LiveBackdropPainter class

Paints the calculator background — the per-frame theme's background colour and its backdrop (gradient / pattern) — by repainting only.

Inheritance
Available extensions

Constructors

LiveBackdropPainter({required ValueListenable<CalcThemeData> theme, Rect? textSafeArea, Rect? toolbarExclusion, bool reduceMotion = false})

Properties

backdropPainter → CustomPainter?
The backdrop's own painter this frame (null: a plain colour).
no setter
hashCode → int
The hash code for this object.
no setterinherited
keyFaceDelegate → CustomPainter

Available on CustomPainter, provided by the LiveKeyFacePainterAccess extension

The renderer's painter behind a LiveKeyFacePainter (this painter otherwise).
no setter
reduceMotion → bool
Freezes any backdrop drift.
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
textSafeArea → Rect?
Display text area the backdrop keeps plain.
final
theme → ValueListenable<CalcThemeData>
The per-frame theme.
final
toolbarExclusion → Rect?
Toolbar chrome the backdrop's scene art keeps clear of (the mode button).
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 size argument.
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 LiveBackdropPainter 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