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
Constructors
Properties
- 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
- right → PositionUnit?
-
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
-
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
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
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
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited