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style: Document the restyle hints code, and make it operate on TElement.

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This removes the annoying constraint of having to provide the current state from
outside of the restyle hints code.
This commit is contained in:
Emilio Cobos Álvarez 2017-01-01 23:53:34 +01:00
parent c5f2142d8f
commit fa8874fb14
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4 changed files with 101 additions and 53 deletions
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14
components/style/stylist.rs
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@ -8,8 +8,7 @@
use {Atom, LocalName};
use data::ComputedStyle;
use dom::PresentationalHintsSynthetizer;
use element_state::*;
use dom::{PresentationalHintsSynthetizer, TElement};
use error_reporting::StdoutErrorReporter;
use keyframes::KeyframesAnimation;
use media_queries::{Device, MediaType};
@ -662,16 +661,11 @@ impl Stylist {
/// restyle we need to do.
pub fn compute_restyle_hint<E>(&self,
element: &E,
snapshot: &Snapshot,
// NB: We need to pass current_state as an argument because
// selectors::Element doesn't provide access to ElementState
// directly, and computing it from the ElementState would be
// more expensive than getting it directly from the caller.
current_state: ElementState)
snapshot: &Snapshot)
-> RestyleHint
where E: ElementExt + Clone,
where E: TElement,
{
self.state_deps.compute_hint(element, snapshot, current_state)
self.state_deps.compute_hint(element, snapshot)
}
}