Observer class

A StatelessObserverWidget that delegate its build method to builder.

See also:

Inheritance
Implemented types

Constructors

Observer({Key key, @required WidgetBuilder builder, String name})

Properties

builder WidgetBuilder
Called to obtain the child widget. [...]
final
debugConstructingStackFrame String
The stack frame pointing to the source that constructed this instance.
final
hashCode int
The hash code for this object. [...]
@nonVirtual, 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

build(BuildContext context) Widget
Describes the part of the user interface represented by this widget. [...]
override
createElement() StatelessObserverElement
Creates a StatelessElement to manage this widget's location in the tree. [...]
inherited
createReaction(dynamic onInvalidate(), {dynamic onError(Object, Reaction)}) Reaction
A convenience method used for testing.
@visibleForTesting, 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
getContext() ReactiveContext
The context within which its reaction should be run. It is the mainContext in most cases.
inherited
getName() String
An identifiable name that can be overriden for debugging.
override
log(String msg) → void
Convenience method to output console messages as debugging output. Logging usually happens when some internal error needs to be surfaced to the user.
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 DiagnosticsNode.toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.info}) 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 ==(Object other) bool
The equality operator. [...]
@nonVirtual, inherited

Static Methods

debugFindConstructingStackFrame([StackTrace stackTrace]) String
Finds the first non-constructor frame in the stack trace. [...]
@visibleForTesting