pyqt TextEdit光标换行问题

[qq_39484966]

想做一个ctrl+enter换行，enter结束编辑的textedit，谢了一部分代码但为什么换不了行呢？

class TextEdit(QTextEdit):

    def __init__(self, parent=None):
        super(TextEdit, self).__init__(parent)

    def event(self, event):
        if (event.type() == QEvent.KeyPress and
            event.key() == Qt.Key_Return):
            if event.modifiers() & Qt.ControlModifier:
#                cursor = self.textCursor()
#                cursor.insertText("    ")
                self.moveCursor(QTextCursor.StartOfLine)
                return True
            return QTextEdit.event(self, event)
        return QTextEdit.event(self, event)