macOS trackpad pinch zoom on Safari is not working

[moklick]

Hey!

I can not use pinch zoom on a macbook trackpad on Safari. The issue is reproducible with this example: https://observablehq.com/@d3/delaunay-find-zoom?collection=@d3/d3-zoom

It seems that Safari is not using event.ctrlKey + event.type === 'wheel' for identifying a pinch zoom but uses gesturestart, gesturechange and gestureend. Are you planing to implement listeners for these events or should we implement them on our own?

[Fil]

Thanks for the report. Yes, we would want to implement this — contributions are welcome.

[moklick]

Thanks for the fast reply! I'm not sure if I can help here but I'll look into it.

[Richard-Mlynarik]

Looks like https://github.com/antimatter15/d3-pinch-zoom was an attempt at this.