Trait LayoutTreeVisitor

pub trait LayoutTreeVisitor<T: LayoutTreeNode> {
    // Required methods
    fn parent(&self) -> Option<&T>;
    fn for_each_child<'a, 'b: 'a, F>(&'b self, f: F)
       where F: FnMut(&'a T, usize),
             T: 'a;
    fn children_len(&self) -> usize;
    fn child_at(&self, index: usize) -> Option<&T>;

    // Provided method
    fn dirty_marked(&self) { ... }
}

A helper type for tree traversal.

Required Methods

fn parent(&self) -> Option<&T>

Get the parent node.

fn for_each_child<'a, 'b: 'a, F>(&'b self, f: F)

where F: FnMut(&'a T, usize), T: 'a,

Get child nodes.

fn children_len(&self) -> usize

Get the count of child nodes.

fn child_at(&self, index: usize) -> Option<&T>

Get the specified child.

Provided Methods

fn dirty_marked(&self)

A notifier that the node has been marked dirty.

When LayoutNode::mark_dirty is called, some related nodes (e.g. the ancestors) are also marked dirty automatically. These calls tells which nodes are marked dirty.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors