CustomSingleChildLayout class
A widget that defers the layout of its single child to a delegate.
The delegate can determine the layout constraints for the child and can decide where to position the child. The delegate can also determine the size of the parent, but the size of the parent cannot depend on the size of the child.
See also:
- SingleChildLayoutDelegate, which controls the layout of the child.
- Align, which sizes itself based on its child's size and positions the child according to an Alignment value.
- FractionallySizedBox, which sizes its child based on a fraction of its own size and positions the child according to an Alignment value.
- CustomMultiChildLayout, which uses a delegate to position multiple children.
- The catalog of layout widgets.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- RenderObjectWidget
- SingleChildRenderObjectWidget
- CustomSingleChildLayout
Constructors
- CustomSingleChildLayout({Key? key, required SingleChildLayoutDelegate delegate, Widget? child})
-
Creates a custom single child layout.
const
Properties
- child → Widget?
-
The widget below this widget in the tree.
finalinherited
- delegate → SingleChildLayoutDelegate
-
The delegate that controls the layout of the child.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
createElement(
) → SingleChildRenderObjectElement -
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
inherited
-
createRenderObject(
BuildContext context) → RenderCustomSingleChildLayoutBox -
Creates an instance of the RenderObject class that this
RenderObjectWidget represents, using the configuration described by this
RenderObjectWidget.
override
-
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
-
didUnmountRenderObject(
covariant RenderObject renderObject) → void -
A render object previously associated with this widget has been removed
from the tree. The given RenderObject will be of the same type as
returned by this object's createRenderObject.
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
-
updateRenderObject(
BuildContext context, covariant RenderCustomSingleChildLayoutBox renderObject) → void -
Copies the configuration described by this RenderObjectWidget to the
given RenderObject, which will be of the same type as returned by this
object's createRenderObject.
override
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited