[GH-ISSUE #355] Question about Pages.SetChangedFunc() callback #265

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opened 2026-03-04 01:03:28 +03:00 by kerem · 2 comments

kerem commented

2026-03-04 01:03:28 +03:00

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Originally created by @pktgen on GitHub (Oct 17, 2019).
Original GitHub issue: https://github.com/rivo/tview/issues/355

When I set the callback I do get the callback when a page changes focus. My question is what can I do with the callback as I do not seem to have any context as to what page changed. It seems like the callback should be passing in a values(s) to allows some action based on the change. Maybe I am using it wrong.

Here is what I want to do and maybe you can suggest a different approach.

I have say three pages '1', '2' and '3' using the keyboard numbers to switch pages. When I am on page '3' then press '1' to bring up page '1' I would like page '3' get a callback to shutdown or release resources.

Any suggestions?

Originally created by @pktgen on GitHub (Oct 17, 2019). Original GitHub issue: https://github.com/rivo/tview/issues/355 When I set the callback I do get the callback when a page changes focus. My question is what can I do with the callback as I do not seem to have any context as to what page changed. It seems like the callback should be passing in a values(s) to allows some action based on the change. Maybe I am using it wrong. Here is what I want to do and maybe you can suggest a different approach. I have say three pages '1', '2' and '3' using the keyboard numbers to switch pages. When I am on page '3' then press '1' to bring up page '1' I would like page '3' get a callback to shutdown or release resources. Any suggestions?

kerem closed this issue

2026-03-04 01:03:28 +03:00

kerem commented

2026-03-04 01:03:29 +03:00

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@Bios-Marcel commented on GitHub (Oct 17, 2019):

Could still access the Pages struct from within the callback. That's what I'd at least.

@Bios-Marcel commented on GitHub (Oct 17, 2019): Could still access the Pages struct from within the callback. That's what I'd at least.

kerem commented

2026-03-04 01:03:29 +03:00

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@rivo commented on GitHub (Oct 18, 2019):

Multiple pages can be visible at the same time so there is not really one page that I could supply to that "changed" callback. But you are right in that Pages doesn't provide many functions to inspect its current state. To make your example easier, I added a function GetFrontPage() which should solve your problem. Let me know if this helps.

@rivo commented on GitHub (Oct 18, 2019): Multiple pages can be visible at the same time so there is not really *one* page that I could supply to that "changed" callback. But you are right in that `Pages` doesn't provide many functions to inspect its current state. To make your example easier, I added a function [`GetFrontPage()`](https://godoc.org/github.com/rivo/tview#Pages.GetFrontPage) which should solve your problem. Let me know if this helps.