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layout: Centralize the logic that determines whether fragments get

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layers in the fragment, so that it can be activated when we're forcing
the creation of extra layers due to positioned descendants that
themselves have layers.

The newly failing tests were tests that accidentally passed due to
incorrect stacking order.

Closes #7281.
This commit is contained in:
Patrick Walton 2015-08-19 14:57:42 -07:00
parent d48f6ffbad
commit ec1c90df41
14 changed files with 167 additions and 67 deletions
Download patch file Download diff file Expand all files Collapse all files

89
components/layout/display_list_builder.rs
View file

@ -14,9 +14,9 @@ use azure::azure_hl::Color;
use block::BlockFlow;
use context::LayoutContext;
use flex::FlexFlow;
use flow::{self, BaseFlow, Flow, IS_ABSOLUTELY_POSITIONED, NEEDS_LAYER};
use flow::{self, BaseFlow, Flow, IS_ABSOLUTELY_POSITIONED};
use flow_ref;
use fragment::{CoordinateSystem, Fragment, IframeFragmentInfo, ImageFragmentInfo};
use fragment::{CoordinateSystem, Fragment, HAS_LAYER, IframeFragmentInfo, ImageFragmentInfo};
use fragment::{ScannedTextFragmentInfo, SpecificFragmentInfo};
use inline::InlineFlow;
use list_item::ListItemFlow;
@ -1513,7 +1513,6 @@ pub trait BlockFlowDisplayListBuilding {
display_list: Box<DisplayList>,
layout_context: &LayoutContext,
border_painting_mode: BorderPaintingMode);
fn will_get_layer(&self) -> bool;
}
impl BlockFlowDisplayListBuilding for BlockFlow {
@ -1557,35 +1556,32 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
border_painting_mode,
background_border_level);
self.base.display_list_building_result = if self.fragment.establishes_stacking_context() {
if self.will_get_layer() {
// If we got here, then we need a new layer.
let scroll_policy = if self.is_fixed() {
ScrollPolicy::FixedPosition
} else {
ScrollPolicy::Scrollable
};
self.base.display_list_building_result = if self.fragment.flags.contains(HAS_LAYER) {
let scroll_policy = if self.is_fixed() {
ScrollPolicy::FixedPosition
} else {
ScrollPolicy::Scrollable
};
let paint_layer = PaintLayer::new(self.layer_id(0),
color::transparent(),
scroll_policy);
let layer = StackingContextLayer::Existing(paint_layer);
let stacking_context = self.fragment.create_stacking_context(
let paint_layer = PaintLayer::new(self.layer_id(0),
color::transparent(),
scroll_policy);
let layer = StackingContextLayer::Existing(paint_layer);
let stacking_context = self.fragment.create_stacking_context(
&self.base,
display_list,
layout_context,
layer,
StackingContextCreationMode::Normal);
DisplayListBuildingResult::StackingContext(stacking_context)
} else if self.fragment.establishes_stacking_context() {
DisplayListBuildingResult::StackingContext(
self.fragment.create_stacking_context(
&self.base,
display_list,
layout_context,
layer,
StackingContextCreationMode::Normal);
DisplayListBuildingResult::StackingContext(stacking_context)
} else {
DisplayListBuildingResult::StackingContext(
self.fragment.create_stacking_context(
&self.base,
display_list,
layout_context,
StackingContextLayer::IfCanvas(self.layer_id(0)),
StackingContextCreationMode::Normal))
}
StackingContextLayer::IfCanvas(self.layer_id(0)),
StackingContextCreationMode::Normal))
} else {
match self.fragment.style.get_box().position {
position::T::static_ => {}
@ -1597,11 +1593,6 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
}
}
fn will_get_layer(&self) -> bool {
self.base.absolute_position_info.layers_needed_for_positioned_flows ||
self.base.flags.contains(NEEDS_LAYER)
}
fn build_display_list_for_absolutely_positioned_block(
&mut self,
mut display_list: Box<DisplayList>,
@ -1654,23 +1645,21 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
}
};
if !self.fragment.establishes_stacking_context() {
display_list.form_pseudo_stacking_context_for_positioned_content();
self.base.display_list_building_result =
DisplayListBuildingResult::Normal(display_list);
return
}
if !self.will_get_layer() {
// We didn't need a layer.
self.base.display_list_building_result =
DisplayListBuildingResult::StackingContext(
self.fragment.create_stacking_context(
&self.base,
display_list,
layout_context,
StackingContextLayer::IfCanvas(self.layer_id(0)),
StackingContextCreationMode::Normal));
if !self.fragment.flags.contains(HAS_LAYER) {
if !self.fragment.establishes_stacking_context() {
display_list.form_pseudo_stacking_context_for_positioned_content();
self.base.display_list_building_result =
DisplayListBuildingResult::Normal(display_list);
} else {
self.base.display_list_building_result =
DisplayListBuildingResult::StackingContext(
self.fragment.create_stacking_context(
&self.base,
display_list,
layout_context,
StackingContextLayer::IfCanvas(self.layer_id(0)),
StackingContextCreationMode::Normal));
}
return
}