@teaui/core/.dist/components/Geometry.js

A high-level terminal UI library for Node

import { Container } from '../Container.js';
import { Size } from '../geometry.js';
/**
 * A container that reports its available size via onLayout callback. Defaults to
 * filling all available space (width='fill', height='fill') unless explicit
 * dimensions are provided.
 *
 * Useful for:
 * - Measuring available space before deciding what to render
 * - Virtualized lists that need viewport height to calculate visible items
 * - Responsive layouts that change based on available space
 */
export class Geometry extends Container {
    #onLayout;
    #prevSize = Size.zero;
    constructor({ onLayout, ...props }) {
        super(props);
        this.#onLayout = onLayout;
    }
    update({ onLayout, ...props }) {
        this.#onLayout = onLayout;
        super.update(props);
    }
    naturalSize(available) {
        return available;
    }
    render(viewport) {
        if (viewport.isEmpty) {
            return super.render(viewport);
        }
        const size = viewport.contentSize;
        if (size.width !== this.#prevSize.width ||
            size.height !== this.#prevSize.height) {
            this.#prevSize = size;
            this.#onLayout?.(size);
        }
        super.render(viewport);
    }
}
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