moveUp method

bool moveUp(
  1. TKey key
)

Moves key one position earlier among its live siblings.

One of the four moves exposed to assistive technology, where pointer drags are unusable. Each returns whether it committed, applies canAcceptDrop, and reports through onReorder, exactly as moveTo does.

Implementation

bool moveUp(TKey key) {
  return _moveBySiblingDelta(key, -1);
}