PyQt5 öffnen Event

[Julsenn]

Guten Tag,

ich versuche beim Start eines neuen Fensters eine Definition zu laden aber finde nichts dazu. Wie kann ich beim Start des Fensters automatisch die def load ansprechen ? Vielen Dank im vorraus.

    def load(self):  


        with open("Slot1.txt", "r") as f:
           file_text1 = f.readline()                 
           self.pushButton.setText(file_text1)

[jsulm]

@Julsenn Ist dieses Fenster deine eigene Classe? Wenn ja, dann kannst du https://doc.qt.io/qt-5/qwidget.html#showEvent überschreiben und dort load aufrufen.
Oder du rufst load() dort auf wo du auch das Fenster erzeugst/anzeigst.

[Julsenn]

@jsulm danke schonmal fürs antworten ich verzweifel hier :D.
Ja die class ist meine wie kann ich dann das load() event einsetzen also wo ?

class Ui_Handbetrieb(object):

 

    def load(self):   # anfangsevent erstellen !!!                                           
        with open("Slot1.txt", "r") as f:
           file_text1 = f.readline()                  #zeilenangabe hinten
           self.pushButton.setText(file_text1)

[Julsenn]

jetzt sprech ich load durch einen button an aber ich will das des automatisch ausgefrührt wird beim start ohne das ich ein button klicke.

self.Auswahlladen_btn.clicked.connect(self.load)

[mrjj]

Hi

def showEvent(self, ev):
    load(self)
    return QWidget.showEvent(self, ev)

Dies ist eine Funktion, die Qt kurz vor der Anzeige des Widgets aufruft

[JonB]

@mrjj
Yes indeed to your answer. But perhaps you should remind the OP that showEvent() will be called as the window is minimized->maximized as well as when first shown, I think, and then he wouldn't always want to re-load() that file to initialize the button? IIRC I keep a static bool first_shown state variable in the widget.

My German isn't good enough to translate the above :)

[Julsenn]

@JonB when the window open i want to call the def load(self) automatically

[JonB]

@Julsenn
I know this :) @mrjj & @jsulm are trying to tell you that you need to override the showEvent() method of your QWidget or QMainWindow (" neuen Fensters"). You will call your load() method from there.

[Julsenn]

@JonB sorry i'm still amateur. You mean here ?

if __name__ == "__main__":
    
        import sys
    
        app = QtWidgets.QApplication(sys.argv)
    
        Handbetrieb = QtWidgets.QWidget()
    
        ui = Ui_Handbetrieb()
    
        ui.setupUi(Handbetrieb)
        Handbetrieb.show()  #here is the show event ?

    
    
    
        
    
        sys.exit(app.exec_())

[JonB]

@Julsenn
I can't type it all, but you will need to change over to like:

class MeinHandbetrieb(QtWidgets.QWidget):

    def showEvent(self, ev):
        load(self)
        return QWidget.showEvent(self, ev)
...

Handbetrieb = MeinHandbetrieb()
...
Handbetrieb.show()

I know you are an amateur, but for this and other things Qt you have to understand C++ sub-classing.

[Julsenn]

ok thank you but i don't know how i implement this when i use the code always comes NameError: name 'Ui_Handbetrieb' is not defined. . :(

[Julsenn]

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):

    def save_text(self):
        with open("test.txt", "w") as f:
            text = self.eingabe_1.toPlainText()
            f.write(text)

    def open_text(self):                    #this automatically when window start
        with open("test.txt", "r") as f:
           file_text = f.readlines()[0]                 
           self.eingabe_2.setText(file_text)
    
    
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.eingabe_1 = QtWidgets.QTextEdit(self.centralwidget)
        self.eingabe_1.setGeometry(QtCore.QRect(80, 180, 301, 51))
        self.eingabe_1.setObjectName("eingabe_1")


        
        self.eingabe_2 = QtWidgets.QTextEdit(self.centralwidget)
        self.eingabe_2.setGeometry(QtCore.QRect(80, 260, 301, 51))
        self.eingabe_2.setObjectName("eingabe_2")


        
        self.speichern_btn = QtWidgets.QPushButton(self.centralwidget)
        self.speichern_btn.setGeometry(QtCore.QRect(420, 180, 121, 51))
        self.speichern_btn.setObjectName("speichern_btn")

        self.speichern_btn.clicked.connect(self.save_text)
        
        self.oeffnen_btn = QtWidgets.QPushButton(self.centralwidget)
        self.oeffnen_btn.setGeometry(QtCore.QRect(580, 180, 131, 51))
        self.oeffnen_btn.setObjectName("oeffnen_btn")

        self.oeffnen_btn.clicked.connect(self.open_text)
        
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.speichern_btn.setText(_translate("MainWindow", "Speichern"))
        self.oeffnen_btn.setText(_translate("MainWindow", "Öffnen"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

[JonB]

@Julsenn

    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    # insert the following line
    # (not the best way to do it, but simplest from where you are now)
    ui.open_text()
    MainWindow.show()

[Julsenn]

@JonB thank you so much, finally it works :D :D so easy :D

[JonB]

@Julsenn
Yes :) But it probably is not the right way of doing it.

When do you think you are going to call your save_text()? You are going to have a problem trying to do that the same way... :(

[Julsenn]

@JonB i dont want to call the save_text its just a TestWindow in my Main Projekt i dont have the save_text. Thank you.

[Julsenn]

but now when i start the window from a other window it does not work ? :(

[JonB]

@Julsenn
Don't know what you mean. You can see the code and how it works, so long as ui.open_text() is called before whatever window has the self.pushButton() is shown then the text will be read in & set. Use a debugger, or put in some print()-type statements, to see what is/is not being called at what point. That is what developing programs is all about :)

[Julsenn]

@JonB okey thanks i try