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layout: Make absolute position calculation idempotent.

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This will be necessary for incremental reflow of absolutely-positioned
flows.
This commit is contained in:
Patrick Walton 2014-10-30 13:11:50 -07:00
parent 20b2fae238
commit 265763518f
1 changed files with 34 additions and 9 deletions
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43
components/layout/block.rs
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@ -529,6 +529,9 @@ pub struct BlockFlow {
/// used to speculatively lay out block formatting contexts.
inline_size_of_preceding_right_floats: Au,
/// The hypothetical position, used for absolutely-positioned flows.
hypothetical_position: LogicalPoint<Au>,
/// Additional floating flow members.
pub float: Option<Box<FloatedBlockInfo>>,
@ -558,6 +561,7 @@ impl BlockFlow {
static_b_offset: Au::new(0),
inline_size_of_preceding_left_floats: Au(0),
inline_size_of_preceding_right_floats: Au(0),
hypothetical_position: LogicalPoint::new(writing_mode, Au(0), Au(0)),
float: None,
flags: BlockFlowFlags::empty(),
}
@ -571,6 +575,7 @@ impl BlockFlow {
static_b_offset: Au::new(0),
inline_size_of_preceding_left_floats: Au(0),
inline_size_of_preceding_right_floats: Au(0),
hypothetical_position: LogicalPoint::new(writing_mode, Au(0), Au(0)),
float: None,
flags: BlockFlowFlags::empty(),
}
@ -587,6 +592,7 @@ impl BlockFlow {
static_b_offset: Au::new(0),
inline_size_of_preceding_left_floats: Au(0),
inline_size_of_preceding_right_floats: Au(0),
hypothetical_position: LogicalPoint::new(writing_mode, Au(0), Au(0)),
float: Some(box FloatedBlockInfo::new(float_kind)),
flags: BlockFlowFlags::empty(),
}
@ -603,6 +609,7 @@ impl BlockFlow {
static_b_offset: Au::new(0),
inline_size_of_preceding_left_floats: Au(0),
inline_size_of_preceding_right_floats: Au(0),
hypothetical_position: LogicalPoint::new(writing_mode, Au(0), Au(0)),
float: Some(box FloatedBlockInfo::new(float_kind)),
flags: BlockFlowFlags::empty(),
}
@ -842,9 +849,9 @@ impl BlockFlow {
let mut layers_needed_for_descendants = false;
for kid in self.base.child_iter() {
if flow::base(kid).flags.is_absolutely_positioned() {
// Assume that the *hypothetical box* for an absolute flow starts immediately after
// the block-end border edge of the previous flow.
flow::mut_base(kid).position.start.b = cur_b;
// Assume that the *hypothetical box* for an absolute flow starts immediately
// after the block-end border edge of the previous flow.
kid.as_block().hypothetical_position.b = cur_b;
kid.assign_block_size_for_inorder_child_if_necessary(layout_context);
propagate_layer_flag_from_child(&mut layers_needed_for_descendants, kid);
@ -974,6 +981,8 @@ impl BlockFlow {
// Store the content block-size for use in calculating the absolute flow's dimensions
// later.
//
// FIXME(pcwalton): This looks not idempotent. Is it?
self.fragment.border_box.size.block = block_size;
return
}
@ -1008,7 +1017,10 @@ impl BlockFlow {
// position.
self.fragment.border_box.size.block = cur_b;
self.fragment.border_box.start.b = Au(0);
self.base.position.size.block = cur_b;
if !self.base.flags.is_absolutely_positioned() {
self.base.position.size.block = cur_b;
}
// Store the current set of floats in the flow so that flows that come later in the
// document can access them.
@ -1068,7 +1080,10 @@ impl BlockFlow {
Au(0),
self.fragment.margin.block_start);
self.base.position = self.base.position.translate(&float_offset).translate(&margin_offset);
if !self.base.flags.is_absolutely_positioned() {
self.base.position = self.base.position.translate(&float_offset)
.translate(&margin_offset);
}
}
@ -1189,7 +1204,7 @@ impl BlockFlow {
/// roughly set to its static position (the position it would have had in
/// the normal flow).
pub fn get_hypothetical_block_start_edge(&self) -> Au {
self.base.position.start.b
self.hypothetical_position.b
}
/// Assigns the computed inline-start content edge and inline-size to all the children of this
@ -1270,8 +1285,16 @@ impl BlockFlow {
// The inline-start margin edge of the child flow is at our inline-start content edge,
// and its inline-size is our content inline-size.
flow::mut_base(kid).position.start.i = inline_start_content_edge;
flow::mut_base(kid).block_container_inline_size = content_inline_size;
{
let kid_base = flow::mut_base(kid);
if !kid_base.flags.is_absolutely_positioned() {
kid_base.position.start.i = inline_start_content_edge
}
kid_base.block_container_inline_size = content_inline_size;
}
if kid.is_block_like() {
kid.as_block().hypothetical_position.i = inline_start_content_edge
}
// Determine float impaction.
if flow::base(kid).flags.clears_left() {
@ -1583,7 +1606,9 @@ impl Flow for BlockFlow {
let containing_block_block_size =
self.base.block_container_explicit_block_size.unwrap_or(Au(0));
self.fragment.assign_replaced_block_size_if_necessary(containing_block_block_size);
self.base.position.size.block = self.fragment.border_box.size.block;
if !self.base.flags.is_absolutely_positioned() {
self.base.position.size.block = self.fragment.border_box.size.block;
}
} else if self.is_root() || self.is_float() || self.is_inline_block() {
// Root element margins should never be collapsed according to CSS § 8.3.1.
debug!("assign_block_size: assigning block_size for root flow");