如何解决在 on_change 函数中删除父布局SIGSEGV 错误
我有一个 QComboBox,cbo_box
,嵌套在一个框架 self.ui.frameFilterControls
中,带有:cbo_box.currentTextChanged.connect(self.choice_changed)
。在 self.choice_changed()
中,我调用一个函数来清除框架布局,包括 cbo_box
,然后使用适当的控件(包括新的 cbo_box
)重新生成布局:
layout = self.ui.frameFilterControls.layout()
if layout is not None:
#clear layout
for i in reversed(range(layout.count())):
layout.itemAt(i).widget().setParent(None)
我遇到的问题是当 self.choice_changed()
返回时,它会抛出一个 SIGSEGV 错误:
Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)
我猜是因为它无处可去,但我不确定。我想知道是否可以不调用在 on_change
的 cbo_box
中删除和重新创建控件的函数,如果我可以安排它在下一次表单更新时对其进行评估,或者其他类似的东西线?
编辑:
我制作了一个重现行为的最小示例。
from PySide6 import QtCore,QtWidgets
from PySide6.QtWidgets import (QApplication,QListWidgetItem,QGridLayout,QVBoxLayout,QLineEdit,QComboBox)
import sys
#from output of designer -> simple main form with a frame for a starting point
class Ui_MainWindow(object):
def setupUi(self,MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(381,357)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
self.verticalLayout.setObjectName("verticalLayout")
self.frame = QtWidgets.QFrame(self.centralwidget)
self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
self.frame.setObjectName("frame")
self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.frame)
self.verticalLayout_2.setObjectName("verticalLayout_2")
self.pushButton = QtWidgets.QPushButton(self.frame)
self.pushButton.setObjectName("pushButton")
self.verticalLayout_2.addWidget(self.pushButton)
self.verticalLayout.addWidget(self.frame)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0,381,22))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self,MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow","MainWindow"))
self.pushButton.setText(_translate("MainWindow","PushButton"))
class MainGUI(QtWidgets.QMainWindow):
def __init__(self,parent=None):
super(MainGUI,self).__init__(parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.set_frame_controls()
def set_frame_controls(self):
layout = self.ui.frame.layout()
if layout is not None:
#clear layout
for i in reversed(range(layout.count())):
layout.itemAt(i).widget().setParent(None)
cbo_box = QComboBox()
cbo_box.addItem("test 1")
cbo_box.addItem("test 2")
cbo_box.currentTextChanged.connect(self.choice_changed)
layout.addWidget(cbo_box)
def choice_changed(self):
print("choice_changed")
cbo_box = self.sender()
self.set_frame_controls()
print("end choice changed")
def main():
app = QApplication(sys.argv)
form = MainGUI()
form.show()
app.exit(app.exec_())
if __name__ == '__main__':
main()
当我运行上述程序并将组合框从“test 1”切换到“test 2”时,其控制台输出如下:
choice_changed
end choice changed
Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)
我想要的行为是完全重新生成框架,没有错误。谢谢!
解决方法
如果您想从布局中删除小部件,设置空父级是不够的,因为这不会将其从布局具有的内部列表中删除,而只会删除导致 SIGSEGV 的 c++ 对象。相反,您必须使用 deleteLater()
,如果它确保正确消除元素(例如布局的内部列表)。
def set_frame_controls(self):
layout = self.ui.frame.layout()
if layout is not None:
for i in reversed(range(layout.count())):
widget = layout.itemAt(i).widget()
if widget is not None:
widget.deleteLater()
cbo_box = QComboBox()
cbo_box.addItem("test 1")
cbo_box.addItem("test 2")
cbo_box.currentTextChanged.connect(self.choice_changed)
layout.addWidget(cbo_box)
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。