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Add a generic inorder traversal method

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This commit is contained in:
Matt Brubeck 2017-08-07 12:40:21 -07:00
parent a624496cc4
commit 0d36930727
3 changed files with 19 additions and 16 deletions
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17
components/layout/flow.rs
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@ -542,6 +542,9 @@ pub trait MutableFlowUtils {
/// 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
@ -643,7 +646,7 @@ pub trait InorderFlowTraversal {
/// Returns true if this node should be processed and false if neither this node nor its
/// descendants should be processed.
fn should_process(&mut self, flow: &mut Flow) -> bool;
fn should_process_subtree(&mut self, flow: &mut Flow) -> bool;
}
bitflags! {
@ -1378,6 +1381,18 @@ impl<'a> MutableFlowUtils for &'a mut Flow {
}
}
/// 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.