ListenerDemo

class ListenerDemo(name=None, parent=None)

Bases: taurus.qt.qtcore.taurusqlistener.QObjectTaurusListener

eventReceived(evt_src, evt_type, evt_value)

The basic implementation of the event handling chain is as follows:

• eventReceived just calls fireEvent() which emits a “taurusEvent” PyQt signal that is connected (by preAttach()) to the filterEvent() method.
• After filtering, handleEvent() is invoked with the resulting filtered event

Note

in the earlier steps of the chain (i.e., in eventReceived()/fireEvent()), the code is executed in a Python thread, while from eventFilter ahead, the code is executed in a Qt thread. When writing widgets, one should normally work on the Qt thread (i.e. reimplementing handleEvent())

Parameters:

• evt_src (object) – object that triggered the event
• evt_type (TaurusEventType) – type of event
• evt_value (object) – event value

handleEvent(evt_src, evt_type, evt_value)

Event handling. Default implementation does nothing. Reimplement as necessary

Parameters:

• evt_src (object or None) – object that triggered the event
• evt_type (TaurusEventType or None) – type of event
• evt_value (object or None) – event value