Qt for Python

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  UNSOLVED Packaging ui files and code into an executable file
  • BlueBreezy

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  UNSOLVED How to implement a UI for a specific thing
  • sdf1444

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  Well you start by not using the Designer because you are going to want to have complete control of all the objects this is going to use. Next you learn how to code in pyqt using its native Layout elements along with the various buttons. The vertical sliders are not overly difficult but those on/off buttons over the vertical sliders might require specialized implementation as you may have to make your own. The LineEdit boxes and Labels are no issue either. But yes this could ALL be implemented by using pyqt. However that means diving into many many elements of pyqt to answer properly or give you the fish and then you miss out on the fun of catching (designing and making) your own fish (view).

  However I am running a Python/PyQt Discord message server where this kind of one-on-one help can be obtained for the same cost of posting a question on this forum ;) (aka free) just drop me a PM or post an email and I will send you an invite. But be prepared to learn how to fish ;)

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  UNSOLVED MacOS: QLineEdit height when changing font-size in stylesheet
  • rmweiss

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  Okay cannot answer if its a bug or just an undocumented feature ;) but I was experiencing presentation issues on Win10 so its not just related to the Mac OS still I fixed it using too different commands

  if __name__ == "__main__": GuiThred = QApplication([]) GuiThred.setStyle('fusion') class MainWIndow(QMainWindow): ... self.setStyle(QStyleFactory.create('Cleanlooks'))

  Of course there are other styles other than Fusion but I also read that some folks feel you ought not to change the style but personally if its not displaying correctly and that fixes the issue frankly I am not so concerned unless the program specs call for the program to allow for various presentation styles because unless it does I am not going to go down that overly extensive path due to the amount of testing that would be required to support that implementation. My motto make it work and once you have a working version then decide if it is worth the effort to implement something more expansive the answer most of the time is no it is not.

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  UNSOLVED Can't View Code in Qt Designer
  • sergioloz

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  Note to make the transition even easier I have helped and I am continuing to help others move away from the Qt Designer to writing their own PyQt5 interfaces from scratch so if you are having any issues with this or do not know where to best start just give me a holler.

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  UNSOLVED Shrinking pixmap and showing overlay
  • Cinemaster

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  UNSOLVED Is there a way to manipulate Qmediaplayer frames and display? Or Draw on it with a transparent widget which will not affect the video?
  • codersmurf

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  UNSOLVED QWebEngineView: PySide2 5.13.x, OpenGl Buffer error when freezing with pyinstaller
  • Dagginio

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  SOLVED Slot with extra argument
  • GF GEPI

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  @denni-0
  I think I have found the way to factorize my code, using lamdba to give an extra argument.

  s1 = Signal(bool) s2 = Signal(bool) ... s1.connect(lambda flag: test(flag, w1)) s2.connect(lambda flag: test(flag, w2)) ... def test(flag, wg): if flag: wg.setTooltip('OK') else: wg.setToolTip('Not OK')

  Note that it works:

  with or without the @Slot(bool) decorator with an user-defined signal s_user = Signal(bool) or a built-in signal such as stateChanged

  As stated here, this may be generalized with:

  obj.signal.connect(lambda p1, ... , arg1=val1, ... : fun(p1, ... , arg1, ... )) ... def fun(p1, ... , arg1, ... ): [...]
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  UNSOLVED Installing PySide 2 for Ubuntu 18.04
  • JonB

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  @denni-0
  You may be right about that, I don't know, I don't like these "virtual environments", so I have never created one.

