PySide2 Spacebar press

[Caeden]

When I press the spacebar it doesnt capture it in my

def keyPressEvent(self, event) -> None:

as in, it just doesn't trigger it. How can I make it trigger it? There isn't much documentation online

[SGaist]

Hi,

Which class ?
Does it have the focus ?
How did you implement it ?
On which OS ?
Which version of PySide2 ?

[Caeden]

@SGaist

1. class MainWindow(QWidget):
2. def keyPressEvent(self, event) -> None: inside of MainWindow (subclass)
3. Linux
4. 5.15.2

Also, for some weird reason with the code im using Spacebar press is counted as a 7...? Doesn't trigger keyPressEvent at all though, I printed hi after and the print didnt trigger... curious

[SGaist]

Please show your code.

[Caeden]

@SGaist It's very messy, so excuse the code

import sys, os, time
import simpleeval as simple

from calc_ui import Ui_Dialog
from functools import partial

from PySide2.QtWidgets import *
from PySide2 import *
from PySide2.QtTest import QTest

superscript = {
    '1': '¹',
    '2': '²',
    '3': '³',
    '4': '⁴',
    '5': '⁵',
    '6': '⁶',
    '7': '⁷',
    '8': '⁸', 
    '9': '⁹',
    '0': '⁰',
}
osuperscript = {
    '¹': '1',
    '²': '2',
    '³': '3',
    '⁴': '4',
    '⁵': '5',
    '⁶': '6',
    '⁷': '7',
    '⁸': '8', 
    '⁹': '9',
    '⁰': '0',
}

class MainWindow(QWidget):
    def __init__(self) -> None:
        """Okay, unnecessary as hell"""

        super().__init__()
        self.initUi()
        self.createVars()
        self.setWindowTitle("Calculator")


    def initUi(self) -> None:
        """Ui, why is there a docstring here?"""

        self.ui = Ui_Dialog()
        self.ui.setupUi(self) 

    def createVars(self) -> None:  
        """At least try and make it look neat"""

        self._X = 1
        self._Y = 5
        self.label = self.ui.label  

        for i in [  self.ui.pushButton_9, self.ui.pushButton_10, self.ui.pushButton_11, self.ui.pushButton_12, self.ui.pushButton_13, 
                    self.ui.pushButton_14, self.ui.pushButton_15, self.ui.pushButton_16, self.ui.pushButton_17,
                    self.ui.pushButton_19, self.ui.pushButton_20, self.ui.pushButton_21, self.ui.pushButton_22, self.ui.pushButton_24,
                    self.ui.pushButton_25, self.ui.pushButton_26, self.ui.pushButton_27, self.ui.pushButton_28  ]:

            i.clicked.connect(partial(self.writeTo, i))

        self.ui.pushButton_23.clicked.connect(self.evaluate)
        self.ui.pushButton_30.clicked.connect(self.clear)
        self.ui.pushButton_18.clicked.connect(lambda: self.label.setText(self.label.text() + "'") if not self.label.text() == '0' else self.label.setText("'"))

    def keyPressEvent(self, event) -> None:
        """Key press"""

        label = self.label
        text = event.text().upper()
        key = event.key() 
        ltext = label.text().upper()

        if text.isalpha() and text not in ['X', 'Y']:
            """Alphabetical"""
            return

        if key in [96, 91, 93, 16777248, 35, 39, 59, 47, 44, 16781571, 92, 16777216]:
            """Excess keys like `,./#; """
            return 

        if key == 16777220:
            """Enter clicked"""
            return self.evaluate()

        if key == 16777219: 
            """Backspace"""
            return self.clear(label)

        if ltext == '0':
            """Nothing currently in terminal"""
            return label.setText(text) 
        
        if "'" in ltext[-1]:
            return label.setText(ltext.replace("'", "") + superscript[text])
        
        if ltext[-1] in osuperscript:
            return label.setText(ltext + superscript[text])

