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layout: Rewrite intrinsic inline-size and automatic table layout to

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match L. David Baron's work-in-progress specification.

    http://dbaron.org/css/intrinsic/

Column spans are not yet supported.

This effectively adds support for percentage widths, and it also fixes
many bugs, improving the layout of Google and Wikipedia.
This commit is contained in:
Patrick Walton 2014-10-14 14:17:57 -07:00
parent c9ce56a85d
commit c7e619dfe7
20 changed files with 1081 additions and 618 deletions
Download patch file Download diff file Expand all files Collapse all files

144
components/layout/table_row.rs
View file

@ -14,27 +14,22 @@ use flow::{TableRowFlowClass, FlowClass, Flow, ImmutableFlowUtils};
use flow;
use fragment::Fragment;
use layout_debug;
use table::InternalTable;
use table::{ColumnInlineSize, InternalTable};
use model::{MaybeAuto, Specified, Auto};
use wrapper::ThreadSafeLayoutNode;
use servo_util::geometry::Au;
use std::cmp::max;
use std::fmt;
use style::computed_values::{LPA_Auto, LPA_Length, LPA_Percentage};
/// A table formatting context.
/// A single row of a table.
#[deriving(Encodable)]
pub struct TableRowFlow {
pub block_flow: BlockFlow,
/// Column inline-sizes.
pub col_inline_sizes: Vec<Au>,
/// Column min inline-sizes.
pub col_min_inline_sizes: Vec<Au>,
/// Column pref inline-sizes.
pub col_pref_inline_sizes: Vec<Au>,
/// Information about the inline-sizes of each column.
pub column_inline_sizes: Vec<ColumnInlineSize>,
}
impl TableRowFlow {
@ -43,9 +38,7 @@ impl TableRowFlow {
-> TableRowFlow {
TableRowFlow {
block_flow: BlockFlow::from_node_and_fragment(node, fragment),
col_inline_sizes: vec!(),
col_min_inline_sizes: vec!(),
col_pref_inline_sizes: vec!(),
column_inline_sizes: Vec::new()
}
}
@ -54,9 +47,7 @@ impl TableRowFlow {
-> TableRowFlow {
TableRowFlow {
block_flow: BlockFlow::from_node(constructor, node),
col_inline_sizes: vec!(),
col_min_inline_sizes: vec!(),
col_pref_inline_sizes: vec!(),
column_inline_sizes: Vec::new()
}
}
@ -65,8 +56,8 @@ impl TableRowFlow {
}
fn initialize_offsets(&mut self) -> (Au, Au, Au) {
// TODO: If border-collapse: collapse, block-start_offset, block-end_offset, and inline-start_offset
// should be updated. Currently, they are set as Au(0).
// TODO: If border-collapse: collapse, block_start_offset, block_end_offset, and
// inline_start_offset should be updated. Currently, they are set as Au(0).
(Au(0), Au(0), Au(0))
}
@ -82,19 +73,21 @@ impl TableRowFlow {
let /* mut */ cur_y = block_start_offset;
// Per CSS 2.1 § 17.5.3, find max_y = max( computed `block-size`, minimum block-size of all cells )
let mut max_y = Au::new(0);
// Per CSS 2.1 § 17.5.3, find max_y = max(computed `block-size`, minimum block-size of all
// cells).
let mut max_y = Au(0);
for kid in self.block_flow.base.child_iter() {
kid.assign_block_size_for_inorder_child_if_necessary(layout_context);
{
let child_fragment = kid.as_table_cell().fragment();
// TODO: Percentage block-size
let child_specified_block_size = MaybeAuto::from_style(child_fragment.style().content_block_size(),
Au::new(0)).specified_or_zero();
max_y =
max(max_y,
child_specified_block_size + child_fragment.border_padding.block_start_end());
let child_specified_block_size =
MaybeAuto::from_style(child_fragment.style().content_block_size(),
Au::new(0)).specified_or_zero();
max_y = max(max_y,
child_specified_block_size +
child_fragment.border_padding.block_start_end());
}
let child_node = flow::mut_base(kid);
child_node.position.start.b = cur_y;
@ -103,7 +96,11 @@ impl TableRowFlow {
let mut block_size = max_y;
// TODO: Percentage block-size
block_size = match MaybeAuto::from_style(self.block_flow.fragment.style().content_block_size(), Au(0)) {
block_size = match MaybeAuto::from_style(self.block_flow
.fragment
.style()
.content_block_size(),
Au(0)) {
Auto => block_size,
Specified(value) => max(value, block_size)
};
@ -153,70 +150,84 @@ impl Flow for TableRowFlow {
&mut self.block_flow
}
fn col_inline_sizes<'a>(&'a mut self) -> &'a mut Vec<Au> {
&mut self.col_inline_sizes
fn column_inline_sizes<'a>(&'a mut self) -> &'a mut Vec<ColumnInlineSize> {
&mut self.column_inline_sizes
}
fn col_min_inline_sizes<'a>(&'a self) -> &'a Vec<Au> {
&self.col_min_inline_sizes
}
fn col_pref_inline_sizes<'a>(&'a self) -> &'a Vec<Au> {
&self.col_pref_inline_sizes
}
/// Recursively (bottom-up) determines the context's preferred and minimum inline-sizes. When called
/// on this context, all child contexts have had their min/pref inline-sizes set. This function must
/// decide min/pref inline-sizes based on child context inline-sizes and dimensions of any fragments it is
/// responsible for flowing.
/// Recursively (bottom-up) determines the context's preferred and minimum inline-sizes. When
