mirror of
https://github.com/servo/servo.git
synced 2025-06-06 16:45:39 +00:00
b07ebbae6b
The alias is left there temporarilly and will be removed completely in a later commit where
also components/style/gecko/generated/structs_{debug|release}.rs are re-generated (they still
use the old alias).
910 lines
42 KiB
Rust
910 lines
42 KiB
Rust
/* 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 tables.
|
|
//!
|
|
//! This follows the "More Precise Definitions of Inline Layout and Table Layout" proposal written
|
|
//! by L. David Baron (Mozilla) here:
|
|
//!
|
|
//! http://dbaron.org/css/intrinsic/
|
|
//!
|
|
//! Hereafter this document is referred to as INTRINSIC.
|
|
|
|
#![deny(unsafe_code)]
|
|
|
|
use app_units::Au;
|
|
use block::{AbsoluteNonReplaced, BlockFlow, FloatNonReplaced, ISizeAndMarginsComputer, ISizeConstraintInput};
|
|
use block::{ISizeConstraintSolution, MarginsMayCollapseFlag};
|
|
use context::LayoutContext;
|
|
use display_list_builder::DisplayListBuildState;
|
|
use euclid::Point2D;
|
|
use floats::FloatKind;
|
|
use flow::{Flow, FlowClass, ImmutableFlowUtils, INLINE_POSITION_IS_STATIC, OpaqueFlow};
|
|
use fragment::{Fragment, FragmentBorderBoxIterator, Overflow};
|
|
use gfx_traits::print_tree::PrintTree;
|
|
use model::MaybeAuto;
|
|
use std::cmp::{max, min};
|
|
use std::fmt;
|
|
use std::ops::Add;
|
|
use style::computed_values::{border_collapse, position, table_layout};
|
|
use style::context::SharedStyleContext;
|
|
use style::logical_geometry::{LogicalRect, LogicalSize};
|
|
use style::properties::ComputedValues;
|
|
use style::values::CSSFloat;
|
|
use style::values::computed::LengthOrPercentageOrAuto;
|
|
use table::{ColumnComputedInlineSize, ColumnIntrinsicInlineSize};
|
|
|
|
#[derive(Copy, Clone, Serialize, Debug)]
|
|
pub enum TableLayout {
|
|
Fixed,
|
|
Auto
|
|
}
|
|
|
|
/// A table wrapper flow based on a block formatting context.
|
|
#[derive(Serialize)]
|
|
pub struct TableWrapperFlow {
|
|
pub block_flow: BlockFlow,
|
|
|
|
/// Intrinsic column inline sizes according to INTRINSIC § 4.1
|
|
pub column_intrinsic_inline_sizes: Vec<ColumnIntrinsicInlineSize>,
|
|
|
|
/// Table-layout property
|
|
pub table_layout: TableLayout,
|
|
}
|
|
|
|
impl TableWrapperFlow {
|
|
pub fn from_fragment(fragment: Fragment) -> TableWrapperFlow {
|
|
TableWrapperFlow::from_fragment_and_float_kind(fragment, None)
|
|
}
|
|
|
|
pub fn from_fragment_and_float_kind(fragment: Fragment, float_kind: Option<FloatKind>)
|
|
-> TableWrapperFlow {
|
|
let mut block_flow = BlockFlow::from_fragment_and_float_kind(fragment, float_kind);
|
|
let table_layout = if block_flow.fragment().style().get_table().table_layout ==
|
|
table_layout::T::fixed {
|
|
TableLayout::Fixed
|
|
} else {
|
|
TableLayout::Auto
|
|
};
|
|
TableWrapperFlow {
|
|
block_flow: block_flow,
|
|
column_intrinsic_inline_sizes: vec!(),
|
|
table_layout: table_layout
|
|
}
|
|
}
|
|
|
|
fn border_padding_and_spacing(&mut self) -> (Au, Au) {
|
|
let (mut table_border_padding, mut spacing) = (Au(0), Au(0));
|
|
for kid in self.block_flow.base.child_iter_mut() {
|
|
if kid.is_table() {
|
|
let kid_table = kid.as_table();
|
|
spacing = kid_table.total_horizontal_spacing();
|
|
table_border_padding =
|
|
kid_table.block_flow.fragment.border_padding.inline_start_end();
|
|
break
|
|
}
|
|
}
|
|
(table_border_padding, spacing)
|
|
}
|
|
|
|
// Instructs our first child, which is the table itself, to compute its border and padding.
|
|
//
|
|
// This is a little weird because we're computing border/padding/margins for our child,
|
|
// when normally the child computes it itself. But it has to be this way because the
|
|
// padding will affect where we place the child. This is an odd artifact of the way that
|
|
// tables are separated into table flows and table wrapper flows.
|
|
fn compute_border_and_padding_of_table(&mut self) {
|
|
let available_inline_size = self.block_flow.base.block_container_inline_size;
|
|
let border_collapse = self.block_flow.fragment.style.get_inheritedtable().border_collapse;
|
|
for kid in self.block_flow.base.child_iter_mut() {
|
|
if !kid.is_table() {
|
|
continue
|
|
}
|
|
|
|
let kid_table = kid.as_mut_table();
|
|
let kid_block_flow = &mut kid_table.block_flow;
|
|
kid_block_flow.fragment.compute_border_and_padding(available_inline_size,
|
|
border_collapse);
|
|
kid_block_flow.fragment.compute_block_direction_margins(available_inline_size);
|
|
kid_block_flow.fragment.compute_inline_direction_margins(available_inline_size);
|
|
return
|
|
}
|
|
}
|
|
|
|
/// Calculates table column sizes for automatic layout per INTRINSIC § 4.3.
