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gecko-dev/servo/components/layout/table.rs

1249 строки
54 KiB
Rust
Исходник Ответственный История

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! CSS table formatting contexts.
#![deny(unsafe_code)]
use app_units::Au;
use block::{BlockFlow, CandidateBSizeIterator, ISizeAndMarginsComputer};
use block::{ISizeConstraintInput, ISizeConstraintSolution};
use context::LayoutContext;
use display_list::{BlockFlowDisplayListBuilding, BorderPaintingMode};
use display_list::{DisplayListBuildState, StackingContextCollectionFlags, StackingContextCollectionState};
use euclid::Point2D;
use flow::{BaseFlow, EarlyAbsolutePositionInfo, Flow, FlowClass, ImmutableFlowUtils, GetBaseFlow, OpaqueFlow};
use flow_list::{FlowListIterator, MutFlowListIterator};
use fragment::{Fragment, FragmentBorderBoxIterator, Overflow};
use gfx_traits::print_tree::PrintTree;
use layout_debug;
use model::{IntrinsicISizes, IntrinsicISizesContribution, MaybeAuto};
use std::{cmp, fmt};
use style::computed_values::{border_collapse, border_spacing, table_layout};
use style::context::SharedStyleContext;
use style::logical_geometry::LogicalSize;
use style::properties::ComputedValues;
use style::properties::style_structs::Background;
use style::servo::restyle_damage::ServoRestyleDamage;
use style::values::CSSFloat;
use style::values::computed::LengthOrPercentageOrAuto;
use table_cell::TableCellFlow;
use table_row::{self, CellIntrinsicInlineSize, CollapsedBorder, CollapsedBorderProvenance};
use table_row::{TableRowFlow, TableRowSizeData};
use table_wrapper::TableLayout;
#[allow(unsafe_code)]
unsafe impl ::flow::HasBaseFlow for TableFlow {}
/// 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,
/// not table fragment per CSS 2.1 § 10.5.
#[derive(Serialize)]
#[repr(C)]
pub struct TableFlow {
pub block_flow: BlockFlow,
/// Information about the intrinsic inline-sizes of each column, computed bottom-up during
/// 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
/// 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,
}
impl TableFlow {
pub fn from_fragment(fragment: Fragment) -> TableFlow {
let mut block_flow = BlockFlow::from_fragment(fragment);
let table_layout =
if block_flow.fragment().style().get_table().table_layout == table_layout::T::Fixed {
TableLayout::Fixed
} else {
TableLayout::Auto
};
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
}
}
/// Update the corresponding value of `self_inline_sizes` if a value of `kid_inline_sizes` has
/// a larger value than one of `self_inline_sizes`. Returns the minimum and preferred inline
/// sizes.
fn update_automatic_column_inline_sizes(
parent_inline_sizes: &mut Vec<ColumnIntrinsicInlineSize>,
child_cell_inline_sizes: &[CellIntrinsicInlineSize],
surrounding_size: Au)
-> IntrinsicISizes {
let mut total_inline_sizes = IntrinsicISizes {
minimum_inline_size: surrounding_size,
preferred_inline_size: surrounding_size,
};
let mut column_index = 0;
let mut incoming_rowspan = vec![];
for child_cell_inline_size in child_cell_inline_sizes {
// Skip any column occupied by a cell from a previous row.
while column_index < incoming_rowspan.len() && incoming_rowspan[column_index] != 1 {
if incoming_rowspan[column_index] > 1 {
incoming_rowspan[column_index] -= 1;
}
column_index += 1;
}
for _ in 0..child_cell_inline_size.column_span {
if column_index < parent_inline_sizes.len() {
// We already have some intrinsic size information for this column. Merge it in
// according to the rules specified in INTRINSIC § 4.
let parent_sizes = &mut parent_inline_sizes[column_index];
if child_cell_inline_size.column_span > 1 {
// TODO(pcwalton): Perform the recursive algorithm specified in INTRINSIC §
// 4. For now we make this column contribute no width.
} else {
let column_size = &child_cell_inline_size.column_size;
*parent_sizes = ColumnIntrinsicInlineSize {
minimum_length: cmp::max(parent_sizes.minimum_length,
column_size.minimum_length),
percentage: parent_sizes.greatest_percentage(column_size),
preferred: cmp::max(parent_sizes.preferred, column_size.preferred),
constrained: parent_sizes.constrained || column_size.constrained,
}
}
} else {
// We discovered a new column. Initialize its data.
debug_assert_eq!(column_index, parent_inline_sizes.len());
if child_cell_inline_size.column_span > 1 {
// TODO(pcwalton): Perform the recursive algorithm specified in INTRINSIC §
// 4. For now we make this column contribute no width.
