Add a Popup Menu Button in an App Bar - Classes | Flutter for Web
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.
When not used as Scaffold.appBar, or when wrapped in a Hero, place the app bar in a MediaQuery to take care of the padding around the content of the app bar if needed, as the padding will not be handled by Scaffold.
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