Is there anyway to get focus in/out event (DECSET 1004) when hovering in/out from compositor background? (atleast in panel kitten mode)

[codelif]

Focus In/Out events (DECSET 1004) are emitted correctly when focusing from window to window.

But they are not emitted when hovering mouse from window to compositor background (see video)

I presume this is not a bug since this is the expected behavior for normal windows. But is this possible for panel kittens (with on-demand focus policy)?
Waybar in layer-shell is able to get those events (see video)

demo.mp4

I have tested this in Hyprland and Sway.

[kovidgoyal]

Any focus events received from the compositor will be forwarded to applications as far as I know. Run with --debug-input and check if the compositor is actually delivering keyboard leave for your use case. Note that just moving the mouse around doesn't typically change keyboard focus unless you have enabled some kind of focus follows mouse setting in your compositor. Although I am not sure if the panel kitten supports --debug-input or only --debug-rendering. It is a trivial patch to add --debug-input to it as well.

[codelif]

kitty seems to be getting those events from the compositor. Just not sending 1004s...

demo.mp4

[codelif]

these seem not to be keyboard focus event (which is the usecase of DECSET 1004) but rather Mouse Focus, does kitty report these through any protocol?

[kovidgoyal]

there is no such thing as mouse focus. Only keyboards have focus. a mouse event will go to whichever window the mouse is over when you click it.

[codelif]

I am referring to these:

[3.740] Mouse cursor left window: 1
[5.454] Mouse cursor entered window: 1 at 480.726562x450.230469

when cursor leaves or enters the window

[codelif]

is there any protocol through which kitty reports these Mouse cursor left window/Mouse cursor entered window events?

[kovidgoyal]

No, there is no such protocol. terminal programs dont have such a concept.

[codelif]

That sucks. Makes it impossible to determine whether a cell (at the edge of window) is being hovered or the mouse has wandered away.

Would you be open to a patch implementing this? If yes, any suggestions for where to start? And specifics of the protocol? (like if it can be incorporated in an existing protocol, or a new one)

[kovidgoyal]

4d3bbd8

[codelif]

Love you sir 😭