SliverBoxyDelegate<LayoutData extends Object> class abstract

A delegate that controls the layout and paint of child widgets, used by CustomBoxy.

This is similar to BoxyDelegate, but uses the RenderSliver protocol and supports both BoxyChild and SliverBoxyChild children.

See also:

Inheritance

Constructors

SliverBoxyDelegate({Listenable? relayout, Listenable? repaint})
Constructs a BoxyDelegate with optional relayout and repaint Listenables.

Properties

buildContext → BuildContext
Gets the BuildContext of this boxy.
no setterinherited
canvas → Canvas
The current canvas, should only be accessed from paint methods.
no setterinherited
children → List<BaseBoxyChild>
A list of each BoxyChild handle associated with the boxy, the list itself should not be modified by the delegate.
no setterinherited
childrenForSemantics → Iterable<BaseBoxyChild>
An iterable of children to be visited for semantics, in paint order, skipping children that are not semantically relevant.
no setterinherited
constraints → SliverConstraints
The most recent constraints given to this boxy by its parent.
no setteroverride
debugPhase → BoxyDelegatePhase
The current phase in the render pipeline that this boxy is performing, only valid in debug mode.
no setterinherited
hashCode → int
The hash code for this object.
no setterinherited
hitTestResult → HitTestResult
The current hit test result, should only be accessed from hitTest.
no setterinherited
indexedChildCount → int
The number of children that have not been given a BoxyId, this guarantees there are child ids between 0 (inclusive) and indexedChildCount (exclusive).
no setterinherited
layers → BoxyLayerContext
The current layer context, useful for pushing Layers to the scene during paintChildren.
no setterinherited
layoutData ↔ LayoutData?
A variable to hold additional data created during layout which can be used while painting and hit testing.
getter/setter pairinherited
needsCompositing → bool
Override this method to return true if the paint method will push one or more layers to paintingContext.
no setterinherited
paintingContext → PaintingContext
The current painting context, should only be accessed from paint methods.
no setterinherited
paintOffset → Offset
The offset of the current paint context.
no setterinherited
render → RenderSliverBoxy<BaseBoxyChild>
The RenderBoxyMixin of the current context.
no setteroverride
renderSize → SliverSize
The last size returned by layout.
no setteroverride
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

addHit() → void
Adds the boxy to hitTestResult, this should typically be called from hitTest when a hit succeeds.
override
getChild<T extends ChildHandleType>(Object id) → T
Gets the child handle with the specified id.
inherited
getChildOrNull<T extends ChildHandleType>(Object id) → T?
Gets the child handle with the specified id or returns null if there is no child with given id.
inherited
hasChild(Object id) → bool
Returns true if a child exists with the specified id.
inherited
hitTest(SliverOffset position) → bool
Override this method to change how the boxy gets hit tested.
inherited
inflate<T extends ChildHandleType>(Widget widget, {Object? id}) → T
Dynamically inflates a widget as a child of this boxy, should only be called in BoxyChild.layout.
inherited
layout() → SliverGeometry
Override this method to lay out children and return the final geometry of the boxy.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
onPointerEvent(PointerEvent event, covariant SliverHitTestEntry entry) → void
Override to handle pointer events that hit this boxy.
override
paint() → void
Override this method to paint below children.
inherited
paintChildren() → void
Override this method to change how children get painted.
inherited
paintForeground() → void
Override this method to paint above children.
inherited
paintLayer(ContainerLayer layer, {VoidCallback? painter, Offset? offset, Rect? debugBounds}) → void
Paints a ContainerLayer compositing layer in the current painting context with an optional painter callback, this should only be called in paintChildren.
inherited
shouldRelayout(covariant BaseBoxyDelegate<Object, BaseBoxyChild> oldDelegate) → bool
Override this method to return true when the children need to be laid out.
inherited
shouldRepaint(covariant BaseBoxyDelegate<Object, BaseBoxyChild> oldDelegate) → bool
Override this method to return true when the children need to be repainted.
inherited
toString() → String
Override this method to include additional information in the debugging data printed by debugDumpRenderTree and friends.
inherited

Operators

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