SnapshotController class Null safety

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.

Inheritance

Constructors

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

Properties

allowSnapshotting bool
Whether a snapshot of this child widget is painted in its place.
read / write
hashCode int
The hash code for this object.
read-onlyinherited
hasListeners bool
Whether any listeners are currently registered.
read-onlyinherited
runtimeType Type
A representation of the runtime type of the object.
read-onlyinherited

Methods

addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
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).
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
toString() String
A string representation of this object.
inherited

Operators

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