如何截获Qt中给定事件发出的所有信号?

这在任何公共API中都是不可能的。

-vs 打印出每个发出的信号。

QSignalSpy 班级。

• 列出使用QMetaObject::method和QMetaMethod::methodType的类的所有信号;
• 检查谁使用QObject::sender调用了插槽。

但这件事之后我就被困住了。我不认为,除了发送方之外,还可以获得关于如何调用slot的任何信息。

如果使用PyQT5而不是Qt5,那么可以使用Python的内省功能查找任何类的所有信号,并将它们连接到(虚拟对象的)虚拟槽。

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from typing import Iterable

from PyQt5.QtCore import pyqtBoundSignal
from PyQt5.QtCore import pyqtSlot
from PyQt5.QtCore import QObject


def list_all_signals(obj: QObject) -> Iterable[pyqtBoundSignal]:
    attr_names = dir(obj)
    attributes = (getattr(obj, attr_name) for attr_name in attr_names)
    connectable = filter(lambda l: hasattr(l, "connect"), attributes)

    return connectable


class SignalListener(QObject):
    @pyqtSlot()
    def universal_slot(self, *args, **kwargs):
        print("Signal caught" + 30 * "-")
        print("sender:", self.sender())
        meta_method = (
            self.sender().metaObject().method(self.senderSignalIndex())
        )
        print("signal:", meta_method.name())
        print("signal signature:", meta_method.methodSignature())


SIGNAL_LISTENER = SignalListener()


def spy_on_all_signals(
    obj: QObject, listener: SignalListener = SIGNAL_LISTENER
):
    for signal in list_all_signals(obj):
        signal.connect(SIGNAL_LISTENER.universal_slot)

例如,如果您监视随机QLineEdit,如下所示:

some_line_edit = QLineEdit(self)
spy_on all_signals(some_line_edit)

Signal caught ------------------------------
sender: <PyQt5.QtWidgets.QLineEdit object at 0x7f220f7a3370>
signal: b'cursorPositionChanged'
signal signature: b'cursorPositionChanged(int,int)'
Signal caught ------------------------------
sender: <PyQt5.QtWidgets.QLineEdit object at 0x7f220f7a3370>
signal: b'selectionChanged'
signal signature: b'selectionChanged()'
Signal caught ------------------------------
sender: <PyQt5.QtWidgets.QLineEdit object at 0x7f220f7a3370>
signal: b'selectionChanged'
signal signature: b'selectionChanged()'
Signal caught ------------------------------
sender: <PyQt5.QtWidgets.QLineEdit object at 0x7f220f7a3370>
signal: b'editingFinished'
signal signature: b'editingFinished()'

退房 signal spying . 对QT库和监视信号/插槽有了一些很好的了解。