parent_inline_sizes.push(ColumnIntrinsicInlineSize::new())
} else {
parent_inline_sizes.push(child_cell_inline_size.column_size)
}
}
total_inline_sizes.minimum_inline_size +=
parent_inline_sizes[column_index].minimum_length;
total_inline_sizes.preferred_inline_size +=
parent_inline_sizes[column_index].preferred;
// If this cell spans later rows, record its rowspan.
if child_cell_inline_size.row_span > 1 {
if incoming_rowspan.len() < column_index + 1 {
incoming_rowspan.resize(column_index + 1, 0);
}
incoming_rowspan[column_index] = child_cell_inline_size.row_span;
}
column_index += 1
}
}
total_inline_sizes
}
/// Updates the minimum and preferred inline-size calculation for a single row. This is
/// factored out into a separate function because we process children of rowgroups too.
fn update_column_inline_sizes_for_row(row: &TableRowFlow,
column_inline_sizes: &mut Vec<ColumnIntrinsicInlineSize>,
computation: &mut IntrinsicISizesContribution,
first_row: bool,
table_layout: TableLayout,
surrounding_inline_size: Au) {
// Read column inline-sizes from the table-row, and assign inline-size=0 for the columns
// not defined in the column group.
//
// FIXME: Need to read inline-sizes from either table-header-group OR the first table-row.
match table_layout {
TableLayout::Fixed => {
// Fixed table layout only looks at the first row.
//
// FIXME(pcwalton): This is really inefficient. We should stop after the first row!
if first_row {
for cell_inline_size in &row.cell_intrinsic_inline_sizes {
column_inline_sizes.push(cell_inline_size.column_size);
}
}
}
TableLayout::Auto => {
computation.union_block(&TableFlow::update_automatic_column_inline_sizes(
column_inline_sizes,
&row.cell_intrinsic_inline_sizes,
surrounding_inline_size))
}
}
}
/// Returns the effective spacing per cell, taking the value of `border-collapse` into account.
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,
border_collapse::T::Collapse => border_spacing::T::zero(),
}
}
pub fn total_horizontal_spacing(&self) -> Au {
let num_columns = self.column_intrinsic_inline_sizes.len();
if num_columns == 0 {
return Au(0);
}
self.spacing().horizontal() * (num_columns as i32 + 1)
}
fn column_styles(&self) -> Vec<ColumnStyle> {
let mut styles = vec![];
for group in self.block_flow.base.child_iter()
.filter(|kid| kid.is_table_colgroup()) {
// XXXManishearth these as_foo methods should return options
// so that we can filter_map
let group = group.as_table_colgroup();
let colgroup_style = group.fragment.as_ref()
.map(|f| f.style());
// The colgroup's span attribute is only relevant when
// it has no children
// https://html.spec.whatwg.org/multipage/#forming-a-table
if group.cols.is_empty() {
let span = group.fragment.as_ref()
.map(|f| f.column_span()).unwrap_or(1);
styles.push(ColumnStyle { span, colgroup_style, col_style: None });
} else {
for col in &group.cols {
// XXXManishearth Arc-cloning colgroup_style is suboptimal
styles.push(ColumnStyle {
span: col.column_span(),
colgroup_style: colgroup_style,
col_style: Some(col.style()),
})
}
}
}
styles
}
}
impl Flow for TableFlow {
fn class(&self) -> FlowClass {
FlowClass::Table
}
fn as_mut_table(&mut self) -> &mut TableFlow {
self
}
fn as_table(&self) -> &TableFlow {
self
}
fn as_mut_block(&mut self) -> &mut BlockFlow {
&mut self.block_flow
}
fn as_block(&self) -> &BlockFlow {
&self.block_flow
}
fn mark_as_root(&mut self) {
self.block_flow.mark_as_root();
}
/// The specified column inline-sizes are set from column group and the first row for the fixed
/// table layout calculation.
/// The maximum min/pref inline-sizes of each column are set from the rows for the automatic
/// table layout calculation.
fn bubble_inline_sizes(&mut self) {
let _scope = layout_debug_scope!("table::bubble_inline_sizes {:x}",
self.block_flow.base.debug_id());
// Get column inline sizes from colgroups
for kid in self.block_flow.base.child_iter_mut().filter(|kid| kid.is_table_colgroup()) {
for specified_inline_size in &kid.as_mut_table_colgroup().inline_sizes {
self.column_intrinsic_inline_sizes.push(ColumnIntrinsicInlineSize {
minimum_length: match *specified_inline_size {
LengthOrPercentageOrAuto::Auto |
LengthOrPercentageOrAuto::Calc(_) |
LengthOrPercentageOrAuto::Percentage(_) => Au(0),
LengthOrPercentageOrAuto::Length(length) => Au::from(length),
},
percentage: match *specified_inline_size {
LengthOrPercentageOrAuto::Auto |
LengthOrPercentageOrAuto::Calc(_) |
LengthOrPercentageOrAuto::Length(_) => 0.0,
LengthOrPercentageOrAuto::Percentage(percentage) => percentage.0,
},
preferred: Au(0),
constrained: false,
})
}
}
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 previous_collapsed_block_end_borders =
PreviousBlockCollapsedBorders::FromTable(CollapsedBorder::block_start(
&*self.block_flow.fragment.style,
CollapsedBorderProvenance::FromTable));
let mut first_row = true;
let (border_padding, _) = self.block_flow.fragment.surrounding_intrinsic_inline_size();
{
let mut iterator = TableRowIterator::new(&mut self.block_flow.base).peekable();
while let Some(row) = iterator.next() {
TableFlow::update_column_inline_sizes_for_row(
row,
&mut self.column_intrinsic_inline_sizes,
&mut computation,
first_row,
self.table_layout,
border_padding);
if collapsing_borders {
let next_index_and_sibling = iterator.peek();
let next_collapsed_borders_in_block_direction =
match next_index_and_sibling {
Some(next_sibling) => {
NextBlockCollapsedBorders::FromNextRow(
&next_sibling.as_table_row()
.preliminary_collapsed_borders
.block_start)
}
None => {
NextBlockCollapsedBorders::FromTable(
CollapsedBorder::block_end(&*self.block_flow.fragment.style,
CollapsedBorderProvenance::FromTable))
}
};
perform_border_collapse_for_row(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(
row.final_collapsed_borders.block_end.clone());
}
first_row = false
};
}
let total_horizontal_spacing = self.total_horizontal_spacing();
let mut style_specified_intrinsic_inline_size =
self.block_flow
.fragment
.style_specified_intrinsic_inline_size()
.finish();
style_specified_intrinsic_inline_size.minimum_inline_size -= total_horizontal_spacing;
style_specified_intrinsic_inline_size.preferred_inline_size -= total_horizontal_spacing;
computation.union_block(&style_specified_intrinsic_inline_size);
computation.surrounding_size += total_horizontal_spacing;
self.block_flow.base.intrinsic_inline_sizes = computation.finish()
}
/// Recursively (top-down) determines the actual inline-size of child contexts and fragments.
/// When called on this context, the context has had its inline-size set by the parent context.
fn assign_inline_sizes(&mut self, layout_context: &LayoutContext) {
let _scope = layout_debug_scope!("table::assign_inline_sizes {:x}",
self.block_flow.base.debug_id());
debug!("assign_inline_sizes({}): assigning inline_size for flow", "table");
let shared_context = layout_context.shared_context();
// The position was set to the containing block by the flow's parent.
// FIXME: The code for distributing column widths should really be placed under table_wrapper.rs.
let containing_block_inline_size = self.block_flow.base.block_container_inline_size;
let mut constrained_column_inline_sizes_indices = vec![];
let mut unspecified_inline_sizes_indices = vec![];
for (idx, column_inline_size) in self.column_intrinsic_inline_sizes.iter().enumerate() {
if column_inline_size.constrained {
constrained_column_inline_sizes_indices.push(idx);
} else if column_inline_size.percentage == 0.0 {
unspecified_inline_sizes_indices.push(idx);
}
}
let inline_size_computer = InternalTable;
inline_size_computer.compute_used_inline_size(&mut self.block_flow,
shared_context,
containing_block_inline_size);
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;
let padding_and_borders = self.block_flow.fragment.border_padding.inline_start_end();
let spacing_per_cell = self.spacing();
let total_horizontal_spacing = self.total_horizontal_spacing();
let content_inline_size = self.block_flow.fragment.border_box.size.inline -
padding_and_borders - total_horizontal_spacing;
let mut remaining_inline_size = content_inline_size;
match self.table_layout {
TableLayout::Fixed => {
self.column_computed_inline_sizes.clear();
// https://drafts.csswg.org/css2/tables.html#fixed-table-layout
for column_inline_size in &self.column_intrinsic_inline_sizes {
if column_inline_size.constrained {
self.column_computed_inline_sizes.push(ColumnComputedInlineSize {
size: column_inline_size.minimum_length,
});
remaining_inline_size -= column_inline_size.minimum_length;
} else if column_inline_size.percentage != 0.0 {
let size = remaining_inline_size.scale_by(column_inline_size.percentage);
self.column_computed_inline_sizes.push(ColumnComputedInlineSize {
size: size,
});
remaining_inline_size -= size;
} else {
// Set the size to 0 now, distribute the remaining widths later
self.column_computed_inline_sizes.push(ColumnComputedInlineSize {
size: Au(0),
});
}
}
// Distribute remaining content inline size
if unspecified_inline_sizes_indices.len() > 0 {
for &index in &unspecified_inline_sizes_indices {
self.column_computed_inline_sizes[index].size =
remaining_inline_size.scale_by(1.0 / unspecified_inline_sizes_indices.len() as f32);
}
} else {
let total_minimum_size = self.column_intrinsic_inline_sizes
.iter()
.filter(|size| size.constrained)
.map(|size| size.minimum_length.0 as f32)
.sum::<f32>();
for &index in &constrained_column_inline_sizes_indices {
self.column_computed_inline_sizes[index].size +=
remaining_inline_size.scale_by(
self.column_computed_inline_sizes[index].size.0 as f32 / total_minimum_size);
}
}
}
_ => {
// The table wrapper already computed the inline-sizes and propagated them down
// to us.
}
}
let column_computed_inline_sizes = &self.column_computed_inline_sizes;
let collapsed_inline_direction_border_widths_for_table =
&self.collapsed_inline_direction_border_widths_for_table;
let mut collapsed_block_direction_border_widths_for_table =
self.collapsed_block_direction_border_widths_for_table.iter().peekable();
let mut incoming_rowspan = vec![];
self.block_flow.propagate_assigned_inline_size_to_children(shared_context,
inline_start_content_edge,
inline_end_content_edge,
content_inline_size,
|child_flow,
_child_index,
_content_inline_size,
writing_mode,
_inline_start_margin_edge,
_inline_end_margin_edge| {
table_row::propagate_column_inline_sizes_to_child(
child_flow,
writing_mode,
column_computed_inline_sizes,
&spacing_per_cell,
&mut incoming_rowspan);
if child_flow.is_table_row() {
let child_table_row = child_flow.as_mut_table_row();
child_table_row.populate_collapsed_border_spacing(
collapsed_inline_direction_border_widths_for_table,
&mut collapsed_block_direction_border_widths_for_table);
} else if child_flow.is_table_rowgroup() {
let child_table_rowgroup = child_flow.as_mut_table_rowgroup();
child_table_rowgroup.populate_collapsed_border_spacing(
collapsed_inline_direction_border_widths_for_table,
&mut collapsed_block_direction_border_widths_for_table);
}
});
}
fn assign_block_size(&mut self, lc: &LayoutContext) {
debug!("assign_block_size: assigning block_size for table");
let vertical_spacing = self.spacing().vertical();
self.block_flow.assign_block_size_for_table_like_flow(vertical_spacing, lc)
}
fn compute_stacking_relative_position(&mut self, layout_context: &LayoutContext) {
self.block_flow.compute_stacking_relative_position(layout_context)
}
fn generated_containing_block_size(&self, flow: OpaqueFlow) -> LogicalSize<Au> {
self.block_flow.generated_containing_block_size(flow)
}
fn update_late_computed_inline_position_if_necessary(&mut self, inline_position: Au) {
self.block_flow.update_late_computed_inline_position_if_necessary(inline_position)
}
fn update_late_computed_block_position_if_necessary(&mut self, block_position: Au) {
self.block_flow.update_late_computed_block_position_if_necessary(block_position)
}
fn build_display_list(&mut self, state: &mut DisplayListBuildState) {
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(state, border_painting_mode);
let iter = TableCellStyleIterator::new(&self);
for mut style in iter {
style.build_display_list(state)
}
}
fn collect_stacking_contexts(&mut self, state: &mut StackingContextCollectionState) {
// Stacking contexts are collected by the table wrapper.
self.block_flow.collect_stacking_contexts_for_block(state,
StackingContextCollectionFlags::NEVER_CREATES_STACKING_CONTEXT);
}
fn repair_style(&mut self, new_style: &::ServoArc<ComputedValues>) {
self.block_flow.repair_style(new_style)
}
fn compute_overflow(&self) -> Overflow {
self.block_flow.compute_overflow()
}
fn iterate_through_fragment_border_boxes(&self,
iterator: &mut FragmentBorderBoxIterator,
level: i32,
stacking_context_position: &Point2D<Au>) {
self.block_flow.iterate_through_fragment_border_boxes(iterator, level, stacking_context_position)
}
fn mutate_fragments(&mut self, mutator: &mut FnMut(&mut Fragment)) {
self.block_flow.mutate_fragments(mutator)
}
fn print_extra_flow_children(&self, print_tree: &mut PrintTree) {
self.block_flow.print_extra_flow_children(print_tree);
}
}
#[derive(Debug)]
struct ColumnStyle<'table> {
span: u32,
colgroup_style: Option<&'table ComputedValues>,
col_style: Option<&'table ComputedValues>,
}
impl fmt::Debug for TableFlow {
/// Outputs a debugging string describing this table flow.
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "TableFlow: {:?}", self.block_flow)
}
}
/// Table, TableRowGroup, TableRow, TableCell types.
/// Their inline-sizes are calculated in the same way and do not have margins.
pub struct InternalTable;
impl ISizeAndMarginsComputer for InternalTable {
/// Compute the used value of inline-size, taking care of min-inline-size and max-inline-size.
///
/// CSS Section 10.4: Minimum and Maximum inline-sizes
fn compute_used_inline_size(
&self,
block: &mut BlockFlow,
shared_context: &SharedStyleContext,
parent_flow_inline_size: Au
) {
let mut input = self.compute_inline_size_constraint_inputs(block,
parent_flow_inline_size,
shared_context);
// Tables are always at least as wide as their minimum inline size.
let minimum_inline_size =
block.base.intrinsic_inline_sizes.minimum_inline_size -
block.fragment.border_padding.inline_start_end();
input.available_inline_size = cmp::max(input.available_inline_size, minimum_inline_size);
let solution = self.solve_inline_size_constraints(block, &input);
self.set_inline_size_constraint_solutions(block, solution);
}
/// Solve the inline-size and margins constraints for this block flow.
fn solve_inline_size_constraints(&self, _: &mut BlockFlow, input: &ISizeConstraintInput)
-> ISizeConstraintSolution {
ISizeConstraintSolution::new(input.available_inline_size, Au(0), Au(0))
}
}
/// 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
/// specific width constraint. For instance, one cell might say that it wants to be 100 pixels wide
/// in the inline direction and another cell might say that it wants to take up 20% of the inline-
/// size of the table. Now because we bubble up these constraints during the bubble-inline-sizes
/// phase of layout, we don't know yet how wide the table is ultimately going to be in the inline
/// direction. As we need to pick the maximum width of all cells for a column (in this case, the
/// maximum of 100 pixels and 20% of the table), the preceding constraint means that we must
/// potentially store both a specified width *and* a specified percentage, so that the inline-size
/// assignment phase of layout will know which one to pick.
#[derive(Clone, Copy, Debug, Serialize)]
pub struct ColumnIntrinsicInlineSize {
/// The preferred intrinsic inline size.
pub preferred: Au,
/// The largest specified size of this column as a length.
pub minimum_length: Au,
/// The largest specified size of this column as a percentage (`width` property).
pub percentage: CSSFloat,
/// Whether the column inline size is *constrained* per INTRINSIC § 4.1.
pub constrained: bool,
}
impl ColumnIntrinsicInlineSize {
/// Returns a newly-initialized `ColumnIntrinsicInlineSize` with all fields blank.
pub fn new() -> ColumnIntrinsicInlineSize {
ColumnIntrinsicInlineSize {
preferred: Au(0),
minimum_length: Au(0),
percentage: 0.0,
constrained: false,
}
}
/// Returns the higher of the two percentages specified in `self` and `other`.
pub fn greatest_percentage(&self, other: &ColumnIntrinsicInlineSize) -> CSSFloat {
if self.percentage > other.percentage {
self.percentage
} else {
other.percentage
}
}
}
/// The actual inline size for each column.
///
/// TODO(pcwalton): There will probably be some `border-collapse`-related info in here too
/// eventually.
#[derive(Clone, Copy, Debug, Serialize)]
pub struct ColumnComputedInlineSize {
/// The computed size of this inline column.
pub size: Au,
}
pub trait VecExt<T> {
fn push_or_set(&mut self, index: usize, value: T) -> &mut T;
fn get_mut_or_push(&mut self, index: usize, zero: T) -> &mut T;
}
impl<T> VecExt<T> for Vec<T> {
fn push_or_set(&mut self, index: usize, value: T) -> &mut T {
if index < self.len() {
self[index] = value
} else {
debug_assert_eq!(index, self.len());
self.push(value)
}
&mut self[index]
}
fn get_mut_or_push(&mut self, index: usize, zero: T) -> &mut T {
if index >= self.len() {
debug_assert_eq!(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>) {
// TODO mbrubeck: Take rowspan and colspan into account.
let number_of_borders_inline_direction = child_table_row.preliminary_collapsed_borders.inline.len();
// Compute interior inline borders.
for (i, this_inline_border) in child_table_row.preliminary_collapsed_borders
.inline
.iter_mut()
.enumerate() {
child_table_row.final_collapsed_borders.inline.push_or_set(i, *this_inline_border);
if i == 0 {
child_table_row.final_collapsed_borders.inline[i].combine(&table_inline_borders.start);
} else if i + 1 == number_of_borders_inline_direction {
child_table_row.final_collapsed_borders.inline[i].combine(&table_inline_borders.end);
}
let inline_spacing = inline_spacing.get_mut_or_push(i, Au(0));
*inline_spacing = cmp::max(*inline_spacing, child_table_row.final_collapsed_borders.inline[i].width)
}
// Compute block-start borders.
let block_start_borders = &mut child_table_row.final_collapsed_borders.block_start;
*block_start_borders = child_table_row.preliminary_collapsed_borders.block_start.clone();
for (i, this_border) in block_start_borders.iter_mut().enumerate() {
match previous_block_borders {
PreviousBlockCollapsedBorders::FromPreviousRow(ref previous_block_borders) => {
if previous_block_borders.len() > i {
this_border.combine(&previous_block_borders[i]);
}
}
PreviousBlockCollapsedBorders::FromTable(table_border) => {
this_border.combine(&table_border);
}
}
}
// 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_set(i, *this_block_border);
match next_block_borders {
NextBlockCollapsedBorders::FromNextRow(next_block_borders) => {
if next_block_borders.len() > i {
next_block.combine(&next_block_borders[i])
}
}
NextBlockCollapsedBorders::FromTable(ref next_block_borders) => {
next_block.combine(next_block_borders);
}
}
*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(&mut self, block_direction_spacing: Au,
layout_context: &LayoutContext);
}
impl TableLikeFlow for BlockFlow {
fn assign_block_size_for_table_like_flow(&mut self, block_direction_spacing: Au,
layout_context: &LayoutContext) {
debug_assert!(self.fragment.style.get_inheritedtable().border_collapse ==
border_collapse::T::Separate || block_direction_spacing == Au(0));
fn border_spacing_for_row(fragment: &Fragment, row: &TableRowFlow,
block_direction_spacing: Au) -> Au {
match fragment.style.get_inheritedtable().border_collapse {
border_collapse::T::Separate => block_direction_spacing,
border_collapse::T::Collapse => {
row.collapsed_border_spacing.block_start
}
}
}
if self.base.restyle_damage.contains(ServoRestyleDamage::REFLOW) {
let mut sizes = vec![Default::default()];
// The amount of border spacing up to and including this row,
// but not including the spacing beneath it
let mut cumulative_border_spacing = Au(0);
let mut incoming_rowspan_data = vec![];
let mut rowgroup_id = 0;
let mut first = true;
// First pass: Compute block-direction border spacings
// XXXManishearth this can be done in tandem with the second pass,
// provided we never hit any rowspan cases
for kid in self.base.child_iter_mut() {
if kid.is_table_row() {
// skip the first row, it is accounted for
if first {
first = false;
continue;
}
cumulative_border_spacing +=
border_spacing_for_row(&self.fragment, kid.as_table_row(),
block_direction_spacing);
sizes.push(TableRowSizeData {
// we haven't calculated sizes yet
size: Au(0),
cumulative_border_spacing,
rowgroup_id
});
} else if kid.is_table_rowgroup() && !first {
rowgroup_id += 1;
}
}
// Second pass: Compute row block sizes
// [expensive: iterates over cells]
let mut i = 0;
for kid in self.base.child_iter_mut() {
if kid.is_table_row() {
let size = kid.as_mut_table_row()
.compute_block_size_table_row_base(layout_context,
&mut incoming_rowspan_data,
&sizes,
i);
sizes[i].size = size;
i += 1;
}
}
// 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;
let mut has_rows = false;
// Third pass: Assign block sizes and positions to rows, cells, and other children
// [expensive: iterates over cells]
// At this point, `current_block_offset` is at the content edge of our box. Now iterate
// over children.
let mut i = 0;
for kid in self.base.child_iter_mut() {
if kid.is_table_row() {
has_rows = true;
let row = kid.as_mut_table_row();
row.assign_block_size_to_self_and_children(&sizes, i);
row.mut_base().restyle_damage
.remove(ServoRestyleDamage::REFLOW_OUT_OF_FLOW |
ServoRestyleDamage::REFLOW);
current_block_offset = current_block_offset +
border_spacing_for_row(&self.fragment, row,
block_direction_spacing);
i += 1;
}
// At this point, `current_block_offset` is at the border edge of the child.
kid.mut_base().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 = kid.mut_base();
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);
while let Some(candidate_block_size) = candidate_block_size_iterator.next() {
candidate_block_size_iterator.candidate_value =
match candidate_block_size {
MaybeAuto::Auto => block_size,
MaybeAuto::Specified(value) => value
};
}
// 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 +
if has_rows { block_direction_spacing } else { Au(0) };
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;
// Fourth pass: Assign absolute position info
// Write in the size of the relative containing block for children. (This information
// is also needed to handle RTL.)
for kid in self.base.child_iter_mut() {
kid.mut_base().early_absolute_position_info = EarlyAbsolutePositionInfo {
relative_containing_block_size: self.fragment.content_box().size,
relative_containing_block_mode: self.fragment.style().writing_mode,
};
}
}
self.base.restyle_damage.remove(ServoRestyleDamage::REFLOW_OUT_OF_FLOW | ServoRestyleDamage::REFLOW);
}
}
/// Inline collapsed borders for the table itself.
