Struct RetainedTree 

pub struct RetainedTree {
    pub taffy: TaffyTree<()>,
    pub root: Option<RetainedNode>,
    pub layout_dirty: bool,
}

Mutable UI tree synchronized with Taffy layout nodes and Vello paint data.

Built from an Element via mount, then updated with patches from Runtime::take_patches. run manages this internally; use it directly in integration tests or custom hosts.

Fields

taffy: TaffyTree<()>

Shared Taffy tree backing flex layout for this UI.

root: Option<RetainedNode>

Root retained node, if mount succeeded.

layout_dirty: bool

When true, layout_pass should run before painting.

Implementations

impl RetainedTree

pub fn text_needs_reflow(&self) -> bool

Returns true if any text node still needs a layout pass (e.g. after UpdateText).

pub fn new() -> Self

Empty tree with no root node.

pub fn mount(element: Element) -> Result<Self, RetainedError>

Builds the initial retained tree from a frozen element tree (e.g. Runtime::root_element).

pub fn apply_patches( &mut self, patches: impl IntoIterator<Item = Patch>, ) -> Result<(), RetainedError>

Applies a batch of diff patches and marks layout dirty.

pub fn apply_patch(&mut self, patch: Patch) -> Result<(), RetainedError>

Trait Implementations

impl Debug for RetainedTree

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

Formats the value using the given formatter.

impl Default for RetainedTree

fn default() -> Self

Returns the “default value” for a type.