ScribbleNotifier class - scribble library

Constructors

ScribbleNotifier({Sketch? sketch, ScribblePointerMode allowedPointersMode = ScribblePointerMode.all, int maxHistoryLength = 30, List<double> widths = const [5, 10, 15], Curve pressureCurve = Curves.linear, SketchSimplifier simplifier = const VisvalingamSimplifier(), double simplificationTolerance = 0}): The default implementation of a ScribbleNotifierBase.

Properties

allowOperations → bool: You can override this to prevent undo/redo operations in certain cases (e.g. when in a loading value)
no setterinherited
canRedo → bool: Whether a redo operation is currently possible.
no setterinherited
canUndo → bool: Whether currently an undo operation is possible.
no setterinherited
currentSketch → Sketch: The state of the sketch at this moment.
no setter
hashCode → int: The hash code for this object.
no setterinherited
hasListeners → bool: Whether any listeners are currently registered.
no setterinherited
includeInitialValueInHistory → bool: Whether to include the initial value in the undo history.
no setterinherited
maxHistoryLength ↔ int?: How many values to keep track of.
getter/setter pairinherited
pressureCurve → Curve: The curve that's used to map pen pressure to the pressure value when recording, by default it's linear.
final
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 setteroverride
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
simplifier → SketchSimplifier: The SketchSimplifier that is used to simplify the lines of the sketch.
final
temporaryValue ← ScribbleState: Sets the current "value" of this HistoryValueNotifier without adding the new value to the undo history.
no getterinherited
value ↔ ScribbleState: The current value stored in this notifier.
getter/setter pairinherited
widths → List<double>: The supported widths, mainly useful for rendering UI, you can still set the width to any arbitrary value from code.
final

Methods

addListener(VoidCallback listener) → void: Register a closure to be called when the object changes.
inherited
clear() → void: Clear the entire drawing.
clearQueue() → void: Removes all history items from the queue.
inherited
clearRedoQueue() → void: Removes all history items that happened after the current undo position.
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: Used by the Listener callback to stop displaying the cursor
override
onPointerDown(PointerDownEvent event) → void: Used by the Listener callback to start drawing
override
onPointerExit(PointerExitEvent event) → void: Should be called when the pointer exits the canvas with the corresponding event.
override
onPointerHover(PointerHoverEvent event) → void: Used by the Listener callback to display the pen if desired
override
onPointerUp(PointerUpEvent event) → void: Used by the Listener callback to finish a line
override
onPointerUpdate(PointerMoveEvent event) → void: Used by the Listener callback to update the drawing
override
redo() → void: Proceeds to the next value in the history.
inherited
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.
inherited
setAllowedPointersMode(ScribblePointerMode allowedPointersMode) → void: Sets the current mode of allowed pointers to the given ScribblePointerMode
setColor(Color color) → void: Sets the color of the pen to the given color.
setEraser() → void: Switches to eraser mode
setScaleFactor(double factor) → void: Sets the zoom factor to allow for adjusting line width.
setSimplificationTolerance(double degree) → void: Sets the simplification degree for the sketch in logical pixels.
setSketch({required Sketch sketch, bool addToUndoHistory = true}) → void: Can be used to update the state of the Sketch externally (e.g. when fetching from a server) to what is passed in as sketch;
setStrokeWidth(double strokeWidth) → void: Sets the width of the next line
shouldInsertValueIntoQueue(ScribbleState newValue, ScribbleState lastInQueue) → bool: You can override this function if you want to filter certain values before adding them to the history.
inherited
simplify({bool addToUndoHistory = true}) → void: Simplifies the current sketch to the current simplification degree using simplifier.
toString() → String: A string representation of this object.
inherited
transformHistoryValue(ScribbleState historyValue, ScribbleState currentState) → ScribbleState: Only apply the sketch from the undo history, otherwise keep current state
undo() → void: Returns to the previous value in the history.
inherited

Operators

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