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layout: Draw elements with position: relative; z-index: auto over

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ordinary content per CSS 2.1 Appendix E.

Improves Talking Points Memo.
This commit is contained in:
Patrick Walton 2015-05-11 16:29:24 -07:00
parent 234fb68a16
commit 87a620e1b3
7 changed files with 117 additions and 17 deletions
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38
components/layout/display_list_builder.rs
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@ -1364,8 +1364,15 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
background_border_level);
self.base.display_list_building_result = if self.fragment.establishes_stacking_context() {
DisplayListBuildingResult::StackingContext(self.fragment.create_stacking_context(&self.base, display_list, None))
DisplayListBuildingResult::StackingContext(
self.fragment.create_stacking_context(&self.base, display_list, None))
} else {
match self.fragment.style.get_box().position {
position::T::static_ => {}
_ => {
display_list.form_pseudo_stacking_context_for_positioned_content();
}
}
DisplayListBuildingResult::Normal(display_list)
}
}
@ -1384,8 +1391,8 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
!self.base.flags.contains(NEEDS_LAYER) {
// We didn't need a layer.
self.base.display_list_building_result =
DisplayListBuildingResult::StackingContext(self.fragment
.create_stacking_context(&self.base, display_list, None));
DisplayListBuildingResult::StackingContext(
self.fragment.create_stacking_context(&self.base, display_list, None));
return
}
@ -1398,10 +1405,10 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
let transparent = color::transparent();
let stacking_context = self.fragment.create_stacking_context(&self.base, display_list,
Some(Arc::new(PaintLayer::new(self.layer_id(0),
transparent,
scroll_policy))));
let stacking_context = self.fragment.create_stacking_context(
&self.base,
display_list,
Some(Arc::new(PaintLayer::new(self.layer_id(0), transparent, scroll_policy))));
self.base.display_list_building_result =
DisplayListBuildingResult::StackingContext(stacking_context)
}
@ -1417,8 +1424,8 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
display_list.form_float_pseudo_stacking_context();
self.base.display_list_building_result = if self.fragment.establishes_stacking_context() {
DisplayListBuildingResult::StackingContext(self.fragment
.create_stacking_context(&self.base, display_list, None))
DisplayListBuildingResult::StackingContext(
self.fragment.create_stacking_context(&self.base, display_list, None))
} else {
DisplayListBuildingResult::Normal(display_list)
}
@ -1496,11 +1503,16 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
// FIXME(Savago): fix Fragment::establishes_stacking_context() for absolute positioned item
// and remove the check for filter presence. Further details on #5812.
if has_stacking_context && !self.fragments.fragments[0].style().get_effects().filter.is_empty() {
if has_stacking_context &&
!self.fragments.fragments[0].style().get_effects().filter.is_empty() {
self.base.display_list_building_result =
DisplayListBuildingResult::StackingContext(self.fragments.fragments[0].create_stacking_context(&self.base, display_list, None));
DisplayListBuildingResult::StackingContext(
self.fragments.fragments[0].create_stacking_context(&self.base,
display_list,
None));
} else {
self.base.display_list_building_result = DisplayListBuildingResult::Normal(display_list);
self.base.display_list_building_result =
DisplayListBuildingResult::Normal(display_list);
}
if opts::get().validate_display_list_geometry {
@ -1614,7 +1626,7 @@ pub enum StackingLevel {
BackgroundAndBorders,
/// Borders and backgrounds for block-level descendants: step 4.
BlockBackgroundsAndBorders,
/// All other content.
/// All non-positioned content.
Content,
}