CheckedPopupMenuItem< T> class
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 48 pixels high, which matches the default height of a PopupMenuItem. The horizontal layout uses a 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.
See also:
- PopupMenuItem, a popup menu entry for picking a command (as opposed to toggling a value).
- PopupMenuDivider, a popup menu entry that is just a horizontal line.
- showMenu, a method to dynamically show a popup menu at a given location.
- PopupMenuButton, an IconButton that automatically shows a menu when it is tapped.
- Inheritance
- Object
- Diagnosticable
- DiagnosticableTree
- Widget
- StatefulWidget
- PopupMenuEntry<
T> - PopupMenuItem<
T> - CheckedPopupMenuItem
Constructors
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 entry. [...]
final, inherited
- hashCode → int
-
The hash code for this object. [...]
read-only, inherited
- height → double
-
The height of the entry. [...]
final, inherited
- key → Key
-
Controls how one widget replaces another widget in the tree. [...]
final, inherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
- value → T
-
The value that will be returned by showMenu if this entry is selected.
final, inherited
Methods
-
createState(
) → _CheckedPopupMenuItemState< T> -
Creates the mutable state for this widget at a given location in the tree. [...]
override
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
-
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 toStringDeep. [...]
inherited
-
toString(
{DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String -
Returns 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 ==(
dynamic other) → bool -
The equality operator. [...]
inherited