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Make "align descendants" rule use parent's text-align.

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Flows never care about their own text-align, only the text-align of
their parent; change the text-align flags to account for that.  Make the
"align descendants" rule use the flags instead of the current node's style.

Fixes #7301.
This commit is contained in:
Eli Friedman 2015-10-02 12:53:43 -07:00
parent 69ca066802
commit a31461bad9
2 changed files with 4 additions and 21 deletions
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12
components/layout/block.rs
View file

@ -1466,8 +1466,9 @@ impl BlockFlow {
// Per CSS 2.1 § 16.3.1, text alignment propagates to all children in flow.
//
// TODO(#2018, pcwalton): Do this in the cascade instead.
flow::mut_base(kid).flags.propagate_text_alignment_from_parent(flags.clone());
// TODO(#2265, pcwalton): Do this in the cascade instead.
let containing_block_text_align = self.fragment.style().get_inheritedtext().text_align;
flow::mut_base(kid).flags.set_text_align(containing_block_text_align);
// Handle `text-indent` on behalf of any inline children that we have. This is
// necessary because any percentages are relative to the containing block, which only
@ -2276,9 +2277,6 @@ pub trait ISizeAndMarginsComputer {
(_, box_sizing::T::content_box) => {}
}
// The text alignment of a block flow is the text alignment of its box's style.
block.base.flags.set_text_align(style.get_inheritedtext().text_align);
let margin = style.logical_margin();
let position = style.logical_position();
@ -2442,6 +2440,7 @@ pub trait ISizeAndMarginsComputer {
// Check for direction of parent flow (NOT Containing Block)
let block_mode = block.base.writing_mode;
let container_mode = block.base.block_container_writing_mode;
let block_align = block.base.flags.text_align();
// FIXME (mbrubeck): Handle vertical writing modes.
let parent_has_same_direction = container_mode.is_bidi_ltr() == block_mode.is_bidi_ltr();
@ -2472,9 +2471,6 @@ pub trait ISizeAndMarginsComputer {
MaybeAuto::Specified(margin_end)) => {
// servo_left, servo_right, and servo_center are used to implement
// the "align descendants" rule in HTML5 § 14.2.
// FIXME(#7301): block_align is supposed to be the text-align of the
// parent, not the current node.
let block_align = input.text_align;
if block_align == text_align::T::servo_center {
// Ignore any existing margins, and make the inline-start and
// inline-end margins equal.

13
components/layout/flow.rs
View file

@ -655,14 +655,6 @@ static HAS_FLOATED_DESCENDANTS_BITMASK: FlowFlags = FlowFlags { bits: 0b0000_001
static TEXT_ALIGN_SHIFT: usize = 11;
impl FlowFlags {
/// Propagates text alignment flags from an appropriate parent flow per CSS 2.1.
///
/// FIXME(#2265, pcwalton): It would be cleaner and faster to make this a derived CSS property
/// `-servo-text-align-in-effect`.
pub fn propagate_text_alignment_from_parent(&mut self, parent_flags: FlowFlags) {
self.set_text_align_override(parent_flags);
}
#[inline]
pub fn text_align(self) -> text_align::T {
text_align::T::from_u32((self & TEXT_ALIGN).bits() >> TEXT_ALIGN_SHIFT).unwrap()
@ -674,11 +666,6 @@ impl FlowFlags {
FlowFlags::from_bits(value.to_u32() << TEXT_ALIGN_SHIFT).unwrap();
}
#[inline]
pub fn set_text_align_override(&mut self, parent: FlowFlags) {
self.insert(parent & TEXT_ALIGN);
}
#[inline]
pub fn union_floated_descendants_flags(&mut self, other: FlowFlags) {
self.insert(other & HAS_FLOATED_DESCENDANTS_BITMASK);