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Code organization: Move all generic traversal code to layout::traversal

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Matt Brubeck 2017-08-07 16:59:05 -07:00
parent a08bc13df9
commit d1a37f1ea3
8 changed files with 107 additions and 139 deletions
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109
components/layout/flow.rs
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@ -535,28 +535,6 @@ pub trait ImmutableFlowUtils {
}
pub trait MutableFlowUtils {
// Traversals
/// Traverses the tree in preorder.
fn traverse_preorder<T: PreorderFlowTraversal>(self, traversal: &T);
/// Traverses the tree in postorder.
fn traverse_postorder<T: PostorderFlowTraversal>(self, traversal: &T);
/// Traverses the tree in-order.
fn traverse_inorder<T: InorderFlowTraversal>(self, traversal: &mut T, level: u32);
/// Traverse the Absolute flow tree in preorder.
///
/// Traverse all your direct absolute descendants, who will then traverse
/// their direct absolute descendants.
///
/// Return true if the traversal is to continue or false to stop.
fn traverse_preorder_absolute_flows<T>(&mut self, traversal: &mut T)
where T: PreorderFlowTraversal;
// Mutators
/// Calls `repair_style` and `bubble_inline_sizes`. You should use this method instead of
/// calling them individually, since there is no reason not to perform both operations.
fn repair_style_and_bubble_inline_sizes(self, style: &::ServoArc<ComputedValues>);
@ -608,42 +586,6 @@ impl FlowClass {
}
}
/// A top-down traversal.
pub trait PreorderFlowTraversal {
/// The operation to perform. Return true to continue or false to stop.
fn process(&self, flow: &mut Flow);
/// Returns true if this node must be processed in-order. If this returns false,
/// we skip the operation for this node, but continue processing the descendants.
/// This is called *after* parent nodes are visited.
fn should_process(&self, _flow: &mut Flow) -> bool {
true
}
}
/// A bottom-up traversal, with a optional in-order pass.
pub trait PostorderFlowTraversal {
/// The operation to perform. Return true to continue or false to stop.
fn process(&self, flow: &mut Flow);
/// Returns false if this node must be processed in-order. If this returns false, we skip the
/// operation for this node, but continue processing the ancestors. This is called *after*
/// child nodes are visited.
fn should_process(&self, _flow: &mut Flow) -> bool {
true
}
}
/// An in-order (sequential only) traversal.
pub trait InorderFlowTraversal {
/// The operation to perform. Returns the level of the tree we're at.
fn process(&mut self, flow: &mut Flow, level: u32);
/// Returns true if this node should be processed and false if neither this node nor its
/// descendants should be processed.
fn should_process_subtree(&mut self, flow: &mut Flow) -> bool;
}
bitflags! {
#[doc = "Flags used in flows."]
pub flags FlowFlags: u32 {
@ -1354,41 +1296,6 @@ impl<'a> ImmutableFlowUtils for &'a Flow {
}
impl<'a> MutableFlowUtils for &'a mut Flow {
/// Traverses the tree in preorder.
fn traverse_preorder<T: PreorderFlowTraversal>(self, traversal: &T) {
if traversal.should_process(self) {
traversal.process(self);
}
for kid in child_iter_mut(self) {
kid.traverse_preorder(traversal);
}
}
/// Traverses the tree in postorder.
fn traverse_postorder<T: PostorderFlowTraversal>(self, traversal: &T) {
for kid in child_iter_mut(self) {
kid.traverse_postorder(traversal);
}
if traversal.should_process(self) {
traversal.process(self)
}
}
/// Traverses the tree in-order.
fn traverse_inorder<T: InorderFlowTraversal>(self, traversal: &mut T, level: u32) {
if !traversal.should_process_subtree(self) {
return;
}
traversal.process(self, level);
for kid in child_iter_mut(self) {
kid.traverse_inorder(traversal, level + 1);
}
}
/// Calls `repair_style` and `bubble_inline_sizes`. You should use this method instead of
/// calling them individually, since there is no reason not to perform both operations.
fn repair_style_and_bubble_inline_sizes(self, style: &::ServoArc<ComputedValues>) {
@ -1396,22 +1303,6 @@ impl<'a> MutableFlowUtils for &'a mut Flow {
mut_base(self).update_flags_if_needed(style);
self.bubble_inline_sizes();
}
/// Traverse the Absolute flow tree in preorder.
///
/// Traverse all your direct absolute descendants, who will then traverse
/// their direct absolute descendants.
///
/// Return true if the traversal is to continue or false to stop.
fn traverse_preorder_absolute_flows<T>(&mut self, traversal: &mut T)
where T: PreorderFlowTraversal {
traversal.process(*self);
let descendant_offset_iter = mut_base(*self).abs_descendants.iter();
for ref mut descendant_link in descendant_offset_iter {
descendant_link.traverse_preorder_absolute_flows(traversal)
}
}
}
impl MutableOwnedFlowUtils for FlowRef {