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Displaying real-time data on a 2nd window

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #31

    I may sound harsh but: proper architecture.

    I would suggest to start with something really minimal to just learn to use signals and slots properly, how to manage multiple different complex widgets that are only linked together by signals and slots.

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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    2
    • J Offline
      J Offline
      john_hobbyist
      wrote on last edited by
      #32

      I am trying! How can I call a method before declaring it?

      1 Reply Last reply
      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #33

        You just don't.

        As I already suggested: start with Qt's basics.

        • Single widget with signals and slots within it.
        • Second widget completely unrelated to the first one
        • Connect them only after they both properly work independently
        • While doing that: write unit tests

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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        • J Offline
          J Offline
          john_hobbyist
          wrote on last edited by
          #34

          @SGaist Thank you, I will try it.

          Please tell me a reason that the code runs commands such as open/make a widget + QLinedit + QLabels (I checked it with print commands) but I see only the widget (window) and nothing inside... What is wrong?

          jsulmJ 1 Reply Last reply
          0
          • J john_hobbyist

            @SGaist Thank you, I will try it.

            Please tell me a reason that the code runs commands such as open/make a widget + QLinedit + QLabels (I checked it with print commands) but I see only the widget (window) and nothing inside... What is wrong?

            jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #35

            @john_hobbyist said in Displaying real-time data on a 2nd window:

            What is wrong?

            Please show the code, else only guessing is possible!
            Did you add these widgets to your container widget (main window or whatever)?

            https://forum.qt.io/topic/113070/qt-code-of-conduct

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            1
            • J Offline
              J Offline
              john_hobbyist
              wrote on last edited by
              #36

              I am trying to embed a grid layout to the right side of the mainwidget. Imagine that I have divided the mainwidget area into 2 areas, left and side. I get this error though:

              File "code.py", line 1643, in __init__
                mylayout.addWidget(self.imageviewer, 1, 1)
              TypeError: addWidget(self, QWidget, stretch: int = 0, alignment: Union[Qt.Alignment, Qt.AlignmentFlag] = Qt.Alignment()): argument 3 has unexpected type 'int'
              

              What did I do wrong?

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              0
              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #37

                Are you sure mylayout is a QGridLayout ?

                Interested in AI ? www.idiap.ch
                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                • J Offline
                  J Offline
                  john_hobbyist
                  wrote on last edited by john_hobbyist
                  #38

                  I have it like this:

                  mylayout = QHBoxLayout()
                  
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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #39

                    So since it's a QHBoxLayout, why are you trying to use it like a grid layout ?

                    The error message tells you exactly the problem you have. If you read the method documentation, you'll see that the second parameter shall be a value from the Alignment enum.

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                    • J Offline
                      J Offline
                      john_hobbyist
                      wrote on last edited by
                      #40
                      This post is deleted!
                      JonBJ 1 Reply Last reply
                      0
                      • J john_hobbyist

                        This post is deleted!

                        JonBJ Offline
                        JonBJ Offline
                        JonB
                        wrote on last edited by JonB
                        #41

                        @john_hobbyist said in Displaying real-time data on a 2nd window:

                        mylayout.addWidget(self.imageviewer, 1, 1)

                        You're not reading @SGaist's replies and understanding/acting on them. Anyway, what do you intend this line to do?

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                        1
                        • J Offline
                          J Offline
                          john_hobbyist
                          wrote on last edited by
                          #42

                          @SGaist @JonB: You are right!!!! Thanks!

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                          0
                          • J Offline
                            J Offline
                            john_hobbyist
                            wrote on last edited by john_hobbyist
                            #43

                            I call the above class each time the mouse pointer changes position. The problem is that nothing is shown..but the print commands that I have embed between the below commands work!
                            Why?
                            I call it like this:

                            w = Town()
                            w.show()
                            

                            This is the class that I call

                            class Town(QWidget):
                                def __init__(self):
                                    super().__init__()
                                    import sys
                                    from PyQt5.QtWidgets import QWidget,QPushButton,QApplication,QListWidget,QGridLayout,QLabel
                                    from PyQt5.QtCore import QTimer,QDateTime
                                    from PyQt5 import QtWidgets
                                    from PyQt5.QtWidgets import QApplication, QMainWindow
                                    from PyQt5 import QtCore
                                    
