Method getRatioForPortion

src/layout/msWorkspace/portion.ts:345–380

(
        portion: Portion,
        ratio: Rectangular = { x: 0, y: 0, width: 1, height: 1 }
    )

    }

    getRatioForPortion(
        portion: Portion,
        ratio: Rectangular = { x: 0, y: 0, width: 1, height: 1 }
    ): Rectangular {
        const basisTotal = this.children.reduce(
            (sum, child) => sum + child.basis,
            0
        );
        let basisSum = 0;

        for (let i = 0; i < this.children.length; i++) {
            const child = this.children[i];
            const hasPortion = child.hasPortion(portion);

            if (child !== portion && !hasPortion) {
                basisSum += child.basis;

                continue;
            }

            const [position, size] = this.vertical
                ? (['y', 'height'] as const)
                : (['x', 'width'] as const);

            ratio[position] += ratio[size] * (basisSum / basisTotal);
            ratio[size] *= child.basis / basisTotal;

            if (hasPortion) {
                return child.getRatioForPortion(portion, ratio);
            }

            break;
        }

        return ratio;
    }

    convert() {
        this.vertical = !this.vertical;