Example code for article about TagCloudView - Creation of Rows

SetupRows.swift

private func setupRows() {

    // 1: Loop over items.
    for item in itemViews {
        guard let currentRow = rows.last else { return }

        // 2: Check whether to extend current row or start a new row.
        let currentRowWidth = currentRow.arrangedSubviews
            .map(\.frame.width)
            .reduce(0, +)
        
        // 3: Extend current row.
        if frame.width > currentRowWidth + item.expectedWidth {
            currentRow.addArrangedSubview(item)
        } else {

            // 4: Add empty view to align previous row to the left.
            let fillerView = NSView()
            currentRow.addArrangedSubview(fillerView)

            // 5: Start next row.
            let newRowStackView = emptyRowStackView
            newRowStackView.addArrangedSubview(item)
            rows.append(newRowStackView)
        }
    }

    // 6: Add empty view to align last row to the left.
    let fillerView = NSView()
    rows.last?.addArrangedSubview(fillerView)
}