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layout: Add basic support for getClientRects() queries (#31696)

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This adds basic support for `getClientRects()` by sharing code with the
implementation of `getBoundingClientRect()`. In addition to sharing
code, it also shares all of the bugs. Primarily, scrolilng positions are
not taken into account when return boundary rectangles.
This commit is contained in:
Martin Robinson 2024-03-15 18:20:47 +01:00 • committed by GitHub
parent 3f3820b3dc
commit 47a4ce467f
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GPG key ID: B5690EEEBB952194
15 changed files with 48 additions and 71 deletions
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35
components/layout_2020/fragment_tree/fragment_tree.rs
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@ -17,7 +17,7 @@ use super::{ContainingBlockManager, Fragment, Tag};
use crate::cell::ArcRefCell;
use crate::display_list::StackingContext;
use crate::flow::CanvasBackground;
use crate::geom::PhysicalRect;
use crate::geom::{physical_rect_to_au_rect, PhysicalRect};
#[derive(Serialize)]
pub struct FragmentTree {
@ -97,9 +97,13 @@ impl FragmentTree {
});
}
pub fn get_content_box_for_node(&self, requested_node: OpaqueNode) -> Option<Rect<Au>> {
let mut bounding_box = PhysicalRect::zero();
let mut found_any_nodes = false;
/// Get the vector of rectangles that surrounds the fragments of the node with the given address.
/// This function answers the `getClientRects()` query and the union of the rectangles answers
/// the `getBoundingClientRect()` query.
///
/// TODO: This function is supposed to handle scroll offsets, but that isn't happening at all.
pub fn get_content_boxes_for_node(&self, requested_node: OpaqueNode) -> Vec<Rect<Au>> {
let mut content_boxes = Vec::new();
let tag_to_find = Tag::new(requested_node);
self.find(|fragment, _, containing_block| {
if fragment.tag() != Some(tag_to_find) {
@ -121,27 +125,12 @@ impl FragmentTree {
Fragment::IFrame(_) => return None,
};
found_any_nodes = true;
bounding_box = fragment_relative_rect
.translate(containing_block.origin.to_vector())
.union(&bounding_box);
content_boxes.push(physical_rect_to_au_rect(
fragment_relative_rect.translate(containing_block.origin.to_vector()),
));
None::<()>
});
if found_any_nodes {
Some(Rect::new(
Point2D::new(
Au::from_f32_px(bounding_box.origin.x.px()),
Au::from_f32_px(bounding_box.origin.y.px()),
),
Size2D::new(
Au::from_f32_px(bounding_box.size.width.px()),
Au::from_f32_px(bounding_box.size.height.px()),
),
))
} else {
None
}
content_boxes
}
pub fn get_border_dimensions_for_node(&self, requested_node: OpaqueNode) -> Rect<i32> {