How to intercept and propagate an event from overlapping widgets

问题

I'd like to intercept an event from a widget placed on-top of another widget, without consuming it.

Here's what I've got so far. When clicking the overlapping part, I'd like it to print "Hello World", but all I'm getting is "Hello".

import sys
from PyQt5 import QtWidgets


class Button(QtWidgets.QPushButton):
    def mousePressEvent(self, event):
        print self.text()
        return super(Button, self).mousePressEvent(event)


app = QtWidgets.QApplication(sys.argv)
window = QtWidgets.QWidget()
window.setFixedSize(200, 100)

button1 = Button("World", window)
button1.move(10, 10)
button2 = Button("Hello", window)
button2.move(50, 15)

window.show()
app.exec_()

Here's an example in QML that does what I'm looking for.

import QtQuick 2.0


Item {
    id: root
    width: 200; height: 100

    MouseArea {
        anchors.fill: parent
        onPressed: console.log("World")
    }

    Rectangle {
        color: "green"
        width: 100; height: 50
        x: 10; y: 10

        MouseArea {
            anchors.fill: parent
            propagateComposedEvents: true
            onPressed: {
                console.log("Hello");
                mouse.accepted = false;
            }
        }
    }
}

Clicking the window yields "World" whereas clicking the green rectangle yields "Hello" followed by "World". The key here is the propagateComposedEvents

回答1:

There's a window attribute which does what you want:

button = Button("Hello", window)
button.setAttribute(QtCore.Qt.WA_TransparentForMouseEvents)

来源：https://stackoverflow.com/questions/27331552/how-to-intercept-and-propagate-an-event-from-overlapping-widgets