body method

@override Widget body(BuildContext context)

Provide the body of the webpage

Implementation

@override
Widget body(BuildContext context) {
  //
  StackWidgetProperties? stackProps;

  Widget? _child;

  try {
    /// Retrieve the main content if any.
    _child = scrollChild(context);
  } catch (ex, stack) {
    _child = null;
    FlutterError.reportError(FlutterErrorDetails(
      exception: ex,
      stack: stack,
      library: 'webpage_base.dart',
      context: ErrorDescription('_child = scrollChild(context)'),
    ));
    // Make the error known if under development.
    if (App.inDebugger) {
      rethrow;
    }
  }

  Widget? _overlay;

  ///
  stackProps = screenOverlay(context);

  /// Display the overlay if it exists
  if (_child == null) {
    _child = stackProps?.child;
  } else {
    _overlay = stackProps?.child;
  }

  /// If there is indeed no content to be displayed.
  if (_child == null) {
    //
    final FlutterErrorDetails details = FlutterErrorDetails(
      exception: Exception('No web content was supplied?'),
      library: 'webpage_base.dart',
      context: ErrorDescription(
          "Please, look to the 'controller' for providing content."),
    );

    FlutterError.reportError(details);
    // Notify the developer. Leave an 'empty screen' in production.
    if (App.inDebugger) {
      _child = ErrorWidget.builder(details);
    }
  } else {
    //
    _child = SingleChildScrollView(
      scrollDirection: scrollDirection ?? Axis.vertical,
      reverse: reverse ?? false,
      padding: padding,
      primary: false,
      physics: physics ?? const ClampingScrollPhysics(),
      controller: scrollController,
      dragStartBehavior: dragStartBehavior ?? DragStartBehavior.start,
      clipBehavior: clipBehavior ?? Clip.hardEdge,
      keyboardDismissBehavior:
          keyboardDismissBehavior ?? ScrollViewKeyboardDismissBehavior.manual,
      child: _child,
    );

    ///
    if (_overlay != null) {
      _child = Stack(
        alignment: stackProps?.alignment ?? AlignmentDirectional.topStart,
        textDirection: stackProps?.textDirection,
        fit: stackProps?.fit ?? StackFit.loose,
        clipBehavior: stackProps?.clipBehavior ?? Clip.hardEdge,
        children: [
          _child,
          _overlay,
        ],
      );
    }
  }
  return WebScrollbar(
    color: Colors.blueGrey,
    backgroundColor: Colors.blueGrey.withOpacity(0.3),
    width: 16,
    heightFraction: 0.3,
    controller: scrollController,
    child: _child ?? const SizedBox(),
  );
}