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layout: Implement most of border-collapse per CSS 2.1 § 17.6.2.

Browse source 
Known issues:

* Collapsed borders do not correctly affect the border-box of the table
  itself.

* The content widths of all cells in a column and the content height of
  all cells in a row is the same in this patch, but not in Gecko and
  WebKit.

* Corners are not painted well. The spec does not say what to do here.

* Column spans are not handled well. The spec does not say what to do
  here either.
This commit is contained in:
Patrick Walton 2015-03-09 12:33:04 -07:00 • committed by Simon Sapin
parent 92359c7b9a
commit 48299a53cb
22 changed files with 1975 additions and 520 deletions
Download patch file Download diff file Expand all files Collapse all files

621
components/layout/table.rs
View file

@ -9,6 +9,7 @@
use block::{self, BlockFlow, CandidateBSizeIterator, ISizeAndMarginsComputer};
use block::{ISizeConstraintInput, ISizeConstraintSolution};
use context::LayoutContext;
use display_list_builder::{BlockFlowDisplayListBuilding, BorderPaintingMode};
use floats::FloatKind;
use flow::{self, Flow, FlowClass, IMPACTED_BY_LEFT_FLOATS, IMPACTED_BY_RIGHT_FLOATS};
use flow::{ImmutableFlowUtils};
@ -16,20 +17,23 @@ use fragment::{Fragment, FragmentBorderBoxIterator};
use incremental::{REFLOW, REFLOW_OUT_OF_FLOW};
use layout_debug;
use model::{IntrinsicISizes, IntrinsicISizesContribution, MaybeAuto};
use table_row::CellIntrinsicInlineSize;
use table_row::{self, CellIntrinsicInlineSize, CollapsedBorder, CollapsedBorderProvenance};
use table_row::{TableRowFlow};
use table_wrapper::TableLayout;
use wrapper::ThreadSafeLayoutNode;
use geom::{Point2D, Rect};
use std::cmp::max;
use gfx::display_list::DisplayList;
use std::cmp;
use std::fmt;
use std::iter;
use std::sync::Arc;
use style::computed_values::{border_collapse, border_spacing, table_layout};
use style::properties::ComputedValues;
use style::values::CSSFloat;
use style::values::computed::LengthOrPercentageOrAuto;
use util::geometry::Au;
use util::logical_geometry::{LogicalRect, WritingMode};
use util::logical_geometry::LogicalRect;
/// A table flow corresponded to the table's internal table fragment under a table wrapper flow.
/// The properties `position`, `float`, and `margin-*` are used on the table wrapper fragment,
@ -42,10 +46,18 @@ pub struct TableFlow {
/// intrinsic inline-size bubbling.
pub column_intrinsic_inline_sizes: Vec<ColumnIntrinsicInlineSize>,
/// Information about the actual inline-sizes of each column, computed top-down during actual
/// Information about the actual inline sizes of each column, computed top-down during actual
/// inline-size bubbling.
pub column_computed_inline_sizes: Vec<ColumnComputedInlineSize>,
/// The final width of the borders in the inline direction for each cell, computed by the
/// entire table and pushed down into each row during inline size computation.
pub collapsed_inline_direction_border_widths_for_table: Vec<Au>,
/// The final width of the borders in the block direction for each cell, computed by the
/// entire table and pushed down into each row during inline size computation.
pub collapsed_block_direction_border_widths_for_table: Vec<Au>,
/// Table-layout property
pub table_layout: TableLayout,
}
@ -65,6 +77,8 @@ impl TableFlow {
block_flow: block_flow,
column_intrinsic_inline_sizes: Vec::new(),
column_computed_inline_sizes: Vec::new(),
collapsed_inline_direction_border_widths_for_table: Vec::new(),
collapsed_block_direction_border_widths_for_table: Vec::new(),
table_layout: table_layout
}
}
@ -84,6 +98,8 @@ impl TableFlow {
block_flow: block_flow,
column_intrinsic_inline_sizes: Vec::new(),
column_computed_inline_sizes: Vec::new(),
collapsed_inline_direction_border_widths_for_table: Vec::new(),
collapsed_block_direction_border_widths_for_table: Vec::new(),
table_layout: table_layout
}
}
@ -109,10 +125,10 @@ impl TableFlow {
} else {
let column_size = &child_cell_inline_size.column_size;
*parent_sizes = ColumnIntrinsicInlineSize {
minimum_length: max(parent_sizes.minimum_length,
column_size.minimum_length),
minimum_length: cmp::max(parent_sizes.minimum_length,
column_size.minimum_length),
percentage: parent_sizes.greatest_percentage(column_size),
preferred: max(parent_sizes.preferred, column_size.preferred),
preferred: cmp::max(parent_sizes.preferred, column_size.preferred),
constrained: parent_sizes.constrained || column_size.constrained,
}
}
@ -146,7 +162,7 @@ impl TableFlow {
fn update_column_inline_sizes_for_row(child: &mut Flow,
column_inline_sizes: &mut Vec<ColumnIntrinsicInlineSize>,
computation: &mut IntrinsicISizesContribution,
did_first_row: &mut bool,
first_row: bool,
table_layout: TableLayout) {
// Read column inline-sizes from the table-row, and assign inline-size=0 for the columns
// not defined in the column group.
@ -159,8 +175,7 @@ impl TableFlow {
// Fixed table layout only looks at the first row.
//
// FIXME(pcwalton): This is really inefficient. We should stop after the first row!
if !*did_first_row {
*did_first_row = true;
if first_row {
for cell_inline_size in row.cell_intrinsic_inline_sizes.iter() {
column_inline_sizes.push(cell_inline_size.column_size);
}
@ -175,7 +190,7 @@ impl TableFlow {
}
/// Returns the effective spacing per cell, taking the value of `border-collapse` into account.
fn spacing(&self) -> border_spacing::T {
pub fn spacing(&self) -> border_spacing::T {
let style = self.block_flow.fragment.style();
match style.get_inheritedtable().border_collapse {
border_collapse::T::separate => style.get_inheritedtable().border_spacing,
@ -206,6 +221,10 @@ impl Flow for TableFlow {
&mut self.block_flow
}
fn as_immutable_block(&self) -> &BlockFlow {
&self.block_flow
}
fn column_intrinsic_inline_sizes<'a>(&'a mut self) -> &'a mut Vec<ColumnIntrinsicInlineSize> {
&mut self.column_intrinsic_inline_sizes
}
@ -224,50 +243,165 @@ impl Flow for TableFlow {
// Don't use `compute_intrinsic_inline_sizes` here because that will count padding as
// part of the table, which we don't want to do—it belongs to the table wrapper instead.
self.collapsed_inline_direction_border_widths_for_table = Vec::new();
self.collapsed_block_direction_border_widths_for_table = vec![Au(0)];
let collapsing_borders = self.block_flow
.fragment
.style
.get_inheritedtable()
.border_collapse == border_collapse::T::collapse;
let table_inline_collapsed_borders = if collapsing_borders {
Some(TableInlineCollapsedBorders {
start: CollapsedBorder::inline_start(&*self.block_flow.fragment.style,
CollapsedBorderProvenance::FromTable),
end: CollapsedBorder::inline_end(&*self.block_flow.fragment.style,
CollapsedBorderProvenance::FromTable),
})
} else {
None
};
let mut computation = IntrinsicISizesContribution::new();
let mut did_first_row = false;
for kid in self.block_flow.base.child_iter() {
debug_assert!(kid.is_proper_table_child());
if kid.is_table_colgroup() {
for specified_inline_size in kid.as_table_colgroup().inline_sizes.iter() {
self.column_intrinsic_inline_sizes.push(ColumnIntrinsicInlineSize {
minimum_length: match *specified_inline_size {
LengthOrPercentageOrAuto::Auto | LengthOrPercentageOrAuto::Percentage(_) => Au(0),
LengthOrPercentageOrAuto::Length(length) => length,
},
percentage: match *specified_inline_size {
LengthOrPercentageOrAuto::Auto | LengthOrPercentageOrAuto::Length(_) => 0.0,
LengthOrPercentageOrAuto::Percentage(percentage) => percentage,
},
preferred: Au(0),
constrained: false,
})
}
} else if kid.is_table_rowgroup() {
for grandkid in flow::mut_base(kid).child_iter() {
let mut previous_collapsed_block_end_borders = if collapsing_borders {
PreviousBlockCollapsedBorders::FromTable(CollapsedBorder::block_start(
&*self.block_flow.fragment.style,
CollapsedBorderProvenance::FromTable))
} else {
PreviousBlockCollapsedBorders::NotCollapsingBorders
};
let mut first_row = true;
{
let mut iterator = self.block_flow.base.child_iter().peekable();
while let Some(kid) = iterator.next() {
let next_index_and_sibling = iterator.peek();
let next_collapsed_borders_in_block_direction = if collapsing_borders {
match next_index_and_sibling {
Some(next_sibling) => {
if next_sibling.is_table_rowgroup() {
NextBlockCollapsedBorders::FromNextRow(
&next_sibling.as_immutable_table_rowgroup()
.preliminary_collapsed_borders
.block_start
.as_slice())
} else {
NextBlockCollapsedBorders::FromNextRow(
&next_sibling.as_immutable_table_row()
.preliminary_collapsed_borders
.block_start
.as_slice())
}
}
None => {
