I’m looking for a way to implement the above. I have created a custom QTextEdit, that display the character count and the allowed character count in a QLabel below. When I create an instance of this class, everything works as expected, except the .setMaxLength function I’ve tried to recreate. Below is my custom QTextEdit class

class CustomTextEdit(QWidget):
   def __init__(self, max_length=None, placeholder_text='', height=None, callback=None, *args, **kwargs):
       super().__init__(*args, **kwargs)

       self.max_length = max_length

       self.text_edit = QTextEdit(self)
       self.label = QLabel(self)

       if height:
           self.setFixedHeight(height)

       if placeholder_text:
           self.text_edit.setPlaceholderText(placeholder_text)
       if callback:
           self.text_edit.textChanged.connect(callback)

       self.text_edit.textChanged.connect(self.update_char_count)
       self.text_edit.setLineWrapMode(QTextEdit.LineWrapMode.WidgetWidth)
       self.text_edit.setWordWrapMode(QTextOption.WrapMode.WordWrap)

       layout = QVBoxLayout()
       layout.setContentsMargins(0, 0, 0, 0)
       layout.setSpacing(0)
       layout.addWidget(self.text_edit, 1)
       layout.addWidget(self.label, alignment=Qt.AlignmentFlag.AlignRight)
       self.setLayout(layout)

       self.update_char_count()

   def update_char_count(self):
       char_count = len(self.text_edit.toPlainText())
       self.label.setText(f'{char_count}/{self.max_length if self.max_length is not None else "∞"}')

   def keyPressEvent(self, event):
       if self.max_length is not None:
           # Allow special keys and deletion regardless of character count
           if event.key() in (Qt.Key.Key_Backspace, Qt.Key.Key_Delete, Qt.Key.Key_Left, Qt.Key.Key_Right,
                              Qt.Key.Key_Up, Qt.Key.Key_Down, Qt.Key.Key_Control, Qt.Key.Key_Shift, Qt.Key.Key_Alt):
               super().keyPressEvent(event)
               return

           # Check if current character count exceeds max_length
           current_text = self.text_edit.toPlainText()
           if len(current_text) >= self.max_length and event.text():
               return  # Ignore new character input if it exceeds max_length

       super().keyPressEvent(event)