SliverChildBuilderDelegate _buildSliverChildBuilderDelegate()

in cupertino_store/step_06/lib/shopping_cart_tab.dart [158:229]
72 lines of code
8 McCabe index (conditional complexity)

  SliverChildBuilderDelegate _buildSliverChildBuilderDelegate(
      AppStateModel model) {
    return SliverChildBuilderDelegate(
      (context, index) {
        final productIndex = index - 4;
        switch (index) {
          case 0:
            return Padding(
              padding: const EdgeInsets.symmetric(horizontal: 16),
              child: _buildNameField(),
            );
          case 1:
            return Padding(
              padding: const EdgeInsets.symmetric(horizontal: 16),
              child: _buildEmailField(),
            );
          case 2:
            return Padding(
              padding: const EdgeInsets.symmetric(horizontal: 16),
              child: _buildLocationField(),
            );
          case 3:
            return Padding(
              padding: const EdgeInsets.fromLTRB(16, 8, 16, 24),
              child: _buildDateAndTimePicker(context),
            );
          default:
            if (model.productsInCart.length > productIndex) {
              return ShoppingCartItem(
                index: index,
                product: model.getProductById(
                    model.productsInCart.keys.toList()[productIndex]),
                quantity: model.productsInCart.values.toList()[productIndex],
                lastItem: productIndex == model.productsInCart.length - 1,
                formatter: _currencyFormat,
              );
            } else if (model.productsInCart.keys.length == productIndex &&
                model.productsInCart.isNotEmpty) {
              return Padding(
                padding: const EdgeInsets.symmetric(horizontal: 20),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.end,
                  children: <Widget>[
                    Column(
                      crossAxisAlignment: CrossAxisAlignment.end,
                      children: <Widget>[
                        Text(
                          'Shipping '
                          '${_currencyFormat.format(model.shippingCost)}',
                          style: Styles.productRowItemPrice,
                        ),
                        const SizedBox(height: 6),
                        Text(
                          'Tax ${_currencyFormat.format(model.tax)}',
                          style: Styles.productRowItemPrice,
                        ),
                        const SizedBox(height: 6),
                        Text(
                          'Total ${_currencyFormat.format(model.totalCost)}',
                          style: Styles.productRowTotal,
                        ),
                      ],
                    )
                  ],
                ),
              );
            }
        }
        return null;
      },
    );
  }