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layout: Implement text-indent per CSS 2.1 § 16.1.

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I had to use a somewhat unconventional method of computing text
indentation (propagating from blocks down to inlines) because of the way
containing blocks are handled in Servo.

(As a side note, neither Gecko nor WebKit correctly handles percentages
in `text-align`, at least incrementally -- i.e. when the percentages are
relative to the viewport and the viewport is resized.)
This commit is contained in:
Patrick Walton 2014-12-10 23:17:05 -08:00
parent 071d320728
commit caee309ef4
11 changed files with 173 additions and 28 deletions
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22
components/layout/block.rs
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@ -1256,6 +1256,7 @@ impl BlockFlow {
#[inline(always)]
pub fn propagate_assigned_inline_size_to_children(
&mut self,
layout_context: &LayoutContext,
inline_start_content_edge: Au,
content_inline_size: Au,
optional_column_computed_inline_sizes: Option<&[ColumnComputedInlineSize]>) {
@ -1306,6 +1307,13 @@ impl BlockFlow {
(LPA_Length(length), _) => Some(length),
};
// Calculate containing block inline size.
let containing_block_size = if flags.contains(IS_ABSOLUTELY_POSITIONED) {
self.containing_block_size(layout_context.shared.screen_size).inline
} else {
content_inline_size
};
for (i, kid) in self.base.child_iter().enumerate() {
{
let kid_base = flow::mut_base(kid);
@ -1383,7 +1391,16 @@ 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())
flow::mut_base(kid).flags.propagate_text_alignment_from_parent(flags.clone());
// 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
// we know.
if kid.is_inline_flow() {
kid.as_inline().first_line_indentation =
specified(self.fragment.style().get_inheritedtext().text_indent,
containing_block_size);
}
}
}
@ -1609,7 +1626,8 @@ impl Flow for BlockFlow {
let padding_and_borders = self.fragment.border_padding.inline_start_end();
let content_inline_size = self.fragment.border_box.size.inline - padding_and_borders;
self.propagate_assigned_inline_size_to_children(inline_start_content_edge,
self.propagate_assigned_inline_size_to_children(layout_context,
inline_start_content_edge,
content_inline_size,
None);
}