Struct VirtualTreeMetadata 

pub struct VirtualTreeMetadata {
    pub depth: usize,
    pub parent_key: Option<SharedString>,
    pub has_children: bool,
}

Cheap tree structure for one preorder item in a virtual table.

The row factory still runs only for items the viewport builds. This metadata is projected for the whole collection so expansion can derive the visible indices without eagerly constructing any cells.

Fields

depth: usize

Nesting depth of the item; zero for a root.

parent_key: Option<SharedString>

Key of the item’s parent, or None for a root.

has_children: bool

Whether the item has children.

Trait Implementations

impl Clone for VirtualTreeMetadata

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for VirtualTreeMetadata

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for VirtualTreeMetadata

fn default() -> Self

Returns the “default value” for a type.

impl Eq for VirtualTreeMetadata

impl PartialEq for VirtualTreeMetadata

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for VirtualTreeMetadata