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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

109
components/layout/block.rs
View file

@ -29,7 +29,8 @@
use context::LayoutContext;
use css::node_style::StyledNode;
use display_list_builder::{BlockFlowDisplayListBuilding, FragmentDisplayListBuilding};
use display_list_builder::{BlockFlowDisplayListBuilding, BorderPaintingMode};
use display_list_builder::{FragmentDisplayListBuilding};
use floats::{ClearType, FloatKind, Floats, PlacementInfo};
use flow::{self, AbsolutePositionInfo, BaseFlow, ForceNonfloatedFlag, FlowClass, Flow};
use flow::{ImmutableFlowUtils, MutableFlowUtils, PreorderFlowTraversal};
@ -44,7 +45,6 @@ use incremental::{REFLOW, REFLOW_OUT_OF_FLOW};
use layout_debug;
use model::{IntrinsicISizes, MarginCollapseInfo};
use model::{MaybeAuto, CollapsibleMargins, specified, specified_or_none};
use table;
use wrapper::ThreadSafeLayoutNode;
use geom::{Point2D, Rect, Size2D};
@ -54,12 +54,13 @@ use rustc_serialize::{Encoder, Encodable};
use std::cmp::{max, min};
use std::fmt;
use std::sync::Arc;
use style::computed_values::{overflow_x, overflow_y, position, box_sizing, display, float};
use style::computed_values::{border_collapse, box_sizing, display, float, overflow_x, overflow_y};
use style::computed_values::{position};
use style::properties::ComputedValues;
use style::values::computed::{LengthOrPercentage, LengthOrPercentageOrAuto};
use style::values::computed::{LengthOrPercentageOrNone};
use util::geometry::{Au, MAX_AU};
use util::logical_geometry::{LogicalPoint, LogicalRect, LogicalSize};
use util::logical_geometry::{LogicalPoint, LogicalRect, LogicalSize, WritingMode};
use util::opts;
/// Information specific to floated blocks.
@ -621,44 +622,51 @@ impl BlockFlow {
/// Compute the actual inline size and position for this block.
pub fn compute_used_inline_size(&mut self,
layout_context: &LayoutContext,
containing_block_inline_size: Au) {
containing_block_inline_size: Au,
border_collapse: border_collapse::T) {
let block_type = self.block_type();
match block_type {
BlockType::AbsoluteReplaced => {
let inline_size_computer = AbsoluteReplaced;
inline_size_computer.compute_used_inline_size(self,
layout_context,
containing_block_inline_size);
containing_block_inline_size,
border_collapse);
}
BlockType::AbsoluteNonReplaced => {
let inline_size_computer = AbsoluteNonReplaced;
inline_size_computer.compute_used_inline_size(self,
layout_context,
containing_block_inline_size);
containing_block_inline_size,
border_collapse);
}
BlockType::FloatReplaced => {
let inline_size_computer = FloatReplaced;
inline_size_computer.compute_used_inline_size(self,
layout_context,
containing_block_inline_size);
containing_block_inline_size,
border_collapse);
}
BlockType::FloatNonReplaced => {
let inline_size_computer = FloatNonReplaced;
inline_size_computer.compute_used_inline_size(self,
layout_context,
containing_block_inline_size);
containing_block_inline_size,
border_collapse);
}
BlockType::Replaced => {
let inline_size_computer = BlockReplaced;
inline_size_computer.compute_used_inline_size(self,
layout_context,
containing_block_inline_size);
containing_block_inline_size,
border_collapse);
}
BlockType::NonReplaced => {
let inline_size_computer = BlockNonReplaced;
inline_size_computer.compute_used_inline_size(self,
layout_context,
containing_block_inline_size);
containing_block_inline_size,
border_collapse);
}
}
}
@ -1193,27 +1201,37 @@ impl BlockFlow {
/// Compute inline size based using the `block_container_inline_size` set by the parent flow.
///
/// This is run in the `AssignISizes` traversal.
pub fn propagate_and_compute_used_inline_size(&mut self, layout_context: &LayoutContext) {
fn propagate_and_compute_used_inline_size(&mut self,
layout_context: &LayoutContext,
border_collapse: border_collapse::T) {
let containing_block_inline_size = self.base.block_container_inline_size;
self.compute_used_inline_size(layout_context, containing_block_inline_size);
self.compute_used_inline_size(layout_context,
containing_block_inline_size,
border_collapse);
if self.base.flags.is_float() {
self.float.as_mut().unwrap().containing_inline_size = containing_block_inline_size;
self.float.as_mut().unwrap().containing_inline_size = containing_block_inline_size
}
}
/// Assigns the computed inline-start content edge and inline-size to all the children of this
/// block flow. Also computes whether each child will be impacted by floats.
/// block flow. Also computes whether each child will be impacted by floats. The given
/// `callback`, if supplied, will be called once per child; it is currently used to push down
/// column sizes for tables.
///
/// `#[inline(always)]` because this is called only from block or table inline-size assignment
/// and the code for block layout is significantly simpler.
