[SOLVED] PyQt QPlainTextEdit "Command + Backpace" doesn't delete the line on MacOS

PyQt QPlainTextEdit "Command + Backpace" doesn't delete the line on MacOS

Pressing Command + Backspace on MacOs normally deletes the current line. Is it possible to reproduce this behaviour in QPlainTextEdit? It works as expected with QLineEdit.

Here's a minimal example to reproduce the issue:

from PyQt5.QtWidgets import *
from PyQt5.QtGui import QKeySequence


app = QApplication([])
text = QPlainTextEdit()
window = QMainWindow()
window.setCentralWidget(text)

window.show()
app.exec_()

I am running the following: Python 3.6.10 PyQt5 5.14.1 MacOS 10.14.6

Solution

You should probably subclass QPlainTextEdit and override its keyPressEvent.

As far as I can understand, on MacOS command+backspace deletes the text at the left of the current cursor position, but it's also possible to delete the entire line, no matter what.

In any case:

class PlainText(QPlainTextEdit):
    def keyPressEvent(self, event):
        if event.key() == Qt.Key_Backspace and event.modifiers() == Qt.ControlModifier:
            cursor = self.textCursor()

            # use this to remove everything at the left of the cursor:
            cursor.movePosition(cursor.StartOfLine, cursor.KeepAnchor)
            # OR THIS to remove the whole line
            cursor.select(cursor.LineUnderCursor)

            cursor.removeSelectedText()
            event.setAccepted(True)
        else:
            super().keyPressEvent(event)