700cec3f7e
fixes #20092 This just contains the first steps. We apply a naive algorithm: Spanning cells apply a pressure equal to `block_size / rowspan` on each row they are in. We move table row block size computation into the tables, and make it two pass. In the first pass we compute the sizes of each row, and in the second pass we assign them, adding them up for any involved cells. This is missing: - [x] Accounting for border sizes - [x] Applying pressure to rows that are not the row containing the cell - [ ] Reducing pressure on future rows if the current row is able to accomodate more of the cell - [x] For tables containing both rows and rowgroups, reset the rowspan info when we hit a rowgroup - [x] Correctly handle overflowing rowspans cc @mbrubeck @pcwalton Source-Repo: https://github.com/servo/servo Source-Revision: e2f28140184e9124bd9e94d0b15f289ec5258822
446 lines
18 KiB
Rust
446 lines
18 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_code)]
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use app_units::Au;
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use block::{BlockFlow, ISizeAndMarginsComputer, MarginsMayCollapseFlag};
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use context::LayoutContext;
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use display_list::{BlockFlowDisplayListBuilding, DisplayListBuildState};
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use display_list::{StackingContextCollectionFlags, StackingContextCollectionState};
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use euclid::{Point2D, Rect, SideOffsets2D, Size2D};
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use flow::{Flow, FlowClass, FlowFlags, GetBaseFlow, OpaqueFlow};
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use fragment::{Fragment, FragmentBorderBoxIterator, Overflow};
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use gfx_traits::print_tree::PrintTree;
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use layout_debug;
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use model::MaybeAuto;
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use script_layout_interface::wrapper_traits::ThreadSafeLayoutNode;
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use std::fmt;
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use style::logical_geometry::{LogicalMargin, LogicalRect, LogicalSize, WritingMode};
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use style::properties::ComputedValues;
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use style::values::computed::Color;
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use style::values::generics::box_::VerticalAlign;
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use style::values::specified::BorderStyle;
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use table::InternalTable;
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use table_row::{CollapsedBorder, CollapsedBorderProvenance};
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#[allow(unsafe_code)]
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unsafe impl ::flow::HasBaseFlow for TableCellFlow {}
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/// A table formatting context.
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#[derive(Serialize)]
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#[repr(C)]
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pub struct TableCellFlow {
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/// Data common to all block flows.
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pub block_flow: BlockFlow,
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/// Border collapse information for the cell.
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pub collapsed_borders: CollapsedBordersForCell,
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/// The column span of this cell.
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pub column_span: u32,
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/// The rows spanned by this cell.
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pub row_span: u32,
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/// Whether this cell is visible. If false, the value of `empty-cells` means that we must not
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/// display this cell.
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pub visible: bool,
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}
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impl TableCellFlow {
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pub fn from_fragment(fragment: Fragment) -> TableCellFlow {
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TableCellFlow {
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block_flow: BlockFlow::from_fragment(fragment),
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collapsed_borders: CollapsedBordersForCell::new(),
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column_span: 1,
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row_span: 1,
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visible: true,
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}
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}
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pub fn from_node_fragment_and_visibility_flag<N: ThreadSafeLayoutNode>(
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node: &N, fragment: Fragment, visible: bool) -> TableCellFlow {
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TableCellFlow {
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block_flow: BlockFlow::from_fragment(fragment),
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collapsed_borders: CollapsedBordersForCell::new(),
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column_span: node.get_colspan(),
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row_span: node.get_rowspan(),
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visible: visible,
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}
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}
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pub fn fragment(&mut self) -> &Fragment {
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&self.block_flow.fragment
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}
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pub fn mut_fragment(&mut self) -> &mut Fragment {
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&mut self.block_flow.fragment
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}
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/// Assign block-size for table-cell flow.
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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_cell_base(&mut self, layout_context: &LayoutContext) {
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let remaining = self.block_flow.assign_block_size_block_base(
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layout_context,
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None,
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MarginsMayCollapseFlag::MarginsMayNotCollapse);
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debug_assert!(remaining.is_none());
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}
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/// Position this cell's children according to vertical-align.
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pub fn valign_children(&mut self) {
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// Note to the reader: this code has been tested with negative margins.
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// We end up with a "end" that's before the "start," but the math still works out.
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let mut extents = None;
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for kid in self.base().children.iter() {
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let kid_base = kid.base();
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if kid_base.flags.contains(FlowFlags::IS_ABSOLUTELY_POSITIONED) {
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continue
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}
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let start = kid_base.position.start.b -
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kid_base.collapsible_margins.block_start_margin_for_noncollapsible_context();
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let end = kid_base.position.start.b + kid_base.position.size.block +
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kid_base.collapsible_margins.block_end_margin_for_noncollapsible_context();
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match extents {
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Some((ref mut first_start, ref mut last_end)) => {
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if start < *first_start {
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*first_start = start
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}
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if end > *last_end {
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*last_end = end
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}
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}
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None => extents = Some((start, end)),
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}
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}
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let (first_start, last_end) = match extents {
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Some(extents) => extents,
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None => return,
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};
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let kids_size = last_end - first_start;
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let self_size = self.base().position.size.block -
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self.block_flow.fragment.border_padding.block_start_end();
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let kids_self_gap = self_size - kids_size;
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// This offset should also account for VerticalAlign::Baseline.
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// Need max cell ascent from the first row of this cell.
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let offset = match self.block_flow.fragment.style().get_box().vertical_align {
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VerticalAlign::Middle => kids_self_gap / 2,
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VerticalAlign::Bottom => kids_self_gap,
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_ => Au(0),
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};
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if offset == Au(0) {
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return
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}
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for kid in self.mut_base().children.iter_mut() {
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let kid_base = kid.mut_base();
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if !kid_base.flags.contains(FlowFlags::IS_ABSOLUTELY_POSITIONED) {
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kid_base.position.start.b += offset
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}
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}
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}
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// Total block size of child
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//
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// Call after block size calculation
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pub fn total_block_size(&mut self) -> Au {
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// TODO: Percentage block-size
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let specified = MaybeAuto::from_style(self.fragment().style()
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.content_block_size(),
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Au(0)).specified_or_zero();
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specified + self.fragment().border_padding.block_start_end()
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}
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}
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impl Flow for TableCellFlow {
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fn class(&self) -> FlowClass {
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FlowClass::TableCell
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}
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fn as_mut_table_cell(&mut self) -> &mut TableCellFlow {
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self
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}
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fn as_table_cell(&self) -> &TableCellFlow {
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self
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}
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fn as_mut_block(&mut self) -> &mut BlockFlow {
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&mut self.block_flow
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}
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fn as_block(&self) -> &BlockFlow {
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&self.block_flow
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}
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/// Minimum/preferred inline-sizes set by this function are used in automatic 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_cell::bubble_inline_sizes {:x}",
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self.block_flow.base.debug_id());
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self.block_flow.bubble_inline_sizes_for_block(true);
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let specified_inline_size = MaybeAuto::from_style(self.block_flow
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.fragment
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.style()
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.content_inline_size(),
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Au(0)).specified_or_zero();
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if self.block_flow.base.intrinsic_inline_sizes.minimum_inline_size <
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specified_inline_size {
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self.block_flow.base.intrinsic_inline_sizes.minimum_inline_size = specified_inline_size
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}
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if self.block_flow.base.intrinsic_inline_sizes.preferred_inline_size <
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self.block_flow.base.intrinsic_inline_sizes.minimum_inline_size {
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self.block_flow.base.intrinsic_inline_sizes.preferred_inline_size =
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self.block_flow.base.intrinsic_inline_sizes.minimum_inline_size;
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}
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}
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/// Recursively (top-down) determines the actual inline-size of child contexts and fragments.
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/// When called on this context, the context has had its inline-size set by the parent table
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/// row.
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fn assign_inline_sizes(&mut self, layout_context: &LayoutContext) {
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let _scope = layout_debug_scope!("table_cell::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_cell");
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let shared_context = layout_context.shared_context();
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// The position was set to the column inline-size by the parent flow, table row flow.
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let containing_block_inline_size = self.block_flow.base.block_container_inline_size;
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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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shared_context,
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containing_block_inline_size);
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let inline_start_content_edge =
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self.block_flow.fragment.border_box.start.i +
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self.block_flow.fragment.border_padding.inline_start;
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let inline_end_content_edge =
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self.block_flow.base.block_container_inline_size -
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self.block_flow.fragment.border_padding.inline_start_end() -
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self.block_flow.fragment.border_box.size.inline;
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let padding_and_borders = self.block_flow.fragment.border_padding.inline_start_end();
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let content_inline_size =
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self.block_flow.fragment.border_box.size.inline - padding_and_borders;
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self.block_flow.propagate_assigned_inline_size_to_children(shared_context,
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inline_start_content_edge,
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inline_end_content_edge,
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content_inline_size,
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|_, _, _, _, _, _| {});
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}
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fn assign_block_size(&mut self, layout_context: &LayoutContext) {
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debug!("assign_block_size: assigning block_size for table_cell");
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self.assign_block_size_table_cell_base(layout_context);
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}
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fn compute_stacking_relative_position(&mut self, layout_context: &LayoutContext) {
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self.block_flow.compute_stacking_relative_position(layout_context)
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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, _: &mut DisplayListBuildState) {
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use style::servo::restyle_damage::ServoRestyleDamage;
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// This is handled by TableCellStyleInfo::build_display_list()
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// when the containing table builds its display list
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// we skip setting the damage in TableCellStyleInfo::build_display_list()
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// because we only have immutable access
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self.block_flow.fragment.restyle_damage.remove(ServoRestyleDamage::REPAINT);
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}
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fn collect_stacking_contexts(&mut self, state: &mut StackingContextCollectionState) {
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self.block_flow.collect_stacking_contexts_for_block(state,
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StackingContextCollectionFlags::empty());
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}
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fn repair_style(&mut self, new_style: &::ServoArc<ComputedValues>) {
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self.block_flow.repair_style(new_style)
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}
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fn compute_overflow(&self) -> Overflow {
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self.block_flow.compute_overflow()
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}
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fn contains_roots_of_absolute_flow_tree(&self) -> bool {
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self.block_flow.contains_roots_of_absolute_flow_tree()
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}
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fn is_absolute_containing_block(&self) -> bool {
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self.block_flow.is_absolute_containing_block()
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}
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fn generated_containing_block_size(&self, flow: OpaqueFlow) -> LogicalSize<Au> {
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self.block_flow.generated_containing_block_size(flow)
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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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level: i32,
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stacking_context_position: &Point2D<Au>) {
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self.block_flow.iterate_through_fragment_border_boxes(iterator, level, stacking_context_position)
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}
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fn mutate_fragments(&mut self, mutator: &mut FnMut(&mut Fragment)) {
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self.block_flow.mutate_fragments(mutator)
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}
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fn print_extra_flow_children(&self, print_tree: &mut PrintTree) {
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self.block_flow.print_extra_flow_children(print_tree);
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}
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}
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impl fmt::Debug for TableCellFlow {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "TableCellFlow: {:?}", self.block_flow)
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}
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}
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#[derive(Clone, Copy, Debug, Serialize)]
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pub struct CollapsedBordersForCell {
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pub inline_start_border: CollapsedBorder,
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pub inline_end_border: CollapsedBorder,
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pub block_start_border: CollapsedBorder,
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pub block_end_border: CollapsedBorder,
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pub inline_start_width: Au,
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pub inline_end_width: Au,
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pub block_start_width: Au,
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pub block_end_width: Au,
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}
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impl CollapsedBordersForCell {
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fn new() -> CollapsedBordersForCell {
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CollapsedBordersForCell {
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inline_start_border: CollapsedBorder::new(),
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inline_end_border: CollapsedBorder::new(),
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block_start_border: CollapsedBorder::new(),
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block_end_border: CollapsedBorder::new(),
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inline_start_width: Au(0),