#[inline(always)]
pub fn propagate_assigned_inline_size_to_children(
&mut self,
layout_context: &LayoutContext,
inline_start_content_edge: Au,
inline_end_content_edge: Au,
content_inline_size: Au,
table_info: Option<table::ChildInlineSizeInfo>) {
pub fn propagate_assigned_inline_size_to_children<F>(&mut self,
layout_context: &LayoutContext,
inline_start_content_edge: Au,
inline_end_content_edge: Au,
content_inline_size: Au,
mut callback: F)
where F: FnMut(&mut Flow,
usize,
Au,
WritingMode,
&mut Au) {
// Keep track of whether floats could impact each child.
let mut inline_start_floats_impact_child =
self.base.flags.contains(IMPACTED_BY_LEFT_FLOATS);
@ -1277,13 +1295,10 @@ impl BlockFlow {
let containing_block_mode = self.base.writing_mode;
// This value is used only for table cells.
let mut inline_start_margin_edge = if table_info.is_some() {
inline_start_content_edge
} else {
Au(0)
};
let mut inline_start_margin_edge = inline_start_content_edge;
for (i, kid) in self.base.child_iter().enumerate() {
let mut iterator = self.base.child_iter().enumerate().peekable();
while let Some((i, kid)) = iterator.next() {
{
let kid_base = flow::mut_base(kid);
kid_base.block_container_explicit_block_size = explicit_content_size;
@ -1350,14 +1365,13 @@ impl BlockFlow {
inline_size_of_preceding_right_floats;
}
// Handle tables.
if let Some(ref table_info) = table_info {
table_info.propagate_to_child(kid,
i,
content_inline_size,
containing_block_mode,
&mut inline_start_margin_edge);
}
// Call the callback to propagate extra inline size information down to the child. This
// is currently used for tables.
callback(kid,
i,
content_inline_size,
containing_block_mode,
&mut inline_start_margin_edge);
// Per CSS 2.1 § 16.3.1, text alignment propagates to all children in flow.
//
@ -1575,7 +1589,7 @@ impl Flow for BlockFlow {
// Our inline-size was set to the inline-size of the containing block by the flow's parent.
// Now compute the real value.
self.propagate_and_compute_used_inline_size(layout_context);
self.propagate_and_compute_used_inline_size(layout_context, border_collapse::T::separate);
// Formatting contexts are never impacted by floats.
match self.formatting_context_type() {
@ -1617,7 +1631,7 @@ impl Flow for BlockFlow {
inline_start_content_edge,
inline_end_content_edge,
content_inline_size,
None);
|_, _, _, _, _| {});
}
fn place_float_if_applicable<'a>(&mut self, _: &'a LayoutContext<'a>) {
@ -1906,7 +1920,9 @@ impl Flow for BlockFlow {
}
fn build_display_list(&mut self, layout_context: &LayoutContext) {
self.build_display_list_for_block(box DisplayList::new(), layout_context);
self.build_display_list_for_block(box DisplayList::new(),
layout_context,
BorderPaintingMode::Separate);
if opts::get().validate_display_list_geometry {
self.base.validate_display_list_geometry();
}
@ -2031,14 +2047,15 @@ pub trait ISizeAndMarginsComputer {
fn compute_inline_size_constraint_inputs(&self,
block: &mut BlockFlow,
parent_flow_inline_size: Au,
layout_context: &LayoutContext)
layout_context: &LayoutContext,
border_collapse: border_collapse::T)
-> ISizeConstraintInput {
let containing_block_inline_size =
self.containing_block_inline_size(block, parent_flow_inline_size, layout_context);
block.fragment.compute_block_direction_margins(containing_block_inline_size);
block.fragment.compute_inline_direction_margins(containing_block_inline_size);
block.fragment.compute_border_and_padding(containing_block_inline_size);
block.fragment.compute_border_and_padding(containing_block_inline_size, border_collapse);
let mut computed_inline_size = self.initial_computed_inline_size(block,
parent_flow_inline_size,
@ -2165,10 +2182,12 @@ pub trait ISizeAndMarginsComputer {
fn compute_used_inline_size(&self,
block: &mut BlockFlow,
layout_context: &LayoutContext,
parent_flow_inline_size: Au) {
parent_flow_inline_size: Au,
border_collapse: border_collapse::T) {
let mut input = self.compute_inline_size_constraint_inputs(block,
parent_flow_inline_size,
layout_context);
layout_context,
border_collapse);
let containing_block_inline_size =
self.containing_block_inline_size(block, parent_flow_inline_size, layout_context);
@ -2617,7 +2636,9 @@ impl ISizeAndMarginsComputer for BlockReplaced {
-> ISizeConstraintSolution {
match input.computed_inline_size {
MaybeAuto::Specified(_) => {},
MaybeAuto::Auto => panic!("BlockReplaced: inline_size should have been computed by now")
MaybeAuto::Auto => {
panic!("BlockReplaced: inline_size should have been computed by now")
}
};
self.solve_block_inline_size_constraints(block, input)
}