walter-boente_book-collection/js/snapToBaseline.js

import { Handler } from '/csspageweaver/lib/paged.esm.js';

export default class snapToBaseline extends Handler {
    constructor(chunker, polisher, caller) {
        super(chunker, polisher, caller);
        this.baseline;
    }

    beforeParsed(content){
        this.baseline = parseFloat(getComputedStyle(document.documentElement).getPropertyValue('--baseline').trim());
        // console.log("========================================");
        // console.log("baseline = " + this.baseline);
    }

    renderNode(node, sourceNode){
        if (node.nodeName === 'P') {
            this.baseline = parseFloat(getComputedStyle(document.documentElement).getPropertyValue('--baseline').trim());
            const area = node.closest('.pagedjs_area');
            if (area) {
                const areaRect = area.getBoundingClientRect();
                const nodeRect = node.getBoundingClientRect();
                const relativeTop = nodeRect.top - areaRect.top;
                const modulo = relativeTop % this.baseline;
                if (modulo !== 0) {
                    let newPadding = this.baseline - modulo;
                    node.style.paddingTop = newPadding + 'px';
                }
            }
            return node;
        }
    }

  

    
  
}