PyQt5 öffnen Event

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