具有级联 QSortFilterProxyModel 的信号顺序

Question

我有一个源模型，顶部有几个级联 QSortFilterProxyModel。对于我的应用程序，我需要modelReset 信号从下到上冒泡，而不是相反，我该怎么做？

mwe：

from PyQt5 import QtWidgets, QtCore
import sys


class Model(QtCore.QAbstractTableModel):
    def reset(self):
        self.beginResetModel()
        self.endResetModel()


class Filter(QtCore.QSortFilterProxyModel):
    def __init__(self, model, arg):
        super().__init__(model)
        self.setSourceModel(model)
        model.modelReset.connect(lambda: print(f'Reset {arg}'))


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)

    model = Model()
    filter0 = Filter(model, '0')
    filter1 = Filter(filter0, '1')
    filter2 = Filter(filter1, '2')
    filter3 = Filter(filter2, '3')

    button = QtWidgets.QPushButton('Reset')
    button.clicked.connect(model.reset)
    button.show()

    sys.exit(app.exec_())

返回：

Reset 3
Reset 2
Reset 1
Reset 0

但我想拥有

Reset 0
Reset 1
Reset 2
Reset 3

Answer 1

你的代码有错误，你监控的是sourceModel，而不是监控当前模型信号，它只会变成：

import sys
from PyQt5 import QtWidgets, QtCore


class Model(QtCore.QAbstractTableModel):
    def reset(self):
        self.beginResetModel()
        self.endResetModel()


class Filter(QtCore.QSortFilterProxyModel):
    def __init__(self, model, arg, parent=None):
        super().__init__(parent)
        self.setSourceModel(model)
        self.modelReset.connect(lambda: print(f'Reset {arg}')) # <---


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)

    model = Model()
    filter0 = Filter(model, '0')
    filter1 = Filter(filter0, '1')
    filter2 = Filter(filter1, '2')
    filter3 = Filter(filter2, '3')

    button = QtWidgets.QPushButton('Reset')
    button.clicked.connect(model.reset)
    button.show()

    sys.exit(app.exec_())

输出：

Reset 0
Reset 1
Reset 2
Reset 3