from Arne Mertz on the subject.

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  SOLVED PyQt (but possibly C++) Very simple signal/slot "transference"/encapsulation?
  • JonB

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  Same as before except that you will have two Q_SIGNAL in the connect statement if using the old version.

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  UNSOLVED insert text to textbox and..
  • Dl10

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  @Dl10 said in insert text to textbox and..:

  I managed to thank you all !

  it looks like you have solved your problem, so two things please: write a reply showing how you actually solved it :-) and two, don't forget to mark you post as solved. Thanks.

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  UNSOLVED add delay in python
  • Dl10

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  @Pablo-J.-Rogina
  It's difficult to guess what the OP means, but he says:

  my intent is function style time.sleep but Other.

  but it seems he is aware of Python time.sleep(delay) but doesn't want to use it...! :)

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  UNSOLVED QTableView row selection highlight pyside2 issue
  • TedX

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  Ok. i cant find any other reporting that issue.
  You could look in https://bugreports.qt.io
  If you can reproduce it with a minimal example, then open bug report.

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  SOLVED Python/PyQt freeing of objects
  • JonB

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  @SGaist
  Great stuff --- I'll study that link.

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  UNSOLVED Code suddenly stops at self.cam = QCamera() , PyQt5.9.2, Qt5.9.3, Python3.5
  python pyqt • • Xenoshell

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  @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.... :)

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  UNSOLVED Convert .ui to .py file?
  • Dl10

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  @Ken_Du
  I use PyCharm as my Python/PyQt IDE, and I shan't be moving off that. But OOI does your eric really do much other than allow you to convert .ui to .py, which I see I can do via PyQt's pyuic5?

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  UNSOLVED How i can check if char is '\'?
  • Dl10

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  @SGaist said in How i can check if char is '\'?:

  To add to @JonB: file_ += char would be even cleaner.

  I left it using the literal rather than the "variable", as it's not obvious from the context whether OP really wants the same char he's testing for appended or always a \, if you see what I mean!

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  UNSOLVED How to jump millisecond in video?
  pyqt5 • • Dl10

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  Hi,

  What résolution are you expecting ?

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  UNSOLVED Build frames in GUI Program
  python • • Dl10

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  A quick google search with PyQt5 layout gives that nice article.

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  UNSOLVED Adding video window
  pyqt5 • • Dl10

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  Well... Then you can translate the example from the class detailed documentation in Python and you have a minimal video player.

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  UNSOLVED Picamera significant delay and low FPS, but low CPU and memory usage
  python • • Walorda

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  @jazzycamel said in Picamera significant delay and low FPS, but low CPU and memory usage:

  Thanks this worked i also changed the camera parameters so it runs even faster.

  self._camera=PiCamera(sensor_mode=4,resolution='640x480',framerate=40).

  Now the only problem is when i try to capture using the worker thread is not responding to the signal ,this is also happening with the stop function its not responding to a button click or custom emit signal to stop the camera it just keeps running

  @pyqtSlot() def snapshot(self): self._looping=False self._camera.capture('image.jpg') self._looping=True stopcamera = pyqtSignal() self._thread = QThread() self.stopcamera.connect(self._camera.stop) self._thread.start() self.CameraSnap.clicked.connect(self._camera.snapshot) self.CameraBack.clicked.connect(self.functionstopcamera) def functionstopcamera(self): self.stopcamera.emit()
• 

  UNSOLVED How I can to part?
  pyqt5 • • Dl10

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  @Dl10

  Hi
  I think it exists

  https://www.youtube.com/watch?v=Dmo8eZG5I2w

  There you just place 4 qframes on center mainwindow
  Then right click (not on frames) and from layout menu
  select Grid layout

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  UNSOLVED Adding to my project
  • Dl10

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  UNSOLVED QMdiSubWindow Buttons Merged With Menubar
  • jmwright

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  @SGaist Thanks for the reply. It has the same behavior in the MATE desktop environment. So far I've also tried in Unity and Gnome 3.0 as well.

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  UNSOLVED How can I delay but not time.sleep?
  pyqt5 • • Dl10

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  @Dl10
  You may split the function and start a timer.. something like..
  from :

  testFunction(){ step1.. step2.. time.sleep().. step3.. }

  to

  testFunction(){ step1.. step2.. qtimer t; connect(&t,SIGNAL(timeOut()),this,SLOT(testFunction2())); t.start(2000); } testFunction2(){ step3... }

  PS: Syntax may vary.. this is a c++ code.. please convert it to pyqt5.. Hope this is what you are expecting...
  and thats what i understood from your post...

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  UNSOLVED pyqt4 float slider
  • tiaencai

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  Hi and welcome to devnet,

  What slider are you talking about ?

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  SOLVED Accessing the main window from Python
  • JonB

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  Well, for right or for wrong architecturally, I ended up writing a function (Python, but you get the drift :) ):

  def findMainWindow() -> typing.Union[QMainWindow, None]: # Global function to find the (open) QMainWindow in application app = QApplication.instance() for widget in app.topLevelWidgets(): if isinstance(widget, QMainWindow): return widget return None

  No Python global variables --- which I now understand, are about as "global" as the parochial village I live in, are misnamed really, and are brain-dead in the way they work :)

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  SOLVED Two (probably) very simple questions
  pyqt • • Sorren

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  @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.