SemanticsOwner class

Owns SemanticsNode objects and notifies listeners of changes to the render tree semantics.

To listen for semantic updates, call PipelineOwner.ensureSemantics to obtain a SemanticsHandle. This will create a SemanticsOwner if necessary.

Inheritance

Constructors

SemanticsOwner()

Properties

rootSemanticsNode SemanticsNode
The root node of the semantics tree, if any. [...]
read-only
hashCode int
The hash code for this object. [...]
read-only, inherited
hasListeners bool
Whether any listeners are currently registered. [...]
@protected, read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

dispose() → void
Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener and removeListener will throw after the object is disposed). [...]
override
performAction(int id, SemanticsAction action, [ dynamic args ]) → void
Asks the SemanticsNode with the given id to perform the given action. [...]
performActionAt(Offset position, SemanticsAction action, [ dynamic args ]) → void
Asks the SemanticsNode at the given position to perform the given action. [...]
sendSemanticsUpdate() → void
Update the semantics using Window.updateSemantics.
toString() String
Returns a string representation of this object.
override
addListener(VoidCallback listener) → void
Register a closure to be called when the object changes. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
notifyListeners() → void
Call all the registered listeners. [...]
@protected, @visibleForTesting, inherited
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes. [...]
inherited

Operators

operator ==(dynamic other) bool
The equality operator. [...]
inherited