        """Add to label"""
        return label.setText(ltext + text)

    def evaluate(self) -> None:
        """Just returns expression, evaluated"""

        text = self.label.text()
        text = text.replace(' ', '')
        script = 0

        for iteration, character in enumerate(text):
            if character in osuperscript:
                print(iteration)
                print(text[iteration-2:-1])
                if text[iteration-2:-1]  == '**':
                    text = text.replace(character, osuperscript[character])
                    #script += 1
                    continue

                if text[iteration-1] not in osuperscript:
                    text = text.replace(character, "**" + osuperscript[character])
                    #script += 1
                    continue

                script += 1
        print('\n\n\n\n')
        print(text)
        print(script)

        expression = text
        try:
            output = simple.simple_eval(expression, names={"X": self._X, "Y": self._Y})    
            self.label.setText(str(output))

        except Exception:
            self.label.setText('Error: Too high number output')

    def writeTo(self, func) -> None:
        """Because I am lazy and I like neat code"""
        self.label.setText(self.label.text() + func.text()) if not self.label.text() == '0' else self.label.setText(func.text())

    def clear(self, label) -> None:
        if len(label.text()) == 1:
            """Add a 0"""
            return label.setText('0')
        return label.setText(label.text()[:-1]) 

            




if __name__ == "__main__":
    app = QApplication(sys.argv)
    win = MainWindow()
    win.show()
    app.exec_()
    sys.exit(0)

[SGaist]

Why not use the Qt::Key enum ?

[Caeden]

@SGaist Hey, sorry, I've been trying to research how to use it but I don't completely understand - How would I use an enum in this case?

[SGaist]

if key in [Qt.Key_0, Qt.Key_1]:
    print("smothering")

[Caeden]

@SGaist but where? I would need an event for this, seeing as the keyboardpress event doesnt trigger from it

[jsulm]

@Caeden https://doc.qt.io/qt-5/qkeyevent.html#key

[Caeden]

@jsulm When I print(dir(MainWindow)) there is no QEventKey

[jsulm]

@Caeden The event is right here: def keyPressEvent(self, event)

[Caeden]

@jsulm Yes, but the event isn't triggered when I press the spacebar.

def keyPressEvent(self, event) -> None:
        """Key press"""

        print('hi')

this does not print 'hi' when I press the spacebar. Spacebar is the key i'm after and it does not trigger this event

[jsulm]

@Caeden One moment. In which exact widget do you want to enter space? Which widget has focus when you press space? MainWindow is a container widget containing other widgets, right?

[Caeden]

@jsulm I just want it to accept a spacebar press. Here is my ui code, its automatically generated so doesnt look amazingly neat
I believe that I have one QWidget on my main window, because on linux for some reason background-color: black; makes it appear black on Qt Designer, but shows as a white background. It worked fine on windows before, but anyway, thats irrelevant because I'm just using a widget instead

from PySide2.QtCore import *
from PySide2.QtGui import *
from PySide2.QtWidgets import *