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inline_end_width: Au(0),
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block_start_width: Au(0),
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block_end_width: Au(0),
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}
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}
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fn should_paint_inline_start_border(&self) -> bool {
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self.inline_start_border.provenance != CollapsedBorderProvenance::FromPreviousTableCell
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}
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fn should_paint_inline_end_border(&self) -> bool {
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self.inline_end_border.provenance != CollapsedBorderProvenance::FromNextTableCell
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}
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fn should_paint_block_start_border(&self) -> bool {
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self.block_start_border.provenance != CollapsedBorderProvenance::FromPreviousTableCell
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}
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fn should_paint_block_end_border(&self) -> bool {
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self.block_end_border.provenance != CollapsedBorderProvenance::FromNextTableCell
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}
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pub fn adjust_border_widths_for_painting(&self, border_widths: &mut LogicalMargin<Au>) {
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border_widths.inline_start = if !self.should_paint_inline_start_border() {
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Au(0)
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} else {
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self.inline_start_border.width
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};
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border_widths.inline_end = if !self.should_paint_inline_end_border() {
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Au(0)
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} else {
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self.inline_end_border.width
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};
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border_widths.block_start = if !self.should_paint_block_start_border() {
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Au(0)
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} else {
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self.block_start_border.width
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};
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border_widths.block_end = if !self.should_paint_block_end_border() {
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Au(0)
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} else {
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self.block_end_border.width
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}
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}
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pub fn adjust_border_bounds_for_painting(&self,
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border_bounds: &mut Rect<Au>,
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writing_mode: WritingMode) {
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let inline_start_divisor = if self.should_paint_inline_start_border() {
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2
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} else {
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-2
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};
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let inline_start_offset = self.inline_start_width / 2 + self.inline_start_border.width /
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inline_start_divisor;
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let inline_end_divisor = if self.should_paint_inline_end_border() {
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2
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} else {
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-2
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};
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let inline_end_offset = self.inline_end_width / 2 + self.inline_end_border.width /
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inline_end_divisor;
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let block_start_divisor = if self.should_paint_block_start_border() {
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2
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} else {
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-2
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};
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let block_start_offset = self.block_start_width / 2 + self.block_start_border.width /
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block_start_divisor;
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let block_end_divisor = if self.should_paint_block_end_border() {
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2
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} else {
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-2
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};
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let block_end_offset = self.block_end_width / 2 + self.block_end_border.width /
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block_end_divisor;
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// FIXME(pcwalton): Get the real container size.
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let mut logical_bounds =
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LogicalRect::from_physical(writing_mode, *border_bounds, Size2D::new(Au(0), Au(0)));
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logical_bounds.start.i = logical_bounds.start.i - inline_start_offset;
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logical_bounds.start.b = logical_bounds.start.b - block_start_offset;
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logical_bounds.size.inline = logical_bounds.size.inline + inline_start_offset +
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inline_end_offset;
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logical_bounds.size.block = logical_bounds.size.block + block_start_offset +
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block_end_offset;
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*border_bounds = logical_bounds.to_physical(writing_mode, Size2D::new(Au(0), Au(0)))
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}
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pub fn adjust_border_colors_and_styles_for_painting(
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&self,
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border_colors: &mut SideOffsets2D<Color>,
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border_styles: &mut SideOffsets2D<BorderStyle>,
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writing_mode: WritingMode) {
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let logical_border_colors = LogicalMargin::new(writing_mode,
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self.block_start_border.color,
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self.inline_end_border.color,
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self.block_end_border.color,
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self.inline_start_border.color);
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*border_colors = logical_border_colors.to_physical(writing_mode);
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let logical_border_styles = LogicalMargin::new(writing_mode,
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self.block_start_border.style,
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self.inline_end_border.style,
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self.block_end_border.style,
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self.inline_start_border.style);
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*border_styles = logical_border_styles.to_physical(writing_mode);
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}
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}
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