|
|
fn calculate_table_column_sizes_for_automatic_layout(
|
|
&mut self,
|
|
intermediate_column_inline_sizes: &mut [IntermediateColumnInlineSize]) {
|
|
let available_inline_size = self.available_inline_size();
|
|
|
|
// Compute all the guesses for the column sizes, and sum them.
|
|
let mut total_guess = AutoLayoutCandidateGuess::new();
|
|
let guesses: Vec<AutoLayoutCandidateGuess> =
|
|
self.column_intrinsic_inline_sizes.iter().map(|column_intrinsic_inline_size| {
|
|
let guess = AutoLayoutCandidateGuess::from_column_intrinsic_inline_size(
|
|
column_intrinsic_inline_size,
|
|
available_inline_size);
|
|
total_guess = &total_guess + &guess;
|
|
guess
|
|
}).collect();
|
|
|
|
// Assign inline sizes.
|
|
let selection = SelectedAutoLayoutCandidateGuess::select(&total_guess,
|
|
available_inline_size);
|
|
let mut total_used_inline_size = Au(0);
|
|
for (intermediate_column_inline_size, guess) in
|
|
intermediate_column_inline_sizes.iter_mut().zip(guesses.iter()) {
|
|
intermediate_column_inline_size.size = guess.calculate(selection);
|
|
intermediate_column_inline_size.percentage = 0.0;
|
|
total_used_inline_size = total_used_inline_size + intermediate_column_inline_size.size
|
|
}
|
|
|
|
// Distribute excess inline-size if necessary per INTRINSIC § 4.4.
|
|
//
|
|
// FIXME(pcwalton, spec): How do I deal with fractional excess?
|
|
let excess_inline_size = available_inline_size - total_used_inline_size;
|
|
if excess_inline_size > Au(0) && selection ==
|
|
SelectedAutoLayoutCandidateGuess::UsePreferredGuessAndDistributeExcessInlineSize {
|
|
let mut info = ExcessInlineSizeDistributionInfo::new();
|
|
for column_intrinsic_inline_size in &self.column_intrinsic_inline_sizes {
|
|
info.update(column_intrinsic_inline_size)
|
|
}
|
|
|
|
let mut total_distributed_excess_size = Au(0);
|
|
for (intermediate_column_inline_size, column_intrinsic_inline_size) in
|
|
intermediate_column_inline_sizes.iter_mut()
|
|
.zip(self.column_intrinsic_inline_sizes
|
|
.iter()) {
|
|
info.distribute_excess_inline_size_to_column(intermediate_column_inline_size,
|
|
column_intrinsic_inline_size,
|
|
excess_inline_size,
|
|
&mut total_distributed_excess_size)
|
|
}
|
|
total_used_inline_size = available_inline_size
|
|
}
|
|
|
|
self.set_inline_size(total_used_inline_size)
|
|
}
|
|
|
|
fn available_inline_size(&mut self) -> Au {
|
|
let available_inline_size = self.block_flow.fragment.border_box.size.inline;
|
|
let (table_border_padding, spacing) = self.border_padding_and_spacing();
|
|
|
|
// FIXME(pcwalton, spec): INTRINSIC § 8 does not properly define how to compute this, but
|
|
// says "the basic idea is the same as the shrink-to-fit width that CSS2.1 defines". So we
|
|
// just use the shrink-to-fit inline size.
|
|
let available_inline_size = match self.block_flow.fragment.style().content_inline_size() {
|
|
LengthOrPercentageOrAuto::Auto => {
|
|
self.block_flow.get_shrink_to_fit_inline_size(available_inline_size) -
|
|
table_border_padding
|
|
}
|
|
// FIXME(mttr): This fixes #4421 without breaking our current reftests, but I'm not
|
|
// completely sure this is "correct".
|
|
//
|
|
// That said, `available_inline_size` is, as far as I can tell, equal to the table's
|
|
// computed width property (W) and is used from this point forward in a way that seems
|
|
// to correspond with CSS 2.1 § 17.5.2.2 under "Column and caption widths influence the
|
|
// final table width as follows: …"
|
|
_ => available_inline_size,
|
|
};
|
|
available_inline_size - spacing
|
|
}
|
|
|
|
fn set_inline_size(&mut self, total_used_inline_size: Au) {
|
|
let (table_border_padding, spacing) = self.border_padding_and_spacing();
|
|
self.block_flow.fragment.border_box.size.inline = total_used_inline_size +
|
|
table_border_padding + spacing;
|
|
self.block_flow.base.position.size.inline = total_used_inline_size +
|
|
table_border_padding + spacing + self.block_flow.fragment.margin.inline_start_end();
|
|
|
|
let writing_mode = self.block_flow.base.writing_mode;
|
|
let container_mode = self.block_flow.base.block_container_writing_mode;
|
|
|
|
if writing_mode.is_bidi_ltr() != container_mode.is_bidi_ltr() {
|
|
// If our "start" direction is different from our parent flow, then `border_box.start.i`
|
|
// depends on `border_box.size.inline`.
