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LibWeb: Implement VisualViewport aware viewport scrolling

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Implements spec algorithm for viewport scrolling that first checks if
it's possible to use delta to move the visual viewport before falling
back to scrolling the layout viewport. This is a part of pinch-to-zoom
support.
This commit is contained in:
Aliaksandr Kalenik 2025-10-09 16:56:58 +02:00 • committed by Alexander Kalenik
parent 7ba34e8bd1
commit b477c6bfc4
Notes: github-actions[bot] 2025-10-10 13:39:33 +00:00
5 changed files with 82 additions and 19 deletions
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Libraries/LibWeb/Page/EventHandler.cpp
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@ -438,7 +438,7 @@ EventResult EventHandler::handle_mousewheel(CSSPixelPoint viewport_position, CSS
auto page_offset = compute_mouse_event_page_offset(viewport_position);
auto offset = compute_mouse_event_offset(page_offset, *layout_node->first_paintable());
if (node->dispatch_event(UIEvents::WheelEvent::create_from_platform_event(node->realm(), m_navigable->active_window_proxy(), UIEvents::EventNames::wheel, screen_position, page_offset, viewport_position, offset, wheel_delta_x, wheel_delta_y, button, buttons, modifiers).release_value_but_fixme_should_propagate_errors())) {
m_navigable->active_window()->scroll_by(wheel_delta_x, wheel_delta_y);
m_navigable->scroll_viewport_by_delta({ wheel_delta_x, wheel_delta_y });
}
handled_event = EventResult::Handled;