Struct TreeNode 

pub struct TreeNode {

    pub id: NodeId,
    pub view_id: ViewId,
    pub kind: ViewKind,
    pub modifier: Modifier,
    pub semantics: Option<Semantics>,
    pub children: SmallVec<[NodeId; 4]>,
    pub parent: Option<NodeId>,
    pub content_hash: u64,
    pub layout_hash: u64,
    pub measurement_hash: u64,
    pub paint_hash: u64,
    pub semantics_hash: u64,
    pub subtree_hash: u64,
    pub layout_subtree_hash: u64,
    pub measurement_subtree_hash: u64,
    pub paint_subtree_hash: u64,
    pub semantics_subtree_hash: u64,
    pub layout_cache: Option<LayoutCache>,
    pub generation: u64,
    pub user_key: Option<u64>,
    pub depth: u32,
    pub scope_key: Option<String>,
}

A node in the persistent view tree.

Fields

id: NodeId

Internal slotmap key.

view_id: ViewId

User-facing stable view ID (for hit testing, focus, etc.).

kind: ViewKind

The kind of view this node represents.

modifier: Modifier

Layout and styling modifiers.

semantics: Option<Semantics>

children: SmallVec<[NodeId; 4]>

Child node IDs.

parent: Option<NodeId>

Parent node ID (None for root).

content_hash: u64

Legacy aggregate hash of this node’s immediate content.

layout_hash: u64

Hash of values that can change layout.

measurement_hash: u64

Hash of values that can change text or intrinsic measurement.

paint_hash: u64

Hash of values that can change painting.

semantics_hash: u64

Hash of accessibility semantics.

subtree_hash: u64

Legacy aggregate hash including all descendants.

layout_subtree_hash: u64

measurement_subtree_hash: u64

paint_subtree_hash: u64

semantics_subtree_hash: u64

layout_cache: Option<LayoutCache>

Cached layout result.

generation: u64

Generation when this node was last updated.

user_key: Option<u64>

Key provided by user for stable identity in dynamic lists.

depth: u32

Depth in tree (root = 0).

scope_key: Option<String>

If this node is a scope boundary (set by scope! macro), this holds the scope key (e.g., “title”, “color_buttons”). None for non-scope nodes.

Implementations

impl TreeNode

pub fn new( id: NodeId, view_id: ViewId, kind: ViewKind, modifier: Modifier, generation: u64, ) -> Self

Create a new tree node.

pub fn has_valid_layout(&self) -> bool

Check if this node’s layout cache is still valid.

pub fn invalidate_layout(&mut self)

Invalidate layout cache (called when content changes).

pub fn cached_rect(&self) -> Option<Rect>

Get cached layout if available.

pub fn set_layout(&mut self, rect: Rect)

Trait Implementations

impl Clone for TreeNode

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.