无法从QML中检索PySide Signal参数

Question

我注意到QML可以通过使用Connections对象来接收Python发出的信号。不幸的是，我无法弄清楚如何使该对象接收该信号的参数。

我创建了一个最小的测试用例，演示了我想做的事情：

最低

from PySide import QtCore, QtGui, QtDeclarative
import sys

# init Qt
app = QtGui.QApplication(sys.argv)

# set up the signal
class Signaller(QtCore.QObject):
    emitted = QtCore.Signal(str)

signaller = Signaller()

# Load the QML
qt_view = QtDeclarative.QDeclarativeView()
context = qt_view.rootContext()
context.setContextProperty('signaller', signaller)
qt_view.setResizeMode(QtDeclarative.QDeclarativeView.SizeRootObjectToView)
qt_view.setSource('min.qml')
qt_view.show()

# launch the signal
signaller.emitted.emit("Please display THIS text!")

# Run!
app.exec_()

和最小qml

import QtQuick 1.0

Rectangle {
    width:300; height:100

    Text {
        id: display
        text: "No signal yet detected!"

        Connections {
            target: signaller
            onEmitted: {
                display.text = "???" //how to get the argument?
            }
        }
    }
}

Answer 1

从Qt 4.8开始，PySide根本不处理信号参数名称。

但是您可以使用命名参数创建QML信号，并使用Javascript将python信号连接至该信号：

import QtQuick 1.0

Rectangle {
    width:300; height:100


    Text {
        id: display
        text: "No signal yet detected!"

        signal reemitted(string text)
        Component.onCompleted: signaller.emitted.connect(reemitted)

        onReemitted: {
          display.text = text;        
        }
    }
}