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Anthony Eid e39fb7c2e0 gpui: Rename ScrollWheelEvent to ScrollEvent and add trackpad scrolling on iOS (#65805) ... Scrolling in GPUI comes from mouse wheels and trackpads reported by the OS, and from touch pans that GPUI recognizes itself. All of them arrived as `ScrollWheelEvent`, and handlers had no way to tell a finger pan from anything else. ## API change - `ScrollWheelEvent` → `ScrollEvent`, with a new `source: ScrollSource` field. - `ScrollSource` has two variants: - `Pointer` (the default): a scroll the platform reported from a mouse wheel or trackpad. `ScrollDelta::precise()` still tells continuous devices apart from wheel notches. - `Touch`: a finger pan recognized by GPUI, including its synthesized momentum. - `on_scroll_wheel` → `on_scroll`. - `PlatformInput::ScrollWheel` → `PlatformInput::Scroll`. ### Compatibility Existing app code keeps compiling: `ScrollWheelEvent` and `on_scroll_wheel` remain as deprecated aliases. Two things still need changes: - Platform backends must switch to `PlatformInput::Scroll`. Rust can't alias an enum variant. - `ScrollEvent` literals that list every field must add `source`. Literals using `..Default::default()` get `ScrollSource::Pointer`. ## Trackpad and mouse-wheel scrolling on iOS `gpui_ios` previously handled only raw touches, so trackpads and mice on iPad couldn't scroll. The backend now adds a `UIPanGestureRecognizer` to the Metal view that accepts all scroll types and sends each step as a `ScrollEvent` with the pointer position and modifiers. The recognizer has an empty `allowedTouchTypes` and `cancelsTouchesInView = false`. That way it never claims finger touches, which keep going to `touchesBegan` and GPUI's touch recognizer. UIKit ends these gestures when the fingers lift and leaves momentum to the app. So for now a trackpad scroll on iOS stops when the fingers lift, without the post-release glide that native views have. ## Verification Done on Linux: - `cargo test -p gpui --features test-support --lib -- gestures list:: scroll`: 72 passed. - `./script/clippy -p gpui -p gpui_linux`: clean. - `cargo clippy` for `gpui_ios` (`aarch64-apple-ios`) and `gpui_macos` (`aarch64-apple-darwin`): clean. - `cargo check -p gpui_web` (`wasm32-unknown-unknown`): clean. - A temporary downstream-style test confirmed that code using `ScrollWheelEvent` and `.on_scroll_wheel(...)` still compiles and receives scrolls. Not verified: - **Windows:** wasn't type-checked locally, because `gpui`'s build script needs the Windows resource compiler. CI covers it. - **iOS behavior:** trackpad and wheel scrolling on an iPad hasn't been tried. Specifically unconfirmed: scroll direction under natural scrolling, and that finger pans don't also trigger the scroll recognizer. Release Notes: - [GPUI] Renamed `ScrollWheelEvent` to `ScrollEvent` and `on_scroll_wheel` to `on_scroll` (old names remain as deprecated aliases), added `ScrollEvent::source` to distinguish pointer scrolling from GPUI-recognized touch pans, and added trackpad and mouse-wheel scrolling on iOS --------- Co-authored-by: zed-zippy[bot] <234243425+zed-zippy[bot]@users.noreply.github.com>		2026-10-20 01:13:50 +00:00
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src	gpui: Rename ScrollWheelEvent to ScrollEvent and add trackpad scrolling on iOS (#65805)	2026-10-20 01:13:50 +00:00
Cargo.toml	Switch from cargo-machete to cargo-shear (#62643)	2026-08-20 10:08:48 +00:00
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