How to calculate the sizes of nested interface elements, considering their parent component's width and conditions where values >= 0 set a fixed width, and values < 0 denote a fraction of the remaining width?

To calculate the width of nested interface elements considering the parent component's width and rules:

• Values >= 0 are fixed widths in pixels (or other units).
• Values < 0 are proportions of the remaining width (after subtracting all fixed widths).

Algorithm:

1. Sum all fixed widths (values >= 0).

2. Subtract this sum from the parent's width to get the remaining width.

3. Sum the absolute values of all negative numbers (proportions).

4. For each element with a negative value, calculate its width as:

   width = (abs(value) / sum_of_proportions) * remaining_width
   

Example:

Parent width: 1000px Elements: [200, -1, -2]

• Fixed width: 200px
• Remaining width: 1000 - 200 = 800px
• Sum of proportions: 1 + 2 = 3

Widths of elements:

• First: 200px
• Second: (1/3) * 800 ≈ 266.67px
• Third: (2/3) * 800 ≈ 533.33px

Thus, elements with negative values receive widths proportional to their share of the remaining space.