|
|
self.block_flow.fragment.border_box.start.i =
|
|
self.block_flow.base.block_container_inline_size -
|
|
self.block_flow.fragment.margin.inline_end -
|
|
self.block_flow.fragment.border_box.size.inline;
|
|
}
|
|
}
|
|
|
|
fn compute_used_inline_size(
|
|
&mut self,
|
|
shared_context: &SharedStyleContext,
|
|
parent_flow_inline_size: Au,
|
|
intermediate_column_inline_sizes: &[IntermediateColumnInlineSize]) {
|
|
let (border_padding, spacing) = self.border_padding_and_spacing();
|
|
let minimum_width_of_all_columns =
|
|
intermediate_column_inline_sizes.iter()
|
|
.fold(border_padding + spacing,
|
|
|accumulator, intermediate_column_inline_sizes| {
|
|
accumulator + intermediate_column_inline_sizes.size
|
|
});
|
|
let preferred_width_of_all_columns =
|
|
self.column_intrinsic_inline_sizes.iter()
|
|
.fold(border_padding + spacing,
|
|
|accumulator, column_intrinsic_inline_sizes| {
|
|
accumulator + column_intrinsic_inline_sizes.preferred
|
|
});
|
|
|
|
// Delegate to the appropriate inline size computer to find the constraint inputs and write
|
|
// the constraint solutions in.
|
|
let border_collapse = self.block_flow.fragment.style.get_inheritedtable().border_collapse;
|
|
if self.block_flow.base.flags.is_float() {
|
|
let inline_size_computer = FloatedTable {
|
|
minimum_width_of_all_columns: minimum_width_of_all_columns,
|
|
preferred_width_of_all_columns: preferred_width_of_all_columns,
|
|
border_collapse: border_collapse,
|
|
table_border_padding: border_padding,
|
|
};
|
|
let input =
|
|
inline_size_computer.compute_inline_size_constraint_inputs(&mut self.block_flow,
|
|
parent_flow_inline_size,
|
|
shared_context);
|
|
|
|
let solution = inline_size_computer.solve_inline_size_constraints(&mut self.block_flow,
|
|
&input);
|
|
inline_size_computer.set_inline_size_constraint_solutions(&mut self.block_flow,
|
|
solution);
|
|
inline_size_computer.set_inline_position_of_flow_if_necessary(&mut self.block_flow,
|
|
solution);
|
|
return
|
|
}
|
|
|
|
if !self.block_flow.base.flags.contains(INLINE_POSITION_IS_STATIC) {
|
|
let inline_size_computer = AbsoluteTable {
|
|
minimum_width_of_all_columns: minimum_width_of_all_columns,
|
|
preferred_width_of_all_columns: preferred_width_of_all_columns,
|
|
border_collapse: border_collapse,
|
|
table_border_padding: border_padding,
|
|
};
|
|
let input =
|
|
inline_size_computer.compute_inline_size_constraint_inputs(&mut self.block_flow,
|
|
parent_flow_inline_size,
|
|
shared_context);
|
|
|
|
let solution = inline_size_computer.solve_inline_size_constraints(&mut self.block_flow,
|
|
&input);
|
|
inline_size_computer.set_inline_size_constraint_solutions(&mut self.block_flow,
|
|
solution);
|
|
inline_size_computer.set_inline_position_of_flow_if_necessary(&mut self.block_flow,
|
|
solution);
|
|
return
|
|
}
|
|
|
|
let inline_size_computer = Table {
|
|
minimum_width_of_all_columns: minimum_width_of_all_columns,
|
|
preferred_width_of_all_columns: preferred_width_of_all_columns,
|
|
border_collapse: border_collapse,
|
|
table_border_padding: border_padding,
|
|
};
|
|
let input =
|
|
inline_size_computer.compute_inline_size_constraint_inputs(&mut self.block_flow,
|
|
parent_flow_inline_size,
|
|
shared_context);
|
|
|
|
let solution = inline_size_computer.solve_inline_size_constraints(&mut self.block_flow,
|
|
&input);
|
|
inline_size_computer.set_inline_size_constraint_solutions(&mut self.block_flow, solution);
|
|
inline_size_computer.set_inline_position_of_flow_if_necessary(&mut self.block_flow,
|
|
solution);
|
|
}
|
|
}
|
|
|
|
impl Flow for TableWrapperFlow {
|
|
fn class(&self) -> FlowClass {
|
|
FlowClass::TableWrapper
|
|
}
|
|
|
|
fn as_mut_table_wrapper(&mut self) -> &mut TableWrapperFlow {
|
|
self
|
|
}
|
|
|
|
fn as_table_wrapper(&self) -> &TableWrapperFlow {
|
|
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();
|
|
}
|
|
|
|
fn bubble_inline_sizes(&mut self) {
|
|
// Get the intrinsic column inline-sizes info from the table flow.
|
|
for kid in self.block_flow.base.child_iter_mut() {
|
|
debug_assert!(kid.is_table_caption() || kid.is_table());
|
|
if kid.is_table() {
|
|
let table = kid.as_table();
|
|
self.column_intrinsic_inline_sizes = table.column_intrinsic_inline_sizes.clone();
|
|
}
|
|
}
|
|
|
|
self.block_flow.bubble_inline_sizes();
|
|
}
|
|
|
|
fn assign_inline_sizes(&mut self, layout_context: &LayoutContext) {
|
|
debug!("assign_inline_sizes({}): assigning inline_size for flow",
|
|
if self.block_flow.base.flags.is_float() {
|
|
"floated table_wrapper"
|
|
} else {
|
|
"table_wrapper"
|
|
});
|
|
|
|
let shared_context = layout_context.shared_context();
|
|
self.block_flow.initialize_container_size_for_root(shared_context);
|
|
|
|
let mut intermediate_column_inline_sizes = self.column_intrinsic_inline_sizes
|
|
.iter()
|
|
.map(|column_intrinsic_inline_size| {
|
|
IntermediateColumnInlineSize {
|
|
size: column_intrinsic_inline_size.minimum_length,
|
|
percentage: column_intrinsic_inline_size.percentage,
|
|
}
|
|
}).collect::<Vec<_>>();
|
|
|
|
// Our inline-size was set to the inline-size of the containing block by the flow's parent.
|
|
// Now compute the real value.
|
|
let containing_block_inline_size = self.block_flow.base.block_container_inline_size;
|
|
if self.block_flow.base.flags.is_float() {
|
|
self.block_flow.float.as_mut().unwrap().containing_inline_size =
|
|
containing_block_inline_size;
|
|
}
|
|
|
|
// This has to be done before computing our inline size because `compute_used_inline_size`
|
|
// internally consults the border and padding of the table.
|
|
self.compute_border_and_padding_of_table();
|
|
|
|
self.compute_used_inline_size(shared_context,
|
|
containing_block_inline_size,
|
|
&intermediate_column_inline_sizes);
|
|
|
|
match self.table_layout {
|
|
TableLayout::Auto => {
|
|
self.calculate_table_column_sizes_for_automatic_layout(
|
|
&mut intermediate_column_inline_sizes)
|
|
}
|
|
TableLayout::Fixed => {}
|
|
}
|
|
|
|
let inline_start_content_edge = self.block_flow.fragment.border_box.start.i;
|
|
let content_inline_size = self.block_flow.fragment.border_box.size.inline;
|
|
let inline_end_content_edge = self.block_flow.fragment.border_padding.inline_end +
|
|
self.block_flow.fragment.margin.inline_end;
|
|
|
|
// In case of fixed layout, column inline-sizes are calculated in table flow.
|
|
let assigned_column_inline_sizes = match self.table_layout {
|
|
TableLayout::Fixed => None,
|
|
TableLayout::Auto => {
|
|
Some(intermediate_column_inline_sizes.iter().map(|sizes| {
|
|
ColumnComputedInlineSize {
|
|
size: sizes.size,
|
|
}
|
|
}).collect::<Vec<_>>())
|
|
}
|
|
};
|
|
|
|
match assigned_column_inline_sizes {
|
|
None => {
|
|
self.block_flow
|
|
.propagate_assigned_inline_size_to_children(shared_context,
|
|
inline_start_content_edge,
|
|
inline_end_content_edge,
|
|
content_inline_size,
|
|
|_, _, _, _, _, _| {})
|
|
}
|
|
Some(ref assigned_column_inline_sizes) => {
|
|
self.block_flow
|
|
.propagate_assigned_inline_size_to_children(shared_context,
|
|
inline_start_content_edge,
|
|
inline_end_content_edge,
|
|
content_inline_size,
|
|
|child_flow, _, _, _, _, _| {
|
|
if child_flow.class() == FlowClass::Table {
|
|
child_flow.as_mut_table().column_computed_inline_sizes =
|
|
assigned_column_inline_sizes.to_vec();
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
fn assign_block_size(&mut self, layout_context: &LayoutContext) {
|
|
debug!("assign_block_size: assigning block_size for table_wrapper");
|
|
let remaining = self.block_flow.assign_block_size_block_base(
|
|
layout_context,
|
|
None,
|
|
MarginsMayCollapseFlag::MarginsMayNotCollapse);
|
|
debug_assert!(remaining.is_none());
|
|
}
|
|
|
|
fn compute_absolute_position(&mut self, layout_context: &LayoutContext) {
|
|
self.block_flow.compute_absolute_position(layout_context)
|
|
}
|
|
|
|
fn place_float_if_applicable<'a>(&mut self) {
|
|
self.block_flow.place_float_if_applicable()
|
|
}
|
|
|
|
fn assign_block_size_for_inorder_child_if_necessary(&mut self,
|
|
layout_context: &LayoutContext,
|
|
parent_thread_id: u8,
|
|
content_box: LogicalRect<Au>)
|
|
-> bool {
|
|
self.block_flow.assign_block_size_for_inorder_child_if_necessary(layout_context,
|
|
parent_thread_id,
|
|
content_box)
|
|
}
|
|
|
|
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 generated_containing_block_size(&self, flow: OpaqueFlow) -> LogicalSize<Au> {
|
|
self.block_flow.generated_containing_block_size(flow)
|
|
}
|
|
|
|
fn build_display_list(&mut self, state: &mut DisplayListBuildState) {
|
|
self.block_flow.build_display_list(state);
|
|
}
|
|
|
|
fn collect_stacking_contexts(&mut self, state: &mut DisplayListBuildState) {
|
|
self.block_flow.collect_stacking_contexts(state);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
fn positioning(&self) -> position::T {
|
|
self.block_flow.positioning()
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for TableWrapperFlow {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
if self.block_flow.base.flags.is_float() {
|
|
write!(f, "TableWrapperFlow(Float): {:?}", self.block_flow)
|
|
} else {
|
|
write!(f, "TableWrapperFlow: {:?}", self.block_flow)
|
|
}
|
|
}
|
|
}
|
|
|
|
/// The layout "guesses" defined in INTRINSIC § 4.3.