NextBlockCollapsedBorders::FromTable(
CollapsedBorder::block_end(&*self.block_flow.fragment.style,
CollapsedBorderProvenance::FromTable))
}
}
} else {
NextBlockCollapsedBorders::NotCollapsingBorders
};
if kid.is_table_colgroup() {
for specified_inline_size in kid.as_table_colgroup().inline_sizes.iter() {
self.column_intrinsic_inline_sizes.push(ColumnIntrinsicInlineSize {
minimum_length: match *specified_inline_size {
LengthOrPercentageOrAuto::Auto |
LengthOrPercentageOrAuto::Percentage(_) => Au(0),
LengthOrPercentageOrAuto::Length(length) => length,
},
percentage: match *specified_inline_size {
LengthOrPercentageOrAuto::Auto |
LengthOrPercentageOrAuto::Length(_) => 0.0,
LengthOrPercentageOrAuto::Percentage(percentage) => percentage,
},
preferred: Au(0),
constrained: false,
})
}
} else if kid.is_table_row() {
TableFlow::update_column_inline_sizes_for_row(
grandkid,
&mut self.column_intrinsic_inline_sizes,
&mut computation,
&mut did_first_row,
self.table_layout)
kid,
&mut self.column_intrinsic_inline_sizes,
&mut computation,
first_row,
self.table_layout);
if collapsing_borders {
perform_border_collapse_for_row(
kid.as_table_row(),
table_inline_collapsed_borders.as_ref().unwrap(),
previous_collapsed_block_end_borders,
next_collapsed_borders_in_block_direction,
&mut self.collapsed_inline_direction_border_widths_for_table,
&mut self.collapsed_block_direction_border_widths_for_table);
previous_collapsed_block_end_borders =
PreviousBlockCollapsedBorders::FromPreviousRow(
kid.as_table_row().final_collapsed_borders.block_end.clone())
}
first_row = false
} else if kid.is_table_rowgroup() {
let mut iterator = flow::mut_base(kid).child_iter().peekable();
while let Some(grandkid) = iterator.next() {
let grandkid_next_sibling = iterator.peek();
let next_collapsed_borders_in_block_direction = if collapsing_borders {
match grandkid_next_sibling {
Some(grandkid_next_sibling) => {
if grandkid_next_sibling.is_table_rowgroup() {
NextBlockCollapsedBorders::FromNextRow(
&grandkid_next_sibling.as_immutable_table_rowgroup()
.preliminary_collapsed_borders
.block_start
.as_slice())
} else {
NextBlockCollapsedBorders::FromNextRow(
&grandkid_next_sibling.as_immutable_table_row()
.preliminary_collapsed_borders
.block_start
.as_slice())
}
}
None => {
NextBlockCollapsedBorders::FromTable(
CollapsedBorder::block_end(
&*self.block_flow.fragment.style,
CollapsedBorderProvenance::FromTable))
}
}
} else {
NextBlockCollapsedBorders::NotCollapsingBorders
};
TableFlow::update_column_inline_sizes_for_row(
grandkid,
&mut self.column_intrinsic_inline_sizes,
&mut computation,
first_row,
self.table_layout);
if collapsing_borders {
perform_border_collapse_for_row(
grandkid.as_table_row(),
table_inline_collapsed_borders.as_ref().unwrap(),
previous_collapsed_block_end_borders,
next_collapsed_borders_in_block_direction,
&mut self.collapsed_inline_direction_border_widths_for_table,
&mut self.collapsed_block_direction_border_widths_for_table);
previous_collapsed_block_end_borders =
PreviousBlockCollapsedBorders::FromPreviousRow(
grandkid.as_table_row()
.final_collapsed_borders
.block_end
.clone())
}
first_row = false
}
}
} else if kid.is_table_row() {
TableFlow::update_column_inline_sizes_for_row(
kid,
&mut self.column_intrinsic_inline_sizes,
&mut computation,
&mut did_first_row,
self.table_layout)
}
}
let spacing = self.block_flow
.fragment
.style()
.get_inheritedtable()
.border_spacing
.horizontal * (self.column_intrinsic_inline_sizes.len() as i32 + 1);
let spacing = self.spacing().horizontal *
(self.column_intrinsic_inline_sizes.len() as i32 + 1);
computation.surrounding_size = computation.surrounding_size + spacing;
