GridNavigator constructor

GridNavigator({
  1. required int itemCount,
  2. required int columns,
  3. int initialIndex = 0,
})

Creates a grid navigation with fixed column count.

itemCount is the total number of items. columns is the number of columns (must be >= 1). initialIndex is the starting focus (defaults to 0).

Implementation

GridNavigator({
  required int itemCount,
  required int columns,
  int initialIndex = 0,
})  : _itemCount = max(0, itemCount),
      _columns = max(1, columns),
      _focusedIndex = 0 {
  _focusedIndex = _itemCount > 0 ? initialIndex.clamp(0, _itemCount - 1) : 0;
}