nehan/dist/containing-element.js

Html layout engine for paged-media written in Typescript

import { CssCascade, Display, } from './public-api';
export class ContainingElement {
    static getAbsAncestor(element) {
        let parent = element.parent;
        while (parent) {
            const position = parent.computedStyle.getPropertyValue("position");
            if (position !== "static") {
                break;
            }
            parent = parent.parent;
        }
        return parent || element.ownerDocument.body;
    }
    static getBlockAncestor(element) {
        let parent = element.parent;
        while (parent) {
            const display = Display.load(parent);
            if (display.isBlockLevel() || display.isFlowRoot()) {
                return parent;
            }
            parent = parent.parent;
        }
        return element.ownerDocument.body;
    }
    static get(element) {
        const position = CssCascade.getValue(element, "position");
        if (element.tagName === "body") {
            return element;
        }
        if (!element.parent) {
            return element.ownerDocument.body;
        }
        if (position === "absolute" || position === "fixed") {
            return this.getAbsAncestor(element);
        }
        if (Display.load(element).isBlockLevel()) {
            return this.getBlockAncestor(element);
        }
        return element.parent;
    }
}
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