Embeds a flat list into a 2-level block structure. Useful for responsive UIs when you need to switch between three layout variants.

NestedBlockLayout.cs

void TwoLevelsFullyDefined() {
    const int itemsCount = 12;

    const int level1BlocksInList = 2;
    const int itemsInLevel1Block = 6;

    const int level2BlocksInLevel1Block = 2;
    const int itemsInLevel2Block = 3;

    Console.WriteLine("<list>");
    for(int currentLevel1Block = 0; currentLevel1Block < level1BlocksInList; currentLevel1Block++) {
        Console.WriteLine($"    <level1-block{currentLevel1Block}>");

        int firstLevel2Block = currentLevel1Block * level2BlocksInLevel1Block;
        int lastLevel2Block = (currentLevel1Block + 1) * level2BlocksInLevel1Block - 1;
        int lastItemInLevel1Block = Math.Min((currentLevel1Block + 1) * itemsInLevel1Block - 1, itemsCount);
        for(int currentLevel2Block = firstLevel2Block; currentLevel2Block <= lastLevel2Block; currentLevel2Block++) {
            Console.WriteLine($"        <level2-block{currentLevel2Block}>");

            int firstItemInLevel2Block = currentLevel2Block * itemsInLevel2Block;
            int lastItemInLevel2Block = Math.Min((currentLevel2Block + 1) * itemsInLevel2Block - 1, lastItemInLevel1Block);
            for(int i = firstItemInLevel2Block; i <= lastItemInLevel2Block; i++) {
                Console.WriteLine($"            <item-{i}>");
            }
            Console.WriteLine($"        </level2-block{currentLevel2Block}>");
        }
        Console.WriteLine($"    </level1-block{currentLevel1Block}>");
    }
    Console.WriteLine($"</list>");
}