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Thank you for your answer and thank you for TGUI !!

menu->connectMenuItem("File","Exit",[&]{ window.close(); });  works fine but
when i first posted this i was decifering the doc ( connectMenuItem() [1/2] )
and then i looked at ( connectMenuItem() [2/2] )  and left the correct answer in the post.

If anyone has more advices, please share !

Hello, i am trying to use tgui with opencv and sfml.

I managed to install them and i am now learning how to use them.

Since i'm a semi-beginner in c++, i don't know how to do some things but i want to learn.

for ex : I want to close the window when i click on a menu item.

I had trouble to write the hierarchy in menu->connectMenuItem("File","Exit",[&]{ window.close(); });

When i look at a documentation, some things are hard to get.

What do i need to learn to understand how to use tgui ?

I know i need at least to understand signals and lambda functions.

Can you tell me what other subjects i need to know about ?

Do you know any good sites or books ?