/// called on this context, all child contexts have had their min/pref inline-sizes set. This
/// function must decide min/pref inline-sizes based on child context inline-sizes and
/// dimensions of any fragments it is responsible for flowing.
/// Min/pref inline-sizes set by this function are used in automatic table layout calculation.
/// The specified column inline-sizes of children cells are used in fixed table layout calculation.
/// The specified column inline-sizes of children cells are used in fixed table layout
/// calculation.
fn bubble_inline_sizes(&mut self) {
let _scope = layout_debug_scope!("table_row::bubble_inline_sizes {:s}",
self.block_flow.base.debug_id());
self.block_flow.base.debug_id());
let mut min_inline_size = Au(0);
let mut pref_inline_size = Au(0);
/* find the specified inline_sizes from child table-cell contexts */
// Bubble up the specified inline-sizes from child table cells.
let (mut min_inline_size, mut pref_inline_size) = (Au(0), Au(0));
for kid in self.block_flow.base.child_iter() {
assert!(kid.is_table_cell());
// collect the specified column inline-sizes of cells. These are used in fixed table layout calculation.
{
let child_fragment = kid.as_table_cell().fragment();
let child_specified_inline_size = MaybeAuto::from_style(child_fragment.style().content_inline_size(),
Au::new(0)).specified_or_zero();
self.col_inline_sizes.push(child_specified_inline_size);
}
// Collect the specified column inline-size of the cell. This is used in both fixed and
// automatic table layout calculation.
let child_specified_inline_size = kid.as_table_cell()
.fragment()
.style()
.content_inline_size();
// collect min_inline-size & pref_inline-size of children cells for automatic table layout calculation.
// Collect minimum and preferred inline-sizes of the cell for automatic table layout
// calculation.
let child_base = flow::mut_base(kid);
self.col_min_inline_sizes.push(child_base.intrinsic_inline_sizes.minimum_inline_size);
self.col_pref_inline_sizes.push(child_base.intrinsic_inline_sizes.preferred_inline_size);
min_inline_size = min_inline_size + child_base.intrinsic_inline_sizes.minimum_inline_size;
pref_inline_size = pref_inline_size + child_base.intrinsic_inline_sizes.preferred_inline_size;
let child_column_inline_size = ColumnInlineSize {
minimum_length: match child_specified_inline_size {
LPA_Auto | LPA_Percentage(_) => {
child_base.intrinsic_inline_sizes.minimum_inline_size
}
LPA_Length(length) => length,
},
percentage: match child_specified_inline_size {
LPA_Auto | LPA_Length(_) => 0.0,
LPA_Percentage(percentage) => percentage,
},
preferred: child_base.intrinsic_inline_sizes.preferred_inline_size,
constrained: match child_specified_inline_size {
LPA_Length(_) => true,
LPA_Auto | LPA_Percentage(_) => false,
},
};
min_inline_size = min_inline_size + child_column_inline_size.minimum_length;
pref_inline_size = pref_inline_size + child_column_inline_size.preferred;
self.column_inline_sizes.push(child_column_inline_size);
}
self.block_flow.base.intrinsic_inline_sizes.minimum_inline_size = min_inline_size;
self.block_flow.base.intrinsic_inline_sizes.preferred_inline_size = max(
min_inline_size, pref_inline_size);
self.block_flow.base.intrinsic_inline_sizes.preferred_inline_size = max(min_inline_size,
pref_inline_size);
}
/// 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.
/// 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, ctx: &LayoutContext) {
let _scope = layout_debug_scope!("table_row::assign_inline_sizes {:s}",
self.block_flow.base.debug_id());
self.block_flow.base.debug_id());
debug!("assign_inline_sizes({}): assigning inline_size for flow", "table_row");
// The position was set to the containing block by the flow's parent.
let containing_block_inline_size = self.block_flow.base.block_container_inline_size;
// FIXME: In case of border-collapse: collapse, inline-start_content_edge should be border-inline-start
let inline_start_content_edge = Au::new(0);
// FIXME: In case of border-collapse: collapse, inline_start_content_edge should be
// border_inline_start.
let inline_start_content_edge = Au(0);
let inline_size_computer = InternalTable;
inline_size_computer.compute_used_inline_size(&mut self.block_flow, ctx, containing_block_inline_size);
inline_size_computer.compute_used_inline_size(&mut self.block_flow,
ctx,
containing_block_inline_size);
self.block_flow.propagate_assigned_inline_size_to_children(inline_start_content_edge, Au(0), Some(self.col_inline_sizes.clone()));
self.block_flow
.propagate_assigned_inline_size_to_children(inline_start_content_edge,
containing_block_inline_size,
Some(self.column_inline_sizes.as_slice()));
}
fn assign_block_size<'a>(&mut self, ctx: &'a LayoutContext<'a>) {
@ -242,3 +253,4 @@ impl fmt::Show for TableRowFlow {
write!(f, "TableRowFlow: {}", self.block_flow.fragment)
}
}