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table_rowgroup.rs
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table_rowgroup.rs
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/* 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 table formatting contexts.
use layout::box_::Box;
use layout::block::BlockFlow;
use layout::block::WidthAndMarginsComputer;
use layout::construct::FlowConstructor;
use layout::context::LayoutContext;
use layout::flow::{TableRowGroupFlowClass, FlowClass, Flow, ImmutableFlowUtils};
use layout::flow;
use layout::table::{InternalTable, TableFlow};
use layout::wrapper::ThreadSafeLayoutNode;
use servo_util::geometry::Au;
use servo_util::geometry;
/// A table formatting context.
pub struct TableRowGroupFlow {
pub block_flow: BlockFlow,
/// Column widths
pub col_widths: Vec<Au>,
/// Column min widths.
pub col_min_widths: Vec<Au>,
/// Column pref widths.
pub col_pref_widths: Vec<Au>,
}
impl TableRowGroupFlow {
pub fn from_node_and_box(node: &ThreadSafeLayoutNode,
box_: Box)
-> TableRowGroupFlow {
TableRowGroupFlow {
block_flow: BlockFlow::from_node_and_box(node, box_),
col_widths: Vec::new(),
col_min_widths: Vec::new(),
col_pref_widths: Vec::new(),
}
}
pub fn from_node(constructor: &mut FlowConstructor,
node: &ThreadSafeLayoutNode)
-> TableRowGroupFlow {
TableRowGroupFlow {
block_flow: BlockFlow::from_node(constructor, node),
col_widths: Vec::new(),
col_min_widths: Vec::new(),
col_pref_widths: Vec::new(),
}
}
pub fn teardown(&mut self) {
self.block_flow.teardown();
self.col_widths = Vec::new();
self.col_min_widths = Vec::new();
self.col_pref_widths = Vec::new();
}
pub fn box_<'a>(&'a mut self) -> &'a Box {
&self.block_flow.box_
}
fn initialize_offsets(&mut self) -> (Au, Au, Au) {
// TODO: If border-collapse: collapse, top_offset, bottom_offset, and left_offset
// should be updated. Currently, they are set as Au(0).
(Au(0), Au(0), Au(0))
}
/// Assign height for table-rowgroup flow.
///
/// FIXME(pcwalton): This doesn't handle floats right.
///
/// inline(always) because this is only ever called by in-order or non-in-order top-level
/// methods
#[inline(always)]
fn assign_height_table_rowgroup_base(&mut self, layout_context: &mut LayoutContext) {
let (top_offset, _, _) = self.initialize_offsets();
let mut cur_y = top_offset;
for kid in self.block_flow.base.child_iter() {
kid.assign_height_for_inorder_child_if_necessary(layout_context);
let child_node = flow::mut_base(kid);
child_node.position.origin.y = cur_y;
cur_y = cur_y + child_node.position.size.height;
}
let height = cur_y - top_offset;
let mut position = self.block_flow.box_.border_box;
position.size.height = height;
self.block_flow.box_.border_box = position;
self.block_flow.base.position.size.height = height;
}
pub fn build_display_list_table_rowgroup(&mut self, layout_context: &LayoutContext) {
debug!("build_display_list_table_rowgroup: same process as block flow");
self.block_flow.build_display_list_block(layout_context)
}
}
impl Flow for TableRowGroupFlow {
fn class(&self) -> FlowClass {
TableRowGroupFlowClass
}
fn as_table_rowgroup<'a>(&'a mut self) -> &'a mut TableRowGroupFlow {
self
}
fn as_block<'a>(&'a mut self) -> &'a mut BlockFlow {
&mut self.block_flow
}
fn col_widths<'a>(&'a mut self) -> &'a mut Vec<Au> {
&mut self.col_widths
}
fn col_min_widths<'a>(&'a self) -> &'a Vec<Au> {
&self.col_min_widths
}
fn col_pref_widths<'a>(&'a self) -> &'a Vec<Au> {
&self.col_pref_widths
}
/// Recursively (bottom-up) determines the context's preferred and minimum widths. When called
/// on this context, all child contexts have had their min/pref widths set. This function must
/// decide min/pref widths based on child context widths and dimensions of any boxes it is
/// responsible for flowing.
/// Min/pref widths set by this function are used in automatic table layout calculation.
/// Also, this function finds the specified column widths from the first row.
/// Those are used in fixed table layout calculation
fn bubble_widths(&mut self, _: &mut LayoutContext) {
let mut min_width = Au(0);
let mut pref_width = Au(0);
for kid in self.block_flow.base.child_iter() {
assert!(kid.is_table_row());
// calculate min_width & pref_width for automatic table layout calculation
// 'self.col_min_widths' collects the maximum value of cells' min-widths for each column.
// 'self.col_pref_widths' collects the maximum value of cells' pref-widths for each column.
if self.col_widths.is_empty() { // First Row
assert!(self.col_min_widths.is_empty() && self.col_pref_widths.is_empty());
// 'self.col_widths' collects the specified column widths from the first table-row for fixed table layout calculation.
self.col_widths = kid.col_widths().clone();
self.col_min_widths = kid.col_min_widths().clone();
self.col_pref_widths = kid.col_pref_widths().clone();
} else {
min_width = TableFlow::update_col_widths(&mut self.col_min_widths, kid.col_min_widths());
pref_width = TableFlow::update_col_widths(&mut self.col_pref_widths, kid.col_pref_widths());
// update the number of column widths from table-rows.
let num_cols = self.col_widths.len();
let num_child_cols = kid.col_min_widths().len();
for i in range(num_cols, num_child_cols) {
self.col_widths.push(Au::new(0));
let new_kid_min = *kid.col_min_widths().get(i);
self.col_min_widths.push(*kid.col_min_widths().get(i));
let new_kid_pref = *kid.col_pref_widths().get(i);
self.col_pref_widths.push(*kid.col_pref_widths().get(i));
min_width = min_width + new_kid_min;
pref_width = pref_width + new_kid_pref;
}
}
}
self.block_flow.base.intrinsic_widths.minimum_width = min_width;
self.block_flow.base.intrinsic_widths.preferred_width = geometry::max(min_width,
pref_width);
}
/// Recursively (top-down) determines the actual width of child contexts and boxes. When called
/// on this context, the context has had its width set by the parent context.
fn assign_widths(&mut self, ctx: &mut LayoutContext) {
debug!("assign_widths({}): assigning width for flow", "table_rowgroup");
// The position was set to the containing block by the flow's parent.
let containing_block_width = self.block_flow.base.position.size.width;
// FIXME: In case of border-collapse: collapse, left_content_edge should be border-left
let left_content_edge = Au::new(0);
let content_width = containing_block_width;
let width_computer = InternalTable;
width_computer.compute_used_width(&mut self.block_flow, ctx, containing_block_width);
self.block_flow.propagate_assigned_width_to_children(left_content_edge, content_width, Some(self.col_widths.clone()));
}
fn assign_height(&mut self, ctx: &mut LayoutContext) {
debug!("assign_height: assigning height for table_rowgroup");
self.assign_height_table_rowgroup_base(ctx);
}
fn compute_absolute_position(&mut self) {
self.block_flow.compute_absolute_position()
}
fn debug_str(&self) -> ~str {
let txt = "TableRowGroupFlow: ".to_owned();
txt.append(self.block_flow.box_.debug_str())
}
}