javascript - How to connect a destroyed signal of C++ object from QML? -

i want connect destroyed signal of c++ qobject qml did this:

rectangle {     id: root     width: 128     height: 128  button {     anchors.centerin: parent     text: "click me"     onclicked:     {         qobj.component.ondestruction.connect(function(){console.log("it destroy")}) // qobj set c++         qobj.destroy() // should output "it destroy"     } } 

but nothing printed when destroy qobj.

in general case, can connect signals emitted c++ object using connections element:

connections {     target: yourobjectcomingfromcpp     onsomesignal: console.log("something") } 

or in javascript calling connect function on corresponding property of js-mapped object:

// without *on*! yourobjectcomingfromcpp.somesignal.connect( /* js function here */ ); 

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however: doesn't work specific qobject::destroyed signals, forcibly blacklisted , never available in qml (source).

i guess reason object gone qml context anyhow @ point, plus when signal emitted you're deep qobject's own destructor, means property or method access on subclass invalid @ point.