A simple implementation of the Signal/Slot pattern. I originally uploaded this to ASPN's python cookbook in 2005. To use, simply create a Signal instance and connect() methods, which act as the 'slot' in this design pattern. The instance of signal is self-sufficient; it doesn't have to be a memberof a class. Connect slots to the signal using the 'connect()' method. The slot may be a member of a class or a simple function. Signal uses weakreferences, so it will not prevent collection of objects simply because theobject is connected to a Signal.
This pattern is useful for an event system, entity communication, gui systems,or any other system that needs objects to communicate without tight coupling.
See also PyDispatcher, amore fully developed version of the same thing.
The signal.signal function allows defining custom handlers to be executed when a signal is received. A small number of default handlers are installed: SIGPIPE is ignored (so write errors on pipes and sockets can be reported as ordinary Python exceptions) and SIGINT is translated into a KeyboardInterrupt exception if the parent process has not changed it. Basically, connecting two signals is a simplified version of connecting a signal and a slot, while the slot is meant to emit another signal. As for priority, the slot(s) of the latter signal will be handled when the event loop is returned to the object. However, it is impossible to connect two slots because the mechanism requires a signal while.
A simple implementation of the Signal/Slot pattern. I originally uploaded this to ASPN's python cookbook in 2005. To use, simply create a Signal instance and connect() methods, which act as the 'slot' in this design pattern. The instance of signal is self-sufficient; it doesn't have to be a memberof a class. Connect slots to the signal using the 'connect()' method. The slot may be a member of a class or a simple function. Signal uses weakreferences, so it will not prevent collection of objects simply because theobject is connected to a Signal.
This pattern is useful for an event system, entity communication, gui systems,or any other system that needs objects to communicate without tight coupling.
See also PyDispatcher, amore fully developed version of the same thing.
The signal.signal function allows defining custom handlers to be executed when a signal is received. A small number of default handlers are installed: SIGPIPE is ignored (so write errors on pipes and sockets can be reported as ordinary Python exceptions) and SIGINT is translated into a KeyboardInterrupt exception if the parent process has not changed it. Basically, connecting two signals is a simplified version of connecting a signal and a slot, while the slot is meant to emit another signal. As for priority, the slot(s) of the latter signal will be handled when the event loop is returned to the object. However, it is impossible to connect two slots because the mechanism requires a signal while.
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But user-defined slots in PyQt can be any python callable object, and it doesn't matter if the signature doesn't match (any extra parameters will be thrown away). Having said that, an explicit signature can be defined for a user-defined slot by using the pyqtSlot decorator (which therefore allows multiple overloads to be specified in PyQt).
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