Creating indent guides for QPlainTextEdit

[Kozersky]

I am trying to create indentation guides for basic text viewer. Currently I have stopped at following piece of code:

def paintEvent(self, event):
            font = QtGui.QFont('Courier', 10, QtGui.QFont.Light)
            font_metrics = QtGui.QFontMetrics(font)
            self.font_width = font_metrics.width('X')
            self.font_height = font_metrics.height()
            self.setFont(font)
 
            painter = QPainter(self.viewport())
            #painter.begin()
            longest_line = 20
            from_top = 0
            painter.setPen(QtGui.QColor(0, 100, 200, 200))
            for i in range(0, longest_line):
                the_x = self.font_width + (i * 4 * self.font_width)
                painter.drawLine(the_x, from_top, the_x, from_top + self.font_height)
 
            QPlainTextEdit.paintEvent(self, event)
            #painter.end()
            #self.updateScrollbars()
            super(QPlainTextEdit, self).paintEvent(event)
            return

def paintEvent(self, event):
            font = QtGui.QFont('Courier', 10, QtGui.QFont.Light)
            font_metrics = QtGui.QFontMetrics(font)
            self.font_width = font_metrics.width('X')
            self.font_height = font_metrics.height()
            self.setFont(font)
            
            painter = QPainter(self.viewport())
            #painter.begin()
            longest_line = 20
            from_top = 0
            painter.setPen(QtGui.QColor(0, 100, 200, 200))
            for i in range(0, longest_line):
                the_x = self.font_width + (i * 4 * self.font_width)
                painter.drawLine(the_x, from_top, the_x, from_top + self.font_height)

            QPlainTextEdit.paintEvent(self, event)
            #painter.end()
            #self.updateScrollbars()
            super(QPlainTextEdit, self).paintEvent(event)
            return

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This code is not finished as it seems to me somewhat ugly solution. My question is -- is there any guide, or piece of code I can learn from? It does not matter which language. I also could not find relevant topics in this forum, search results are too verbose.

And just to clarify, this is what I am trying to reproduce: https://visualstudiogallery.msdn.mic...5-630980e72c30.

[Kozersky]

For anyone who may search for the solution of the same problem -- I have found example in the following software: http://www.iep-project.org/. It contains pretty much everything you may need for editor.