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layout: Implement overflow scroll support for different axes (#35414)

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* layout: Add AxesScrollSensitivity to enable control of scroll in axis

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* layout_2013: Be compatible with AxesScrollSensitivity

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* layout: update struct AxesScrollSensitivity to euclid::Vector2D

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* display_list: implement From<Overflow> for ScrollSensitivity

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* layout: simplify and reuse scroll related logic

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* layout_2013: simplify and reuse scroll related logic

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* layout, layout_2013: revert AxesScrollSensitivity to pair struct

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* layout: Reimport ComputedOverflow as #35103 depends on it

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* layout: Add AxesOverflow to replace PhysicalVec

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* layout: implement scroll of viewport for different axes

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* layout: explicitly handle overflow match

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* Update components/shared/webrender/Cargo.toml

Co-authored-by: Martin Robinson <mrobinson@igalia.com>
Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

---------

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Euclid Ye 2025-02-14 16:14:57 +08:00 • committed by GitHub
parent 9b3e23633d
commit 03fc54e682
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12 changed files with 111 additions and 63 deletions
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34
components/layout_2020/flow/root.rs
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@ -13,7 +13,7 @@ use style::dom::OpaqueNode;
use style::properties::ComputedValues;
use style::values::computed::Overflow;
use style_traits::CSSPixel;
use webrender_traits::display_list::ScrollSensitivity;
use webrender_traits::display_list::AxesScrollSensitivity;
use crate::cell::ArcRefCell;
use crate::context::LayoutContext;
@ -40,8 +40,8 @@ pub struct BoxTree {
/// <https://drafts.csswg.org/css-backgrounds/#special-backgrounds>
canvas_background: CanvasBackground,
/// Whether or not the root element should be sensitive to scrolling input events.
sensitive_to_scroll_input: bool,
/// Whether or not the viewport should be sensitive to scrolling input events in two axes
scroll_sensitivity: AxesScrollSensitivity,
}
impl BoxTree {
@ -54,7 +54,7 @@ impl BoxTree {
// Zero box for `:root { display: none }`, one for the root element otherwise.
assert!(boxes.len() <= 1);
// From https://drafts.csswg.org/css-overflow/#propdef-overflow:
// From https://drafts.csswg.org/css-overflow/#overflow-propagation:
// > UAs must apply the overflow-* values set on the root element to the viewport when the
// > root element’s display value is not none. However, when the root element is an [HTML]
// > html element (including XML syntax for HTML) whose overflow value is visible (in both
@ -62,12 +62,13 @@ impl BoxTree {
// > none, user agents must instead apply the overflow-* values of the first such child
// > element to the viewport. The element from which the value is propagated must then have a
// > used overflow value of visible.
//
// TODO: This should handle when different overflow is set multiple axes, which requires the
// compositor scroll tree to allow setting a value per axis.
let root_style = root_element.style(context);
let mut root_overflow = root_style.effective_overflow().y;
if root_overflow == Overflow::Visible && !root_style.get_box().display.is_none() {
let root_overflow = root_style.effective_overflow();
let mut viewport_overflow = root_overflow;
if root_overflow.x == Overflow::Visible &&
root_overflow.y == Overflow::Visible &&
!root_style.get_box().display.is_none()
{
for child in iter_child_nodes(root_element) {
if !child
.to_threadsafe()
@ -79,7 +80,7 @@ impl BoxTree {
let style = child.style(context);
if !style.get_box().display.is_none() {
root_overflow = style.effective_overflow().y;
viewport_overflow = style.effective_overflow();
break;
}
}
@ -93,7 +94,10 @@ impl BoxTree {
contains_floats,
},
canvas_background: CanvasBackground::for_root_element(context, root_element),
sensitive_to_scroll_input: root_overflow != Overflow::Hidden,
scroll_sensitivity: AxesScrollSensitivity {
x: viewport_overflow.x.to_scrollable().into(),
y: viewport_overflow.y.to_scrollable().into(),
},
}
}
@ -392,18 +396,12 @@ impl BoxTree {
acc.union(&child_overflow)
});
let root_scroll_sensitivity = if self.sensitive_to_scroll_input {
ScrollSensitivity::ScriptAndInputEvents
} else {
ScrollSensitivity::Script
};
FragmentTree {
root_fragments,
scrollable_overflow,
initial_containing_block: physical_containing_block,
canvas_background: self.canvas_background.clone(),
root_scroll_sensitivity,
root_scroll_sensitivity: self.scroll_sensitivity,
}
}
}