mirror of
https://github.com/servo/servo.git
synced 2025-06-29 19:43:39 +01:00
100 lines
3.8 KiB
Rust
100 lines
3.8 KiB
Rust
/* 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 http://mozilla.org/MPL/2.0/. */
|
|
|
|
//! Misc information about a given computed style.
|
|
|
|
bitflags! {
|
|
/// Misc information about a given computed style.
|
|
///
|
|
/// All flags are currently inherited for text, pseudo elements, and
|
|
/// anonymous boxes, see StyleBuilder::for_inheritance and its callsites.
|
|
/// If we ever want to add some flags that shouldn't inherit for them,
|
|
/// we might want to add a function to handle this.
|
|
pub struct ComputedValueFlags: u16 {
|
|
/// Whether the style or any of the ancestors has a text-decoration-line
|
|
/// property that should get propagated to descendants.
|
|
///
|
|
/// text-decoration-line is a reset property, but gets propagated in the
|
|
/// frame/box tree.
|
|
const HAS_TEXT_DECORATION_LINES = 1 << 0;
|
|
|
|
/// Whether line break inside should be suppressed.
|
|
///
|
|
/// If this flag is set, the line should not be broken inside,
|
|
/// which means inlines act as if nowrap is set, <br> element is
|
|
/// suppressed, and blocks are inlinized.
|
|
///
|
|
/// This bit is propagated to all children of line participants.
|
|
/// It is currently used by ruby to make its content unbreakable.
|
|
const SHOULD_SUPPRESS_LINEBREAK = 1 << 1;
|
|
|
|
/// A flag used to mark text that that has text-combine-upright.
|
|
///
|
|
/// This is used from Gecko's layout engine.
|
|
const IS_TEXT_COMBINED = 1 << 2;
|
|
|
|
/// A flag used to mark styles under a relevant link that is also
|
|
/// visited.
|
|
const IS_RELEVANT_LINK_VISITED = 1 << 3;
|
|
|
|
/// A flag used to mark styles which are a pseudo-element or under one.
|
|
const IS_IN_PSEUDO_ELEMENT_SUBTREE = 1 << 4;
|
|
|
|
/// Whether this style inherits the `display` property.
|
|
///
|
|
/// This is important because it may affect our optimizations to avoid
|
|
/// computing the style of pseudo-elements, given whether the
|
|
/// pseudo-element is generated depends on the `display` value.
|
|
const INHERITS_DISPLAY = 1 << 6;
|
|
|
|
/// Whether this style inherits the `content` property.
|
|
///
|
|
/// Important because of the same reason.
|
|
const INHERITS_CONTENT = 1 << 7;
|
|
|
|
/// Whether the child explicitly inherits any reset property.
|
|
const INHERITS_RESET_STYLE = 1 << 8;
|
|
|
|
/// A flag to mark a style which is a visited style.
|
|
const IS_STYLE_IF_VISITED = 1 << 9;
|
|
|
|
/// Whether the style or any of the ancestors has a multicol style.
|
|
///
|
|
/// Only used in Servo.
|
|
const CAN_BE_FRAGMENTED = 1 << 10;
|
|
}
|
|
}
|
|
|
|
impl ComputedValueFlags {
|
|
/// Flags that are unconditionally propagated to descendants.
|
|
#[inline]
|
|
fn inherited_flags() -> Self {
|
|
ComputedValueFlags::IS_STYLE_IF_VISITED |
|
|
ComputedValueFlags::IS_RELEVANT_LINK_VISITED |
|
|
ComputedValueFlags::CAN_BE_FRAGMENTED |
|
|
ComputedValueFlags::IS_IN_PSEUDO_ELEMENT_SUBTREE |
|
|
ComputedValueFlags::HAS_TEXT_DECORATION_LINES
|
|
}
|
|
|
|
/// Flags that may be propagated to descendants.
|
|
#[inline]
|
|
fn maybe_inherited_flags() -> Self {
|
|
Self::inherited_flags() | ComputedValueFlags::SHOULD_SUPPRESS_LINEBREAK
|
|
}
|
|
|
|
/// Returns the flags that are always propagated to descendants.
|
|
///
|
|
/// See StyleAdjuster::set_bits and StyleBuilder.
|
|
#[inline]
|
|
pub fn inherited(self) -> Self {
|
|
self & Self::inherited_flags()
|
|
}
|
|
|
|
/// Flags that are conditionally propagated to descendants, just to handle
|
|
/// properly style invalidation.
|
|
#[inline]
|
|
pub fn maybe_inherited(self) -> Self {
|
|
self & Self::maybe_inherited_flags()
|
|
}
|
|
}
|