IsFocused inconsistent on Chrome

[tinne26]

Ebitengine Version

2.8.8

Operating System

• Windows
• macOS
• Linux
• FreeBSD
• OpenBSD
• Android
• iOS
• Nintendo Switch
• PlayStation 5
• Xbox
• Web Browsers

Go Version (go version)

1.24.0

What steps will reproduce the problem?

When moving to a different tab on Chrome ebiten.IsFocused() will often continue to return true.

What is the expected result?

ebiten.IsFocused() should properly change value when changing tabs (including CTRL+TAB, CTRL+Prev/NextPage and similar shortcuts).

What happens instead?

Sometimes manually opening a new tab will detect the focus change, but in most cases the focus change won't be detected. Waiting doesn't seem to help.

Anything else you feel useful to add?

On Firefox this seems to work properly, consistently.

[hajimehoshi]

Please provide steps to reproduce the issue.

[tinne26]

I edited the issue to explain it more clearly, but it's only the results of ebiten.IsFocused(); there's no meaningful additional code or program logic that I can provide.

[hajimehoshi]

ebiten.IsFocused() should properly change value when changing tabs (including CTRL+TAB, CTRL+Prev/NextPage and similar shortcuts).

I'm not sure this is true. Can a tab know such an outside world (e.g. whether a browser itself is focused or not)?

[tinne26]

Well, there's one issue that should be mentioned explicitly here:

• On desktop, there's no ambiguity about IsFocused(): the game being focused or not matches the window focus.
• For browsers, though, one could argue that IsFocused() can refer to the browser window, to the browser tab in which the game plays, or to the element itself being in focus.

I don't have any specific opinion regarding which definition of IsFocused() should be applied for browsers, but I think it should be as consistent as reasonably possible among them. This issue points out that with Firefox IsFocused() consistently acts as "we are in the game's tab", while for Chrome tab changes are not generally detected.

[hajimehoshi]

This issue points out that with Firefox IsFocused() consistently acts as "we are in the game's tab", while for Chrome tab changes are not generally detected.

So this seems like a browser's implementation issue and there might be nothing we can do unfortunately. I might miss some Web APIs. If you could find an approprite Web API, I'd be happy to do experiments.