I want to add mouse binding support so that we can do things like ctrl+scroll up/down to zoom in/out

[carebare47]

What do you want to change?

Want to be able to zoom in/out using the mouse wheel (probably makes sense to add general mouse binding support while I'm there)

Why do you want to make this change?

Hi,

I'm a robotic systems architect with ~8 years SWE experience, although primarily in python/C++/ROS/robot systems (this is my first time interacting with zig)

I want to make this change as I'm trying to move away from terminator, really enjoying ghostty, and want to be able to zoom in/out using ctrl + mouse wheel

I've made a PR to my own fork if it helps to share this now: carebare47#1

It's an implementation of the discussion here

AI disclosure - I've used claude code heavily for this. I've been testing/editing/reviewing as we went. Happy to walk through any of the design decisions or code if that's useful. There's no AI disclosure in the PR to my own fork currently, I'll add that in to the PR description to ghostty-org/ghostty if I get vouched for

The OS I use is ubuntu 20.04, so for testing I've been building in a debian 13 container (for easier access to libgtk4-layer-shell-dev) with zig 0.15.2, then hacking that built binary back into this appimage so that I can test the resulting appimage on my ubuntu 20 install

I acknowledge that:

• I have read the Contributing Guide and understand the contribution process.
• I have read and agree to follow the AI Usage Policy.
• I wrote this vouch request myself, in my own voice, without AI generating it.

[Nickalus12]

Nice work on the Debian container/AppImage testing setup. I'd double-check that your app/gtk/input.zig logic handles GDK_SCROLL_SMOOTH deltas correctly, as raw scroll events can be jittery depending on the driver. If the zoom doesn't conflict with mouse-aware CLI apps (like vim), go ahead and open the PR and I'll take a look.

[carebare47]

great, thanks. Good point, I'll double check that and reply here when I'm done. Will likely be early next week

[Nickalus12]

Nice, glad that sorted it out! Glad that helped! If you could mark it as the answer, it makes this easier for the next person searching for the same problem.

[mitchellh]

Mouse binding syntax isn't approved yet, so we can approve a PR for it. Please add your thoughts to the associated discussion.

[00-kat]

Namely #3848.

[carebare47]

Thanks @mitchellh (and sorry for the slow response)
I've posted a syntax proposal over in #3848 here