WhiteboardPainter class
CustomPainter that renders all shapes on the whiteboard canvas.
This painter handles rendering of all shape types including freehand drawings, geometric shapes, text, and images with support for zoom and pan transformations.
- Inheritance
-
- Object
- Listenable
- CustomPainter
- WhiteboardPainter
Constructors
-
WhiteboardPainter.new({required List<
WhiteboardShape> shapes, WhiteboardShape? currentShape, required Offset panOffset, required double scale, required double maxWidth, required double maxHeight, bool useImageBackground = false, Image? backgroundImage, WhiteboardShape? selectedShape, Offset? eraserCursorPosition, double eraserThickness = 10.0, bool transparentBackground = false})
Properties
- backgroundImage → Image?
-
Background image (if any).
final
- currentShape → WhiteboardShape?
-
Current shape being drawn (preview).
final
- eraserCursorPosition → Offset?
-
Eraser cursor position (for visual feedback).
final
- eraserThickness → double
-
Eraser thickness.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- maxHeight → double
-
Maximum canvas height.
final
- maxWidth → double
-
Maximum canvas width.
final
- panOffset → Offset
-
Current pan offset.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- scale → double
-
Current zoom scale.
final
- selectedShape → WhiteboardShape?
-
Selected shape for highlighting.
final
- semanticsBuilder → SemanticsBuilderCallback?
-
Returns a function that builds semantic information for the picture drawn
by this painter.
no setterinherited
-
shapes
→ List<
WhiteboardShape> -
List of shapes to render.
final
- transparentBackground → bool
-
Whether to use a transparent background (for screen annotation overlays).
final
- useImageBackground → bool
-
Whether to use image background.
final
Methods
-
addListener(
VoidCallback listener) → void -
Register a closure to be notified when it is time to repaint.
inherited
-
hitTest(
Offset position) → bool? -
Called whenever a hit test is being performed on an object that is using
this custom paint delegate.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
paint(
Canvas canvas, Size size) → void -
Called whenever the object needs to paint. The given Canvas has its
coordinate space configured such that the origin is at the top left of the
box. The area of the box is the size of the
sizeargument.override -
removeListener(
VoidCallback listener) → void -
Remove a previously registered closure from the list of closures that the
object notifies when it is time to repaint.
inherited
-
shouldRebuildSemantics(
covariant CustomPainter oldDelegate) → bool -
Called whenever a new instance of the custom painter delegate class is
provided to the RenderCustomPaint object, or any time that a new
CustomPaint object is created with a new instance of the custom painter
delegate class (which amounts to the same thing, because the latter is
implemented in terms of the former).
inherited
-
shouldRepaint(
covariant WhiteboardPainter oldDelegate) → bool -
Called whenever a new instance of the custom painter delegate class is
provided to the RenderCustomPaint object, or any time that a new
CustomPaint object is created with a new instance of the custom painter
delegate class (which amounts to the same thing, because the latter is
implemented in terms of the former).
override
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited