Flutter Tutorial | Flutter Scaffold and AppBar Widgets | Scaffold in Flutter | AppBar in Flutter |#3

AppBar is usually the topmost component of the app (or sometimes the bottom-most), it contains the toolbar and some other common action buttons. As all the components in a flutter application is a widget or a combination of widgets. So AppBar is also a built-in class or widget in flutter which gives the functionality of the AppBar out of the box. The AppBar widget is based on Material Design and much of the information is already provided by other classes like MediaQuery, Scaffold as to where the content of the AppBar should be placed. Though the AppBar class is very flexible and can be easily customized, we can also use SilverAppBar widget which gives scrollable functionality to the app bar. Or we can create our own custom app bar from scratch.

Flutter Scaffold widget Implements the basic material design visual layout structure. This class provides APIs for showing drawers and bottom sheets. To display a persistent bottom sheet, obtain the ScaffoldState for the current BuildContext via Scaffold.of and use the ScaffoldState.showBottomSheet function.

A material design app bar.

An app bar consists of a toolbar and potentially other widgets, such as a TabBar and a FlexibleSpaceBar. App bars typically expose one or more common actions with IconButtons which are optionally followed by a PopupMenuButton for less common operations (sometimes called the "overflow menu").

App bars are typically used in the Scaffold.appBar property, which places the app bar as a fixed-height widget at the top of the screen. For a scrollable app bar, see SliverAppBar, which embeds an AppBar in a sliver for use in a CustomScrollView.

The AppBar displays the toolbar widgets, leading, title, and actions, above the bottom (if any). The bottom is usually used for a TabBar. If a flexibleSpace widget is specified then it is stacked behind the toolbar and the bottom widget. The following diagram shows where each of these slots appears in the toolbar when the writing language is left-to-right (e.g. English):

The AppBar insets its content based on the ambient MediaQuery's padding, to avoid system UI intrusions. It's taken care of by Scaffold when used in the Scaffold.appBar property. When animating an AppBar, unexpected MediaQuery changes (as is common in Hero animations) may cause the content to suddenly jump. Wrap the AppBar in a MediaQuery widget, and adjust its padding such that the animation is smooth.

Scaffold class in Flutter with Examples Scaffold is a class in flutter which provides many widgets or we can say APIs like Drawer, SnackBar, BottomNavigationBar, FloatingActionButton, AppBar etc. Scaffold will expand or occupy the whole device screen. It will occupy the available space. Scaffold will provide a framework to implement the basic material design layout of the application.

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