Hi I have a QListView widget displayed correctly on my user interface.
I am registering a callback to a completely separate 3rd party library. This callback will be called on a completely separate thread to my user interface. I need this callback to interact with the QListView widget and set a new data model, so I believe I have to use
MyDataModel * model = new MyDataModel( ui->listViewWidget );
QMetaObject::invokeMethod( ui->listViewWidget, "setModel", Q_ARG( MyDataModel *, model ) );
However, It doesn't seem to work. i.e. no data is presented in the QListView widget. I've debugged the return value from QMetaObject::invokeMethod and it's returning false which suggests there's no method called "setModel" on the QListView. However, when I arrange for the callback to be called via the user interface thread, i.e. through a pushbutton on_clicked() event and make a call to
MyDataModel * model = new MyDataModel( ui->listViewWidget );
ui->listViewWidget->setModel( model );
This works perfectly, so there is a "setModel" method on the QListView..
Can someone please help me understand why QMetaObject::invokeMethod isn't working and maybe clear up wether I need to call invokeMethod in this way. i.e. are my thread assumptions correct about it needing to be ran on the event loop thread.
Yours, dazed and confused.. Mark.
The method QMetaObject::invokeMethod invokes only slot or signal on the object. Therefore your setModel must declared as slot. Also Q_ARG() takes a type name and a const reference of that type.