|
|
struct AutoLayoutCandidateGuess {
|
|
/// The column inline-size assignment where each column is assigned its intrinsic minimum
|
|
/// inline-size.
|
|
minimum_guess: Au,
|
|
|
|
/// The column inline-size assignment where:
|
|
/// * A column with an intrinsic percentage inline-size greater than 0% is assigned the
|
|
/// larger of:
|
|
/// - Its intrinsic percentage inline-size times the assignable inline-size;
|
|
/// - Its intrinsic minimum inline-size;
|
|
/// * Other columns receive their intrinsic minimum inline-size.
|
|
minimum_percentage_guess: Au,
|
|
|
|
/// The column inline-size assignment where:
|
|
/// * Each column with an intrinsic percentage inline-size greater than 0% is assigned the
|
|
/// larger of:
|
|
/// - Its intrinsic percentage inline-size times the assignable inline-size;
|
|
/// - Its intrinsic minimum inline-size;
|
|
/// * Any other column that is constrained is assigned its intrinsic preferred inline-size;
|
|
/// * Other columns are assigned their intrinsic minimum inline-size.
|
|
minimum_specified_guess: Au,
|
|
|
|
/// The column inline-size assignment where:
|
|
/// * Each column with an intrinsic percentage inline-size greater than 0% is assigned the
|
|
/// larger of:
|
|
/// - Its intrinsic percentage inline-size times the assignable inline-size;
|
|
/// - Its intrinsic minimum inline-size;
|
|
/// * Other columns are assigned their intrinsic preferred inline-size.
|
|
preferred_guess: Au,
|
|
}
|
|
|
|
impl AutoLayoutCandidateGuess {
|
|
/// Creates a guess with all elements initialized to zero.
|
|
fn new() -> AutoLayoutCandidateGuess {
|
|
AutoLayoutCandidateGuess {
|
|
minimum_guess: Au(0),
|
|
minimum_percentage_guess: Au(0),
|
|
minimum_specified_guess: Au(0),
|
|
preferred_guess: Au(0),
|
|
}
|
|
}
|
|
|
|
/// Fills in the inline-size guesses for this column per INTRINSIC § 4.3.
|
|
fn from_column_intrinsic_inline_size(column_intrinsic_inline_size: &ColumnIntrinsicInlineSize,
|
|
assignable_inline_size: Au)
|
|
-> AutoLayoutCandidateGuess {
|
|
let minimum_percentage_guess =
|
|
max(assignable_inline_size.scale_by(column_intrinsic_inline_size.percentage),
|
|
column_intrinsic_inline_size.minimum_length);
|
|
AutoLayoutCandidateGuess {
|
|
minimum_guess: column_intrinsic_inline_size.minimum_length,
|
|
minimum_percentage_guess: minimum_percentage_guess,
|
|
// FIXME(pcwalton): We need the notion of *constrainedness* per INTRINSIC § 4 to
|
|
// implement this one correctly.
|
|
minimum_specified_guess: if column_intrinsic_inline_size.percentage > 0.0 {
|
|
minimum_percentage_guess
|
|
} else if column_intrinsic_inline_size.constrained {
|
|
column_intrinsic_inline_size.preferred
|
|
} else {
|
|
column_intrinsic_inline_size.minimum_length
|
|
},
|
|
preferred_guess: if column_intrinsic_inline_size.percentage > 0.0 {
|
|
minimum_percentage_guess
|
|
} else {
|
|
column_intrinsic_inline_size.preferred
|
|
},
|
|
}
|
|
}
|
|
|
|
/// Calculates the inline-size, interpolating appropriately based on the value of `selection`.
|
|
///
|
|
/// This does *not* distribute excess inline-size. That must be done later if necessary.
|
|
fn calculate(&self, selection: SelectedAutoLayoutCandidateGuess) -> Au {
|
|
match selection {
|
|
SelectedAutoLayoutCandidateGuess::UseMinimumGuess => self.minimum_guess,
|
|
SelectedAutoLayoutCandidateGuess::
|
|
InterpolateBetweenMinimumGuessAndMinimumPercentageGuess(weight) => {
|
|
interp(self.minimum_guess, self.minimum_percentage_guess, weight)
|
|
}
|
|
SelectedAutoLayoutCandidateGuess::
|
|
InterpolateBetweenMinimumPercentageGuessAndMinimumSpecifiedGuess(weight) => {
|
|
interp(self.minimum_percentage_guess, self.minimum_specified_guess, weight)
|
|
}
|
|
SelectedAutoLayoutCandidateGuess::
|
|
InterpolateBetweenMinimumSpecifiedGuessAndPreferredGuess(weight) => {
|
|
interp(self.minimum_specified_guess, self.preferred_guess, weight)
|
|
}
|
|
SelectedAutoLayoutCandidateGuess::UsePreferredGuessAndDistributeExcessInlineSize => {
|
|
self.preferred_guess
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> Add for &'a AutoLayoutCandidateGuess {
|
|
type Output = AutoLayoutCandidateGuess;
|
|
#[inline]
|
|
fn add(self, other: &AutoLayoutCandidateGuess) -> AutoLayoutCandidateGuess {
|
|
AutoLayoutCandidateGuess {
|
|
minimum_guess: self.minimum_guess + other.minimum_guess,
|
|
minimum_percentage_guess:
|
|
self.minimum_percentage_guess + other.minimum_percentage_guess,
|
|
minimum_specified_guess: self.minimum_specified_guess + other.minimum_specified_guess,
|
|
preferred_guess: self.preferred_guess + other.preferred_guess,
|
|
}
|
|
}
|
|
}
|
|
|
|
/// The `CSSFloat` member specifies the weight of the smaller of the two guesses, on a scale from
|
|
/// 0.0 to 1.0.
|
|
#[derive(Copy, Clone, PartialEq, Debug)]
|
|
enum SelectedAutoLayoutCandidateGuess {
|
|
UseMinimumGuess,
|
|
InterpolateBetweenMinimumGuessAndMinimumPercentageGuess(CSSFloat),
|
|
InterpolateBetweenMinimumPercentageGuessAndMinimumSpecifiedGuess(CSSFloat),
|
|
InterpolateBetweenMinimumSpecifiedGuessAndPreferredGuess(CSSFloat),
|
|
UsePreferredGuessAndDistributeExcessInlineSize,
|
|
}
|
|
|
|
impl SelectedAutoLayoutCandidateGuess {
|
|
/// See INTRINSIC § 4.3.
|
|
///
|
|
/// FIXME(pcwalton, INTRINSIC spec): INTRINSIC doesn't specify whether these are exclusive or
|
|
/// inclusive ranges.
|
|
fn select(guess: &AutoLayoutCandidateGuess, assignable_inline_size: Au)
|
|
-> SelectedAutoLayoutCandidateGuess {
|
|
if assignable_inline_size < guess.minimum_guess {
|
|
SelectedAutoLayoutCandidateGuess::UseMinimumGuess
|
|
} else if assignable_inline_size < guess.minimum_percentage_guess {
|
|
let weight = weight(guess.minimum_guess,
|
|
assignable_inline_size,
|
|
guess.minimum_percentage_guess);
|
|
SelectedAutoLayoutCandidateGuess::InterpolateBetweenMinimumGuessAndMinimumPercentageGuess(weight)
|
|
} else if assignable_inline_size < guess.minimum_specified_guess {
|
|
let weight = weight(guess.minimum_percentage_guess,
|
|
assignable_inline_size,
|
|
guess.minimum_specified_guess);
|
|
SelectedAutoLayoutCandidateGuess::InterpolateBetweenMinimumPercentageGuessAndMinimumSpecifiedGuess(weight)
|
|
} else if assignable_inline_size < guess.preferred_guess {
|
|
let weight = weight(guess.minimum_specified_guess,
|
|
assignable_inline_size,
|
|
guess.preferred_guess);
|
|
SelectedAutoLayoutCandidateGuess::InterpolateBetweenMinimumSpecifiedGuessAndPreferredGuess(weight)
|
|
} else {
|
|
SelectedAutoLayoutCandidateGuess::UsePreferredGuessAndDistributeExcessInlineSize
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Computes the weight needed to linearly interpolate `middle` between two guesses `low` and
|
|
/// `high` as specified by INTRINSIC § 4.3.
|
|
fn weight(low: Au, middle: Au, high: Au) -> CSSFloat {
|
|
(middle - low).to_f32_px() / (high - low).to_f32_px()
|
|
}
|
|
|
|
/// Linearly interpolates between two guesses, as specified by INTRINSIC § 4.3.
