You can connect signal/slots out of the init().īut it is often very convenient to make a connection in that place.įor the most part, there is no chance to disconnect.And if you don't want to connect, you can block the connection by using blockSignals() method. Second, a related question, why do these signal/slots go in the init() function of the window? Does app.exec_() continuously run init()? Wouldn't it be more sensible to instantiate an object and then have an "update" function that is run in the app loop? I think you don't need to make a custom signal & slot if my answer is what you want. `signal.emit(object)` means that to emit the connected signal.īecause you have connected textActivated(signal) with tText(slot), so, if you set the currentText() for object when it is emitted, the setText catch the object.If you connect the signal to three tText, all of the lineedits set text by the same information.īefore emitting, you must make a connection except for default settings. `nnect(somthing slot)` means that make a connection between signal & slot. (I could do it activated() because my version is 5.9.x). I don't know what you want to set actually, but, textActivated() since (PyQt5.14) What I understood from your question is to set the first item on the lineedit at the first time. Simply, can you achieve your purpose by this code? Please, append 'D': 'You choose D' or other datas and try it! When you want to expand your key & value, all you have to do is to rewrite the data of dic only once.įortunately, dict can conserve the order of keys from. And if you do so, whatever you add new keys& values in the dict, the changes reflect without changing other codes. I don't know how long you expand the key & value connections, but you now set the same key & value anywhere directly.It is verbose, you may as well always get the key from one object as much as you can. MainWindow.show() # Actually show the window MainWindow = QtWidgets.QMainWindow() # create the actual window (dic)Īpp = QtWidgets.QApplication(sys.argv) # Whole application # number and value you can use enumerate func. Update from PyQt5 import QtCore, QtGui, QtWidgets tWindowTitle(_translate("MainWindow", "MainWindow")) Self.statusbar = QtWidgets.QStatusBar(MainWindow) Self.lineEdit = QtWidgets.QLineEdit(self.centralwidget) boBox = QtWidgets.QComboBox(self.centralwidget) Self.horizontalLayout = QtWidgets.QHBoxLayout(self.centralwidget) Self.centralwidget = QtWidgets.QWidget(MainWindow) Do not edit this file unless you know what you are doing.įrom PyQt5 import QtCore, QtGui, QtWidgets # WARNING: Any manual changes made to this file will be lost when pyuic5 is # Created by: PyQt5 UI code generator 5.15.0 # Form implementation generated from reading ui file 'practice.ui' Second, a related question, why do these signal/slots go in the _init_() function of the window? Does app.exec_() continuously run _init_()? Wouldn't it be more sensible to instantiate an object and then have an "update" function that is run in the app loop? connect is an instance function.ĭoes anyone know how to do this with a custom function/slot? The full code is at the bottom of this post. I know the line that I need to modify/the line responsible for the signal/slot connection is ()īut I don't really understand how I would pass in the value of the combobox when. The reason I want to do it this way is because the combo box will set a bunch of default parameters based on the input, and then the user can tweak the values if desired. A is selected then the line edit is filled in with Option 1 or something like that. What I want to do is have each entry of the combo box be a 'key' to a value, so if e.g. When an option is selected, that letter appears in the box. The problem is, when the textActivated() signal of the combo box is sent to the setText() slot of the line edit, the line edit is filled in with the text in the combo box.īelow I put a small example to show what I mean. I have a combo box with a variety of options, and what I want to do is have the choice in the box change the text in a bunch of line edit boxes. I'm hoping you can help me with a couple of questions:įirst, I've created a GUI using Qt Designer, and I've run into an issue on "wiring it up". I'm a complete beginner using Qt and at building GUIs in general, so apologies if this is a stupid question but I can't find an answer on the internet.
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