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From: Hans-Peter Jansen <hpj@urpla.net>
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Subject: =?utf-8?q?=5BPython-de=5D_Re=3A_New_overriden_and_generated_QLineEdit_class_will_not?=
Date: Fri, 08 Oct 2021 18:02:03 +0200
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Am Freitag, 8. Oktober 2021, 11:14:54 CEST schrieb Mohsen Owzar:
> Hi all
> I have a question about a clickable QLineEdit.
> After searching some Hints, how to use QMouseEvent, I've written a program
> which is working almost good but with a small or perhaps big ugliness and
> that is: Below is the imgur link to the screenshots of my program after
> clicking the buttons in sequence: https://imgur.com/a/rfcP3qB

Ich sch=E4tze, wir k=F6nnen an diesem Punkt in deutsch weitermachen.

Vielleicht solltest Du erst mal versuchen, dein Problem m=F6glichst kurz zu=
=20
formulieren. Ich kann hier nur eine Ablaufbeschreibung finden.

> As you will see in the code blow,=20

Ein whitespace damaged code ist ziemlich unbrauchbar, you know..

> I override the QlineEdit widget and define
> a new class " CustomLineEdit " to generate a "clicked" signal, when the
> user pressed with mouse on this field. I use this "CustomLineEdit" class
> and place it on the MainWindow with the desired "layout". I couldn't figu=
re
> out, why this widget is placed not in the MainWindow, but outside this
> window, as you can see in the top picture of the attached screenshots.

Okay, hier sagst du, du willst dein widget im mainWindow platzieren.

Das macht man =FCblicherweise mit einer parent/child relationship. Da du ab=
er in=20
der Ableitung deiner Klasse diese *aller* Argumente beraubt hast, geht dir=
=20
damit dieser Mechanismus (parent=3D..) verloren. Vielleicht nimmst Du mal d=
ein=20
__init__() ganz raus, dann solltest Du die default Signatur zur=FCckbekomme=
n,=20
und kannst parent auch wieder setzen.

> When
> I take the line 12 (self.show()) from the code, the generated class will
> not appear. The problem here is that at the beginning, the MainWindow with
> a LineEdit field should appear at the program start. Then, after clicking
> on this field, the keypad should come up outside the MainWindow.

Hier widersprichst du dir. Aber ich glaube, ich habe dein Problem trotzdem=
=20
richtig interpretiert.

Schau mal in die PyQt Beispiele, da solltest du alle Arten von subclassing,=
=20
event handling, und so finden. Wichtig sind da noch die return codes aus de=
n=20
event handlern..

Gutes Gelingen.