  The problem I am reporting ("can't load QMYSQL") only occurs when I try to run inside the PyCharm debugger, not if I just run the apps outside. That confuses me, as it seems it's not the environment the program has which causes the problem, rather it's to do with environment/search paths being used by PyCharm debugger which is somehow (incorrectly) picking up (certain) files from the completely unrelated environment, and then complaining. Given this, I am quite unsure who needs the venv, maybe it's just the PyCharm environment, goodness knows. Sigh :(

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  UNSOLVED When Use @Slot(), sender has NoneType.
  • klyjm

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  Okay to use a @Slot() you need to use a Signal. The connect you are using is not an in code Signal as you have not defined it as such that is just a standard connect that connects your function to a system Signal which seems to be handled differently. Yeah sort of the same thing but not the same thing. This is a basic in code Signal/Slot definition where the MySignal is defined within the Class and used where the Class is instantiated and that is also where the Slot would be defined

  MySignal = Signal() self.Class.MySignal.connect(self.select_leg) @Slot() def select_leg(self): pass

  This is how you would declare a standard Button and I assume a Radio Button is pretty much the same

  self.btnLeft = QPushButton('Left') self.btnLeft.clicked.connect(self.select_leg) def select_leg(): pass

  Again while similar they are not the same. I have never had to add a Slot decorator to a function associated with a connect to a predefined object that uses event signals in fact doing so has always caused an error but I have always had to use the Slot decorator when it is associated with a custom in my code defined signal. You can either accept that or continue to struggle with trying to add that @Slot decorator to your function. Of course I am no Guru when it comes to PyQt by any measure (and have never used PySide2) but so far I have seen nothing that contradicts what I have just shown you. If you do find something let me know and I will take a look. Just keep in mind their documentation is not always spot on.

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  UNSOLVED Sender always is null(Invalid Signal signature: textMessageReceived(str))
  • tham

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  Okay removing @Slot() means you are not using Signal/Slots and will be making a direct function call. The question I pose is what are you trying to implement with your version of this as I realize this is just an MRE of problem you are experiencing.

  As a reference without seeing the rest I am going to guess you might be confusing things. Sockets are different than Signal/Slots as Sockets are mainly for internet communication and Signal/Slots are for internal code communication mainly between Threads. So are you attempting internet communication or internal (to the application) code communication?

  If the latter then I can help you sort out how to properly use Signal/Slots if the former I will have to pass as I have not delved into Sockets yet.

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  SOLVED Why does instantiating QPixmap in a second thread block/slow main?
  • nobru

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  Okay in order to speed things up you are now going to have to enter the land of multiprocessing which will mean not only learning and understanding multiprocessing but how to use QThreads to facilitate communication between your two processes. After you have dug into multiprocessing and how to implement it and have a basic understanding post another question with any questions you have on that and I will help you with any issues you might be having -- just finished going through that pain myself and finally have 2 Processes, 6 Threads, and 2 Pipes function properly and that is just for one application.

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  SOLVED How to show a Tab (QWidget object) embedded in a QtWidget on button click?
  qt for python • • Famien

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  With your description I would strongly suggest then doing away with the Tabs all together and use a Stackable Widget basically think an array of views or turning your tabs into an array and only showing the contents of the tab rather than showing the tab at all. If you need help on how to change this into a stackable widget just ask but give it a try first you will learn more from trying it than you will from being spoon fed ;)

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  UNSOLVED How to make QTreeView/QListView display specific folders?
  • Jackkkkk

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  You right a function like the following:

  def SetContent(self, tmpItmList): self.model.setRowCount(0) idx = 0 for Item in tmpItmList: # Required to avoid getting a duplicate data insert message idx += 1 blnkVal = QStandardItem(str(idx)) ItmNam = QStandardItem(Item['ItemName']) ItmNam.setTextAlignment(Qt.AlignLeft) ItmNam.isEditable = False ItmVal = QStandardItem(Item['Value']) ItmVal.setTextAlignment(Qt.AlignCenter) ItmUnt = QStandardItem((Item['Units'])) ItmUnt.setTextAlignment(Qt.AlignLeft) ItmUnt.isEditable = False self.model.appendRow([blnkVal, ItmNam, ItmVal, ItmUnt])

  The above is a method within my QTreeView class that I use for the ListView on the right side -- your version would be dependent on how you ended up storing your data further the left QTreeView would have parents and children so that would have to be coded differently. I have a version of that as well but could not find it quickly and figured with this you ought to be able to figure out how to implement the parent/child version of QTreeView by referencing the documentation and perhaps other posted examples out on the web as that was how I figured it out.

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  UNSOLVED Snippets for Python
  • alaabarazi

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  You want to run "Python-Code" in Qt?
  Did I understand this correctly ?

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  UNSOLVED QWebEngine and Proprietary Codecs
  • WeedMan

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  UNSOLVED Don't work look-and-feel
  • WeedMan

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  I have Qt/PyQt 5.11 installed from repositories. I run QFileDiaolg from pure Qt app and PyQt5 and now looks as it should
  I guess if Qt build for your system then should not be problem, else may be roughness with looks and fills (post above)

  Qt app from example:
  
  PyQt5 app:
  

  Maybe there is still some way to give the program the current system style or is it set only at compile time Qt for OS?

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  UNSOLVED Change Default Python Interpreter
  • alaabarazi

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  SOLVED Adjusting the height of rows in QTableView
  • 3beezer

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  Apparently, one needs to explicitly request a resize, e.g., with view.resizeColumnToContents(0) after the setItemDelegatestatement. It seems to me that the delegate would be invoked when sizing the view initially, but evidently this expectation is wrong.

  Also, it appears that __getattr__ does not work in PySide2.

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  UNSOLVED Qt Virtual Keyboard bug in Lubuntu
  • peaceblackhair

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  UNSOLVED Pycharm and Eclipse on windows don't show error information for PyQt5
  • behruz montazeri

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  UNSOLVED creating an .bmp file
  • AJ_111

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  where do you link your painter to the image? I see rectangle bounds checking of img, but nothing making the painter paint into the image itself.

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  UNSOLVED How to customize QSortFilterProxyModel to display specific folders?
  • Jackkkkk

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  @daljit97
  Qt.DisplayRole result:
  DISK NAME (F:)
  DISK NAME (C:)
  DISK NAME (D:)
  DISK NAME (F:)
  ...

  QFileSystemModel.FileNameRole result (no disk name):
  F:
  C:
  D:
  F:
  ...

  the result shows a list of all disks (which is the top level of the file system), indicating QSortFilterProxyModel.filterAcceptsRow() used an invalid index. look at the last test in my code.

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  UNSOLVED Problem with For "str" in str["str"]
  • Tarik EL JABIRI

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  @tarik-el-jabiri here is a non-coded rendition of a method to deal with this issue -- it might not be the best and then again it might just be -- it is basically I would at least initially handle this situation.

  First I would convert myList into myDict arranged as follows:

  Key = 'LOT_1' Value = 'T49359/22'

  or in Dictionary nomenclature

  {'LOT_1':'T49359/22' ... }

  Next instead of working with the raw Folder Names run them through a preprocessor so that you can apply your business rules to that folder (aka business rules such as LOT_1 <> LOT_10, etc...)

  Then Pass the foldername into your preprocessor routine and have that routine return a Key:Value where:

  Key = 'LOT_???' Value = 'Full_Folder_Path_Name'

  Then you can do something as easy as

  for FolderKey in ReturnedValue: if FolderKey in myDict.keys(): FolderValue = ReturnedValue[FolderKey] Now you have the two values you are looking for already separated

  As for the Preprocessor Routine you are going to have to basically search for 'LOT_' and then because your number can be up to 3 digits grab the next 3 characters and determine what number you actually have discarding anything that is not a number. Numerous ways to do this for instance you could try to convert each character to a number and add them together such as:

  if isnumeric(String[0]): digit = int(String[0] if isnumeric(String[1]): digit = (digit * 10) + int(String[1] if isnumeric(String[2]): digit = (digit * 10) + int(String[2] NewValue = 'LOT_' + str(digit)

  I nested these because if you run into a non-integer followed by an integer you do not get the wrong end result

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  UNSOLVED Object Handles across QThread Boundaries
  • Denni 0

