[Android Editor] Update the options for launching the Play window in PiP mode

[m4gr3d]

Follow-up from #95700 (comment)

This PR adds a new mode to launch the Play window directly in picture-in-picture (PiP) mode.

Screen_Recording_20240830_103034.mp4

[m4gr3d]

cc @arutemu

[arutemu]

@m4gr3d Thank you! PiP works like a charm :)

However, there is an issue that may be out of the scope of this exact change - the hardware controls (keyboard/gamepad) do not work with the game running in PiP mode.
To clarify - the same HW input works fine outside of PiP mode.

I understand that touch controls are not supposed to work in PiP mode, as stated in #95700.
But what about HW?
Is it some Android OS limitation, or may it be implemented? (or it works, just not on my side?..)
Device - Galaxy Tab S8, Android 14.

UPD.
It seems like HW controls actually do interact with the game running in PiP mode, however, not in the expected way.
Basically you can interact with the PiP window buttons (using arrow keys and enter, etc.)

[akien-mga]

Thanks!

@m4gr3d See above question about gamepad input. Should that be filed in a new issue?

[m4gr3d]

Is it some Android OS limitation, or may it be implemented? (or it works, just not on my side?..)

@arutemu @akien-mga I checked and it's an Android limitation. The content in the window running in PiP mode doesn't get any input events, the only exception being the PiP buttons used to restore full screen or close the PiP window, which matches the behavior you're seeing.

PiP mode was originally created for media watching while multi-tasking so those restrictions make sense in that context. Hopefully future versions of Android will expand the input capabilities for PiP windows.

[arutemu]

@m4gr3d than you for the reply!

It's a bit sad result, to be fair, as it makes PiP mode almost useless for any dynamic scenes.
However, it would still be quite useful for checking static scenes.

Just one more question - maybe there is some workaround for passing the HW inputs from the editor to the PiP window? Or any other way to update the game data?
Because, while the PiP window is quite limiting, there is an example of the app that is used not for media playback and that shows the real time changes - Google Maps (example here).

[Calinou]

Just one more question - maybe there is some workaround for passing the HW inputs from the editor to the PiP window? Or any other way to update the game data?

Something like this will be needed for embedding the game window within the editor. It shouldn't be too difficult to implement right now if all you need is input forwarding.

Touch and mouse motion events might be more difficult due to the captured and confined mouse modes, but keyboard and gamepad¹ should be straightforward.

Footnotes

1. On desktop platforms, unfocused windows always receive gamepad events, but this is not the case on Android as far as I can tell. ↩