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Auto merge of #8306 - glennw:fix-abd-overflow, r=pcwalton

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Change overflow calculation to be calculated after compute_absolute_position.

Also include absolutely positioned elements in the overflow rect calculation.

Fixes #7797.

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This commit is contained in:
bors-servo 2015-11-04 08:15:58 +05:30
commit ca56ebbb09
10 changed files with 75 additions and 105 deletions
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47
components/layout/block.rs
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@ -42,7 +42,6 @@ use flow::{ImmutableFlowUtils, LateAbsolutePositionInfo, MutableFlowUtils, Opaqu
use flow::{LAYERS_NEEDED_FOR_DESCENDANTS, NEEDS_LAYER};
use flow::{PostorderFlowTraversal, PreorderFlowTraversal, mut_base};
use flow::{self, BaseFlow, EarlyAbsolutePositionInfo, Flow, FlowClass, ForceNonfloatedFlag};
use flow_ref;
use fragment::{CoordinateSystem, Fragment, FragmentBorderBoxIterator, HAS_LAYER};
use fragment::{SpecificFragmentInfo};
use gfx::display_list::{ClippingRegion, DisplayList};
@ -478,45 +477,6 @@ impl<'a> PreorderFlowTraversal for AbsoluteAssignBSizesTraversal<'a> {
}
}
/// The store-overflow traversal particular to absolute flows.
///
/// Propagate overflow up the Absolute flow tree and update overflow up to and
/// not including the root of the Absolute flow tree.
/// After that, it is up to the normal store-overflow traversal to propagate
/// it further up.
pub struct AbsoluteStoreOverflowTraversal<'a>{
pub layout_context: &'a LayoutContext<'a>,
}
impl<'a> PostorderFlowTraversal for AbsoluteStoreOverflowTraversal<'a> {
#[inline]
fn process(&self, flow: &mut Flow) {
{
// This will be taken care of by the normal store-overflow traversal.
let flow: &Flow = flow;
if flow.contains_roots_of_absolute_flow_tree() {
return;
}
}
flow.mutate_fragments(&mut |f: &mut Fragment| {
match f.specific {
SpecificFragmentInfo::InlineBlock(ref mut info) => {
let block = flow_ref::deref_mut(&mut info.flow_ref);
(block.as_mut_block() as &mut Flow).early_store_overflow(self.layout_context);
}
SpecificFragmentInfo::InlineAbsolute(ref mut info) => {
let block = flow_ref::deref_mut(&mut info.flow_ref);
(block.as_mut_block() as &mut Flow).early_store_overflow(self.layout_context);
}
_ => (),
}
});
flow.early_store_overflow(self.layout_context);
}
}
pub enum BlockType {
Replaced,
NonReplaced,
@ -1017,7 +977,6 @@ impl BlockFlow {
relative_containing_block_size: self.fragment.content_box().size,
relative_containing_block_mode: self.fragment.style().writing_mode,
};
kid.late_store_overflow(layout_context)
}
if self.base.flags.contains(IS_ABSOLUTELY_POSITIONED) {
@ -1074,11 +1033,6 @@ impl BlockFlow {
// the block-size of its containing block, which may also be an absolute flow.
(&mut *self as &mut Flow).traverse_preorder_absolute_flows(
&mut AbsoluteAssignBSizesTraversal(layout_context));
// Store overflow for all absolute descendants.
(&mut *self as &mut Flow).traverse_postorder_absolute_flows(
&mut AbsoluteStoreOverflowTraversal {
layout_context: layout_context,
});
}
// Don't remove the dirty bits yet if we're absolutely-positioned, since our final size
@ -1796,7 +1750,6 @@ impl Flow for BlockFlow {
self.base.thread_id = parent_thread_id;
if self.base.restyle_damage.intersects(REFLOW_OUT_OF_FLOW | REFLOW) {
self.assign_block_size(layout_context);
(self as &mut Flow).early_store_overflow(layout_context);
// Don't remove the restyle damage; `assign_block_size` decides whether that is
// appropriate (which in the case of e.g. absolutely-positioned flows, it is not).
}