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  Right but if Thread Safety is the only concerns then certain direct simplistic calls that get in adjust a flag and immediately get out ought not to create any issues especially if those kind of calls are mono-directional coming from one source and going to one destination with no cross-overs to any other threads basically in format I have a Main-Thread that talks to two child threads and these child-threads talk only to the Main-Thread sometimes setting certain flags and/or values is more easily done via a direct call while passing the more complex data is done via signal/slots --- and I want to be sure that doing this would not cause any hidden issues when it comes to how Threads work. I actually understand the under working mechanisms that might have been applied to threading (having actually written something like this in the past) but I am just not sure what methodology they implemented in doing this exactly.

  As for your RTFC -- sure I could -- like the masses -- not question how things work but frankly that is not my style and never has been -- and I have a lot of bugs in code because of my approach so I think I will keep it and not go with the rest of the lemmings as they plummet over that cliff ;) -- secondly I do not have the time to dig into the actual complete functionality of that code otherwise I probably would and I am just trying to find out if anyone else has already invented that wheel so I do not have to repeat making it. Its kind of like making modular code, I make it that way so I do not have to repeat making it for another project that needs something similar.

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  UNSOLVED Left sidebar like category
  • Emrecp

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  Solved with QListWidget
  self.listWidget = QtWidgets.QListWidget(self.tab_5)
  self.listWidget.setGeometry(QtCore.QRect(10, 90, 171, 211))
  self.listWidget.setStyleSheet("QListWidget {background-color: #363636}\n"
  "\n"
  "QListWidget::item {\n"
  "background-color: rgb(54, 54, 54);\n"
  "height: 40px;\n"
  "color: white;\n"
  "padding-left:15px;\n"
  "}\n"
  "\n"
  "QListWidget::item:hover {\n"
  "background-color: rgb(255, 255, 255);\n"
  "height: 40px;\n"
  "color: #363636;\n"
  "padding-left:15px;}")
  self.listWidget.setFrameShape(QtWidgets.QFrame.NoFrame)
  self.listWidget.setObjectName("listWidget")

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  UNSOLVED How do I addApplicationFont() in MacOS? Font is in Python script folder...
  • chmedlymedly

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  @daljit97

  Aha, the path is the issue.
  So, I find that using daljit97's approach does allow the font to be loaded in MacOS. But it fails on Linux. :( This means I need to parse this according to platform.

  fontbase = QtGui.QFontDatabase() test = fontbase.addApplicationFont(os.path.dirname(__file__) + "/MySillyFont.ttf") font = QtGui.QFont("MySillyFont", 12) app.setFont(font)

  And, on MacOS I'm able to load the font at start but the font dialog box does not show it. I'm still missing something simple here. It's not clear to me... How should my fontDialog know about the database I created? For that matter, how does the app know about the database at the very beginning? It somehow finds the font in the above code but doesn't find the font in my Fonty function.

  def Fonty(): ok, font = QtWidgets.QFontDialog.getFont() print(f"font selected is {font}") if ok: app.setFont(font)
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  UNSOLVED PyQt5 How to get data from current row of QTableView
  • behruz montazeri

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  @denni-0

  index = self.tableView.currentIndex() NewIndex = self.tableView.model().index(index.row(), 0)

  I must write index.row() with parenthesis.
  Now it works.Thanks

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  UNSOLVED QPyDesignerCustomWidgetPlugin trouble with propertyEditor
  • dzukenukem

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  You need to provide a MRE (Minimal Reproducible Example). What you have provided cannot be copy/pasted and ran which means anyone trying to figure out your issue is going to have to create code of their own which may not match what you are doing thus they may not get the issue you are having. Do yourself a favor and provide an MRE so that someone can answer your question quicker and more accurately

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  SOLVED Qt for Python - closed-source application as single executable?
  • ALIENQuake

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  @kent-dorfman said in Qt for Python - closed-source application as single executable?:

  @alienquake you inferred static linking where there is one executable (all dll/files inside). that would be verboten under LGPL.

