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https://github.com/servo/servo.git
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340 lines
14 KiB
Rust
340 lines
14 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! CSS table formatting contexts.
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#![deny(unsafe_blocks)]
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use block::BlockFlow;
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use block::ISizeAndMarginsComputer;
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use construct::FlowConstructor;
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use context::LayoutContext;
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use flow::{FlowClass, Flow, ImmutableFlowUtils};
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use flow;
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use fragment::{Fragment, FragmentBorderBoxIterator};
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use layout_debug;
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use table::{ColumnComputedInlineSize, ColumnIntrinsicInlineSize, InternalTable};
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use model::MaybeAuto;
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use wrapper::ThreadSafeLayoutNode;
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use geom::{Point2D, Rect};
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use util::geometry::Au;
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use util::logical_geometry::LogicalRect;
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use std::cmp::max;
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use std::fmt;
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use style::properties::ComputedValues;
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use style::values::computed::LengthOrPercentageOrAuto;
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use std::sync::Arc;
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/// A single row of a table.
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#[derive(RustcEncodable)]
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pub struct TableRowFlow {
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pub block_flow: BlockFlow,
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/// Information about the intrinsic inline-sizes of each cell.
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pub cell_intrinsic_inline_sizes: Vec<CellIntrinsicInlineSize>,
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/// Information about the computed inline-sizes of each column.
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pub column_computed_inline_sizes: Vec<ColumnComputedInlineSize>,
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}
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/// Information about the column inline size and span for each cell.
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#[derive(RustcEncodable, Copy)]
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pub struct CellIntrinsicInlineSize {
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/// Inline sizes that this cell contributes to the column.
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pub column_size: ColumnIntrinsicInlineSize,
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/// The column span of this cell.
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pub column_span: u32,
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}
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impl TableRowFlow {
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pub fn from_node_and_fragment(node: &ThreadSafeLayoutNode,
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fragment: Fragment)
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-> TableRowFlow {
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TableRowFlow {
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block_flow: BlockFlow::from_node_and_fragment(node, fragment),
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cell_intrinsic_inline_sizes: Vec::new(),
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column_computed_inline_sizes: Vec::new(),
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}
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}
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pub fn from_node(constructor: &mut FlowConstructor,
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node: &ThreadSafeLayoutNode)
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-> TableRowFlow {
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TableRowFlow {
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block_flow: BlockFlow::from_node(constructor, node),
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cell_intrinsic_inline_sizes: Vec::new(),
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column_computed_inline_sizes: Vec::new()
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}
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}
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pub fn fragment<'a>(&'a mut self) -> &'a Fragment {
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&self.block_flow.fragment
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}
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fn initialize_offsets(&mut self) -> (Au, Au, Au) {
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// TODO: If border-collapse: collapse, block_start_offset, block_end_offset, and
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// inline_start_offset should be updated. Currently, they are set as Au(0).
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(Au(0), Au(0), Au(0))
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}
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/// Assign block-size for table-row flow.
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///
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/// TODO(pcwalton): This doesn't handle floats and positioned elements right.
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///
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/// inline(always) because this is only ever called by in-order or non-in-order top-level
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/// methods
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#[inline(always)]
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fn assign_block_size_table_row_base<'a>(&mut self, layout_context: &'a LayoutContext<'a>) {
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let (block_start_offset, _, _) = self.initialize_offsets();
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let /* mut */ cur_y = block_start_offset;
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// Per CSS 2.1 § 17.5.3, find max_y = max(computed `block-size`, minimum block-size of all
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// cells).
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let mut max_y = Au(0);
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let thread_id = self.block_flow.base.thread_id;
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for kid in self.block_flow.base.child_iter() {
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kid.place_float_if_applicable(layout_context);
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if !flow::base(kid).flags.is_float() {
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kid.assign_block_size_for_inorder_child_if_necessary(layout_context, thread_id);
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}
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{
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let child_fragment = kid.as_table_cell().fragment();
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// TODO: Percentage block-size
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let child_specified_block_size =
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MaybeAuto::from_style(child_fragment.style().content_block_size(),
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Au::new(0)).specified_or_zero();
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max_y = max(max_y,
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child_specified_block_size +
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child_fragment.border_padding.block_start_end());
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}
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let child_node = flow::mut_base(kid);
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child_node.position.start.b = cur_y;
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max_y = max(max_y, child_node.position.size.block);
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}
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let mut block_size = max_y;
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// TODO: Percentage block-size
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block_size = match MaybeAuto::from_style(self.block_flow
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.fragment
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.style()
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.content_block_size(),
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Au(0)) {
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MaybeAuto::Auto => block_size,
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MaybeAuto::Specified(value) => max(value, block_size)
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};
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// cur_y = cur_y + block-size;
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// Assign the block-size of own fragment
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//
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// FIXME(pcwalton): Take `cur_y` into account.
