NormalizedOverflowBox class
A widget that imposes different constraints on its child than it gets from its parent, possibly allowing the child to overflow the parent.
A NormalizedOverflowBox is similar to an OverflowBox. The difference is that an OverflowBox may throw errors if it gets constraints which are incompatible with its own constraints. For example, if an OverflowBox is inside a container with maxWidth 100, and its own minWidth is 150, it will throw:
The following assertion was thrown during performLayout():
BoxConstraints has non-normalized width constraints.
However, the NormalizedOverflowBox will just make sure maxWidth is also 150, and throw no errors. In other words, a NormalizedOverflowBox is safer to use. In my opinion, NormalizedOverflowBox has the behavior OverflowBox should have.
See also:
- RenderConstrainedOverflowBox for details about how OverflowBox is rendered.
- SizedOverflowBox, a widget that is a specific size but passes its original constraints through to its child, which may then overflow.
- ConstrainedBox, a widget that imposes additional constraints on its child.
- UnconstrainedBox, a container that tries to let its child draw without constraints.
- SizedBox, a box with a specified size.
- The catalog of layout widgets.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- RenderObjectWidget
- SingleChildRenderObjectWidget
- NormalizedOverflowBox
Constructors
- NormalizedOverflowBox({Key? key, AlignmentGeometry alignment = Alignment.center, double? minWidth, double? maxWidth, double? minHeight, double? maxHeight, Widget? child})
-
Creates a widget that lets its child overflow itself,
but prevents invalid constraints.
const
Properties
- alignment → AlignmentGeometry
-
How to align the child.
final
- child → Widget?
-
The widget below this widget in the tree.
finalinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- maxHeight → double?
-
The maximum height constraint to give the child. Set this to null (the
default) to use the constraint from the parent instead.
final
- maxWidth → double?
-
The maximum width constraint to give the child. Set this to null (the
default) to use the constraint from the parent instead.
final
- minHeight → double?
-
The minimum height constraint to give the child. Set this to null (the
default) to use the constraint from the parent instead.
final
- minWidth → double?
-
The minimum width constraint to give the child. Set this to null (the
default) to use the constraint from the parent instead.
final
- 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) → RenderConstrainedNormalizedOverflowBox -
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.
override
-
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}) → 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 RenderConstrainedNormalizedOverflowBox 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