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.resize(580, 607)
        Dialog.setStyleSheet(u"")
        self.widget = QWidget(Dialog)
        Dialog.setWindowTitle('Calculator')
        self.widget.setObjectName(u"widget")
        self.widget.setGeometry(QRect(0, 0, 581, 611))
        self.widget.setStyleSheet(u"background-color: black;")
        self.label = QLabel(self.widget)
        self.label.setObjectName(u"label")
        self.label.setMargin(10)
        self.label.setGeometry(QRect(9, 10, 561, 121))
        font = QFont()
        font.setPointSize(20)
        self.label.setFont(font)
        self.label.setStyleSheet(u"border: 2px solid rgb(166, 166, 166);\n"
"border-radius: 10px;\n"
"color: white;")
        self.pushButton_9 = QPushButton(self.widget)
        self.pushButton_9.setObjectName(u"pushButton_9")
        self.pushButton_9.setGeometry(QRect(20, 320, 111, 51))
        self.pushButton_9.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_9.setAutoDefault(False)
        self.pushButton_10 = QPushButton(self.widget)
        self.pushButton_10.setObjectName(u"pushButton_10")
        self.pushButton_10.setGeometry(QRect(160, 320, 111, 51))
        self.pushButton_10.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_10.setAutoDefault(False)
        self.pushButton_11 = QPushButton(self.widget)
        self.pushButton_11.setObjectName(u"pushButton_11")
        self.pushButton_11.setGeometry(QRect(300, 320, 111, 51))
        self.pushButton_11.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_11.setAutoDefault(False)
        self.pushButton_12 = QPushButton(self.widget)
        self.pushButton_12.setObjectName(u"pushButton_12")
        self.pushButton_12.setGeometry(QRect(300, 460, 111, 51))
        self.pushButton_12.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_12.setAutoDefault(False)
        self.pushButton_13 = QPushButton(self.widget)
        self.pushButton_13.setObjectName(u"pushButton_13")
        self.pushButton_13.setGeometry(QRect(160, 460, 111, 51))
        self.pushButton_13.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_13.setAutoDefault(False)
        self.pushButton_14 = QPushButton(self.widget)
        self.pushButton_14.setObjectName(u"pushButton_14")
        self.pushButton_14.setGeometry(QRect(20, 460, 111, 51))
        self.pushButton_14.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_14.setAutoDefault(False)
        self.pushButton_15 = QPushButton(self.widget)
        self.pushButton_15.setObjectName(u"pushButton_15")
        self.pushButton_15.setGeometry(QRect(300, 390, 111, 51))
        self.pushButton_15.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_15.setAutoDefault(False)
        self.pushButton_16 = QPushButton(self.widget)
        self.pushButton_16.setObjectName(u"pushButton_16")
        self.pushButton_16.setGeometry(QRect(160, 390, 111, 51))
        self.pushButton_16.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_16.setAutoDefault(False)
        self.pushButton_17 = QPushButton(self.widget)
        self.pushButton_17.setObjectName(u"pushButton_17")
        self.pushButton_17.setGeometry(QRect(20, 390, 111, 51))
        self.pushButton_17.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_17.setAutoDefault(False)
        self.pushButton_18 = QPushButton(self.widget)
        self.pushButton_18.setObjectName(u"pushButton_18")
        self.pushButton_18.setGeometry(QRect(300, 240, 111, 51))
        self.pushButton_18.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_18.setAutoDefault(False)
        self.pushButton_19 = QPushButton(self.widget)
        self.pushButton_19.setObjectName(u"pushButton_19")
        self.pushButton_19.setGeometry(QRect(160, 240, 111, 51))
        self.pushButton_19.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_19.setAutoDefault(False)
        self.pushButton_20 = QPushButton(self.widget)
        self.pushButton_20.setObjectName(u"pushButton_20")
        self.pushButton_20.setGeometry(QRect(20, 240, 111, 51))
        self.pushButton_20.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_20.setAutoDefault(False)
        self.pushButton_21 = QPushButton(self.widget)
        self.pushButton_21.setObjectName(u"pushButton_21")
        self.pushButton_21.setGeometry(QRect(20, 540, 111, 51))
        self.pushButton_21.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_21.setAutoDefault(False)
        self.pushButton_22 = QPushButton(self.widget)
        self.pushButton_22.setObjectName(u"pushButton_22")
        self.pushButton_22.setGeometry(QRect(160, 540, 111, 51))
        self.pushButton_22.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_22.setAutoDefault(False)
        self.pushButton_23 = QPushButton(self.widget)
        self.pushButton_23.setObjectName(u"pushButton_23")
        self.pushButton_23.setGeometry(QRect(300, 540, 111, 51))
        self.pushButton_23.setStyleSheet(u"background-color: black;\n"
"color: white;\n"
"border:  4px solid rgb(112, 112, 112);\n"
"border-radius: 4px;")
        self.pushButton_23.setAutoDefault(False)
        self.pushButton_24 = QPushButton(self.widget)
        self.pushButton_24.setObjectName(u"pushButton_24")
        self.pushButton_24.setGeometry(QRect(450, 240, 111, 51))
        self.pushButton_24.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_24.setAutoDefault(False)
        self.pushButton_25 = QPushButton(self.widget)
        self.pushButton_25.setObjectName(u"pushButton_25")
        self.pushButton_25.setGeometry(QRect(450, 320, 111, 51))
        self.pushButton_25.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_25.setAutoDefault(False)
        self.pushButton_26 = QPushButton(self.widget)
        self.pushButton_26.setObjectName(u"pushButton_26")
        self.pushButton_26.setGeometry(QRect(450, 390, 111, 51))
        self.pushButton_26.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_26.setAutoDefault(False)
        self.pushButton_27 = QPushButton(self.widget)
        self.pushButton_27.setObjectName(u"pushButton_27")
        self.pushButton_27.setGeometry(QRect(450, 460, 111, 51))
        self.pushButton_27.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_27.setAutoDefault(False)
        self.pushButton_28 = QPushButton(self.widget)
        self.pushButton_28.setObjectName(u"pushButton_28")
        self.pushButton_28.setGeometry(QRect(450, 540, 111, 51))
        self.pushButton_28.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_28.setAutoDefault(False)
        self.pushButton_29 = QPushButton(self.widget)
        self.pushButton_29.setObjectName(u"pushButton_29")
        self.pushButton_29.setGeometry(QRect(450, 160, 111, 51))
        self.pushButton_29.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_29.setAutoDefault(False)
        self.pushButton_30 = QPushButton(self.widget)
        self.pushButton_30.setObjectName(u"pushButton_30")
        self.pushButton_30.setGeometry(QRect(300, 160, 111, 51))
        self.pushButton_30.setStyleSheet(u"""