                                    win = QWidget()
                                    grid=QGridLayout()
                                   
                                    import pandas
                                    ct = pandas.read_csv('CurrentTown.csv')
                                    town = QLabel("town:")
                                    town.setStyleSheet("border: 1px solid black; background-color: yellow")  
                                    grid.addWidget(town, 1,1)
                                    textEdit_1 = QLineEdit(ct)
                                    textEdit_1.setReadOnly(True)
                                    grid.addWidget(textEdit_1,1,2)
                            
                                    
                                    import os
                                    os.remove('CurrentTown.csv')
                                
                                    self.setLayout(grid)
                                    win.setGeometry(100,100,200,100)
                                    win.setWindowTitle("Test")
                                    win.show()
                                    win.update()
                            jsulmJ 1 Reply Last reply
                            0
                            • J john_hobbyist

                              I call the above class each time the mouse pointer changes position. The problem is that nothing is shown..but the print commands that I have embed between the below commands work!
                              Why?
                              I call it like this:

                              w = Town()
                              w.show()
                              

                              This is the class that I call

                              class Town(QWidget):
                                  def __init__(self):
                                      super().__init__()
                                      import sys
                                      from PyQt5.QtWidgets import QWidget,QPushButton,QApplication,QListWidget,QGridLayout,QLabel
                                      from PyQt5.QtCore import QTimer,QDateTime
                                      from PyQt5 import QtWidgets
                                      from PyQt5.QtWidgets import QApplication, QMainWindow
                                      from PyQt5 import QtCore
                                      
                                      win = QWidget()
                                      grid=QGridLayout()
                                     
                                      import pandas
                                      ct = pandas.read_csv('CurrentTown.csv')
                                      town = QLabel("town:")
                                      town.setStyleSheet("border: 1px solid black; background-color: yellow")  
                                      grid.addWidget(town, 1,1)
                                      textEdit_1 = QLineEdit(ct)
                                      textEdit_1.setReadOnly(True)
                                      grid.addWidget(textEdit_1,1,2)
                              
                                      
                                      import os
                                      os.remove('CurrentTown.csv')
                                  
                                      self.setLayout(grid)
                                      win.setGeometry(100,100,200,100)
                                      win.setWindowTitle("Test")
                                      win.show()
                                      win.update()
                              jsulmJ Offline
                              jsulmJ Offline
                              jsulm
                              Lifetime Qt Champion
                              wrote on last edited by
                              #44

                              @john_hobbyist said in Displaying real-time data on a 2nd window:

                              I call it like this:

                              Where?
                              Please show that part of your code.
                              Also, why do you create a new QWidget in Town which does not contain anything? Town is already a QWidget.

                              https://forum.qt.io/topic/113070/qt-code-of-conduct

                              J 1 Reply Last reply
                              1
                              • jsulmJ jsulm

                                @john_hobbyist said in Displaying real-time data on a 2nd window:

                                I call it like this:

                                Where?
                                Please show that part of your code.
                                Also, why do you create a new QWidget in Town which does not contain anything? Town is already a QWidget.

                                J Offline
                                J Offline
                                john_hobbyist
                                wrote on last edited by john_hobbyist
                                #45

                                @jsulm said in Displaying real-time data on a 2nd window:

                                @john_hobbyist said in Displaying real-time data on a 2nd window:

                                I call it like this:

                                Where?
                                Please show that part of your code.
                                Also, why do you create a new QWidget in Town which does not contain anything? Town is already a QWidget.

                                You mean this (?) :

                                win = QWidget()
                                . . . 
                                win.setGeometry(100,100,200,100)
                                win.setWindowTitle("Test")
                                win.show()
                                win.update()
                                

                                So, class Town(QWidget): makes a widget before the previous code...(?)

                                jsulmJ 1 Reply Last reply
                                0
                                • J john_hobbyist

                                  @jsulm said in Displaying real-time data on a 2nd window:

                                  @john_hobbyist said in Displaying real-time data on a 2nd window:

                                  I call it like this:

                                  Where?
                                  Please show that part of your code.
                                  Also, why do you create a new QWidget in Town which does not contain anything? Town is already a QWidget.

