CartesianCanvasController class

A controller for interacting programmatically with a CartesianPlane.

This controller can be passed to a CartesianPlane to allow external widgets to trigger view resets, zoom, freehand drawing modes, and more.

Inheritance

Constructors

CartesianCanvasController()

Properties

canvasDelegate ↔ CartesianCanvasDelegate?
The attached delegate, usually provided by the CartesianPlane's state.
getter/setter pair
drawingMode ↔ bool
Whether the drawing mode is active.
getter/setter pair
eraserMode ↔ bool
Whether the eraser mode is active.
getter/setter pair
gridVisible ↔ bool
Whether the grid is currently visible.
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

Methods

addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
attach(CartesianCanvasDelegate newDelegate) → void
Attaches a newDelegate to this controller. Called automatically by CartesianPlane.
captureImage() → Future<Image?>
Captures and returns an image of the current canvas viewport.
clearFreehand() → void
Deletes all freehand strokes drawn on the canvas.
detach() → void
Detaches the current delegate from this controller.
dispose() → void
Discards any resources used by the object.
inherited
fitToContent() → void
Adjusts the scale and origin to fit all elements currently on the plane.
goToPoint(double x, double y) → void
Moves the center of the camera to the specified world coordinates x and y.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
redoFreehand() → void
Redoes the last undone freehand drawing or erase action.
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
resetView() → void
Resets the CartesianPlane view to the initial scale and origin.
setDrawingMode(bool isEnabled) → void
Helper method to toggle or set drawing mode.
setEraserMode(bool isEnabled) → void
Helper method to toggle or set eraser mode.
setGridVisible(bool isVisible) → void
Helper method to toggle or set grid visibility.
toString() → String
A string representation of this object.
inherited
undoFreehand() → void
Undoes the last freehand drawing or erase action.
zoomIn() → void
Zooms the canvas in by a fixed multiplier.
zoomOut() → void
Zooms the canvas out by a fixed multiplier.

Operators

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