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layout: Check flow descendants of inline block fragments to find their

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baselines when aligning inline fragments per CSS 2.1 § 10.8.1.
This commit is contained in:
Patrick Walton 2016-04-27 12:44:43 -07:00
parent 8823f87276
commit 04f05349b1
6 changed files with 191 additions and 65 deletions
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44
components/layout/flow.rs
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@ -512,6 +512,8 @@ pub trait ImmutableFlowUtils {
/// Returns true if floats might flow through this flow, as determined by the float placement
/// speculation pass.
fn floats_might_flow_through(self) -> bool;
fn baseline_offset_of_last_line_box_in_flow(self) -> Option<Au>;
}
pub trait MutableFlowUtils {
@ -634,45 +636,48 @@ bitflags! {
#[doc = "Whether this flow must have its own layer. Even if this flag is not set, it might"]
#[doc = "get its own layer if it's deemed to be likely to overlap flows with their own"]
#[doc = "layer."]
const NEEDS_LAYER = 0b0000_0000_0000_0010_0000,
const NEEDS_LAYER = 0b0000_0000_0000_0000_0010_0000,
#[doc = "Whether this flow is absolutely positioned. This is checked all over layout, so a"]
#[doc = "virtual call is too expensive."]
const IS_ABSOLUTELY_POSITIONED = 0b0000_0000_0000_0100_0000,
const IS_ABSOLUTELY_POSITIONED = 0b0000_0000_0000_0000_0100_0000,
#[doc = "Whether this flow clears to the left. This is checked all over layout, so a"]
#[doc = "virtual call is too expensive."]
const CLEARS_LEFT = 0b0000_0000_0000_1000_0000,
const CLEARS_LEFT = 0b0000_0000_0000_0000_1000_0000,
#[doc = "Whether this flow clears to the right. This is checked all over layout, so a"]
#[doc = "virtual call is too expensive."]
const CLEARS_RIGHT = 0b0000_0000_0001_0000_0000,
const CLEARS_RIGHT = 0b0000_0000_0000_0001_0000_0000,
#[doc = "Whether this flow is left-floated. This is checked all over layout, so a"]
#[doc = "virtual call is too expensive."]
const FLOATS_LEFT = 0b0000_0000_0010_0000_0000,
const FLOATS_LEFT = 0b0000_0000_0000_0010_0000_0000,
#[doc = "Whether this flow is right-floated. This is checked all over layout, so a"]
#[doc = "virtual call is too expensive."]
const FLOATS_RIGHT = 0b0000_0000_0100_0000_0000,
const FLOATS_RIGHT = 0b0000_0000_0000_0100_0000_0000,
#[doc = "Text alignment. \
NB: If you update this, update `TEXT_ALIGN_SHIFT` below."]
const TEXT_ALIGN = 0b0000_0111_1000_0000_0000,
const TEXT_ALIGN = 0b0000_0000_0111_1000_0000_0000,
#[doc = "Whether this flow has a fragment with `counter-reset` or `counter-increment` \
styles."]
const AFFECTS_COUNTERS = 0b0000_1000_0000_0000_0000,
const AFFECTS_COUNTERS = 0b0000_0000_1000_0000_0000_0000,
#[doc = "Whether this flow's descendants have fragments that affect `counter-reset` or \
`counter-increment` styles."]
const HAS_COUNTER_AFFECTING_CHILDREN = 0b0001_0000_0000_0000_0000,
const HAS_COUNTER_AFFECTING_CHILDREN = 0b0000_0001_0000_0000_0000_0000,
#[doc = "Whether this flow behaves as though it had `position: static` for the purposes \
of positioning in the inline direction. This is set for flows with `position: \
static` and `position: relative` as well as absolutely-positioned flows with \
unconstrained positions in the inline direction."]
const INLINE_POSITION_IS_STATIC = 0b0010_0000_0000_0000_0000,
const INLINE_POSITION_IS_STATIC = 0b0000_0010_0000_0000_0000_0000,
#[doc = "Whether this flow behaves as though it had `position: static` for the purposes \
of positioning in the block direction. This is set for flows with `position: \
static` and `position: relative` as well as absolutely-positioned flows with \
unconstrained positions in the block direction."]
const BLOCK_POSITION_IS_STATIC = 0b0100_0000_0000_0000_0000,
const BLOCK_POSITION_IS_STATIC = 0b0000_0100_0000_0000_0000_0000,
/// Whether any ancestor is a fragmentation container
const CAN_BE_FRAGMENTED = 0b1000_0000_0000_0000_0000,
const CAN_BE_FRAGMENTED = 0b0000_1000_0000_0000_0000_0000,
/// Whether this flow contains any text and/or replaced fragments.
const CONTAINS_TEXT_OR_REPLACED_FRAGMENTS = 0b0001_0000_0000_0000_0000_0000,
}
}
@ -1387,6 +1392,21 @@ impl<'a> ImmutableFlowUtils for &'a Flow {
}
self.as_block().formatting_context_type() == FormattingContextType::None
}
fn baseline_offset_of_last_line_box_in_flow(self) -> Option<Au> {
for kid in base(self).children.iter().rev() {
if kid.is_inline_flow() {
return kid.as_inline().baseline_offset_of_last_line()
}
if kid.is_block_like() &&
kid.as_block().formatting_context_type() == FormattingContextType::None {
if let Some(baseline_offset) = kid.baseline_offset_of_last_line_box_in_flow() {
return Some(base(kid).position.start.b + baseline_offset)
}
}
}
None
}
}
impl<'a> MutableFlowUtils for &'a mut Flow {