style/invalidation/
viewport_units.rs

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
7use crate::data::ViewportUnitUsage;
8use crate::dom::{TElement, TNode};
9use crate::invalidation::element::restyle_hints::RestyleHint;
10
11/// Invalidates style of all elements that depend on viewport units.
12///
13/// Returns whether any element was invalidated.
14pub fn invalidate<E>(root: E) -> bool
15where
16    E: TElement,
17{
18    debug!("invalidation::viewport_units::invalidate({:?})", root);
19    invalidate_recursively(root)
20}
21
22fn invalidate_recursively<E>(element: E) -> bool
23where
24    E: TElement,
25{
26    let mut data = match element.mutate_data() {
27        Some(data) => data,
28        None => return false,
29    };
30
31    if data.hint.will_recascade_subtree() {
32        debug!("invalidate_recursively: {:?} was already invalid", element);
33        return false;
34    }
35
36    let usage = data.styles.viewport_unit_usage();
37    let uses_viewport_units = usage != ViewportUnitUsage::None;
38    if uses_viewport_units {
39        debug!(
40            "invalidate_recursively: {:?} uses viewport units {:?}",
41            element, usage
42        );
43    }
44
45    match usage {
46        ViewportUnitUsage::None => {},
47        ViewportUnitUsage::FromQuery => {
48            data.hint.insert(RestyleHint::RESTYLE_SELF);
49        },
50        ViewportUnitUsage::FromDeclaration => {
51            data.hint.insert(RestyleHint::RECASCADE_SELF);
52        },
53    }
54
55    let mut any_children_invalid = false;
56    for child in element.traversal_children() {
57        if let Some(child) = child.as_element() {
58            any_children_invalid |= invalidate_recursively(child);
59        }
60    }
61
62    if any_children_invalid {
63        debug!(
64            "invalidate_recursively: Children of {:?} changed, setting dirty descendants",
65            element
66        );
67        unsafe { element.set_dirty_descendants() }
68    }
69
70    uses_viewport_units || any_children_invalid
71}
style/invalidation/viewport_units.rs

style/invalidation/
viewport_units.rs
