• ElevatedButton
  A Material Design elevated button. A filled button whose material elevates when pressed.

• OutlinedButton
  A Material Design outlined button, essentially a TextButton with an outlined border. Outlined buttons are medium-emphasis buttons. They contain actions that are important, but they aren’t the primary action in an app.

• IconButton An icon button is a picture printed on a Material widget that reacts to touches by filling with color (ink).
  • isSelected : The selectedIcon feature is only available for Material3

• PopupMenuButton Displays a menu when pressed and calls onSelected when the menu is dismissed because an item was selected.

• DropdownButton Shows the currently selected item and an arrow that opens a menu for selecting another item.

• TextButton A Material Design text button. A simple flat button without a border outline.

• FloatingActionButton A floating action button is a circular icon button that hovers over content to promote a primary action in the application. Floating action buttons are most commonly used in the Scaffold.floatingActionButton field.

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