ScribbleNotifierBase class abstract
The base class for a notifier that controls the state of a Scribble widget.
This class is meant to be extended by a concrete implementation that provides the actual behavior.
See ScribbleNotifier for the default implementation.
- Inheritance
-
- Object
- ChangeNotifier
- ValueNotifier<
ScribbleState> - ScribbleNotifierBase
- Implementers
Constructors
- ScribbleNotifierBase(ScribbleState state)
- The base class for a notifier that controls the state of a Scribble widget.
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- hasListeners → bool
-
Whether any listeners are currently registered.
no setterinherited
-
repaintBoundaryKey
→ GlobalKey<
State< StatefulWidget> > -
You need to provide a key that the RepaintBoundary can use so you can
access it from the renderImage method.
no setter
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- value ↔ ScribbleState
-
The current value stored in this notifier.
getter/setter pairinherited
Methods
-
addListener(
VoidCallback listener) → void -
Register a closure to be called when the object changes.
inherited
-
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 nonexistent method or property is accessed.
inherited
-
notifyListeners(
) → void -
Call all the registered listeners.
inherited
-
onPointerCancel(
PointerCancelEvent event) → void -
Should be called when the pointer is canceled with the corresponding
event. -
onPointerDown(
PointerDownEvent event) → void -
Should be called when the pointer is pressed down on the canvas with the
corresponding
event. -
onPointerExit(
PointerExitEvent event) → void -
Should be called when the pointer exits the canvas with the corresponding
event. -
onPointerHover(
PointerHoverEvent event) → void -
Should be called when the pointer hovers over the canvas with the
corresponding
event. -
onPointerUp(
PointerUpEvent event) → void -
Should be called when the pointer is lifted from the canvas with the
corresponding
event. -
onPointerUpdate(
PointerMoveEvent event) → void -
Should be called when the pointer is moved on the canvas with the
corresponding
event. -
removeListener(
VoidCallback listener) → void -
Remove a previously registered closure from the list of closures that are
notified when the object changes.
inherited
-
renderImage(
{double pixelRatio = 1.0, ImageByteFormat format = ui.ImageByteFormat.png}) → Future< ByteData> - Used to render the image to ByteData which can then be stored or reused for example in an Image.memory widget.
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited