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如何在PyQt5中发出dataChanged(How to emit dataChanged in PyQt5)

 下面的代码在self.emit行中断开。 它在PyQt4中工作正常。 如何解决这个代码，使它在PyQt5中工作？  
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QObject, pyqtSignal

class ItemDelegate(QtWidgets.QItemDelegate):
    def __init__(self, parent):
        QtWidgets.QItemDelegate.__init__(self, parent)

    def createEditor(self, parent, option, index):
        return QtWidgets.QLineEdit()

    @QtCore.pyqtSlot()
    def setModelData(self, editor, model, index): 
        self.emit(QtCore.SIGNAL("dataChanged(QModelIndex,QModelIndex)"), index, index)  
 
 稍后编辑：  
 工作解决方案：  
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QObject, pyqtSignal

class Communicate(QObject):
    data_changed = pyqtSignal(QtCore.QModelIndex, QtCore.QModelIndex)

class ItemDelegate(QtWidgets.QItemDelegate):
    def __init__(self, parent):
        QtWidgets.QItemDelegate.__init__(self, parent)
        self.c = Communicate()

    @QtCore.pyqtSlot()
    def setModelData(self, editor, model, index):
        self.c.data_changed.emit(index, index)

The code below breaks on self.emit line. It works fine in PyQt4. How to fix this code so it works in PyQt5? 
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QObject, pyqtSignal

class ItemDelegate(QtWidgets.QItemDelegate):
    def __init__(self, parent):
        QtWidgets.QItemDelegate.__init__(self, parent)

    def createEditor(self, parent, option, index):
        return QtWidgets.QLineEdit()

    @QtCore.pyqtSlot()
    def setModelData(self, editor, model, index): 
        self.emit(QtCore.SIGNAL("dataChanged(QModelIndex,QModelIndex)"), index, index)  
 
Edited later: 
A working solution: 
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QObject, pyqtSignal

class Communicate(QObject):
    data_changed = pyqtSignal(QtCore.QModelIndex, QtCore.QModelIndex)

class ItemDelegate(QtWidgets.QItemDelegate):
    def __init__(self, parent):
        QtWidgets.QItemDelegate.__init__(self, parent)
        self.c = Communicate()

    @QtCore.pyqtSlot()
    def setModelData(self, editor, model, index):
        self.c.data_changed.emit(index, index)

原文：https://stackoverflow.com/questions/38177144

更新时间：2022-12-19 13:12

最满意答案

 是的，有一种方法可以在不从通用基类继承参数的情况下做到这一点。 它没有很好的记录，只是在IDynamicParameters.GetDynamicParameters方法的评论中暗示。 以下是对该主题的更详细的处理。  
 首先，使用[Parameter]属性声明属性的公共参数来创建一个类：  
internal class MyCommonParmeters
{
    [Parameter] 
    public string Foo { get; set; }
    [Parameter]
    public int Bar { get; set; }
    ...
}
 
 然后，每个想要使用这些公共参数的Cmdlet都应该实现IDynamicParameters接口，以返回MyCommonParameters类的成员实例：  
[Cmdlet(VerbsCommon.Add, "Froz")]
public class AddFroz : PSCmdlet, IDynamicParameters
{
    private MyCommonParmeters MyCommonParameters 
        = new MyCommonParmeters();

    object IDynamicParameters.GetDynamicParameters()
    {
        return this.MyCommonParameters;
    }
    ...
 
 通过这种方法，PowerShell命令参数绑定器将查找并填充MyCommonParameters实例上的参数，就像它们是Cmdlet类的成员一样。 

Yes, there is a way to do this without inheriting from a common base class for the parameters. Its not not well documented, only hinted at in the IDynamicParameters.GetDynamicParameters method's remarks. Here's a more detailed treatment of the topic. 
First, create a class with your common parameters declared as properties with the [Parameter] attributes: 
internal class MyCommonParmeters
{
    [Parameter] 
    public string Foo { get; set; }
    [Parameter]
    public int Bar { get; set; }
    ...
}
 
Then each Cmdlet that wants to use these common parameters should implement the IDynamicParameters interface to return a member instance of the MyCommonParameters class: 
[Cmdlet(VerbsCommon.Add, "Froz")]
public class AddFroz : PSCmdlet, IDynamicParameters
{
    private MyCommonParmeters MyCommonParameters 
        = new MyCommonParmeters();

    object IDynamicParameters.GetDynamicParameters()
    {
        return this.MyCommonParameters;
    }
    ...
 
With this approach, the PowerShell command parameter binder will find and populate the parameters on the MyCommonParameters instance just as if they were members of the Cmdlet classes.

如何在PyQt5中发出dataChanged(How to emit dataChanged in PyQt5)

稍后编辑：

Edited later:

最满意答案

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