self.block_flow.base.intrinsic_inline_sizes = computation.finish()
@ -295,9 +429,11 @@ impl Flow for TableFlow {
}
let inline_size_computer = InternalTable;
let border_collapse = self.block_flow.fragment.style.get_inheritedtable().border_collapse;
inline_size_computer.compute_used_inline_size(&mut self.block_flow,
layout_context,
containing_block_inline_size);
containing_block_inline_size,
border_collapse);
let inline_start_content_edge = self.block_flow.fragment.border_padding.inline_start;
let inline_end_content_edge = self.block_flow.fragment.border_padding.inline_end;
@ -347,15 +483,41 @@ impl Flow for TableFlow {
self.block_flow.base.flags.remove(IMPACTED_BY_LEFT_FLOATS);
self.block_flow.base.flags.remove(IMPACTED_BY_RIGHT_FLOATS);
let info = ChildInlineSizeInfo {
column_computed_inline_sizes: &self.column_computed_inline_sizes,
spacing: spacing_per_cell,
};
let column_computed_inline_sizes = self.column_computed_inline_sizes.as_slice();
let collapsed_inline_direction_border_widths_for_table =
self.collapsed_inline_direction_border_widths_for_table.as_slice();
let mut collapsed_block_direction_border_widths_for_table =
self.collapsed_block_direction_border_widths_for_table.iter().peekable();
self.block_flow.propagate_assigned_inline_size_to_children(layout_context,
inline_start_content_edge,
inline_end_content_edge,
content_inline_size,
Some(info));
|child_flow,
child_index,
content_inline_size,
writing_mode,
inline_start_margin_edge| {
table_row::propagate_column_inline_sizes_to_child(
child_flow,
child_index,
content_inline_size,
writing_mode,
column_computed_inline_sizes,
&spacing_per_cell,
&None,
inline_start_margin_edge);
if child_flow.is_table_row() {
let child_table_row = child_flow.as_table_row();
child_table_row.populate_collapsed_border_spacing(
collapsed_inline_direction_border_widths_for_table.as_slice(),
&mut collapsed_block_direction_border_widths_for_table);
} else if child_flow.is_table_rowgroup() {
let child_table_rowgroup = child_flow.as_table_rowgroup();
child_table_rowgroup.populate_collapsed_border_spacing(
collapsed_inline_direction_border_widths_for_table.as_slice(),
&mut collapsed_block_direction_border_widths_for_table);
}
})
}
fn assign_block_size<'a>(&mut self, layout_context: &'a LayoutContext<'a>) {
@ -381,7 +543,18 @@ impl Flow for TableFlow {
}
fn build_display_list(&mut self, layout_context: &LayoutContext) {
self.block_flow.build_display_list(layout_context);
let border_painting_mode = match self.block_flow
.fragment
.style
.get_inheritedtable()
.border_collapse {
border_collapse::T::separate => BorderPaintingMode::Separate,
border_collapse::T::collapse => BorderPaintingMode::Hidden,
};
self.block_flow.build_display_list_for_block(box DisplayList::new(),
layout_context,
border_painting_mode);
}
fn repair_style(&mut self, new_style: &Arc<ComputedValues>) {
@ -420,11 +593,13 @@ impl ISizeAndMarginsComputer for InternalTable {
/// CSS Section 10.4: Minimum and Maximum inline-sizes
fn compute_used_inline_size(&self,
block: &mut BlockFlow,
ctx: &LayoutContext,
parent_flow_inline_size: Au) {
layout_context: &LayoutContext,
parent_flow_inline_size: Au,
border_collapse: border_collapse::T) {
let input = self.compute_inline_size_constraint_inputs(block,
parent_flow_inline_size,
ctx);
layout_context,
border_collapse);
let solution = self.solve_inline_size_constraints(block, &input);
self.set_inline_size_constraint_solutions(block, solution);
@ -437,87 +612,6 @@ impl ISizeAndMarginsComputer for InternalTable {
}
}
/// Encapsulates functionality shared among all table-like flows: for now, tables and table
/// rowgroups.
pub trait TableLikeFlow {
/// Lays out the rows of a table.
fn assign_block_size_for_table_like_flow<'a>(&mut self,
layout_context: &'a LayoutContext<'a>,
block_direction_spacing: Au);
}
impl TableLikeFlow for BlockFlow {
fn assign_block_size_for_table_like_flow<'a>(&mut self,
_: &'a LayoutContext<'a>,
block_direction_spacing: Au) {
if self.base.restyle_damage.contains(REFLOW) {
// Our current border-box position.
let block_start_border_padding = self.fragment.border_padding.block_start;
let mut current_block_offset = block_start_border_padding;
// At this point, `current_block_offset` is at the content edge of our box. Now iterate
// over children.
let mut layers_needed_for_descendants = false;
for kid in self.base.child_iter() {
// Mark flows for layerization if necessary to handle painting order correctly.
block::propagate_layer_flag_from_child(&mut layers_needed_for_descendants, kid);
// Account for spacing.
if kid.is_table_row() {
current_block_offset = current_block_offset + block_direction_spacing;
}
// At this point, `current_block_offset` is at the border edge of the child.
flow::mut_base(kid).position.start.b = current_block_offset;
// Move past the child's border box. Do not use the `translate_including_floats`
// function here because the child has already translated floats past its border
// box.
let kid_base = flow::mut_base(kid);
current_block_offset = current_block_offset + kid_base.position.size.block;
}
// Compute any explicitly-specified block size.
// Can't use `for` because we assign to `candidate_block_size_iterator.candidate_value`.
let mut block_size = current_block_offset - block_start_border_padding;
let mut candidate_block_size_iterator = CandidateBSizeIterator::new(
&self.fragment,
self.base.block_container_explicit_block_size);
loop {
match candidate_block_size_iterator.next() {
Some(candidate_block_size) => {
candidate_block_size_iterator.candidate_value =
match candidate_block_size {
MaybeAuto::Auto => block_size,
MaybeAuto::Specified(value) => value
}
}
None => break,
}
}
// Adjust `current_block_offset` as necessary to account for the explicitly-specified
// block-size.
block_size = candidate_block_size_iterator.candidate_value;
let delta = block_size - (current_block_offset - block_start_border_padding);
current_block_offset = current_block_offset + delta;
// Take border, padding, and spacing into account.
let block_end_offset = self.fragment.border_padding.block_end +
block_direction_spacing;
current_block_offset = current_block_offset + block_end_offset;
// Now that `current_block_offset` is at the block-end of the border box, compute the
// final border box position.
self.fragment.border_box.size.block = current_block_offset;
self.fragment.border_box.start.b = Au(0);
self.base.position.size.block = current_block_offset;
}
self.base.restyle_damage.remove(REFLOW_OUT_OF_FLOW | REFLOW);
}
}
/// Information about the intrinsic inline sizes of columns within a table.
///
/// During table inline-size bubbling, we might need to store both a percentage constraint and a
@ -556,7 +650,7 @@ impl ColumnIntrinsicInlineSize {
/// Beware that this is generally only correct for fixed table layout. (Compare CSS 2.1 §
/// 17.5.2.1 with the algorithm in INTRINSIC § 4.)
pub fn minimum(&self, containing_block_inline_size: Au) -> Au {
max(self.minimum_length, containing_block_inline_size.scale_by(self.percentage))
cmp::max(self.minimum_length, containing_block_inline_size.scale_by(self.percentage))
}
/// Returns the higher of the two percentages specified in `self` and `other`.
@ -579,63 +673,206 @@ pub struct ColumnComputedInlineSize {
pub size: Au,
}
/// Inline-size information that we need to push down to table children.
pub struct ChildInlineSizeInfo<'a> {
/// The spacing of the table.
pub spacing: border_spacing::T,
/// The computed inline sizes for each column.
pub column_computed_inline_sizes: &'a [ColumnComputedInlineSize],
pub trait VecExt<T> {
fn push_or_set(&mut self, index: usize, value: T);
fn push_or_mutate(&mut self, index: usize, zero: T) -> &mut T;
}
impl<'a> ChildInlineSizeInfo<'a> {
/// Propagates information computed during inline size assignment to a child of a table, and
/// lays out that child in the inline direction.
pub fn propagate_to_child(&self,
kid: &mut Flow,
child_index: usize,
content_inline_size: Au,
writing_mode: WritingMode,
inline_start_margin_edge: &mut Au) {
// If the child is a table or a row, copy computed inline size information from its parent.
