Struct HTMLCanvas 

pub struct HTMLCanvas { /* private fields */ }

Per-frame DOM builder: creates/updates cotis-{id} elements and manages clip stacks.

One instance should be created per frame via HTMLCanvas::new and consumed with HTMLCanvas::finish. Commands that share a render id reuse the same host element.

Implementations

impl HTMLCanvas

pub fn new() -> Self

Starts a new rendering frame (calls JS beginFrame).

WASM

Requires an initialized HTML root (init_html_root in renderer.js).

pub fn ensure_command_element( &mut self, command_id: u32, html_type: &str, extra_style: Option<&str>, )

Opens or reuses the host element for a render command. Multiple drawables that share the same command_id accumulate current_element_css_push on one DOM node (cotis-{id}).

pub fn current_element_css_push(&mut self, value: &str) -> &mut Self

Add CSS properties to the current element. Properties are parsed from CSS syntax. If a property already exists, it will be overwritten. Example: “background-color: red; padding: 10px”

pub fn set_text_content(&mut self, text: String)

Set the text content of the current element (internal use)

pub fn set_inner_html(&mut self, html: String)

Set innerHTML for the current element (e.g. custom HTML hosts)

pub fn new_element(&mut self, prefix: &str, html_type: &str) -> &mut Self

Create a new child element. This finalizes the current element and starts building a new one.

Arguments

• prefix - A prefix for the element ID (for debugging/identification)
• html_type - The HTML tag name (e.g., “div”, “button”, “span”)

pub fn finish(self)

Commits the frame and removes DOM nodes not referenced in used_element_ids.

Consumes self. Must be called once per frame after all drawables have run.

Trait Implementations

impl Default for HTMLCanvas

fn default() -> Self

Returns the “default value” for a type.