Like many other GUI toolkits, Qt supports connecting handler functions
to signals, which are emitted in response to user
actions. The qconnect function connects an R function to a
signal on a Qt object.
Usage
qconnect(x, signal, handler, user.data)
Arguments
x
The Qt object providing the signal
signal
The name of the signal
handler
The R function to handle the signal
user.data
Data to pass to the R function as the last parameter. If omitted, no
such argument is passed to the handler.
Value
A dummy QObject instance that is listening to the signal. Will
become invalid when the signal emitter is invalidated.
Details
In Qt, only other QObject instances can listen to a signal, so
this function creates a dummy object that invokes the R function upon
receipt of the signal.
To disconnect a handler, call the disconnect method on the
signal emitter x, passing it the returned dummy QObject;
see the example.