PlatformMenuDelegate class Null safety
An abstract delegate class that can be used to set WidgetsBinding.platformMenuDelegate to provide for managing platform menus.
This can be subclassed to provide a different menu plugin than the default system-provided plugin for managing PlatformMenuBar menus.
The setMenus method allows for setting of the menu hierarchy when the PlatformMenuBar menu hierarchy changes.
This delegate doesn't handle the results of clicking on a menu item, which
is left to the implementor of subclasses of PlatformMenuDelegate
to
handle for their implementation.
This delegate typically knows how to serialize a PlatformMenu hierarchy, send it over a channel, and register for calls from the channel when a menu is invoked or a submenu is opened or closed.
See DefaultPlatformMenuDelegate for an example of implementing one of these.
See also:
- PlatformMenuBar, the widget that adds a platform menu bar to an application, and uses setMenus to send the menus to the platform.
- PlatformMenu, the class that describes a menu item with children that appear in a cascading menu.
- PlatformMenuItem, the class that describes the leaves of a menu hierarchy.
- Implementers
Constructors
- PlatformMenuDelegate()
-
A const constructor so that subclasses can have const constructors.
const
Properties
- hashCode → int
-
The hash code for this object.
read-onlyinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
Methods
-
clearMenus(
) → void - Clears any existing platform-rendered menus and leaves the application with no menus.
-
debugLockDelegate(
BuildContext context) → bool - This is called by PlatformMenuBar when it is initialized, to be sure that only one is active at a time.
-
debugUnlockDelegate(
BuildContext context) → bool - This is called by PlatformMenuBar when it is disposed, so that another one can take over.
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited
-
setMenus(
List< MenuItem> topLevelMenus) → void - Sets the entire menu hierarchy for a platform-rendered menu bar.
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited