How can i send a signal from one component to another component?

Here I want to send a signal from A component to B component as soon as something happen in A component. And B component can repaint() or call some functions.
I would appreciate it if anyone can give me some advices,. Many thanks!

I would suggest having a look at either Listeners or ValueTrees. Both can accomplish what you’re asking. Check out the tutorial… : or there is a great video tutorial here:

Failing that, there is always carrier pigeon


Ok , thank you very much, I will try your way :grinning: