1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5 //! Invalidates style of all elements that depend on viewport units.
6
7 use crate::dom::{TElement, TNode};
8 use crate::invalidation::element::restyle_hints::RestyleHint;
9
10 /// Invalidates style of all elements that depend on viewport units.
11 ///
12 /// Returns whether any element was invalidated.
invalidate<E>(root: E) -> bool where E: TElement,13 pub fn invalidate<E>(root: E) -> bool
14 where
15 E: TElement,
16 {
17 debug!("invalidation::viewport_units::invalidate({:?})", root);
18 invalidate_recursively(root)
19 }
20
invalidate_recursively<E>(element: E) -> bool where E: TElement,21 fn invalidate_recursively<E>(element: E) -> bool
22 where
23 E: TElement,
24 {
25 let mut data = match element.mutate_data() {
26 Some(data) => data,
27 None => return false,
28 };
29
30 if data.hint.will_recascade_subtree() {
31 debug!("invalidate_recursively: {:?} was already invalid", element);
32 return false;
33 }
34
35 let uses_viewport_units = data.styles.uses_viewport_units();
36 if uses_viewport_units {
37 debug!("invalidate_recursively: {:?} uses viewport units", element);
38 data.hint.insert(RestyleHint::RECASCADE_SELF);
39 }
40
41 let mut any_children_invalid = false;
42 for child in element.traversal_children() {
43 if let Some(child) = child.as_element() {
44 any_children_invalid |= invalidate_recursively(child);
45 }
46 }
47
48 if any_children_invalid {
49 debug!(
50 "invalidate_recursively: Children of {:?} changed, setting dirty descendants",
51 element
52 );
53 unsafe { element.set_dirty_descendants() }
54 }
55
56 uses_viewport_units || any_children_invalid
57 }
58