//
// FIXME(pcwalton): This seems inefficient. Reference count it instead?
let inline_size;
if kid.is_table() {
let table_kid = kid.as_table();
table_kid.column_computed_inline_sizes = self.column_computed_inline_sizes.to_vec();
inline_size = content_inline_size
} else if kid.is_table_rowgroup() {
let table_rowgroup_kid = kid.as_table_rowgroup();
table_rowgroup_kid.column_computed_inline_sizes =
self.column_computed_inline_sizes.to_vec();
table_rowgroup_kid.spacing = self.spacing;
inline_size = content_inline_size
} else if kid.is_table_row() {
let table_row_kid = kid.as_table_row();
table_row_kid.column_computed_inline_sizes =
self.column_computed_inline_sizes.to_vec();
table_row_kid.spacing = self.spacing;
inline_size = content_inline_size
} else if kid.is_table_cell() {
// Take spacing into account.
*inline_start_margin_edge = *inline_start_margin_edge + self.spacing.horizontal;
inline_size = self.column_computed_inline_sizes[child_index].size;
impl<T> VecExt<T> for Vec<T> {
fn push_or_set(&mut self, index: usize, value: T) {
if index < self.len() {
self[index] = value
} else {
// ISize of kid flow is our content inline-size.
inline_size = content_inline_size
debug_assert!(index == self.len());
self.push(value)
}
}
{
let kid_base = flow::mut_base(kid);
kid_base.position.start.i = *inline_start_margin_edge;
kid_base.block_container_inline_size = inline_size;
kid_base.block_container_writing_mode = writing_mode
}
// Move over for the next table cell.
if kid.is_table_cell() {
*inline_start_margin_edge = *inline_start_margin_edge + inline_size
fn push_or_mutate(&mut self, index: usize, zero: T) -> &mut T {
if index >= self.len() {
debug_assert!(index == self.len());
self.push(zero)
}
&mut self[index]
}
}
/// Updates the border styles in the block direction for a single row. This function should
/// only be called if border collapsing is on. It is factored out into a separate function
/// because we process children of rowgroups too.
fn perform_border_collapse_for_row(child_table_row: &mut TableRowFlow,
table_inline_borders: &TableInlineCollapsedBorders,
previous_block_borders: PreviousBlockCollapsedBorders,
next_block_borders: NextBlockCollapsedBorders,
inline_spacing: &mut Vec<Au>,
block_spacing: &mut Vec<Au>) {
// Compute interior inline borders.
for (i, this_inline_border) in child_table_row.preliminary_collapsed_borders
.inline
.iter()
.enumerate() {
child_table_row.final_collapsed_borders.inline.push_or_set(i, *this_inline_border);
let inline_spacing = inline_spacing.push_or_mutate(i, Au(0));
*inline_spacing = cmp::max(*inline_spacing, this_inline_border.width)
}
// Collapse edge interior borders with the table.
if let Some(ref mut first_inline_borders) = child_table_row.final_collapsed_borders
.inline
.get_mut(0) {
first_inline_borders.combine(&table_inline_borders.start)
}
if let Some(ref mut last_inline_borders) = child_table_row.final_collapsed_borders
.inline
.last_mut() {
last_inline_borders.combine(&table_inline_borders.end)
}
// Compute block-start borders.
match previous_block_borders {
PreviousBlockCollapsedBorders::FromPreviousRow(previous_block_borders) => {
child_table_row.final_collapsed_borders.block_start = previous_block_borders
}
PreviousBlockCollapsedBorders::FromTable(collapsed_border) => {
child_table_row.final_collapsed_borders.block_start =
iter::repeat(collapsed_border).take(child_table_row.block_flow.base.children.len())
.collect()
}
PreviousBlockCollapsedBorders::NotCollapsingBorders => {}
}
// Compute block-end borders.
