February 2019
Beginner
136 pages
3h 7m
English
Content preview from Getting Started with Qt 5
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Signals and slots
In Qt, this action-response scheme is handled by signals and slots. This section will include a few definitions, and then we shall jump into an example for further explanation.
A signal is a message that is passed to communicate that the state of an object has changed. This signal may carry information about the change that has occurred. For instance, when a window has been resized, the signal will usually carry the coordinates of the new state (or size) of the window. Sometimes, a signal may carry no extra information, such as that of a button click.
A slot is a specific function of an object that is called whenever a certain signal has been emitted. Since slots are functions, they will embody lines of code that perform ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.