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layout: Implement basic lists and the CSS1 list properties.

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The exact rendering is ill-spec'd. Some things are ugly (especially the
width and height of list style images) but they are infrequently used
and I believe this implementation matches the spec. Numeric lists are
not supported yet, since they will require a separate layout pass.

The implementation is a subclass of `BlockFlow`, on advice from Robert
O'Callahan.
This commit is contained in:
Patrick Walton 2014-12-09 12:12:50 -08:00
parent 7805fe19ed
commit 3029fbab92
14 changed files with 540 additions and 53 deletions
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14
components/layout/block.rs
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@ -30,7 +30,7 @@
use construct::FlowConstructor;
use context::LayoutContext;
use css::node_style::StyledNode;
use display_list_builder::{BlockFlowDisplayListBuilding, BlockLevel, FragmentDisplayListBuilding};
use display_list_builder::{BlockFlowDisplayListBuilding, FragmentDisplayListBuilding};
use floats::{ClearBoth, ClearLeft, ClearRight, FloatKind, FloatLeft, Floats, PlacementInfo};
use flow::{AbsolutePositionInfo, BaseFlow, BlockFlowClass, FloatIfNecessary, FlowClass, Flow};
use flow::{ForceNonfloated, ImmutableFlowUtils, MutableFlowUtils, PreorderFlowTraversal};
@ -51,6 +51,7 @@ use table::ColumnComputedInlineSize;
use wrapper::ThreadSafeLayoutNode;
use geom::Size2D;
use gfx::display_list::DisplayList;
use serialize::{Encoder, Encodable};
use servo_msg::compositor_msg::LayerId;
use servo_util::geometry::{Au, MAX_AU, MAX_RECT, ZERO_POINT};
@ -1853,16 +1854,7 @@ impl Flow for BlockFlow {
}
fn build_display_list(&mut self, layout_context: &LayoutContext) {
if self.base.flags.is_float() {
// TODO(#2009, pcwalton): This is a pseudo-stacking context. We need to merge `z-index:
// auto` kids into the parent stacking context, when that is supported.
self.build_display_list_for_floating_block(layout_context)
} else if self.base.flags.contains(IS_ABSOLUTELY_POSITIONED) {
self.build_display_list_for_absolutely_positioned_block(layout_context)
} else {
self.build_display_list_for_block(layout_context, BlockLevel)
}
self.build_display_list_for_block(box DisplayList::new(), layout_context);
if opts::get().validate_display_list_geometry {
self.base.validate_display_list_geometry();
}