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Adds Callback Reason to FAQ on Fl_Window::callback

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This commit is contained in:
Matthias Melcher 2023-11-22 22:31:59 +01:00
parent f8d915cfe6
commit 8041a62e59
1 changed files with 13 additions and 0 deletions
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documentation/src/faq.dox
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@ -131,6 +131,19 @@ void my_callback(Fl_Widget*, void*) {
}
\endcode
The reason for calling a window callback can also be found using using the
`Fl::callback_reason()` method:
\code
void my_callback(Fl_Widget*, void*) {
if (Fl::callback_reason() == FL_REASON_CANCELLED)
return; // ignore that the user pressed the Escape key
if (Fl::callback_reason() == FL_REASON_CLOSED)
save_and_exit(); // user clicked the Close button in the window decoration
exit(0); // fallback for other callback reasons
}
\endcode
It is very common to ask for confirmation before exiting, this can be
done with: