PreferredSizeWidget class

An interface for widgets that can return the size this widget would prefer if it were otherwise unconstrained.

There are a few cases, notably AppBar and TabBar, where it would be undesirable for the widget to constrain its own size but where the widget needs to expose a preferred or "default" size. For example a primary Scaffold sets its app bar height to the app bar's preferred height plus the height of the system status bar.

Use PreferredSize to give a preferred size to an arbitrary widget.

Implements
Implemented by

Constructors

PreferredSizeWidget()

Properties

preferredSize Size
The size this widget would prefer if it were otherwise unconstrained. [...]
read-only
hashCode int
The hash code for this object. [...]
read-only, inherited
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

createElement() Element
Inflates this configuration to a concrete instance. [...]
@protected, inherited
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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 toStringDeep. [...]
inherited
toString() String
Returns 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

Operators

operator ==(dynamic other) bool
The equality operator. [...]
inherited