|
|
fn interp(low: Au, high: Au, weight: CSSFloat) -> Au {
|
|
low + (high - low).scale_by(weight)
|
|
}
|
|
|
|
struct ExcessInlineSizeDistributionInfo {
|
|
preferred_inline_size_of_nonconstrained_columns_with_no_percentage: Au,
|
|
count_of_nonconstrained_columns_with_no_percentage: u32,
|
|
preferred_inline_size_of_constrained_columns_with_no_percentage: Au,
|
|
total_percentage: CSSFloat,
|
|
column_count: u32,
|
|
}
|
|
|
|
impl ExcessInlineSizeDistributionInfo {
|
|
fn new() -> ExcessInlineSizeDistributionInfo {
|
|
ExcessInlineSizeDistributionInfo {
|
|
preferred_inline_size_of_nonconstrained_columns_with_no_percentage: Au(0),
|
|
count_of_nonconstrained_columns_with_no_percentage: 0,
|
|
preferred_inline_size_of_constrained_columns_with_no_percentage: Au(0),
|
|
total_percentage: 0.0,
|
|
column_count: 0,
|
|
}
|
|
}
|
|
|
|
fn update(&mut self, column_intrinsic_inline_size: &ColumnIntrinsicInlineSize) {
|
|
if !column_intrinsic_inline_size.constrained &&
|
|
column_intrinsic_inline_size.percentage == 0.0 {
|
|
self.preferred_inline_size_of_nonconstrained_columns_with_no_percentage =
|
|
self.preferred_inline_size_of_nonconstrained_columns_with_no_percentage +
|
|
column_intrinsic_inline_size.preferred;
|
|
self.count_of_nonconstrained_columns_with_no_percentage += 1
|
|
}
|
|
if column_intrinsic_inline_size.constrained &&
|
|
column_intrinsic_inline_size.percentage == 0.0 {
|
|
self.preferred_inline_size_of_constrained_columns_with_no_percentage =
|
|
self.preferred_inline_size_of_constrained_columns_with_no_percentage +
|
|
column_intrinsic_inline_size.preferred
|
|
}
|
|
self.total_percentage += column_intrinsic_inline_size.percentage;
|
|
self.column_count += 1
|
|
}
|
|
|
|
/// Based on the information here, distributes excess inline-size to the given column per
|
|
/// INTRINSIC § 4.4.
|
|
///
|
|
/// `#[inline]` so the compiler will hoist out the branch, which is loop-invariant.
|
|
#[inline]
|
|
fn distribute_excess_inline_size_to_column(
|
|
&self,
|
|
intermediate_column_inline_size: &mut IntermediateColumnInlineSize,
|
|
column_intrinsic_inline_size: &ColumnIntrinsicInlineSize,
|
|
excess_inline_size: Au,
|
|
total_distributed_excess_size: &mut Au) {
|
|
let proportion =
|
|
if self.preferred_inline_size_of_nonconstrained_columns_with_no_percentage > Au(0) {
|
|
// FIXME(spec, pcwalton): Gecko and WebKit do *something* here when there are
|
|
// nonconstrained columns with no percentage *and* no preferred width. What do they
|
|
// do?
|
|
if !column_intrinsic_inline_size.constrained &&
|
|
column_intrinsic_inline_size.percentage == 0.0 {
|
|
column_intrinsic_inline_size.preferred.to_f32_px() /
|
|
self.preferred_inline_size_of_nonconstrained_columns_with_no_percentage
|
|
.to_f32_px()
|
|
} else {
|
|
0.0
|
|
}
|
|
} else if self.count_of_nonconstrained_columns_with_no_percentage > 0 {
|
|
1.0 / (self.count_of_nonconstrained_columns_with_no_percentage as CSSFloat)
|
|
} else if self.preferred_inline_size_of_constrained_columns_with_no_percentage >
|
|
Au(0) {
|
|
column_intrinsic_inline_size.preferred.to_f32_px() /
|
|
self.preferred_inline_size_of_constrained_columns_with_no_percentage.to_f32_px()
|
|
} else if self.total_percentage > 0.0 {
|
|
column_intrinsic_inline_size.percentage / self.total_percentage
|
|
} else {
|
|
1.0 / (self.column_count as CSSFloat)
|
|
};
|
|
|
|
// The `min` here has the effect of throwing away fractional excess at the end of the
|
|
// table.
|
|
let amount_to_distribute = min(excess_inline_size.scale_by(proportion),
|
|
excess_inline_size - *total_distributed_excess_size);
|
|
*total_distributed_excess_size = *total_distributed_excess_size + amount_to_distribute;
|
|
intermediate_column_inline_size.size = intermediate_column_inline_size.size +
|
|
amount_to_distribute
|
|
}
|
|
}
|
|
|
|
/// An intermediate column size assignment.
|
|
struct IntermediateColumnInlineSize {
|
|
size: Au,
|
|
percentage: f32,
|
|
}
|
|
|
|
/// Returns the computed inline size of the table wrapper represented by `block`.
|
|
///
|
|
/// `table_border_padding` is the sum of the sizes of all border and padding in the inline
|
|
/// direction of the table contained within this table wrapper.
|
|
fn initial_computed_inline_size(block: &mut BlockFlow,
|
|
containing_block_inline_size: Au,
|
|
minimum_width_of_all_columns: Au,
|
|
preferred_width_of_all_columns: Au,
|
|
table_border_padding: Au)
|
|
-> MaybeAuto {
|
|
let inline_size_from_style = MaybeAuto::from_style(block.fragment.style.content_inline_size(),
|
|
containing_block_inline_size);
|
|
match inline_size_from_style {
|
|
MaybeAuto::Auto => {
|
|
if preferred_width_of_all_columns + table_border_padding <= containing_block_inline_size {
|
|
MaybeAuto::Specified(preferred_width_of_all_columns + table_border_padding)
|
|
} else if minimum_width_of_all_columns > containing_block_inline_size {
|
|
MaybeAuto::Specified(minimum_width_of_all_columns)
|
|
} else {
|
|
MaybeAuto::Auto
|
|
}
|
|
}
|
|
MaybeAuto::Specified(inline_size_from_style) => {
|
|
MaybeAuto::Specified(max(inline_size_from_style - table_border_padding,
|
|
minimum_width_of_all_columns))
|
|
}
|
|
}
|
|
}
|
|
|
|
struct Table {
|
|
minimum_width_of_all_columns: Au,
|
|
preferred_width_of_all_columns: Au,
|
|
border_collapse: border_collapse::T,
|
|
table_border_padding: Au,
|
|
}
|
|
|
|
impl ISizeAndMarginsComputer for Table {
|
|
fn compute_border_and_padding(&self, block: &mut BlockFlow, containing_block_inline_size: Au) {
|
|
block.fragment.compute_border_and_padding(containing_block_inline_size,
|
|
self.border_collapse)
|
|
}
|
|
|
|
fn initial_computed_inline_size(&self,
|
|
block: &mut BlockFlow,
|
|
parent_flow_inline_size: Au,
|
|
shared_context: &SharedStyleContext)
|
|
-> MaybeAuto {
|
|
let containing_block_inline_size =
|
|
self.containing_block_inline_size(block, parent_flow_inline_size, shared_context);
|
|
initial_computed_inline_size(block,
|
|
containing_block_inline_size,
|
|
self.minimum_width_of_all_columns,
|
|
self.preferred_width_of_all_columns,
|
|
self.table_border_padding)
|
|
}
|
|
|
|
fn solve_inline_size_constraints(&self,
|
|
block: &mut BlockFlow,
|
|
input: &ISizeConstraintInput)
|
|
-> ISizeConstraintSolution {
|
|
self.solve_block_inline_size_constraints(block, input)
|
|
}
|
|
}
|
|
|
|
struct FloatedTable {
|
|
minimum_width_of_all_columns: Au,
|
|
preferred_width_of_all_columns: Au,
|
|
border_collapse: border_collapse::T,
|
|
table_border_padding: Au,
|
|
}
|
|
|
|
impl ISizeAndMarginsComputer for FloatedTable {
|
|
fn compute_border_and_padding(&self, block: &mut BlockFlow, containing_block_inline_size: Au) {
|
|
block.fragment.compute_border_and_padding(containing_block_inline_size,
|
|
self.border_collapse)
|
|
}
|
|
|
|
fn initial_computed_inline_size(&self,
|
|
block: &mut BlockFlow,
|
|
parent_flow_inline_size: Au,
|
|
shared_context: &SharedStyleContext)
|
|
-> MaybeAuto {
|
|
let containing_block_inline_size =
|
|
self.containing_block_inline_size(block,
|
|
parent_flow_inline_size,
|
|
shared_context);
|
|
initial_computed_inline_size(block,
|
|
containing_block_inline_size,
|
|
self.minimum_width_of_all_columns,
|
|
self.preferred_width_of_all_columns,
|
|
self.table_border_padding)
|
|
}
|
|
|
|
fn solve_inline_size_constraints(&self,
|
|
block: &mut BlockFlow,
|
|
input: &ISizeConstraintInput)
|
|
-> ISizeConstraintSolution {
|
|
FloatNonReplaced.solve_inline_size_constraints(block, input)
|
|
}
|
|
}
|
|
|
|
struct AbsoluteTable {
|
|
minimum_width_of_all_columns: Au,
|
|
preferred_width_of_all_columns: Au,
|
|
border_collapse: border_collapse::T,
|
|
table_border_padding: Au,
|
|
}
|
|
|
|
impl ISizeAndMarginsComputer for AbsoluteTable {
|
|
fn compute_border_and_padding(&self, block: &mut BlockFlow, containing_block_inline_size: Au) {
|
|
block.fragment.compute_border_and_padding(containing_block_inline_size,
|
|
self.border_collapse)
|
|
}
|
|
|
|
fn initial_computed_inline_size(&self,
|
|
block: &mut BlockFlow,
|
|
parent_flow_inline_size: Au,
|
|
shared_context: &SharedStyleContext)
|
|
-> MaybeAuto {
|
|
let containing_block_inline_size =
|
|
self.containing_block_inline_size(block,
|
|
parent_flow_inline_size,
|
|
shared_context);
|
|
initial_computed_inline_size(block,
|
|
containing_block_inline_size,
|
|
self.minimum_width_of_all_columns,
|
|
self.preferred_width_of_all_columns,
|
|
self.table_border_padding)
|
|
}
|
|
|
|
fn containing_block_inline_size(&self,
|
|
block: &mut BlockFlow,
|
|
parent_flow_inline_size: Au,
|
|
shared_context: &SharedStyleContext)
|
|
-> Au {
|
|
AbsoluteNonReplaced.containing_block_inline_size(block,
|
|
parent_flow_inline_size,
|
|
shared_context)
|
|
}
|
|
|
|
fn solve_inline_size_constraints(&self,
|
|
block: &mut BlockFlow,
|
|
input: &ISizeConstraintInput)
|
|
-> ISizeConstraintSolution {
|
|
AbsoluteNonReplaced.solve_inline_size_constraints(block, input)
|
|
}
|
|
|
|
fn set_inline_position_of_flow_if_necessary(&self,
|
|
block: &mut BlockFlow,
|
|
solution: ISizeConstraintSolution) {
|
|
AbsoluteNonReplaced.set_inline_position_of_flow_if_necessary(block, solution);
|
|
}
|
|
|
|
}
|