LayoutData class final
Data structure containing all layout properties for a child element.
LayoutData encapsulates sizing constraints, positioning information, flex properties, and alignment settings that control how a child is laid out within its parent container.
This class is immutable and used throughout the layout system to communicate layout requirements between widgets and layout algorithms.
Constructors
- LayoutData({Object? key, PositionType position = PositionType.relative, LayoutBehavior behavior = LayoutBehavior.none, double flexGrow = 0.0, double flexShrink = 0.0, int? paintOrder, SizeUnit? width = SizeUnit.fitContent, SizeUnit? height = SizeUnit.fitContent, SizeUnit? minWidth, SizeUnit? maxWidth, SizeUnit? minHeight, SizeUnit? maxHeight, PositionUnit? top, PositionUnit? left, PositionUnit? right, PositionUnit? bottom, double? aspectRatio, BoxAlignmentGeometry? alignSelf})
-
Creates layout data with the specified properties.
const
Properties
- alignSelf → BoxAlignmentGeometry?
-
The cross-axis alignment override for this specific child.
final
- aspectRatio → double?
-
The aspect ratio constraint (width/height).
final
- behavior → LayoutBehavior
-
The layout behavior for this child (normal flow or absolute positioning).
final
- bottom → PositionUnit?
-
The bottom offset for absolute positioning.
final
- flexGrow → double
-
The flex grow factor for flexible sizing.
final
- flexShrink → double
-
The flex shrink factor for flexible sizing.
final
- hashCode → int
-
The hash code for this object.
no setteroverride
- height → SizeUnit?
-
The explicit height of this child.
final
- key → Object?
-
final
- left → PositionUnit?
-
The left offset for absolute positioning.
final
- maxHeight → SizeUnit?
-
The maximum height constraint.
final
- maxWidth → SizeUnit?
-
The maximum width constraint.
final
- minHeight → SizeUnit?
-
The minimum height constraint.
final
- minWidth → SizeUnit?
-
The minimum width constraint.
final
- paintOrder → int?
-
The paint order for controlling drawing sequence.
final
- position → PositionType
-
final
- right → PositionUnit?
-
The right offset for absolute positioning.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- top → PositionUnit?
-
The top offset for absolute positioning.
final
- width → SizeUnit?
-
The explicit width of this child.
final
Methods
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
override
Constants
- empty → const LayoutData