background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;


""")
        self.pushButton_30.setAutoDefault(False)
        self.pushButton_31 = QPushButton(self.widget)
        self.pushButton_31.setObjectName(u"pushButton_31")
        self.pushButton_31.setGeometry(QRect(160, 160, 111, 51))
        self.pushButton_31.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_31.setAutoDefault(False)
        self.pushButton_32 = QPushButton(self.widget)
        self.pushButton_32.setObjectName(u"pushButton_32")
        self.pushButton_32.setGeometry(QRect(20, 160, 111, 51))
        self.pushButton_32.setStyleSheet(u"""
background-color: black;
color: white;
border:  2px solid rgb(166, 166, 166);
border-radius: 4px;

""")
        self.pushButton_32.setAutoDefault(False)

        self.retranslateUi(Dialog)

        QMetaObject.connectSlotsByName(Dialog)
    # setupUi

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QCoreApplication.translate("Dialog", u"Dialog", None))
        self.label.setText(QCoreApplication.translate("Dialog", u"0", None))
        self.pushButton_9.setText(QCoreApplication.translate("Dialog", u"7", None))
        self.pushButton_10.setText(QCoreApplication.translate("Dialog", u"8", None))
        self.pushButton_11.setText(QCoreApplication.translate("Dialog", u"9", None))
        self.pushButton_12.setText(QCoreApplication.translate("Dialog", u"3", None))
        self.pushButton_13.setText(QCoreApplication.translate("Dialog", u"2", None))
        self.pushButton_14.setText(QCoreApplication.translate("Dialog", u"1", None))
        self.pushButton_15.setText(QCoreApplication.translate("Dialog", u"6", None))
        self.pushButton_16.setText(QCoreApplication.translate("Dialog", u"5", None))
        self.pushButton_17.setText(QCoreApplication.translate("Dialog", u"4", None))
        self.pushButton_18.setText(QCoreApplication.translate("Dialog", u"\u00b2", None))
        self.pushButton_19.setText(QCoreApplication.translate("Dialog", u")", None))
        self.pushButton_20.setText(QCoreApplication.translate("Dialog", u"(", None))
        self.pushButton_21.setText(QCoreApplication.translate("Dialog", u"0", None))
        self.pushButton_22.setText(QCoreApplication.translate("Dialog", u".", None))
        self.pushButton_23.setText(QCoreApplication.translate("Dialog", u"=", None))
        self.pushButton_24.setText(QCoreApplication.translate("Dialog", u"\u221a", None))
        self.pushButton_25.setText(QCoreApplication.translate("Dialog", u"-", None))
        self.pushButton_26.setText(QCoreApplication.translate("Dialog", u"/", None))
        self.pushButton_27.setText(QCoreApplication.translate("Dialog", u"*", None))
        self.pushButton_28.setText(QCoreApplication.translate("Dialog", u"+", None))
        self.pushButton_29.setText(QCoreApplication.translate("Dialog", u"AC", None))
        self.pushButton_30.setText(QCoreApplication.translate("Dialog", u"DEL", None))
        self.pushButton_31.setText(QCoreApplication.translate("Dialog", u"X", None))
        self.pushButton_32.setText(QCoreApplication.translate("Dialog", u"Y", None))
    # retranslateUi

[Caeden]

@jsulm When I do

 def event(self, _event):
        print('hi, {}, {}'.format(_event, self.num))
        self.num += 1

and press spacebar it seems that when I press spacebar it counts it as <PySide2.QtCore.QEvent object at 0x7f600b1b9b40>. How do I turn this into an event function?

[jsulm]

@Caeden said in PySide2 Spacebar press:

event function?

Event is not a function it is an object.

_event.key()

should do.