                                  You mean this (?) :

                                  win = QWidget()
                                  . . . 
                                  win.setGeometry(100,100,200,100)
                                  win.setWindowTitle("Test")
                                  win.show()
                                  win.update()
                                  

                                  So, class Town(QWidget): makes a widget before the previous code...(?)

                                  jsulmJ Offline
                                  jsulmJ Offline
                                  jsulm
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #46

                                  @john_hobbyist said in Displaying real-time data on a 2nd window:

                                  You mean this

                                  Yes. Why do you need win?
                                  All other widgets you create in Town are added to Town.

                                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                                  J 1 Reply Last reply
                                  1
                                  • jsulmJ jsulm

                                    @john_hobbyist said in Displaying real-time data on a 2nd window:

                                    You mean this

                                    Yes. Why do you need win?
                                    All other widgets you create in Town are added to Town.

                                    J Offline
                                    J Offline
                                    john_hobbyist
                                    wrote on last edited by
                                    #47

                                    @jsulm said in Displaying real-time data on a 2nd window:

                                    @john_hobbyist said in Displaying real-time data on a 2nd window:

                                    You mean this

                                    Yes. Why do you need win?
                                    All other widgets you create in Town are added to Town.

                                    And what I do with these?

                                    win.setGeometry(100,100,200,100)
                                    win.setWindowTitle("Test")
                                    win.show()
                                    win.update()
                                    

                                    I call them with self???

                                    jsulmJ 1 Reply Last reply
                                    0
                                    • J john_hobbyist

                                      @jsulm said in Displaying real-time data on a 2nd window:

                                      @john_hobbyist said in Displaying real-time data on a 2nd window:

                                      You mean this

                                      Yes. Why do you need win?
                                      All other widgets you create in Town are added to Town.

                                      And what I do with these?

                                      win.setGeometry(100,100,200,100)
                                      win.setWindowTitle("Test")
                                      win.show()
                                      win.update()
                                      

                                      I call them with self???

                                      jsulmJ Offline
                                      jsulmJ Offline
                                      jsulm
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #48

                                      @john_hobbyist said in Displaying real-time data on a 2nd window:

                                      And what I do with these?

                                      I don't know what you want to do with this.
                                      You simply create a widget without parent and show it - it will be a stand-alone WINDOW.

                                      "I call them with self???" - what does this mean? If you're asking me how you should change it: then I repeat my question "Why do you need it at all"?! Can you first answer this question?

                                      https://forum.qt.io/topic/113070/qt-code-of-conduct

                                      1 Reply Last reply
                                      1
                                      • J Offline
                                        J Offline
                                        john_hobbyist
                                        wrote on last edited by john_hobbyist
                                        #49

                                        I call the class (from another class) like this:

                                        w = Town()
                                        w.show()
                                        

                                        how could the Qwidget be displayed if I do not include these (?) :

                                        win.setGeometry(100,100,200,100)
                                        win.setWindowTitle("Test")
                                        win.show()
                                        win.update()
                                        

                                        Especially win.show

                                        Update: I removed the above mentioned lines. I put a sleep method for 10 sec. The code opens a window but it does not have something inside...and looks like it "stucks".

                                        jsulmJ 1 Reply Last reply
                                        0
                                        • J john_hobbyist

                                          I call the class (from another class) like this:

                                          w = Town()
                                          w.show()
                                          

                                          how could the Qwidget be displayed if I do not include these (?) :

                                          win.setGeometry(100,100,200,100)
                                          win.setWindowTitle("Test")
                                          win.show()
                                          win.update()
                                          

                                          Especially win.show

                                          Update: I removed the above mentioned lines. I put a sleep method for 10 sec. The code opens a window but it does not have something inside...and looks like it "stucks".

                                          jsulmJ Offline
                                          jsulmJ Offline
                                          jsulm
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #50

                                          @john_hobbyist I really have no idea what you want to do!
                                          If you want to show Town all you need is

                                          w = Town()
                                          w.show()
                                          

                                          So, once more: why do you need win? win is ANOTHER widget, it is not Town! If you refuse to answer this simple question I'm out of this thread.
                                          "but it does not have something inside...and looks like it "stucks"." - this is also something I already told you: you are showing a widget (win) which has no parent, so it is shown as a window. And since win does not contain any other widgets it is an empty window.

                                          https://forum.qt.io/topic/113070/qt-code-of-conduct

                                          J 1 Reply Last reply
                                          1

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