# SIGNAL: The connected function will be called whenever the window This slot function must accept the value sent by the signal (here the checked state) and then call the real slot, passing any additional data with the arguments. Instead use an intermediate function to intercept the signal, modify the signal data and forward that on to your actual slot function. Instead of connecting signal directly to the target function, you This is a powerful way to extend or modify the built-in signals provided by Qt. This could be the object the signal was triggered on, or some other associated metadata which your slot needs to perform the intended result of the signal. Sometimes however you need the slot function to know more than that QAction is giving it. ![]() You can tie a particular action to a unique function which does precisely what that action requires. The receiving function does not know which QAction triggered it, or receiving any other data about it. The triggered signal emits a single piece of data - the checked state of the action after being triggered.įor non-checkable actions, this value will always be False triggered that fires when that particular action has been activated. However, there is a limitation: the signal can only emit the data it was designed to. The receiving slot can use this data to perform different actions in response to the same signal. Many signals also transmit data, providing information about the state change or widget that fired them. Signals are connected to slots which are functions (or methods) which will be run every time the signal fires. ![]() Signals are a neat feature of Qt that allow you to pass messages between different components in your applications.
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