Struct ViewConstraints 

pub struct ViewConstraints { /* private fields */ }

Owns one parsed sheet and cached identities without per-request parsing.

All fit, centering, clamping, and zoom-limit arithmetic lives in the sheet. Errors leave the model available for subsequent updates, but do not promise rollback of writes already propagated.

Examples

let model = adam_web_ui::graph::ViewConstraints::new();
assert!(model.is_ok());

Implementations

impl ViewConstraints

pub fn new() -> Result<Self>

Parses and propagates the embedded sheet using the configured library host.

Errors

Returns a formatted diagnostic for invalid sheet syntax, missing cells, evaluation failure, or incomplete/non-finite initial outputs.

• Complexity: O(s² + n + p) time and O(s + n + p) space for installed signatures s, source length n, and the sheet’s propagation work p.

Examples

let mut model = adam_web_ui::graph::ViewConstraints::new()?;

pub fn update(&mut self, input: ViewInput) -> Result<ViewOutput>

Validates inputs, writes geometry and requested sources, and propagates.

Refresh preserves the original pan/zoom aspiration; Fit copies only the sheet’s derived fit into those sources and propagates a second time.

Errors

Returns an error for non-finite/unordered/unrepresentable bounds, nonpositive/non-finite viewport or proposed zoom, non-finite proposed pan, sheet evaluation failure, or incomplete/non-finite/nonpositive outputs. A failed update never returns a fallback view.

• Complexity: O(p) time and space in sheet propagation work; no parsing.

Examples

let mut model = ViewConstraints::new()?;
let output = model.update(ViewInput {
    bounds: Rect::default(),
    viewport: Size2D::new(400.0, 300.0),
    action: ViewAction::Fit,
})?;
assert_eq!(output.view.k, 300.0);