titlebar background opacity

[zzhaolei]

Ghostty has already implemented title bar transparency. I don’t fully understand Swift, and I’m not sure whether its implementation differs from Kitty’s. But I’d like to ask if we could take inspiration from it to overcome the titlebar limitation?

macos_titlebar_color

WARNING: This option works by using a hack when arbitrary color (or background) is configured, as there is no proper Cocoa API for it

[kovidgoyal]

On Fri, Aug 15, 2025 at 07:58:36PM -0700, zhaolei wrote: Ghostty has already implemented title bar transparency. I don’t fully understand Swift, and I’m not sure whether its implementation differs from Kitty’s. But I’d like to ask if we could take inspiration from it to overcome the titlebar limitation?

Sure, feel free to send a PR. IIRC, you dont need to look at ghostty, what it needs is a new option in hide_window_decorations like titlebar-transparent or something. Then implement that option in glfwCocoaSetWindowChrome, see titlebar_transparent.

[zzhaolei]

I gave it a try, but the title bar remains fully transparent without showing the background color.😑

[kovidgoyal]

On Sat, Aug 16, 2025 at 01:06:57AM -0700, zhaolei wrote: I gave it a try, but the title bar remains fully transparent without showing the background color.😑

No clue, then. You will need to experiment with Cocoa APIs

[zzhaolei]

I did it. But there are still slight inconsistencies in the title bar.

[zzhaolei]

Now the color difference is very very subtle, I think this is a ready version.

[zzhaolei]

Resolved by PR #8906.