CheckedPopupMenuItem<T> class Null safety

An item with a checkmark in a Material Design popup menu.

To show a popup menu, use the showMenu function. To create a button that shows a popup menu, consider using PopupMenuButton.

A CheckedPopupMenuItem is kMinInteractiveDimension pixels high, which matches the default minimum height of a PopupMenuItem. The horizontal layout uses ListTile; the checkmark is an Icons.done icon, shown in the ListTile.leading position.

Suppose a Commands enum exists that lists the possible commands from a particular popup menu, including Commands.heroAndScholar and Commands.hurricaneCame, and further suppose that there is a _heroAndScholar member field which is a boolean. The example below shows a menu with one menu item with a checkmark that can toggle the boolean, and one menu item without a checkmark for selecting the second option. (It also shows a divider placed between the two menu items.)

PopupMenuButton<Commands>(
  onSelected: (Commands result) {
    switch (result) {
      case Commands.heroAndScholar:
        setState(() { _heroAndScholar = !_heroAndScholar; });
        break;
      case Commands.hurricaneCame:
        // ...handle hurricane option
        break;
      // ...other items handled here
    }
  },
  itemBuilder: (BuildContext context) => <PopupMenuEntry<Commands>>[
    CheckedPopupMenuItem<Commands>(
      checked: _heroAndScholar,
      value: Commands.heroAndScholar,
      child: const Text('Hero and scholar'),
    ),
    const PopupMenuDivider(),
    const PopupMenuItem<Commands>(
      value: Commands.hurricaneCame,
      child: ListTile(leading: Icon(null), title: Text('Bring hurricane')),
    ),
    // ...other items listed here
  ],
)

In particular, observe how the second menu item uses a ListTile with a blank Icon in the ListTile.leading position to get the same alignment as the item with the checkmark.

Constructors

CheckedPopupMenuItem({Key? key, T? value, bool checked = false, bool enabled = true, EdgeInsets? padding, double height = kMinInteractiveDimension, MouseCursor? mouseCursor, Widget? child}): Creates a popup menu item with a checkmark.
const

Properties

checked → bool: Whether to display a checkmark next to the menu item.
final
child → Widget?: The widget below this widget in the tree.
read-only, override
enabled → bool: Whether the user is permitted to select this item.
final, inherited
hashCode → int: The hash code for this object.
@nonVirtual, read-only, inherited
height → double: The minimum height of the menu item.
final, inherited
key → Key?: Controls how one widget replaces another widget in the tree.
final, inherited
mouseCursor → MouseCursor?: The cursor for a mouse pointer when it enters or is hovering over the widget.
final, inherited
onTap → VoidCallback?: Called when the menu item is tapped.
final, inherited
padding → EdgeInsets?: The padding of the menu item.
final, inherited
runtimeType → Type: A representation of the runtime type of the object.
read-only, inherited
textStyle → TextStyle?: The text style of the popup menu item.
final, inherited
value → T?: The value that will be returned by showMenu if this entry is selected.
final, inherited

Methods

createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → PopupMenuItemState<T, CheckedPopupMenuItem<T>>: Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent method or property is accessed.
inherited
represents(T? value) → bool: Whether this entry represents a particular value.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode: Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String: A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String: Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String: Returns a one-line detailed description of the object.
inherited
toStringShort() → String: A short, textual description of this widget.
inherited

Operators

operator ==(Object other) → bool: The equality operator.
@nonVirtual, inherited

Flutter
material
CheckedPopupMenuItem<T> class

CheckedPopupMenuItem<T> class Null safety

Constructors

Properties

Methods

Operators

material library