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layout: Take relative position offsets for inlines and inline-blocks

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into account only once.

There were two bugs here: (1) relative position applied to
scanned/unscanned text fragments independently of the container element
that applied that relative position, causing double-counting; (2)
relative position applied to inline block fragments independently of the
wrapped block itself, causing double-counting.

This commit also removes the `cascade_anonymous` function and the
related `Fragment` constructor. They were unused, and their
functionality has been replaced by the `modify_style_for_*` series of
functions.

Closes #7067.
This commit is contained in:
Patrick Walton 2015-08-10 18:05:29 -07:00
parent 3ad49fc689
commit 8640cf5588
11 changed files with 102 additions and 88 deletions
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66
components/style/properties.mako.rs
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@ -6385,43 +6385,6 @@ pub fn cascade(viewport_size: Size2D<Au>,
}, cacheable)
}
/// Equivalent to `cascade()` with an empty `applicable_declarations`
/// Performs the CSS cascade for an anonymous box.
///
/// * `parent_style`: Computed style of the element this anonymous box inherits from.
pub fn cascade_anonymous(parent_style: &ComputedValues) -> ComputedValues {
let initial_values = &*INITIAL_VALUES;
let mut result = ComputedValues {
% for style_struct in STYLE_STRUCTS:
${style_struct.ident}:
% if style_struct.inherited:
parent_style
% else:
initial_values
% endif
.${style_struct.ident}.clone(),
% endfor
shareable: false,
writing_mode: parent_style.writing_mode,
root_font_size: parent_style.root_font_size,
};
{
let border = Arc::make_unique(&mut result.border);
% for side in ["top", "right", "bottom", "left"]:
// Like calling to_computed_value, which wouldn't type check.
border.border_${side}_width = Au(0);
% endfor
}
{
// Initial value of outline-style is always none for anonymous box.
let outline = Arc::make_unique(&mut result.outline);
outline.outline_width = Au(0);
}
// None of the teaks on 'display' apply here.
result
}
/// Alters the given style to accommodate replaced content. This is called in flow construction. It
/// handles cases like `<div style="position: absolute">foo bar baz</div>` (in which `foo`, `bar`,
/// and `baz` must not be absolutely-positioned) and cases like `<sup>Foo</sup>` (in which the
@ -6434,7 +6397,8 @@ pub fn modify_style_for_replaced_content(style: &mut Arc<ComputedValues>) {
if style.box_.display != longhands::display::computed_value::T::inline {
let mut style = Arc::make_unique(style);
Arc::make_unique(&mut style.box_).display = longhands::display::computed_value::T::inline;
Arc::make_unique(&mut style.box_).position = longhands::position::computed_value::T::static_;
Arc::make_unique(&mut style.box_).position =
longhands::position::computed_value::T::static_;
}
// Reset `vertical-align` to handle cases like `<sup>foo</sup>`.
@ -6528,6 +6492,32 @@ pub fn modify_style_for_anonymous_table_object(
box_style.position = longhands::position::computed_value::T::static_;
}
/// Adjusts the `position` property as necessary for the outer fragment wrapper of an inline-block.
#[inline]
pub fn modify_style_for_outer_inline_block_fragment(style: &mut Arc<ComputedValues>) {
let mut style = Arc::make_unique(style);
let box_style = Arc::make_unique(&mut style.box_);
box_style.position = longhands::position::computed_value::T::static_
}
/// Adjusts the `position` property as necessary to account for text.
///
/// Text is never directly relatively positioned; it's always contained within an element that is
/// itself relatively positioned.
#[inline]
pub fn modify_style_for_text(style: &mut Arc<ComputedValues>) {
if style.box_.position == longhands::position::computed_value::T::relative {
// We leave the `position` property set to `relative` so that we'll still establish a
// containing block if needed. But we reset all position offsets to `auto`.
let mut style = Arc::make_unique(style);
let mut position_offsets = Arc::make_unique(&mut style.positionoffsets);
position_offsets.top = computed::LengthOrPercentageOrAuto::Auto;
position_offsets.right = computed::LengthOrPercentageOrAuto::Auto;
position_offsets.bottom = computed::LengthOrPercentageOrAuto::Auto;
position_offsets.left = computed::LengthOrPercentageOrAuto::Auto;
}
}
pub fn is_supported_property(property: &str) -> bool {
match_ignore_ascii_case! { property,
% for property in SHORTHANDS + LONGHANDS[:-1]: