Reputation: 39
I want show text after enter key pressed
from PyQt5.QtWidgets import QWidget, QApplication, QPlainTextEdit, QVBoxLayout, QLabel
from PyQt5.QtCore import Qt
import sys
class PlainTextEdit(QPlainTextEdit):
def __init__(self, parent):
super().__init__(parent=parent)
close_window = ClosingWindow()
vbox = QVBoxLayout()
self.close_window.setLayout(vbox)
def keyPressEvent(self, QKeyEvent):
if QKeyEvent.key() == Qt.Key_Enter:
self.close_window.label_display.setText("Enter key pressed")
class ClosingWindow(QWidget):
def __init__(self):
super().__init__()
plainText = PlainTextEdit(self)
self.initUI()
def initUI(self):
vbox = QVBoxLayout()
label_display = QLabel("Text Here")
self.setLayout(vbox)
self.setWindowTitle("Message Box")
self.setGeometry(200, 200, 500, 300)
self.show()
if __name__ == "__main__":
app = QApplication(sys.argv)
close_win = ClosingWindow()
sys.exit(app.exec_())
Upvotes: 1
Views: 470
Reputation: 244301
Your code has the following errors:
You are creating an infinite loop: You are creating a PlainTextEdit within a ClosingWindow, and in that PlainTextEdit you are creating another ClosingWindow, and in that other ClosingWindow you are creating a PlainTextEdit, etc. Every time you use the constructor of a class you are creating a different object, so the "close_window" created in PlainTextEdit is different from the "close_win".
Each class must have a single responsibility (1), in your case the responsibility of PlainTextEdit is to notify that it was pressed enter, and in that case you must use a signal.
The enter key on the keyboard does not correspond to Qt::Key_Enter but Qt::Key_Return, it only corresponds to Qt::Key_Return on the keypad.
It is not necessary to create a layout in PlainTextEdit.
Considering the above, the solution is:
from PyQt5 import QtCore, QtWidgets
class PlainTextEdit(QtWidgets.QPlainTextEdit):
sendTextSignal = QtCore.pyqtSignal(str)
def keyPressEvent(self, event):
if event.key() in (QtCore.Qt.Key_Enter, QtCore.Qt.Key_Return):
self.sendTextSignal.emit("Enter key pressed")
else:
self.sendTextSignal.emit("Not Enter key pressed")
super().keyPressEvent(event)
class ClosingWindow(QtWidgets.QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
plainText = PlainTextEdit()
label_display = QtWidgets.QLabel("Text Here")
plainText.sendTextSignal.connect(label_display.setText)
vbox = QtWidgets.QVBoxLayout(self)
vbox.addWidget(plainText)
vbox.addWidget(label_display)
self.setWindowTitle("Message Box")
self.setGeometry(200, 200, 500, 300)
self.show()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
close_win = ClosingWindow()
sys.exit(app.exec_())
(1) Single responsibility principle
Upvotes: 1