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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
//! Invalidates style of all elements that depend on viewport units.
use crate::data::ViewportUnitUsage;
use crate::dom::{TElement, TNode};
use crate::invalidation::element::restyle_hints::RestyleHint;
/// Invalidates style of all elements that depend on viewport units.
///
/// Returns whether any element was invalidated.
pub fn invalidate<E>(root: E) -> bool
where
E: TElement,
{
debug!("invalidation::viewport_units::invalidate({:?})", root);
invalidate_recursively(root)
}
fn invalidate_recursively<E>(element: E) -> bool
where
E: TElement,
{
let mut data = match element.mutate_data() {
Some(data) => data,
None => return false,
};
if data.hint.will_recascade_subtree() {
debug!("invalidate_recursively: {:?} was already invalid", element);
return false;
}
let usage = data.styles.viewport_unit_usage();
let uses_viewport_units = usage != ViewportUnitUsage::None;
if uses_viewport_units {
debug!(
"invalidate_recursively: {:?} uses viewport units {:?}",
element, usage
);
}
match usage {
ViewportUnitUsage::None => {},
ViewportUnitUsage::FromQuery => {
data.hint.insert(RestyleHint::RESTYLE_SELF);
},
ViewportUnitUsage::FromDeclaration => {
data.hint.insert(RestyleHint::RECASCADE_SELF);
},
}
let mut any_children_invalid = false;
for child in element.traversal_children() {
if let Some(child) = child.as_element() {
any_children_invalid |= invalidate_recursively(child);
}
}
if any_children_invalid {
debug!(
"invalidate_recursively: Children of {:?} changed, setting dirty descendants",
element
);
unsafe { element.set_dirty_descendants() }
}
uses_viewport_units || any_children_invalid
}
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