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113 lines
3.6 KiB
Rust
113 lines
3.6 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use crate::context::LayoutContext;
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use crate::dom_traversal::{Contents, NodeExt};
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use crate::flow::BlockFormattingContext;
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use crate::fragments::Fragment;
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use crate::positioned::AbsolutelyPositionedFragment;
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use crate::replaced::ReplacedContent;
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use crate::sizing::ContentSizes;
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use crate::style_ext::DisplayInside;
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use crate::ContainingBlock;
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use servo_arc::Arc;
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use std::convert::TryInto;
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use style::properties::ComputedValues;
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use style::values::computed::Length;
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/// https://drafts.csswg.org/css-display/#independent-formatting-context
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#[derive(Debug)]
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pub(crate) struct IndependentFormattingContext {
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pub style: Arc<ComputedValues>,
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/// If it was requested during construction
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pub inline_content_sizes: Option<ContentSizes>,
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contents: IndependentFormattingContextContents,
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}
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pub(crate) struct IndependentLayout {
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pub fragments: Vec<Fragment>,
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pub content_block_size: Length,
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}
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// Private so that code outside of this module cannot match variants.
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// It should got through methods instead.
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#[derive(Debug)]
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enum IndependentFormattingContextContents {
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Flow(BlockFormattingContext),
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// Not called FC in specs, but behaves close enough
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Replaced(ReplacedContent),
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// Other layout modes go here
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}
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pub(crate) struct NonReplacedIFC<'a>(NonReplacedIFCKind<'a>);
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enum NonReplacedIFCKind<'a> {
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Flow(&'a BlockFormattingContext),
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}
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impl IndependentFormattingContext {
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pub fn construct<'dom>(
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context: &LayoutContext,
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style: Arc<ComputedValues>,
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display_inside: DisplayInside,
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contents: Contents<impl NodeExt<'dom>>,
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request_content_sizes: bool,
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) -> Self {
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use self::IndependentFormattingContextContents as Contents;
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let (contents, inline_content_sizes) = match contents.try_into() {
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Ok(non_replaced) => match display_inside {
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DisplayInside::Flow | DisplayInside::FlowRoot => {
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let (bfc, content_sizes) = BlockFormattingContext::construct(
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context,
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&style,
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non_replaced,
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request_content_sizes,
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);
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(Contents::Flow(bfc), content_sizes)
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},
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},
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Err(replaced) => {
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let content_sizes = None; // Unused by layout code
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(Contents::Replaced(replaced), content_sizes)
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},
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};
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Self {
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style,
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contents,
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inline_content_sizes,
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}
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}
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pub fn as_replaced(&self) -> Result<&ReplacedContent, NonReplacedIFC> {
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use self::IndependentFormattingContextContents as Contents;
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use self::NonReplacedIFC as NR;
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use self::NonReplacedIFCKind as Kind;
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match &self.contents {
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Contents::Replaced(r) => Ok(r),
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Contents::Flow(f) => Err(NR(Kind::Flow(f))),
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}
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}
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}
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impl<'a> NonReplacedIFC<'a> {
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pub fn layout(
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&self,
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layout_context: &LayoutContext,
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containing_block: &ContainingBlock,
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tree_rank: usize,
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absolutely_positioned_fragments: &mut Vec<AbsolutelyPositionedFragment<'a>>,
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) -> IndependentLayout {
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match &self.0 {
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NonReplacedIFCKind::Flow(bfc) => bfc.layout(
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layout_context,
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containing_block,
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tree_rank,
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absolutely_positioned_fragments,
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),
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}
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}
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}
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