BuilderFlexItem class
A builder variant of FlexItem that allows dynamic child construction.
BuilderFlexItem provides the same flex layout capabilities as DirectFlexItem, but instead of taking a pre-built child widget, it accepts a builder function that receives layout information at build time.
This is useful when the flex content needs access to layout bounds, scroll positions, or other dynamic layout state that may change during the widget's lifetime.
Usage
BuilderFlexItem(
flexGrow: 1.0,
builder: (context, layoutBox) {
return Container(
color: Colors.blue,
child: Text('Size: ${layoutBox.size}'),
);
},
)
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- BuilderFlexItem
- Implemented types
Constructors
- BuilderFlexItem.new({Key? key, required Widget builder(BuildContext context, LayoutBox box), int? paintOrder, SizeUnit? width, SizeUnit? height, SizeUnit? minWidth, SizeUnit? maxWidth, SizeUnit? minHeight, SizeUnit? maxHeight, double flexGrow = 0.0, double flexShrink = 0.0, double? aspectRatio, PositionUnit? top, PositionUnit? left, PositionUnit? bottom, PositionUnit? right, BoxAlignmentGeometry? alignSelf})
-
Creates a flex item with a builder function.
const
Properties
- alignSelf → BoxAlignmentGeometry?
-
final
- aspectRatio → double?
-
The aspect ratio constraint (width/height) for this item.
final
- bottom → PositionUnit?
-
The offset from the bottom edge of the parent container.
final
- builder → Widget Function(BuildContext context, LayoutBox box)
-
final
- flexGrow → double
-
The flex grow factor for this item.
final
- flexShrink → double
-
The flex shrink factor for this item.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- height → SizeUnit?
-
The preferred height of this item.
final
- 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.
final
- maxHeight → SizeUnit?
-
The maximum height constraint for this item.
final
- maxWidth → SizeUnit?
-
The maximum width constraint for this item.
final
- minHeight → SizeUnit?
-
The minimum height constraint for this item.
final
- minWidth → SizeUnit?
-
The minimum width constraint for this item.
final
- 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).
final
- right → PositionUnit?
-
The offset from the right edge of the parent container.
final
- 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.
final
- width → SizeUnit?
-
The preferred width of this item.
final
Methods
-
build(
BuildContext context) → Widget -
Builds the widget tree for this builder flex item.
override
-
createElement(
) → StatelessElement -
Creates a StatelessElement to manage this widget's location in the tree.
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