[英]How to paint on top of QListWidget in eventfilter in PyQt4/PySide?
我在 QLable 上尝试了这个并且它有效,我不想对小部件进行子类化,因为它们是在 .ui 文件中定义的,我只需要做简单的修改,所以我想避免委托。 如果我把我的代码放在paintEvent中它可以工作,但为什么我不能把它放在eventfilter中?
它似乎绘制了正方形,但它位于 listWidgetItem 区域下方。
# -*- coding: utf-8 -*-
from PySide.QtCore import *
from PySide.QtGui import *
class xxxx(QListWidget):
def __init__(self, parent=None):
super(xxxx, self).__init__(parent)
self.installEventFilter(self)
# def paintEvent(self, event):
# p = QPainter()
# p.begin(self.viewport())
# p.setPen(QPen(Qt.black))
# p.fillRect(QRect(0, 1, 20, 20), Qt.red)
# p.end()
def eventFilter(self, widget, event):
if event.type() == QEvent.Paint:
p = QPainter()
# p.begin(self.viewport())
p.begin(widget)
p.setPen(QPen(Qt.red))
p.fillRect(QRect(0, 1, 20, 20), Qt.red)
p.end()
return True
return QListWidget.eventFilter(self, widget, event)
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
view = xxxx()
view.show()
sys.exit(app.exec_())
您需要在视口上安装事件过滤器:
class xxxx(QListWidget):
def __init__(self, parent=None):
super(xxxx, self).__init__(parent)
self.viewport().installEventFilter(self)
def eventFilter(self, widget, event):
if event.type() == QEvent.Paint and widget is self.viewport():
p = QPainter()
p.begin(widget)
p.setPen(QPen(Qt.red))
p.fillRect(QRect(0, 1, 20, 20), Qt.red)
p.end()
return True
return super(xxxx, self).eventFilter(widget, event)
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