SnapshotController class

A controller for the SnapshotWidget that controls when the child image is displayed and when to regenerated the child image.

When the value of allowSnapshotting is true, the SnapshotWidget will paint the child widgets based on the SnapshotMode of the snapshot widget.

The controller notifies its listeners when the value of allowSnapshotting changes or when clear is called.

To force SnapshotWidget to recreate the child image, call clear.



SnapshotController({bool allowSnapshotting = false})
Create a new SnapshotController.


allowSnapshotting bool
Whether a snapshot of this child widget is painted in its place.
getter/setter pair
hashCode int
The hash code for this object.
no setterinherited
hasListeners bool
Whether any listeners are currently registered.
no setterinherited
runtimeType Type
A representation of the runtime type of the object.
no setterinherited


addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
clear() → void
Reset the snapshot held by any listening SnapshotWidget.
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 will throw after the object is disposed).
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
notifyListeners() → void
Call all the registered listeners.
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
toString() String
A string representation of this object.


operator ==(Object other) bool
The equality operator.