#[derive(Debug)]
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),
}
enum NextBlockCollapsedBorders<'a> {
FromNextRow(&'a [CollapsedBorder]),
FromTable(CollapsedBorder),
}
/// Iterator over all the rows of a table, which also
/// provides the Fragment for rowgroups if any
struct TableRowAndGroupIterator<'a> {
kids: FlowListIterator<'a>,
group: Option<(&'a Fragment, FlowListIterator<'a>)>
}
impl<'a> TableRowAndGroupIterator<'a> {
fn new(base: &'a BaseFlow) -> Self {
TableRowAndGroupIterator {
kids: base.child_iter(),
group: None,
}
}
}
impl<'a> Iterator for TableRowAndGroupIterator<'a> {
type Item = (Option<&'a Fragment>, &'a TableRowFlow);
#[inline]
fn next(&mut self) -> Option<Self::Item> {
// If we're inside a rowgroup, iterate through the rowgroup's children.
if let Some(ref mut group) = self.group {
if let Some(grandkid) = group.1.next() {
return Some((Some(group.0), grandkid.as_table_row()))
}
}
// Otherwise, iterate through the table's children.
self.group = None;
match self.kids.next() {
Some(kid) => {
if kid.is_table_rowgroup() {
let mut rowgroup = kid.as_table_rowgroup();
let iter = rowgroup.block_flow.base.child_iter();
self.group = Some((&rowgroup.block_flow.fragment, iter));
self.next()
} else if kid.is_table_row() {
Some((None, kid.as_table_row()))
} else {
self.next() // Skip children that are not rows or rowgroups
}
}
None => None
}
}
}
/// Iterator over all the rows of a table, which also
/// provides the Fragment for rowgroups if any
struct MutTableRowAndGroupIterator<'a> {
kids: MutFlowListIterator<'a>,
group: Option<(&'a Fragment, MutFlowListIterator<'a>)>
}
impl<'a> MutTableRowAndGroupIterator<'a> {
fn new(base: &'a mut BaseFlow) -> Self {
MutTableRowAndGroupIterator {
kids: base.child_iter_mut(),
group: None,
}
}
}
impl<'a> Iterator for MutTableRowAndGroupIterator<'a> {
type Item = (Option<&'a Fragment>, &'a mut TableRowFlow);
#[inline]
fn next(&mut self) -> Option<Self::Item> {
// If we're inside a rowgroup, iterate through the rowgroup's children.
if let Some(ref mut group) = self.group {
if let Some(grandkid) = group.1.next() {
return Some((Some(group.0), grandkid.as_mut_table_row()))
}
}
// Otherwise, iterate through the table's children.
self.group = None;
match self.kids.next() {
Some(kid) => {
if kid.is_table_rowgroup() {
let mut rowgroup = kid.as_mut_table_rowgroup();
let iter = rowgroup.block_flow.base.child_iter_mut();
self.group = Some((&rowgroup.block_flow.fragment, iter));
self.next()
} else if kid.is_table_row() {
Some((None, kid.as_mut_table_row()))
} else {
self.next() // Skip children that are not rows or rowgroups
}
}
None => None
}
}
}
/// Iterator over all the rows of a table
struct TableRowIterator<'a>(MutTableRowAndGroupIterator<'a>);
impl<'a> TableRowIterator<'a> {
fn new(base: &'a mut BaseFlow) -> Self {
TableRowIterator(MutTableRowAndGroupIterator::new(base))
}
}
impl<'a> Iterator for TableRowIterator<'a> {
type Item = &'a mut TableRowFlow;
#[inline]
fn next(&mut self) -> Option<Self::Item> {
self.0.next().map(|n| n.1)
}
}
/// An iterator over table cells, yielding all relevant style objects
/// for each cell
///
/// Used for correctly handling table layers from
/// https://drafts.csswg.org/css2/tables.html#table-layers
struct TableCellStyleIterator<'table> {
column_styles: Vec<ColumnStyle<'table>>,
row_iterator: TableRowAndGroupIterator<'table>,
row_info: Option<TableCellStyleIteratorRowInfo<'table>>,
column_index: TableCellColumnIndexData,
}
struct TableCellStyleIteratorRowInfo<'table> {
row: &'table TableRowFlow,
rowgroup: Option<&'table Fragment>,
cell_iterator: FlowListIterator<'table>,
}
impl<'table> TableCellStyleIterator<'table> {
fn new(table: &'table TableFlow) -> Self {
let column_styles = table.column_styles();
let mut row_iterator = TableRowAndGroupIterator::new(&table.block_flow.base);
let row_info = if let Some((group, row)) = row_iterator.next() {
Some(TableCellStyleIteratorRowInfo {
row: &row,
rowgroup: group,
cell_iterator: row.block_flow.base.child_iter()
})
} else {
None
};
TableCellStyleIterator {
column_styles, row_iterator, row_info,
column_index: Default::default(),
}
}
}
struct TableCellStyleInfo<'table> {
cell: &'table TableCellFlow,
colgroup_style: Option<&'table ComputedValues>,
col_style: Option<&'table ComputedValues>,
rowgroup_style: Option<&'table ComputedValues>,
row_style: &'table ComputedValues,
}
struct TableCellColumnIndexData {
/// Which column this is in the table
pub absolute: u32,
/// The index of the current column in column_styles
/// (i.e. which <col> element it is)
pub relative: u32,
/// In case of multispan <col>s, where we are in the
/// span of the current <col> element
pub relative_offset: u32,
}
impl Default for TableCellColumnIndexData {
fn default() -> Self {
TableCellColumnIndexData {
absolute: 0,
relative: 0,
relative_offset: 0,
}
}
}
impl TableCellColumnIndexData {
/// Moves forward by `amount` columns, updating the various indices used
///
/// This totally ignores rowspan -- if colspan and rowspan clash,
/// they just overlap, so we ignore it.
