LazyCanvasController class - controller library

Constructors

LazyCanvasController({bool debug = false, Offset? buildCacheExtent, Size hashCellSize = const Size(100, 100), Duration defaultAnimationDuration = const Duration(milliseconds: 300), CanvasBackground background = const DotGridBackground(), bool useIdsFromArgs = false, OnWidgetEnteredRender? onWidgetEnteredRender, OnWidgetExitedRender? onWidgetExitedRender, PointerSignalEventListener? rawPointerSignalListener, PointerDownEventListener? rawPointerDownListener, PointerMoveEventListener? rawPointerMoveListener, PointerUpEventListener? rawPointerUpListener, PointerCancelEventListener? rawPointerCancelListener})

Properties

background ↔ CanvasBackground: getter/setter pair
buildCacheExtent → Offset?: no setter
buildExtent → Offset: no setter
canvasSize → Size: no setter
debug ↔ bool: getter/setter pair
defaultAnimationDuration → Duration: final
hashCode → int: The hash code for this object.
no setterinherited
hasListeners → bool: Whether any listeners are currently registered.
no setterinherited
offset → Offset: no setter
onWidgetEnteredRender ↔ OnWidgetEnteredRender?: getter/setter pair
onWidgetExitedRender ↔ OnWidgetExitedRender?: getter/setter pair
rawPointerCancelListener ↔ PointerCancelEventListener?: getter/setter pair
rawPointerDownListener ↔ PointerDownEventListener?: getter/setter pair
rawPointerMoveListener ↔ PointerMoveEventListener?: getter/setter pair
rawPointerSignalListener ↔ PointerSignalEventListener?: getter/setter pair
rawPointerUpListener ↔ PointerUpEventListener?: getter/setter pair
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
scale → double: no setter
useIdsFromArgs → bool: final

Methods

addChild(Offset position, Widget widget, {Size? childSize, CanvasChildId? id}) → CanvasChildId: Add a child at a given position with a widget. Returns the child ID. You need the child size for optimising the focus on child
addChildren(List<CanvasChildArgs> children, {CanvasChildId? focusOnBuild}) → List<CanvasChildId>
addListener(VoidCallback listener) → void: Register a closure to be called when the object changes.
inherited
animateToOffsetAndScale({required Offset offset, required double scale, Duration? duration, Curve curve = Curves.easeInOut}) → Future<void>: Animate the canvas to a new offset and scale
centerOnGridOffset(Offset gsOffset, {Duration? duration, bool animate = true}) → void: Center the canvas so that the given grid-space offset is at the center of the viewport.
centerOnScreenOffset(Offset ssOffset, {Duration? duration, bool animate = true}) → void: Center the canvas so that the given screen-space offset is at the center of the viewport.
clear() → void: Remove all children. Does not change where you are on the canvas.
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
focusOnChild(CanvasChildId id, {ScalingMode scalingMode = ScalingMode.keepScale, bool animate = true, double preferredHorizontalMargin = 16, Duration? duration, Size? childSize, dynamic forceRedraw = false}) → void: Focus the viewport on a child by its ID, with a margin in screen-space. If it's already rendered, size will be picked up from the child widget. If not an offstage rendering will be used ( double render ) Preferred horizontal margin used for ScalingMode.fitInViewport.
hasChild(CanvasChildId id) → bool: Returns true if the child exists, false otherwise.
markDirty() → void
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void: Call all the registered listeners.
inherited
onCanvasSizeChange(Size size) → void: Update the canvas size when the widget size changes.
onChildSizeChange(CanvasChildId id, Size size) → void: Called when a child widget's size changes.
onScaleStart(ScaleStartDetails details) → void: Called when a scale gesture starts.
onScaleUpdate(ScaleUpdateDetails details) → void: Called when a scale gesture updates. Usually you would not want to override this
removeChild(CanvasChildId id) → void: Remove a child by its ID.
removeListener(VoidCallback listener) → void: Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
setBuildCacheExtent(Offset extent) → void: Applied on the next build
setBuildContext(BuildContext context) → void
setTickerProvider(TickerProvider ticker) → void: Set the ticker provider for animations.
toString() → String: A string representation of this object.
inherited
updateChildWidget(CanvasChildId id, Widget newWidget) → void: Update a child's widget.
updatePosition(CanvasChildId id, Offset newPosition) → CanvasChildId: Update the position of a child by its ID.
updateScalebyDelta(double delta, {Offset? focalPoint}) → void: Increment or decrement the scale by an additive delta value.
widgetsWithScreenPositions({bool forceRebuild = false}) → List<ChildInfo>: Currently rendered widgets with their position info

Operators

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