LayoutItem class abstract

An interface for widgets that participate in custom layout algorithms.

LayoutItem defines the common properties that layout widgets use to control their positioning, sizing, and behavior within a layout container. It provides a standardized way for layout algorithms to access and manipulate widget properties during the layout process.

This interface is implemented by widgets like FlexItem and AbsoluteItem that need to communicate layout constraints and positioning information to their parent layout containers.

Implemented types
Implementers
Available extensions

Constructors

LayoutItem()

Properties

asAbsoluteItem → Widget

Available on Widget, provided by the WidgetExtension extension

Explicitly wraps this widget as an AbsoluteItem.
no setter
asFlexItem → Widget

Available on Widget, provided by the WidgetExtension extension

Explicitly wraps this widget as a FlexItem.
no setter
aspectRatio → double?
The aspect ratio constraint (width/height) for this item.
no setter
bottom → PositionUnit?
The offset from the bottom edge of the parent container.
no setter
hashCode → int
The hash code for this object.
no setterinherited
height → SizeUnit?
The preferred height of this item.
no setter
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
left → PositionUnit?
The offset from the left edge of the parent container.
no setter
maxHeight → SizeUnit?
The maximum height constraint for this item.
no setter
maxWidth → SizeUnit?
The maximum width constraint for this item.
no setter
minHeight → SizeUnit?
The minimum height constraint for this item.
no setter
minWidth → SizeUnit?
The minimum width constraint for this item.
no setter
paintOrder → int?
The paint order for this item, controlling drawing order when overlapping. Lower values are painted first (behind), higher values are painted last (on top).
no setter
The offset from the right edge of the parent container.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
top → PositionUnit?
The offset from the top edge of the parent container.
no setter
width → SizeUnit?
The preferred width of this item.
no setter

Methods

aspectRatio(double aspectRatio, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the aspect ratio constraint for this widget.
bottom(PositionUnit bottom, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the distance from the bottom edge of the parent container.
constrained({SizeUnit? minWidth, SizeUnit? maxWidth, SizeUnit? minHeight, SizeUnit? maxHeight, Key? key}) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets comprehensive size constraints including both minimum and maximum bounds.
createElement() → Element
Inflates this configuration to a concrete instance.
inherited
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
flexGrow(double flexGrow, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the flex grow factor for this widget within a flex container.
flexShrink(double flexShrink, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the flex shrink factor for this widget within a flex container.
height(SizeUnit height, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the height of this widget using a SizeUnit.
id(Object valueKey) → Widget

Available on Widget, provided by the WidgetExtension extension

Assigns a ValueKey to this widget using the provided value.
key(Key key) → Widget

Available on Widget, provided by the WidgetExtension extension

Assigns a Key to this widget.
left(PositionUnit left, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the distance from the left edge of the parent container.
maxHeight(SizeUnit maxHeight, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the maximum height constraint for this widget using a SizeUnit.
maxSized({SizeUnit? maxWidth, SizeUnit? maxHeight, Key? key}) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets maximum width and height constraints simultaneously.
maxWidth(SizeUnit maxWidth, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the maximum width constraint for this widget using a SizeUnit.
minHeight(SizeUnit minHeight, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the minimum height constraint for this widget using a SizeUnit.
minSized({SizeUnit? minWidth, SizeUnit? minHeight, Key? key}) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets minimum width and height constraints simultaneously.
minWidth(SizeUnit minWidth, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the minimum width constraint for this widget using a SizeUnit.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
paintOrder(int paintOrder, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the paint order for this widget within its parent container.
position(PositionType position, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the position type for this widget to control positioning context.
positioned({PositionUnit? top, PositionUnit? left, PositionUnit? bottom, PositionUnit? right, Key? key}) → Widget

Available on Widget, provided by the WidgetExtension extension

Positions the widget using multiple edge offsets simultaneously.

Available on Widget, provided by the WidgetExtension extension

Sets the distance from the right edge of the parent container.
selfAligned(BoxAlignmentGeometry alignSelf, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the alignment of this widget within its parent flex container.
sized({SizeUnit? width, SizeUnit? height, Key? key}) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets both width and height dimensions simultaneously.
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
top(PositionUnit top, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the distance from the top edge of the parent container.
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited
width(SizeUnit width, [Key? key]) → Widget

Available on Widget, provided by the WidgetExtension extension

Sets the width of this widget using a SizeUnit.

Operators

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