Function layout

virtTiling.js:251–292

(columns, workArea, prefs, options = {})

   Mutates columns
 */
export function layout(columns, workArea, prefs, options = {}) {
    let gap = prefs.window_gap;
    let availableHeight = workArea.height;

    let { inGrab, selectedWindow } = options;
    let selectedIndex = -1;

    if (selectedWindow) {
        selectedIndex = columns.findIndex(col => col.includes(selectedWindow));
    }

    let y0 = workArea.y;
    let x = 0;

    for (let i = 0; i < columns.length; i++) {
        let column = columns[i];

        let selectedInColumn = i === selectedIndex ? selectedWindow : null;

        let targetWidth;
        if (i === selectedIndex) {
            targetWidth = selectedInColumn.width;
        } else {
            targetWidth = Math.max(...column.map(w => w.width));
        }
        targetWidth = Math.min(targetWidth, workArea.width - 2 * prefs.minimum_margin);

        if (inGrab && i === selectedIndex) {
            layoutGrabColumn(column, x, y0, targetWidth, availableHeight, selectedInColumn);
        } else {
            let allocator = options.customAllocators && options.customAllocators[i];
            allocator = allocator || allocateDefault;

            let targetHeights = allocator(column, availableHeight, selectedInColumn);
            layoutColumnSimple(column, x, y0, targetWidth, targetHeights);
        }

        x += targetWidth + gap;
    }

    return columns;
}