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let mut position = self.block_flow.fragment.border_box;
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position.size.block = block_size;
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self.block_flow.fragment.border_box = position;
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self.block_flow.base.position.size.block = block_size;
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// Assign the block-size of kid fragments, which is the same value as own block-size.
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for kid in self.block_flow.base.child_iter() {
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{
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let kid_fragment = kid.as_table_cell().mut_fragment();
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let mut position = kid_fragment.border_box;
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position.size.block = block_size;
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kid_fragment.border_box = position;
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}
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let child_node = flow::mut_base(kid);
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child_node.position.size.block = block_size;
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}
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}
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}
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impl Flow for TableRowFlow {
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fn class(&self) -> FlowClass {
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FlowClass::TableRow
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}
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fn as_table_row<'a>(&'a mut self) -> &'a mut TableRowFlow {
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self
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}
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fn as_immutable_table_row<'a>(&'a self) -> &'a TableRowFlow {
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self
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}
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fn as_block<'a>(&'a mut self) -> &'a mut BlockFlow {
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&mut self.block_flow
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}
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fn column_intrinsic_inline_sizes<'a>(&'a mut self) -> &'a mut Vec<ColumnIntrinsicInlineSize> {
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panic!("can't call column_intrinsic_inline_sizes() on table row")
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}
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fn column_computed_inline_sizes<'a>(&'a mut self) -> &'a mut Vec<ColumnComputedInlineSize> {
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&mut self.column_computed_inline_sizes
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}
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/// Recursively (bottom-up) determines the context's preferred and minimum inline-sizes. When
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/// called on this context, all child contexts have had their min/pref inline-sizes set. This
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/// function must decide min/pref inline-sizes based on child context inline-sizes and
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/// dimensions of any fragments it is responsible for flowing.
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/// Min/pref inline-sizes set by this function are used in automatic table layout calculation.
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/// The specified column inline-sizes of children cells are used in fixed table layout
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/// calculation.
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fn bubble_inline_sizes(&mut self) {
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let _scope = layout_debug_scope!("table_row::bubble_inline_sizes {:x}",
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self.block_flow.base.debug_id());
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// Bubble up the specified inline-sizes from child table cells.
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let (mut min_inline_size, mut pref_inline_size) = (Au(0), Au(0));
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for kid in self.block_flow.base.child_iter() {
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assert!(kid.is_table_cell());
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// Collect the specified column inline-size of the cell. This is used in both fixed and
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// automatic table layout calculation.
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let child_specified_inline_size;
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let child_column_span;
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{
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let child_table_cell = kid.as_table_cell();
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child_specified_inline_size = child_table_cell.fragment()
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.style()
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.content_inline_size();
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child_column_span = child_table_cell.column_span
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}
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// Collect minimum and preferred inline-sizes of the cell for automatic table layout
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// calculation.
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let child_base = flow::mut_base(kid);
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let child_column_inline_size = ColumnIntrinsicInlineSize {
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minimum_length: match child_specified_inline_size {
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LengthOrPercentageOrAuto::Auto | LengthOrPercentageOrAuto::Percentage(_) => {
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child_base.intrinsic_inline_sizes.minimum_inline_size
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}
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LengthOrPercentageOrAuto::Length(length) => length,
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},
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percentage: match child_specified_inline_size {
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LengthOrPercentageOrAuto::Auto | LengthOrPercentageOrAuto::Length(_) => 0.0,
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LengthOrPercentageOrAuto::Percentage(percentage) => percentage,
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},
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preferred: child_base.intrinsic_inline_sizes.preferred_inline_size,
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constrained: match child_specified_inline_size {
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LengthOrPercentageOrAuto::Length(_) => true,
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LengthOrPercentageOrAuto::Auto | LengthOrPercentageOrAuto::Percentage(_) => false,
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},
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};
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min_inline_size = min_inline_size + child_column_inline_size.minimum_length;
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pref_inline_size = pref_inline_size + child_column_inline_size.preferred;
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self.cell_intrinsic_inline_sizes.push(CellIntrinsicInlineSize {
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column_size: child_column_inline_size,
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column_span: child_column_span,
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});
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}
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self.block_flow.base.intrinsic_inline_sizes.minimum_inline_size = min_inline_size;
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self.block_flow.base.intrinsic_inline_sizes.preferred_inline_size = max(min_inline_size,
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pref_inline_size);
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}
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fn assign_inline_sizes(&mut self, layout_context: &LayoutContext) {
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let _scope = layout_debug_scope!("table_row::assign_inline_sizes {:x}",
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self.block_flow.base.debug_id());
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debug!("assign_inline_sizes({}): assigning inline_size for flow", "table_row");
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// The position was set to the containing block by the flow's parent.
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let containing_block_inline_size = self.block_flow.base.block_container_inline_size;
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// FIXME: In case of border-collapse: collapse, inline_start_content_edge should be
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// border_inline_start.
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let inline_start_content_edge = Au(0);
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let inline_size_computer = InternalTable;
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inline_size_computer.compute_used_inline_size(&mut self.block_flow,
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layout_context,
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containing_block_inline_size);
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// Spread out the completed inline sizes among columns with spans > 1.
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let mut computed_inline_size_for_cells = Vec::new();
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let mut column_computed_inline_size_iterator = self.column_computed_inline_sizes.iter();
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for cell_intrinsic_inline_size in self.cell_intrinsic_inline_sizes.iter() {
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// Start with the computed inline size for the first column in the span.
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let mut column_computed_inline_size =
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match column_computed_inline_size_iterator.next() {
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Some(column_computed_inline_size) => *column_computed_inline_size,
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None => {
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// We're in fixed layout mode and there are more cells in this row than
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// columns we know about. According to CSS 2.1 § 17.5.2.1, the behavior is
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// now undefined. So just use zero.
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//
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// FIXME(pcwalton): $10 says this isn't Web compatible.
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ColumnComputedInlineSize {
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size: Au(0),
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}
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}
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};
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// Add in computed inline sizes for any extra columns in the span.
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for _ in range(1, cell_intrinsic_inline_size.column_span) {
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let extra_column_computed_inline_size =
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match column_computed_inline_size_iterator.next() {
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Some(column_computed_inline_size) => column_computed_inline_size,
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None => break,
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};
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column_computed_inline_size.size = column_computed_inline_size.size +
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extra_column_computed_inline_size.size;
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}
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computed_inline_size_for_cells.push(column_computed_inline_size)
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}
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// Push those inline sizes down to the cells.
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self.block_flow.propagate_assigned_inline_size_to_children(
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layout_context,
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inline_start_content_edge,
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containing_block_inline_size,
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Some(computed_inline_size_for_cells.as_slice()));
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}
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fn assign_block_size<'a>(&mut self, ctx: &'a LayoutContext<'a>) {
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debug!("assign_block_size: assigning block_size for table_row");
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self.assign_block_size_table_row_base(ctx);
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}
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fn compute_absolute_position(&mut self) {
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self.block_flow.compute_absolute_position()
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}
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fn update_late_computed_inline_position_if_necessary(&mut self, inline_position: Au) {
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self.block_flow.update_late_computed_inline_position_if_necessary(inline_position)
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}
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fn update_late_computed_block_position_if_necessary(&mut self, block_position: Au) {
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self.block_flow.update_late_computed_block_position_if_necessary(block_position)
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}
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fn build_display_list(&mut self, layout_context: &LayoutContext) {
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self.block_flow.build_display_list(layout_context)
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}
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fn repair_style(&mut self, new_style: &Arc<ComputedValues>) {
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self.block_flow.repair_style(new_style)
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}
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fn compute_overflow(&self) -> Rect<Au> {
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self.block_flow.compute_overflow()
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}
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fn generated_containing_block_rect(&self) -> LogicalRect<Au> {
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self.block_flow.generated_containing_block_rect()
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}
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fn iterate_through_fragment_border_boxes(&self,
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iterator: &mut FragmentBorderBoxIterator,
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stacking_context_position: &Point2D<Au>) {
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self.block_flow.iterate_through_fragment_border_boxes(iterator, stacking_context_position)
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}
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}
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impl fmt::Debug for TableRowFlow {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "TableRowFlow: {:?}", self.block_flow.fragment)
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}
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}
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