  Static linking is not forbidden under LGPL. If the app uses statically linked LGPL library, all you have to do is provide your object files and the LGPL requirement is still satisfied. Or use Dynamic-Link Library Redirection feature. It's written inside LGPL FAQ: https://www.gnu.org/licenses/gpl-faq.en.html#LGPLStaticVsDynamic

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  UNSOLVED How do I update button when a string is printed?
  • sdf1444

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  Well then you set it? Basically right after your

  print("Hello World! Im a laser")

  you would want to put the following:

  self.Button.setText('On')
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  SOLVED Problems with NULL values from mySQL
  • Johnny78

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  Thank you Denni for your answer. I can see why this is a good idea, but it is a bit above my knowledge and requirements. The database server is on my own computer and the program is written purely for my use. I have decided to rename NULL values in the database. I have set new default values. Of course this is not portable at all but it is a quick fix and solves my problems.
  Maybe once I have more time and more knowledge I will try to implement your idea. Thanks for taking the time for your answer. I will mark this thread as solved.

• 

  This topic is deleted!
  • behruz montazeri

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  UNSOLVED Threads in Python and Qt
  • iamMHZ

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  UNSOLVED Text selection in model-view implementation
  • iLLiCiT

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  It required to much research on my part to pursue in the format that it was given and it is not something that I need to do for anything I am working on.

  So you would either need to present it as an MRE (Minimal Reproducible Example) showing how the QLabel works and how that does not work in the QTreeView -- then I can look at that code and determine more easily what it is you are striving to do without having to spend a lot of my time discerning that just to answer your question. Aka you need to do the work to get your question answered not the other way around.

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  UNSOLVED PyQt3D and Pyinstaller
  • XenoneX

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  @xenonex said in PyQt3D and Pyinstaller:

  PyQt5.Qt3DInput

  Very sorry, but it seems, that I just needed to pass --hidden-import PyQt5.Qt3DInput to PyInstaller.
  But still, I've got this:

  Qt3D.Renderer.Jobs: unsupported format encountered (stl)

  When I'm running my application in PyCharm everething is OK.
  Maybe anyone can help with this?

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  UNSOLVED What's the blank size of QWebEngine(View)?
  • wannabecoder

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  I cannot answer your question straight up but I would point out that python is platform independent which means a lot of extra baggage that you would not get in say straight C. On the flip-side you do not have to compile the program for every platform you want to run it on either. This is also to say that perhaps 2500 lines to 90 lines is rather insignificant to the rest of the code you need to be platform independent thus you do not see much of a difference. You want its base size (or fairly close) then compile the smallest program you can make maybe 5 - 10 lines and include the bare minimum of modules and see what you get.

  However another question comes to mind does the size of the program make that big of difference? Or is this just more of a curiosity question?

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  UNSOLVED How to declare enums in Python and expose to QML?
  • daljit97

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  SOLVED PyQt5: Very slow QSortFilterProxyModel(not customized)
  • Rhdr

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  Yes that is generally the trade off -- if you want more speed on the client you have to use more memory (which btw is fairly cheap these days or so they tell me) -- however if you want to use less memory it generally means the program will run slower -- and this trade off has been around for ages ... where it used to be memory was in short supply so speed suffered but now we can speed things up dramatically by just using more memory -- note there were programming tricks and back-flips you could perform in order to speed up code when memory was tight but most of these rather complex methodologies have given way to simply throwing more memory at it. So good luck and always K.I.S.S. it (Keep It Simple and Smart)

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  SOLVED Qt for Python crashes accessing QObject::property
  python qt for python pyside2 • • daljit97

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  @daljit97 that is awesome -- but to reiterate for future questions you might have - including an MRE (Minimal Reproducible Example) which means one can simply copy/paste the MRE and run it to get the same results greatly speeds up getting an answer. If you include an MRE that will not run because it has elements removed that are still referenced that is not technically an MRE because it does not reproduce what you are experiencing.