QObject Class Qt Core 2

Explicitly calling a Python slot from QML · Returning a value from a slot · Connecting signals from QML to Python using a top-level QML signal

Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time

qt slot Explicitly calling a Python slot from QML · Returning a value from a slot · Connecting signals from QML to Python using a top-level QML signal

qt connect signal to slot with parameter Qt uses the signalslot Compared with callback functions, this mechanism has the advantage that Qt automatically dis- mantles a connection if