   #home Signals and Callbacks What are Signals? Signal Inheritance

       Signals and Callbacks
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What are Callbacks?

   Callbacks are functions that are invoked when signals are emitted by
   widgets.

   Callbacks are functions that are set up by the programmer to react to
   signals emitted by widgets. You specify the function that should be
   called by connecting the function to the signal.

   The callback is also known as the signal handler function. This can be
   either the widget's default handler or a user-defined handler, that
   is, a function written by the programmer.
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