如何在PyQt4/PySide的eventfilter中的QListWidget上作画？

from PyQt4.QtGui import QListWidget, QPainter, QColor, QBrush

class CustomListWidget(QListWidget):
    def paintEvent(self, event):
        painter = QPainter(self.viewport())
        painter.setRenderHint(QPainter.Antialiasing)
        
        # 在这里进行绘图操作，可以使用painter绘制各种图形、文本等
        
        super(CustomListWidget, self).paintEvent(event)

from PyQt4.QtCore import QEvent

list_widget = CustomListWidget()

def eventFilter(obj, event):
    if obj == list_widget and event.type() == QEvent.Paint:
        list_widget.paintEvent(event)
    
    return False

list_widget.installEventFilter(eventFilter)