fn advance(&mut self, amount: u32, column_styles: &[ColumnStyle]) {
self.absolute += amount;
self.relative_offset += amount;
if let Some(mut current_col) =
column_styles.get(self.relative as usize) {
while self.relative_offset >= current_col.span {
// move to the next column
self.relative += 1;
self.relative_offset -= current_col.span;
if let Some(column_style) =
column_styles.get(self.relative as usize) {
current_col = column_style;
} else {
// we ran out of column_styles,
// so we don't need to update the indices
break;
}
}
}
}
}
impl<'table> Iterator for TableCellStyleIterator<'table> {
type Item = TableCellStyleInfo<'table>;
#[inline]
fn next(&mut self) -> Option<Self::Item> {
// FIXME We do this awkward .take() followed by shoving it back in
// because without NLL the row_info borrow lasts too long
if let Some(mut row_info) = self.row_info.take() {
if let Some(rowspan) = row_info.row.incoming_rowspan.get(self.column_index.absolute as usize) {
// we are not allowed to use this column as a starting point. Try the next one.
if *rowspan > 1 {
self.column_index.advance(1, &self.column_styles);
// put row_info back in
self.row_info = Some(row_info);
// try again
return self.next();
}
}
if let Some(cell) = row_info.cell_iterator.next() {
let rowgroup_style = row_info.rowgroup.map(|r| r.style());
let row_style = row_info.row.block_flow.fragment.style();
let cell = cell.as_table_cell();
let (col_style, colgroup_style) = if let Some(column_style) =
self.column_styles.get(self.column_index.relative as usize) {
let styles = (column_style.col_style.clone(), column_style.colgroup_style.clone());
self.column_index.advance(cell.column_span, &self.column_styles);
styles
} else {
(None, None)
};
// put row_info back in
self.row_info = Some(row_info);
return Some(TableCellStyleInfo {
cell,
colgroup_style,
col_style,
rowgroup_style,
row_style,
})
} else {
// next row
if let Some((group, row)) = self.row_iterator.next() {
self.row_info = Some(TableCellStyleIteratorRowInfo {
row: &row,
rowgroup: group,
cell_iterator: row.block_flow.base.child_iter()
});
self.column_index = Default::default();
self.next()
} else {
// out of rows
// row_info stays None
None
}
}
} else {
// empty table
None
}
}
}
impl<'table> TableCellStyleInfo<'table> {
fn build_display_list(&self, mut state: &mut DisplayListBuildState) {
use style::computed_values::visibility::T as Visibility;
if !self.cell.visible || self.cell.block_flow.fragment.style()
.get_inheritedbox().visibility != Visibility::Visible {
return
}
let border_painting_mode = match self.cell.block_flow
.fragment
.style
.get_inheritedtable()
.border_collapse {
border_collapse::T::Separate => BorderPaintingMode::Separate,
border_collapse::T::Collapse => BorderPaintingMode::Collapse(&self.cell.collapsed_borders),
};
{
let cell_flow = &self.cell.block_flow;
let initial = ComputedValues::initial_values();
let build_dl = |sty: &ComputedValues, state: &mut &mut DisplayListBuildState| {
let background = sty.get_background();
// Don't redraw backgrounds that we've already drawn
if background as *const Background == initial.get_background() as *const _ {
return;
}
let background_color = sty.resolve_color(background.background_color);
cell_flow.build_display_list_for_background_if_applicable_with_background(
state, background, background_color
);
};
if let Some(ref sty) = self.colgroup_style {
build_dl(&sty, &mut state);
}
if let Some(ref sty) = self.col_style {
build_dl(&sty, &mut state);
}
if let Some(ref sty) = self.rowgroup_style {
build_dl(sty, &mut state);
}
build_dl(self.row_style, &mut state);
}
// the restyle damage will be set in TableCellFlow::build_display_list()
self.cell.block_flow.build_display_list_for_block_no_damage(state, border_painting_mode)
}
}
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