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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _draw_placeholder(self):
 """To be used in QTreeView"""

        if self.model().rowCount() == 0:
            painter = QPainter(self.viewport())
            painter.setFont(_custom_font(is_italic=True))
            painter.drawText(self.rect().adjusted(0, 0, -5, -5), Qt.AlignCenter | Qt.TextWordWrap,
                             self.PLACEHOLDER)