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Widget _buildCategoryWidgets(bool portrait){
  if (portrait) {
    return ListView.builder(
      itemBuilder: (BuildContext context, int index) => _categories[index],
      itemCount: _categories.length,
    );
  } else {
    return GridView.count(
      crossAxisCount: 2,
      childAspectRatio: 3.0,
      children: _categories,
    );
  }
}