Cheers,
Pete

> Could
> anyone see, where my mistake is?
> Thanks for any help.
> Mohsen
> Here is the code:
> &&&&&&&&&&&&&&&&&&&&&&&&&&&
> import sys
> from PyQt5.QtWidgets import (QApplication, QLineEdit, QPushButton,
> QMainWindow, QVBoxLayout, QHBoxLayout, QGridLayout, QWidget)
> from PyQt5.QtCore import pyqtSignal, pyqtSlot
>=20
> class CustomLineEdit(QLineEdit):
> clicked =3D pyqtSignal()
>=20
> def __init__(self):
> super().__init__()
>=20
> self.show()
>=20
> def mousePressEvent(self, QMouseEvent):
> self.clicked.emit()
>=20
>=20
> class MainWindow(QMainWindow):
> def __init__( self, parent=3DNone ):
> super().__init__(parent)
>=20
> self.title =3D 'Window 1'
> self.left =3D 700
> self.top =3D 300
> self.width =3D 200
> self.height =3D 200
> self.initUI()
>=20
> def initUI(self):
>=20
> self.keypad_window =3D Keypad_Window(self)
>=20
> hbox =3D QHBoxLayout()
>=20
> self.cle =3D CustomLineEdit()
> self.cle.clicked.connect(self.show_keypad_window)
> self.cle.setFixedSize(220, 60)
> self.cle.setStyleSheet("color: red;"
> "background-color: yellow;"
> "font-family: Arial;"
> "font-weight: Bold;"
> "font-size: 30pt")
>=20
> hbox.addWidget(self.cle)
> self.setLayout(hbox)
>=20
> self.setWindowTitle(self.title)
> self.setGeometry(self.left, self.top, self.width, self.height)
> self.show()
>=20
> def show_keypad_window(self):
> self.keypad_window.show()
> self.hide()
>=20
> def close(self):
> self.keypad_window.close()
> super(MainWindow, self).close()
>=20
> @pyqtSlot(str)
> def update_label(self, txt):
> self.cle.setText(txt)
>=20
> class Keypad_Window(QWidget):
> def __init__(self, parent=3DNone):
> super().__init__()
> self.parent =3D parent
>=20
> self.setGeometry(1200, 500, 230, 400)
>=20
> vbox =3D QVBoxLayout()
> self.display =3D QLineEdit()
> self.display.setFixedSize(220, 60)
> self.display.setReadOnly(True)
> self.display.setStyleSheet("color: Blue; "
> "background-color: lightgreen;"
> "font-family: Arial;"
> "font-weight: Bold;"
> "font-size: 18pt")
> vbox.addWidget(self.display)
>=20
> """Create the buttons."""
> self.buttons =3D {}
> self.gridlay =3D QGridLayout()
>=20
> self.button_name =3D [['7', '8', '9'],
> ['4', '5', '6'],
> ['1', '2', '3'],
> ['C', '0', '>']]
>=20
> self.command_name =3D [['7', '8', '9'],
> ['4', '5', '6'],
> ['1', '2', '3'],
> ['delete', '0', 'accept']]
>=20
> for i in range(4):
> for j in range(3):
> text =3D self.button_name[i][j]
>=20
> # keep a reference to the buttons
> self.buttons[i, j] =3D QPushButton()
> self.buttons[i, j].setText(text)
> self.buttons[i, j].setObjectName(text)
> self.buttons[i, j].setFixedSize(70, 70)
> if i =3D=3D 3:
> if j =3D=3D 0:
> self.buttons[i, j].setToolTip('Each click deletes\na digit to the left')
>=20
> if j =3D=3D 2:
> self.buttons[i, j].setToolTip('The whole displayed\nvalue will be taken!')
>=20
> self.buttons[i, j].clicked.connect(self.call_button_fun(i, j,
> self.command_name))
>=20
> # add to the GridLayout
> self.gridlay.addWidget(self.buttons[i, j], i, j)
> self.buttons[i, j].setStyleSheet("color: blue; "
> "background-color: cyan;"
> "font-family: Arial;"
> "font-weight: Bold;"
> "font-size: 20pt")
> vbox.addLayout(self.gridlay)
> self.setLayout(vbox)
>=20
> def call_button_fun(self, i, j, command_name):
> def button_fun():
> if command_name[i][j] =3D=3D self.button_name[i][j]:
> displayed_text =3D self.display.text()
> self.new_text =3D displayed_text + self.button_name[i][j]
> self.display.setText(self.new_text)
>=20
> if command_name[i][j] =3D=3D 'accept':
> print('>-key pressed!')
> self.parent.cle.setText(self.new_text)
> self.close()
>=20
> if command_name[i][j] =3D=3D 'delete':
> print('C-key pressed!')
> self.display.setText('')
>=20
> return button_fun
>=20
> if __name__ =3D=3D "__main__":
> app =3D QApplication(sys.argv)
> mainwindow =3D MainWindow()
>=20
> # Exception abfangen, wenn sie nicht behandelt wurde
> sys._excepthook =3D sys.excepthook
>=20
> def exception_hook(exctype, value, traceback):
> print(exctype, value, traceback)
> sys._excepthook(exctype, value, traceback)
> sys.exit(1)
>=20
> sys.excepthook =3D exception_hook
>=20
> sys.exit(app.exec_())
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