我正在尝试创建一个带有分隔线的 TextEdit 小部件。首先，我创建了一个MyTextEdit类（作为一个子类QTextEdit）并覆盖其paintEvent() method:
import sys
from PyQt4.QtGui import QApplication, QTextEdit, QPainter
class MyTextEdit(QTextEdit):
"""A TextEdit widget derived from QTextEdit and implementing its
own paintEvent"""
def paintEvent(self, event):
painter = QPainter(self)
painter.drawLine(0, 10, 10, 10)
QTextEdit.paintEvent(self, event)
app = QApplication(sys.argv)
textEdit = MyTextEdit()
textEdit.show()
sys.exit(app.exec_())
尝试执行这段代码，我得到lots出现以下错误：
QPainter::begin: Widget painting can only begin as a result of a paintEvent
QPainter::begin: Widget painting can only begin as a result of a paintEvent
...
我究竟做错了什么？
如果一个小部件有一个viewport，你必须将其传递给QPainter构造函数：
painter = QPainter(self.viewport())
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