AnimatedCheckPainter class
Custom painter for drawing animated checkmarks in checkboxes.
Renders a smooth checkmark animation that draws progressively from left to right in two stroke segments. The animation provides visual feedback when transitioning to the checked state, creating a satisfying user experience.
The checkmark is drawn as two connected line segments: a shorter diagonal line from bottom-left toward center, and a longer diagonal line from center to top-right. The progress parameter controls how much of the checkmark is visible.
Used internally by Checkbox - not typically instantiated directly by consumers.
- Inheritance
-
- Object
- Listenable
- CustomPainter
- AnimatedCheckPainter
Constructors
- AnimatedCheckPainter.new({required double progress, required Color color, required double strokeWidth})
- Creates an AnimatedCheckPainter.
Properties
- color → Color
-
Color used to draw the checkmark strokes.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- progress → double
-
Animation progress from 0.0 to 1.0 controlling checkmark visibility.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- semanticsBuilder → SemanticsBuilderCallback?
-
Returns a function that builds semantic information for the picture drawn
by this painter.
no setterinherited
- strokeWidth → double
-
Width of the checkmark stroke lines in logical pixels.
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 AnimatedCheckPainter 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