maybeOf static method

double? maybeOf(BuildContext context)

Returns the height of the bottom navigation bar if it exists, otherwise returns null.

It supports BottomAppBar, NavigationBar, and BottomNavigationBar.

The Scaffold is resolved with ScaffoldFinder, so this also works when context sits above the Scaffold it belongs to.

Example:

final bottomBarHeight = BottomBarHeight.maybeOf(context);

Implementation

static double? maybeOf(BuildContext context) =>
    switch (ScaffoldFinder.maybeOf(context)?.widget.bottomNavigationBar) {
      BottomAppBar _ => Theme.of(context).bottomAppBarTheme.height ?? 80,
      NavigationBar _ => Theme.of(context).navigationBarTheme.height ?? 80,
      BottomNavigationBar _ => kBottomNavigationBarHeight, // 58 actually
      null => null,
      _ => _fallbackHeight(context),
    };