NavigationToolbar class
NavigationToolbar is a layout helper to position 3 widgets or groups of widgets along a horizontal axis that's sensible for an application's navigation bar such as in Material Design and in iOS.
The leading and trailing widgets occupy the edges of the widget with reasonable size constraints while the middle widget occupies the remaining space in either a center aligned or start aligned fashion.
Either directly use the themed app bars such as the Material AppBar or the iOS CupertinoNavigationBar or wrap this widget with more theming specifications for your own custom app bar.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- NavigationToolbar
Constructors
-
Creates a widget that lays out its children in a manner suitable for a
toolbar.
const
Properties
- centerMiddle → bool
-
Whether to align the middle widget to the center of this widget or
next to the leading widget when false.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- leading → Widget?
-
Widget to place at the start of the horizontal toolbar.
final
- middle → Widget?
-
Widget to place in the middle of the horizontal toolbar, occupying
as much remaining space as possible.
final
- middleSpacing → double
-
The spacing around the middle widget on horizontal axis.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- trailing → Widget?
-
Widget to place at the end of the horizontal toolbar.
final
Methods
-
build(
BuildContext context) → Widget -
Describes the part of the user interface represented by this widget.
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}) → 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
Constants
- kMiddleSpacing → const double
- The default spacing around the middle widget in dp.