ParentComponentInstance class abstract Components Core Layout

Base class for a component instance that has child components.

A ParentComponentInstance represents a ComponentInstance that can contain other ComponentInstances, and optionally control their layout direction and rendering behavior.

See also:

• ComponentInstance — the base interface for all component instances.
• AppInstance — a specialized parent instance that owns the application's root component tree.

Inheritance

• Object
• ComponentInstance
• ParentComponentInstance

Implementers

• AppInstance
• BuildableComponentInstance
• StatefulComponentInstance

Constructors

ParentComponentInstance.new(Component component)

Creates a parent component instance for the given component.

Properties

bounds ↔ Rect

The current layout bounds for this component instance.

getter/setter pair, inherited

childrenInstance → List<ComponentInstance>

The direct child component instances managed by this parent.

no setter

direction → Axis

The primary axis along which children are laid out. Defaults to vertical stacking.

no setter

hashCode → int

The hash code for this object.

no setter, inherited

padding → EdgeInsets

The padding inside the component’s allocated space.

final, inherited

position → Position

The position of this component relative to its parent or container.

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

fitHeight() → int

Returns the height this component should occupy based on its content or layout rules.

inherited

fitWidth() → int

Returns the width this component should occupy based on its content or layout rules.

inherited

measure(Size maxSize) → Size

Measures the size this component would like to occupy, given a maximum available size.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

render(CanvasBuffer buffer, Rect bounds) → void

Renders the component into the provided CanvasBuffer using the given bounds as the drawing area.

inherited

shouldRenderChild(ComponentInstance child) → bool

Determines whether a given child should be rendered. Defaults to false, meaning the decision is left to layout/rendering code.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited