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script: Move keyboard scrolling to script (#39371)

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Instead of having every single embedder implement keyboard scrolling,
handle it in script in the default key event handler. This allows
properly targeting the scroll events to their scroll containers as well
as appropriately sizing "page up" and "page down" scroll deltas.

This change means that when you use the keyboard to scroll, the focused
or most recently clicked `<iframe>` or overflow scroll container is
scrolled, rather than the main frame.

In addition, when a particular scroll frame is larger than its content
in the axis of the scroll, the scrolling operation is chained to
the parent (as in other browsers). One exception is for `<iframe>`s,
which will be implemented in a followup change.

Testing: automated tests runnable locally with `mach test-wpt --product
servodriver`

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
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shuppy 2025-09-24 04:35:08 +08:00 • committed by GitHub
parent 99fbd36b5d
commit ac8895c3ae
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19 changed files with 540 additions and 185 deletions
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2
ports/servoshell/desktop/window_trait.rs
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@ -17,6 +17,7 @@ use super::app_state::RunningAppState;
// This should vary by zoom level and maybe actual text size (focused or under cursor)
pub(crate) const LINE_HEIGHT: f32 = 76.0;
pub(crate) const LINE_WIDTH: f32 = 76.0;
// MouseScrollDelta::PixelDelta is default for MacOS, which is high precision and very slow
// in winit. Therefore we use a factor of 4.0 to make it more usable.
// See https://github.com/servo/servo/pull/34063#discussion_r2197729507
@ -31,7 +32,6 @@ pub trait WindowPortsMethods {
fn screen_geometry(&self) -> ScreenGeometry;
fn device_hidpi_scale_factor(&self) -> Scale<f32, DeviceIndependentPixel, DevicePixel>;
fn hidpi_scale_factor(&self) -> Scale<f32, DeviceIndependentPixel, DevicePixel>;
fn page_height(&self) -> f32;
fn get_fullscreen(&self) -> bool;
fn handle_winit_event(&self, state: Rc<RunningAppState>, event: winit::event::WindowEvent);
fn set_title(&self, _title: &str) {}