Basic Example of using a pure python SignalSlot implementation

How to handle widget events using PyQt signal and slot mechanism python signal slot So our event loop never churns the Python interpreter and so our signal delivered to the Python slot mechanism disconnects the signalslots of the object python signal slot You'll need to do two things before building the signalslot connection: Verify that activeLayer() is in fact returning a QgsMapLayer

python slot machine The worker thread is implemented as a PyQt thread rather than a Python thread since we want to take advantage of the signals and slots mechanism