def __init__(self, parent):
self.parent = parent
self.parent.setAttribute(Qt.WA_DeleteOnClose)
text = QPlainTextEdit(self.parent)
lineNumbers = QPlainTextEdit(self.parent)
lineNumbers.setMaximumWidth(20)
lineNumbers.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
lineNumbers.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
lineNumbers.setFrameShape(QFrame.StyledPanel)
lineNumbers.setFrameShadow(QFrame.Plain)
lineNumbers.setEnabled(False)
grid = QGridLayout(self.parent)
grid.addWidget(lineNumbers, 0, 0, 1, 1)
grid.addWidget(text, 0, 1, 1, 1)
text.blockCountChanged.connect(self.parent.setLineNumbers)
text.updateRequest.connect(self.parent.scrollLineNumbers)
text.cursorPositionChanged.connect(self.parent.highlightCurrentLine)
text.document().contentsChanged.connect(self.parent.documentModified)
self.parent.text = text
self.parent.lineNumbers = lineNumbers
