nehan/dist/logical-text-justifier.js

Html layout engine for paged-media written in Typescript

import { Config, LogicalTextNode, LogicalInlineNode, } from './public-api';
export class LogicalTextJustifier {
    constructor() { }
    getJustifyTargetChars(children) {
        return children.reduce((chars, child) => {
            if (child instanceof LogicalTextNode) {
                return chars.concat(child.children);
            }
            if (child instanceof LogicalInlineNode) {
                return chars.concat(this.getJustifyTargetChars(child.children));
            }
            return chars;
        }, []).slice(0, -1);
    }
    justify(line) {
        const minJustifySpaceSize = line.env.font.size / 4;
        const maxJustifySpaceSize = line.env.font.size;
        const spaceSize = line.size.measure - line.autoSize.measure;
        if (spaceSize < minJustifySpaceSize || spaceSize > maxJustifySpaceSize) {
            return;
        }
        const targetChars = this.getJustifyTargetChars(line.children);
        if (targetChars.length <= 1) {
            return;
        }
        const charSpacingSize = spaceSize / targetChars.length;
        if (charSpacingSize >= Config.maxJustifyGap) {
            return;
        }
        targetChars.forEach(char => char.spacing = charSpacingSize);
    }
}
LogicalTextJustifier.instance = new LogicalTextJustifier();
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