Widget _buildCart()

in lib/studies/shrine/expanding_bottom_sheet.dart [456:528]
65 lines of code
7 McCabe index (conditional complexity)

  Widget _buildCart(BuildContext context) {
    // numProducts is the number of different products in the cart (does not
    // include multiples of the same product).
    final isDesktop = isDisplayDesktop(context);

    final model = ScopedModel.of<AppStateModel>(context);
    final numProducts = model.productsInCart.keys.length;
    final totalCartQuantity = model.totalCartQuantity;
    final screenSize = MediaQuery.of(context).size;
    final screenWidth = screenSize.width;
    final screenHeight = screenSize.height;

    final expandedCartWidth = isDesktop
        ? (360 * cappedTextScale(context)).clamp(360, screenWidth).toDouble()
        : screenWidth;

    _width = isDesktop
        ? _desktopWidthFor(context)
        : _mobileWidthFor(numProducts, context);
    _widthAnimation = _getWidthAnimation(expandedCartWidth);
    _height = isDesktop
        ? _desktopHeightFor(numProducts, context)
        : _mobileHeightFor(context) + _bottomSafeArea;
    _heightAnimation = _getHeightAnimation(screenHeight);
    _topStartShapeAnimation = _getShapeTopStartAnimation(context);
    _bottomStartShapeAnimation = _getShapeBottomStartAnimation(context);
    _thumbnailOpacityAnimation = _getThumbnailOpacityAnimation();
    _cartOpacityAnimation = _getCartOpacityAnimation();
    _gapAnimation = isDesktop
        ? _getDesktopGapAnimation(116)
        : const AlwaysStoppedAnimation(0);

    final Widget child = SizedBox(
      width: _widthAnimation.value,
      height: _heightAnimation.value,
      child: Material(
        animationDuration: const Duration(milliseconds: 0),
        shape: BeveledRectangleBorder(
          borderRadius: BorderRadiusDirectional.only(
            topStart: Radius.circular(_topStartShapeAnimation.value),
            bottomStart: Radius.circular(_bottomStartShapeAnimation.value),
          ),
        ),
        elevation: 4,
        color: shrinePink50,
        child: _cartIsVisible
            ? _buildShoppingCartPage()
            : _buildThumbnails(context, numProducts),
      ),
    );

    final childWithInteraction = productPageIsVisible(context)
        ? Semantics(
            button: true,
            enabled: true,
            label: GalleryLocalizations.of(context)
                .shrineScreenReaderCart(totalCartQuantity),
            child: MouseRegion(
              cursor: SystemMouseCursors.click,
              child: GestureDetector(
                behavior: HitTestBehavior.opaque,
                onTap: open,
                child: child,
              ),
            ),
          )
        : child;

    return Padding(
      padding: EdgeInsets.only(top: _gapAnimation.value),
      child: childWithInteraction,
    );
  }