let next_block = &mut child_table_row.final_collapsed_borders.block_end;
block_spacing.push(Au(0));
let block_spacing = block_spacing.last_mut().unwrap();
for (i, this_block_border) in child_table_row.preliminary_collapsed_borders
.block_end
.iter()
.enumerate() {
let next_block = next_block.push_or_mutate(i, *this_block_border);
match next_block_borders {
NextBlockCollapsedBorders::FromNextRow(next_block_borders) => {
next_block.combine(&next_block_borders[i]);
}
NextBlockCollapsedBorders::FromTable(ref next_block_borders) => {
next_block.combine(next_block_borders);
}
NextBlockCollapsedBorders::NotCollapsingBorders => {}
}
*block_spacing = cmp::max(*block_spacing, next_block.width)
}
}
/// Encapsulates functionality shared among all table-like flows: for now, tables and table
/// rowgroups.
pub trait TableLikeFlow {
/// Lays out the rows of a table.
fn assign_block_size_for_table_like_flow<'a>(&mut self,
layout_context: &'a LayoutContext<'a>,
block_direction_spacing: Au);
}
impl TableLikeFlow for BlockFlow {
fn assign_block_size_for_table_like_flow<'a>(&mut self,
_: &'a LayoutContext<'a>,
block_direction_spacing: Au) {
debug_assert!(self.fragment.style.get_inheritedtable().border_collapse ==
border_collapse::T::separate || block_direction_spacing == Au(0));
if self.base.restyle_damage.contains(REFLOW) {
// Our current border-box position.
let block_start_border_padding = self.fragment.border_padding.block_start;
let mut current_block_offset = block_start_border_padding;
// At this point, `current_block_offset` is at the content edge of our box. Now iterate
// over children.
let mut layers_needed_for_descendants = false;
for kid in self.base.child_iter() {
// Mark flows for layerization if necessary to handle painting order correctly.
block::propagate_layer_flag_from_child(&mut layers_needed_for_descendants, kid);
// Account for spacing or collapsed borders.
if kid.is_table_row() {
let child_table_row = kid.as_table_row();
current_block_offset = current_block_offset +
match self.fragment.style.get_inheritedtable().border_collapse {
border_collapse::T::separate => block_direction_spacing,
border_collapse::T::collapse => {
child_table_row.collapsed_border_spacing.block_start
}
}
}
// At this point, `current_block_offset` is at the border edge of the child.
flow::mut_base(kid).position.start.b = current_block_offset;
// Move past the child's border box. Do not use the `translate_including_floats`
// function here because the child has already translated floats past its border
// box.
let kid_base = flow::mut_base(kid);
current_block_offset = current_block_offset + kid_base.position.size.block;
}
// Compute any explicitly-specified block size.
// Can't use `for` because we assign to
// `candidate_block_size_iterator.candidate_value`.
let mut block_size = current_block_offset - block_start_border_padding;
let mut candidate_block_size_iterator = CandidateBSizeIterator::new(
&self.fragment,
self.base.block_container_explicit_block_size);
loop {
match candidate_block_size_iterator.next() {
Some(candidate_block_size) => {
candidate_block_size_iterator.candidate_value =
match candidate_block_size {
MaybeAuto::Auto => block_size,
MaybeAuto::Specified(value) => value
}
}
None => break,
}
}
// Adjust `current_block_offset` as necessary to account for the explicitly-specified
// block-size.
block_size = candidate_block_size_iterator.candidate_value;
let delta = block_size - (current_block_offset - block_start_border_padding);
current_block_offset = current_block_offset + delta;
// Take border, padding, and spacing into account.
let block_end_offset = self.fragment.border_padding.block_end +
block_direction_spacing;
current_block_offset = current_block_offset + block_end_offset;
// Now that `current_block_offset` is at the block-end of the border box, compute the
// final border box position.
self.fragment.border_box.size.block = current_block_offset;
self.fragment.border_box.start.b = Au(0);
self.base.position.size.block = current_block_offset;
}
self.base.restyle_damage.remove(REFLOW_OUT_OF_FLOW | REFLOW);
}
}
/// Inline collapsed borders for the table itself.
struct TableInlineCollapsedBorders {
/// The table border at the start of the inline direction.
start: CollapsedBorder,
/// The table border at the end of the inline direction.
end: CollapsedBorder,
}
enum PreviousBlockCollapsedBorders {
FromPreviousRow(Vec<CollapsedBorder>),
FromTable(CollapsedBorder),
NotCollapsingBorders,
}
enum NextBlockCollapsedBorders<'a> {
FromNextRow(&'a [CollapsedBorder]),
FromTable(CollapsedBorder),
NotCollapsingBorders,
}