responsive_design library Null safety
- It must be used in a ResponsiveAppBar in actions.
- An AppBar that adapts to different screen sizes.
- Manage the responsive screen settings.
- Utilitie to check the screen size by device.
- Responsive widget that adapts to the size of the screens.
- Manage the responsive change points.
- A left sidebar of the Scaffold.
- Sidebar item to use in Sidebar widget.
- Responsive with all screen types.