Currently I am using a ListView.builder to show items from a paginated API. Now I want to know which all items are visible on the screen? So that I can run certain logic for invisible items e.g unsubscribe live socket data for invisible items.
Why don’t you use stateful widgets (or watch_it) for your items? so you can use the initState and dispose function to do the subscribe / unsubscribe
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That’s actually a great idea! Let me try going that route.
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Invisible items are generally disposed when they scroll far enough out of the viewport. Your stream unsubscribe should be tied to dispose() for those widgets.
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Thanks for this advice! I implemented this approach and it worked great. But the only problem is, when I navigate back to another screen. Since I use context.read() in the dispose to make the socket call. The context is not available after sometime for obvious reasons.
So I applied the context.mounted check but in this case some calls won’t happen. Off course I can solve it by making a batch call to socket with all those elements which are still subscribed when the screen is disposed.
But do you think we can solve it another way?
I recommend using a service locator like get_it to access your socket then you don’t have to bother if the context still exists.
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Yeah that make sense! Since I use get_it(thanks for creating it 
) I will try that route as well. Thanks again 
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