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Auto merge of #7825 - eefriedman:div-align, r=mbrubeck
Fully implement the "align descendants" rule for div. This adds -servo-left and -servo-right to complement -servo-center. ~~This intentionally doesn't try to address issue #7301.~~ Commit added to address #7301. <!-- Reviewable:start --> [<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/7825) <!-- Reviewable:end -->
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commit
ab42ca4296
9 changed files with 194 additions and 40 deletions
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@ -1466,8 +1466,9 @@ impl BlockFlow {
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// Per CSS 2.1 § 16.3.1, text alignment propagates to all children in flow.
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//
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// TODO(#2018, pcwalton): Do this in the cascade instead.
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flow::mut_base(kid).flags.propagate_text_alignment_from_parent(flags.clone());
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// TODO(#2265, pcwalton): Do this in the cascade instead.
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let containing_block_text_align = self.fragment.style().get_inheritedtext().text_align;
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flow::mut_base(kid).flags.set_text_align(containing_block_text_align);
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// Handle `text-indent` on behalf of any inline children that we have. This is
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// necessary because any percentages are relative to the containing block, which only
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@ -2272,9 +2273,6 @@ pub trait ISizeAndMarginsComputer {
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(_, box_sizing::T::content_box) => {}
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}
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// The text alignment of a block flow is the text alignment of its box's style.
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block.base.flags.set_text_align(style.get_inheritedtext().text_align);
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let margin = style.logical_margin();
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let position = style.logical_position();
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@ -2438,6 +2436,7 @@ pub trait ISizeAndMarginsComputer {
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// Check for direction of parent flow (NOT Containing Block)
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let block_mode = block.base.writing_mode;
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let container_mode = block.base.block_container_writing_mode;
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let block_align = block.base.flags.text_align();
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// FIXME (mbrubeck): Handle vertical writing modes.
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let parent_has_same_direction = container_mode.is_bidi_ltr() == block_mode.is_bidi_ltr();
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@ -2466,20 +2465,23 @@ pub trait ISizeAndMarginsComputer {
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(MaybeAuto::Specified(margin_start),
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MaybeAuto::Specified(inline_size),
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MaybeAuto::Specified(margin_end)) => {
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match (input.text_align, parent_has_same_direction) {
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(text_align::T::servo_center, _) => {
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// This is used for `<center>` and friends per HTML5 § 14.3.3. Make the
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// inline-start and inline-end margins equal per HTML5 § 14.2.
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let margin = (available_inline_size - inline_size).scale_by(0.5);
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(margin, inline_size, margin)
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}
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(_, true) => {
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// Ignore the end margin.
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// servo_left, servo_right, and servo_center are used to implement
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// the "align descendants" rule in HTML5 § 14.2.
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if block_align == text_align::T::servo_center {
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// Ignore any existing margins, and make the inline-start and
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// inline-end margins equal.
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let margin = (available_inline_size - inline_size).scale_by(0.5);
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(margin, inline_size, margin)
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} else {
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let ignore_end_margin = match block_align {
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text_align::T::servo_left => block_mode.is_bidi_ltr(),
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text_align::T::servo_right => !block_mode.is_bidi_ltr(),
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_ => parent_has_same_direction,
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};
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if ignore_end_margin {
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(margin_start, inline_size, available_inline_size -
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(margin_start + inline_size))
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}
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(_, false) => {
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// Ignore the start margin.
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} else {
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(available_inline_size - (margin_end + inline_size),
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inline_size,
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margin_end)
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@ -656,14 +656,6 @@ static HAS_FLOATED_DESCENDANTS_BITMASK: FlowFlags = FlowFlags { bits: 0b0000_001
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static TEXT_ALIGN_SHIFT: usize = 11;
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impl FlowFlags {
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/// Propagates text alignment flags from an appropriate parent flow per CSS 2.1.
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///
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/// FIXME(#2265, pcwalton): It would be cleaner and faster to make this a derived CSS property
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/// `-servo-text-align-in-effect`.
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pub fn propagate_text_alignment_from_parent(&mut self, parent_flags: FlowFlags) {
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self.set_text_align_override(parent_flags);
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}
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#[inline]
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pub fn text_align(self) -> text_align::T {
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text_align::T::from_u32((self & TEXT_ALIGN).bits() >> TEXT_ALIGN_SHIFT).unwrap()
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@ -675,11 +667,6 @@ impl FlowFlags {
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FlowFlags::from_bits(value.to_u32() << TEXT_ALIGN_SHIFT).unwrap();
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}
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#[inline]
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pub fn set_text_align_override(&mut self, parent: FlowFlags) {
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self.insert(parent & TEXT_ALIGN);
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}
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#[inline]
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pub fn union_floated_descendants_flags(&mut self, other: FlowFlags) {
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self.insert(other & HAS_FLOATED_DESCENDANTS_BITMASK);
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@ -1019,8 +1019,14 @@ impl InlineFlow {
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// Translate `left` and `right` to logical directions.
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let is_ltr = fragments.fragments[0].style().writing_mode.is_bidi_ltr();
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let line_align = match (line_align, is_ltr) {
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(text_align::T::left, true) | (text_align::T::right, false) => text_align::T::start,
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(text_align::T::left, false) | (text_align::T::right, true) => text_align::T::end,
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(text_align::T::left, true) |
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(text_align::T::servo_left, true) |
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(text_align::T::right, false) |
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(text_align::T::servo_right, false) => text_align::T::start,
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(text_align::T::left, false) |
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(text_align::T::servo_left, false) |
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(text_align::T::right, true) |
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(text_align::T::servo_right, true) => text_align::T::end,
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_ => line_align
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};
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@ -1040,7 +1046,10 @@ impl InlineFlow {
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inline_start_position_for_fragment = inline_start_position_for_fragment +
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slack_inline_size
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}
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text_align::T::left | text_align::T::right => unreachable!()
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text_align::T::left |
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text_align::T::servo_left |
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text_align::T::right |
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text_align::T::servo_right => unreachable!()
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}
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// Lay out the fragments in visual order.
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